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附录附录1英文原文High-PerformanceAutomotiveEngineControlinEngineTesterMichitakaHori(MemberIEEE)MasahikoSuzuki(MemberIEEJ)MasakatsuNomurawemberIEEE)MasayukiTerashimamemberIEEE)MeidenshaCorporationAbstractThispaperpresentsanoveldecouplingcontrolmethodontheenginetorquecontrolfortheautomotiveenginetester.Theenginetesterismainlycomposedofadynamometercontrolsystemandanenginecontrolsystem.Theconventionalenginetesterhastheproblemthattheperformanceoftheenginetorquecontrolsystemisdeterioratedbytheinfluencesoftheinterferencebetweenthedynamometerspeedcontrolsystemandtheenginetorquecontrolsystem.Theauthorsproposedthepracticalenginetorquecontrolsystembasedonanobserverandanidentificationsystemtoeliminatetheinferenceofdynamometerspeedcontrolsystem.Theeffectofobserversparameterserrorontheenginetorqueestimationresponsewasanalyzed.Accordingtotheresultofthisanalysis,apracticalmethodisproposedtoidentifytheengineinertiamomentandtheshaftspringcoefficientthatareparametersoftheobserver.Theauthorsconfirmedthattheproposeddecouplingenginetorquecontrolsystemrealizedarobustcontrolsystemfromtheinterferencewiththedynamometerspeedcontrolsystemthroughsimulationandexperiments.I.IntroductionRecently,environmentalprotectionisoneofthemostimportantproblemsintheworld,andtheexhaustgasfromautomobilesisalsostrictlyregulatedbylaw.Undersuchcircumstances,theperformanceofautomotiveenginesisimprovingyearbyyear,andenginetesters,whichareusedtomeasureenginecharacteristics,arerequiredtohavehighcontrolability.However,intheconventionaltorquecontrolofengines,dynamometertorqueorshafttorqueisappliedasafeedbackvariableinsteadofenginetorquebecausetheenginetorquecannotbedetecteddirectlybecauseofitsstructure.Asaresult,thereisacouplingbetweentorquecontrolandspeedcontrol.Forthereasongivenabove,ithasbeendifficulttoattainhighcontrolabilityintheconventionalsystems.Theauthorshaveproposedanapproachtoeliminateaninterferencecomponentfromthedynamometerspeedcontrolsystem,throughestimationofenginetorqueusinganobserverandidentificationsystem.Theeffectofobserversparameterserroronthetorqueestimationresponsewasanalyzed.Accordingtotheresultofthisanalysis,apracticalmethodisproposedtoidentifytheengineinertiamomentandtheshaftspringcoefficientwhichareparametersoftheobserver.Weconfirmedthattheproposedenginetorquecontrolsystemrealizedarobustcontrolsystemfromtheinterferencewiththedynamometercontrolsystem.Theeffectivenessofthiscontrolsystemhasbeenconfirmedthroughsimulationsandexperiments.II.ConfigurationofEngineTesterandTestmethodA.ConfigurationofConventionalEngineTesterFig.1showsaconfigurationofaconventionalenginetester.Theenginetesterconsistsofanenginetobetested,adynamometer,andanactuatorthatregulatesthethrottlevalve.Inthissystem,theenginetorqueiscontrolledbyregulatingthepositionofthethrottlevalvethatisconnectedtotheactuatorbyawire.Detectedvariablesarethedynamometertorqueandspeed,andtheactuatorposition.Theenginecontrolleriscomposedof12-bitAID,D/AconvertersandaDSP(TMS320C25).B.EngineTestMethodTheengineistestedforitsperformanceoneachdrivingmodeshowninTable1.TheEnginespeedortorqueismaintainedtothepredeterminedpattern,whiletheexhaustgasandfuelcostaremeasured.Theengineperformanceisevaluatedbasedontheresultofmeasurements.Fig.2showstheblockdiagramofthecontrolsystemofthedrivingmode1showninTable1.Theenginetorquecanbedetecteddirectlyusingbytheindicatedmeaneffectivepressureintheory.However,inpractice,itisdifficulttodetecttheenginetorquedirectlybecauseofitsstructure.Intheconventionalenginetesting,thedynamometertorqueisappliedasafeedbackvariableinsteadoftheenginetorqueasshowninFig.2.Theenginetorquecontrolsystemisaffectedbytheaccelerationtorqueofthedynamometerinatransientcondition.Asaresult,Theperformanceoftheenginetorquecontrolsystemisdeteriorated.Weapplyanenginetorqueobservertoeliminatefrominterferenceofdynamometerspeedcontrolsystemintheenginetorquecontrol.Ill.DecouplingControlMethodA.EngineTorqueEstimationMethodTheenginetesterisequivalenttoatwo-massmodelofadynamometerandanengine.Weattemptedtoestimatetheenginetorquebytheuseofareducedorderobserver.Thestate-spacerepresentationforatwo-mass-modelshowninFig.3isasfollows,wheretheviscositytermisneglected.Theestimatedvariablesaretheenginetorque,theenginespeed,andtheshafttorque.Thereducedorderobserverequationsaregivenbelow.where,2,TaPEENXTTisfortheestimatedstatevectors.ValueList
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