DCT-雙離合器變速器-DSG

1Dual-clutchTransmissions

2Whatisdual-clutchtransmissionsAdual-clutchgearbox,bycontrast,usestwoclutches,buthasnoclutchpedal.InaDCT,however,theclutchesoperateindependently.Oneclutchcontrolstheodd

gears(first,third,fifthandreverse),whiletheothercontrolstheevengears(second,fourthandsixth).

3Whatisdual-clutchtransmissions4ProsandConsofDual-clutch

TransmissionsPros:Withupshiftstakingamere8

milliseconds,manyfeelthattheDCToffersthemostdynamicaccelerationofanyvehicleonthemarket.Bestofall,itaffordsdriverstheluxuryofchoosingwhethertheypreferto

controltheshiftingorletthecomputerdoallofthework.ThemostcompellingadvantageofaDCTisimprovedfueleconomy.Becausepowerflowfromtheenginetothetransmissionisnotinterrupted,fuelefficiencyincreasesdramatically.Someexpertssaythatasix-speedDCTcandeliveruptoa10percentincreaseinrelativefuelefficiencywhencomparedtoaconventionalfive-speedautomatic.InEurope,wheremanualtransmissionsarepreferredbecauseoftheirperformanceandfuelefficiency,somepredictthatDCTswillcapture25percentofthemarketby2012.5ProsandConsofDual-clutch

Transmissions

Cons:Someautomakersarewaryoftheadditional

costsassociatedwithmodifyingproductionlinestoaccommodateanewtypeoftransmission.

ThiscouldinitiallydriveupthecostsofcarsoutfittedwithDCTs,whichmightdiscourage

consumers.Inaddition,manufacturersarealreadyinvestingheavilyinalternatetransmissiontechnologies.Oneofthemostnotableisthecontinuouslyvariabletransmission,orCVT.6ProsandConsofDual-clutch

TransmissionsModernTransmissionsTraditionalTransmissionsDCTCVTAMTATMTComfort++++-++--Acceleration+++++0++Economy++0++0++Cost0--0++7Howdual-clutchtransmissionsworks?8ExampleapplicationsVolkswagenDSG

(Direct

Shift

Gearbox)Porsche

PDK

(PorscheDoppelKupplung)

BMW

DKGFord、Volvo

PowershiftSST（Sport

Shift