Discrete Sliding Mode Controller for Pressure Control with an Electrohydraulic Servovalve

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Electrohydraulic servovalves are the most commonly used control devices for hydraulic systems and are difficult to control because they are in essence highly nonlinear. In this study, a discrete time sliding mode controller is designed to control the pressure drop across a load. A nonlinear transformation is pre- sented to convert the system dynamics to a linear state space representation. The performance of the controller is numerically analyzed a n d compared to a classical PID controller.

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