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<li id="toc-Series_hybrid" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Series_hybrid"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Series hybrid</span> </div> </a> <ul id="toc-Series_hybrid-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Electric_traction_motors" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Electric_traction_motors"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3</span> <span>Electric traction motors</span> </div> </a> <ul id="toc-Electric_traction_motors-sublist" class="vector-toc-list"> <li id="toc-In_detail" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#In_detail"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.1</span> <span>In detail</span> </div> </a> <ul id="toc-In_detail-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-In-wheel_motors" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#In-wheel_motors"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.2</span> <span>In-wheel motors</span> </div> </a> <ul id="toc-In-wheel_motors-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Power-split_or_series-parallel_hybrid" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Power-split_or_series-parallel_hybrid"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.4</span> <span>Power-split or series-parallel hybrid</span> </div> </a> <ul id="toc-Power-split_or_series-parallel_hybrid-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Types_by_degree_of_hybridization" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Types_by_degree_of_hybridization"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Types by degree of hybridization</span> </div> </a> <button aria-controls="toc-Types_by_degree_of_hybridization-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Types by degree of hybridization subsection</span> </button> <ul id="toc-Types_by_degree_of_hybridization-sublist" class="vector-toc-list"> <li id="toc-Dual_hybrids" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Dual_hybrids"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Dual hybrids</span> </div> </a> <ul id="toc-Dual_hybrids-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Micro_hybrids" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Micro_hybrids"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Micro hybrids</span> </div> </a> <ul id="toc-Micro_hybrids-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Mild_hybrids" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Mild_hybrids"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.3</span> <span>Mild hybrids</span> </div> </a> <ul id="toc-Mild_hybrids-sublist" class="vector-toc-list"> <li id="toc-Dual_mild_hybrids" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Dual_mild_hybrids"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.3.1</span> <span>Dual mild hybrids</span> </div> </a> <ul id="toc-Dual_mild_hybrids-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Full_hybrids" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Full_hybrids"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.4</span> <span>Full hybrids</span> </div> </a> <ul id="toc-Full_hybrids-sublist" class="vector-toc-list"> <li id="toc-Dual_full_hybrids" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Dual_full_hybrids"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.4.1</span> <span>Dual full hybrids</span> </div> </a> <ul id="toc-Dual_full_hybrids-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Plug-in_hybrid" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Plug-in_hybrid"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.5</span> <span>Plug-in hybrid</span> </div> </a> <ul id="toc-Plug-in_hybrid-sublist" class="vector-toc-list"> <li id="toc-Dual_plug-in_hybrids" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Dual_plug-in_hybrids"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.5.1</span> <span>Dual plug-in hybrids</span> </div> </a> <ul id="toc-Dual_plug-in_hybrids-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </li> <li id="toc-Types_by_power_source" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Types_by_power_source"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Types by power source</span> </div> </a> <button aria-controls="toc-Types_by_power_source-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Types by power source subsection</span> </button> <ul id="toc-Types_by_power_source-sublist" class="vector-toc-list"> <li id="toc-Electric-internal_combustion_engine_hybrid" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Electric-internal_combustion_engine_hybrid"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Electric-internal combustion engine hybrid</span> </div> </a> <ul id="toc-Electric-internal_combustion_engine_hybrid-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Electric-fuel_cell_hybrid" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Electric-fuel_cell_hybrid"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2</span> <span>Electric-fuel cell hybrid</span> </div> </a> <ul id="toc-Electric-fuel_cell_hybrid-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Internal_combustion_engine-hydraulic_hybrid" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Internal_combustion_engine-hydraulic_hybrid"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.3</span> <span>Internal combustion engine-hydraulic hybrid</span> </div> </a> <ul id="toc-Internal_combustion_engine-hydraulic_hybrid-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Internal_combustion_engine-pneumatic" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Internal_combustion_engine-pneumatic"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.4</span> <span>Internal combustion engine-pneumatic</span> </div> </a> <ul id="toc-Internal_combustion_engine-pneumatic-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Human_power-environmental_power" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Human_power-environmental_power"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.5</span> <span>Human power-environmental power</span> </div> </a> <ul id="toc-Human_power-environmental_power-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Hybrid_vehicle_operation_modes" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Hybrid_vehicle_operation_modes"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Hybrid vehicle operation modes</span> </div> </a> <ul id="toc-Hybrid_vehicle_operation_modes-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Hybrid_drivetrain_topology" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Hybrid_drivetrain_topology"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Hybrid drivetrain topology</span> </div> </a> <ul id="toc-Hybrid_drivetrain_topology-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Aftermarket_options" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Aftermarket_options"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Aftermarket options</span> </div> </a> <ul id="toc-Aftermarket_options-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">10</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" title="Table of Contents" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" 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data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Systems vehicles with multiple power sources use to transmit power to the wheels</div> <p><b>Hybrid vehicle drivetrains</b> transmit power to the driving wheels for <a href="/wiki/Hybrid_vehicle" title="Hybrid vehicle">hybrid vehicles</a>. A hybrid vehicle has multiple forms of motive power, and can come in many configurations. For example, a hybrid may receive its energy by burning gasoline, but switch between an <a href="/wiki/Electric_motor" title="Electric motor">electric motor</a> and a <a href="/wiki/Internal_combustion_engine" title="Internal combustion engine">combustion engine</a>. </p><p>A typical <a href="/wiki/Powertrain" title="Powertrain">powertrain</a> includes all of the components used to transform stored <a href="/wiki/Potential_energy" title="Potential energy">potential energy</a>. Powertrains may either use chemical, solar, nuclear or kinetic energy for propulsion. The oldest example is the steam locomotive. Modern examples include <a href="/wiki/Electric_bicycle" title="Electric bicycle">electric bicycles</a> and <a href="/wiki/Hybrid_electric_vehicle" title="Hybrid electric vehicle">hybrid electric vehicles</a>, which generally combine a <a href="/wiki/Electric-vehicle_battery" class="mw-redirect" title="Electric-vehicle battery">battery</a> (or <a href="/wiki/Supercapacitor" title="Supercapacitor">supercapacitor</a>) supplemented by an <a href="/wiki/Internal_combustion_engine" title="Internal combustion engine">internal combustion engine</a> (ICE) that can either recharge the batteries or power the vehicle. Other hybrid powertrains can use <a href="/wiki/Flywheel" title="Flywheel">flywheels</a> to store energy. </p><p>Among different types of hybrid vehicles, only the electric/ICE type is commercially available as of 2017. One variety operated <a href="/wiki/In_parallel" class="mw-redirect" title="In parallel">in parallel</a> to provide power from both motors simultaneously. Another operated <a href="/wiki/In_series" class="mw-redirect" title="In series">in series</a> with one source exclusively providing the power and the second providing electricity. Either source may provide the primary motive force, with the other augmenting the primary. </p><p>Other combinations offer efficiency gains from superior energy management and regeneration that are offset by cost, complexity and battery limitations. Combustion-electric (CE) hybrids have battery packs with far larger capacity than a combustion-only vehicle. A combustion-electric hybrid has batteries that are light that offer higher energy density and are far more costly. ICEs require only a battery large enough to operate the electrical system and ignite the engine.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <style data-mw-deduplicate="TemplateStyles:r886046785">.mw-parser-output .toclimit-2 .toclevel-1 ul,.mw-parser-output .toclimit-3 .toclevel-2 ul,.mw-parser-output .toclimit-4 .toclevel-3 ul,.mw-parser-output .toclimit-5 .toclevel-4 ul,.mw-parser-output .toclimit-6 .toclevel-5 ul,.mw-parser-output .toclimit-7 .toclevel-6 ul{display:none}</style><div class="toclimit-3"><meta property="mw:PageProp/toc" /></div> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Electrical vehicles have a long history combining internal combustion and electrical transmission –  as in a <a href="/wiki/Diesel%E2%80%93electric_transmission" class="mw-redirect" title="Diesel–electric transmission">diesel–electric</a> power-train –  although they have mostly been used for rail <a href="/wiki/Locomotive" title="Locomotive">locomotives</a>. A diesel–electric powertrain fails the strict definition of hybrid because the electric drive transmission directly replaces the mechanical transmission rather than being a supplementary source of motive power. </p><p>One of the earliest forms of hybrid land vehicle was the 'trackless' <a href="/wiki/Trolleybus" title="Trolleybus">trolleybus</a> experiment in The United States (New Jersey) that ran from 1935 to 1948, which normally used traction current delivered by wire. The trolleybus was fitted with an <a href="/wiki/Internal_combustion_engine" title="Internal combustion engine">internal combustion engine</a> to power the mechanical drivetrain directly, not to generate electricity for the traction motor. This enabled the vehicle to be used for revenue service where there was no contact wire. </p><p>Since the 1990s trolleybus hybrids have been introduced with small power plants to provide a low speed capability for emergency and maintenance but not to support general revenue service. </p> <div class="mw-heading mw-heading2"><h2 id="Types_by_design">Types by design</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=2" title="Edit section: Types by design"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Parallel_hybrid">Parallel hybrid</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=3" title="Edit section: Parallel hybrid"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Hybridpar.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Hybridpar.svg/220px-Hybridpar.svg.png" decoding="async" width="220" height="122" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Hybridpar.svg/330px-Hybridpar.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Hybridpar.svg/440px-Hybridpar.svg.png 2x" data-file-width="755" data-file-height="420" /></a><figcaption>Structure of a parallel hybrid electric vehicle. The grey squares represent <a href="/wiki/Differential_gear" class="mw-redirect" title="Differential gear">differential gears</a>.