direct-shift gearbox - wikipedia, the free encyclopedia

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PartcutawayviewoftheVolkswagenGroup6speedDirectShiftGearbox.Theconcentricmultiplateclutcheshavebeensectioned,alongwiththemechatronicsmodule.Thisalsoshowstheadditionalpowertakeofffordistributingtorquetotherearaxleforfourwheeldriveapplications.Viewthisimagewithannotations

Schematicdiagramofadualclutchtransmission

DirectshiftgearboxFromWikipedia,thefreeencyclopedia

Adirectshiftgearbox(German:DirektSchaltGetriebe[1]),commonlyabbreviatedtoDSG,[2][3]isanelectronicallycontrolleddualclutch[2]multipleshaftmanualgearbox,inatransaxledesignwithoutaconventionalclutchpedal,[4]andwithfullautomatic,[2]orsemimanualcontrol.ThefirstactualdualclutchtransmissionsderivedfromPorscheinhousedevelopmentfor962racingcarsinthe1980s.

Insimpleterms,aDSGistwoseparatemanualgearboxes(andclutches),containedwithinonehousing,andworkingasoneunit.[2][3][5]ItwasdesignedbyBorgWarner,[4]andislicensedtotheVolkswagenGroup,withsupportbyIAVGmbH.Byusingtwoindependentclutches,[2][5]aDSGcanachievefastershifttimes,[2][5]andeliminatesthetorqueconverterofaconventionalepicyclicautomatictransmission.[2]

Contents

1Overview1.1TransverseDSG1.2AudilongitudinalDSG

2ListofDSGvariants3Operationalintroduction

3.1DSGcontrols3.1.1"P"3.1.2"N"3.1.3"D"mode3.1.4"S"mode3.1.5"R"3.1.6Manualmode

3.1.6.1Paddleshifters4Advantagesanddisadvantages5Applications

5.1Audi5.2Bugatti5.3SEAT5.4koda5.5VolkswagenPassengerCars5.6VolkswagenCommercialVehicles

6ProblemsandrecallsofDSGequippedvehicles6.1UnitedStatesofAmerica6.2Australia6.3China

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Dualclutchgearbox:M:MotorA:PrimarydriveB:DoubleClutchC:shaftD:mainshaft,evengearsE:mainshaft,oddgearsF:Output

6.3China6.4Sweden6.5Japan6.6Malaysia6.7Worldwiderecall

7Seealso8References9Externallinks

9.1Officiallinks9.2Independentlinks

Overview

TransverseDSG

Atthetimeoflaunchin2003[2][6]itbecametheworld'sfirstdualclutchtransmissioninaseriesproductioncar,[2][6]intheGermanmarketVolkswagenGolfMk4R32[2][6]andshortlyafterwards,worldwideintheoriginalAudiTT3.2[7]andforthefirstfewyearsofproduction,thisoriginalDSGtransmissionwasonlyavailableintransverselyoriented[2]frontengine,frontwheeldriveorHaldexTractionbasedfourwheeldrivevehiclelayouts.

ThefirstDSGtransaxlethatwentintoproductionfortheVolkswagenGroupmainstreammarqueshadsixforwardspeeds(andonereverse),[6][7]andusedwet/submergedmultiplateclutchpacks[2][4](VolkswagenGroupinternalcode:DQ250,partscodeprefix:02E).[7][8]Ithasbeenpairedtoengineswithupto350Nm(260lbft)oftorque,[6][7]andthetwowheeldriveversionweighs93kg(205lb).ItismanufacturedatVolkswagenGroup'sKasselplant,[2]withadailyproductionoutputof1,500units.[6]

Atthestartof2008,anotherworldfirst,[6]anadditional70kg(150lb)sevenspeedDSGtransaxle[6]

(VolkswagenGroupinternalcode:DQ200,partscodeprefix:0AM)[8][9][10]becameavailable.ItdiffersfromthesixspeedDSG,inthatitusestwosingleplatedryclutches(ofsimilardiameter).[10]ThisclutchpackwasdesignedbyLuKClutchSystems,LLC.[11]ThissevenspeedDSGisusedinsmallerfrontwheeldrivecarswithsmallerdisplacementengineswithlowertorqueoutputs,[6][7][10]suchasthelatestVolkswagenGolf,[6][10]VolkswagenPoloMk5,[10]andthenewSEATIbiza.[7]Ithasbeenpairedtoengineswithupto250Nm(180lbft).[12]IthasconsiderablylessoilcapacitythanthesixspeedDQ250thisnewDQ200usesjust1.7litres(0.37impgal0.45USgal)oftransmissionfluid.[6]

InSeptember2010,VWlaunchedanewsevenspeedDSGbuilttosupportupto650Nm(480lbft),theDQ500.ItsfirstusewasintheAudiTTRS.[13]

