Where is the injector of mpi injection system installed?

The fuel injector is installed in the throttle body (SPI system) or the intake manifold near the intake valves of each cylinder (MPI system), and is controlled by the fuel injection signal of the electronic controller. The fuel injection quantity is determined by the length of the fuel injector's power-on time, and a proper amount of fuel is injected into the intake manifold in the form of mist.

The fuel injection principle of the fuel injector is that the electric controller sends out a fuel injection current signal, and the current flows through the electromagnetic coil to generate electromagnetic attraction and attract the iron core. Because the needle valve is integrated with the iron core, the metering valve is opened at this time, and the fuel is sprayed by the fuel injector.

The thermostat timing switch and cold start valve (cold start injector) are used to monitor the temperature of cooling water. When the engine is started and the cooling water temperature drops 1 14C, the contacts of the switch are closed.

Inject oil into the cold start valve. The function of the cold start valve is to inject extra fuel into the intake manifold when the engine is cold started, so as to improve the cold start performance. Many cars cancel the temperature saving timing switch, and the work of cold start injector is completely controlled by ECU, which has higher control accuracy.