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1、Driveforcecontrolofaparallel-serieshybridsystemAbstractSinceeachcomponentofahybridsystemhasitsownlimitofperformance,thevehiclepowerdependsontheweakestcomponent.Soitisnecessarytodesignthebalanceofthecomponents.Thevehiclemustbecontrolledtooperatewithintheperformanceran
2、geofallthecomponents.Wedesignedthespecificationsofeachcomponentbackwardfromtherequireddriveforce.Inthispaperwedescribeacontrolmethodforthemotortorquetoavoiddamagetothebattery,whenthebatteryisatalowstateofcharge.SocietyofAutomotiveEngineersofJapan,Inc.andElsevierScien
3、ceB.V.Allrightsreserved.1.IntroductionInrecentyears,vehicleswithinternalcombustionengineshaveincreasinglyplayedanimportantroleasameansoftransportation,andarecontributingmuchtothedevelopmentofsociety.However,vehicleemissionscontributetoairpollutionandpossiblyevengloba
4、lwarming,whichrequireeffectivecountermeasures.Variousdevelopmentsarebeingmadetoreducetheseemissions,butnofurtherlargeimprovementscanbeexpectedfrommerelyimprovingthecurrentenginesandtransmissions.Thus,greatexpectationsarebeingplacedonthedevelopmentofelectric,hybridand
5、naturalgas-drivenvehicles.Judgingfromcurrentlyapplicabletechnologies,andthecurrentlyinstalledinfrastructureofgasolinestations,inspectionandservicefacilities,thehybridvehicle,drivenbythecombinationofgasolineengineandelectricmotor,isconsideredtobeoneofthemostrealistics
6、olutions.Generallyspeaking,hybridsystemsareclassifiedasseriesorparallelsystems.AtToyota,wehavedevelopedtheToyotaHybridSystem(hereinafterreferredtoastheTHS)bycombiningtheadvantagesofbothsystems.InthissensetheTHScouldbeclassifiedasaparallel-seriestypeofsystem.SincetheT
7、HSconstantlyoptimizesengineoperation,emissionsarecleanerandbetterfueleconomycanbeachieved.Duringbraking,Kineticenergyisrecoveredbythemotor,therebyreducingfuelconsumptionandsubsequentCO2emissions.EmissionsandfueleconomyaregreatlyimprovedbyusingtheTHSforthepowertrainsy
8、stem.However,theTHSincorporatesengine,motor,batteryandothercomponents,eachofwhichhasitsownparticularcapability.Inotherwords,thedriv
