Active Disturbance Rejection Control of Position Control for Electrohydraulic Servo System

Electrohydraulic servo systems (EHSS) have been widely used in industries, especially for efficiently handling heavy loads. The purpose of this paper is to present a trajectory tracking of position control strategy which uses a closed-loop controller for EHSS system to synchronize the actual and desired positions. Generally, the PD controller is utilized extensively to control the EHSS, but the tracking performance of this approach is limited due to the nonlinear dynamics of EHSS. To achieve better control performance, the active disturbance rejection control (ADRC) is used in this paper to eliminate the nonlinear disturbance for EHSS. The simulation results show that the presented controller gains better tracking performances, such as less tracking lag and less mean absolute error (MAE), when compared with the PD controller.