Study of Road Friendliness of Air Suspension Based on Suboptimal Control

In order to improve vehicle ride comfort and road-friendliness,based on nonlinear characteristics of a air spring,a air elastic model of spring was established on factors such as cuff pressure,and effective area. Using multivariable feedback mechanisms and improving the suboptimal control theory,so it could be applied to the air suspension. The quarter vehicle vibration model based on nonlinear characteristics of the air spring was established. Meanwhile,the models of air suspension,fuzzy controller and suboptimal controller were established using MATLAB /simulink software. The simulation results show that the controller based on non-linear air suspension can improve the vehicle ride comfort and road friendliness very much.