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1、Driveforcecontrolofaparallel-serieshybridsystemAbstractSinceeachcomponentofahybridsystemhasitsownlimitofperformance,thevehiclepowerdependsontheweakestcomponent.Soitisnecessarytodesignthebalanceofthecomponents・Thevehiclemustbecontrolledlooperatewithintheperformancerangeofallthecomponents・We
2、designedthespecificationsofeachcomponentbackwardfromtherequireddriveforce・Inthispaperwcdescribeacontrolmethodforthemotortorquetoavoiddamagetothebattery,whenthebatteryisatalowstateofcharge・SocietyofAutomotiveEngineersofJapan,Inc・andElsevierScienceB・V.Allrightsreserved・1.IntroductionInrecent
3、years,vehicleswithinternalcombustionengineshaveincreasinglyplayedanimportantroleasameansoftransportation,andarecontributingmuchtothedevelopmentofsociety.However,vehicleemissionscontributetoairpollutionandpossiblyevenglobalwarming,whichrequireeffectivecountermeasures・Variousdevelopmentsareb
4、eingmadetoreducetheseemissions,butnofurtherlargeimprovementscanbeexpectedfrommerelyimprovingthecuiTentenginesandtransmissions.Thus,greatexpectationsarebeingplacedonthedevelopmentofelectric,hybridandnaturalgas-drivenvehicles.Judgingfromcurrentlyapplicabletechnologies,andthecurrentlyinstalle
5、dinfrastructureofgasolinestations,inspectionandservicefacilities,thehybridvehicle,drivenbythecombinationofgasolineengineandelectricmotor,isconsideredtobeoneofthemostrealisticsolutions.Generallyspeaking,hybridsystemsareclassifiedasseriesorparallelsystems・AtToyota,wehavedevelopedtheToyotaHyb
6、ridSystem(hereinafterreferredtoastheTHS)bycombiningtheadvantagesofbothsystems.InthissensetheTHScouldbeclassifiedasaparallel-seriestypeofsystem.SincetheTHSconstantlyoptimizesengineoperation,emissionsarecleanerandbetterfueleconomycanbeachieved.Duringbraking,Kineticenergyisrecoveredbythemotor
7、,therebyreducingfuelconsumptionandsubsequentCO?emissions.EmissionsandfueleconomyaregreatlyimprovedbyusingtheTHSforthepowertrainsystem.However,theTHSincorporatesengine,motor,batteryandothercomponents,eachofwhichhasitsownparticularcapability.Inotherwords,thedriv