</figcaption></figure> <p>Parallel hybrid systems have both an internal combustion engine and an electric motor that can both individually drive the car or both coupled up jointly giving drive. This is the most common hybrid system as of 2016. </p><p>If they are joined at an axis (in parallel)<i>,</i> the speeds at this axis must be identical and the supplied <a href="/wiki/Torques" class="mw-redirect" title="Torques">torques</a> will add together (most electric bicycles are of this type). When only one of the two sources is in use, the other must be connected via a one-way <a href="/wiki/Clutch" title="Clutch">clutch</a> or <a href="/wiki/Freewheel" title="Freewheel">freewheel</a> so it can rotate freely. </p><p>With cars the two sources may be applied to the same shaft (for example with the electric motor connected between the engine and transmission), turning at equal speeds and the torques adding up with the electric motor adding or subtracting torque to the system as necessary. (The first two generations of <a href="/wiki/Honda_Insight" title="Honda Insight">Honda Insight</a> use this system.) </p><p><a href="/wiki/Parallel_Hybrid" class="mw-redirect" title="Parallel Hybrid">Parallel hybrids</a> can be further categorized by the balance between the different motors are at providing motive power: the ICE may be dominant (engaging the electric motor only in specific circumstances) or vice versa; while in others can run on the electric system alone but because current parallel hybrids are unable to provide electric-only or internal combustion-only modes they are often categorized as <b>mild hybrids</b> (see below). </p><p>Parallel hybrids rely more on <a href="/wiki/Regenerative_braking" title="Regenerative braking">regenerative braking</a> and the ICE can also act as a generator for supplemental recharging. This makes them more efficient in urban 'stop-and-go' conditions. They use a smaller battery pack than other hybrids. <a href="/wiki/Honda" title="Honda">Honda</a>'s early Insight, <a href="/wiki/Honda_Civic_Hybrid" class="mw-redirect" title="Honda Civic Hybrid">Civic</a>, and <a href="/wiki/Honda_Accord_Hybrid" class="mw-redirect" title="Honda Accord Hybrid">Accord</a> hybrids using <a href="/wiki/Integrated_Motor_Assist" title="Integrated Motor Assist">IMA</a> are examples of production parallel hybrids.<sup id="cite_ref-UCSHbrid_2-0" class="reference"><a href="#cite_note-UCSHbrid-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> General Motors <a href="/wiki/Parallel_Hybrid_Truck" class="mw-redirect" title="Parallel Hybrid Truck">Parallel Hybrid Truck</a> (PHT) and <a href="/wiki/BAS_Hybrid" class="mw-redirect" title="BAS Hybrid">BAS Hybrids</a> such as the <a href="/wiki/Saturn_Vue" title="Saturn Vue">Saturn Vue</a> and <a href="/wiki/Saturn_Aura" title="Saturn Aura">Aura</a> Greenline and <a href="/wiki/Chevrolet_Malibu" title="Chevrolet Malibu">Chevrolet Malibu</a> hybrids also employ a parallel hybrid architecture. </p> <div class="mw-heading mw-heading4"><h4 id="Through_the_Road_(TTR)_hybrid"><span id="Through_the_Road_.28TTR.29_hybrid"></span>Through the Road (TTR) hybrid</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=4" title="Edit section: Through the Road (TTR) hybrid"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>An alternative parallel hybrid is the "through the road" type.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> In this system a conventional drivetrain powers one axle, with an electric motor or motors driving another. This arrangement was used by the earliest 'off track' trolleybuses. It in effect provides a complete backup power train. In modern motors batteries can be recharged through regenerative braking or by loading the electrically driven wheels during cruise. This allows a simpler approach to power-management. This layout also has the advantage of providing four-wheel-drive in some conditions. (An example of this principle is a bicycle fitted with a front hub motor, which assists the cyclist's pedal power at the rear wheel.) Vehicles of this type include the <a href="/wiki/Audi_hybrid_vehicles#Audi_100_Duo_II" title="Audi hybrid vehicles">Audi 100 Duo II</a> and <a href="/wiki/Subaru_VIZIV" title="Subaru VIZIV">Subaru VIZIV</a> concept cars, <a href="/wiki/Peugeot_3008#Hybrid_version" title="Peugeot 3008">Peugeot 3008</a>, <a href="/wiki/Peugeot_508" title="Peugeot 508">Peugeot 508</a>, <a href="/wiki/Peugeot_508#508_RXH" title="Peugeot 508">508 RXH</a>, <a href="/wiki/Citro%C3%ABn_DS5" class="mw-redirect" title="Citroën DS5">Citroën DS5</a> (all using <a href="/wiki/Groupe_PSA" class="mw-redirect" title="Groupe PSA">PSA</a>'s <a href="/wiki/PSA_HYbrid4" title="PSA HYbrid4">HYbrid4</a> system), the <a href="/wiki/Volvo_V60#V60_Plug-in_Hybrid" title="Volvo V60">Volvo V60 plug-in hybrid</a>, the <a href="/wiki/BMW_2_Series_Active_Tourer" title="BMW 2 Series Active Tourer">BMW 2 Series Active Tourer</a>, <a href="/wiki/BMW_i8" title="BMW i8">BMW i8</a> and the <a href="/wiki/Honda_NSX_(second_generation)" title="Honda NSX (second generation)">second generation Honda NSX</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Series_hybrid">Series hybrid</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=5" title="Edit section: Series hybrid"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Hybridpeak.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/03/Hybridpeak.svg/220px-Hybridpeak.svg.png" decoding="async" width="220" height="85" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/03/Hybridpeak.svg/330px-Hybridpeak.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/03/Hybridpeak.svg/440px-Hybridpeak.svg.png 2x" data-file-width="570" data-file-height="220" /></a><figcaption>Structure of a series-hybrid vehicle. The grey square represents a differential gear. An alternative arrangement (not shown) is to have electric motors at two or four wheels.</figcaption></figure> <p>Series hybrids are also referred to as <a href="/wiki/Range_extender_(vehicle)" class="mw-redirect" title="Range extender (vehicle)">extended-range electric vehicles</a> (EREV)<sup id="cite_ref-R1_5-0" class="reference"><a href="#cite_note-R1-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> or range-extended electric vehicles (REEV), or electric vehicle with extended range (EVER). All series hybrids are EREV, REEV or EVER, but not all EREV, REEV or EVER are series hybrids. Series hybrids with particular characteristics are classified as range-extended battery-electric vehicle (BEVx) by the <a href="/wiki/California_Air_Resources_Board" title="California Air Resources Board">California Air Resources Board</a>.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p><p>Electric transmissions were invented by 1903. Mechanical transmissions involve costs via their weight, bulk, noise, cost, complexity and drain on engine power with every gear-change, affecting both manual and automatic systems. Unlike ICEs, electric motors typically do not require a transmission. </p><p>Compared to parallel hybrids, the mechanical transmission between the engine and wheels is discarded. The engine instead acts as an electric generator, attached to the battery via cable. The linkage is engine to battery to electric motor to wheels. In some cases, the generator also directly links to the motor. </p><p>This serial arrangement is common in <a href="/wiki/Diesel%E2%80%93electric_transmission" class="mw-redirect" title="Diesel–electric transmission">diesel–electric</a> <a href="/wiki/Locomotive" title="Locomotive">locomotives</a> and ships (the Russian river ship <a href="/wiki/Vandal_(tanker)" title="Vandal (tanker)">Vandal</a>, launched in 1903, was the world's first <a href="/wiki/Diesel_engine" title="Diesel engine">diesel-powered</a> and <a href="/wiki/Diesel%E2%80%93electric_transmission" class="mw-redirect" title="Diesel–electric transmission">diesel–electric</a> powered vessel). <a href="/wiki/Ferdinand_Porsche" title="Ferdinand Porsche">Ferdinand Porsche</a> successfully used this arrangement in the early 20th century in racing cars, including the <a href="/wiki/Lohner%E2%80%93Porsche" title="Lohner–Porsche">Lohner–Porsche Mixte Hybrid</a>. Porsche named the system System Mixte, which had a <a href="/wiki/Wheel_hub_motor" title="Wheel hub motor">wheel hub motor</a> arrangement, with a motor in each of the two front wheels, setting speed records. </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Chevrolet_Volt_charging_WAS_2011_833.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/83/Chevrolet_Volt_charging_WAS_2011_833.jpg/220px-Chevrolet_Volt_charging_WAS_2011_833.jpg" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/83/Chevrolet_Volt_charging_WAS_2011_833.jpg/330px-Chevrolet_Volt_charging_WAS_2011_833.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/83/Chevrolet_Volt_charging_WAS_2011_833.jpg/440px-Chevrolet_Volt_charging_WAS_2011_833.jpg 2x" data-file-width="1200" data-file-height="800" /></a><figcaption>The <a href="/wiki/Chevrolet_Volt" title="Chevrolet Volt">Chevrolet Volt</a> operates primarily as a series hybrid.</figcaption></figure> <p>This approach isolates the engine from demand, allowing it to operate only at its most efficient speed. The engine can be much smaller, since it does not have to accommodate high speed/acceleration. Traction motors are typically powered only by the battery, which can also be charged from external sources. </p><p><a href="/wiki/Nissan" title="Nissan">Nissan</a>'s e-Power line (<a href="/wiki/Nissan_Note#2017_model_year_update_–_e-Power" title="Nissan Note">Note</a>,<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Nissan_Serena#C27" title="Nissan Serena">Serena</a>,<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Nissan_Kicks#Kicks_e-Power" title="Nissan Kicks">Kicks</a>,<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Nissan_X-Trail#T33" title="Nissan X-Trail">X-Trail</a>,<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> and <a href="/wiki/Nissan_Qashqai#J12" title="Nissan Qashqai">Qashqai</a>)<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> using the engine to drive a generator and the EM57 traction motor.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Mazda" title="Mazda">Mazda</a>'s <a href="/wiki/Mazda_MX-30" title="Mazda MX-30">MX-30</a>, is optionally equipped with a range extender.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> <a href="/wiki/BMW_i3" title="BMW i3">BMW's i3</a> attached the generator only to the battery. ThunderVolt hybrid transit buses<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> and transit buses fitted with <a href="/wiki/BAE_Systems_Electronic_Systems" title="BAE Systems Electronic Systems">BAE Systems</a> (formerly <a href="/wiki/Lockheed_Martin" title="Lockheed Martin">Lockheed Martin</a>) HybriDrive powertrains are also serial hybrids.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Electric_traction_motors">Electric traction motors</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=6" title="Edit section: Electric traction motors"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Electric motors are more efficient than ICEs, with high <a href="/wiki/Power-to-weight_ratio" title="Power-to-weight ratio">power-to-weight ratios</a> providing torque over a wide speed range. ICEs are most efficient when turning at a constant speed. </p><p>ICEs can run optimally when turning a generator. Series-hybrid systems offer smoother acceleration by avoiding gear changes. Series-hybrids incorporate: </p> <ul><li>Electric traction only – using only electric motors to turn the wheels.</li> <li>ICE – turns only a generator.</li> <li>Generator – turned by the ICE to generate electricity and start the engine.</li> <li>Battery – energy buffer.</li> <li>Regenerative braking – The drive motor becomes a generator and recovers energy by converting kinetic to electrical energy, also slowing the vehicle and preventing thermal losses.</li></ul> <p>In addition: </p> <ul><li>May be plugged into the grid to recharge the battery.</li> <li><a href="/wiki/Supercapacitor" title="Supercapacitor">Supercapacitors</a> assist the battery and recover most energy from braking.