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毕业设计--汽车防抱死系统相关文献翻译

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毕业设计--汽车防抱死系统相关文献翻译

防抱死制动系统防抱死制动系统ABS全称是AntilockBrakingSystem,即ABS,可安装在任何带液压刹车的汽车上。它是利用阀体内的一个橡胶气囊,在踩下刹车时,给予刹车油压力,充斥到ABS的阀体中,此时气囊利用中间的空气隔层将压力返回,使车轮避过锁死点。简介ABS(AntilockBrakingSystem)防抱死制动系统,通过安装在车轮上的传感器发出车轮将被抱死的信号,控制器指令调节器降低该车轮制动缸的油压,减小制动力矩,经一定时间后,再恢复原有的油压,不断的这样循环(每秒可达510次),始终使车轮处于转动状态而又有最大的制动力矩。没有安装ABS的汽车,在行驶中如果用力踩下制动踏板,车轮转速会急速降低,当制动力超过车轮与地面的摩擦力时,车轮就会被抱死,完全抱死的车轮会使轮胎与地面的摩擦力下降,如果前轮被抱死,驾驶员就无法控制车辆的行驶方向,如果后轮被抱死,就极容易出现侧滑现象。提示在遇到紧急情况时,制动踏板一定要踩到底,才能激活ABS系统,这时制动踏板会有一些抖动,有时还会有一些声音,但也不能松开,这表明ABS系统开始起作用了。分类一是按生产厂家分类,二是按控制通道分类。以下主要介绍按通道分类的方法。在ABS中,对能够独立进行制动压力调节的制动管路称为控制通道。ABS装置的控制通道分为四通道式、三通道式、二通道式和一通道式。1四通道式四通道ABS有四个轮速传感器,在通往四个车轮制动分泵的管路中,各设一个制动压力调节器装置,进行独立控制,构成四通道控制形式。但是如果汽车左右两个车轮的附着系数相差较大如路面部分积水或结冰,制动时两个车轮的地面制动力就相差较大,因此会产生横摆力矩,使车身向制动力较大的一侧跑偏,不能保持汽车按预定方向行驶,会影响汽车的制动方向稳定性。因此,驾驶员在部分结冰或积水等湿滑的路面行车时,应降低车速,不可盲目迷信ABS装置。2三通道式三通道ABS是对两前轮进行独立控制,两后轮按低选原则进行一同控制即两个车轮由一个通道控制,以保证附着力较小的车轮不抱死为原则,也称混合控制。桑塔纳2000GSi既是用的这种ABS装置。性能特点两后轮按低选原则进行一同控制时,可以保证汽车在各种条件下左右两后轮的制动力相等,即使两侧车轮的附着系数相差较大,两个车轮的制动力都限制在附着力较小的水平,使两个后轮的制动力始终保持平衡,保证汽车在各种条件下制动时都具有良好的方向稳定性。在对桑塔纳2000进行的60km/h紧急制动对比试验中,有ABS的车型比无ABS车型的制动距离只短1米,但是有ABS的车型始终都有方向,不会失去对方向的控制。对两前轮进行独立控制,主要考虑小轿车,特别是前轮驱动的汽车,前轮的制动力在汽车总制动中所占的比例较大可达70左右,可以充分利用两前轮的附着力。但由于两前轮制动力不平衡对汽车行驶方向稳定性影响相对较小,而且可以通过驾驶员的转向操纵对由此产生的影响进行修正。因此,三通道ABS在小轿车上被普遍采用。3二通道式二通道式ABS难以在方向稳定性、转向控制性和制动效能各方面得到兼顾,目前采用很少。4一通道式一通道式ABS常叫单通道ABS,它是在后轮制动器总管中设置一个制动压力调节器,在后桥主减速器上安装一个轮速传感器也有在后轮上各安装一个。