已阅读5页,还剩4页未读, 继续免费阅读
版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
英文全文TheMazdaSpeedSensingComputerised4-WheelSteeringSystem.theMazdaSpeedSensingComputerised4-WheelSteeringTheMazdaSpeedSensingComputerised4-WheelSteeringSystem.Threeandahalfdecadesago,well-calculatedconclusionthatpresentationConference,attheOctober26,twoyoungMazdadesignersarrivedatafar-sightedandwasquiterevolutionaryforthetime.Intheirtechnical1962JapaneseAutomotiveEngineersSocietyTechnicalDrTadashiOkadaconcerningvehicledynamicsasandengineerToshiakisummarisedtheirarduousresearchfollows.1Thebasicdifferenceinthecharacteristicsofoversteerandundersteerliesinthemagnitudeoftimedelayandresponse.2.avehiclethatisstableunderhighspeedmustpossessundersteercharacteristics3.therearwheeltyrereflectsheavilyonthestabilityandamajorimprovementoncontrolandstabilitymaybeanticipatedbymeansoftheautomaticrearwheelsteeringsystem.TheconclusionsandformulationspresentedbythesetwoengineersestablishedthefoundationforMazdaspresent-dayreputedsuspensiontechnology.Overyearsofdedicatedresearchanddevelopmentexpertise,theiroriginaldiscoveriesandtheorieshavecontributedtosomeofthemostsignificantachievementswithintherecenthistoryofautomotivechassisengineering,incorporatedbyMazdawithinitsseriesproductionproducts.Thesedevelopmentsincludethetwintrapezoidallinkrearsuspension,firstemployedintheoriginalfront-wheeldriveMazda323(1980)andtheMazda626(1982,andthenperfectedwithintheupdatedMazd626;theawardwinningDynamicTrackingSuspensionSystemofthesecondgenerationMazdaRX-7(1985);andtheelaborateE-linkrearsuspensionofthenewMazda929(1987).WhilevariousexternalforcesandloadsareexertedtotherearwheelsofavehicleasitcombatstheelementsofthelawofmotionasdefinedbySirIsaacNewton,thesenewsuspensionsystemsconvertthoseforcesinto4WSeffectswhichpositivelyaidinvehiclestabilityandagility.theMazdadesignersandengineersultimategoalwasstillapositivemeasuretogenerateforcesforpositivecontrols;aFour-WheelSteeringsystem.In1983,Mazdaastonishedtheautomotiveworldwiththeintroductionofanengineeringconceptcar,theMX-02,exhibitedattheTokyoMotorShow.Thisfour-doorSedan,withgenerouspassengeraccommodationonanunusuallylongwheelbase,incorporatedamongitsnumerousadvancedfeaturesatrue4WSsystemthataidedhigh-speedstabilityaswellasitslow-speedmanoeuvring.Thedegreeofrearwheelsteeringwasdeterminedbythemeasurementofbothfrontwheelsteeringangleandvehiclespeed,bymeansofacentralcomputerunit.TheMX-02wasfollowedbyanotherexcitingconceptcar;theMX-03,firstexhibitedattheFrankfurtMotorShowinSeptember1985.Thissleekfourseatfuturisticcoupeofthe1990scombinedarefinedelectronically-controlled4WSsystemwithacontinuallyvaryingtorque-split,four-wheeldrivesystemandapowerfulthree-rotaryengine.MazdaElectronically一ControlledFour-WheelSteeringSystem:ABeneficialTechnologyMazdaselectronically-controlled,vehicle-speed-sensingFour-WheelSteeringSystem(4WSsteerstherearwheelsinadirectionandtoadegreemostsuitedtoacorrespondingvehiclespeedrange.Thesystemismechanicallyandhydraulicallyactuated,producinggreatlyenhancedstability,andwithincertainparameters,agility.ThedriverofaMazda4W5-equippedcarderivesfivestrategicbenefits,overandabovetheconventionalvehiclechassis.1.Superiorcorneringstability2.Improvedsteeringresponsivenessandprecision3.High-speedstraightlinestability4.Notableimprovementinrapidlane-changingmanoeuvres5.Smallerturningradiusandtight-spacemanoeuvrabilityatlowvehiclespeedrangeThemostoutstandingadvantageoftheMazda4WSisthatitcontributestoanotablereductionindriverfatigueoverhigh-speedandextendedtravelling.Thisisachievedbyoptimally:1.reducingtheresponsedelaytosteeringinputandactionand2.eliminatingthevehiclesexcessivereactiontosteeringinputInessence,byprovidingtheoptimumsolutiontothephenomenaresearchedbythetwoyoungMazdaengineersintheearlysixties一bythemethodadvocatedbythem一the4WSsystemhasemergedasafullybeneficialtechnology.StrategicConstructionTheMazda4WSconsistsofarack-and-pinionfrontsteeringsystemthatishydraulicallyassistedbyatwin-tandempumpmainpowersource,withanoverallsteeringratioof14.2:1.Therearwheelsteeringmechanismisalsohydraulicallyassistedbythemainpumpandelectronicallycontrolled一accordingtothefrontsteeringangleandvehiclespeed.Therearsteeringshaftextendsfromtherackbarofthefrontsteeringgearassemblytotherearsteering-phasecontrolunit.Therearsteeringsystemiscomprisedoftheinputendoftherearsteeringshaft,vehiclespeedsensors,asteering-phasecontrolunitdeterminingdirectionanddegree),apowercylinderandanoutputrod.Acenteringlockspringisincorporated,whichlockstherearsysteminaneutral(straightforwardpositionintheeventofhydraulicfailure.Additionally,asolenoidvalvethatdisengageshydraulicassist(therebyactivatingthecenteringlockspringincaseofanelectricalfailureisineluded.The4WSsystemvariesthephaseandratiooftherear-wheelsteeringtothefrontwheels,accordingtothevehiclespeed.Itsteerstherearwheelstowardtheoppositephase(directionofthefrontwheelduringspeedslessthan35kmlh(22mphforatighterturnandneutralizesthem(toastraightforwarddirection,asinaconventionaltwo-wheelsteeringprincipleat35kmlh(22mph.Abovethatspeed,thesystemsteerstowardthesamephase-directionasthefrontwheels,therebygeneratinganincreasedcorneringforceforstability.Themaximunsteeringangleoftherearwheelsextends5degreestoeitherleftorright,ameasurementth敏Mazdahasdeterminedtobeoptimallyeffectiveandnaturaltohumansensitivity.PrimaryComponents1.VehiclespeedsensorsInterpretspeedometershelfrevolutionsandsendsignaltotheelectroniccomputerunit.twosensors,onewithinthespeedometerandtheotheratthetransmissionoutput,areusedtocrosschecktheotherforaccuracyandfailsafemeasures.2.SteeringphasecontrolunitConveystothepowersteeringcylinderboostervalvethedirectionandstrokeofrearwheelsteeringbythecombinedmovementofthecontrolyokeangleandbevelgearrevolutions.3.ElectricsteppermotorPerformsalteringoftheyokeangleandbevelgearphasing4.RearsteeringshaftTransmitsfrontwheelsteeringanglebyturningthesmallbevelgearinthesteeringphasecontrolunit,whichrotatesthemainbevelgearintheassembly.5.ControlvalveFeedshydraulicpressuretothesteeringactuator,accordingtothephaseandstrokerequiredforappropriaterearwheelsteering.6.Hydraulicpowercylin
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
最新文档
- 55Cr3钢稳定杆冷弯断裂原因分析
- 4G移动通信网络维护及管理技术
- 3-6岁幼儿责任行为发展的调查研究
- 3D打印技术在家具设计课程中的应用初探
- 300MW机组DEH操作员站改造
- 21世纪以来国际学界混合式学习研究的热点与前沿进展
- 2020年海洋气象研究热点回眸
- 1644-1949年陕北地区旱灾研究
- 1000MW二次再热机组取消电动给水泵可行性探讨
- 城市交通拥堵缓解策略成效分析
- 监理平行检查记录表格模板
- 食堂从业人员知识培训考核试题与答案
- 老旧管网改造工程施工方案与技术措施(完整版)
- 教师职业道德讲座(新教师培训).ppt
- 英语十六种时态表格(附准确例句)
- 语法ー言语の単位と品词の分类.ppt
- 我的家乡甘肃张掖.ppt
- IPC-1752文件详细填写规范
- 英语试卷讲评课完整ppt课件
- 各类阀门重量参考明细表
- 自备稿件--我的南方和北方.doc
评论
0/150
提交评论