This paper describes the design and experimental analysis of a variable structure control (VSC) law using three reaching law strategies for a hydraulic servo control system. For this purpose we use a non-linear mathematical model to develop a stable variable structure force control. The controller is designed using a sliding mode equivalence control and is augmented by a reaching law approach to further improve the performance. Three reaching laws are developed to bring the system states to the sliding mode surface. The feasibility of each reaching law structure on the closed loop performance (i.e. reaching time, chattering and quality of tracking) are experimentally evaluated and analysed.
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Jerouane et al. (2004) studied this question.
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