Electronically Controlled Fuel Injector

This is a smart type of fuel injector which is controlled electronically by the electronic control unit of the engine which is also known as brain of modern engines.

Electronically controlled fuel injectors consist of following parts –

Injector body- Same as the mechanically controlled fuel injector the body of this type of injector is a precisely designed hollow shell inside which all the other components are arranged.

Plunger- Same as the mechanically controlled fuel injector a plunger is used for the opening and closing of the nozzle but in electronically controlled fuel injector the opening of the nozzle is controlled electronically with the help of electromagnets.

Spring – Same as the mechanically controlled fuel injector a plunger spring is used to hold the plunger in its position in order to close the nozzle of the fuel injector when required.

Electromagnets – Unlike mechanically controlled fuel injector this type of injector is equipped with electromagnets just around the plunger which controls the opening of the nozzle by taking the electronic signal from the electronic control unit of the engine through the electronic plug or connection connecting the fuel injector with the electronic control unit of the engine.

Electronic plug/connection- At the top end of electronically controlled fuel injector a connection/plug is present through which the electronic signal from the electronic control unit of the engine is transferred to the electromagnets which in turn opens the nozzle in order to spray the fuel.

Working

The fuel pump start pumping the fuel to the fuel injector and the timing, amount and pressure of the fuel entering the fuel injector is governed by the electronic control unit.
The electronic control unit sends the electronic signal to the fuel injector with the help of the electronic connection, due to these electronic signals from the ECU the electromagnets inside the fuel injector got activated which in turn pushes the plunger outward results in opening of the nozzle and finally the spray of the fuel takes place.
After completing this particular cycle the electronic signal from the ECU stops which in turn deactivates the electromagnets due to which the plunger returns to its initial position results in closing of the nozzle and the spray of the fuel stops.
The closing of the nozzle is maintained by the plunger spring.

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