Fuel Injector: Description and Operation

GEMS Fuel Injector:

FUEL INJECTORS

The electronically operated fuel injector provides a simple and effective way of metering the fuel provided for combustion.

The Fuel Injectors contain an internal disc that allows fuel to pass when the solenoid is energized.

Injector Pulse Width:

The length of time the injector is energized and delivering fuel is referred to as injector "pulse width. This varies between 1.5 to 10 milliseconds, depending on operating conditions. The longer the injector is energized, the greater the volume of fuel delivered. The ECM uses the duration of its ON signal to the injector (where it provides a ground for the injector circuit) to control fuel delivery to the cylinder.

Atomized Fuel:

To further enhance the combustion process, the tip of the injector's needle valve is precision ground to a shape that produces a fine atomized fuel spray. This enables the fuel to vaporize faster and more completely than fuel introduced by a carburetor. The result is more complete and efficient combustion.

As long as the supply of fuel to the injector is sufficient, the volume of fuel delivered can be precisely controlled by the length of time the injector needle valve is open. The valve remains open as long as a path to ground is provided by the ECM.