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APPENDIX E: BRIEF BACKGROUND ON POWERTRAINS
Pages 143-144

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From page 143...
... Moreover, many combinations are possible; therefore, system tradeoff analyses must be performed to fully understand the fuel efficiency potential of each. For instance, adding hybrid and regenerative braking driveling components reduces the power plant efficiency gain needed for the PNGV Goal 3 vehicle but increases the size, weight, complexity, and cost of the complete powertrain.
From page 144...
... In the series configuration, all of the engine power is transmitted to the wheels through electric machines. In a parallel configuration, the engine supplies some power directly to the drive wheels through a mechanical transmission, and this is supplemented by electrical machines and an electrical power source.


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