Abstract
It is important to improve both the ride quality and the driving stability of vehicles. However, with conventional passive suspensions, these two requirements can rarely be simultaneously satisfied. In this paper, an active air suspension is constructed using a pneumatic cylinder and two electro pneumatic proportional pressure control valves, which has the advantage of inherent buffer function due to the air compressibility. However, an electro pneumatic control valve involves a considerable delay time which deteriorates the vibration control performance. To cope with this problem, the control valve delay is formulated as an input time delay in the discrete-time state equation, for which an optimal regulator with a state observer is designed. Through experiments, the applicability of this optimal control method for the active air suspension can be confirmed.
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