Abstract:Aiming at the safety and reliability of the oil source in the hydraulic system, an oil source redundancy design method is proposed. In the case of multiple oil sources supplying multiple loads, the energy selection valve cuts off the failed oil source when it fails, and other oil sources provide basic hydraulic energy to the load, so that the system can complete the necessary service performance. To help address the problems of the frequent reversing and vibration of the hydraulic system energy selection valve, a cartridge hydraulic control energy selection valve is proposed. The pilot valve adopts a poppet valve and a variable damping structure, and the main valve adopts a sliding valve structure with three shoulders and a buffer function at the end. The mathematical model of the cartridge hydraulically controlled energy selection valve is built which analyses the switching pressure, switching time, and oil source pressure pulsation of the energy selection valve under two types of simulated malfunction. Theoretical analysis results show that the switching time of a certain energy selection valve is 5 ms and 7 ms respectively when there is a step and linear change in the oil source pressure. When the pressure fluctuates, the main valve will not vibrate, and the switching pressure and return pressure can also be controlled through the structural design of the hydraulic pilot valve.