《汽车专业英语》Chapter 4 Engine(2.7)

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1、Chapter4DieselEngineQQuu.1.1LLiisstttthheeddiiffffeerreenncescesbbeettwweeeennDDiieseseellaandndGGaassoolilinneeeengngiinne.e.GasolineEngineDieselEngineExteriormixtureformationInteriormixtureformationExternallysuppliedignitionAuto-ignitioncombustiontemperatureapprox.25

2、00°CHighestcombustiontemperatureapprox.2000°CRegularmixtureinthecombustionchamberIrregularmixtureinthecombustionchamberEnginespeed4000to10000r/minEnginespeed1500to5000r/minlfrom0.7to1.3lalwaysgreaterthan1Compressionratio8～11Compressionratio14～24Maximumcombustionpressur

3、e3~5MPaMaximumcombustionpressure6~8MPaActualefficiencyηeffupto30%Actualefficiencyηeffupto45%AutomotiveEngineeringEnglish1Chapter4DieselEngine1)DieselenginegetsthisnamefromthepioneerworkdonebyDrRudolfDiesel.Thedieselisusedforthemajorityofheavyvehiclesandtheexcellentfuel

4、economymakesitanattractivealternativetothepetrolengineforlightcommercialvehicles,deliveryvansandtaxis.柴油发动机的名称来源于RudolfDiesel博士所完成的开拓性工作。大多数重型车辆使用柴油，优良的燃油经济性使得柴油机成为具有吸引力的替代品,来代替轻型商用车、厢式运输货车和出租车上汽油机。AutomotiveEngineeringEnglish2Chapter4DieselEngine2)Dieselfuelmixturefor

5、mationAsdieselenginesalwaysdealwithinteriormixtureformationonlyaheterogeneousmixtureisobtainedinthecombustionchamber.Inheterogeneousmixturestheexcess-airfactorλextendsfrompureairinthesprayperiphery(l=infinite)topurefuelinthespraycore(l=0).由于柴油机总是只在气缸内部形成可燃混合气，在燃烧室内就会得到

6、不均匀的混合气。不均匀混合气的过量空气系数范围从喷射外围纯空气的无穷大到喷射中心纯燃料的零。AutomotiveEngineeringEnglish3Chapter4DieselEngineDDiieesseellEEnnggiinneeFFuueellssyyssttememinjector喷油器fuelfilter燃油滤清器governor调速器fueltank燃油箱fuel-injectorpump喷油泵feedpump输油泵AutomotiveEngineeringEnglish4Chapter4DieselEngineQQ

7、uu..2:2:LLiisstttthheetthhrreeeepprrececiiseseccoouuppllesesooffiinn--lilinneeppuummppddiieseeselleennggiinne.e.Plungerandbarrelcouple（柱塞和柱塞套）(plungerandplungerbarrel)Deliveryvalvecouple（出油阀偶件）(deliveryvalveanddeliveryvalveseat)Needlevalvecouple（针阀偶件）(needlevalveandnee

8、dlevalvebody)AutomotiveEngineeringEnglish5Chapter4DieselEngine3)in-linepumpfuel-injectionsystem:Thefuel-injectionsyst