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Modeling and control of gear shifting of a non-synchronizer motor-transmission drive system |
| ZENG Yuanfan1, CHEN Hongxu2, WANG Lijun2, TIAN Guangyu1, ZHOU Weibo3 |
1. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;
2. Yibin Fengchuan Powertrain Technology Co., Ltd., Yibin 644000, China;
3. Sichuan Yitu Automobile Electronic Technology Co., Ltd., Yibin 644000, China |
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Abstract Power interruptions and impacts during shifting are the main reasons restricting large-scale applications of multi-gear transmissions in electric vehicles. This paper presents a non-synchronizer motor-transmission drive system. A hybrid automaton model was used to describe the shifting characteristics using multi-body dynamics. The dynamic characteristics of the model at each stage were then used to design a shifting control strategy with active synchronization of the angular speed and the rotation angle, such that the angular speeds and the angles of the sleeve and the gear ring are precisely synchronized while shifting. Simulations and tests show that the hybrid automaton shifting model predictions are consistent with the actual process and that the shift control strategy enables the non-synchronizer motor-transmission drive system to provide fast, non-impact shifting and shortens the power interruption time to less than 350 ms.
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| Keywords
motor-transmission drive system
gear shifting
gearshift control
hybrid systems
electric vehicles
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Issue Date: 31 August 2020
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2020,
Vol. 60
