An active pneumatic suspension system replaces a passive shock absorber by producing forces opposing uneven surfaces in the roadway. The active suspension system can provide a smoother ride allowing for better vehicle control, and less vehicle abuse. The prototype laboratory scale active suspension system consists of springs, a pneumatic actuator, solenoid valves, position and velocity sensors. The road disturbance input is simulated using an inverter driven A.C. motor. Signals from the position and velocity sensors are sent to a microprocessor which controls the pneumatic actuator. Some of the control algorithms which may be implemented include proportional and linear optimal quadratic control law. Presently, a proportional control law attenuates road disturbance input effect by 40%.
 

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