电动车辆组合式离合器换挡过程优化控制

Shift Process Optimal Control of Combined Clutch in Electric Vehicles

针对装配组合式离合器的两挡行星变速器电动车辆的换挡问题,建立了换挡过程动力学模型,选取冲击度和滑摩功作为综合控制目标,考虑换挡过程驱动电机转矩和变速器输出端阻力矩的变化,建立组合式离合器摩擦转矩线性二次型最优控制模型,得到油压最优控制轨迹.选取电机不同油门开度和路面坡道工况,仿真分析了两挡行星变速箱降挡的控制过程.结果表明,所得到的最优轨迹可以有效提高车辆的换挡品质,且换挡品质对电机转矩的变化较变速器输出端阻力矩的变化更为敏感.

In order to improve the shift quality of electric vehicles equipped with combined clutch planetary transmission with two gears, a dynamic model of shift process was established. Longitudinal jerk and friction work were chosen as the comprehensive control targets by considering the changes of the motor torque and the load torque. The linear quadratic optimal control model of combined clutch friction torque was built to realize the optimal control trajectory of clutch oil pressure. Compared with the optimal control under different throttle openings and road slopes, the simulation results have shown that the optimal trajectory can effectively improve the shift quality and it is more sensitive to the changes of the motor torque than that of the load torque.