</li></ul> <div class="mw-heading mw-heading4"><h4 id="In_detail">In detail</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=7" title="Edit section: In detail"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The electric motor may be entirely fed by electricity from the battery or via the generator turned by the ICE, or both. Such a vehicle conceptually resembles a <a href="/wiki/Diesel%E2%80%93electric_transmission" class="mw-redirect" title="Diesel–electric transmission">diesel–electric</a> <a href="/wiki/Locomotive" title="Locomotive">locomotive</a> with the addition of a battery that may power the vehicle without running the ICE and acting as an energy buffer that is used to accelerate and achieve greater speed; the generator may simultaneously charge the battery and power the electric motor that moves the vehicle. </p><p>When the vehicle is stopped the ICE is switched off without idling, while the battery provides whatever power is needed at rest. Vehicles at traffic lights, or in slow moving stop-start traffic need not burn fuel when stationary or moving slowly, reducing emissions. </p><p>Series-hybrids can be fitted with a <a href="/wiki/Supercapacitor" title="Supercapacitor">supercapacitor</a> or a <a href="/wiki/Flywheel" title="Flywheel">flywheel</a> to store <a href="/wiki/Regenerative_braking" title="Regenerative braking">regenerative braking</a> energy, which can improve efficiency by recovering energy otherwise lost as heat through the braking system. Because a series-hybrid has no mechanical link between the ICE and the wheels, the engine can run at a constant and efficient rate regardless of vehicle speed, achieving higher efficiency (37%, rather than the ICE average of 20%<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup>) and at low or mixed speeds this could result in ~50% increase in overall efficiency (19% vs 29%). </p><p><a href="/wiki/Lotus_Cars" title="Lotus Cars">Lotus</a> offered an engine/generator set design that runs at two speeds, giving 15 kW of electrical power at 1,500 rpm and 35 kW at 3,500 rpm via the integrated electrical generator,<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> used in the Nissan concept <a href="/wiki/Infiniti_Emerg-e" title="Infiniti Emerg-e">Infiniti Emerg-e</a>. </p><p>This operating profile allows greater scope for alternative engine designs, such as a <a href="/wiki/Microturbines" class="mw-redirect" title="Microturbines">microturbine</a>,<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Atkinson_cycle#Rotary_Atkinson-cycle_engine" title="Atkinson cycle">rotary Atkinson cycle engine</a> or <a href="/wiki/Linear_Combustion_Engine" class="mw-redirect" title="Linear Combustion Engine">linear combustion engine</a>.<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> </p><p>The ICE is matched to the electric engine by comparing the output rates at <a href="/wiki/Cruising_speed" class="mw-redirect" title="Cruising speed">cruising speed</a>. Generally, output rates for combustion engines are provided for instantaneous (peak) output rates,<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> but in practice these can't be used. </p><p>The use of an <a href="/wiki/Wheel_hub_motor" title="Wheel hub motor">electric motor driving a wheel directly</a> eliminates the conventional mechanical transmission elements: gearbox, transmission shafts and differential, and can sometimes eliminate <a href="/wiki/Constant-velocity_joint" title="Constant-velocity joint">flexible couplings</a>. </p><p>In 1997, Toyota released the first series-hybrid bus sold in Japan.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> <a href="/wiki/DesignLine_Corporation" class="mw-redirect" title="DesignLine Corporation">Designline International</a> of Ashburton, New Zealand produces city buses with a <a href="/wiki/Microturbine#Microturbines" title="Microturbine">microturbine</a> powered series-hybrid system. <a href="/wiki/Wrightbus" title="Wrightbus">Wrightbus</a> produces series hybrid buses including the <a href="/wiki/Wright_Gemini_2" title="Wright Gemini 2">Gemini 2</a> and <a href="/wiki/New_Routemaster" title="New Routemaster">New Routemaster</a>. <a href="/wiki/Supercapacitors" class="mw-redirect" title="Supercapacitors">Supercapacitors</a> combined with a <a href="/wiki/Lithium_ion" class="mw-redirect" title="Lithium ion">lithium ion</a> battery bank have been used by <a href="/wiki/AFS_Trinity" title="AFS Trinity">AFS Trinity</a> in a converted Saturn Vue SUV vehicle. Using <a href="/wiki/Supercapacitors" class="mw-redirect" title="Supercapacitors">supercapacitors</a> they claim up to 150 mpg in a series-hybrid arrangement.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> </p><p>Well known automotive series hybrid models include the variant of the <a href="/wiki/BMW_i3" title="BMW i3">BMW i3</a> that is equipped with a range extender. Another example of a series hybrid automobile is the <a href="/wiki/Fisker_Karma" title="Fisker Karma">Fisker Karma</a>. The <a href="/wiki/Chevrolet_Volt" title="Chevrolet Volt">Chevrolet Volt</a> is almost a series hybrid, but also includes a mechanical link from the engine to the wheels above 70 mph.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> </p><p>Series-hybrids have been taken up by the aircraft industry. The DA36 E-Star, an aircraft designed by <a href="/wiki/Siemens" title="Siemens">Siemens</a>, <a href="/wiki/Diamond_Aircraft_Industries" title="Diamond Aircraft Industries">Diamond Aircraft</a> and <a href="/wiki/EADS" class="mw-redirect" title="EADS">EADS</a>, employs a <a href="/wiki/Series_hybrid" class="mw-redirect" title="Series hybrid">series hybrid</a> powertrain with the propeller turned by a Siemens 70 kW (94 hp) electric motor. A power sapping propeller speed reduction unit is eliminated. The aim is to reduce fuel consumption and emissions by up to 25 percent. An onboard 40 hp (30 kW) <a href="/wiki/Austro_Engine" title="Austro Engine">Austro Engine</a> Wankel rotary engine and generator provides the electricity. </p><p>The Wankel was chosen because of its small size, low weight and great power to weight ratio. (Wankel engines also run efficiently at a constant speed of approximately 2,000 RPM which is suited to generator operation. Keeping to a constant/narrow band offsets many of the perceived disadvantages of the Wankel engine in automotive applications.<sup id="cite_ref-telegraph.co.uk_26-0" class="reference"><a href="#cite_note-telegraph.co.uk-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup>) </p><p>The electric propeller motor uses electricity stored in batteries, with the engines not operating, to take off and climb reducing sound emissions. The powertrain reduces the weight of the plane by 100 kilos relative to its predecessor. The DA36 E-Star first flew in June 2013, making this the first ever flight of a series hybrid powertrain. Diamond Aircraft state that the technology is scalable to a 100-seat aircraft.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="In-wheel_motors">In-wheel motors</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=8" title="Edit section: In-wheel motors"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>If the motors are attached to the vehicle body, <a href="/wiki/Constant-velocity_joint" title="Constant-velocity joint">flexible couplings</a> are required but not if the traction motors are <a href="/wiki/Wheel_motor" class="mw-redirect" title="Wheel motor">integrated into the wheels</a>. One disadvantage is that the <a href="/wiki/Unsprung_mass" title="Unsprung mass">unsprung mass</a> increases and suspension responsiveness decreases, which impacts ride and potentially safety. However the impact should be minimal as electric motors in wheel hubs such as <a href="/wiki/Hi-Pa_Drive" title="Hi-Pa Drive">Hi-Pa Drive</a>, may be very small and light having exceptionally high <a href="/wiki/Power-to-weight_ratio" title="Power-to-weight ratio">power-to-weight ratios</a> and braking mechanisms can be lighter as the wheel motors brake the vehicle. </p><p>Advantages of individual wheel motors include simplified <a href="/wiki/Traction_control_system" title="Traction control system">traction control</a>, <a href="/wiki/All_wheel_drive" class="mw-redirect" title="All wheel drive">all wheel drive</a> if required and a lower floor (useful for buses and other specialised vehicles (some <a href="/wiki/Heavy_Expanded_Mobility_Tactical_Truck" title="Heavy Expanded Mobility Tactical Truck">8x8 all-wheel drive military vehicles</a> use individual wheel motors). <a href="/wiki/Diesel%E2%80%93electric_transmission" class="mw-redirect" title="Diesel–electric transmission">Diesel–electric</a> <a href="/wiki/Locomotive" title="Locomotive">locomotives</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20150901062917/http://www.railway-technical.com/diesel.shtml">have used this concept</a> (individual motors driving axles of each pair of wheels) for 70 years.<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup><sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citing_sources#What_information_to_include" title="Wikipedia:Citing sources"><span title="A complete citation is needed. (April 2013)">full citation needed</span></a></i>]</sup> </p><p>Other measures include lightweight aluminium wheels to reduce the <a href="/wiki/Unsprung_mass" title="Unsprung mass">unsprung mass</a> of the wheel assembly; vehicle designs may be optimized to lower the centre of gravity by locating heavier elements (including battery) at floor level; In a typical road vehicle the power-transmission setup may be smaller and lighter than the equivalent conventional mechanical power-transmission setup, liberating space; the combustion generator set only requires cables to the driving electric motors, increasing flexibility in major component layout spread across a vehicle giving superior weight distribution and maximizing vehicle cabin space and opening up the possibility of superior vehicle designs exploiting this flexibility. </p> <div class="mw-heading mw-heading3"><h3 id="Power-split_or_series-parallel_hybrid">Power-split or series-parallel hybrid</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=9" title="Edit section: Power-split or series-parallel hybrid"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Hybridcombined.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Hybridcombined.svg/220px-Hybridcombined.svg.png" decoding="async" width="220" height="101" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Hybridcombined.svg/330px-Hybridcombined.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Hybridcombined.svg/440px-Hybridcombined.svg.png 2x" data-file-width="1201" data-file-height="549" /></a><figcaption>Structure of a combined hybrid electric vehicle</figcaption></figure> <p><b>Power-split hybrid</b> or <b>series-parallel hybrid</b> are parallel hybrids that incorporate power-split devices, allowing for power paths from the ICE to the wheels that can be either mechanical or electrical. The main principle is to decouple the power supplied by the primary source from the power demanded by the driver. </p><p>ICE torque output is minimal at lower RPMs and conventional vehicles increase engine size to meet market requirements for acceptable initial acceleration. The larger engine has more power than needed for cruising. Electric motors produce full torque at standstill and are well-suited to complement ICE torque deficiency at low RPMs. In a power-split hybrid, a smaller, less flexible, and more efficient engine can be used. The conventional <a href="/wiki/Otto_cycle" title="Otto cycle">Otto cycle</a> (higher power density, more low-RPM torque, lower <a href="/wiki/Fuel_efficiency" title="Fuel efficiency">fuel efficiency</a>) is often modified to an <a href="/wiki/Atkinson_cycle" title="Atkinson cycle">Atkinson cycle</a> or <a href="/wiki/Miller_cycle" title="Miller cycle">Miller cycle</a> (lower power density, less low-rpm torque, higher fuel efficiency; sometimes called an Atkinson-Miller cycle). The smaller engine, using a more efficient cycle and often operating in the favorable region of the <a href="/wiki/Brake_specific_fuel_consumption" class="mw-redirect" title="Brake specific fuel consumption">brake specific fuel consumption</a> map, significantly contributes to the higher overall efficiency of the vehicle. </p><p>Interesting variations of the simple design (pictured at right) found, for example, in the well-known <a href="/wiki/Toyota_Prius" title="Toyota Prius">Toyota Prius</a> are the: </p> <ul><li>Fixed-ratio second <a href="/wiki/Epicyclic_gearing" title="Epicyclic gearing">planetary gearset</a> as used in the <a href="/wiki/Lexus_RX" title="Lexus RX">Lexus RX400h</a> and <a href="/wiki/Toyota_Highlander" title="Toyota Highlander">Toyota Highlander Hybrid</a>. This allows for a motor with less torque but higher power (and higher maximum rotary speed), i.e. higher power density</li> <li><a href="/wiki/Ravigneaux_planetary_gearset" title="Ravigneaux planetary gearset">Ravigneaux</a><sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup>-type planetary gear (planetary gear with 4 shafts instead of 3) and two clutches as used in the <a href="/wiki/Lexus_GS" title="Lexus GS">Lexus GS450h</a>. By switching the clutches, the gear ratio from MG2 (the traction motor) to the wheel shaft is switched, either for higher torque or higher speed (up to 250 km/h / 155 mph) while sustaining better transmission efficiency. This is effectively accomplished in the Generation 3 Prius HSDs (Prius v, Prius Plug-in and Prius c), although the Generation 3 HSD has this second planetary gear set fixed at 2.5:1, rather than switching between 1:1 and 2.5:1 as the "carrier" is held fixed.