At Bradley University in the Electrical Engineering Department, one ongoing project has been a Pneumatic Active Suspension System, controlled by a microprocessor-based controller. A combination of state variable feedback and a PID controller, implemented on an MC68HC16 microprocessor, controls valves which supply air to a pneumatic actuator operating in the pressure range of 35psi to 60 psi. The compensated system has a fast transient response and it is able to reject 20% of disturbance input. Controller design, computer simulation, hardware and experimental results are presented.
 

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