AudilongitudinalDSG

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Inlate2008,anallnewsevenspeedlongitudinal[7][14]Stronic[14]versionoftheDSGtransaxlewentintoseriesproduction(VolkswagenGroupinternalcode:DL501,partscodeprefix:0B5).[8]Initially,fromearly2009,itisonlyusedincertainAudicars,andonlywithlongitudinallymountedengines.LiketheoriginalsixspeedDSG,itfeaturesaconcentricdualwetmultiplateclutch.[14]However,thisparticularvariantusesnotablymoreplatesthelargerouterclutch(fortheoddnumberedgears)uses10plates,whereasthesmallerinnerclutch(drivingevennumberedgearsandreverse)uses12plates.[14]AnothernotablechangeovertheoriginaltransverseDSGsisthelubricationsystem[15][16]Audinowutilisetwototallyseparateoilcircuits.[14]Oneoilcircuit,consistingof7.5litres(1.65impgal1.98USgal),lubricatesthehydraulicclutchesandmechatronicswithfullysyntheticspecialistautomatictransmissionfluid(ATF),[14]whilsttheotheroilcircuitlubricatesthegeartrainsandfrontandcentredifferentialswith4.3litres(0.95impgal1.14USgal)ofconventionalhypoidgearoil.[14]Thisdualcircuitlubricationisaimedatincreasingoverallreliability,duetoeliminatingcrosscontaminationofdebrisandwearparticles.[14]Ithasatorquehandlinglimitofupto600Nm(440lbft),[7]andenginepoweroutputsofupto330kW(450PS440bhp).[7]Ithasatotalmass,includingalllubricantsandthedualmassflywheelof141.5kg(312lb).[7]

Thiswasinitiallyavailableintheirquattroallwheeldrivevariants,[8]andisverysimilartothenewZFFriedrichshafensupplied[17]PorscheDoppelKupplung(PDK).[18][19]

ListofDSGvariants

name speeds max.torque(Nm) typeDQ200 7 250 dryDQ250 6 350 wet

DQ380[20] 7 380 wet

DQ500 7 550 wetDQ511 10 550 wetDL501 7 550 wet

Operationalintroduction

Theinternalcombustionenginedrivestwoclutchpacks.[2][4][5]Theouterclutchpackdrivesgears1,3,5[2][4](and7whenfitted),andreverse[2]theouterclutchpackhasalargerdiametercomparedtotheinnerclutch,andcanthereforehandlegreatertorqueloadings.Theinnerclutchpackdrivesgears2,4,and6.[2][4]Insteadofastandardlargedrysingleplateclutch,eachclutchpackforthesixspeedDSGisacollectionoffoursmallwetinterleavedclutchplates(similartoamotorcyclewetmultiplateclutch).Duetospaceconstraints,thetwoclutchassembliesareconcentric,andtheshaftswithinthegearboxarehollowandalsoconcentric.[5]Becausethealternateclutchpack'sgearsetscanbepreselected[2][4][5](predictiveshiftsenabledviathe'unused'sectionofthegearbox),unpoweredtimewhileshiftingisavoided[2][5]becausethetransmissionoftorqueissimplyswitchedfromoneclutchpacktotheother.[2]ThismeansthattheDSG

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takesonlyabout8millisecondstoupshift.[3][4]Incomparison,thesequentialmanualtransmission(SMT)intheFerrariF430Scuderiatakes60millisecondstoshift,[21]or150millisecondsintheFerrariEnzo.[3]Thequotedtimeforupshiftsisthetimethewheelsarecompletelynonpowered.

DSGcontrols

Thedirectshiftgearboxusesafloormountedtransmissionshiftlever,verysimilartothatofaconventionalautomatictransmission.[10]Theleverisoperatedinastraight'foreandaft'plane(withoutany'dogleg'offsetmovements),andusesanadditionalbuttontohelppreventaninadvertentselectionofaninappropriateshiftleverposition.

"P"

Ppositionofthefloormountedgearshiftlevermeansthatthetransmissionissetin"Park".Bothclutchpacksarefullydisengaged,allgearsetsaredisengaged,andasolidmechanicaltransmission'lock'isappliedtothecrownwheeloftheDSG'sinternaldifferential.Thispositionmustonlybeusedwhenthemotorvehicleisstationary.Furthermore,thisisthepositionwhichmustbesetontheshiftleverbeforethevehicleignitionkeycanberemoved.

"N"

Npositionofthefloormountedshiftlevermeansthatthetransmissionisin"neutral".SimilartoPabove,bothclutchpacksandallgearsetsarefullydisengagedhowever,theparkinglockisalsodisengaged.

