Parametric Synthesis of Electrohydraulic Control System for Variable Displacement Pump

The article presents a scheme of an electric-hydraulic control system for a pump. The control system enables the pump to operate in one of four modes: constant flow, constant pressure, constant power, flow, and pressure compensation. The choice of mode depends on the program implemented by the controller. Experimental studies of the controller and the electromagnetic amplifier have been carried out. The transfer functions of the electromagnet amplifier were determined. Work processes in the system were studied based on the developed mathematical model in the MATLAB-Simulink environment. A comprehensive criterion for evaluating the efficiency of the system has been developed. The criterion includes adjustment time, the amount of pressure overshoot, and power losses in the control system. At the determined value of the efficiency criterion, the pump has an adjustment time of tp = 0.44 s, pressure overshoot σ = 22%, and power losses in the control system do not exceed Np = 1.82 kW.