性能特点单通道ABS一般都是对两后轮按低选原则进行一同控制。单通道ABS不能使两后轮的附着力得到充分利用,因此制动距离不一定会明显缩短。另外前轮制动未进行控制,制动时前轮仍会出现制动抱死,因而转向操纵能力也未得到改善,但由于制动时两后轮不会抱死,能够显著的提高制动时的方向稳定性,在安全上是一大优点,同时结构简单,成本低等优点,所以在轻型载货车上广泛应用。综上所述,ABS装置虽然具有缩短制动距离、另外,不同类型的ABS装置由于组成结构等原因,价格也相差较大,所以选购汽车时不能只看到价格高低,还应看到装用的是那种类型的ABS装置。优点当车轮即将到达下一个锁死点时,刹车油的压力使得气囊重复作用,如此在一秒钟内可作用60120次,相当于不停地刹车、放松,即相似于机械的点刹。因此,ABS防抱死系统,能避免在紧急刹车时方向失控及车轮侧滑,使车轮在刹车时不被锁死,不让轮胎在一个点上与地面摩擦,从而加大摩擦力,使刹车效率达到90以上,同时还能减少刹车消耗,延长刹车轮鼓、碟片和轮胎两倍的使用寿命。装有ABS的车辆在干柏油路、雨天、雪天等路面防滑性能分别达到8090、1030、1520。局限性ABS系统本身也有局限性,它仍然摆脱不了一定的物理规律。在两种情况下,ABS系统不能提供最短的制动距离。一种是在平滑的干路上,由有经验的驾驶员直接进行制动。另一种情况是在松散的砾石路面、松土路面或积雪很深的路面上制动另外,通常在干路面上,最新的ABS系统能将滑移率控制在520的范围内,但并不是所有的ABS都以相同的速率或相同的程度来进行制动。尽管四轮防抱制动系统能使汽车在尽可能短的距离内进行制动,但如果制动进行得太迟,使之在与障碍物碰撞前不能完全停下来,仍不能阻止事故的发生。工作原理制动总泵制动踏板电动机储液罐ABS控制单元制动分泵轮速传感器车轮在制动时,ABS根据每个车轮速度传感器传来的速度信号,可迅速判断出车轮的抱死状态,关闭开始抱死车轮上面的常开输入电磁阀,让制动力不变,如果车轮继续抱死,则打开常闭输出电磁阀,这个车轮上的制动压力由于出现直通制动液贮油箱的管路而迅速下移,防止了因制动力过大而将车轮完全抱死。在让制动状态始终处于最佳点(滑移率S为20),制动效果达到最好,行车最安全。防抱死制动系统在制动总泵前面腔内的制动液是动态压力制动液,它推动反应套筒向右移动,反应套筒又推动助力活塞从而使制动踏板推杆向右移。因此,在ABS工作地时候,驾驶员可以感觉到脚上踏板地颤动,听到一些噪音。汽车减速后,一旦ABS电脑检测到车轮抱死状态消失,它就会让主控制阀关闭,从而使系统转入普通的制动状态下进行工作。如果蓄压器的压力下降到安全极限以下,红色制动故障指示灯和琥珀色ABS故障指示灯亮。在这种情况下,驾驶员要用较大的力进行深踩踏板式的制动方式才能对前后轮进行有效的制动。工作过程在ABS中,每个车轮上各安置一个转速传感器,将关于各车轮转速的信号输入电子控制装置。电子控制装置根据各车轮转传感器输入的信号对各个车轮的运动状态进行监测和判定并形成相应的控制指令。各处液压电磁阀均不通电而处于关闭状态,电动泵也不通电运转,制动主缸至各制动轮缸的制动管路均处于沟通状态,而各制动轮缸至储液器的制动管路均处于封闭状态,各制动轮缸的制动压力将随制动主缸的输出压力而变化,此时的制动过程与常规制动系统的制动过程完全相同。在制动过程中,电子控制装置根据车轮转速传感器输入的车轮转速信号判定有车轮趋于抱死时,ABS就进入防抱死制动压力调节过程。