Research on Dynamic Response Characteristics Modeling and Adaptive Control Strategy of Electro-hydraulic Proportional Valves

Electro-hydraulic proportional valves are critical components in high-precision industrial control systems, where nonlinear dynamics, hysteresis effects, and time-varying disturbances significantly affect control accuracy and system stability. To address these challenges, this study proposes a data-enhanced dynamic-response modeling framework and an adaptive sliding-mode control strategy. A hybrid modeling approach integrating mechanism-based analysis and experimental data fusion is established to characterize nonlinear coupling among electromagnetic force, hydraulic pressure, and spool displacement. An adaptive sliding-mode controller with online gain adjustment is further developed to improve disturbance rejection and parameter adaptation. Simulation and experimental results demonstrate significant reductions in rise time, overshoot, and steady-state error compared with conventional PID control. The framework provides an effective solution for nonlinear system modeling and intelligent control in industrial automation environments.