Injectiontime(injectionvolume)

Thefactorstodeterminetheinjectiontimeincludethebasicfuelinjectiontimewhichiscalculatedonthebasisoftheintakeairpressure,enginespeedandthrottleopeningangle,andvariouscompensationswhicharedeterminedaccordingtothesignalsfromvarioussensorsthatdetecttheengineanddrivingconditions.

_{IntakeAirPressureIntakeairpressure}

r------ECM-------,

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_{Sensor(IAPSensor)signalI}^-

I_Basic

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_{CrankshaftPositionEnginespeed}^I_fuel

_{Sensor(CKPSensor)signal}^I_injection

^I_time

^I-

_{ThrottlePositionThrottleooenlno}^I

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^{Sensor(TPSensor)signal}_I

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Various

ISensors

r

Injectors

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^{VarioussignalsI}_{~Compensation-}

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IUltimate

^Ifuel^~Injectionsignal_Iinjection

I_time^-

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COMPENSATIONOFINJECTIONTIME(VOLUME)

Thefollowingdifferentsignalsareoutputfromtherespectivesensorsforcompensationofthefuelinjectiontime(volume).

^{SIGNALDESCRIPTION}

^{ATMOSPHERICPRESSURESENSORSIG-When}atmosphericpressureislow,thesensorsendsthe

^NALsignaltotheECMandreducetheinjectiontime(volume).^{ENGINECOOLANTTEMPERATURESEN-When}enginecoolanttemperatureislow,injectiontime(vol-

^SORSIGNALume)isincreased.

^{INTAKEAIRTEMPERATURESENSORSIG-Whe}nintakeairtemperatureislow,injectiontime(volume)^NALisincreased.

^{BATTERYVOLTAGESIGNALECM}operatesonthebatteryvoltageandatthesametime,itmonitorsthevoltagesignalforcompensationofthefuelinjectiontime(volume).Alongerinjectiontimeisneededtoadjustinjectionvolumeinthecaseoflowvoltage.

^{ENGINERPMSIGNALA}thighspeed,theinjectiontime(volume)isincreased.ThisisthecompensationoftheSAAD.

^{STARTINGSIGNALWhen}startingengine,additionalfuelisinjectedduringcrank-ingengine.

^{ACCELERATIONSIGNAUDuring}acceleration,thefuelinjectiontime(volume)isin-^{DECELERATIONSIGNALcreased},inaccordancewiththethrottleopeningspeedandenginerpm.Duringdeceleration,thefuelinjectiontime(vol-

ume)isdecreased.

Injectionstopcontrol

^SIGNALDESCRIPTION

^{TIPOVERSENSORSIGNALW}henthemotorcycletipsover,thetipoversensorsendsa

^{(FUELSHUT-OFF)signal}totheECM.Then,thissignalcutsOFFcurrentsup-pliedtothefuelpump,fuelinjectorsandignitioncoils.

^{OVER-REV.LIMITERSIGNALT}hefuelinjectorsstopoperationwhenenginerpmreachesrev.limitrpm.

FUELDELIVERYSYSTEM

Thefueldeliverysystemconsistsofthefueltank,fuelpump,fuelfilters,fuelfeedhose,fueldeliverypipe(includingfuelinjectors)andfuelpressureregulator.Thereisnofuelreturnhose.Thefuelinthefueltankispumpedupbythefuelpumpandpressurizedfueltoflowintotheinjectorinstalledinthefueldeliverypipe.Fuelpressureisregulatedbythefuelpressureregulator.Asthefuelpressureappliedtothefuelinjector(thefuelpressureinthefueldeliverypipe)isalwayskeptabsolutefuelpressureof3.0kgf/cm2(300kPa,43psi),thefuelisinjectedintothethrottlebodyinconicdispersionwhentheinjectoropensaccordingtotheinjectionsignalfromtheECM.

Thefuelrelievedbythefuelpressureregulatorflowsouttothefueltank.

_Fueltank

_-

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<--

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!----~.,Fuelmeshfilterr

---(\orlo~pressure)

\~-,Fuelpump

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~Beforepressurizedfuel

•Pressurizedfuel

<~::_·_-_-_;Relievedfuel

FUELPUMP

Theelectricfuelpumpismountedatthebottomofthefueltank,whichconsistsofthearmature,magnet,impeller,brush,checkvalveandreliefvalve.TheECMcontrolsitsON/OFFoperationascontrolledundertheFUELPUMPCONTROLSYSTEM.