"D"mode

Whilstthemotorvehicleisstationaryandinneutral(N),thedrivercanselectDfor"drive"(afterfirstpressingthefootbrakepedal).Thetransmission'sreversegearisselectedonthefirstshaftK1,[3]andtheouterclutchK2engagesatthestartofthe'bitepoint'.Atthesametime,onthealternategearshaft,thereversegearclutchK1isalsoselected[2][3](preselected),asthegearboxdoesn'tknowwhetherthedriverwantstogoforwardorreverse.Theclutchpackforsecondgear(K2)getsreadytoengage.Whenthedriverreleasesthebrakepedal,theK2clutchpackincreasestheclampingforce,allowingthesecondgeartotakeupthedrivethroughanincreaseofthe'bitepoint',andtherebytransferringthetorquefromtheenginethroughthetransmissiontothedriveshaftsandroadwheels,causingthevehicletomoveforward.Depressingtheacceleratorpedalengagestheclutchandcausesanincreaseofforwardvehiclespeed.Pressingthethrottlepedaltothefloor(hardacceleration)willcausethegearboxto"kickdown"tofirstgeartoprovidetheaccelerationassociatedwithfirst,althoughtherewillbeaslighthesitationwhilethegearboxdeselectssecondgearandselectsfirstgear.Asthevehicleaccelerates,thetransmission'scomputerdetermineswhenthesecondgear(whichisconnectedtothesecondclutch)shouldbefullyused.Dependingonthevehiclespeedandamountofenginepowerbeingrequestedbythedriver(determinedbythepositionofthethrottlepedal),[4]theDSGthenupshifts.Duringthissequence,theDSGdisengagesthefirstouterclutchwhilstsimultaneouslyengagingthesecondinnerclutch[2][3][4](allpowerfromtheengineisnowgoingthroughthesecondshaft),thuscompletingtheshiftsequence.Thissequencehappensin8milliseconds(aidedbypreselection),[3][4]andcanhappenevenwithfullthrottleopening,andasaresult,thereisvirtuallynopowerloss.[2][4]

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Oncethevehiclehascompletedtheshifttosecondgear,thefirstgearisimmediatelydeselected,andthirdgear(beingonthesameshaftas1stand5th)ispreselected,[2][3][4]andispending.Oncethetimecomestoshiftinto3rd,thesecondclutchdisengagesandthefirstclutchreengages.[2]Thismethodofoperationcontinuesinthesamemannerfortheremainingforwardgears.

Downshiftingissimilartoupshiftingbutinreverseorder,andisslower,at600milliseconds,duetotheengine'sElectronicControlUnit,orECU,needingto'blip'thethrottlesothattheenginecrankshaftspeedcanmatchtheappropriategearshaftspeed.[2][4]Thecar'scomputersensesthecarslowingdown,ormorepowerrequired(duringacceleration),andthusengagesalowergearontheshaftnotinuse,andthencompletesthedownshift.

TheactualshiftpointsaredeterminedbytheDSG'stransmissionECU,whichcommandsahydromechanicalunit.[2]ThetransmissionECU,combinedwiththehydromechanicalunit,arecollectivelycalleda"mechatronics"[2]unitormodule.BecausetheDSG'sECUuses"fuzzylogic",theoperationoftheDSGissaidtobe"adaptive"thatis,theDSGwill"learn"howtheuserdrivesthecar,andwillprogressivelytailortheshiftpointsaccordinglytosuitthehabitsofthedriver.

Inthevehicleinstrumentdisplay,betweenthespeedometerandtachometer,theavailableshiftleverpositionsareshown,thecurrentpositionoftheshiftleverishighlighted(emboldened),andthecurrentgearratioinuseisalsodisplayedasanumber.

Under"normal",progressiveandlinearaccelerationanddeceleration,theDSGshiftsina"sequential"manner,i.e.underacceleration:1st>2nd>3rd>4th>5th>6thandthesamesequencereversedfordeceleration.However,theDSGcanalsoskipthenormalsequentialmethod,by'missingout'adjacentgears,andshifttwoormoregears.[3]Thisismostapparentifthecarisbeingdrivenatsedatespeedsinoneofthehighergearswithalightthrottleopening,andtheacceleratorpedalisthenpresseddown,engagingthe"kickdown"function.Duringkickdown,theDSGwillskipgears,[10]shiftingdirectlytothemostappropriategeardependingonspeedandthrottleopening.Thiskickdownmaybeengagedbyanyincreasedacceleratorpedalopening,andiscompletelyindependentoftheadditionalresistancetobefoundwhenthepedalispressedfullytothefloor,whichwillactivateasimilarkickdownfunctionwheninManualoperationmode.Thesevenspeedunitinthe2007Audivariantswillnotautomaticallyshiftto6thgearrather,itstaysat5thtokeeppoweravailableatahighRPMwhilecruising.

WhenthefloormountedgearselectorleverisinpositionD,theDSGworksinfullyautomaticmode,[3][5]

withemphasisplacedongearshiftsprogrammedtodelivermaximumfueleconomy.[3][10]Thatmeansthatshiftswillchangeupanddownveryearlyintherevrange.Asanexample,ontheVolkswagenGolfMk5GTI,sixthgearwillbeengagedaround52km/h(32mph),wheninitiallyusingtheDSGtransmissionwiththe'default'ECUadaptationalthoughwithan"aggressive"or"sporty"drivingstyle,theadaptiveshiftpatternwillincreasethevehiclespeedatwhichsixthgearengages.

