Brief introduction:

The injector nozzle itself is a normally closed valve (a normally closed valve means that when there is no input control signal, the valve is always in a closed state; while a normally open valve means that when there is no input control signal, the valve is always in an open state), and a valve needle moves up and down to control the opening and closing of the valve. When the ECU issues an injection command, its voltage signal will cause current to flow through the coil in the injector nozzle, generating a magnetic field to attract the valve needle, allowing the valve to open so that the fuel can be sprayed out from the injection hole. The biggest advantage of injection fuel supply is that the fuel supply is controlled very accurately, so that the engine can have the correct air-fuel ratio in any state, not only keeping the engine running smoothly, but also its exhaust gas can meet the standards of environmental regulations.