Research on Feedback-Linearized Sliding Mode Control of Direct-Drive Volume Control Electro-Hydraulic Servo System

• Published in: Processes Vol. 9; no. 9; p. 1676
• Main Authors: Chen, Gexin, Jia, Pengshuo, Yan, Guishan, Liu, Huilong, Chen, Wenbin, Jia, Chunyu, Ai, Chao
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.09.2021
• Subjects: Accuracy; Algorithms; Control algorithms; Control systems; Control theory; Controllers; Design; Dynamic response; External pressure; Feedback; Feedback linearization; Hydraulics; Lithium; Mathematical analysis; Mathematical models; Parameter identification; Proportional integral derivative; Servocontrol; Sliding mode control; Uncertainty; Variable structure control; Volume controls
• ISSN: 2227-9717; 2227-9717
• DOI: 10.3390/pr9091676

In this paper, a control strategy combining the feedback linearization theory and sliding mode variable structure theory is proposed to solve various nonlinear factors, uncertainty of external disturbance and high-precision pressure control problems in the Direct-Drive Volume Control (DDVC) electro-hydraulic servo system. The nonlinear mathematical model of the DDVC electro-hydraulic servo system is established, and the nonlinear factors in the system are accurately linearized by the feedback linearization theory. The uncertainty of external disturbance in the system is compensated by the sliding mode control variable structure theory. The feedback-linearized sliding mode control algorithm proposed in this paper is verified using the DDVC electro-hydraulic servo system experimental platform. The experimental results show that, compared with the classical PID control, the proposed control algorithm can effectively improve the pressure output precision, as well as the dynamic response characteristics, of the DDVC system.