Liu Y., Yang B., Wu Z., Chen M., 2015, Experimental Study on Closed Loop Simulated Loading of Proportional Relief Valve, Chemical Engineering Transactions, 46, 1153-1158.
Proportional relief valve is usually used in the hydraulic experimental platform to simulate the load. The open- loop simulated loading has the characteristics of exiting steady-state error and control accuracy easily being affected by the flow disturbance input, so the pressure closed-loop PID control system is designed in this paper. With adjusting the proportion of the valve orifice area to lessen the differences between target pressure and pressure signal sensor measured, the system can correct real-time the actual pressure to target set value. Experimental results showed that: The dynamic response of pressure closed loop control is fast and anti- interference ability is strong; the steady state error can be eliminated with the signal of the step flow disturbance; For the flow of the sinusoidal and the slope of the interference signal, the system can make the actual pressure value fluctuations in the set point and has strong error correction capability.
