Abstract
Improving the driving range and driving performance are critical for pure electric vehicles (EV). Transmission ratios directly affects drivability and economy of EV. This paper analyzed the impact of various transmission ratios on the performance of EV, verified the vehicle performance with different transmission ratios by simulation with models built with GT-drive software, and based on EV performance requests, optimized the EV transmission ratios, presents single reduction gear and multi-speed transmission ratio scheme respectively, compared the EV performance with these two transmission schemes respectively, simulation results show that multi-speed transmission system can improve the performance of electric vehicle on dynamic and economy.
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