"S"mode

ThefloorselectorleveralsohasanSposition.[2]WhenSisselected,"sport"mode[2]isactivatedintheDSG.Sportmodestillfunctionsasafullyautomaticmode,[3]identicalinoperationto"D"mode,butupshiftsanddownshiftsaremademuchhigheruptheenginerevrange.[2][3][10]Thisaidsamoresportydrivingmanner,[2]byutilisingconsiderablymoreoftheavailableenginepower,andalsomaximising

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enginebraking.However,thismodedoeshaveadetrimentaleffectonthevehiclefuelconsumption,whencomparedtoDmode.Thismodemaynotbeidealtousewhenwantingtodriveina'sedate'mannernorwhenroadconditionsareveryslippery,duetoice,snowortorrentialrainbecauselossoftiretractionmaybeexperienced(wheelspinduringacceleration,andmayalsoresultinroadwheellockingduringdownshiftsathighenginerpmsunderclosedthrottle).On4motionorquattroequippedvehiclesthismaybepartiallyoffsetbythedrivetrainmaintainingfulltimeengagementofthereardifferentialin'S'mode,sopowerdistributionunderlossoffrontwheeltractionmaybemarginallyimproved.

Sishighlightedintheinstrumentdisplay,andlikeDmode,thecurrentlyusedgearratioisalsodisplayedasanumber.

"R"

Rpositionofthefloormountedshiftlevermeansthatthetransmissionisin"reverse".ThisfunctionsinasimilarwaytoD,butthereisjustone'reversegear'.Whenselected,Rishighlightedintheinstrumentdisplay.

Manualmode

Additionally,thefloorshiftleveralsohasanotherplaneofoperation,formanual[3][5]mode,withspringloaded"+"and""positions.Thisplaneisselectedbymovingthestickawayfromthedriver(invehicleswiththedriver'sseatontheright,theleverispushedtotheleft,andinlefthanddrivecars,thestickispushedtotheright)whenin"D"modeonly.Whenthisplaneisselected,theDSGcannowbecontrolledlikeamanualgearbox,albeitonlyunderasequentialshiftpattern.

Inmost(VW)applications,thereadoutintheinstrumentdisplaychangesto654321,andjustliketheautomaticmodes,thecurrentlyusedgearratioishighlightedoremboldened.Inotherversions(e.g.ontheAudiTT)thedisplayshowsjustMfollowedbythegearcurrentlyselected,e.g.M1,M2etc.

Tochangeupagear,theleverispushedforward(againstaspringpressure)towardsthe"+",andtochangedown,theleverispulledrearwardtowardsthe"".TheDSGtransmissioncannowbeoperatedwiththegearchangesbeing(primarily)determinedbythedriver.Thismethodofoperationiscommonlycalled"tiptronic".[2]Intheinterestsofenginepreservation,whenacceleratinginManual/tiptronicmode,theDSGwillstillautomaticallychangeupjustbeforetheredline,andwhendecelerating,itwillchangedownautomaticallyatverylowrevs,justbeforetheengineidlespeed(tickover).Furthermore,ifthedrivercallsforagearwhenitisnotappropriate(e.g.:requestingadownshiftwhenenginespeedisneartheredline)theDSGwillnotchangetothedriver'srequestedgear.[3]

CurrentvariantsoftheDSGwillstilldownshifttothelowestpossiblegearratiowhenthekickdownbuttonisactivatedduringfullthrottlewhilstinmanualmode.InManualmodethiskickdownisonlyactivatedbyanadditionalbuttonatthebottomoftheacceleratorpedaltravelunlessthisispressedtheDSGwillnotdownshift,andwillsimplyperformafullthrottleaccelerationinwhatevergearwaspreviouslybeingutilised.

Paddleshifters

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Initiallyavailableoncertainhighpoweredcars,andthosewitha"sporty"trimlevelsuchasthoseusingthe2.0TFSIand3.2/3.6VR6engines[2]steeringwheelmountedpaddleshifters[3][5]wereavailable.However,thesearenowbeingoffered(eitherasastandardinclusivefitment,orasafactoryoptionalextra)onvirtuallyallDSGequippedcars,throughoutallmodelranges,includinglesserpoweroutputapplications,suchasthe105PSVolkswagenGolfPlus.[10]

Theseoperateinanidenticalmannerasthefloormountedshiftleverwhenitisplacedacrossthegateinmanualmode.Thepaddleshiftershavetwodistinctadvantages:thedrivercansafelykeepbothhandsonthesteeringwheelwhenusingtheManual/tiptronicmodeandthedrivercantemporarilymanuallyoverrideeitheroftheautomaticprogrammes(DorS),[10]andgaininstantmanualcontroloftheDSGtransmission[10](withintheabovedescribedconstraints).

