Electrohydrostatic actuator (EHA) is a new actuator for next generation aircraft actuation system. This actuator is essentially a\nnonlinear system; response speed and accuracy are the main consideration.We use sliding mode control for this nonlinear system\nin this paper. The variable structure filter (VSF) is introduced to obtain the unmeasured states. Derivation of the VSF gain based\non the reaching law is presented in this paper. To improve the response speed and accuracy, a nonlinear function is introduced to\nconstruct the nonlinear sliding surface using the estimated states generated by VSF. Simulation results show that low settling time\nand quick response are obtained by using the nonlinear sliding surface.
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