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.