外文翻译汽车防抱死系统设计.docx

外文翻译汽车防抱死系统设计.docx

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外文翻译汽车防抱死系统设计

译文

原文题目：

Automobileanti-lockbrakingsystemdesign

译文题目：

汽车防抱死系统设计

学院：

机电工程学院

专业班级：

机械工程及自动化09级（3）班

学生姓名：

xxxxxxx

学号：

xxxxxxxxxxxx

Automobileanti-lockbrakingsystem（ABS）

Abstract

Thisarticleintroducedbrieflytheautomobileanti-lockbrakingsystem（Anti-lockBrakingSystem,iscalledABS）thecontrolprinciple,thecontroltechnologywhichusedinthepresentautomobileanti-lockbrakingsystemhascarriedonthesummaymandhascarriedontheforecasttoitstrendofdevelopment.

Keyword:

Automobileanti-lockbrakingsystemcontroltechnology

1.outline

Alongwithautomobileindustry'srapiddevelopmentandhighway'unceasingconstruction,automobile'travelsecuritymoreandmoretakesseriouslyforpeople.Tosatisfyincomprehensivelythebrakeprocesstheautomobiletothebrakerequest,causethebrakebrakingforceassignmenttohastenreasonably.Theautomobileanti-lockbrakingsystem（i.e.ABS）moreandmorehasappliedontheautomobile.

"ABS"Chinesetranslatesis"againstdeadlocksthebrakesystem".Itisonekindhastheskidprevention,againsttodeadlockandsoonmeritautosafetycontrolsystems.ABSisintheconventionbrakesystemfoundationadvancedversiontechnology,separablemechanicalandelectronicformulatwokinds.

Onthemodernautomobileinstallstheanti-lockbrakingsystemmassively,ABSbothhastheautomobilesilltochangeunderthestopping,guaranteedthatautomobile'sbrakeyawingstability,preventedtohavetheside-slippingandtorun,wasonthepresentautomobileismostadvanced,thebrakeeffectbestarrestinggear.

Theordinarybrakingsystemappliesthebrakeintheslipperyroadsurface,orinemergencybrake,becausethewheeliseasythebrakingforcetosurpassthetireandthegroundfrictionforcehugssafelydies.

Theautomobileanti-lockbrakingsystemisreferstotheautomobileinthebrakeprocesstobeablethereal-timedeterminationwheel'sgliderate,theautomaticcontrolfunctiononwheel'sbrakingmoment,preventsthewheeltohugdies.Thusobtainsthebestbrakepotencytheelectronicinstallation.Itcanwheel'sglideratecontrolincertainscope,usefullybetweenthetireandtheroadsurfaceadhesion,reducesthestoppingdistanceeffectively,obviouslyenhanceswhenthecarbrakingcontrollabilityandstability,wheneachkindoftrafficaccidentwhichhasavoidedthewheelhugsdieseasytoappear.Alongwithbrakeintensity'sincrease,thewheelrollingingredientaregettingfewerandfewer,butskidstheingredienttobegettingmoreandmore,generallyexpainsinthebrakeprocesswithgliderateStoskidingredienthowmany.Thegliderateisbigger,theglideingredientareless.

And:

u--wheelcenterspeed;r--doesnothavetimethegroundbrakingforcewheelrollingradius;w--wheel'sangularspeed.

LongitudinalandthelateraladhesioncoefficientmayexpressforthewheelsliprateiscalledcriticalpointoffixitySK.GripsfastthepaceaccordingtothecontroltheoryissmallerthantheSKregioniscalledthestablebrakearea,whaSKlaterhascustom-madeunstablemovesthearea.ABSispreciselyusesbetweenthepathandtire'srelations,compulsorywheelslidpatecontrolnearbycriticalpointofficitySK,enablesthetoadsurfaceadhesionpropertytobotainthefullestdisplay,thusachievesthebestbrakeeffect.

Figure1coeffientofadhesion-glideratecurve

AtpresentusesABSmainlybyaroundfastsensor,theelectroniccontrolunit,appendicesandsoonpressurecontrolvalveandgroupoflines,pipelineiscomposed.TheABSdevelopmentismainlystudiesthedesignoptimizationoperationandthecontrolproceduresoftware,realizesthereal-timepresisebrakeadjustmenttechnology,simultaneouslyraiseshardware'slevel.

2.ConrtoltechnologyusedbyABSnow

TheABScontroleffectisdecidedcontroltechnology[4]whichtoagreatextentusesinthesystem.Atpresentusesismainlythelogicalthresholdvaluecontroltechnology.TofurtherenhanceABStheperformance,butalsoproposedsomebasedontheglidetatecontroltechnology,likethePIDcontrol,theglidemodalitychangethesrtucturecontrols,fuzzycontrolandsoon.Eachkindofcontrolapproachestheexpectationbythedifferentcontrolrulethespot.

2.1PIDcontrols

ThedefinitionexpectsgliderateS0anddifferenceoftheactualgliderateSfore=S-S0,thenthePIDcontrolrulemayberepresentedas:

Therefore,theABScontroller'sdesignsumsupfinallyas,accordingtotheABSdynamicsystem,determinedgroupofbestarameterKp,KiandKd,enablewheel'sglideratetoapproachhypothesisgoalS0bythequickestway.

