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机械工程学院机械制造及其自动化专业（本科）2008级机制二班

课题名称：

某变速箱上盖零件大批生产的

工艺工装设计

毕业论文（设计）起止时间：

2012年03月05日～05月25日（共12周）

学生姓名：

黄显竟学号：

指导教师：

邱全奎、冯俊

报告日期：

2012.03.17

theresearchsof

amtshiftingschedules

VehicularAutomaticTransmissioncanbedividedintothreetypes:

AutomaticTransmission（AT）,AutomatedMechanicalTransmission（AMT）andContinuouslyVariableTransmission（CVT）.AMTthatisfullofpotentiality,duetoitsAMTshiftingperformanceiskeytechnologyinthedeveloping.ShiftingperformancedirectlyinfluencethemarketcompetitionandindustrializationofAMT.

AMT,butduringtheshiftingprocedure,thepowermustbecutoffwhichcausesthepoorshiftingperformancethanATandCVT.Onlythroughimprovingtheshiftingperformancecanthecommercialcompetencebeestablished.Sothevirtualimportantthingistofindthewaytoimproveshiftingperformance.

ThedevelopmentofAMTcanbedividedintothreephases:

semi-automatic,automaticandintelligent.ThetwomajorpartofAMTare:

theatshiftqualityisanimportantprobleminthedomainofATresearching.ShiftqualitycontrolofATisaccomplishedbyelectronicandimprovetheATshiftquality,andgivesthematerialcalculatedmethodsoftheAG4AT.ThispapersimulatestheAG4AT’sshiftingprocessof2Hto3H.Theresultsofthesimulationvalidatetheestablishedsimplifiedmodelsandtheexpectedoilpressurechangingcurve.

ThispaperfullyanalyzesthemechanismofthepressureregulatingandflowcontrollingsystemoftheAG4AT,andpreparatorydiscussesthedesignoftheblock-diagramoftheshiftqualitycontrol.Thispapertestthecontrolsystemandoftheseanalyses.

AutomatedMechanicalTransmission,assocalledAMT,isanew-styletransmissionsystem.AMTtechnologyappliestheautomatictechnologytothemanualmechanicaltransmissionandmakestheselection-gear,shift,clutchandthrottleimplementautomatically.AMTtechnologyissuitableforthesituationofourcountry,andexpansivemarketanddevelopmentforeground.ShiftschedulesdecidethetimetoshiftandarethesouloftheAMT.WhentheAMTisworking,bycomparingthestatesofthevehiclewiththeoptimalshiftschedules,theAMTdecidestheoptimalshifttimeandachievestheshiftautomatically.Thiswilllessenthetirednessofthedriverandimprovethesafety.Atthesametime,thepowerandfuel-economyofthevehiclecanalsobeimproved.TheauthorchoosestheshiftscheduleasthekeytechnologyproblemtoberesearchedandthemainstudyaimofthisthesisistogettheoptimalshiftschedulesfortheAMTandsoimprovethepowerandfuel-economyofthevehicle.Throughanalyzingtheinfluencefactorsofpowerandfuel-economyfortheautomobile,theauthorgettheestablishmentmethodsfortheoptimal-powershiftscheduleandoptimalfuel-economyshiftschedule.Inordertosolvetheinfluenceofmassontheshiftschedule,theauthorpresentsavariable-structure-controlledshiftsystem.Thisenrichesthetheoryofshiftschedules.Becausethecomputersimulationcansavealotofmanpowerandmaterialresourcescomparingwiththetrue-cartest,sointhisthesis,theauthorusesthesimulationtoolboxMatlabSimulatetosetupthesimulationmodelforshiftschedules.Usingthismodel,theoptimal-powershiftscheduleandoptimalfuel-economyshiftscheduleabovearesimulatedandprovedtobereasonable.

Shiftingperformanceisdefinedastheextentofswiftnessandsoftnessduringtheprocedureofnon-powershiftingandtoextendthelifeofthepowertrain.Theindexiscomfortofpassenger,timedurationandshock,ninefactorsmaybeinfluencetheshiftingperformance,andtwoexperimentalmethodscanbeusedtoinvestigatethenatureofthisperformance:

oneiscollectingreal-timedataduringroadexperimentandanalyzingthem,theotheristhesimulationoftheoperationconditionsofthevehicle.

ThecoreoftheAMTsystemisthecontrolstrategy,theprincipleoftheclutchengagement,shiftingprocedure,thechoiceofcontrolmethodandtheCANcommunicationbetweenTCUandECUcaninfluencetheshiftingperformance.

Shiftingscheduleisthescheduleofautoshiftingtimebetweentwoshiftswithcontrollingparameters.Itincludeseconomicalanddynamicalshiftingschedule.Atpresent,shiftingscheduleoftwocontrollingparameters（vehiclespeedandopeningonthrottle）ismainlyused.Ifshiftingscheduleisnotgood,shiftingwillnotatrighttimeandtheworkingconditionofenginewillbesevere.Itwillmakethesoundofengineabnormallyandstabilitybadlythroughthewholeshiftingprocession.SometimesevenflameoutScheduleofclutchengagementisdeterminedbyreleasingjourneyofclutch,openingofthrottle,shifting,vehiclespeedandloading.Themain

Controllinggoalsareengagingquantityandengagingspeed.Theengagingcontrolofclutchismainlyreferredtothe