异步驱动电机扭矩波动对电动汽车纵向冲击影响的仿真研究

Research on electric vehicle longitudinal impact caused by oscillated torque of asynchronous motor by simulation

对电动汽车异步驱动电机在转子磁场定向矢量控制中因电机参数变化导致磁场解耦不完全,致使电机输出扭矩波动和扭矩及速度跟踪可能失效,进而带来纵向冲击和影响乘坐舒适性的问题进行了研究和分析,并在此基础上进行了电机控制策略的仿真分析.基于多体系统动力学建立了整车纵向动力学模型,并与控制系统一起建立了耦合仿真模型.利用所建立的耦合模型进行了电动汽车美国联邦循环工况（UDC）的仿真计算,计算结果表明所提出的矢量控制方法是可行的,能够有效改善电动汽车的纵向冲击问题.

The problem that the parametric variation of asynchronous motor in electric vehicles can induce the magnetic field imperfect decoupling in the direct field-oriented control, the oscillation of output torque, the failure of trace of the speed and torque, the longitudinal impact, and the influence on riding amenity was investigated and analyzed. On the basis of this, the simulation analysis in motor control was made. The longitudinal dynamics model of an electric vehicle was build based on multi-body system dynamics. The dynamics model was coupled with the control model of the motor control strategy. The simulation results of the coupled model based on the UDC drive cycle proved that the presented optimum direct field-oriented control method is feasible, and the riding amenity is improved effectively.