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DI07-16 CHANGED BY EFFECTIVE DATE AFFECTED VIN FUEL SYSTEM DI ENG SM - 2004.4 Y220_07020 Principle of Operation The LP actuator is used to proportion the amount of fuel sent to the pumping element of the HP pump in such a way that • Flow introduced into the HP pump = Injected flow + Injector backleak flow + injector control flow The IMV is normally open when it is not being supplied with fuel. It cannot therefore be used as a safety device to shut The IMV is controlled by current. The flow/current law is represented below. • Engine speed • Flow demand • Rail pressure demand • Measured rail pressure E C U • Inlet Metering Valve (IMV) Piston stroke Diameter of holes Coil resistance Power supply Max. current Weight Operating temperature Fluid temperature Control logic 1.4 mm 3.4 mm 5.4 Ω (at 25°C) Battery voltage (It is prohibited to supply the IMV directly at the battery voltage 1 A 260 g 40°C < T < 125°C 40°C < T < 90°C Normally open without power (The flow decreases as the current rises). • ECU determines the value of the current to be sent to the IMV according to: Specifications Flow (I/hr) Flow / Current Law Current (mA) |