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.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
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