轮毂电动机驱动车辆电动机的失效安全性

Failsafe drive performance of EVs with four in-wheel motors

针对四轮独立驱动轮毂电动机式电动汽车电动机失效后车辆存在的安全性问题,提出了一种新型电动机失效控制策略.首先,失效控制器检测每台电动机的失效因子,判断失效类型;其次,根据油门踏板开度和转向盘转角决定失效控制目标,迅速协调正常工作电动机的输出转矩,以满足车辆期望纵向力矩和横摆力矩的需求,保证车辆行驶的动力性和稳定性.利用Simulink软件搭建了7自由度轮毂电动机驱动车辆动力学模型,对提出的控制策略进行了仿真研究.结果表明:该算法能在油门踏板开度大且转向盘转角小时保证汽车的动力性需求;在油门踏板开度较小或转向盘转角过大时进行稳定性协调控制,改善了电动机失效后车辆的行驶稳定性.

To improve the failsafe drive performance of four in-wheel motor-drive-type EVs, a novel con- trol strategy of the motor failure condition was proposed. The motor failure factor was detected to estimate failure type. According to the steering wheel angle and the accelerator pedal location, the control target was confirmed, and the coordination control of motor torque was regulated quickly to meet the expecta- tions of vehicle longitudinal force and yawing moment. Based on the dynamic model of a seven DOF in- wheel motor drive vehicle, the simulation of the proposed control strategy was carried out. The results show that the algorithm can enhance driving performance in high accelerator pedal and small steering wheel angle, and improve riding safety in low accelerator pedal or large steering wheel angle.