Ifthepaddleshiftactivatedmanualoverrideofoneoftheautomaticmodes(DorS)isusedintermittentlytheDSGtransmissionwilldefaultbacktothepreviouslyselectedautomaticmodeafterapredetermineddurationofinactivityofthepaddles,orwhenthevehiclebecomesstationary.Alternatively,shouldthedriverwishtoimmediatelyreverttofullyautomaticcontrol,thiscanbedonebyactivatingandholdingthe"+"paddle[10]foratleasttwoseconds.

Advantagesanddisadvantages

Advantages

Betterfueleconomy[2][6](upto15%improvement)thanconventionalplanetarygearedautomatictransmission(duetolowerparasiticlossesfromoilchurning)[5]andforsomemodelswithmanualtransmissions[2]

Nolossoftorquetransmissionfromtheenginetothedrivingwheelsduringgearshifts[2][4][5]Shortupshifttimeof8millisecondswhenshiftingtoagearthealternategearshafthaspreselected[3][4]

Smoothgearshiftoperations[4][5]

Consistentdownshifttimeof600milliseconds,regardlessofthrottleoroperationalmode[4]

Disadvantages

Achievingnoaccelerationorhillclimbing,whileavoidingenginespeedshigherthanacertainlimit(e.g.3000or4000RPM),isdifficultsinceitrequiresavoidingtriggeringthekickdownswitch.Avoidingtriggeringthekickdownswitchrequiresagoodfeelofthethrottlepedal,butuseoffullthrottlecanstillbeachievedwithalittlesensitivityasthekickdownbuttonisonlyactivatedbeyondthenormalfullopeningoftheacceleratorpedal.Marginallyworseoverallmechanicalefficiencycomparedtoaconventionalmanualtransmission,especiallyonwetclutchvariants(duetoelectronicsandhydraulicsystems)[5]Expensivespecialisttransmissionfluids/lubricantswithdedicatedadditivesarerequired,whichneedregularchanges[15][16]Relativelyexpensivetomanufacture,andthereforeincreasesnewvehiclepurchasepriceRelativelylengthyshifttimewhenshiftingtoagearratiowhichthetransmissioncontrolunitdidnotanticipate(around1100ms,dependingonthesituation)[4][22]Torquehandlingcapabilityconstraintsperceivealimitonaftermarketenginetuningmodifications(thoughmanytunersandusershavenowgreatlyexceededtheofficialtorquelimits.)Latervariants

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havebeenfittedtomorepowerfulcars,suchasthe300bhp/350NmVWR36andthe272bhp/350NmAudiTTS.HeavierthanacomparableGetragconventionalmanualtransmission(75kg(165lb)vs.47.5kg(105lb))Fueleconomyupto15%worsethanamanual.

Applications

VolkswagenGroupvehicleswiththeDSGgearboxinclude:[8]

Audi

Afteroriginallyusingthe'DSG'moniker,Audisubsequentlyrenamedtheirdirectshiftgearboxto"Stronic".

AudiTTAudiA1AudiA3AudiS3AudiA4(B8)[7][14]

AudiS4(B8)[7][14]AudiA5AudiA7AudiA8(D4)AudiQ3AudiQ5[7][14]AudiR8facelift

Bugatti

BugattiVeyronEB16.4[6](developedbyRicardo[23]ratherthanBorgWarner)

SEAT

SEATIbizaSEATLenSEATAlteaSEATToledoSEATAlhambra

koda

kodaFabiakodaOctaviakodaRapid(2012)kodaRoomsterkodaSuperbIIkodaYeti

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VolkswagenPassengerCars

VolkswagenPoloVolkswagenGolf,GTI,TDI,R32,R[2][6]VolkswagenJettaGLI,TDIVolkswagenEosVolkswagenTouran[6]VolkswagenNewBeetleVolkswagenNewBeetleConvertibleVolkswagenPassatandR36VolkswagenCCVolkswagenSharanVolkswagenSciroccoVolkswagenTiguan2011VolkswagenLupo99051.2TDI3L

VolkswagenCommercialVehicles

VolkswagenCaddycarderivedvanVolkswagenTransporter(T5)mediumvan[24]

ProblemsandrecallsofDSGequippedvehicles

The7speedDQ200and6speedDQ250gearboxessometimessufferfrompowerloss(geardisengaging)duetoshortcircuitingofwirescausedbyabuildupofsulphurinthetransmissionoil.[25]

UnitedStatesofAmerica

InAugust2009,VolkswagenofAmericaissuedtworecallsofDSGequippedvehicles.Thefirstinvolved13,500vehicles,[26]andwastoaddressunplannedshiftstotheneutralgear,[26]whilethesecondinvolvedsimilarproblems(bythenattributedtofaultytemperaturesensors)andappliedto53,300vehicles.[26][27][28]TheserecallsaroseasaresultofinvestigationscarriedoutbytheUSNationalHighwayTrafficSafetyAdministration(NHTSA),[29]whereownersreportedtotheNHTSAalossofpowerwhilstdriving.[26]Thisinvestigationpreliminaryfoundonly2008and2009modelyearvehiclesasbeingaffected.[26][29]

