Study on PID Control for Semi-active Air Suspension for Riding Comfort

In order to improve vehicle riding comfort and handling stability, a PID control system was designed. Regarding electronically controlled air suspension of a coach as the research subject, the PID control theory is applied to vehicle air spring suspension system. The PID control system is built up in Matlab/Simulink based on the a-quarter-vehicle model for simulating. The RMS of the vertical vibration acceleration of the sprung mass is simulated, which is the aim parameter, and the spring stiffness is the controlling amount. Then the PID control for air suspension is implemented on the rebuilt bench test system which is self-developed. Considering the simulation and test results, the conclusion can be drawn that the PID control algorithm is feasible and effective for controlling air suspension.