what is an injector

The electronically controlled fuel injector is the most critical and complex component in the common rail system, and it is also the most difficult component in design and process. By controlling the opening and closing of the solenoid valve, the ECU injects the fuel in the high-pressure fuel rail into the combustion chamber with the best fuel injection timing, fuel injection quantity and fuel injection rate. In order to achieve an effective fuel injection starting point and precise fuel injection quantity, the common rail system uses a special fuel injector with a hydraulic servo system and an electronic control element (solenoid valve).

The fuel injector is composed of a hole-type nozzle similar to a traditional fuel injector, a hydraulic servo system (control piston, control metering hole, etc.), a solenoid valve, etc. [1]