Abstract: In order to realize the coordinated control of the vertical, pitch and roll vibration of vehicle, a coordinated control strategy of vehicle semi-active suspension is proposed. In the strategy, the fuzzy PID controllers estimate three adjustment forces according to the vibration state in vertical, pitch and roll directions. Through the designed force coordinator with the control parameters of the front and back axes and the steering control strategy, the expected adjustment forces are coordinated to the four magnetorheological dampers to output the adjustable damping forces and realize the coordinated control of the vehicle vibration in three directions. The experimental results on the continuous uneven and discrete impact road conditions show that the strategy improves the ride comfort and handling stability of vehicle, and is beneficial to the vehicle neutral steering.

Key words: semi-active suspension, coordinated control, fuzzy PID, force coordinator, steering control strategy