</li></ul> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:2019_Toyota_Prius_(ZVW50R)_1.8_Hybrid_liftback_(2018-12-19)_01.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/61/2019_Toyota_Prius_%28ZVW50R%29_1.8_Hybrid_liftback_%282018-12-19%29_01.jpg/220px-2019_Toyota_Prius_%28ZVW50R%29_1.8_Hybrid_liftback_%282018-12-19%29_01.jpg" decoding="async" width="220" height="134" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/61/2019_Toyota_Prius_%28ZVW50R%29_1.8_Hybrid_liftback_%282018-12-19%29_01.jpg/330px-2019_Toyota_Prius_%28ZVW50R%29_1.8_Hybrid_liftback_%282018-12-19%29_01.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/61/2019_Toyota_Prius_%28ZVW50R%29_1.8_Hybrid_liftback_%282018-12-19%29_01.jpg/440px-2019_Toyota_Prius_%28ZVW50R%29_1.8_Hybrid_liftback_%282018-12-19%29_01.jpg 2x" data-file-width="3226" data-file-height="1961" /></a><figcaption>Power-splitter series-hybrid <a href="/wiki/Toyota_Prius" title="Toyota Prius">Toyota Prius</a> </figcaption></figure> <ul><li>Two additional planetary gear sets in combination with four clutches to create a <a href="/wiki/Two-Mode_Hybrid" class="mw-redirect" title="Two-Mode Hybrid">Two-Mode Hybrid</a> configuration able to operate in all-electric, blended electric and ICE, or ICE alone with four fixed gears. Examples of <a href="/wiki/Two-Mode_Hybrid" class="mw-redirect" title="Two-Mode Hybrid">Two-Mode Hybrids</a> include the <a href="/wiki/General_Motors" title="General Motors">General Motors</a> <a href="/wiki/Two-Mode_Hybrid" class="mw-redirect" title="Two-Mode Hybrid">Two-Mode Hybrid</a> full-size trucks and SUVs, the <a href="/wiki/BMW_X6" title="BMW X6">BMW X6 ActiveHybrid</a><sup id="cite_ref-an_31-0" class="reference"><a href="#cite_note-an-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> and the <a href="/wiki/Mercedes-Benz_M_Class" class="mw-redirect" title="Mercedes-Benz M Class">Mercedes ML 450 hybrid</a>.<sup id="cite_ref-an_31-1" class="reference"><a href="#cite_note-an-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup></li></ul> <p>The Toyota Hybrid System THS / <a href="/wiki/Hybrid_Synergy_Drive" title="Hybrid Synergy Drive">Hybrid Synergy Drive</a> has a single power-split device (incorporated as a single three-shaft planetary gearset) and can be classified as an Input-Split, since the power of the engine is split at the input to the transmission. This in turn makes this setup very simple in mechanical terms, but has drawbacks of its own. For example, in Generation 1 and Generation 2 HSDs maximum speed is mainly limited by the speed of the smaller electric motor (often functioning as a generator). The Generation 3 HSD separates the ICE-MG1 path from the MG2 path, each with its own, tailored gear ratio (1.1:1 and 2.5:1, respectively, for late Priuses, including the Prius c). The Generation 4 HSD eliminates the second planetary gear set, and places the electric motors on parallel axes, with a combining gear in between these axes, and transfers the combined result to the final drive differential. This is quite similar to Toyota-affiliated <a href="/wiki/Aisin_Seiki" class="mw-redirect" title="Aisin Seiki">Aisin Seiki</a>'s hybrid system, and saves significant space. </p> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Toyota_1NZ-FXE_Engine_01.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/79/Toyota_1NZ-FXE_Engine_01.JPG/220px-Toyota_1NZ-FXE_Engine_01.JPG" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/79/Toyota_1NZ-FXE_Engine_01.JPG/330px-Toyota_1NZ-FXE_Engine_01.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/79/Toyota_1NZ-FXE_Engine_01.JPG/440px-Toyota_1NZ-FXE_Engine_01.JPG 2x" data-file-width="1600" data-file-height="1069" /></a><figcaption>Early Hybrid Synergy Drive. Generation 1/Generation 2 (chained) ICE-MG1-MG2 Power Split Device HSD is shown. MG2 ratio permanently set at 1:1.</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Toyota_electronic_continuously_variable_transmission_(2010-10-16)_03.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/67/Toyota_electronic_continuously_variable_transmission_%282010-10-16%29_03.jpg/220px-Toyota_electronic_continuously_variable_transmission_%282010-10-16%29_03.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/67/Toyota_electronic_continuously_variable_transmission_%282010-10-16%29_03.jpg/330px-Toyota_electronic_continuously_variable_transmission_%282010-10-16%29_03.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/67/Toyota_electronic_continuously_variable_transmission_%282010-10-16%29_03.jpg/440px-Toyota_electronic_continuously_variable_transmission_%282010-10-16%29_03.jpg 2x" data-file-width="4000" data-file-height="3000" /></a><figcaption>Late Hybrid Synergy Drive. Generation 3 (chainless) ICE-MG1 Power Split Device/MG2 Motor Speed Reduction Device HSD is shown. MG2 ratio permanently set at 2.5:1.</figcaption></figure> <p><a href="/wiki/General_Motors" title="General Motors">General Motors</a>, <a href="/wiki/BMW" title="BMW">BMW</a>, and <a href="/wiki/DaimlerChrysler" class="mw-redirect" title="DaimlerChrysler">DaimlerChrysler</a> collaborated on a system named "Two-Mode Hybrid" as part of the <a href="/wiki/Global_Hybrid_Cooperation" title="Global Hybrid Cooperation">Global Hybrid Cooperation</a>. The technology was released in the fall of 2007 on the <a href="/wiki/Chevrolet_Tahoe" title="Chevrolet Tahoe">Chevrolet Tahoe Hybrid</a>. The system was also featured on the GMC Graphite SUV concept vehicle at the 2005 <a href="/wiki/North_American_International_Auto_Show" title="North American International Auto Show">North American International Auto Show</a> in <a href="/wiki/Detroit" title="Detroit">Detroit</a>.<sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> <a href="/wiki/BYD_Auto" title="BYD Auto">BYD Auto</a>'s <a href="/wiki/BYD_F3DM" title="BYD F3DM">F3DM</a> sedan is a series-parallel <a href="/wiki/Plug-in_hybrid" title="Plug-in hybrid">plug-in hybrid</a> automobile, which went on sale in China in 2008.<sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> </p><p>The <a href="/wiki/Two-Mode_Hybrid" class="mw-redirect" title="Two-Mode Hybrid">Two-Mode Hybrid</a> name highlights the drive-train's ability to operate in all-electric (Mode 1, or <i>Input-Split</i>) as well as hybrid (Mode 2, or <i>Compound-Split</i>) modes. The design allows for operation in more than two modes. Two power-split modes are available, along with several fixed-gear (essentially parallel hybrid) regimes. Such a design can be referred to as a multi-regime design.<sup id="cite_ref-36" class="reference"><a href="#cite_note-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> The Two-Mode Hybrid powertrain design can be classified as a compound-split design, since the addition of four clutches within the transmission allows for multiple configurations of engine power-splitting. In addition to the clutches, this transmission has a second planetary gearset. The objective of the design is to vary the percentage of mechanically vs. electrically transmitted power to cope both with low-speed and high-speed operating conditions. This enables smaller motors to do the job of larger motors when compared to single-mode systems, because the derived electrical peak power is proportional to the width of the continuous variation range. The four fixed gears enable the Two-Mode Hybrid to function like a conventional parallel hybrid under high continuous power regions such as sustained high speed cruising or trailer towing. Full electric boost is available in fixed-gear modes.<sup id="cite_ref-GM_Two-Mode_37-0" class="reference"><a href="#cite_note-GM_Two-Mode-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Types_by_degree_of_hybridization">Types by degree of hybridization</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=10" title="Edit section: Types by degree of hybridization"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="wikitable" style="margin: 1em auto 1em auto;"> <tbody><tr> <th>Type</th> <th><a href="/wiki/Start-stop_system" title="Start-stop system">Start-stop system</a></th> <th><a href="/wiki/Regenerative_braking" title="Regenerative braking">Regenerative braking</a><br />Electric boost</th> <th><a href="/wiki/Charge-depleting" title="Charge-depleting">Charge-depleting</a> mode</th> <th>Rechargeable</th> <th>Exhaust regeneration </th></tr> <tr> <td>Micro hybrid</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No</td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No</td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No</td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td></tr> <tr> <td><a href="/wiki/Mild_hybrid" title="Mild hybrid">Mild hybrid</a></td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No</td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No</td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td></tr> <tr> <td>Dual mild hybrid</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No</td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td></tr> <tr> <td>Full hybrid</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No</td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td></tr> <tr> <td>Dual full hybrid</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td></tr> <tr> <td><a href="/wiki/Plug-in_hybrid" title="Plug-in hybrid">Plug-in hybrid</a></td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#FFC7C7;color:black;vertical-align:middle;text-align:center;" class="table-no">No </td></tr> <tr> <td>Dual plug-in hybrid</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes</td> <td style="background:#9EFF9E;color:black;vertical-align:middle;text-align:center;" class="table-yes">Yes </td></tr></tbody></table> <div class="mw-heading mw-heading3"><h3 id="Dual_hybrids">Dual hybrids</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=11" title="Edit section: Dual hybrids"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>These contain two different energy recovery systems. This is a transversal categorization. </p> <div class="mw-heading mw-heading3"><h3 id="Micro_hybrids">Micro hybrids</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=12" title="Edit section: Micro hybrids"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Micro hybrid is a general term given to vehicles that use some type of <a href="/wiki/Start-stop_system" title="Start-stop system">start-stop system</a> to automatically shut off the engine when <a href="/wiki/Idle_speed" class="mw-redirect" title="Idle speed">idling</a>. Strictly speaking, micro hybrids are not real hybrid vehicles, because they do not rely on two different sources of power.<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Mild_hybrids">Mild hybrids</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=13" title="Edit section: Mild hybrids"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Mild_hybrid" title="Mild hybrid">Mild hybrid</a></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:2006_GMC_Sierra_Hybrid_engine.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b5/2006_GMC_Sierra_Hybrid_engine.jpg/220px-2006_GMC_Sierra_Hybrid_engine.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b5/2006_GMC_Sierra_Hybrid_engine.jpg/330px-2006_GMC_Sierra_Hybrid_engine.