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1、HybridControlofAutomotivePowertrainSystems:ACaseStudy*AliBeydoun,**LeYiWang***,JingSunandShivaSivashankart1IntroductionThispaperisconcernedwiththeproblemofhybridcontrolstrategiesforauto-motivepowertrainsystems.Automotivesystemsrepresentanimportantclassofpracticalhybridsyste
2、mswhicharecharacterizedbythefollowingfeatures:1.Thesystemsareinherentlyhybrid,i.e.,hybridcontrolisnotmerelyachoice.Thisisexemplifiedbytransmissiongearpositions(discrete)andenginethrottlecontrol(analog).2.Systemdynamicsarehighlynonlinearandcontainparametricerrorsandstructura
3、luncertainties.Anymodelthatissuitableforcontrolsystemde-velopmentwillinevitablycontainlargemodelingerrors.Inthispaper,ahybridcontroldesignapproachisusedtodevelopcontrolstrategiesforcoordinationofautomotiveengineandtransmissionsystems.Themaingoalistoimprovesystemperformance,
4、fueleconomy,robustness,andotherperformancespecifications.Thedesignprocedurefollowscloselythemainideasofthemethodintroducedrecentlyin[4].Themethodemploysperformancein-dicesinguidingbothanaloganddiscretecontrolactionssuchthatrobuststabil-ityandperformanceofclosed-loophybridsy
5、stemsaremaintained,inthepres-enceofmodelingerrors,disturbances,andstructuraluncertainties.Themethod,however,mustbemodifiedsignificantlyinthiscasestudytoaccommodateprac-ticalconstraints,includingactuatorsaturations,gearshiftinglimitations,andreal-timecomputationrequirements.
6、1.1AutomotivePowertrainHybridSystemsConsideratypicalautomotivepowertralnsystemshowninFigure1.Dependingonenginemechanicalconfigurations,controlsignalsmayincludethrottleangle0ThisresearchissupportedinpartbyNSFGrantECS-9634375andseveralresearchgrantsfromFordMotorCompany.*~Adva
7、ncedVehicleTechnology,FordMotorCompany,MailDrop76,21500OakwoodBlvd.,Dearborn,Michigan48121.***DepartmentofElectricalEngineering,WayneStateUniversity,Detroit,Michigan48202,Tel.:313-577-4715,Fax:313-577-1101,Emall:lywang@ece.eng.wayne.edutFordMotorCompany,ScientificResearchLa
8、boratory,P.O.Box2053,MD2036,Dearborn,Michigan48121-205334(whichiscontrolledeitherm
