Abstract
Active suspensions for automobiles have attracted much interest in the attempt to improve the ride quality and driving stability simultaneously. In this paper, the usefulness of the preview feedforward control method for active suspension driven by pneumatic energy is investigated. A pneumatic actuator may be suitable for controlling the suspension because of its inherent vibration isolation function due to the effect of low stiffness, similar to a pneumatic spring. However, the low stiffness and operating delay of the control valve, used to drive a pneumatic cylinder, have negative effects on the performance of vibration isolation. The most significant problem of such active suspensions is balancing controllability and the low stiffness property. We have previously investigated the effectiveness of various control strategies for improving controllability. As part of our series of studies, the feedforward control scheme which utilizes incoming information about the road surface profile is examined. Experiments and simulations show the marked improvement of the vibration isolation property and the applicability of this control method is confirmed.
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