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1、Mechatronics12(2002)447–459ControllogicforanelectricpowersteeringsystemusingassistmotorJi-HoonKim,Jae-BokSong*DepartmentofMechanicalEngineering,KoreaUniversity,5Anam-dong,Sungbuk-gu,Seoul136-701,SouthKoreaReceived20March2000;accepted13October2000Abstra
2、ctElectricpowersteering(EPS)systemshavemanyadvantagesovertraditionalhydraulicpowersteeringsystemsinengineefficiency,spaceefficiency,andenvironmentalcompatibility.ThisresearchaimsatdevelopingEPScontrollogicforreductionofsteeringtorqueexertedbyadriver,realiz
3、ationofvarioussteeringfeels,andimprovementofreturn-to-centerperfor-mance.Inaddition,thetorquesensorcapableofmeasuringthesteeringtorqueandsteeringwheelangleisdevised,andthehardware-in-the-loopsimulation(HILS)systemthatcanim-plementanactualloadtorquedeli
4、veredtothesteeringcolumnisalsodeveloped.WiththeproposedEPSlogic,thedrivercanturnthesteeringwheelwiththesteeringtorquewhosemagnitudeisdeterminedfromatorquemapindependentofloadtorquesthattendtovarydependingonthedrivingconditions.Experimentalstudiesshowth
5、attheproposedEPScontrollogiccanimprovereturn-to-centerperformanceofthesteeringwheelbycontroloftheassistmotor.Ó2002ElsevierScienceLtd.Allrightsreserved.Keywords:Electricpowersteering;Steeringtorque;Torquesensor;Assistmotor;Activedamping1.IntroductionAst
6、eeringsystemisoneofmajorsubsystemsforvehicleoperation.Itrotatesthefrontwheelplaneinthedesireddirectionsetbythedriver’ssteeringinput.Whenthefrontwheelsaresteered,arestoringtorquewhichtendstoreturnthewheelstotheoriginalpositionarises.Althoughthisrestorin
7、gtorqueprovidessteeringstability,thedrivermustprovidesufficienttorquetoovercomethistorquetosteerthevehicle.*Correspondingauthor.Tel.:+82-2-3290-3363;fax:+82-2-3290-3757.E-mailaddress:jbsong@korea.ac.kr(J.-B.Song).0957-4158/02/$-seefrontmatterÓ2002Elsevie
8、rScienceLtd.Allrightsreserved.PII:S0957-4158(01)00004-6448J.-H.Kim,J.-B.Song/Mechatronics12(2002)447–459Sinceconsiderablesteeringeffortisrequiredforlargevehiclesparticularlyatlowspeeds,powersteeringwasintroducedtoassistthedriverinturning