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b5/2006_GMC_Sierra_Hybrid_engine.jpg/440px-2006_GMC_Sierra_Hybrid_engine.jpg 2x" data-file-width="2272" data-file-height="1704" /></a><figcaption>Engine compartment of a 2006 <a href="/wiki/GMC_Sierra" class="mw-redirect" title="GMC Sierra">GMC Sierra</a> Hybrid</figcaption></figure> <p>Mild hybrids are essentially conventional vehicles with some hybrid hardware, but with limited hybrid features. Typically, they are a parallel hybrid with start-stop and modest levels of engine-assist or regenerative braking. Mild hybrids generally cannot provide all-electric propulsion. </p><p>Mild hybrids like the General Motors 2004–2007 Parallel Hybrid Truck (PHT) and the Honda Eco-Assist hybrids are equipped with a <a href="/wiki/Three-phase" class="mw-redirect" title="Three-phase">three-phase</a> electric motor mounted within the bell-housing between the engine and transmission, allowing the engine to be turned off whenever the truck is coasting, braking, or stopped, yet restart quickly to provide power. Accessories can continue to run on electrical power while the engine is off, and as in other hybrid designs, regenerative braking recaptures energy. The large electric motor spins up the engine to operating-speeds before injecting fuel. </p><p>The 2004–2007 <a href="/wiki/Chevrolet_Silverado#First-generation_Silverado_/_second-generation_Sierra_(GMT800;_1999)" title="Chevrolet Silverado">Chevrolet Silverado</a> PHT was a full-size <a href="/wiki/Pickup_truck" title="Pickup truck">pickup truck</a>. Chevrolet was able to get a 10% efficiency improvement by shutting down and restarting the engine on demand and using regenerative braking. The electrical energy was used only to drive accessories such as power steering. The GM PHT used a <a href="/wiki/42-volt_electrical_system" title="42-volt electrical system">42 volt system</a> via three 12 volt vented <a href="/wiki/Lead%E2%80%93acid_battery" title="Lead–acid battery">lead acid batteries</a> connected in series (36V total) to supply the power needed for the startup motor, as well as to power the electronic accessories. </p><p><a href="/wiki/General_Motors" title="General Motors">General Motors</a> then introduced their <a href="/wiki/BAS_Hybrid" class="mw-redirect" title="BAS Hybrid">BAS Hybrid</a> system, another <a href="/wiki/Mild_hybrid" title="Mild hybrid">mild-hybrid</a> implementation officially released on the 2007 <a href="/wiki/Saturn_Vue#Green_Line" title="Saturn Vue">Saturn Vue Green Line</a>. Its "start-stop" functionality operates similarly to the Silverado, although via a belted connection to the motor/generator unit. However the GM <a href="/wiki/BAS_Hybrid" class="mw-redirect" title="BAS Hybrid">BAS Hybrid System</a> can also provide modest assist under acceleration and during steady driving, and captures energy during regenerative (blended) braking. BAS Hybrid offered as much as a 27% improvement in combined <a href="/wiki/Fuel_efficiency" title="Fuel efficiency">fuel efficiency</a> in EPA testing of the 2009 Saturn VUE.<sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> The system can also be found on the 2008–2009 <a href="/wiki/Saturn_Aura#Aura_Green_Line" title="Saturn Aura">Saturn Aura Green Line</a> and the 2008–2010 <a href="/wiki/Chevrolet_Malibu#Seventh_generation_(2008)" title="Chevrolet Malibu">Chevrolet Malibu</a> hybrids. </p><p>Another way to offer start/stop is by employing a static start engine. Such an engine requires no starter motor, but employs sensors to determine the exact position of each piston, then precisely timing the injection and ignition of fuel to <i>turn over</i> the engine.<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup> </p><p>Mild hybrids are sometimes called <i>power-assist hybrids</i> as they use the ICE for primary power, with a torque-boosting electric motor connected to a (largely) conventional power train. The electric motor is mounted between the engine and transmission. It is essentially a large starter motor that operates when the engine needs to be turned over and when the driver "steps on the gas" and requires extra power. The electric motor may also restart the combustion engine and shutting down the main engine at idle, while the enhanced battery system is used to power accessories.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (September 2009)">citation needed</span></a></i>]</sup> GM announced <a href="/wiki/Buick_LaCrosse#eAssist" title="Buick LaCrosse">Buick LaCrosse</a> and <a href="/wiki/Buick_Regal#eAssist" title="Buick Regal">Buick Regal</a> mild-hybrids dubbed Eassist. </p><p>Before 2015, <a href="/wiki/Honda" title="Honda">Honda</a>'s hybrids, including the <a href="/wiki/Honda_Insight" title="Honda Insight">Insight</a>, used this design, leveraging their expertise in small, efficient gasoline engines; their system is dubbed <a href="/wiki/Integrated_Motor_Assist" title="Integrated Motor Assist">Integrated Motor Assist</a> (IMA). IMA hybrids cannot provide propulsion on electric power alone. However, since the amount of electrical power needed is much smaller, system size is reduced. </p><p>Another variation is the <a href="/wiki/Saturn_Vue#Green_Line" title="Saturn Vue">Saturn Vue Green Line</a> BAS Hybrid system that uses a smaller electric motor (mounted to the side of the engine) and battery pack than the Honda IMA, but functions similarly. </p><p>Another variation on this type is <a href="/wiki/Mazda" title="Mazda">Mazda</a>'s e-4WD system, offered on the <a href="/wiki/Mazda_Demio" title="Mazda Demio">Mazda Demio</a> sold in Japan.<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> This <a href="/wiki/Front-wheel_drive" title="Front-wheel drive">front-wheel drive</a> vehicle has an electric motor that can drive the rear wheels when extra <a href="/wiki/Traction_(engineering)" class="mw-redirect" title="Traction (engineering)">traction</a> is needed. The system is disengaged in all other driving conditions, so it does not directly enhance performance or economy but allows the use of a smaller and more economical engine relative to total performance. </p><p>Ford has dubbed Honda's hybrids "mild" in their advertising for the Escape Hybrid, arguing that the Escape's full hybrid design is more efficient. </p><p>The <a href="/wiki/Genesis_G90" title="Genesis G90">Genesis G90</a> and <a href="/wiki/Genesis_GV80#GV80_Coupe" title="Genesis GV80">Genesis GV80 Coupe</a> offer mild hybrid options with an <a href="/wiki/Electric_supercharger" title="Electric supercharger">electric supercharger</a>.<sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-43" class="reference"><a href="#cite_note-43"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Dual_mild_hybrids">Dual mild hybrids</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=14" title="Edit section: Dual mild hybrids"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>These contain two different energy recovery systems. </p><p>The <a href="/wiki/Mercedes-Benz_C-Class_(W206)" title="Mercedes-Benz C-Class (W206)">Mercedes-Benz C-Class (W206)</a>, <a href="/wiki/Mercedes-AMG_SL_(R232)" class="mw-redirect" title="Mercedes-AMG SL (R232)">Mercedes-AMG SL 43 (R232)</a>, the Mercedes-AMG CLE 53, the petrol <a href="/wiki/Mercedes-Benz_GLC#Second_generation_(X254/C254;_2022)" title="Mercedes-Benz GLC">Mercedes C254/X254</a>, and the Porsche 911 Carrera GTS T-Hybrid have an <a href="/wiki/Electrically-assisted_turbocharger" class="mw-redirect" title="Electrically-assisted turbocharger">electrically-assisted turbocharger</a>/<a href="/wiki/MGU-H" class="mw-redirect" title="MGU-H">MGU-H</a>.<sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-mgu-h_45-0" class="reference"><a href="#cite_note-mgu-h-45"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-46" class="reference"><a href="#cite_note-46"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Full_hybrids">Full hybrids</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=15" title="Edit section: Full hybrids"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:2006_Mercury_Mariner_Hybrid_engine.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7a/2006_Mercury_Mariner_Hybrid_engine.jpg/220px-2006_Mercury_Mariner_Hybrid_engine.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7a/2006_Mercury_Mariner_Hybrid_engine.jpg/330px-2006_Mercury_Mariner_Hybrid_engine.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7a/2006_Mercury_Mariner_Hybrid_engine.jpg/440px-2006_Mercury_Mariner_Hybrid_engine.jpg 2x" data-file-width="2272" data-file-height="1704" /></a><figcaption>Engine compartment of a 2006 <a href="/wiki/Mercury_Mariner_Hybrid" class="mw-redirect" title="Mercury Mariner Hybrid">Mercury Mariner Hybrid</a> </figcaption></figure> <p>A <b>full hybrid</b>, sometimes also called a <b>strong hybrid</b>, is a vehicle that can run on just the engine, the batteries, or a combination. The <a href="/wiki/Toyota_Prius" title="Toyota Prius">Toyota Prius</a>, <a href="/wiki/Toyota_Camry_Hybrid" class="mw-redirect" title="Toyota Camry Hybrid">Toyota Camry Hybrid</a>, <a href="/wiki/Ford_Escape_Hybrid" class="mw-redirect" title="Ford Escape Hybrid">Ford Escape Hybrid</a>/<a href="/wiki/Mercury_Mariner_Hybrid" class="mw-redirect" title="Mercury Mariner Hybrid">Mercury Mariner Hybrid</a>, <a href="/wiki/Ford_Fusion_Hybrid" title="Ford Fusion Hybrid">Ford Fusion Hybrid</a>/<a href="/wiki/Lincoln_MKZ_Hybrid" class="mw-redirect" title="Lincoln MKZ Hybrid">Lincoln MKZ Hybrid</a>/<a href="/wiki/Mercury_Milan_Hybrid" class="mw-redirect" title="Mercury Milan Hybrid">Mercury Milan Hybrid</a>, <a href="/wiki/Ford_C-Max_Hybrid" class="mw-redirect" title="Ford C-Max Hybrid">Ford C-Max Hybrid</a>, <a href="/wiki/Ford_Maverick_(2022)" title="Ford Maverick (2022)">Ford Maverick Hybrid</a>, <a href="/wiki/Kia_Optima_Hybrid" class="mw-redirect" title="Kia Optima Hybrid">Kia Optima Hybrid</a>, <a href="/wiki/Toyota_Sienna#Fourth_generation_(XL40;_2020)" title="Toyota Sienna">Toyota Sienna Hybrid</a>, as well as the General Motors <a href="/wiki/2-mode_hybrid" class="mw-redirect" title="2-mode hybrid">2-mode hybrid</a> trucks and SUVs, are examples of this type of hybridization as they can operate on battery power alone. A large, high-capacity battery provides battery-only operation. These vehicles have a split power path that allows more flexibility in the drivetrain by inter-converting mechanical and electrical power. To balance the forces from each portion, the vehicles use a <a href="/wiki/Differential_(mechanical_device)" title="Differential (mechanical device)">differential</a>-style linkage between the engine and motor connected to the head end of the transmission. </p><p>The Toyota brand name for this technology is <a href="/wiki/Hybrid_Synergy_Drive" title="Hybrid Synergy Drive">Hybrid Synergy Drive</a>, which is used in the Prius, the <a href="/wiki/Toyota_Highlander_Hybrid" class="mw-redirect" title="Toyota Highlander Hybrid">Highlander Hybrid</a> <a href="/wiki/Sport_utility_vehicle" class="mw-redirect" title="Sport utility vehicle">SUV</a> and the <a href="/wiki/Camry_Hybrid" class="mw-redirect" title="Camry Hybrid">Camry Hybrid</a>. A computer oversees system operation, determining how to mix the power sources. The Prius operations can be divided into six distinct regimes:– </p> <dl><dd><b>Electric vehicle mode</b>—The ICE is off and the battery powers the motor (or charges during regenerative braking). Used for idling when the battery <a href="/wiki/State_of_charge" title="State of charge">state of charge</a> (SOC) is high.</dd></dl> <dl><dd><b>Cruise mode</b>—The vehicle is cruising (i.e. not accelerating), and the ICE can meet the demand. The power from the engine is split between the mechanical path and the generator. The battery also powers the motor, whose power is summed mechanically with the engine. If the battery state-of-charge is low, part of the power from the generator charges the battery.</dd></dl> <dl><dd><b>Overdrive mode</b>—A portion of the <a href="/wiki/Rotational_energy" title="Rotational energy">rotational energy</a> produces electricity, because the ICE's full power is not needed to maintain speed. This electrical energy is used to drive the sun gear in the direction opposite its usual rotation. The end result has the ring gear rotating faster than the engine, albeit at lower torque.</dd></dl> <dl><dd><b>Battery charge mode</b>—Also used for idling, except that in this case the battery state-of-charge is low and requires charging, which is provided by the engine and generator.</dd></dl> <dl><dd><b>Power boost mode</b>—Employed in situations where the engine cannot maintain the desired speed. The battery powers the motor to complement the engine power.</dd></dl> <dl><dd><b>Negative split mode</b>—The vehicle is cruising and the battery state-of-charge is high. The battery provides power to both the motor (to provide mechanical power) and to the generator. The generator converts this to mechanical energy that it directs towards the engine shaft, slowing it down (although not altering its torque output). The purpose of this engine "lugging" is to increase the fuel economy of the vehicle.</dd></dl> <div class="mw-heading mw-heading4"><h4 id="Dual_full_hybrids">Dual full hybrids</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=16" title="Edit section: Dual full hybrids"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>These contain two different energy recovery systems. An example of dual hybrids are <a href="/wiki/Formula_One_car" title="Formula One car">Formula One cars</a> (See <a href="/wiki/Formula_One_engines#2014–2021" title="Formula One engines">Formula One engines#2014–2021</a> and <a href="/wiki/Formula_One_engines#2022–2025" title="Formula One engines">Formula One engines#2022–2025</a>). Other examples are the <a href="/wiki/Porsche_919_Hybrid" title="Porsche 919 Hybrid">Porsche 919 Hybrid</a>, and the <a href="/wiki/Infiniti_Q60#Project_Black_S" title="Infiniti Q60">Infiniti Project Black S</a> which was cancelled. </p> <div class="mw-heading mw-heading3"><h3 id="Plug-in_hybrid">Plug-in hybrid</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=17" title="Edit section: Plug-in hybrid"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Volt_charging.