机械毕业设计英文外文翻译363汽车防抱死制动系统ABS.docx

机械毕业设计英文外文翻译363汽车防抱死制动系统ABS.docx

《机械毕业设计英文外文翻译363汽车防抱死制动系统ABS.docx》由会员分享，可在线阅读，更多相关《机械毕业设计英文外文翻译363汽车防抱死制动系统ABS.docx（11页珍藏版）》请在冰豆网上搜索。

机械毕业设计英文外文翻译363汽车防抱死制动系统ABS

附录

附录1

Automobileanti-lockbrakingsystem（ABS）

Abstract:

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

Keyword:

Automobileanti-lockbrakingsystemcontroltechnology

1.outline

Alongwithautomobileindustry'srapiddevelopmentandhighway'sunceasingconstruction,automobile'stravelsecuritymoreandmoretakesseriouslyforthepeople.Tosatisfyincomprehensivelythebrakeprocesstheautomobiletothebrakerequest,causesthebrakebrakingforceassignmenttohastenreasonably.Theautomobileanti-lockbrakingsystem（i.e.ABS）moreandmorehasappliedontheautomobile.

“ABS”Chinesetranslatesis“againstdeadlocksthebrakesystem”.Itisonekindhastheskidprevention,againsttodeadlockandsoonmeritautosafetycontrolsystems.ABSisintheconventionbrakesystemfoundationadvancedversiontechnology,separablemechanicalandelectronicformulatwokinds.

Onthemodernautomobileinstallstheanti-lockbrakingsystemmassively,ABSbothhastheordinarybrakingsystem'sbrakefunction,andcouldpreventthewheeltodeadlock,enablestheautomobilestilltochangeunderthestopping,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,generallyexplainsinthebrakeprocesswithgliderateStoskidingredienthowmany.Thegliderateisbigger,theglideingredientareless.

And:

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

Longitudinalandthelateraladhesioncoefficientmayexpressforthewheelslipratefunction（e.g.Figure1）.ThemostgreatlylongitudinalcoefficientofadhesioncorrespondsthegliderateiscalledcriticalpointoffixitySK.GripsfastthepaceaccordingtothecontroltheoryissmallerthantheSKregioniscalledthestablebrakearea,whatSKlaterhascustom-madeunstablemovesthearea.ABSispreciselyusesbetweenthepathandtire'srelations,compulsorywheelslipratecontrolnearbycriticalpointoffixitySK,enablestheroadsurfaceadhesionpropertytoobtainthefullestdisplay,thusachievesthebestbrakeeffect.

Figure1coefficientofadhesion-glideratecurve

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

2.ControltechnologyusedbyABSnow

TheABScontroleffectisdecidedcontroltechnology[4]whichtoagreatextentusesinthesystem.Atpresentusesismainlythelogicalthresholdvaluecontroltechnology.TofurtherenhanceABStheperformance,butalsoproposedsomebasedontheglideratecontroltechnology,likethePIDcontrol,theglidemodalitychangethestructurecontrols,fuzzycontrolandsoon.Eachkindofcontrolapproachestheexpectationbythedifferentcontrolrulethespot.

2.1PIDcontrols

ThedefinitionexpectsgliderateS0anddifferenceoftheactualgliderateSforningerrore=S-S0,thenthePIDcontrolrulemayberepresentedas:

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

2.2Theglidemodalitychangesthestructurecontrol

Againstholdsthedeadbrakebytheautomobilethebasicprincipletobepossibletoknow,itsbrakeprocess'sessentialquestioniswheel'sglideratecontrolincoefficientofadhesionpeakpointSk,thentheglidemodalitychangedstructurebasissystemcondition,thedeviationandthederivativevaluethen,inthedifferentcontrolledarea,byperfectswitch'swayhand-offcontrolquantity'ssizeandthemark,theguaranteesystemintheglideregionverysmallscope,thestatepointlocus（S,×S）alongmovedthefestivalcurvetoslideslipperytothecontrolobjective（Sk,0）.usuallytakesthebrakingmomentforcontrolledvariableU,thecutconditionis:

AndMb-,Mb+representthebrakingmomentwhichdecidedbythegoverningsystemtoreduce,toincreasetwodifferentconditionsseparately.

