An active suspension control approach is designed for a quarter-vehicle suspension system using a filtered feedback control scheme and a novel compressible fluid suspension system. Analysis of feedback for the mechanical subsystem shows that motions of the sprung mass above and below the wheel frequency can be mitigated using skyhook damping plus active filtering of spring and damping coefficients. The frequency-dependent filtering is accomplished through an outer control loop that generates the target strut force, plus an inner force control loop. Performance of the active suspension control is demonstrated in simulations.
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