2002 · ENGINE AND EMISSION CONTROL [17] · страница 3 из 8 · Открыть оригинал PDF ↗

EXHAUSTGASRECIRCULATION(EGR)SYSTEM<4D5-stepIII>

GENERALINFORMATION

Theelectronically-controlledEGRsystemconsists
ofanEGRvalve,avacuumpump,EGRsolenoid
valvesNos.1and2,EGRvalvepositionsensor
andengine-ECUandvarioussensors.
TheEGRvalveiscontrolledbythenegative
pressureinsidethevalve,whichiscontrolledby
EGRsolenoidvalvesNos.1and2.
InordertoobtainEGRamountcorrespondingto
eachoperatingcondition,theappropriateopening
oftheEGRvalveiscalculatedbasedontheinput
signal from each sensor.

FeedbackcontroloftheEGRsolenoidvalvesNo.
1andNo.2operationiscarriedoutbasedonthe
signalfromEGRvalvepositionsensorsothatthe
openingoftheEGRvalvecanbequicklyadjusted
tothetargetangle.

Inthisway,theEGRiscontrolledtoreduceNOx
emissionswhilemaintaininggoodengine
performance.

SYSTEMDIAGRAM

COMPONENTLOCATION

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