dct论文：兼顾降低冲击度和减小滑磨功的dct换挡控制研究

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1、DCT论文：兼顾降低冲击度和减小滑磨功的DCT换挡控制研究【中文摘要】Thedual-clutchtransmission(DCT)isoneofthemostconvenientandefficientpracticaltransmissionsintheworldnowadays.Ithashighmechanicalefficiencysimilartotraditionalmanualtransmission(MT)andrealizedsimilarpowershiftsasautomat

2、ictransmissions(AT)have.BecausetheChineselocalautomotivecompanieshavealongexperienceontheproductionofmanualgearboxes,thedevelopmentofDCTisofgreatpracticalmeaningforChina.Theoldcontradictionbetweenreducingjerksandreducingfrictionalenergylosseshasbeenase

3、riousprobleminthestudyoftraditionalclutchcontrol.Ifwewanttoreducethelevelofjerks,thenmorefrictionalenergylosswillbecaused.Otherwise,ifwereducethefrictionalenergyloss,thenthelevelofgearshiftjerkswillrise.Thisthesisreconsidersthecontradictionverycarefull

4、ybyfindingouttherealdominatingtimezoneofjerksandfrictionoccurring,andappliesnewcontrolstrategiestoachievenewbetterbalancebetweentheoldcontradictions.TheresearchfirstlysetsupanewdynamicmodelofgearshiftsfortheDCTunderanassumptionthat:thetransmissionisamu

5、ltiple-degree-of-freedom(SDOF)rigidbodysystem,withoutanystiffnessordampingcoefficientalongthedriveline.Someothersurroundingfactorsarealsosimplifiedinthemodelwithoutlosingthedynamiccharacteristicsofthesystem.Theinterruptiontothesysteminputsisalsoneglect

6、ed.Forsimulationcomparison,anotherbenchmarkmodelisfoundedaswell.Thiscontrolstrategyofthisthesisisconcentratingonthecontrolstrategytoimprovetheperformanceofgearshiftsintwomainaspects:depressingthelongitudinaljerkanddecreasingthefrictionalenergydissipati

7、on.Themodelreferencecontrolmethod(MRC)isproposedandappliedtorealizethegoals,andthefinal‘locked’modeoftheDCTgearshiftischosenasthereferencedmodeltoinstructtherunningdirectionoftheplant.Finally,analyticalmodelshavebeensetupontheplatformofMATLAB/Simulinkb

8、asedonthedynamicandmathematicalderivation,withnousageofprofessionaltoolboxes.Byinvestigatingthetransientresponsesofgearshiftingsimulation,ithasevidentlyshownthattheMRCmethodcangreatlyimprovetheperformanceofdual-clutchtransmissionbyreduc