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7b/Volt_charging.jpg/220px-Volt_charging.jpg" decoding="async" width="220" height="293" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7b/Volt_charging.jpg/330px-Volt_charging.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7b/Volt_charging.jpg/440px-Volt_charging.jpg 2x" data-file-width="2736" data-file-height="3648" /></a><figcaption><a href="/wiki/Chevrolet_Volt" title="Chevrolet Volt">Chevrolet Volt</a> charging</figcaption></figure> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Plug-in_hybrid" title="Plug-in hybrid">Plug-in hybrid</a></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Vehicle-to-grid" title="Vehicle-to-grid">Vehicle-to-grid</a> and <a href="/wiki/Plug-in_electric_vehicle" title="Plug-in electric vehicle">Plug-in electric vehicle</a></div> <p>A <a href="/wiki/Plug-in_hybrid_electric_vehicle" class="mw-redirect" title="Plug-in hybrid electric vehicle">plug-in hybrid electric vehicle</a> (PHEV) has two defining characteristics. It: </p> <ul><li>Can be plugged into an electrical outlet to be charged.</li> <li>Can travel powered only by the battery.</li></ul> <p>They are full hybrids, able to run on battery power. They offer greater battery capacity and the ability to recharge from the <a href="/wiki/Electric_power_transmission" title="Electric power transmission">grid</a>. They can be either parallel or series designs. They are also called <i>gas-optional</i>, or <i>griddable</i> hybrids. Their main benefit is that they can be gasoline-independent for significant distances, with the extended range of an ICE for longer trips. <a href="/wiki/Electric_Power_Research_Institute" title="Electric Power Research Institute">Electric Power Research Institute</a> research found a lower <a href="/wiki/Total_cost_of_ownership" title="Total cost of ownership">total cost of ownership</a> for PHEVs due to reduced service costs and gradually improving battery technology. The "<a href="/wiki/Well-to-wheel" class="mw-redirect" title="Well-to-wheel">well-to-wheel</a>" efficiency and emissions of PHEVs compared to gasoline hybrids depends on the grid energy sources (the US grid is 30% <a href="/wiki/Coal" title="Coal">coal</a>; California's grid is primarily <a href="/wiki/Natural_gas" title="Natural gas">natural gas</a>, <a href="/wiki/Hydroelectric_power" class="mw-redirect" title="Hydroelectric power">hydroelectric power</a>, and <a href="/wiki/Wind_power" title="Wind power">wind power</a>). </p> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Byd_duel_mode_engine.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/05/Byd_duel_mode_engine.jpg/220px-Byd_duel_mode_engine.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/05/Byd_duel_mode_engine.jpg/330px-Byd_duel_mode_engine.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/05/Byd_duel_mode_engine.jpg/440px-Byd_duel_mode_engine.jpg 2x" data-file-width="1024" data-file-height="768" /></a><figcaption>Engine compartment of a <a href="/wiki/BYD_F3DM" title="BYD F3DM">BYD F3DM</a> plug-in hybrid</figcaption></figure> <p><a href="/wiki/Prototype" title="Prototype">Prototypes</a> of PHEVs, with larger battery packs that can be recharged from the power grid, were built in the U.S., notably at <a href="/wiki/Andrew_A._Frank" title="Andrew A. Frank">Andy Frank</a>'s Hybrid Center<sup id="cite_ref-47" class="reference"><a href="#cite_note-47"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup> at <a href="/wiki/University_of_California,_Davis" title="University of California, Davis">University of California, Davis</a>. One production PHEV, the <a href="/wiki/Renault_Kangoo" title="Renault Kangoo">Renault Kangoo</a>, went on sale in France in 2003. <a href="/wiki/DaimlerChrysler" class="mw-redirect" title="DaimlerChrysler">DaimlerChrysler</a> built PHEVs based on the <a href="/wiki/Mercedes-Benz_Sprinter" title="Mercedes-Benz Sprinter">Mercedes-Benz Sprinter</a> <a href="/wiki/Van" title="Van">van</a>. Light Trucks are offered by <a href="/wiki/Micro-Vett" title="Micro-Vett">Micro-Vett SPA</a><sup id="cite_ref-48" class="reference"><a href="#cite_note-48"><span class="cite-bracket">[</span>48<span class="cite-bracket">]</span></a></sup> the so-called Daily Bimodale. </p><p>The California Cars Initiative converted the 2004 and newer Toyota Prius to become a prototype of what it calls PRIUS+. With the addition of 140 kg (300 lb) of <a href="/wiki/Lead%E2%80%93acid_batteries" class="mw-redirect" title="Lead–acid batteries">lead–acid batteries</a>, the PRIUS+ achieved roughly double the gasoline <a href="/wiki/Fuel_economy_in_automobiles" title="Fuel economy in automobiles">mileage</a> of a standard Prius and could make trips of up to 16 kilometres (10 mi) using only electric power.<sup id="cite_ref-49" class="reference"><a href="#cite_note-49"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup> </p><p>Chinese battery manufacturer and automaker <a href="/wiki/BYD_Auto" title="BYD Auto">BYD Auto</a> released the <a href="/wiki/BYD_F3DM" title="BYD F3DM">F3DM</a> compact <a href="/wiki/Sedan_(automobile)" title="Sedan (automobile)">sedan</a> to the Chinese fleet market on December 15, 2008,<sup id="cite_ref-F3DM_50-0" class="reference"><a href="#cite_note-F3DM-50"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-bwf3dm_51-0" class="reference"><a href="#cite_note-bwf3dm-51"><span class="cite-bracket">[</span>51<span class="cite-bracket">]</span></a></sup> later replaced by the <a href="/wiki/BYD_Qin" title="BYD Qin">BYD Qin</a> plug-in hybrid.<sup id="cite_ref-52" class="reference"><a href="#cite_note-52"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-53" class="reference"><a href="#cite_note-53"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup> </p><p>General Motors began deliveries of the <a href="/wiki/Chevrolet_Volt" title="Chevrolet Volt">Chevrolet Volt</a> in the United States in December 2010,<sup id="cite_ref-R1_5-1" class="reference"><a href="#cite_note-R1-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> and its sibling, the Opel Ampera, was released in Europe by early 2012.<sup id="cite_ref-FirstRetailDelivery_54-0" class="reference"><a href="#cite_note-FirstRetailDelivery-54"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-55" class="reference"><a href="#cite_note-55"><span class="cite-bracket">[</span>55<span class="cite-bracket">]</span></a></sup> As of November 2012<sup class="plainlinks noexcerpt noprint asof-tag update" style="display:none;"><a class="external text" href="https://en.wikipedia.org/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit">[update]</a></sup>, other plug-in hybrids available in several markets were the <a href="/wiki/Fisker_Karma" title="Fisker Karma">Fisker Karma</a>, <a href="/wiki/Toyota_Prius_Plug-in_Hybrid" title="Toyota Prius Plug-in Hybrid">Toyota Prius Plug-in Hybrid</a> and <a href="/wiki/Ford_C-Max_Energi" class="mw-redirect" title="Ford C-Max Energi">Ford C-Max Energi</a>. </p><p>As of October 2012<sup class="plainlinks noexcerpt noprint asof-tag update" style="display:none;"><a class="external text" href="https://en.wikipedia.org/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit">[update]</a></sup>, the best selling PHEV is the Volt, with more than 33,000 units of the Volt/Ampera family sold worldwide since December 2010, led by US sales of 27,306,<sup id="cite_ref-PEVsalesUS0712_56-0" class="reference"><a href="#cite_note-PEVsalesUS0712-56"><span class="cite-bracket">[</span>56<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-PEVSalesUS1012_57-0" class="reference"><a href="#cite_note-PEVSalesUS1012-57"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup> followed by the Netherlands with 2,175 Amperas sold through October 2012.<sup id="cite_ref-NetherSales2012_58-0" class="reference"><a href="#cite_note-NetherSales2012-58"><span class="cite-bracket">[</span>58<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NetherSales1012_59-0" class="reference"><a href="#cite_note-NetherSales1012-59"><span class="cite-bracket">[</span>59<span class="cite-bracket">]</span></a></sup> The Prius Plug-in Hybrid had sold 21,600 units sold worldwide through October 2012, with US sales of 9,623 units, followed by Japan with 9,500 units.<sup id="cite_ref-PEVSalesUS1012_57-1" class="reference"><a href="#cite_note-PEVSalesUS1012-57"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-PiPSales1012_60-0" class="reference"><a href="#cite_note-PiPSales1012-60"><span class="cite-bracket">[</span>60<span class="cite-bracket">]</span></a></sup> More recently, the 4xe variants of the <a href="/wiki/Jeep_Wrangler_(JL)" title="Jeep Wrangler (JL)">Jeep Wrangler</a> and <a href="/wiki/Jeep_Grand_Cherokee#Fifth_generation_(WL;_2021)" title="Jeep Grand Cherokee">Jeep Grand Cherokee</a> have become the best-selling PHEVs in the U.S., respectively selling 67,429 and 45,684 units in calendar 2023.<sup id="cite_ref-61" class="reference"><a href="#cite_note-61"><span class="cite-bracket">[</span>61<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Dual_plug-in_hybrids">Dual plug-in hybrids</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=18" title="Edit section: Dual plug-in hybrids"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>These contain two different energy recovery systems. Examples of such systems include the <a href="/wiki/Mercedes-AMG_ONE" title="Mercedes-AMG ONE">Mercedes-AMG ONE</a>, is a plug-in dual hybrid. The <a href="/wiki/Mercedes-Benz_C-Class_(W206)" title="Mercedes-Benz C-Class (W206)">Mercedes-Benz C-Class (W206)</a> and the <a href="/wiki/Mercedes-Benz_GLC#Second_generation_(X254/C254;_2022)" title="Mercedes-Benz GLC">Mercedes C254/X254</a> also have an <a href="/wiki/Electrically-assisted_turbocharger" class="mw-redirect" title="Electrically-assisted turbocharger">electrically-assisted turbocharger</a>/<a href="/wiki/MGU-H" class="mw-redirect" title="MGU-H">MGU-H</a>.<sup id="cite_ref-ams-2021-02_62-0" class="reference"><a href="#cite_note-ams-2021-02-62"><span class="cite-bracket">[</span>62<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-mgu-h_45-1" class="reference"><a href="#cite_note-mgu-h-45"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Types_by_power_source">Types by power source</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=19" title="Edit section: Types by power source"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Electric-internal_combustion_engine_hybrid">Electric-internal combustion engine hybrid</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=20" title="Edit section: Electric-internal combustion engine hybrid"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>There are many ways to create an electric-Internal Combustion Engine (ICE) hybrid. The variety of electric-ICE designs can be differentiated by how the electric and combustion portions of the powertrain connect, at what times each portion is in operation, and what percent of the power is provided by each hybrid component. Two major categories are <b>series hybrids</b> and <b>parallel hybrids</b>, though <b>parallel designs</b> are most common today. </p><p>Most hybrids, no matter the specific type, use <a href="/wiki/Regenerative_braking" title="Regenerative braking">regenerative braking</a> to recover energy when slowing down the vehicle. This simply involves driving a motor so it acts as a generator. </p><p>Many designs also shut off the internal combustion engine when it is not needed in order to save energy. That concept is not unique to hybrids; <a href="/wiki/Subaru" title="Subaru">Subaru</a> pioneered this feature in the early 1980s, and the <a href="/wiki/Volkswagen_Lupo" title="Volkswagen Lupo">Volkswagen Lupo 3L</a> is one example of a conventional vehicle that shuts off its engine when at a stop. Some provision must be made, however, for accessories such as <a href="/wiki/Air_conditioning" title="Air conditioning">air conditioning</a> which are normally driven by the engine. Furthermore, the lubrication systems of internal combustion engines are inherently least effective immediately after the engine starts; since it is upon startup that the majority of engine wear occurs, the frequent starting and stopping of such systems reduce the lifespan of the engine considerably.<sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Accuracy_dispute#Disputed_statement" title="Wikipedia:Accuracy dispute"><span title="frequent starting engines are already warm and lubricated (May 2014)">dubious</span></a> – <a href="/wiki/Talk:Hybrid_vehicle_drivetrain#Dubious" title="Talk:Hybrid vehicle drivetrain">discuss</a></i>]</sup> Also, start and stop cycles may reduce the engine's ability to operate at its optimum temperature, thus reducing the engine's efficiency. </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Hybridfuelcell.