Case IH AXIAL-FLOW 8230 - Fuel Injectors - Dynamic Description Electrical

Engine-Fuelinjectionsystem
Fuelinjectors-DynamicdescriptionElectrical
TheInjectorCylinders1-6L-34throughL-39aresomeoftheoutputdevicesassociatedwiththefuelsystem.These
solenoidsdeliveranaccurateamountoffueltoeachcylinder,byreceivingaPulseWidthModulationPWMsignalfrom
theEngineControlModuleA-01.Foradditionalinformationconcerningthesystem,seeFuelinjectors-Overview-
Fuelactuators(10.218)
SimpliedCircuitDiagram
NHPE11CR00089AA1
Figure1
NOTE:Figure1isasimpliedfunctionaldiagramofthefuelinjectorscircuit.
Atkeyon,A-01willreceivekeyswitchedpowerfromKeySwitchS-02anditsignitioncircuitiscomplete.
Priortotheoperation,thecombineenginemustberunning,the(normallyopencontact)SeatSwitchS-05mustbe
closed,andthe(normallyopencontact)ParkBrakeSwitchS-09mustbeintheONposition.
WhenthecombineengineisrunningtheoperatorcanincreaseordecreasetheenginespeedbyusingtheEngine
ThrottlePotentiometerR-21.Theenginespeedwillincreasebymovingtheleverforwardordecreasebymovingthe
levertotherear.TheRight-HandModuleRHMsendstheenginespeeddatatoCombineControlModule2CCM-12,
usingthesharedCANsignallines.ThenCCM-2usestheenginespeedtocalculatetheamountofairenteringthe
combineandsendsthedatatotheA-01.TheA-01usesthisdatatoadjusttheamountfueltobedeliveredtothe
cylinders.TheA-01alsousesdatafromtheCoolantT emperatureSensorB-44,theEngineCamshaftRPMSensor
B-07,andtheEngineFlywheelRPMSensorB-05.TheB-44isusedtomonitortheenginetemperatureandcalculate
theproperfuelratio.TheB-07isusedtomonitorthecamshaftpositiontodeterminewhichinjectortore.Lastly,the
B-05isusedtomonitorthecrankshaftpositiontodeterminewhichinjectortore.
WhentheA-01hasdeterminewhichinjectortore,itenergizestheinjector'ssolenoidandhighpressurizedfuelwill
begantoowthroughthevalveandsquirtoutthroughthenozzleintothecylinder.
ModuleControlPowerSource
EngineControlUnitA-01
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