Sliding mode control for electro‐hydraulic proportional directional valve‐controlled position tracking system based on an extended state observer
Huixuan Zhuang, Qinglin Sun, Zengqiang Chen
Abstract
Abstract A novel method combining the sliding mode control (SMC) and extended state observer (ESO) is proposed for position control of an electro‐hydraulic servo system (EHSS), which is nonlinear in mechanical dynamics. Based on the SMC technique, the corresponding sliding mode controller is designed to guarantee the state variables of the closed‐loop system to converge to the reference state by applying an ESO to estimate external disturbances and the internal dynamics. Also, simulation results are presented to illustrate the effectiveness of the control strategy; synchronously, SMC can achieve better control performance than proportional integral derivative (PID) method in comparison with the PID control approach.