四轮转向汽车的动特性分析

建立了二自由度四轮转向汽车模型的动力学方程,并以此推演出汽车质心侧偏角为零时所需的前后轮转向比和横摆角速度与前轮转角的传递函数.最后以某轿车为例,通过使用MATLAB软件仿真分析汽车低速和高速下行驶时的时域响应和频域响应来比较四轮转向汽车与二轮转向汽车的动态特性.结果表明,较之二轮转向汽车,四轮转向汽车能大幅度的提高汽车对方向盘输入的动态响应特性,具有更好的机动性能和稳定性能.

The analysis of dynamic performance on four-wheel steering vehicle model

The dynamic equations of 2DOF Four-wheel steering vehicle model are constructed in this paper. It is deduced by the dynamic equations that the rate of steering angle and the transfer function about yaw-rate and front wheel steering angle which are the angles when the slip-angle of vehicle is equal to zero. Finally, taking a car as an example, authors compare the dynamic performances of 4WS vehicle to 2WS vehicle by using software MATLAB to analyze the time domain responses and the frequency domain responses of the vehicle at low speed and at high speed. And the results show that four-wheel steering vehicle can improve the dynamic responses to the same steering input. And it has far better handling stability than two-wheel steering vehicle.