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Transmission Configuration Effect on Total Efficiency of Electric Vehicle Powertrain
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| Author(s) |
Mohammad GERAMI TEHRANI, Juuso KELKKA, Jussi SOPANEN, Aki MIKKOLA, Kimmo KERKKÄNEN |
| Abstract |
This study investigates the impact of transmission topology on the combined mechanical and electricalefficiency of an Electric Vehicle (EV) by comparing two types of transmissions. In an EV, due tospace restrictions, a relatively high-speed electric motor is used with a reduction gear to provideadequate torque production. Since the electric motors efficiency varies according to the amount ofapplied torque at different speeds, there is a question of whether a multi-step gearbox capable ofincreasing the electric efficiency by shifting operation points along constant power curves can alsoimprove the powertrain overall efficiency. A mathematical model is developed for calculating thepower losses due to movement of mechanical components. In this study, a geartrain is taken intocloser analysis where a single reduction gear and a five-step gearbox are compared from an efficiencypoint of view. |
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| Filename: | 0147-epe2014-full-21064804.pdf |
| Filesize: | 281.7 KB |
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| Type |
Members Only |
| Date |
Last modified 2015-06-08 by System |
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