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为实现装备机械式自动变速器(AMT)的纯电动轿车能够快速、准确、平稳地换挡,以建立的换挡过程数学模型为基础,详细分析了换挡过程不同阶段换挡冲击产生的机理,提出了摘挡前驱动电机切换至自由模式的转矩控制方法,确定了摘挡后驱动电机调速目标值和执行机构最优运动速度,提出了挂挡完成后驱动电机转矩恢复方法。针对换挡过程驱动电机的协调控制问题,提出了整车控制器控制驱动电机参与换挡过程的综合协调匹配控制方法。为了验证控制策略的正确性,研制开发了纯电动轿车用AMT样机,并进行了样车道路试验。试验结果表明:所制定的控制策略能很好地实现挡位的自动平顺切换,且换挡时间短。
In order to realize the fast, accurate and smooth shift of pure electric cars equipped with mechanical automatic transmission (AMT), based on the established mathematical model of shift process, the mechanism of shift shock in different stages of shift process is analyzed in detail. A torque control method of switching the drive motor to free mode before pick-up is proposed, the target value of the speed regulation of the drive motor after the pick-up and the optimum moving speed of the actuator are determined, and a torque recovery method of the driving motor after the gear is completed is put forward. In order to solve the problem of coordinated control of drive motor in shift process, a comprehensive coordinated matching control method is proposed for vehicle controller to control the drive motor to participate in the shift process. In order to verify the correctness of the control strategy, an AMT prototype for pure electric cars was developed and a prototype vehicle road test was carried out. The test results show that: the control strategy developed can realize the automatic smooth switching of gears and the shift time is short.