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1、ThechallengesoffordownsizeGDIenginewithturbo-chargepre-ignitionandsuper-knockIntroductionMechanismInfluencefactorContents2of15ConclusionDownsizeGDITurbo-chargeVVT1Introduction3of15ImprovefueleconomyLightenenginesizeSuper-knockSpeciallywhenengineisoperatingatfullloadandlowspeed()reductionem
2、issions1Introduction3of15MitigatingIntensitiesofSuperKnocksEncounteredinHighlyBoostedGasolineDirectInjectionEngines.SAEPaper2015Super-knockissueshadbeenwidelyreportedbyautomotiveindustriesandengineinstitutesindownsizedgasolineenginesinrecentyears,Itisalsoachallengetobefacedindevelopmentoft
3、hehighly-boostedTGDIengines1Introduction4of15Figure2.P-Vdiagramsforcylinderswithabnormalandnormalcombustion:Figure1.PatternofLSPI:oneisolatedevent.MitigatingIntensitiesofSuperKnocksEncounteredinHighlyBoostedGasolineDirectInjectionEngines.SAEPaper20151Introduction4of15MitigatingIntensitieso
4、fSuperKnocksEncounteredinHighlyBoostedGasolineDirectInjectionEngines.SAEPaper2015Figure3.DurationsofcombustionincycleswithnormalandabnormalcombustioninCylinder3.Figure4.CrankanglesforMFB05,MFB50andMFB90fornormalcombustioncycleswiththoseinabnormalcombustioncycles.2Mechanism5of15Figer5.Thedi
5、fferencebetweensuper-knockandknock2Mechanism6of15WillandJ,DanielM,MontefrancescoE,etal.Limitsondownsizinginsparkignitionenginesduetopre-ignition.MTZworldwide,2009,70(5):56-61.SuperKnockisatypeofpre-ignitionphenomenon.Pre-ignitionmaynotleadtosuper-knock,butsuper-knockmustbetriggeredbypre-ig
6、nition.So,suppressionpre-ignitionisamostreasonableapproachtomitigatesuperknocks.super-knockPre-ignitionFigure6.Therelationshipbetweenpre-ignitionandsuperknock2Mechanism6of15WillandJ,DanielM,MontefrancescoE,etal.Limitsondownsizinginsparkignitionenginesduetopre-ignition.MTZworldwide,2009,70(
7、5):56-61.Inrecentyears,manyresearchershaveinvestigatedthepossiblemechanism.Itisgenerallyacceptedthattherearethreepossibleinducementsforpre-ignition:surfaceignition,lubricatedoil,andfuel/oilmixing.7of15lubricateoilZahdeh,A.,Rothenberger,P.,Nguyen,W.,Anbarasu,M.
