电控发动机点火系统 EFI ignition system.pdf

《电控发动机点火系统 EFI ignition system.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、EFI#4-TCCSIGNITIONSYSTEMTheEFI/TCCSIgnitionSystemOverviewofToyotaEFI/TCCSIgnitionControlTheignitionsystemsusedontoday'sThemostsignificantdifferencebetweenEFI/TCCSequippedenginesarenotthatTCCSandConventionalEFIignitionsystemsmuchdifferentfromtheigniti

2、onsystemusedisthewaysparkadvanceangleismanaged.ontheoriginal4M-EEFIengine.PrimaryTheConventionalEFIsystemusescircuitcurrentflowiscontrolledbyanignitermechanicaladvanceweightsandvacuumbasedonsignalsgeneratedbyamagneticdiaphragmstoaccomplishthis.Starti

3、ngwithpickup(pickupcoil)locatedinthedistributor.the5M-GEenginein1983,theTCCSsystemcontrolsignitionsparktimingelectronicallyTheignitionsystemhasadualpurpose,toandaddsanignitionconfirmationsignalasadistributeahighvoltagesparktothecorrectfail-safemeasur

4、e.cylinderandtodeliveritatthecorrecttime.IdealignitiontimingwillresultinmaximumTherearetwoversionsofelectronicsparkcombustionpressureatabout10'ATDC.managementusedonTCCSequippedengines,theElectronicSparkAdvance(ESA)andtheVariableAdvanceSparkTiming(VAS

5、T)systems.Page1©ToyotaMotorSales,U.S.A.,Inc.AllRightsReserved.EFI#4-TCCSIGNITIONSYSTEMConventionalEFIIgnitionSystemSparkAdvanceAngleControlIntheConventionalEFIsystem,sparkdetonationcharacteristicsareconsidered.advanceangleisdeterminedbythepositionMec

6、hanicalcontrolofasparkcurveis,atofthedistributor(initialtiming),positionofbest,acompromise.Insomecasesthethemagneticpickupreluctorteethtimingisoptimal;inmostcasesitisnot.(centrifugaladvance),andpositionofthebreakerplateandpickupcoilwindingEngineRPMSi

7、gnal(vacuumadvance).ThesparkadvancecurveisdeterminedbythecalibrationoftheToindicateenginerpmtotheEFIcomputer,centrifugalandvacuumadvancesprings.theConventionalEFIsystemusesthesignalgeneratedatthecoilnegativeterminal(IG-).Besidesbeingsubjecttomechanic

8、alwearBecausethissystemdoesnotuseECUandmis-calibration,thistypeofsparkcontrolledtiming,therpmsignaltotheECUadvancecalibrationisverylimitedandhasnoimpactonsparktimingwhatsoever.inflexiblewhenvariationsincoolantTheIGsignalisusedasaninputforfueltemperat