Perkins 1106C Genset Systems Operation Testing And Adjusting page 24

24
Systems Operation Section
Control
Illustration 27
Electronic control for the fuel system (typical example)
The ECM determines the quantity, timing and
pressure of the fuel in order to be injected into the
fuel injector.
The ECM uses input from the sensors on the engine.
These sensors include the speed/timing sensors and
the pressure sensors.
The ECM controls the fuel pressure by increasing
or decreasing the flow of fuel from the fuel injection
pump. The ECM controls the timing and the flow of
fuel by actuating the injector solenoid.
The amount of fuel is proportional to the duration of
the signal to the injector solenoid.
Fuel Injectors
Illustration 28
The fuel injectors are not serviceable.
When the ECM sends a signal to the injector
solenoid, a valve inside the injector opens. The valve
allows the high pressure fuel from the fuel manifold
to enter the injector. The pressure of the fuel pushes
the needle valve and a spring. When the force of the
fuel pressure is greater than the force of the spring,
the needle valve will lift up.
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