四驱混合动力汽车模式切换平顺性研究

Study of the Smooth Mode Switching on AWD Hybrid Electric Vehicle

为实现混合动力电动汽车纯电动模式与发动机工作模式平顺地切换,依据切换前后驱动转矩相等的原则.提出一种新的电机转矩算法.该算法根据CVT的速比控制规律、车速、节气门开度得出发动机的伪目标转速;根据发动机输出特性、节气门开度和伪发动机转速,得出发动机输出转矩,由此推导出电机输出转矩.仿真结果表明:模式切换前后整车驱动转矩基本一致,证明了此算法可实现混合动力电动汽车模式切换的平顺性.

This paper studied how to achieve hybrid electric vehicle＇s electric mode and engine mode switching smoothly. The main principle is the same driving torque. This paper proposed a new algorithm for the motor torque to achieve it. According to velocity and throttle and CVT＇s ratio, this algorithm ob- tains engine pseudo-target speed. According to engine output characteristics and throttle opening and engine speed,we got the engine output torque. And then we derived the motor output torque. Simulation results have shown that before and after mode switching, the vehicle drive torque is basically the same. It has been proved that the algorithm can achieve the smoothness of mode switching.