Discrete Time Sliding Mode Control Strategies for Buffered Networked Systems

In this paper discrete time sliding mode control based methods for networked control systems in the presence of variable time delays and external perturbations are presented. The goal of robustly stabilizing the system is achieved by using a sliding variable of relative degree more than one. One of the two presented methods is based on the switching and the other one on the nonswitching reaching law. The validity of the two new approaches proposed in this paper is mathematically proved by providing and evaluating the width of the quasi sliding mode band. The effectiveness of the proposals is also assessed in simulation with satisfactory results.

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