2.2Theglidemodalitychangesthestructurecontrol

Againstholdsthedeadbrakebytheautomobilebasicprincipletobepossibletoknow,itsbrakeprocess'sessentialquestioniswheel'sglidetatecontrolincoefficientofadhesionpeakpointSK,thentheglidemodalitychangedstructurebasissystemcondition,thedeviationandthederivativevaluethen,inthedifferentcontrolledarea,byperfectswitch'wayhand-offcontrolquantity'ssizeandthemark,theguaranteesystemintheglideregionverysmallscope,thestatepointlocus（S,*S）alongmovedthefestivalcurvetoslideslipperytothecontrolobjective（SK,0）.

UsuallytakesthebrakingmomentforcontrolledvariableU,thecutconditionis:

AndMb-,Mb+representthebrakingmomentwhichdecidedbythegoverningsystemtoreduce,toincreasetwodifferentconditionsseparately.

Forthecutfunction,e=S-Skistheactualglideratetelativetargetpointdevivation.

2.3Fuzzycontrol

Regardingtaketheglidetareascontrolledmember'santi-lockbrakingsystem,itsinputvaluetakestheexpecatationgliderateandwheelactualglidetatedeviationEaswellasdeviation'srateofchangeEC,theoutputforthebrakelineflowingtubingheadpressure.Usesthebeltmodificationfactorthefuzzycontroller,usesthecontrollistsummarywhichthefuzzyreasoningalgorithmformsisananalysisformula:

AndAlphaisthemodificationfactor,Alphathevaluesizehasreflecteddirectlytothedeviationandthedebiationrateofchangeweightingdegree.ThroughtheadjustmentmodificationfactorAlpha,maychangethecontrolrule.WhenAlphaisbig,indicatedthatisbigtodeviation'sweighting,thestepresponseisquick,thecontrolenergymainlyusesinreducingthedeviation,buteasytopresenttheovermodulation;WhenAlpjaissmall,thecontrolgoalreducestheovermodulation,buttheresponseprocessisslow.UsuallyusesthebelttwoAlphavaluesthemodificationfactorexptessionstobeabletorequestonthesatisfiability,namely:

u=αXE+（1-α）EC

And,modificationfactorα1,α2in（0,1）.

2.4Logicalthresholdvaluecontrol

Thismethodestablishessomecontrollimitadvancetocertaincontrolledvariable（threshold）thevalue,whenappliesthebrake,accordingtothecomputationreal-timeparametervalueandthecorrespondingthresholdvalue'ssizerelations,determineswheel'sstateofmotion,thusthecontroladjustmentbrakepressure,gainsenoughbigbrakeintensityandthegoodyawingstability.OftenincludesastheABScontrolledvariable:

WheelskiddingrateS,thewheelrotatestheangleadds（reduces）thespeedOmegaandtherateofchange.ωandsoonthreekindofdescrimtionwheelmovementsituationordanamicsconditionparameter.BecauseonlyusesacontrolledvariabledifficultywithtoguaranteethatABShasthegoodperformanceundereachkindoftravelcondition,therefore,thelogicalthresholdvaluecontrolmethodrotatesatpresentthewheeltheangleadds（reduce）thespeedtotaketheprimarycontrolparameter,buttakeswheel'sglidetateSthesecondarycontrolparameter.Andthegliderateisfromeachwheelfastsignalaftercertainlogicdeterminedautomobile'svelocity,calculatesthereferencegliderate,hasthedifferencewiththeactualgliderate.

2.5Doubleparametercontrol

Doubleparametercontrol'sABS,bythevehiclespeedsensor（velocityradar）,aroundfastsensor,thecontroldevice（computer）andtheimplementingagencyiscomposed.

Itsprincipleofworkisthevehiclespeedsensorandaroundfastsensor,separatelysingalinputthevehiclespeedandroundfastthecomputer,calculatestheactualslippingratebasedonthecomputer,and15%one20%?

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dosewiththeidealslippingtatecompares,fluctuatesbrake'sbrakingforceagainthroughthesolenoidvalve.ThiskindtowsthefastsensorcommonlyusedDopplervelocityradar.WhentheautomobilegoestheDopplerradarantennabycertainfrequencytotheearthlaunchingelectromagneticwave,simultaneouslyreceivestheelectromagneticwavewhichunceasinglyreflects,surveystheautomobileradarlanchandthereceivedifferentialvalue,thenmaycalculatetheautomobilevehiclespeedaccurately.Butturnsthefastsensortoinstallinthetransmissiongearboxoutercovering,acuatesbythetransmissiongearboxoutputshaft,itisapulseelectricalmachinery,procucesfrequencyandroundintensivedirectproportion.Theimpiementingagencyandsooniscomposedofthesolenoidvalveandtherelay.Solenoidvalveadjustmentbrakingforve,withtheaimofmaintainingtheidealslippingrate.ThiskindofABSmayguaranteethattheslippingrateidealcontrol,againstholdsthebrakingqualitytobegood,butbecauseincreasedavelocityradar,therethestructureiscomplex,thecostisalsohigh.

2.6Singleparametercontrol

Ittakecontrolswheel'sangletetardedvelocityastheobject,controlswheel'sbrakingforce,realizesagainstholdsthedeadbrake,itsstructuremainlybyaroundfastsensor,thecontroller（computer）andthesolenoidvalveiscomposed.Foraccuratemeterwheelfast,thesensingandbetweenthewheeltoothringshouldleaveleewaythe1mmgap.Inordertoavoidthewater,theputty,thedusttothesensorinfluence,beforetheinstallment,shouldthesensorreplenishmentbutter