Research on Control of Hydraulic Position Tracking System Based on Event Triggering and Disturbance Observer

An electro-hydraulic servo system based on network control technology has the advantages of remote control, modularisation, and resource sharing. However, the electro-hydraulic servo system itself has the characteristics of strong nonlinearity and parameter uncertainty, combined with the limited communication bandwidth of the network control system, which leads to a poor control effect and limits its application. To solve the above problems, an event-triggered mechanism is introduced to filter redundant data and conserve the communication bandwidth, while a backstepping sliding mode control strategy integrating this event-triggered mechanism with a jamming observer is proposed. A model-based disturbance observer is designed to mitigate external interference effects on system control performance while enhancing robustness and disturbance response capabilities. The global stability of the closed-loop system is analysed using Lyapunov stability theory. The experimental results show that the system displacement tracking error of the controller designed in this paper can reach ±0.001 rad, and the system can reach stability in about 0.5 s. At the same time, it can significantly reduce the amount of data transmission, which effectively solves the problem of the network bandwidth limitation.