Experimental research on valve-controlled cylinder position servo system based on improved ADRC

The valve-controlled cylinder electro-hydraulic position servo system is a nonlinear systems characterized by uncertain parameters and unknown disturbances. These attributes present significant challenges to achieving high-precision motion control of hydraulic cylinders. This study introduces a composite control strategy that merges active disturbance rejection control (ADRC) with integral feedback to further enhance the position tracking accuracy of the system amid unknown load disturbances. The effectiveness of ADRC largely depends on its parameters, which dictate the control precision of the object. However, ADRC typically involves numerous adjustable parameters, necessitating extended tuning periods for new controlled objects. Consequently, this study proposes a universal method for ADRC parameter tuning aimed at minimizing the time required for parameter adjustments. An experimental platform for the valve-controlled hydraulic cylinder position servo system was developed to validate the efficacy of the control strategy and the parameter tuning method. The findings offer valuable insights for enhancing the motion accuracy of electro-hydraulic position servo systems.