| SPECIAL SECTION: ELECTRIC VEHICLE |
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Active synchronizing control of transmission shifting without a synchronizer for electric vehicles |
| TIAN Feng1, WANG Lijun1,2, SUI Liqi1, ZENG Yuanfan1, ZHOU Xingyue3, TIAN Guangyu1 |
1. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;
2. Yibin Fengchuan Power Technology Co., Ltd., Yibin 644600, China;
3. Beijing Spacecrafts, China Academy of Space Technology, Beijing 100080, China |
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Abstract Motor coupled mechanical transmissions without synchronizers for electric vehicle applications have high transmission efficiencies, compact structures and low manufacturing costs. However, the synchronization of the sleeve to the ring gear is slow and can produce shift shock and failure. Active control of the driving motor torque is used here to provide "zero speed difference" and "zero angle difference" tracking control of the relative speed and angle between the ring gear and the sleeve. An optimal torque synchronizing control algorithm is used to avoid gear striking caused by frequent switching between the motor drive and the brake quadrants during the active synchronizing control using minimum working quadrant switching of the motor. Vehicle tests show that the active synchronizing control algorithm provides fast, stable shifting and shortens the power interruption time of the shifting process to less than 300 ms.
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| Keywords
electric vehicle
motor-transmission coupled system
automatic mechanical transmission
active synchronizing control
synchronizer
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Issue Date: 15 January 2020
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2020,
Vol. 60