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f3/Hybridfuelcell.svg/220px-Hybridfuelcell.svg.png" decoding="async" width="220" height="88" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f3/Hybridfuelcell.svg/330px-Hybridfuelcell.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f3/Hybridfuelcell.svg/440px-Hybridfuelcell.svg.png 2x" data-file-width="1025" data-file-height="410" /></a><figcaption>Structure of a fuel cell hybrid electric vehicle</figcaption></figure> <div class="mw-heading mw-heading3"><h3 id="Electric-fuel_cell_hybrid">Electric-fuel cell hybrid</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=21" title="Edit section: Electric-fuel cell hybrid"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/Fuel_cell" title="Fuel cell">Fuel cell</a> vehicles are often fitted with a battery or supercapacitor to deliver peak acceleration power and to reduce the size and power constraints on the fuel cell (and thus its cost); this is effectively also a series hybrid configuration. </p> <div class="mw-heading mw-heading3"><h3 id="Internal_combustion_engine-hydraulic_hybrid">Internal combustion engine-hydraulic hybrid</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=22" title="Edit section: Internal combustion engine-hydraulic hybrid"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Chrysler_Pacifica_Hybrid_WAS_2017_1684.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Chrysler_Pacifica_Hybrid_WAS_2017_1684.jpg/220px-Chrysler_Pacifica_Hybrid_WAS_2017_1684.jpg" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Chrysler_Pacifica_Hybrid_WAS_2017_1684.jpg/330px-Chrysler_Pacifica_Hybrid_WAS_2017_1684.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Chrysler_Pacifica_Hybrid_WAS_2017_1684.jpg/440px-Chrysler_Pacifica_Hybrid_WAS_2017_1684.jpg 2x" data-file-width="3000" data-file-height="2000" /></a><figcaption><a href="/wiki/Chrysler" title="Chrysler">Chrysler</a> offers the <a href="/wiki/Chrysler_Pacifica_(RU)" class="mw-redirect" title="Chrysler Pacifica (RU)">Pacifica</a> minivan as a plug-in hybrid</figcaption></figure> <p>A <a href="/wiki/Hydraulic_hybrid" class="mw-redirect" title="Hydraulic hybrid">hydraulic hybrid</a> vehicle uses hydraulic and mechanical components instead of electrical. A <a href="/wiki/Variable_displacement_pump" title="Variable displacement pump">variable displacement pump</a> replaces the electric motor/generator. A <a href="/wiki/Hydraulic_accumulator" title="Hydraulic accumulator">hydraulic accumulator</a> stores energy. The vessel typically carries a flexible bladder of pre-charged pressurized nitrogen gas. Pumped hydraulic fluid is compressed against the bladder storing the energy in the compressed nitrogen gas. Some versions have a piston in a cylinder rather than a pressurized bladder. The hydraulic accumulator is potentially cheaper and more durable than batteries. Hydraulic hybrid technology was originally implemented in Germany in the 1930s. Volvo Flygmotor used petro-hydraulic hybrids experimentally in buses from the early 1980s. </p><p>The initial concept involved a giant <a href="/wiki/Flywheel" title="Flywheel">flywheel</a> (see <a href="/wiki/Gyrobus" title="Gyrobus">Gyrobus</a>) for storage connected to a hydrostatic transmission. The system is under development by <a href="/wiki/Eaton_Corporation" title="Eaton Corporation">Eaton</a> and several other companies, primarily in heavy vehicles like buses, trucks and military vehicles. An example is the Ford F-350 Mighty Tonka concept truck shown in 2002. It features an Eaton system that can accelerate the truck to highway speeds. </p><p>The system components were expensive, which precluded installation in smaller trucks and cars. A drawback was that the power motors were not efficient enough at part load. Focus switched to smaller vehicles. A British company, <a href="/wiki/Artemis_Intelligent_Power" title="Artemis Intelligent Power">Artemis Intelligent Power</a>, made a breakthrough by introducing an electronically controlled hydraulic motor/pump that is efficient at all ranges and loads, making small applications of petro-hydraulic hybrids feasible.<sup id="cite_ref-63" class="reference"><a href="#cite_note-63"><span class="cite-bracket">[</span>63<span class="cite-bracket">]</span></a></sup> The company converted a BMW car to prove viability. The BMW 530i gave double the MPG in city driving compared to the standard car. The test used the standard 3,000 cc engine. Petro-hydraulic hybrids allows downsizing an engine to average power usage, not peak power usage. Peak power is provided by the energy stored in the accumulator.<sup id="cite_ref-64" class="reference"><a href="#cite_note-64"><span class="cite-bracket">[</span>64<span class="cite-bracket">]</span></a></sup> </p><p>The kinetic braking energy recovery rate is higher and therefore the system is more efficient than 2013-era battery charged hybrids, demonstrating a 60% to 70% increase in economy in EPA testing.<sup id="cite_ref-65" class="reference"><a href="#cite_note-65"><span class="cite-bracket">[</span>65<span class="cite-bracket">]</span></a></sup> In EPA tests a hydraulic hybrid Ford Expedition returned 32 mpg<sub>‑US</sub> (7.4 L/100 km) in urban driving and 22 mpg<sub>‑US</sub> (11 L/100 km) on the highway.<sup id="cite_ref-66" class="reference"><a href="#cite_note-66"><span class="cite-bracket">[</span>66<span class="cite-bracket">]</span></a></sup> </p><p>One research company's goal was to create a fresh design to improve the packaging of gasoline-hydraulic hybrid components. All bulky hydraulic components were integrated into the chassis. One design claimed to reach 130mpg in tests by using a large hydraulic accumulator that is also the structural chassis. The hydraulic driving motors are incorporated within the wheel hubs and reversing to recover braking energy. The aim is 170 mpg in average driving conditions. Energy created by shock absorbers and kinetic braking energy, that normally would be wasted, assists in charging the accumulator. An ICE sized for average power use charges the accumulator. The accumulator is sized to run the car for 15 minutes when fully charged.<sup id="cite_ref-67" class="reference"><a href="#cite_note-67"><span class="cite-bracket">[</span>67<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-68" class="reference"><a href="#cite_note-68"><span class="cite-bracket">[</span>68<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-69" class="reference"><a href="#cite_note-69"><span class="cite-bracket">[</span>69<span class="cite-bracket">]</span></a></sup> </p><p>In January 2011, Chrysler announced a partnership with the EPA to design and develop an experimental gasoline-hydraulic hybrid powertrain suitable for use in passenger cars. Chrysler adapted an existing production minivan to the powertrain.<sup id="cite_ref-70" class="reference"><a href="#cite_note-70"><span class="cite-bracket">[</span>70<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-71" class="reference"><a href="#cite_note-71"><span class="cite-bracket">[</span>71<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-72" class="reference"><a href="#cite_note-72"><span class="cite-bracket">[</span>72<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-73" class="reference"><a href="#cite_note-73"><span class="cite-bracket">[</span>73<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-74" class="reference"><a href="#cite_note-74"><span class="cite-bracket">[</span>74<span class="cite-bracket">]</span></a></sup> </p><p>NRG Dynamix of the U.S.A. claimed its approach reduced cost by one-third compared with electric hybrids and added only 300 lbs (136 kg) to vehicle weight vs. 1,000 lbs (454 kg) for electric hybrids. The company claimed a standard pickup vehicle powered by a 2.3-litre, 4-cylinder engine achieved 14 mpg (16.8 L/100 km) in city driving. Using the petro-hydraulic setup fuel economy reached "the mid 20s".<sup id="cite_ref-75" class="reference"><a href="#cite_note-75"><span class="cite-bracket">[</span>75<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Internal_combustion_engine-pneumatic">Internal combustion engine-pneumatic</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=23" title="Edit section: Internal combustion engine-pneumatic"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Compressed air can power a hybrid car with a gasoline compressor to provide the power. <a href="/wiki/Motor_Development_International" title="Motor Development International">Motor Development International</a> in France was developing such air-powered cars. A team led by Tsu-Chin Tsao, a <a href="/wiki/UCLA" class="mw-redirect" title="UCLA">UCLA</a> mechanical and aerospace engineering professor, collaborated with engineers from Ford to get pneumatic hybrid technology up and running. The system is similar to that of a hybrid-electric vehicle in that braking energy is harnessed and stored to assist the engine as needed during acceleration. </p> <div class="mw-heading mw-heading3"><h3 id="Human_power-environmental_power">Human power-environmental power</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=24" title="Edit section: Human power-environmental power"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Many land and water vehicles use human power combined with a further power source. Common are parallel hybrids, e.g. a sailboat with oars, <a href="/wiki/Motorized_bicycle" title="Motorized bicycle">motorized bicycles</a> or a <a href="/wiki/Human-electric_hybrid_vehicle" class="mw-redirect" title="Human-electric hybrid vehicle">human-electric hybrid vehicle</a> such as the <a href="/wiki/Twike" title="Twike">Twike</a>. Some series hybrids exist. Such vehicles can be <a href="/wiki/Tribrid_vehicle" class="mw-redirect" title="Tribrid vehicle">tribrid vehicles</a>, combining three power sources e.g. on-board solar cells, grid-charged batteries and pedals. </p> <div class="mw-heading mw-heading2"><h2 id="Hybrid_vehicle_operation_modes">Hybrid vehicle operation modes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=25" title="Edit section: Hybrid vehicle operation modes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Hybrid vehicles can be used in different modes. The figure shows some typical modes for a parallel hybrid configuration. </p> <figure class="mw-halign-center" typeof="mw:File/Thumb"><a href="/wiki/File:Hybrid_modes.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f3/Hybrid_modes.gif/500px-Hybrid_modes.gif" decoding="async" width="500" height="262" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f3/Hybrid_modes.gif/750px-Hybrid_modes.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/f/f3/Hybrid_modes.gif 2x" data-file-width="802" data-file-height="421" /></a><figcaption></figcaption></figure> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading2"><h2 id="Hybrid_drivetrain_topology">Hybrid drivetrain topology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=26" title="Edit section: Hybrid drivetrain topology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>P stands for Position. If there are multiple electric motors in different locations, may be written as P1 + P3 or P0 + P2.5 + P4. </p><p>Location of electric motor(s) in drivetrain: </p> <ul><li>P0 - beside, inside or in front of engine (Ex: <i>Belt-Alternator-Starter (<a href="/wiki/BAS_hybrid" title="BAS hybrid">BAS</a>) or Integrated Starter-Generator (<a href="/wiki/Integrated_starter-generator" class="mw-redirect" title="Integrated starter-generator">ISG</a>))</i></li> <li>P1 - engine output shaft (Ex: I<i>ntegrated motor-generator (IMG), integrated motor assist (<a href="/wiki/Integrated_Motor_Assist" title="Integrated Motor Assist">IMA</a>), flywheel assist system (FAS)</i><sup id="cite_ref-76" class="reference"><a href="#cite_note-76"><span class="cite-bracket">[</span>76<span class="cite-bracket">]</span></a></sup><i>)</i></li> <li>P2 - between engine and transmission</li> <li>P2.5 - inside transmission</li> <li>P3 - transmission output shaft</li> <li>P4 - rear axle</li> <li>P5 - inside the wheel(s) or propeller(s)<sup id="cite_ref-77" class="reference"><a href="#cite_note-77"><span class="cite-bracket">[</span>77<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="Aftermarket_options">Aftermarket options</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=27" title="Edit section: Aftermarket options"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Often, an <a href="/wiki/Aftermarket_(automotive)" class="mw-redirect" title="Aftermarket (automotive)">aftermarket</a> powertrain can be added to a vehicle. The aftermarket solution is used when the user delivers <a href="/wiki/Electric_vehicle_conversion" title="Electric vehicle conversion">glider</a> (<a href="/wiki/Rolling_chassis" title="Rolling chassis">rolling chassis</a>) and the hybrid (two engines) or all-electric (only an electric motor) powertrain kit to the <a href="/wiki/Automaker" class="mw-redirect" title="Automaker">automaker</a> and receives the vehicle with the tech installed. An (electric or hybrid) powertrain can be added to a glider<sup id="cite_ref-78" class="reference"><a href="#cite_note-78"><span class="cite-bracket">[</span>78<span class="cite-bracket">]</span></a></sup> by an aftermarket installer. </p><p>In 2013 a <a href="/wiki/University_of_Central_Florida" title="University of Central Florida">University of Central Florida</a> design team, <i>On the Green</i>, worked to develop a bolt-on hybrid conversion kit to transform an older model vehicle into a gas-electric hybrid.