资源描述：
《汽车排放技术---英文翻译》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、Withthedevelopmentofautomobileindustry,carownershipisincreasing.Thecarbringsalotofconvenience,atthesametime,alsocausesharmtopeople'shealthandsocialenvironment.Accordingtoreports,withthesustainedandrapid developmentofnationaleconomyinourcountry,thecityatmosphericpollutionha
2、sbecomeincreasinglyprominent,suchasBeijing,Guangzhou,Shanghai.Largeamountofpollutantsdischargedbyasingle,urban airpollutioninmotorvehiclesfortheprimarypollutionsource.Accordingtotheresearchoftheenvironmentalprotectiondepartmentasaresult,themotorvehicleemissionsofairpolluta
3、nts,thesharerateofCO,HCandNOxinBeijingrespectively 63%,73%and46%,thecentralregionwere86%,96%and56%,respectively.Thelargeandmedium-sizedcitiesinmanycountriestherearemorethanfiftypercentofairpollutioncomesfromexhaustgasesfromthecars.Carshave becomethemainpollutionsource,thep
4、reventionandcontroltechnologyofvehicleemissionpollutionhasbeenbecomingthecurrentimportantissue.1GasolineEmissionControlTechnology1.1Leanburnwhenengineiscold.Whenthemachineiscold,lowcatalystactivity,itisnotconducivetoreducetheemissionofHC,atthistime,reducingtheHCemissionsbe
5、comeamajorissue.Inthemethod,thethincombustiontechnologyisthemosteffective.Inordertoensuretheair-fuelratioofrarefaction,vortexflowcontrolvalvesareinstalledintheairintake,improvingengineairintakesystemandthechargingefficiency;Toimproveenginecombustionsystem,reasonableorganiz
6、ationofthecombustionchambergasflow,promotingtheflamepropagation,improvingthestabilityoffire,theenginestabilityunderleanmixturecombustion,soastoreduceHCemissions.1.2ReduceunexplodedHC.Thefirststepofpistonringbetweenshoreridgeandcylinderwall,theburningflamecannotreach,theare
7、aofunexplodedHCexhaustfromthecylindersdirectly.Toimprovethepositionofthefirstpistonring,thatis,reducingtheheightofthefirstpistonringshore,canreducethevolumebetweenpistonringandcylinderwall,reducethenumberofunexplodedHCemissions.Toreducethewearofpistonringgroove,undernormal
8、circumstances,theimplementationofthealuminacoatingonthesurfaceofapiston,butbecauseinthepi