Australia

InNovember2009,VolkswagenrecalledcertainGolf,Jetta,EOS,Passat&Caddyequippedwith6speedDQ250DSGtransmissionbecausethegearboxmayreadtheclutchtemperatureincorrectlywhichleadtoclutchprotectionmode,causingalossofpowerofthevehicle.[30]

China

Since2009therehavebeenwidespreadconcernsfromChineseconsumersparticularlyamongtheonlinecommunity,whoexpressedthatVolkswagenhasfailedtorespondtocomplaintsaboutdefectsinitsDSGequippedvehicles.Typicalissuesassociatedwith6speedDSGincludeabnormalnoiseandinabilityto

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changegearwhileissuesassociatedwith7speedDSGincludeabnormalnoise,excessiveshiftshock,abnormalincreaseinengineRPM,flashinggearindicatoronthedashboardaswellasinabilitytoshifttoevennumberedgears.[31]InMarch2012ChinasqualitywatchdogtheGeneralAdministrationofQualitySupervision,InspectionandQuarantine(AQSIQ)saidthatithadbeenincontactwithVolkswagen(China)andurgedthecarmakertoprobetheissues.[32][33]InasurveyheldbyGasgoo.com(China)of2,937industryexpertsandinsiders,83%ofrespondentsbelievedthatthecarmakershouldconsiderafullvehiclerecall.[34]InMarch2012VolkswagenGroupChinaadmittedthattherecouldbeanissueinitssevenspeedDSGgearboxesthatmayaffectapproximately500,000vehiclesfromitsvarioussubsidiariesinChina.[35]Asoftwareupgradehassincebeenofferedfortheaffectedvehiclesinanattempttorepairtheproblem.

Accordingto163.comoneofChina'smostpopularwebportalsinMarch2012aboutaquarterofthecomplaintsaboutproblemsfoundincarsinChina'sautomotivemarketweremadeagainstDSGequippedvehiclesmanufacturedbyVolkswagen.[36]Thetopfivemodelsthatdominatethosecomplaintswere:

VolkswagenMagotan6%VolkswagenBora5.3%VolkswagenSagitar5.3%VolkswagenTouareg4.7%VolkswagenGolf4%

OnMarch15,2013,ChinaCentralTelevisionairedaprogramfortheWorldConsumerRightsDay.TheprogramcriticizedtheissueassociatedwithDSGequippedvehiclesmanufacturedbyVolkswagen.OnMarch17,2013VolkswagenGroupChinaannouncedonitsofficialWeibothatitwillvoluntarilyrecallvehiclesequippedwithDSGboxes.[37]SomesourceshaveestimatedthefailurerateofDSGequippedvehiclessoldinChinatobegreaterthan20,000permillionsold.

Sweden

VWSwedenstoppedsellingthePassatEcoFuelDSGasataxiaftermanycarshadproblemswiththe7speedDSGgearbox.TheyinsteadofferedtheTouranEcoFuelDSG,whichisusinganupdatedversionofthesameDSGgearbox.[38]

Japan

TherecallhasbeenextendedtoJapanwith91,000(VWandAudiusingthesameDSG)beingrecalled.[39]

Malaysia

13daysaftertheSingaporerecall,VolkswagenMalaysiaalsoannouncedarecallforthe7speedDSG.Noofficialstatementwasreleasedbythecompany,butitwasstatedthatatotalof3,962wereinvolvedintheunitrecallexerciseunitsproducedbetweenJune2010andJune2011,withaffectedvehiclesbeingGolf,Polo,Scirocco,CrossTouran,PassatandJettamodelsequippedwiththetransmission.[40]

Worldwiderecall

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November14,2013VolkswagenGroupannouncedamajorworldwiderecalloverproblemswiththe7speedDSGgearbox(model:DQ200)whichmightleadtolossofpower,coveringsome1.6mcarsincludingthosecarryingtheAudi,SkodaandSEATbadges.[41]

Seealso

Volkswagen01MtransmissionListofZFtransmissionsListofAisintransmissionsListofGMtransmissionsListofFordtransmissionsMultimodemanualtransmission

References1. VolkswagenServiceTrainingManual30802E6speedDSG2. "VolkswagenDSGWorld'sfirstdualclutchgearboxinaproductioncar"(https://www.volkswagenmedia

services.com/medias_publish/ms/content/en/pressemitteilungen/2002/11/22/volkswagen_dsg__world.standard.gidoeffentlichkeit.html).VolkswagenMediaServices.com(Pressrelease).VolkswagenGroup/VolkswagenAG.22November2002.Retrieved30October2009.

3. "TwinClutch/DirectShiftGearbox(DSG)Whatitis,howitworks"(http://cars.about.com/od/thingsyouneedtoknow/a/ag_howDSGworks.htm).Cars.About.com.Retrieved27October2009.

4. MarkWan.Gearbox"TransmissionTwinClutchGearbox"(http://www.autozine.org/technical_school/gearbox/tech_gear_manual.htm#TwinClutch).AutoZine.org.AutoZineTechnicalSchool.Retrieved27October2009.

