Engine-Fuelinjectionsystem
Commonrail-Overview
NHIL13ENG0993EA1
(1)Fuelreturn(3)Pressuresensor(5)Rail
(2)Pipelinestoinjectors(4)Fuelsupply(6)Overpressurevalve
Thecommonrailhasaninternalvolumesizedtoquicklypressurizethefuelatstartup,whilehavingasufcientvolume
tosupportfullloadfuellingrates.Thevolumeinthecommonrailissufcienttoallowtheinjectorstosupplyfueltothe
cylindersunderfullload,whilestillmaintainingastabilerailpressure,fromfuelsuppliedbythehighpressurepump.
Afuelpressuresensor(3)isscrewedintotheoneendofthecommonrail.Itprovidesfeedbacktotheengineelectronic
controlunitwherethesensorvaluesaremonitored.Railpressureischangedasneededbasedonsensorfeedback
andotherengineoperatingparameters.
Anoverpressurevalve(6)isinstalledintheotherend.Itprotectsthecommonrailandassociatedcomponentsby
exhaustingexcesspressureintherailtothereturnlineandbacktothefueltank.Itopensatabout1850–1950bar
(26825–28275psi).
4804083715/08/2017
10.3[10.218]/6
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