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Constrained H control of active suspensions: an LMI approach

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2 Author(s)
Hong Chen ; Dept. of Control Sci. & Eng., Jilin Univ., Changchun, China ; Kong-Hui Guo

This paper suggests a constrained H control scheme for active suspensions with output and control constraints. The H performance is used to measure ride comfort so that more general road disturbances can be considered. Time-domain constraints, representing requirements for: 1) good road holding which may have an impact on safety; 2) suspension stroke limitation; and 3) avoidance of actuator saturation, are captured using the concept of reachable sets and state-space ellipsoids. The proposed approach can potentially achieve the best possible ride comfort by allowing constrained variables free as long as they remain within given bounds. A state feedback solution to the constrained H active suspension control problem is derived in the framework of linear matrix inequality (LMI) optimization and multiobjective control. Analysis and simulation results for a two-degree-of-freedom (2-DOF) quarter-car model show possible improvements on ride comfort, while respecting time-domain hard constraints.

Published in:

IEEE Transactions on Control Systems Technology  (Volume:13 ,  Issue: 3 )