Incomplete state feedback control of Electro-Hydraulic Servo System using second order sliding modes

This paper presents control of a typical Electro-Hydraulic Servo System (EHSS) using measurable outputs. Detailed modeling of EHSS is described which takes into account the nonlinearities of solenoid coil, hydraulic pressures and spool motion. Two different controllers are proposed using two different surfaces. The two surfaces considered are finite time converging and asymptotically converging respectively. Second order sliding mode approach is used to device the control laws. The method is validated in simulation. Comprehensive comparison of the two controllers is presented.

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