The Audi A1 Drive Train – Turbocharged Engines and Dual-clutch Gearbox

《The Audi A1 Drive Train – Turbocharged Engines and Dual-clutch Gearbox》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、AudiA1DrivETrAinTheAudiA1driveTrAinTurbochargedenginesanddual-cluTchgearboxTheturbochargedenginesemphasisetheAudiA1’ssportymarketpositioning.Thespark-ignitionengineswithgasolinedirectinjectionandthecommon-raildieselsallhaveamplepullingpoweranddynamism,alliedtolowfuelconsumptionandcompliancewiththe

2、EU5exhaustemissionlimits.Theseven-speeddual-clutchgearboxisavailableforA1versionswithgasolineordieselengine.AUTHorThe1.2-liTre,63kWTFSiengineTheTFSIenginewithadisplacementof1.2litresistheentry-leveldirect-injection,turbochargedunit.ItcontinuestheTFSIsuccessstoryinasmallerengine-sizecategory.Thisfr

3、iction-optimisedengine,❶,withanimprovedcombustionprocess,helpstoreducethecar’sfuelconsumption.TheprincipaldevelopmentgoalsweredAnielherrmAnnreducingmechanicallossesandoptimisingtheweightoftheisProjectManagerinPowerUnitcompleteengine.DevelopmentatAUDiAGinAmajorfactorinweightreductionisthealuminiume

4、ngineingolstadt(Germany).block,whichhasgreycastironcylinderliners.Byreducingthediameterofthebig-endandmainbearingsto42mm,furtheroptimisationoftheweightofthesteelcrankshaftbecamepos-sible.Overallefficiencyimprovementswereobtainedbyapis-tonringsetwithreducedtangentialtensionandbyloweringthevolumetri

5、cflowofengineoil,usingagallerypressurecon-trolledoilpump.Twovalvespercylinderandreducedmainandbig-endbearingdimensionshavecutfrictionandtheamountofoilneededforlubrication.Flowrestrictionshavebeenelimin-atedfromthedualcoolantcircuits,ensuringthattheidealoper-atingtemperatureisreachedquickly.Theelec

6、tricallycontrolledwastegatefortheintegralturbocharger,whichhasalsobeenoptimised,respondsmorerapidlyandwithgreaterprecision.Inconjunctionwithacoolant-filledchargeairintercoolermounteddirectlyintheintakemanifold,theturbochargerhelpstheenginetodevelopitsfulltorqueof160Nmfromanenginespeedof1500rpmupwa

7、rds,❷.Thistorqueistransmittedtothewheelsonentry-levelversionsoftheA1byafive-speedmanualgearbox.TheenginecomplieswiththeEU5exhaustemissionlimitsandisequippedasstandardwithastart-stopsystem;itisthereforewellequippe