Injectiontiming

Thesystememploysasequential,four-cylinderindependentinjectiontype,usingthecrankshaftpositionsensor(signalgenerator)todeterminethepistonposition(injectiontimingandignitiontiming)andthecamshaftpositionsensortoidentifythecylinderduringoperation,andtheseinformationaresenttotheECM.Thismakesitpossibletoinjecttheoptimumvolumeoffuelinthebesttimingfortheengineoperatingconditions.

Whenthecrankshaftbeginstoturnatthetimeofstarting,theECMsendsthesignalstothefourinjectors,

#1,#2,#3and#4tohavetheminjectfuelsimultaneously.Fromthesecondturnonward,thesequentialfour-cylinderindependentinjectionoccursasexplainedabove.

CKPsensorsignal

vu

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#1cy.

^EXPAN_EX^{INCOMPEXPANEXINCOMPEXPANEXIN}

Ignitiontiming

CMPsensorsignal

#2cy.

COMP

EXPAN

EX

IN

COMP

EXPAN

EX

IN

COMP

EXPAN

EX

#3cy.

EX

JN

COMP

EXPAN

EX

IN

COMP

EXPAN

EX

IN

COMp

#4cy.

IN

COMP

EXPAN

EX

IN

COMP

EXPAN

EX

IN

COMP

EXPAN

I

_~

_~^c;"l)_~

₁

^G~~

_~1

^G~~G~

Injector

#1

#2

#3

#4

Crank

Starting_I~~

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^angleoo

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_720°

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I 180°	360°	I

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Turning0

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^T.D.C.

(#1)

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5TURNS

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SENSORS

INTAKEAIRPRESSURESENSOR(IAPSENSOR)

Theintakeairpressuresensorislocatedattherearsideoftheaircleanerboxanditsvacuumhoseisconnectedtothethrottlebody.

Thesensordetectstheintakeairpressure,whichisthencon•

vertedintovoltagesignalandsenttotheECM.

Thebasicfuelinjectiontime(volume)isdeterminedaccordingtothevoltagesignal(outputvoltage).

_{Thevoltagesignalincreaseswhentheintakeairpressureishigh.}

^{.--------------------------~}

^{Outputvoltage}

s:(V)

_Cl

_i:

~I

...J...

Intakeairpressure(mmHg)

Low--------High

-

(Highvacuum)(Lowvacuum)

THROTTLEPOSITIONSENSOR(TPSENSOR)

ThethrottlepositionsensorisinstalledontheNo.4throttlebody.Thethrottlepositionsensorisakindofvariableresistorwhichdetectsthethrottleopeningangle.

Thebatteryvoltageinthesensorischangedtothethrottleposi•

tionvoltagewhichisthensenttotheECM.

Thebasicfuelinjectiontime(volume)isdeterminedaccordingtothevoltagesignal(outputvoltage).

Thevoltagesignalincreasesasthethrottleisopenedwider.^-

Outputvoltage

(V)

_s:

Cl

_r

_{~Throttlevalve}

--1.

opening(Degree)

Small-------Large

CRANKSHAFTPOSITIONSENSOR(CKPSENSOR)

Thesignalrotorismountedontherightendofthecrankshaft,andthecrankshaftpositionsensor(Pick-upcoil)isinstalledontherightsideofthemiddlecrankcase.

Thesensorgeneratesthepick-upsignaltobesuppliedtothe

ECM.

TheECMcalculatesanddecidesboththefuelinjectiontimingandignitiontiming.

_{Theinjectionvolumeincreaseswhentheenginerpmishigh.}

CAMSHAFTPOSITIONSENSOR(CMPSENSOR)

Thesignalrotorisinstalledontheintakecamshaft,andthecam•shaftpositionsensor(Pick-upcoil)isinstalledonthecylinderheadcover.

Thesensorgeneratesthepick-upsignaltobesuppliedtothe

ECM.

TheECMcalculatesanddecidesthecylinderidentityandse•

quentialinjectiontiming.

^Iw_I

_CMPsensor^Signalrotor

INTAKEAIRTEMPERATURESENSOR(IATSENSOR)

Theintakeairtemperaturesensorisinstalledattherightsideoftheaircleanerbox.

Thesensordetectstheintakeairtemperatureinthermistorresis•tancevalue.Withthisresistancevalueconvertedtovoltagesig•nal,thesignalissenttotheECM.Theinjectionvolumeincreases

asintakeairtemperaturedecreases.

Thethermistorresistancevalueincreaseswhentheintakeairtemperatureislow,anddecreaseswhentheintakeairtempera•tureishigh.

Resistancevalue

_(kQ)

Thermistor

_s:

_O>

I

₁

.^s3^:

L_

Low-High

(°C)

Temperature

ENGINECOOLANTTEMPERATURESENSOR(ECTSENSOR)Theenginecoolanttemperaturesensorisinstalledattherear

^{sideofthecylinderhead.}

Thesensordetectstheenginecoolanttemperatureinthermistorresistancevalue,whichisthenconvertedtovoltagesignalandsenttotheECM.Theinjectionvolumeincreasesascoolanttem•

_{peraturedecreases.}

Thethermistorresistancevalueincreaseswhentheenginecool•anttemperatureislow,anddecreaseswhentheenginecoolanttemperatureishigh.

ATMOSPHERICPRESSURESENSOR(APSENSOR)

TheatmosphericpressuresensorislocatedovertheECM.

Thesensordetectstheatmosphericpressure.Thedetectedpres•

sureisconvertedintovoltagesignalandsenttotheECM.

Theinjectiontime(volume)iscontrolledaccordingtothevoltagesignal(outputvoltage).

_{Thevoltagesignalincreasesastheatmosphericpressurerises.}

Resistancevalue

(kQ)

,

Outputvoltage

s:(V)

₀₎

l

J:

_~Atmospheric

.

_{Low--------High}

pressure(mmHg)

(Highvacuum)(Lowvacuum)

...,

TIPOVERSENSOR(TOSENSOR)

Thetipoversensorislocatedinaheadofthebatteryholder.Thesensordetectstheleaningofthemotorcycle.Whenitleansmorethan43°,themechanicalswitchturnsONandasignalissenttotheECM.Atthesametime,thissignalcutsOFFcurrent

_{supplytothefuelpump,fuelinjectorsandignitioncoils.}

SECONDARYTHROTTLEPOSITIONSENSOR(STPSENSOR)ThesecondarythrottlepositionsensorisinstalledontheNo.4throttlebody.

Thesecondarythrottlepositionsensorisakindofvariablere•

sistorwhichdetectsthesecondarythrottleopeningangle.

TheSTPsensordetectstheSTVactuatormovementbythevolt•

agesignalwhichisthensenttotheECM.

TheECMdeterminestheSTvalveanglebasedontheopera•

tionmap.

Thevoltagesignalincreasesasthesecondarythrottleisopened

wider..-----=o-ut-pu-t-vo...,.lt-ag-e---------------.

(V)

i

_.I:.

Ol

~ Throttlevalveopening(Degree)

-1.

Small-------·Large