Delay-range-dependent H∞ control for sampled-data active suspension system

摘要

This paper presents an input delay approach to solve the digital sampling control problem of the active suspension system. By studying an input delay method, the active suspension system with both continuous-time signal and discrete-time signal is converted to a continuous-time system with time-varying delay. In order to reduce the conservativeness, the information of the lower bound of delay is taken into account, and a Lyapunov function which contains the range of delay is constructed to establish the H-infinity performance. Besides, the input constraint is considered to avoid output saturation. The sufficient conditions for delay-range-dependent stabilization are derived in terms of LMI, and the controller is also obtained. A quarter-car model is considered in this paper and the effectiveness of the proposed approach is illustrated by a realistic design example.