To solve the problem that the traditional PID control strategy does not fit for the characters of strong nonlinearity, a large range of parameters perturbation and the existence of uncertain outside disturbances, a sliding mode controller based on proportional switching function was designed. The control effects on rotation speed of secondary regulation hydraulic system under a constant pressure, respectively by PID controller and by sliding mode controller were compared. The results showed that the hydraulic system's responding speed and robustness were both improved obviously after using the sliding mode controller, which proved the proposed sliding mode control was valid for secondary regulation hydraulic system's speed control.
['Xin Wang', 'Wei Chen', 'Ancai Yu']
Sliding mode rotation speed control on secondary regulation hydraulic system