Fuel injector, a device that injects fuel into the engine cylinder. In fact, it is a simple solenoid valve. When the solenoid coil is energized, suction is generated, the needle valve is sucked up, opening the nozzle hole, and the fuel is sprayed at high speed through the annular gap between the needle and the nozzle hole on the needle valve head, forming fog Shape, conducive to full combustion.

The injector itself is a normally closed valve (normally closed valve means that when no control signal is input, the valve is always in the closed state; while the normally open valve is when no control signal is input, the valve is always in the open state, and a The valve needle moves up and down to control the opening and closing of the valve. When the ECU issues a fuel injection command, its voltage signal will cause current to flow through the coil in the fuel injection nozzle, generating a magnetic field to suck up the valve needle, allowing the valve to open so that the fuel can be Eject from the fuel injection hole. The biggest advantage of fuel injection is that the control of fuel supply is very accurate, so that the engine can have the correct air-fuel ratio in any state, not only to keep the engine running smoothly, but also to comply with environmental regulations. specification.