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外文翻译--马自达公司的速度感应四轮转向系统.doc

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外文翻译--马自达公司的速度感应四轮转向系统.doc

英文全文THEMAZDASPEEDSENSINGCOMPUTERISED4WHEELSTEERINGSYSTEMTHEMAZDASPEEDSENSINGCOMPUTERISED4WHEELSTEERINGTHEMAZDASPEEDSENSINGCOMPUTERISED4WHEELSTEERINGSYSTEMTHREEANDAHALFDECADESAGO,WELLCALCULATEDCONCLUSIONTHATPRESENTATIONCONFERENCE,ATTHEOCTOBER26,TWOYOUNGMAZDADESIGNERSARRIVEDATAFARSIGHTEDANDWASQUITEREVOLUTIONARYFORTHETIMEINTHEIRTECHNICAL1962JAPANESEAUTOMOTIVEENGINEERSSOCIETYTECHNICALDRTADASHIOKADACONCERNINGVEHICLEDYNAMICSASANDENGINEERTOSHIAKISUMMARISEDTHEIRARDUOUSRESEARCHFOLLOWS1THEBASICDIFFERENCEINTHECHARACTERISTICSOFOVERSTEERANDUNDERSTEERLIESINTHEMAGNITUDEOFTIMEDELAYANDRESPONSE2AVEHICLETHATISSTABLEUNDERHIGHSPEEDMUSTPOSSESSUNDERSTEERCHARACTERISTICS3THEREARWHEELTYREREFLECTSHEAVILYONTHESTABILITYANDAMAJORIMPROVEMENTONCONTROLANDSTABILITYMAYBEANTICIPATEDBYMEANSOFTHEAUTOMATICREARWHEELSTEERINGSYSTEMTHECONCLUSIONSANDFORMULATIONSPRESENTEDBYTHESETWOENGINEERSESTABLISHEDTHEFOUNDATIONFORMAZDASPRESENTDAYREPUTEDSUSPENSIONTECHNOLOGYOVERYEARSOFDEDICATEDRESEARCHANDDEVELOPMENTEXPERTISE,THEIRORIGINALDISCOVERIESANDTHEORIESHAVECONTRIBUTEDTOSOMEOFTHEMOSTSIGNIFICANTACHIEVEMENTSWITHINTHERECENTHISTORYOFAUTOMOTIVECHASSISENGINEERING,INCORPORATEDBYMAZDAWITHINITSSERIESPRODUCTIONPRODUCTSTHESEDEVELOPMENTSINCLUDETHETWINTRAPEZOIDALLINKREARSUSPENSION,FIRSTEMPLOYEDINTHEORIGINALFRONTWHEELDRIVEMAZDA3231980ANDTHEMAZDA6261982},ANDTHENPERFECTEDWITHINTHEUPDATEDMAZD626;THEAWARDWINNINGDYNAMICTRACKINGSUSPENSIONSYSTEMOFTHESECONDGENERATIONMAZDARX71985;ANDTHEELABORATEELINKREARSUSPENSIONOFTHENEWMAZDA9291987WHILEVARIOUSEXTERNALFORCESANDLOADSAREEXERTEDTOTHEREARWHEELSOFAVEHICLEASITCOMBATSTHEELEMENTSOFTHELAWOFMOTIONASDEFINEDBYSIRISAACNEWTON,THESENEWSUSPENSIONSYSTEMSCONVERTTHOSEFORCESINTO4WSEFFECTSWHICHPOSITIVELYAIDINVEHICLESTABILITYANDAGILITYTHEMAZDADESIGNERSANDENGINEERSULTIMATEGOALWASSTILLAPOSITIVEMEASURETOGENERATEFORCESFORPOSITIVECONTROLS;AFOURWHEELSTEERINGSYSTEMIN1983,MAZDAASTONISHEDTHEAUTOMOTIVEWORLDWITHTHEINTRODUCTIONOFANENGINEERINGCONCEPTCAR,THEMX02,EXHIBITEDATTHETOKYOMOTORSHOWTHISFOURDOORSEDAN,WITHGENEROUSPASSENGERACCOMMODATIONONANUNUSUALLYLONGWHEELBASE,INCORPORATEDAMONGITSNUMEROUSADVANCEDFEATURESATRUE4WSSYSTEMTHATAIDEDHIGHSPEEDSTABILITYASWELLASITSLOWSPEEDMANOEUVRINGTHEDEGREEOFREARWHEELSTEERINGWASDETERMINEDBYTHEMEASUREMENTOFBOTHFRONTWHEELSTEERINGANGLEANDVEHICLESPEED,BYMEANSOFACENTRALCOMPUTERUNITTHEMX02WASFOLLOWEDBYANOTHEREXCITINGCONCEPTCAR;THEMX03,FIRSTEXHIBITEDATTHEFRANKFURTMOTORSHOWINSEPTEMBER1985THISSLEEKFOURSEATFUTURISTICCOUPEOFTHE1990SCOMBINEDAREFINEDELECTRONICALLYCONTROLLED4WSSYSTEMWITHACONTINUALLYVARYINGTORQUESPLIT,FOURWHEELDRIVESYSTEMANDAPOWERFULTHREEROTARYENGINEMAZDAELECTRONICALLY一CONTROLLEDFOURWHEELSTEERINGSYSTEMABENEFICIALTECHNOLOGYMAZDASELECTRONICALLYCONTROLLED,VEHICLESPEEDSENSINGFOURWHEELSTEERINGSYSTEM4WS}STEERSTHEREARWHEELSINADIRECTIONANDTOADEGREEMOSTSUITEDTOACORRESPONDINGVEHICLESPEEDRANGETHESYSTEMISMECHANICALLYANDHYDRAULICALLYACTUATED,PRODUCINGGREATLYENHANCEDSTABILITY,ANDWITHINCERTAINPARAMETERS,AGILITYTHEDRIVEROFAMAZDA4W5EQUIPPEDCARDERIVESFIVESTRATEGICBENEFITS,OVERANDABOVETHECONVENTIONALVEHICLECHASSIS1SUPERIORCORNERINGSTABILITY2IMPROVEDSTEERINGRESPONSIVENESSANDPRECISION3HIGHSPEEDSTRAIGHTLINESTABILITY4NOTABLEIMPROVEMENTINRAPIDLANECHANGINGMANOEUVRES5SMALLERTURNINGRADIUSANDTIGHTSPACEMANOEUVRABILITYATLOWVEHICLESPEEDRANGETHEMOSTOUTSTANDINGADVANTAGEOFTHEMAZDA4WSISTHATITCONTRIBUTESTOANOTABLEREDUCTIONINDRIVERFATIGUEOVERHIGHSPEEDANDEXTENDEDTRAVELLINGTHISISACHIEVEDBYOPTIMALLY1REDUCINGTHERESPONSEDELAYTOSTEERINGINPUTANDACTIONAND2ELIMINATINGTHEVEHICLESEXCESSIVEREACTIONTOSTEERINGINPUTINESSENCE,BYPROVIDINGTHEOPTIMUMSOLUTIONTOTHEPHENOMENARESEARCHEDBYTHETWOYOUNGMAZDAENGINEERSINTHEEARLYSIXTIES一BYTHEMETHODADVOCATEDBYTHEM一THE4WSSYSTEMHASEMERGEDASAFULLYBENEFICIALTECHNOLOGYSTRATEGICCONSTRUCTIONTHEMAZDA4WSCONSISTSOFARACKANDPINIONFRONTSTEERINGSYSTEMTHATISHYDRAULICALLYASSISTEDBYATWINTANDEMPUMPMAINPOWERSOURCE,WITHANOVERALLSTEERINGRATIOOF1421THEREARWHEELSTEERINGMECHANISMISALSOHYDRAULICALLYASSISTEDBYTHEMAINPUMPANDELECTRONICALLYCONTROLLED一ACCORDINGTOTHEFRONTSTEERINGANGLEANDVEHICLESPEEDTHEREARSTEERINGSHAFTEXTENDSFROMTHERACKBAROFTHEFRONTSTEERINGGEARASSEMBLYTOTHEREARSTEERINGPHASECONTROLUNITTHEREARSTEERINGSYSTEMISCOMPRISEDOFTHEINPUTENDOFTHEREARSTEERINGSHAFT,VEHICLESPEEDSENSORS,ASTEERINGPHASECONTROLUNIT{DETERMININGDIRECTIONANDDEGREE,APOWERCYLINDERANDANOUTPUTRODACENTERINGLOCKSPRINGISINCORPORATED,WHICHLOCKSTHEREARSYSTEMINANEUTRALSTRAIGHTFORWARD}POSITIONINTHEEVENTOFHYDRAULICFAILUREADDITIONALLY,ASOLENOIDVALVETHATDISENGAGESHYDRAULICASSISTTHEREBYACTIVATINGTHECENTERINGLOCKSPRING}INCASEOFANELECTRICALFAILUREISINELUDEDTHE4WSSYSTEMVARIESTHEPHASEANDRATIOOFTHEREARWHEELSTEERINGTOTHEFRONTWHEELS,ACCORDINGTOTHEVEHICLESPEEDITSTEERSTHEREARWHEELSTOWARDTHEOPPOSITEPHASEDIRECTION}OFTHEFRONTWHEELDURINGSPEEDSLESSTHAN35KMLH22MPH}FORATIGHTERTURNANDNEUTRALIZESTHEMTOASTRAIGHTFORWARDDIRECTION,ASINACONVENTIONALTWOWHEELSTEERINGPRINCIPLE}AT35KMLH22MPH}ABOVETHATSPEED,THESYSTEMSTEERSTOWARDTHESAMEPHASEDIRECTIONASTHEFRONTWHEELS,THEREBYGENERATINGANINCREASEDCORNERINGFORCEFORSTABILITYTHEMAXIMUNSTEERINGANGLEOFTHE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