What are the components of a high-pressure fuel system?
1 Answers
The components of a high-pressure fuel system include: high-pressure fuel pump, pressure regulator valve, high-pressure fuel rail, high-pressure fuel pressure sensor, fuel injector, and high-pressure fuel lines. The high-pressure fuel pump is driven by a square cam at the intake camshaft end, and the pressure relief valve is integrated inside the high-pressure fuel pump, eliminating the need for a return line from the fuel rail to the low-pressure side. The control principle of the high-pressure fuel pump has changed. During the initial operation of the high-pressure pump, the pressure relief valve remains closed, allowing fuel pressure to directly reach the fuel rail. This design benefits cold starts by enabling faster fuel pressure buildup. The fuel pressure limiter valve, integrated within the high-pressure fuel pump, provides overpressure protection for the system in cases of fuel thermal expansion or malfunctions.