A New Hydraulic Speed Regulation Scheme: Valve-Pump Parallel Variable Mode Control

To improve the comprehensive performances of hydraulic speed regulation systems, this paper proposes and develops a new control scheme, valve-pump parallel variable mode control, which can adopt different control modes in different speed regulation stages and can also adjust the weight ratio between pump control and valve control in the control process. In this paper, we design a hydraulic speed regulation in valve- pump parallel variable mode control, explain its principle, establish the system mathematical model, analyze the system parameters, and build a test system to verify regulation performances. The experimental results show that during the speed adjustment process, the switching between different control modes is smooth, the change rule of proportional valve and variable pump is in accordance with the expectation, and the ratio of valve to pump is reasonable, and the proposed scheme can improve the comprehensive performance of speed governing systems. The valve-pump parallel variable mode control could make full use of advantages of valve control and pump control, and will make hydraulic control systems more flexible and suitable and enrich the current control schemes of hydraulic speed regulation systems.