Three-speed transmission system for purely electric vehicles

This paper discusses the necessity of using a transmission system to improve the energy efficiency of purely electric vehicles (EVs). The energy efficiency of an electric motor varies at different operating points to meet the output power demand. The three gear ratios of a transmission system can ma...

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Bibliographic Details
Published in:International journal of automotive technology 2013-10, Vol.14 (5), p.773-778
Main Authors: Zhang, Z., Zuo, C., Hao, W., Zuo, Y., Zhao, X. L., Zhang, M.
Format: Article
Language:English
Subjects:
Analysis
Automotive Engineering
Demand
Driving conditions
Electric vehicles
Energy consumption
Energy efficiency
Energy management
Energy transmission
Engineering
Gear ratios
Gears
Optimization
Ratios
Simulation
Studies
Transmission components
Transmissions (automotive)
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Summary:This paper discusses the necessity of using a transmission system to improve the energy efficiency of purely electric vehicles (EVs). The energy efficiency of an electric motor varies at different operating points to meet the output power demand. The three gear ratios of a transmission system can maintain the motor speed within a stable region with relatively high energy efficiency, while various vehicle speeds are needed. This work is based on a light EV prototype. The optimized gear ratios of this transmission result in a considerably reduced energy consumption of 9.3% compared with conventional EVs with single-speed reducers under the condition of the Urban Dynamometer Driving Schedule driving cycle. Thus, the transmission system is necessary to improve the energy efficiency of EVs.
ISSN:1229-9138
1976-3832
DOI:10.1007/s12239-013-0085-0