奥迪全系自学手册（SSP）：ssp283_6-speed automatic gearbox 09Ein the Audi A8 '03 - Part 1_GB2.pdf

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1、Notes51GearboxAssembliesOverlappinggearshiftoperations/controlAllgearshiftoperations(from1stto6thgearThegearshiftoperationisassistedbyabriefandfrom6thto1stgear)areso-calledreductioninenginetorqueonchanginguporoverlappinggearshiftoperations.Inotheranincreaseinenginetorqueoncha

2、ngingwords:Duringgearshift,theclutchinthedown(witheffectfromnewcontrolunitprocessoftransmittingpowerretainsitsgeneration,refertoPart2SSP284,Page15).transmissioncapacitywithreducedpressureuntilthecorrespondingclutchcuttinginassumesthetorquebeingapplied.Enginetorqueintervention

3、EnginetorqueTorqueCutting-inCutting-outclutchclutchTimeTorqueassumptionoverlap283_03252Byusingoverlappinggearshiftoperations,itEvaluationofthespeedprofileduringtheispossibletoeffectivelyreplacefree-gearshiftoperationpermitscontinuouswheelingbyelectrohydraulicclutchcontrol,ada

4、ptionoftheoverlapcontrol.Chargingandleadingtogreatsavingsintermsofweightthepressurebuild-upprocessintheclutchandspace.areinfluencedbyappropriatelyadaptingthecontrolcurrentofthepressureregulatingThegearshiftoperationsaremonitoredbyvalves.evaluatingthegearboxinputspeedprofile(G

5、182),enablingappropriateactiontobeForfurtherinformation,refertoPart2takenasnecessary(e.g.shiftpressureSSP284,Page7onwards.increase,gearretentionorimplementationofemergencyoperation).RapidchargingOverlapCutting-inclutchpressurePressureCutting-outclutchpressureTime283_05553Gear

6、boxAssembliesPlanetarygearboxAnewfeatureistheuseoftheso-calledLepelletierplanetarygeartrain.Thispermitstheimplementationofsixforwardgearsandonereversegearemployingonlyfiveselectorelements(threeclutchesandtwobrakes).Principle:AsingleplanetarygeartrainisfittedOutputisalwaysviat

7、heringgearoftheupstreamoftheRavigneauxdoubleplanetaryRavigneauxgeartrain.geartrainandprovides2-speeddrivefortheAfurtherfeatureismultipleutilisationofRavigneauxgeartrain.brakesandclutches.Primaryplanetarygeartrain,Secondaryplanetarygeartrain,singleplanetarygeartrainRavigneauxg

8、eartrainRinggearRinggearPlanetgearsPlanetgearPlanetcarrier283_036Pla