Investigation the load matching of direct pressure valve controlled variable mechanism of axial variable piston pump

In order to improve the control performance of loading sense pump controlled system, a direct pressure valve is proposed in the present study to control the displacement actively. The valve is utilized to control the pressure feedback to the variable mechanism. The direct pressure valve can keep the advantage of high efficiency of loading sense system and high dynamic performance of constant pump simultaneously. The design of the structure of direct pressure valve is presented. Then, the load matching of the variable mechanism with the valve is studied. The design parameters are optimized. The simulation results indicate that direct pressure control valve is suitable for the system.