In-cylinder direct injection high pressure pump

What are the two solenoid valves of the direct injection high pressure pump in the cylinder?
Used to control the pressure of the common rail, thereby controlling the fuel injection volume. If the solenoid valve does not work normally, the engine will generally not start.
Direct injection in the cylinder of a diesel engine is much simpler. Generally, the fuel pump that does not use any solenoid valve uses at most a flameout solenoid valve. Only the electronic injection diesel engine uses a solenoid valve. The two solenoid valves have the same function to control the common rail pressure. Yes, it’s just because there are two pumps in its high-pressure pump, one solenoid valve controls one pump, and Komatsu’s engine is like this. Direct injection in the cylinder of a gasoline engine is much more complicated. Nowadays gasoline cars almost always inject fuel in the intake pipe. Yes, the technical requirements for direct injection in the cylinder of gasoline engines are very high. It seems that Mercedes-Benz, BMW, and Audi have such cars with direct injection in the cylinder, which are very fuel-efficient.
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