Diesel vehicle fuel injection control is divided into two types: electronic control and mechanical. 1. Electronic control: includes common rail electronic control systems and electronically controlled plunger fuel injection pumps. In common rail electronic control systems, the injector's fuel injection quantity is controlled by the computer board. In electronically controlled plunger fuel injection pumps, the computer board controls whether the fuel injection pump delivers fuel, and the injector opens based on fuel pressure. 2. Mechanical: Mechanical injectors open based on the fuel pressure output by the fuel injection pump. Below is relevant information about automotive fuel injectors: 1. Automotive fuel injector: It is a simple solenoid valve. When the electromagnetic coil is energized, it generates suction, lifting the needle valve to open the injection hole. Fuel is sprayed at high speed through the annular gap between the needle valve head's spindle and the injection hole, forming a mist for better combustion. 2. Function: To inject fuel into the engine. From the fuel path perspective, first, the fuel pump delivers fuel from the tank to the fuel delivery pipe, which then sends the fuel to the fuel rail. The fuel rail uses a pressure regulator to control fuel pressure and ensure uniform pressure to each cylinder. Additionally, the pressure regulator sends excess fuel back to the tank via the return line by releasing pressure.
