Operation

OPERATION

The ECM monitors the fuel system and measures for pressure vibrations. The ECM will then send a pulse width signal to the quantity control valve to regulate the amount of fuel to the high pressure pump plunger and barrel assemblies. The valve then adjusts the injection correction quantity for each individual cylinder in line with the firing order, there by eliminating the pressure resonance in the fuel rail and improving each independent injectors operation. The fuel quantity valve also interrupts the fuel supply to the high pressure pump plunger and barrel assemblies when the engine is switched off.

The ECM detects the operating state which exists at the engine by means of the sensors. In order to adapt the quantity injected, either the rail pressure can be adjusted by way of the pressure regulator valve and the quantity control valve, or the actuation time of the solenoid valves in the fuel injectors can be extended or shortened.

Fuel quantity control is performed under the following operating conditions:

- Approximately 30 seconds after the engine has started
- Fuel temperature greater then 20° C (68° F)
- Engine not in deceleration mode