Analysis of load-independent control gear pump loading characteristics

This study investigates the simulation of real-world load conditions under indoor experimental setups to enhance hydraulic system performance. An electromagnetic proportional relief valve is employed to control the loading gear pump as part of the loading system. Using LabVIEW programming software, a pump-controlled motor hydraulic test bench achieves simulated loading, enabling pressure simulation for variable-speed pump-controlled motor hydraulic systems. To address drawbacks such as steady-state error, overshoot, and hysteresis in the open-loop loading system, a PID (Proportional Integral Derivative,PID)-based pressure closed-loop loading control module is designed and implemented. Results demonstrate that the closed-loop loading system effectively mitigates the steady-state error, overshoot, and hysteresis of open-loop loading. While open-loop loading exhibits good rapidity through typical step, sinusoidal, and ramp flow disturbances, the results show that pressure closed-loop loading exhibits good accuracy and stability. By utilizing an electromagnetic proportional relief valve for controlling the loading gear pump, this study successfully achieves simulation-based loading control for variable-speed pump-controlled motor systems. The findings provide a reliable theoretical foundation for developing loading technologies capable of simulating real-world load conditions.