Inlet Metering Valve (Imv) - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

DI07-14

INLET METERING VALVE (IMV)

IMV effect
Torque (Nm)
Rail pressure = 80 bar
Fuel temperature at
system backleak
Torque (Nm)
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
Overview
The LP actuator, also called the inlet metering valve, is used
to control the rail pressure by regulating the amount of fuel
which is sent to the pumping element of the HP pump.
This actuator has two purposes:
Y220_07027
1. Firstly, it allows the efficiency of the injection system to
without IMV
with IMV
Y220_07028
2. Secondary, it allows the temperature to be reduced in
without IMV
with IMV
Y220_07029
be improved, since the HP pump only compresses the
amount of fuel necessary to maintain in the rail the level
of pressure required by the system as a function of the
engine's operating conditions.
the fuel tank. When the excess fuel is discharged into
the back leak circuit, the pressure reduction in the fluid
(from rail pressure down to atmospheric pressure) gives
off a large amount of heat. This leads to a temperature
rise in the fuel entering the tank. In order to prevent too
high a temperature being reached, it is necessary to limit
the amount of heat generated by the fuel pressure
reduction, by reducing the back leak flow. To reduce the
back leak flow, it is sufficient to adapt the flow of the HP
pump to the engine's requirements throughout its
operating range.
FUEL SYSTEM
DI ENG SM - 2004.4