Research on electro-hydraulic position servo control strategy of the coil car
WANG Wenkang
FAN Haifeng
YU Hongjie
LYU Yangyang
SHAO Jiajun
WANG Hanqing
WANG Yajing
Abstract：In response to the high-precision control requirements of the electro-hydraulic position servo system for the coil car in the steel industry,a composite control strategy of sliding mode control and Linear Extended State Observer(LESO)is proposed to solve the problem of insufficient control accuracy of PID controller in nonlinear and multi operating conditions.By establishing the mathematical model of the valve-controlled cylinder and designing the sliding mode control and Linear Extended State Observer,the system disturbances and state variables are estimated in real time.The results show that under multiple working conditions of the sliding mode+LESO control strategy with the weight of 10-30 t steel coils and the target displacement of 500-1 200 mm,the control accuracy decreases with the increase of load and displacement.However,the absolute deviation of the actual displacement is less than 0.003.It can effectively suppress the chattering and adapt to complex working conditions,and the control effect is significantly better than PID control.It has stronger robustness.
Keywords：the coil carelectro-hydraulic position servo systemsliding mode controllinear extended state observer
Publication Date：2025-09-20
Online Publishing Date：2025-10-28(First online date of this platform, not the publication date of the document)
Pages：8( 80-87 )