主动前轮转向车辆操纵稳定性的仿真分析

Handling Stability Simulation Analysis of Vehicles with Active Front Wheel Steering

在建立主动前轮转向系统模型和整车模型的基础上,针对不同路面附着系数,分别考虑汽车有无主动转向、有无主动转向干预的情况,对整车在不同车速以及不同方向盘转角输入情况下进行阶跃响应及单移线仿真分析。仿真结果表明:阶跃输入时,在不同路面附着系数及方向盘转角下,汽车在低速转向时横摆角速度、质心侧偏角增大,转向更加灵敏,在高速时横摆角速度、质心侧偏角变小,转向更稳定、更安全;单移线运动时,在高路面附着系数以及小方向盘转角下,汽车在低速变道时因主动转向干预方向盘实际转角增大,变道更加灵敏、迅速,在高速变道时因主动转向干预方向盘实际转角变小,变道更稳定、安全。

In this paper, the active front steering system model and the vehicle model were established. Then, aiming at different road adhesion coefficient, the step response and single lane change simulation of the vehicle under different vehicle speed and steering angle were conducted, considering vehicle with and without active steering, active steering intervention, respectively. The simulation results show that, in the case of step input, the yaw rate and side-slip angle increase, and the steering is more sensitive in low speed, the yaw rate and side-slip angle become smaller, and the steering is more stable and secure in high speed, under different road adhesion coefficient and steering angle. In the case of single lane change simulation, the actual steering angle increases because of the active steering intervention under high road adhesion coefficient and small steering angle, and the manipulation is more sensitive and rapid in low speed change lanes, and the actual steering angle becomes smaller, and the manipulation is more stable and secure in high speed change lanes.