5. "HowtheDualClutchTransmissionWorks"(http://www.dctfacts.com/widc_pg3a.asp).DCTfacts.com.TheLubrizolCorporation.2009.Retrieved27October2009.

6. "The7speedDSGtheintelligentautomaticgearboxfromVolkswagen"(http://www.volkswagenag.com/vwag/vwcorp/info_center/en/themes/2008/01/the_7speed_dsg.html).VolkswagenAG.com.VolkswagenGroup/VolkswagenAG.21January2008.Retrieved3November2009.

7. "VolkswagenGroupextendsreachofdualclutchtransmissions"(http://www.dctfacts.com/hmStory6a.asp).DCTfacts.com.TheLubrizolCorporation.8May2009.Retrieved27October2009.

8. ETKA9. VolkswagenServiceTrainingManual3900AM7speedDSG

10. "GolfPlusontheRoad"(http://www.dctfacts.com/otr_pg1.asp).DCTfacts.com.TheLubrizolCorporation.2009.Retrieved28October2009.

11. "LuKDualDryClutch7SpeedDSGGearboxinvolumeproductionatVolkswagen"(http://www.lukclutch.com/content.schaeffler_as.us/us/press/pressreleases/pressdetails.jsp?id=2877676).LuKclutch.com.SchaefflerGroupUSAInc.,BHL,GERMANY.13February2008.Retrieved27October2009.

12. http://en.volkswagen.com/en/innovationandtechnology/technicalglossary/7gangdsggetriebe.html13. http://www.volkswagenag.com/content/vwcorp/info_center/en/themes/2010/01/dsg_the_new_dq500.html14. "InsideAudispremiumDCT"(http://www.dctfacts.com/indusIn_pg3.asp).DCTfacts.com.TheLubrizol

Corporation.8May2009.Retrieved27October2009.15. "SpecialTransmissionsNeedSpecialLubricants"(http://www.dctfacts.com/hmStory2a.asp).DCTfacts.com.The

LubrizolCorporation.2009.Retrieved28October2009.16. "SpecialTransmissionsNeedSpecialLubricants"(http://www.dctfacts.com/information/speciallubricants.aspx).

DCTFacts.com.Retrieved15May2011.17. "ZF7speeddualclutchtransmission"

(http://www.zf.com/corporate/en/products/product_range/cars/cars_7_speed_dual_clutch_transmission.shtml).ZF.com.ZFFriedrichshafenAG.Retrieved28October2009.

18. "Top911movestoindustrystandardshiftcontrols"(http://www.dctfacts.com/lnws_pg12a.asp).DCTfacts.com.

8/7/2015 DirectshiftgearboxWikipedia,thefreeencyclopedia

https://en.wikipedia.org/wiki/Directshift_gearbox 12/13

18. "Top911movestoindustrystandardshiftcontrols"(http://www.dctfacts.com/lnws_pg12a.asp).DCTfacts.com.TheLubrizolCorporation.24September2009.Retrieved27October2009.

19. "PorscheJoinstheDCTSet"(http://www.dctfacts.com/hmStory3.asp).DCTfacts.com.TheLubrizolCorporation.Retrieved28October2009.

20. "DQ380"(http://auto.sina.com.cn/news/20141106/15271355710.shtml).auto.sina.com.cn.Retrieved26November2014.

21. MarkWan(17October2007)."FerrariF430Scuderia"(http://www.autozine.org/html/Ferrari/F430.html#Scuderia).AutoZine.org.Retrieved27October2009.

22. "HowDualClutchTransmissionsWork"(http://www.autoevolution.com/news/howdualclutchtransmissionswork5458.html).AutoEvolution.com.SoftNewsNET.31March2009.Retrieved30October2009.

23. "RicardoExtendsDCTProductionforOpentopBugatti"(http://www.dctfacts.com/hmStory2b.asp).DCTfacts.com.TheLubrizolCorporation.16January2009.Retrieved28October2009.

24. "Volkswagen(CommercialVehicles)mediumvanisfirstwithDCT"(http://www.dctfacts.com/dcmarket_pg4.asp).DCTfacts.com.TheLubrizolCorporation.24September2009.Retrieved27October2009.

25. "Volkswagenindamagelimitationmodeafterrecalls"(http://www.theaustralian.com.au/executiveliving/volkswagenindamagelimitationmodeafterrecalls/storyfngmee2f1226664115767).TheAustralian.15June2013.

26. Jensen,Christopher(21August2009)."VWDSGTransmissionProblemLeadstoRecall"(http://wheels.blogs.nytimes.com/2009/08/21/vwdsgtransmissionproblemleadstorecall/).wheels.blogs.nytimes.com(TheNewYorkTimesCompany).Retrieved30November2009.

27. Chang,RichardS.(28August2009)."VWHasMoreProblemsWithItsDSGTransmission"(http://wheels.blogs.nytimes.com/2009/08/28/vwhasmoreproblemswithitsdsgtransmission/).wheels.blogs.nytimes.com(TheNewYorkTimesCompany).Retrieved30November2009.

