缸内直喷汽油机的HC排放特性分析及未来排放法规对其的挑战性_英文_

ArticleID:100420579(2001)0320278207HCEmissionAnalysisofGasolineDirectInjectionEnginesandChallengeFacedbySuchEnginesinMeetingFuturesEmissionStandardHUANGYing,GEYun2shan,ZHANGFu2jun,ZHAOJing2wei(SchoolofVehicleandTransportationEngineering,BeijingInstituteofTechnology,Beijing100081,China)Abstract:Basedontheintroductionofthebasiccombustionconceptofgasolinedirectinjection(GDI)engineanditsoperationunderdifferentoperatingconditions,HCemissionmechanismsoftheGDIengineareanalyzed.AndHCemissioncharacteristicsoftheGDIenginearecom2paredwiththePFIengineviaacomparisontestbasedontheFTP275drivingcycle.ItcanbeconcludedthattheGDIengineisfacingabigchallengeinmeetingthefuturesHCemissionstandard.ReasonsforthehigherHCemissionsoftheGDIenginearediscussedandthewaysforHCemissioncontrolaregiven.Keywords:gasolinedirectinjection(GDI);emission;coldstart;gasolineengineCLCnumber:TK411153Documentcode:AReceived2000206212BiographyHUANGYing(1967-),associateprofessor.Withgasolinedirectinjection(GDI)engine,bothfueleconomyanddriveabilitycanbeachievedsimultaneously.SomeworldleadingcompanieshaveputtheirGDIenginesintothemar2ket,suchasMitsubishiandToyota.Howeverthepropertyoftheexhaustemissionisnotclearforthisengine.Itiswellknownthatthevehicleemissionstandardisbecomingmoreandmorestringentworldwide.AccordingtoULEV,Tier2,EuroandEuro,thefurtherreductionofHCemissionsmustbeachieved.AndreferingtoFPT275testcycleandNEDC(newEuropeandrivingcycle)testcycle,tailpipeemissionswillbemeasuredfromstartingup,withaccelerationloadingat21sand11srespectively.Itmeansthatexhaustemissionsduringcoldstarthavebeentakenintoaccount[1].InthispapermechanismsofHCemissionsoftheGDIengineareanalyzed.AndtheHCemissioncharacteristicsoftheGDIengineandthePFIenginearecomparedbasedonsomeexperi2mentalresults.SothebigchallengewhichtheGDIengineisfacinginmeetingthefutureemissionstandardcanbefiguredout.872JournalofBeijingInstituteofTechnology,2001,Vol.10,No.3©1994-2007ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[2,3].Fig.2showsthestratifiedchargeformationconceptoftheMitsubishiGDIengine.Toachievethestratifiedcharge,thefuelisinjectedduringthecompressionstroke.Thefuelsprayisdirectedtowardthepistonsurfaceandafterimpingingonthesphericalpistoncavity,itisreflectedtowardthesparkplug.Uprightstraightintakeportsgenerateanintensivereversetumble,that972HUANGYingetal./HCEmissionAnalysisofGasolineDirectInjectionEnginesandChallengeFaced'1994-2007ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.