Forthecutfunction,e=S-Skistheactualglideraterelativetargetpointdeviation.

2.3Fuzzycontrol

Regardingtakethegliderateascontrolledmember'santi-lockbrakingsystem,itsinputvaluetakestheexpectationgliderateandwheelactualglideratedeviationEaswellasdeviation'srateofchangeEC,theoutputforthebrakelineflowingtubingheadpressure.Usesthebeltmodificationfactorthefuzzycontroller,usesthecontrollistsummarywhichthefuzzyreasoningalgorithmformsisananalysisformula:

U=α×E+（1-α）EC

AndAlphaisthemodificationfactor,Alphathevaluesizehasreflecteddirectlytothedeviationandthedeviationrateofchangeweightingdegree.ThroughtheadjustmentmodificationfactorAlpha,maychangethecontrolrule.WhenAlphaisbig,indicatedthatisbigtodeviation'sweighting,thestepresponseisquick,thecontrolenergymainlyusesinreducingthedeviation,buteasytopresenttheovermodulation;WhenAlphaissmall,thecontrolgoalreducestheovermodulation,buttheresponseprocessisslow.UsuallyusesthebelttwoAlphavaluesthemodificationfactorexpressionstobeabletorequestonthesatisfiability,namely:

And,modificationfactorα1,α2∈（0,1）,andα1

2.4Logicalthresholdvaluecontrol

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

WheelskiddingrateS,thewheelrotatestheangleadds（reduces）thespeedOmegaandtherateofchange.ωandsoonthreekindofdescriptionwheelmovementsituationordynamicsconditionparameter.BecauseonlyusesacontrolledvariabledifficultywithtoguaranteethatABShasthegoodperformanceundereachkindoftravelcondition,therefore,thelogicalthresholdvaluecontrolmethodusuallyrotatesatpresentthewheeltheangleadds（reduces）thespeedtotaketheprimarycontrolparameter,buttakeswheel'sgliderateSthesecondarycontrolparameter.Andthegliderateisfromeachwheelfastsignalaftercertainlogicdeterminedautomobile'sreferencevelocity,calculatesthereferencegliderate,hasthedifferencewiththeactualgliderate.

2.5Doubleparametercontrol

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

Itsprincipleofworkisthevehiclespeedsensorandaroundfastsensor,separatelysignalinputthevehiclespeedandroundfastthecomputer,calculatestheactualslippingratebasedonthecomputer,and15%one20%doeswiththeidealslippingratecompares,fluctuatesbrake'sbrakingforceagainthroughthesolenoidvalve.thiskindtowsthefastsensorcommonlyusedDopplervelocityradar.Whentheautomobilegoes,theDopplerradarantennabycertainfrequencytotheearthlaunchingelectromagneticwave,simultaneouslyreceivestheelectromagneticwavewhichunceasinglyreflects,surveystheautomobileradarlaunchandthereceivedifferentialvalue,thenmaycalculatetheautomobilevehiclespeedaccurately.Butturnsthefastsensortoinstallinthetransmissiongearboxoutercovering,actuatesbythetransmissiongearboxoutputshaft,itisapulseelectricalmachinery,producesfrequencyandroundintensivedirectproportion.Theimplementingagencyandsooniscomposedofthesolenoidvalveandtherelay.Solenoidvalveadjustmentbrakingforce,withtheaimofmaintainingtheidealslippingrate.ThiskindofABSmayguaranteethattheslippingrateidealcontrol,againstholdsthebrakingqualitytobegood,butbecauseincreasedavelocityradar,thereforethestructureiscomplex,thecostisalsohigh.

2.6Singleparametercontrol

Ittakecontrolswheel'sangleretardedvelocityastheobject,controlswheel'sbrakingforce,realizesagainstholdsthedeadbrake,itsstructuremainlybyaroundfastsensor,thecontroller（comput