四轮转向分布式驱动电动汽车操纵稳定性研究

Study on handling stability of four-wheel steering distributed drive electric vehicles

为了研究电动汽车四轮转向技术对汽车操纵稳定性的影响,以某四轮转向电动汽车为研究对象,参照相关参数建立了二自由度模型;利用动态仿真软件CarSim,建立了四轮转向系统(4WS)电动汽车动力学模型,进行了低速转向和高速转向仿真。结果表明,与传统前轮转向汽车相比,4WS电动汽车在转弯时的横摆角速度波动较小,能更好抵抗外界干扰;4WS系统有效地提高了电动汽车高速和低速转弯时的稳定性和安全性能。

To study the impact of four-wheel steering technology on the handling stability of electric vehicles,a specific four-wheel steering(4WS)electric vehicle was taken as the research object,a two-degree-of-freedom model was established based on the relevant parameters.A dynamic simulation model of 4WS electric vehicle was then built by using the dynamic simulation software CarSim,and low speed steering and high speed steering were simulated.The results show that compared with the traditional front wheel steering vehicle,the yaw rate fluctuation of 4WS electric vehicle is smaller,and it can resist the outside interference better 4WS system effectively improves the stability and safety performance of electric vehicle during high-speed and low-speed cornering.