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Design Problems of the Semi-Active Wheel Suspension System and a Possible Way of Their Elimination
Published October 17, 1994 by Society of Automotive Engineers of China in China
In the paper the problems associated with the hydraulic semi- active wheel suspension system are investigated. On the basis of measured and simulated data a basic problem of the semi-active system of the mentioned kind is discovered. The problem called harshness arising from the switching of the damper is investigated and a possible way of its elimination is examined. In the first part of the paper the semi-active controller is designed using the well known sky-hook principle. Two different semi-active control concepts are analyzed (discrete and continuous) and the discrete controller is implemented in a real vehicle system. The measurements and the simulations give similar results. In the second part of the paper a switching pattern of the semi-active damper is designed using sliding mode control theory. The switching surface is determined to minimize the vertical acceleration of the vehicle body. The robustness of the sliding mode controller is compared to that of the active suspension designed by using combined H infinity/RLQR method.