<sup id="cite_ref-79" class="reference"><a href="#cite_note-79"><span class="cite-bracket">[</span>79<span class="cite-bracket">]</span></a></sup> </p><p>A conversion of a 1966 Mustang was demonstrated by an engineer in California. The system replaced the alternator with a 12 kW (30 kW peak) brushless electric motor. Gas mileage and power improved.<sup id="cite_ref-80" class="reference"><a href="#cite_note-80"><span class="cite-bracket">[</span>80<span class="cite-bracket">]</span></a></sup> </p><p>There are <a href="/wiki/Hub_motor" class="mw-redirect" title="Hub motor">hub motors</a> that can be fitted in the wheel,<sup id="cite_ref-81" class="reference"><a href="#cite_note-81"><span class="cite-bracket">[</span>81<span class="cite-bracket">]</span></a></sup> or between the wheel and brake rotor<sup id="cite_ref-82" class="reference"><a href="#cite_note-82"><span class="cite-bracket">[</span>82<span class="cite-bracket">]</span></a></sup> of internal combustion vehicles to convert them to hybrid <a href="/wiki/Individual_wheel_drive" title="Individual wheel drive">individual wheel drive</a> (IWD). </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=28" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Battery_electric_vehicle" title="Battery electric vehicle">Battery electric vehicle</a></li> <li><a href="/wiki/Electric_vehicle" title="Electric vehicle">Electric vehicle</a> <ul><li><a href="/wiki/Electric_vehicle_battery#Battery_architecture_and_integration" title="Electric vehicle battery">Battery architecture and integration</a></li></ul></li> <li><a href="/wiki/Engine_control_unit" title="Engine control unit">Engine control unit</a></li> <li><a href="/wiki/Hybrid_electric_vehicle" title="Hybrid electric vehicle">Hybrid electric vehicle</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hybrid_vehicle_drivetrain&action=edit&section=29" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output 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CNBC.</span> </li> <li id="cite_note-bwf3dm-51"><span class="mw-cite-backlink"><b><a href="#cite_ref-bwf3dm_51-0">^</a></b></span> <span class="reference-text">Balfour, Frederik (December 15, 2008). <a rel="nofollow" class="external text" href="http://www.businessweek.com/globalbiz/content/dec2008/gb20081215_913780.htm">"China's First Plug-In Hybrid Car Rolls Out"</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20081220105009/http://www.businessweek.com/globalbiz/content/dec2008/gb20081215_913780.htm">Archived</a> 2008-12-20 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>. <i>Business Week</i>.</span> </li> <li id="cite_note-52"><span class="mw-cite-backlink"><b><a href="#cite_ref-52">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFVoelcker,_John2012" class="citation web cs1">Voelcker, John (April 20, 2012). <a rel="nofollow" class="external text" href="http://www.greencarreports.com/news/1075547_byd-chin-worlds-first-plug-in-hybrid-updated-and-renamed">"BYD Chin: World's First Plug-In Hybrid, Updated And Renamed"</a>. 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Autoblog Green.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=BYD%27s+Beijing+Motor+Show+line-up+includes+Chin+Dual+Mode%2C+remote-controlled+F3&rft.pub=Autoblog+Green&rft.date=2012-04-20&rft.au=Blanco%2C+Sebastian&rft_id=http%3A%2F%2Fgreen.autoblog.com%2F2012%2F04%2F20%2Fbyds-beijing-motor-show-line-up-includes-chin-dual-mode-remote%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHybrid+vehicle+drivetrain" class="Z3988"></span></span> </li> <li id="cite_note-FirstRetailDelivery-54"><span class="mw-cite-backlink"><b><a href="#cite_ref-FirstRetailDelivery_54-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFChambers2010" class="citation web cs1">Chambers, Nick (December 16, 2010). <a rel="nofollow" class="external text" href="http://www.plugincars.com/first-chevy-volts-reach-customers-will-out-deliver-nissan-december-106575.html">"First Chevy Volts Reach Customers, Will Out-Deliver Nissan in December"</a>. plugincars.com.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=First+Chevy+Volts+Reach+Customers%2C+Will+Out-Deliver+Nissan+in+December&rft.pub=plugincars.com&rft.date=2010-12-16&rft.aulast=Chambers&rft.aufirst=Nick&rft_id=http%3A%2F%2Fwww.plugincars.com%2Ffirst-chevy-volts-reach-customers-will-out-deliver-nissan-december-106575.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHybrid+vehicle+drivetrain" class="Z3988"></span></span> </li> <li id="cite_note-55"><span class="mw-cite-backlink"><b><a href="#cite_ref-55">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://media.opel.com/media/intl/en/opel/news.detail.html/content/Pages/news/intl/en/2012/opel/02_21_opel_ampera_first_customer">"Opel Ampera: First Customers Take Delivery"</a>. Opel Europe. February 21, 2012.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Opel+Ampera%3A+First+Customers+Take+Delivery&rft.pub=Opel+Europe&rft.date=2012-02-21&rft_id=http%3A%2F%2Fmedia.opel.com%2Fmedia%2Fintl%2Fen%2Fopel%2Fnews.detail.html%2Fcontent%2FPages%2Fnews%2Fintl%2Fen%2F2012%2Fopel%2F02_21_opel_ampera_first_customer&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHybrid+vehicle+drivetrain" class="Z3988"></span></span> </li> <li id="cite_note-PEVsalesUS0712-56"><span class="mw-cite-backlink"><b><a href="#cite_ref-PEVsalesUS0712_56-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFVoelcker,_John2012" class="citation web cs1">Voelcker, John (August 1, 2012). <a rel="nofollow" class="external text" href="http://www.greencarreports.com/news/1078116_july-plug-in-electric-car-sales-volt-steady-leaf-lethargic-again">"July Plug-In Electric Car Sales: Volt Steady, Leaf Lethargic (Again)"</a>. Green Car Reports.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=July+Plug-In+Electric+Car+Sales%3A+Volt+Steady%2C+Leaf+Lethargic+%28Again%29&rft.pub=Green+Car+Reports&rft.date=2012-08-01&rft.au=Voelcker%2C+John&rft_id=http%3A%2F%2Fwww.greencarreports.com%2Fnews%2F1078116_july-plug-in-electric-car-sales-volt-steady-leaf-lethargic-again&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHybrid+vehicle+drivetrain" class="Z3988"></span></span> </li> <li id="cite_note-PEVSalesUS1012-57"><span class="mw-cite-backlink">^ <a href="#cite_ref-PEVSalesUS1012_57-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-PEVSalesUS1012_57-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFCole,_Jay2012" class="citation web cs1">Cole, Jay (November 1, 2012). <a rel="nofollow" class="external text" href="https://insideevs.com/october-2012-plug-in-electric-vehicle-sales-report-card/">"October 2012 Plug-In Electric Vehicle Sales Report Card"</a>. Inside EVs.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=October+2012+Plug-In+Electric+Vehicle+Sales+Report+Card&rft.pub=Inside+EVs&rft.date=2012-11-01&rft.au=Cole%2C+Jay&rft_id=http%3A%2F%2Finsideevs.com%2Foctober-2012-plug-in-electric-vehicle-sales-report-card%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHybrid+vehicle+drivetrain" class="Z3988"></span></span> </li> <li id="cite_note-NetherSales2012-58"><span class="mw-cite-backlink"><b><a href="#cite_ref-NetherSales2012_58-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRAI2012" class="citation web cs1 cs1-prop-foreign-lang-source">RAI (2012-06-04). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20140328183047/http://www.raivereniging.nl/markt-informatie/statistieken/verkoopstatistieken.aspx">"Autoverkopen mei 2012 dalen met 4,4 procent"</a> [Car sales in May 2012 decreased by 4.4 percent] (in Dutch). RAI Vereniging. Archived from <a rel="nofollow" class="external text" href="http://www.raivereniging.nl/markt-informatie/statistieken/verkoopstatistieken.aspx">the original</a> on 2014-03-28<span class="reference-accessdate">. Retrieved <span class="nowrap">2012-08-05</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Autoverkopen+mei+2012+dalen+met+4%2C4+procent&rft.pub=RAI+Vereniging&rft.date=2012-06-04&rft.au=RAI&rft_id=http%3A%2F%2Fwww.raivereniging.nl%2Fmarkt-informatie%2Fstatistieken%2Fverkoopstatistieken.aspx&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHybrid+vehicle+drivetrain" class="Z3988"></span> <i>Download pdf file for detailed sales in 2011 and 2012 CYTD</i>.</span> </li> <li id="cite_note-NetherSales1012-59"><span class="mw-cite-backlink"><b><a href="#cite_ref-NetherSales1012_59-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRAI2012" class="citation web cs1 cs1-prop-foreign-lang-source">RAI (October 2012). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20121105075038/http://www.autoweek.nl/verkoopcijfers.php?verkoopjaar=2012&maand=10">"Verkoopcijfers oktober 2012 - Modellenoverzicht"</a> [Sales October 2012 - Models overview] (in Dutch). Auto Week Netherlands. Archived from <a rel="nofollow" class="external text" href="https://www.autoweek.nl/verkoopcijfers.php?verkoopjaar=2012&maand=10">the original</a> on 2012-11-05<span class="reference-accessdate">. Retrieved <span class="nowrap">2012-11-01</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Verkoopcijfers+oktober+2012+-+Modellenoverzicht&rft.pub=Auto+Week+Netherlands&rft.date=2012-10&rft.au=RAI&rft_id=http%3A%2F%2Fwww.autoweek.nl%2Fverkoopcijfers.php%3Fverkoopjaar%3D2012%26maand%3D10&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHybrid+vehicle+drivetrain" class="Z3988"></span> <i>Table shows September and October 2012 sales</i>.</span> </li> <li id="cite_note-PiPSales1012-60"><span class="mw-cite-backlink"><b><a href="#cite_ref-PiPSales1012_60-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20121111065020/http://www2.toyota.co.jp/en/news/12/11/1108_1.html">"Cumulative Sales of TMC Hybrids Top 2 Million Units in Japan"</a>. 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href="http://www.howstuffworks.com/3290-hybrid-cars-need-special-mechanics-video.htm">Hybrid Cars Need Special Mechanics</a> at <a href="/wiki/HowStuffWorks" title="HowStuffWorks">HowStuffWorks</a></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20080119112528/http://www.ecogeek.org/content/view/1298/">The Rise of the REEV</a></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20061210194839/http://www.ecoworld.com/blog/2006/11/10/serial-hybrids-are-here/">Serial Hybrids Are Here - Ecoworld.com</a></li> <li><a rel="nofollow" class="external text" href="http://science.discovery.com/fansites/discoveriesthisweek/videogallery/videogallery.html?myClip=dtw_aircar">Air Car video</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20061024154644/http://science.discovery.com/fansites/discoveriesthisweek/videogallery/videogallery.html?myClip=dtw_aircar">Archived</a> 2006-10-24 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20100906145407/http://www.zeroshift.com/transmission-technology/Hybrid-Electric-Vehicle-Transmissions.html">Zeroshift hybrid and electric vehicle Transmission (EV transmission) Systems</a></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul 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href="/wiki/Constant-velocity_joint" title="Constant-velocity joint">Constant-velocity joint</a></li> <li><a href="/wiki/Continuously_variable_transmission" title="Continuously variable transmission">Continuously variable transmission</a></li> <li><a href="/wiki/Coupling" title="Coupling">Coupling</a></li> <li><a href="/wiki/Differential_(mechanical_device)" title="Differential (mechanical device)">Differential</a></li> <li><a href="/wiki/Direct-shift_gearbox" title="Direct-shift gearbox">Direct-shift gearbox</a></li> <li><a href="/wiki/Drive_shaft" title="Drive shaft">Drive shaft</a></li> <li><a href="/wiki/Dual-clutch_transmission" title="Dual-clutch transmission">Dual-clutch transmission</a></li> <li><a href="/wiki/Drive_wheel" title="Drive wheel">Drive wheel</a></li> <li><a href="/wiki/Automated_manual_transmission" title="Automated manual transmission">Automated manual transmission</a></li> <li><a href="/wiki/Electrorheological_clutch" title="Electrorheological 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