中英文文献翻译自动变速器换档规律的研究Word文档下载推荐.docx

中英文文献翻译自动变速器换档规律的研究Word文档下载推荐.docx

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VehicularAutomaticTransmissioncanbedividedintothreetypes:

AutomaticTransmission（AT）,AutomatedMechanicalTransmission（AMT）andContinuouslyVariableTransmission（CVT）.AMThasbecomeakindoftransmissionthatisfullofpotentiality,duetoitshightransferefficiency,lowcostandeasinesstomanufacture.

TheresearchonAMTshiftingperformanceiskeytechnologyinthedeveloping.ShiftingperformancedirectlyinfluencethemarketcompetitionandindustrializationofAMT.

AMThasgoodmarketexpectation,butduringtheshiftingprocedure,thepowermustbecutoffwhichcausesthepoorshiftingperformancethanATandCVT.Onlythroughimprovingtheshiftingperformancecanthecommercialcompetencebeestablished.Sothevirtualimportantthingistofindthewaytoimproveshiftingperformance.

ThedevelopmentofAMTcanbedividedintothreephases:

semi-automatic,automaticandintelligent.ThetwomajorpartofAMTare:

thehardwareincludingthemasteredobject,executor,sensorsandTCU;

andthesoftwareperformingthecontrolstrategy.

TheperformanceofATshiftinfluencesgreatlytheperformanceofthevehicle.SotheresearchonatshiftqualityisanimportantprobleminthedomainofATresearching.ShiftqualitycontrolofATisaccomplishedbyelectronicandhydraulicsystem.Toshiftsmoothly,accordingtherealtimethrottlevalveopeningandvehiclespeedsignal,thecontrollersendselectronicsignalstocontroloilpressurechangingcurveoftheapplyingelements.thispaperanalyzesandresearchdetailedshiftqualitycontrolsystem，theanalyzingmodelofshiftingprocessandpressurechangingcurveoftheapplyingelements

Firstlythispapersummarizestheexistingevaluatedquotaofshiftquality,andfullyanalyzesandintroducestheexistingcontrolmannerofATshiftquality.

Tomeettheneedsofresearchofvehiclestartingandtherealtimecontrolofshift,thispaperputsforwardasimplifiedmodelofengine-torqueandadynamicsmodelofATshiftingprocess.Throughtheapplyingoftheestablishedmodel,thispaperfullyanalyzestheprocessoftheATshifting.

ThispaperdraftstheproperoilpressurechangingcurveoftheapplyingelementswhichcanimprovetheATshiftquality,andgivesthematerialcalculatedmethodsoftheAG4AT.ThispapersimulatestheAG4AT’sshiftingprocessof2Hto3H.Theresultsofthesimulationvalidatetheestablishedsimplifiedmodelsandtheexpectedoilpressurechangingcurve.

ThispaperfullyanalyzesthemechanismofthepressureregulatingandflowcontrollingsystemoftheAG4AT,andpreparatorydiscussesthedesignoftheblock-diagramoftheshiftqualitycontrol.ThispapertestthecontrolsystemandhydraulicsystemoftheAG4ATbytheAThydraulic-electronictesting-bed.Theresultofthetestvalidatesthecorrectionoftheseanalyses.

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

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

oneiscollectingreal-timedataduringroadexperimentandanalyzingthem,theotheristhesimulationoftheoperationconditionsofthevehicle.

ThecoreoftheAMTsystemisthecontrolstrategy,theprincipleoftheclutchengagement,shiftingprocedure,thechoiceofcontrolmethodandtheCANcommunicationbetweenTCUandECUcaninfluencetheshiftingperformance.

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

Controllinggoalsareengagingquantityandengagingspeed.Theengagingcontrolofclutchismainlyreferredtothecontrolofengagingspeed.Itisdividedintothreestages:

fast,slow,fast.Shiftingqualityisdirectlyinfluencedbythesecondstage.Ifengagingharder,itwillmakeshiftingconcussion,evenflameout;

ifengagingmoreslowly,itwillmakethefrictiontimelongerandreduceitslongevity.Themaincontrollingparametersaredifferencebetweeninitiativeandpassiveandtorquesonbothsides.Whentorquesbeingapproximatelyequal,itisprovedbyexperimentsthatitcanguaranteeshiftingtimeandnotmakeconcussionthroughtheprocessionofengagementatthetimeofdifferenceofrotatingspeedbelowsomevalue.Meanwhile,theabrasionofclutchisnotsevere.

Shiftingprocedureistheprocedurethroughworkingharmoniouslyamongengine,clutchandtransmission.Theircooperationwillaffectshiftingtimeheavily.Inordertodecreasetheshiftingtime,thetimethatisspentonthefrictionoftheclutchshouldbedecreasedfirst.Ifweintendtoincreasethetimeofnon-loadstage,whichhelpstominimizethedifferenceoftherotaryspeedbetweenthedrivingdiscandthedrivendisc.Ifweintendtoshortenthetimeofthenon-loadstage,engagetheclutchimmediatelyafterthegearchange.Theclutchcanengageinasatisfyingperiodifthenewmethodofcontrollingtheengagingspeedoftheclutchisrealizable.Andthetimethatisspentonsynchronizingthegearsshouldalsobeshortened.Itcanberealizedinthefollowingtwoways.Thefirstistodecreasethedifferenceofthedrivinggearandthedrivengear.Thesecondistoincreasetheshiftingforce.IfrealizingtheunioncontrolbetweenECUandTCUbyCANbus,AMThasthebestcontrolandthebestshiftingperformancebyuseofcommunicationstrategybetweenTCUandECU.

Influenceonshiftingperformancebyhardware

TheelementsinhardwaresystemarethebasisofproperfunctionsofAMT.Executors,sensors,electroniccomponents,hydraulicsystemshaveinfluencesonshiftingperformance,thechoiceofhardwareparametersisofvitalimportanttoimprovementofshiftingperformance.

Withthedevelopmentofthetheoryandtechnologyofvehicle,thetechnicalincreasinglymatureofmicroprocessorandtheextensiveapplicationofelectronictechniqueonthecar,peoplehavenolimitatsatisfyingtheautomotivemeansoftransportationonly,facinggraduallyfromtherequestofthecarpower,economyandeasilymanipulating,flexibility,safety,andtheintelligenttypeofcarbecomesthefocusinthevisionofpeopleincreasingly.Company’spublicitysloganof"

person,car,life"

"

makepeoplethecenter"

etc.Onthesideexhibittheexpectationofpeopletotheautomotiveindividuation,humanity.

Inthedevelopmentdirectionofthecarintelligence,theintelligenceoftheautomaticgearboxhasimportanteffect.Buttheintelligenceoftheautomaticgearboxembodiesattheestablishmentoftheshiftregulation.Forthefashion,forsatisfyingpeopletothenewautomotiverequest,forcompetitiveadvantageofthecartype,atpresent,eachbigfactoryinworldworkedverymuchinshiftregulationofnewcartype.Amongthose,themostarrestingisAL4automaticgearboxdevelopedbyPEUGEOT/CITROENandRENAULTinthatthereunexpectedlyarethe10kindsofsomanyshiftregulations.Inthebigsystemofperson—car—road,thegoodandbadofthecarcontrol,reflectprimarilyinthecoordinationofthevehicleandenvironment（road）,thecoordinationofthevehicleandperson.Andso,theelectronicautomaticcontrolsystemcansavevariousregulationstoprovidethedrivertochoosetouse,notonlyhavingtheeconomicregulation,motive（calltosportthetypeagain）regulation,butalsostillhavin