Abstract
Although most vehicle suspensions employ conventional passive spring and damper elements, improved suspension performance is achieved when an actuator is used to control the forces and relative velocities. The power requirements, complexity, and cost of fully active suspensions have restricted their use. This paper discusses an adaptive control technique being used for vehicle active suspension system. The concept of preview control, a control scheme in which the input is sensed well before it reaches the controlled plant, is investigated and may well be applied to guide vehicles over statistically described surfaces. In optimally controlled active suspensions with either full or incomplete state vector feedback, there is a trade-off between system performance and overall stiffness. The authors attempt to remove this limitation by incorporating the preview control with a state simulator.
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