纯电动汽车AMT换挡时间和冲击优化控制策略

AMT Shift Time and Jerk Optimal Control Strategy for Pure Electric Vehicles

为了提高自动机械变速器(AMT)电动汽车舒适性,研究了AMT在换挡过程中的冲击问题,其本质原因是换挡电机控制不当导致同步器转速不到位.利用Adams和dSPACE等采集数据并分析问题产生机理,通过Meca标定软件标定控制参数,确定了最优PWM指令,减小了换挡末期的冲击,缩短了换挡时间和动力中断时间,提高了汽车乘坐舒适性和安全性.通过分段PWM控制标定和协同统一的换挡模式,冲击和换挡时间均可降低20~30%.在同步器结构不变的条件下,这种方法可以有效优化换挡时间和冲击.

In order to improve the comfort of the automatic mechanical transmission(AMT)electric vehicle,the impact of the AMT was studied during the shifting process.The essential reason is that the shift motor control is not appropriate,which leads to the synchronizer speed is not suitable.Data was collected and the problem generation mechanism was analysed by using Adams and dSPACE.Meca calibration software is used to calibrate the control parameters and determine the optimal PWM,which not only reduces the jerk at the end of the shift,but also shortens the shift time and power interruption time,improves the comfort and safety of vehicles.Both the jerk and the shift time are reduced by 20~30%through the segmented PWM control calibration and coordinated shift mode.This method can effectively optimize shift time and jerk when the synchronizer structure is unchanged.