“…A hydraulic system is widely used in engineering machinery, transportation, aerospace, and other industrial fields because of its high power density, flexibility, and high stiffness. − The hydraulic system is mainly divided into the pump-controlled hydraulic system and the valve-controlled hydraulic system. The pump-controlled hydraulic system is usually used in high-power scenarios, and its power loss is smaller than that of the valve-controlled hydraulic system. − The axial piston pump in the high-power pump-controlled hydraulic system is not only the main power source of the hydraulic system but also undertakes the responsibility of flow control. , To give full play to the advantages of the pump-controlled hydraulic system, it is an important development direction of the hydraulic variable pump to develop various variable control methods of the variable pump and effectively control pressure, flow, and power. , At the same time, with the development of digital hydraulic technology, the variable control mode of the variable pump has begun to develop in the direction of digitization, intelligence, and networking. The digital controller is used to improve the control performance of the hydraulic variable pump, to better match with the load, achieve the effect of saving energy, realize more functions and higher performance, and improve the competitiveness of the hydraulic transmission system. , …”