Pump Assembly Injection

The high-pressure oil pump is the core component of the fuel injection system. Its main function is to transport fuel from the fuel tank to the fuel injector and provide sufficient pressure to ensure that the fuel can be injected into the combustion chamber at the right time and in quantity, so as to achieve efficient combustion and power output. 

 The high-pressure oil pump is driven by the engine, and the camshaft drives the rotor of the oil pump to rotate, causing negative pressure in the pump cavity inside the rotor, thus sucking fuel from the fuel tank. In this process, the downward movement of the pump piston provides power for oil absorption. At the same time, the oil inlet valve opens and the fuel is sucked into the pump chamber. At the end of the pump piston stroke, the fuel pressure regulating valve is energized, so that the oil inlet valve is still open in the initial stage of the upward movement of the pump piston in order to return the oil. 

 In order to control the actual oil supply, in the initial stage of the upward movement of the pump piston, the oil inlet valve is still open, and the excess fuel is pushed back to the low-pressure end by the pump piston. This process helps to maintain the pressure balance in the system and prevent system damage caused by excessive pressure. 

 At the beginning of the oil pumping stroke, the fuel pressure regulating valve is cut off, so that the oil inlet valve closes under the joint action of the pressure rise in the pump cavity and the closing spring in the valve. The pump piston goes up to generate pressure in the pump cavity. When the pressure exceeds the pressure in the oil track, the oil outlet valve is opened and the fuel is pumped into the oil track. This process ensures that the fuel can be transported to the fuel injector in a high-pressure state to achieve efficient fuel injection.