This study addresses the high-precision position control problem of pilot-operated proportional directional valves under dead-zone nonlinearity. A fuzzy PID-based position control strategy optimized by the dung beetle optimizer (DBO-FPID) is proposed to alleviate switching lag and accuracy degradation caused by dead-zone effects. First, a refined nonlinear model combining theoretical analysis and AMESim simulation is established to quantitatively characterize the dead-zone evolution mechanism of the valve system, and the dead-zone range of the directional valve is identified as ±34.5% of the duty cycle. On this basis, a multiphysics co-simulation model is developed to analyze the static and dynamic characteristics of the pilot valve and the main spool. Then, the DBO algorithm is introduced to optimize the key parameters of the fuzzy PID controller by minimizing an objective function based on the integral of time-weighted absolute error (ITAE), thereby improving the controller’s compensation capability for dead-zone nonlinearity. Simulation results show that, compared with DBO-PID, the proposed DBO-FPID control strategy reduces the rise time by 54.4%. During triangular and sinusoidal position tracking, the dead-zone residence time is reduced by 47.5% and 44.8%, respectively, while the mean absolute error remains below 0.2 mm. Experiments further validate the effectiveness of the proposed control strategy for high-precision position control of the pilot-operated proportional directional valve.
Guo et al. (Tue,) studied this question.
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