新型电子差速控制策略

Control Strategy of a New Type Electronic Differential

为了解决独立驱动电动汽车驱动轮转速不一致的问题,对前轮转向后轮驱动电动车进行了电子差速研究。提出基于直接横摆力矩控制的差速方案来设计模糊控制器,并进行驱动力控制,该方案提高了电动车在转向工况下的车辆稳定性。模糊控制器根据车辆状态决策出所需的横摆力矩,直接控制驱动力实现。最后采用CarSim和Matlab/Simulink联合仿真平台对控制方法进行了仿真试验验证。结果表明:基于横摆角速度控制的电子差速控制能够实现更好的跟踪期望,有效提高汽车在极限工况时的行驶稳定性。科学的仿真研究为后续实车研发提供了理论依据。

Aiming at the problem of the difference speed in independently driving wheels for the electric vehicle, steering in front wheels and driving in rear wheels is studied. The scheme of differential speed based on direct yaw moment control is presented, and a fuzzy controller is designed for driving force control,which can improve the stability of electric vehicle in the steering condition. The fuzzy controller can control the driving force directly according to the yaw moment of the vehicle. At last, the control method was verified based on the CarSim and Matlab/Simulink co-simulation in typical working condition. The results show that the electronic differential speed control based on the yaw moment control can achieve better tracking expectations and improve the driving stability of the vehicle in the limit condition. Scientific simulation research will provide a theoretical basis for the follow-up research and development.