28. "VolkswagenwillrepairDSGtransmissionson53,300vehicles"(http://blog.caranddriver.com/volkswagenwillrepairdsgtransmissionson53300vehicles/).Blog.CarAndDriver.com.HachetteFilipacchiMediaU.S.,Inc.,.28August2009.Retrieved27October2009.

29. ODIResumeVolkswagenofAmerica,Inc.,20082009VolkswagenEOS,GTI,JettaandR32withDSGtransmission(http://nhthqnwws112.odi.nhtsa.dot.gov/acms/docservlet/Artemis/Public/Pursuits/2009/PE/INOAPE0903536241.pdf)PDF,NationalHighwayTrafficSafetyAdministration,Retrieved30November2009.Thedirectshiftgearboxcanmalfunctionatanyspeedandcausethevehicletolosemotivepowersuddenlyandwithoutwarning

30. "VolkswagenVolkswagenGolf,Jetta,EOS,Passat&CaddyVehicles"(https://www.recalls.gov.au/content/index.phtml/itemId/1048814).Nov3,2009.

31. .GlobalTimeshttp://finance.huanqiu.com/roll/201203/2527982.html.Retrieved20120405.Missingorempty|title=(help)

32. .ChinaDailyhttp://www.chinadaily.com.cn/bizchina/201203/14/content_14835905.htm.Retrieved20120405.Missingorempty|title=(help)

33. .justautohttp://www.justauto.com/news/vwcriticisedforignoringdsggearboxcustomercomplaints_id121552.aspx.Retrieved20120405.Missingorempty|title=(help)

34. "Analysis:IndustryviewpointsonVW'sChineseDSGgearboxcontroversy"(http://www.chinadaily.com.cn/bizchina/201203/14/content_14835905.htm).Gasgoo.Retrieved20120405.

35. "VWissuessoftwareupgradetoresolvegearboxproblems,shiesawayfromrecall"(http://autonews.gasgoo.com/chinanews/vwissuessoftwareupgradetoresolvegearboxprob120313.shtml).Gasgoo.Retrieved20120405.

36. .163.comhttp://auto.163.com/12/0331/15/7TUFFTKV00084P3B_2.html.Retrieved20120406.Missingorempty|title=(help)

37. .qq.comhttp://auto.qq.com/a/20130316/000003.htm.Retrieved20130317.Missingorempty|title=(help)38. http://www.teknikensvarld.se/2012/12/29/37192/volkswagenpassatslutsomtaxi/VolkswagenPassatslut

somtaxi39. "Volkswagenrecallextended."(http://news.drive.com.au/drive/motornews/volkswagenrecallextended

201305132jhon.html).drive.com.au(FairfaxMedia).13May2013.Retrieved13May2013.40. "VWMalaysiajoinsrecallof7speedDSGcars"(http://ride.asiaone.com/news/general/story/vwmalaysiajoins

recall7speeddsgcars).VolkswagenMalaysia(Asiaone).12May2013.Retrieved12May2013.41. "Volkswagenrecallsnearly3millioncarsworldwideincluding60,000inUKoverfaultygearboxandlightfuses."

8/7/2015 DirectshiftgearboxWikipedia,thefreeencyclopedia

https://en.wikipedia.org/wiki/Directshift_gearbox 13/13

Externallinks

DualClutchTransmissionDCTFacts(http://www.dctfacts.com)

Officiallinks

VolkswagenAGcorporatewebsite(http://www.VolkswagenAG.com/vwag/vwcorp/content/en/homepage.html)

Independentlinks

PicturesanddiagramsofDQ250DSG(http://www.worldcarfans.com/204030112966/vwdsgtransmission)atWorldCarFans.com.Reviews,videos,andexplanationofDSGtransmission(http://www.myturbodiesel.com/1000q/dsg_faq.htm)FirstDrive:AudiTT3.2DSG(http://www.vwvortex.com/artman/publish/article_317.shtml)reviewatVWvortex.com.Europeaninterestindualclutchtechnologyshiftsupagear(http://www.justauto.com/features_detail.asp?art=1171),aninformativearticlefromJustAuto.com.ComputercontrolledMeccanomodelofaDSGTransmission(http://www.selmec.org.uk/article_0004_computer_controlled_dsg_transmission.aspx)byAlanWenbourneoftheSouthEastLondonMeccanoClub(SELMEC).VideoofAlanWenbourne'sMeccanoDSGinoperation(http://www.youtube.com/watch?v=iUdc48RH9OE)atYouTube.com.

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41. "Volkswagenrecallsnearly3millioncarsworldwideincluding60,000inUKoverfaultygearboxandlightfuses."(http://www.dailymail.co.uk/news/article2507401/Volkswagenrecallcarsworldwidefaultygearboxlightfuses.html).Volkswagen(DailyMail).14November2013.Retrieved14November2013.