Whenelectricalenergyissuppliedtothefuelpump,themotorinthepumprunsandsodoestheimpeller.Thiscausesapressuredifferencetooccurbetweenbothsidesoftheimpellerastherearemanygroovesaroundit.Thenthefuelisdrawnthroughtheinletport,andwithitspressureincreased,itisdischargedthroughtheoutletport.Thefuelpumphasacheckvalvetokeepsomepressureinthefuelfeedhoseevenwhenthefuelpumpisstopped.Also,thereliefvalveisequippedinthefuelpump,whichreleasespressurizedfueltothefueltankwhentheoutletofthefuelpressurehasincreasedupto4.5-6.0kgf/cm2(450-600kPa,64-85

_psi).

Outletport

_Checkvalve^Armature

Whentheimpellerisdrivenbythemotor,pressuredifferentialoccursbetweenthefrontpartandtherearpartofthebladegrooveasviewedinangulardirectionduetofluidfriction.Thisprocesscontinuouslytakesplacecausingfuelpressuretobebuiltup.Thepressurizedfuelisthenletoutfromthepumpchamberanddischargedthroughthemotorsectionandthecheckvalve.

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_Impeller

Motorshaft

Vortexflow

FUELPRESSUREREGULATOR

Thefuelpressureregulatorconsistsofthespringandvalve.Itkeepsabsolutefuelpressureof3.0kgf/cm2

(300kPa,43psi)appliedtotheinjectoratalltimes.

Whenthefuelpressurerisesmorethan3.0kgf/cm2(300kPa,43psi),thefuelpushesthevalveintheregulatoropenandexcessfuelreturnstothefueltank.

_{Fuelfrom--""=""'·}

fuelpump

Fuelfrom.-.E:O:::~~~~'N

fuelpump

Fuelreturnstothefueltank

Valve

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FUELINJECTOR

Thefuelinjectorconsistsofthesolenoidcoil,plunger,needlevalveandfilter.

ItisanelectromagnetictypeinjectionnozzlewhichinjectsfuelinthethrottlebodyaccordingtothesignalfromtheECM.

WhenthesolenoidcoiloftheinjectorisenergizedbytheECM,itbecomesanelectromagnetandattractstheplunger.Atthesametime,theneedlevalveincorporatedwiththeplungeropensandtheinjectorwhichisunderthefuelpressureinjectsfuelinconicdispersion.Astheliftstrokeoftheneedlevalveoftheinjectorissetconstant,thevolumeofthefuelinjectedatonetimeisdeterminedbythelengthoftimeduringwhichthe

_{solenoidcoilisenergized(injectiontime).}

-

Needlevalve_Filter

FUELPUMPCONTROLSYSTEM

Whentheignitionswitchisturnedon,currentfromthebatteryflowstothefuelpumpmotorthroughtheside-standrelayandthefuelpumprelaycausingthemotortoturn.

SincetheECMhasatimerfunction,thefuelpumpmotorstopsturninginthreesecondsaftertheswitchhasbeenturnedon.

Thereafter,whenthecrankshaftisturnedbythestartermotorortheenginehasbeenstarted,theenginerevolvingsignalisinputtotheECM.Then,currentflowstothefuelpumpmotorfromthebatterythroughtheside-standrelayandthefuelpumprelaysothatthepumpcontinuestofunction.

Atipoversensorisprovidedinthefuelpumpcontrolcircuit.Bythisprovision,anytimethemotorcycletipsover,thetipoversensorsendsasignaltotheECMtoturnoffpowertothefuelpumprelay,causingthefuelpumpmotortostop.Atthesametime,currenttothefuelinjectorsaswellastheignitioncoilisinterrupted,

_{whichthenstopstheengine.}

e(±)

BATTERY

30A

IGSWITCH

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ENGINESTOPSWITCH

_{ToStarterbutton}

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SIDE-STANDSWITCH

TOS

ECM(FlCONTROLUNIT)

TheECMislocatedundertheseat.

TheECMconsistsofCPU(CentralProcessingUnit),memory(ROM)and1/0(Input/Output)sections.ThesignalfromeachsensorissenttotheinputsectionandthensenttoCPU.Onthebasisofsignalinformationreceived,CPUcalculatesthevolumeoffuelnecessaryforinjectionusingmapsprogrammedforvaryingengineconditions.Then,theoperationsignalofthefuelinjectionissentfromtheoutputsectiontothefuelinjector.

TheeightkindsofindependentprogrammapsareprogrammedintheROM.

Theseeightkindsofmapsaredesignedtocompensatefordifferencesoftheintake/exhaustsystemsandcoolingperformance.

LIGHTLOAD:Whentheengineisrunninginalightload,thefuelinjectedvolume(time)isdeterminedthebasisoftheintakeairpressureandenginespeed.

HEAVYLOAD:Whentheengineisrunninginaheavyload,thefuelinjectedvolume(time)isdeterminedthe

basisofthethrottlevalveopeningandenginespeed.

FlSYSTEMANDINTAKEAIRSYSTEM4-15