Simulation Study of Digital Directional Valve Position Loop Control Based on Improved Convergence Rate of Sliding Mode Variable Structure

doi:10.3901/JME.2025.24.311

Abstract

Abstract: Aiming at the problems of the characteristics of the digital directional valve drive system that is too sensitive to the change of the drive motor parameters, not strong in load disturbance resistance, and the insufficiency of the traditional P-control in high-precision position control, which seriously affects the control accuracy and stability of the digital directional valve drive system, the sliding-mode variable-structure composite control strategy with an improved convergence rate is proposed. In order to meet the demand of high-precision position control, in this strategy, the anti-interference and parameter time-variation of sliding mode control are utilized, and the combination of sliding mode control, predictive adaptive control and optimal control is used to design a position-loop controller for the digital directional valve, which realizes the high precision and fast response of the system. Simulation and experimental results show that the proposed position loop control strategy effectively improves the stability and accuracy of the system, as well as its effectiveness in improving the system's anti-interference capability, when analyzed in comparison with the traditional P control. This study is of great significance for improving the performance of digital directional valves and provides theoretical guidance for the control strategies of similar systems.

Key words: digital directional valves, sliding mode control, optimal control, sliding mode surface, convergence rate optimization

CLC Number:

TH137

WANG Xiaojing, ZHANG Yuxuan, ZHANG Yang. Simulation Study of Digital Directional Valve Position Loop Control Based on Improved Convergence Rate of Sliding Mode Variable Structure[J]. Journal of Mechanical Engineering, 2025, 61(24): 311-325.

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