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In spite of the superior performance of active vehicle suspension system (AVSS), its implementation on large commercial scale is impaired by challenges related to controller design and hardware. PID feedback control loop with a cascade of two other PID sub-loops for force control and spool valve displacement control has been employed in this work. The additional PID controller (in the inner loops) did not only help in stabilizing the actuator dynamics, they also increased the chances of better AVSS performance by the addition tuning variable added and the close tracking of a sinusoidal reference input. The control voltage, spool valve displacement and suspension travel signals were within required range throughout but the maximum allowable actuator force value and control voltage was marginally exceeded at the peak of the humps.

Active vehicle suspension system, PID control, controller design, actuator dynamics, spool valve.