Control Effect Analysis of Control Factors for Rear Wheel Steer Angle of Four-wheel-steering-vehicle

A Four-Wheel-Steering-Vehicle dynamic model with two degrees of freedom is presented in the article,and a dynamic model is built and simulated in MATLAB/Simulink.The control effect of Four-Wheel-Steering-Vehicle rear wheel steer angle control factors-front wheel steer angle control factor and yaw motions feedback control factor-to the vehicle handling stability and the operating safety has been simulated and compared.According to the simulation and analysis,it has been proved that the two factors can both decrease the sideslip and the lateral acceleration.However,the vehicle yaw motion has been reduced at the same time,which makes the loss of the driver's steering sense.Meanwhile,the control effect to the sideslip of the yaw motions feedback control factor shows duality. It is important and necessary to select the values of the two control factors properly during the vehicle design.