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1、Driveforcecontrolofaparallel-serieshybridsystemAbstractSinceeachcomponentofahybridsystemhasitsownlimitofperformance,thevehiclepowerdependsontheweakestcomponent.Soitisnecessarytodesignthebalanceofthecomponents.Thevehiclemustbecontrolledtooperatewithintheperformance
2、rangeofallthecomponents.Wedesignedthespecificationsofeachcomponentbackwardfromtherequireddriveforce.Inthispaperwedescribeacontrolmethodforthemotortorquetoavoiddamagetothebattery,whenthebatteryisatalowstateofcharge.SocietyofAutomotiveEngineersofJapan,Inc.andElsevie
3、rScienceB.V.Allrightsreserved.1.IntroductionInrecentyears,vehicleswithinternalcombustionengineshaveincreasinglyplayedanimportantroleasameansoftransportation,andarecontributingmuchtothedevelopmentofsociety.However,vehicleemissionscontributetoairpollutionandpossibly
4、evenglobalwarming,whichrequireeffectivecountermeasures.Variousdevelopmentsarebeingmadetoreducetheseemissions,butnofurtherlargeimprovementscanbeexpectedfrommerelyimprovingthecurrentenginesandtransmissions.Thus,greatexpectationsarebeingplacedonthedevelopmentofelectr
5、ic,hybridandnaturalgas-drivenvehicles.Judgingfromcurrentlyapplicabletechnologies,andthecurrentlyinstalledinfrastructureofgasolinestations,inspectionandservicefacilities,thehybridvehicle,drivenbythecombinationofgasolineengineandelectricmotor,isconsideredtobeoneofth
6、emostrealisticsolutions.Generallyspeaking,hybridsystemsareclassifiedasseriesorparallelsystems.AtToyota,wehavedevelopedtheToyotaHybridSystem(hereinafterreferredtoastheTHS)bycombiningtheadvantagesofbothsystems.InthissensetheTHScouldbeclassifiedasaparallel-seriestype
7、ofsystem.SincetheTHSconstantlyoptimizesengineoperation,emissionsarecleanerandbetterfueleconomycanbeachieved.Duringbraking,Kineticenergyisrecoveredbythemotor,therebyreducingfuelconsumptionandsubsequentCO2emissions.Emissionsandfueleconomyaregreatlyimprovedbyusingthe
8、THSforthepowertrainsystem.However,theTHSincorporatesengine,motor,batteryandothercomponents,eachofwhichhasitsownparticularcapability.Inotherwords,thedriv
