Design and Implementation of PLC-Based Closed-Loop Control Strategy for Hydraulic Systems
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Abstract
This paper addresses the issues of insufficient control accuracy and decreased stability in hydraulic systems, where fluctuating loads and nonlinear characteristics often compromise positioning precision in high-speed industrial applications. As modern intelligent manufacturing increasingly depends on electromagnetic sensing and reliable industrial signal transmission, robust closed-loop control architectures are essential for ensuring stable real-time operation. A PLC-based closed-loop control strategy is therefore designed and implemented. First, a hardware control platform is constructed by integrating a programmable logic controller (PLC) with sensors for real-time monitoring of oil pressure, flow rate, and displacement signals. A digital PID control algorithm is then developed, with parameter tuning and optimization performed using a hydraulic system model, followed by implementation of the closed-loop logic through PLC programming and system debugging. Experimental results show that the proposed system achieves a steady-state error of 0.15 mm, an overshoot of 4.55%, and a settling time of 0.518 s under step response testing. Under a 500 N step load disturbance, the maximum dynamic deviation remains below 0.72 mm and the recovery time does not exceed 0.45 s. These results demonstrate that the PLC-based strategy significantly improves control precision, dynamic response, and disturbance rejection capability, providing an effective solution for high-reliability hydraulic actuation while offering valuable references for electromagnetic sensing-assisted industrial automation and intelligent motion control.
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