Dual Pump Source Flow Control System Based on Pump Leakage Model
At present,when the complex collaborative flow control system of hydraulic pump valves switches between flow control mode and pressure control mode,due to overcurrent matching,the system will generate pressure shock and energy loss.In order to solve this problem,based on the pump leakage model,a dual pump source flow control system consisting of an internal gear quantitative pump with servo motor as the power source and an electro-hydraulic proportional variable pump dragged by a three-phase synchronous motor was proposed.The joint simulation model of AMESim and Simulink was established for the dual pump source flow control system based on the pump leakage model,and the new control strategy was verified.The results show that the dual pump source flow control system with the servo motor-driven internal gear pump as the compensating pump reduces the pressure shock by 30.7％,and the flow fluctua-tion is reduced by 58.3％.When switching from fast mode to micro mode,the time taken for mode switching is reduced by 62.5％.When a sudden change in load occurs,the fast mode can effectively compensate for system leakage and the flow fluctuation of the system is re-duced by 2.68％.At micro mode,the system's flow fluctuations reduce by 10.86％,which improves the speed stability compared to tradi-tional pump valve collaborative pressure flow composite hydraulic control systems.
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