汽车发动机的最新技术简介

汽车发动机的最新技术简介汽车发动机的最新技术简介IntroductiontoAdvancedIntroductiontoAdvancedAutomotiveEngineTechnologyAutomotiveEngineTechnologyPDF文件使用FinePrintpdfFactoryPro试用版本创建缀鍴荀荀荀的接车°直溗秊车°寵的缸赏缣的缸°内内容容1.汽油机的冷起动机理和对策2.发动机摩擦的机理、模型和减小办法3.增压、改变压缩比等进气控制技术概要4.稀混合气燃烧气道喷射汽油机5.发动机动力系统的电控技术现状和未来6.电磁式进排气阀(EMV)7.汽油缸内直接喷射(GDI)8.均匀混合压燃式发动机(HCCI)9.混合动力汽车(HEV)10.燃料电池(FC)汽车PDF文件使用FinePrintpdfFactoryPro试用版本创建．汽油直接喷射．汽油直接喷射(GDI)(GDI)PDF文件使用FinePrintpdfFactoryPro试用版本创建:–upto18%FEbenefitwithstratifiedcharge,–upto15%withleanburn,earlyinjection,–upto9%withstoichiometricearlyinjection.PotentialBenefitsofPotentialBenefitsofGasolineDirectGasolineDirectInjectionEnginesInjectionEnginesPDF文件使用FinePrintpdfFactoryPro试用版本创建(unthrottled)Homogeneous(throttled)Early(intstroke)InjectionUnburnedGaswellmixedattimeofsparkburnedgasPDF文件使用FinePrintpdfFactoryPro试用版本创建[bar]Enginespeed[RPM]PIDIDIcompressionratio1.5unitshigherthanPI10%PDF文件使用FinePrintpdfFactoryPro试用版本创建[bar]CyclenumberPortinjection-100204060-0.50.00.51.01.52.02.53.0IMEP[bar]CyclenumberIn-cylinderinjectionPDF文件使用FinePrintpdfFactoryPro试用版本创建•Lightload,lateinjection,stratified:runlean(λ~2)withsubstantialEGRtoreducenear-stoichiometricburnedgastemperatures;leanNOxstoragecatalyst.•Midload,earlyinjection,homogeneous:runlean(λ≤2)withsome(less)EGRtoreducelean-homogeneousburnedgastemperatures;leanNOxstoragecatalyst.•Higherload,earlyinjection,homogeneous:runstoichiometricwiththree-waycatalyst;maybemodestEGR.•Notethatforleanengineoperation,EGRisamixtureof“air”and“stoichiometric”exhaustgases.At(λ=2)EGRishalfair.PDF文件使用FinePrintpdfFactoryPro试用版本创建荀[g/kW-hr]BSFC[g/kW-hr]Stoich,0%EGRHomogeneousDIInc.AFRInc.EGR30:1AFR35:1AFR40:1AFR25:1AFRInc.EGR2.62barBMEP,1500rpm,MBTTyp.prod.eng.EGRsweepPDF文件使用FinePrintpdfFactoryPro试用版本创建[g/kW-hr]BSHC[g/kW-hr]Homog.DI,stoich.25:130:135:140:1Typicalprod.PFIWWMPMitsubishiGDIPDF文件使用FinePrintpdfFactoryPro试用版本创建•GDIenginescanachieveupto18%fuelgainswithunconstrainedemissions,•Fuelinjectionsystemcostsaresignificant,•HCemissionsarestillhighdespiteimprovedfuelinjectionequipment,•NOXcatalysttechnologyisthemajorenabler/inhibitor-cost,•Emissionsandfueleconomypotentialverydependentondrivingcycles,•Particulateemissionsareaconcernandmaylimitfueleconomypotential.PDF文件使用FinePrintpdfFactoryPro试用版本创建预混合压缩点火式预混合压缩点火式发动机发动机(HCCI)(HCCI)PDF文件使用FinePrintpdfFactoryPro试用版本创建:•Dieselplusmoredifficultafter-treatment,•BoostedDIVVT&VCRwithmultipleactuatorsfor:•Variablevalvetiming,•Variablecompressionratio,•Variableboosting.Finesseandlowercost(noorminimalemissioncontrolsystem):•Timedinjectionhomogeneouslowtemperaturecombustion,PDF文件使用FinePrintpdfFactoryPro试用版本创建–narrowAFrange»sparkignition»flamefrontpropagation»highTbHomogeneousCharge,likeaconventionalSIengineCompressionIgnition,likeadieselengineHomogeneouscombustion,asanewcombustionsystemTDC-5cad-30cad-25cad-20cad-10cadcombustionwithoutflamefrontuHCCIcombustion–highTu»autoignition–highdilution»slowburning»lowTbflamefrontHomogeneousChargeCompressionIgnitionHomogeneousChargeCompressionIgnitionPDF文件使用FinePrintpdfFactoryPro试用版本创建舀—ComparisonwithOtherEngines9~21Low(1900K)AF30orhighdilutionNone-diffusion(homogeneous,noflamefront)InwholechamberCompressionheatingHomogeneousGasolineordieselfuelsHCCIGasoline(highoctane#)Gasoline(highoctane#)Dieselfuel(highcetane#)FuelAtsparkpluggapAtsparkpluggapMultiplealongthesprayIgnitionlocation8~10High(2300K)10AF20Thermaldiffusion(propagatingflamefront)SparkHomogeneousSI(PFI)9~1115~20CRHeterogeneous(stratified)Heterogeneous(spray)MixtureHigh(2300K)High(2300K)BurnedgasT30AF40AF18AFRangeThermaldiffusion(propagatingflamefront)Massdiffusion(heterogeneous)CombustionprocessSparkCo