四轮转向系统控制稳定性研究

Research on Control Stability of Four-wheel Steering System

基于车辆模型,针对四轮转向系统提出一种定前后轮比例控制策略,对四轮转向系统的控制稳定性进行研究。研究结果表明,相比传统前轮转向系统,横摆角速度反馈的四轮转向系统波动较小,超调量较小,达到稳定的时间较短。同时,定前后轮比例控制的四轮转向系统在车辆横摆角速度与质心侧偏角响应方面表现出更强的稳定性。采用定前后轮比例控制的四轮转向系统,可以有效改善车辆的动态稳定性,提高车辆的操纵稳定性。

A fixed front and rear wheel proportional control strategy was proposed for the four-wheel steering system based on the vehicle model, and the control stability of the four-wheel steering system was investigated. The findings show that compared with the traditional front wheel steering system, the four-wheel steering system with yaw rate feedback has less fluctuation, less overshooting and less time to reach stability.At the same time, the four-wheel steering system with fixed front and rear wheel proportional control shows stronger stability in response of vehicle yaw rate and centroid side yaw angle. The four-wheel steering system with fixed front and rear wheel proportional control can effectively improve the dynamic stability of the vehicle and enhance the steering stability of the vehicle.