会员注册 | 登录 | 微信快捷登录 支付宝快捷登录 QQ登录 微博登录 | 帮助中心 人人文库renrendoc.com美如初恋!
站内搜索 百度文库

热门搜索: 直缝焊接机 矿井提升机 循环球式转向器图纸 机器人手爪发展史 管道机器人dwg 动平衡试验台设计

   首页 人人文库网 > 资源分类 > DOC文档下载

外文翻译--汽车的转向控制.doc

  • 资源星级:
  • 资源大小:56.00KB   全文页数:12页
  • 资源格式: DOC        下载权限:注册会员/VIP会员
您还没有登陆,请先登录。登陆后即可下载此文档。
  合作网站登录: 微信快捷登录 支付宝快捷登录   QQ登录   微博登录
友情提示
2:本站资源不支持迅雷下载,请使用浏览器直接下载(不支持QQ浏览器)
3:本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰   

外文翻译--汽车的转向控制.doc

附录英文翻译Spincontrolforcars.Stabilitycontrolsystemsarethelatestinastringoftechnologiesfocusingonimproveddirivingsafety.Suchsystemsdetecttheinitialphasesofaskidandrestoredirectionalcontrolin40milliseconds,seventimesfastertthanthereactiontimeoftheaveragehuman.Theycorrectvehiclepathsbyadjustingenginetorqueorapplyingtheleftorrightsidebrakes,orboth,asneeded.ThetechnologyhasalreadybeenappliedtotheMercedesBenzS600coupe.FullTextCOPYRIGHT1995AmericanSocietyofMechanicalEngineersAutomaticstabilitysystemscandetecttheonsetofaskidandbringafishtailingvehiclebackoncourseevenbeforeitsdrivercanreact.Safetyglass,seatbelts,crumplezones,airbags,antilockbrakes,tractioncontrol,andnowstabilitycontrol.Thecontinuingprogressionofsafetysystemsforcarshasyieldedyetanotherdevicedesignedtokeepoccupantsfrominjury.Stabilitycontrolsystemshelpdriversrecoverfromuncontrolledskidsincurves,thusavoidingspinoutsandaccidents.Usingcomputersandanarrayofsensors,astabilitycontrolsystemdetectstheonsetofaskidandrestoresdirectionalcontrolmorequicklythanahumandrivercan.Everymicrosecond,thesystemtakesasnapshot,calculatingwhetheracarisgoingexactlyinthedirectionitisbeingsteered.Ifthereistheslightestdifferencebetweenwherethedriverissteeringandwherethevehicleisgoing,thesystemcorrectsitspathinasplitsecondbyadjustingenginetorqueand/orapplyingthecatsleftorrightsidebrakesasneeded.Typicalreactiontimeis40millisecondsseventimesfasterthanthatoftheaveragehuman.Astabilitycontrolsystemsensesthedriversdesiredmotionfromthesteeringangle,theacceleratorpedalposition,andthebrakepressurewhiledeterminingthevehiclesactualmotionfromtheyawratevehiclerotationaboutitsverticalaxisandlateralacceleration,explainedAntonvanZanten,projectleaderoftheRobertBoschengineeringteam.VanZantensgroupandateamofengineersfromMercedesBenz,ledbyprojectmanagerArminMuller,developedthefirstfullyeffectivestabilitycontrolsystem,whichregulatesenginetorqueandwheelbrakepressuresusingtractioncontrolcomponentstominimizethedifferencebetweenthedesiredandactualmotion.Automotivesafetyexpertsbelievethatstabilitycontrolsystemswillreducethenumberofaccidents,oratleasttheseverityofdamage.Safetystatisticssaythatmostofthedeadlyaccidentsinwhichasinglecarspinsoutaccountingforfourpercentofalldeadlycollisionscouldbeavoidedusingthenewtechnology.Theadditionalcostofthenewsystemsareontheorderoftheincreasinglypopularantilockbrake/tractioncontrolunitsnowavailableforcars.ThedebutofstabilitycontroltechnologytookplaceinEuropeontheMercedesBenzS600coupethisspring.DevelopedjointlyduringthepastfewyearsbyRobertBoschGmbHandMercedesBenzAG,bothofStuttgart,Germany,VehicleDynamicsControlVDC.inBoschterminology,ortheElectronicStabilityProgramESP,asMercedescallsit