. The so-called * * rail system: used to store high-pressure diesel oil, which is equipped with pressure sensors, pressure fluctuation regulators, fuel injectors and other components) and a high-pressure pump (high-pressure generator). The pressure of the electronically controlled * * * rail and the injection timing of the injector are controlled by ECU.

For the second generation electronic fuel injection system, the unit pump is used to generate the injection pressure of the injector (or injector). For engines with electronically controlled fuel injection system with unit pumps, each cylinder has several unit pumps.