,maintainsvehiclestabilityinmostdrivingsituations.Boschdevelopedthesystem,andMercedesBenzintegrateditintothevehicle.MercedesengineersusedthestateoftheartDaimlerBenzvirtualrealitydrivingsimulatorinBerlintoevaluatethesystemunderextremeconditions,suchasstrongcrosswinds.TheythenputthesystemthroughitspacesontheslickiceofLakeHornavannearArjeplog,Sweden.Workiscurrentlyunderwaytoadaptthetechnologytobusesandlargetrucks,toavoidjackknifing,forexample.Stabilitycontrolsystemswillfirstappearinmid1995onsomeEuropeanSClassmodelsandwillreachtheU.S.marketduringthe1996modelyearNovember1995introduction.Itwillbeavailableasa750optiononMercedesmodelswithV8engines,andthefollowingyearitwillbea2400optiononsixcylindercars.About1650ofthelatterpriceisforthetractioncontrolsystem,aprerequisiteforstabilitycontrol.Boschisnotaloneindevelopingsuchasafetysystem.ITTAutomotiveofAuburnHills,Mich.,introduceditsAutomotiveStabilityManagementSystemASMSinJanuaryatthe1995NorthAmericanInternationalAutoShowinDetroit.ASMSisaquantumleapintheevolutionofantilockbrakesystems,combiningthebestattributesofABSandtractioncontrolintoatotalvehicledynamicsmanagementsystem,saidTimothyD.Leuliette,ITTAutomotivespresidentandchiefexecutiveofficer.ASMSmonitorswhatthevehiclecontrolsindicateshouldbehappening,comparesthattowhatisactuallyhappening,thenworkstocompensateforthedifference,saidJohannesGraber,ASMSprogrammanageratITTAutomotiveEurope.ITTssystemshouldbeginappearingonvehiclesworldwideneartheendofthedecade,accordingtoTomMathues,directorofengineeringofBrakeChassisSystemsatITTAutomotiveNorthAmerica.Companyengineersarenowadaptingthesystemtospecificcarmodelsfromsixoriginalequipmentmanufacturers.AlesssophisticatedandlesseffectiveBoschstabilitycontrolsystemalreadyappearsonthe1995750iLand850CiV12modelsfromMunichbasedBMWAG.TheBMWDynamicStabilityControlDSCsystemusesthesamewheelspeedsensorsastractioncontrolandstandardantilockbrakeABSsystemstorecognizeconditionsthatcandestabilizeavehicleincurvesandcorners.Todetectsuchpotentiallydangerouscorneringsituations,DSCmeasuresdifferencesinrotationalspeedbetweenthetwofrontwheels.TheDSCsystemalsoaddsasensorforsteeringangle,Utilizesanexistingoneforvehiclevelocity,andintroducesitsownsoftwarecontrolelementsintheoverallantilockbrake/tractioncontrol/stabilitycontrolsystem.ThenewBoschandITTAutomotivestabilitycontrolsystemsbenefitfromadvancedtechnologydevelopedfortheaerospaceindustry.Justasinasupersonicfighter,theautomotivestabilitycontrolunitsuseasensorbasedcomputersystemtomediatebetweenthehumancontrollerandtheenvironmentinthiscase,theinterfacebetweentireandroad.Inaddition,thesystemisbuiltaroundagyroscopelikesensordesignusedformissileguidance.BEYONDABSANDTRACTIONCONTROLStabilitycontrolisthelogicalextensionofABSandtractioncontrol,accordingtoaSocietyofAutomotiveEngineerspaperwrittenbyvanZantenandBoschcolleaguesRainerErhardtandGeorgPfaff.WhereasABSinterveneswhenwheellockisimminentduringbraking,andtractioncontrolpreventswheelslippagewhenaccelerating,stabilitycontroloperatesindependentlyofthedriversactionsevenwhenthecarisfreerolling.Dependingontheparticulardrivingsituation,thesystemmayactivateanindividualwheelbrakeoranycombinationofthefourandadjustenginetorque,stabilizingthecarandseverelyreducingthedangerofanuncontrolledskid.Thenewsystemscontrolthemotionnotonlyduringfullbrakingbutalsoduringpartialbraking,coasting,acceleration,andenginedragonthedrivenwheels,circumstanceswellbeyondwhatABSandtractioncontrolcanhandle.TheideabehindthethreeactivesafetysystemsisthesameOnewheellockingorslippingsignificantlydecreasesdirectionalstabilityormakessteeringavehiclemoredifficult.Ifacarmustbrakeonalowfrictionsurface,lockingitswheelsshouldbeavoidedtomaintainstabilityandsteerability.WhereasABSandtractioncontrolpreventundesiredlongitudinalslip,stabilitycontrolreduceslossoflateralstability.Ifthelateralforcesofamovingvehiclearenolongeradequateatoneormorewheels,thevehiclemaylosestability,particularlyincurves.Whatthedriversensesasfishtailingisprimarilyaturningorspinningaroundthevehiclesaxis.Aseparatesensormustrecognizethisspinning,becauseunlikeABSandtractioncontrol,acarslateralmovementcannotbecalculatedfromitswheelspeeds.SPINHANDLERSThenewsystemsmeasureanytendencytowardundersteerwhenacarrespondsslowlytosteeringchanges,oroversteerwhentherearwheelstrytoswingaround.Ifacarundersteersandswervesoffcoursewhendriveninacurve,thestabilitycontrolsystemwillcorrecttheerrorbybrakingtheinnerwithrespecttothecurverearwheel.Thisenablesthedriver,asinthecaseofABS,toapproachthelockinglimitoftheroadtireinterfacewithoutlosingcontrolofthevehicle.Thestabilitycontrolsystemmayreducethevehiclesdrivemomentumbythrottlingbacktheengineand/orbybrakingonindividualwheels.Conversely,ifthehteralstabilizingforceontherearaxleisinsufficient,thedangerofoversteeringmayresultinrearendbreakawayorspinout.Here,thesystemactsasastabilizerbyapplyingtheouterfrontwheelbrake.Theinfluenceofsideslipangleonmaneuverability,theBoschresearchersexplained,showsthatthesensitivityoftheyawmomentonthevehicle,withrespecttochangesinthesteeringangle,decreasesrapidlyastheslipangleofthevehicleincreases.Oncetheslipanglegrowsbeyondacertainlimit,thedriverhasamuchhardertimerecoveringbysteering.Ondrysurfaces,maneuverabilityislostatslipanglevalueslargerthanapproximately10degrees,andonpackedsnowatapproximately4degrees.Mostdrivershavelittleexperiencerecoveringfromskids.Theyarentawareofthecoefficientoffrictionbetweenthetiresandtheroadandhavenoideaoftheirvehicleslateralstabilitymargin.Whenthelimitofadhesionisreached,thedriverisusuallycaughtbysurpriseandveryoftenreactsinthewrongway,steeringtoomuch.Oversteering,ITTsGraberexplained,causesthecartofishtail,throwingthevehicleevenfurtheroutofcontrol.ASMSsensors,hesaid,canquicklydetectthebeginningofaskidandmomentarilyactivatethebrakesatindividualwheelstohelpreturnthevehicletoastableline.Itisimportantthatstabilitycontrolsystemsbeuserfriendlyatthelimitofadhesionthatis,toactpredictablyinawaysimilartonormaldriving.

注意事项

本文(外文翻译--汽车的转向控制.doc)为本站会员(英文资料库)主动上传,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,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网([email protected]),我们立即给予删除!

温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。

copyright@ 2015-2017 人人文库网网站版权所有
苏ICP备12009002号-5