例如,电子控制装置判定右前轮趋于抱死时,电子控制装置就使控制右前轮制动压力的进液电磁阀通电,使右前进液电磁阀转入关闭状态,制动主缸输出的制动液不再进入右前制动轮缸,电子控制装置就使右前进液电磁阀和出液电磁阀都断电,使进液电磁阀转入开启状态,使出液电磁阀转入关闭状态,同时也使电动泵通电运转,向制动轮缸送制动液,由制动主缸输出的制动液和电动泵泵送的制动液都经过处于开启状态的右前进液电磁阀进入右前制动轮缸,使右前制动轮缸的制动压力迅速增大,右前轮又开始减速转动。ABS通过使趋于抱死车轮的制动压力循环往复地经历保持减小增大过程,而将趋于抱死车轮的滑动率控制在峰值附着系数滑动率的附近范围内,在该ABS中对应于每一个制动轮缸各有一对进液和出液电磁阀,可由电子控制装置分别进行控制,因此,各制动轮缸的制动压力能够被独立地调节,从而使四个车轮都不发生制动抱死现象。尽管各种ABS的结构形式和工作过程并不完全相同,但都是通过对趋于抱死车轮的制动压力进行自适应循环调节,来防止被控制车轮发生制动抱死的,而且,各种ABS在以下几个方面都是相同的。(1)ABS只是汽车的速度超过一定以后(如5km/h或8km/h),才会对制动过程中趋于抱死的车轮进行防抱死制动压力调节。当汽车速度被制动降低到一定时,ABS就会自动中止防抱死制动压力调节,此后,装备ABS汽车的制动过程将与常规制动系统的制动过程相同,车轮被制动抱死对汽车制动抱死。这是因为在汽车的速度很低时,车轮被制动抱死对汽车制动性能的影响已经很小,而且要使汽车尽快制动停车,应必须使车轮制动抱死。(2)在制动过程中,只有当被控制车轮趋于抱死时,ABS才会对趋于抱死车轮的制动压力进行防抱死调节在被控制车轮还没有趋于抱死时,制动过程与常规制动系统的制动过程完全相同。(3)ABS都具有自诊断功能,能够对系统的工作情况进行监测,一旦发现存在影响系统正常工作的故障时将自动地关闭ABS,并将ABS警示灯点亮,向驾驶员发出警示信号,汽车的制动系统仍然可以像常规制动系统一样进行制动。故障检修ABS检修注意事项ABS与普通制动系统是不可分的,普通制动系统一旦出现问题,ABS就不能正常工作,因此,要将二者视为整体进行维修。ABS电控单元对过电压、静电非常敏感,如有不慎就会损坏电控单元中的芯片,造成ABS失效。因此,点火精工关接通过时不要插或拔电控单元上的连接器在车上进行电焊之前,要戴好防静电器(也可用导线一头缠在车体上),拔下电单元上的连接器后再进行电焊给蓄电池进行专门充电时,要将蓄电池从车上拆下蓄电池电缆后再进行充电。维修转带传感器时要十分小心,拆卸时注意不要碰伤传感器头,不要将传感器齿圈当撬面,以免损坏。安装时应先涂覆防锈油,安装过程中不可调敲击或作蛮力。一般情况下,传感器气隙是可调的(也有不可调的),调整时应用无磁性塞尺(如塑料或铜塞尺),当然也可以用纸片。维修ABS液压控制装置时,切记要先泄压,再按规定进行修理,以免高压油喷出伤人。制动液至少每隔两年更换一次,最好是每年更换一次。这是因为DOT3乙二醇制动液的吸湿性很强,含水分的制动液不仅使制动系统内部产生腐蚀,而且会使制动效果明显下降,影响ABS的正常工作。注意不要使用DOT5硅酮制动液,更换和存储的制动液及器皿要清洁,不要让污物、灰尘进入液压系统。制动液不要沾到ABS电控单元和导线上。最后,要按规定的方式进行放气(与普通制动系统的放气有所不同)。在进行ABS诊断与检查时,只要掌握检测仪器等专用工作的使用方法,按照维修手册中给的故障诊断图表诊断即可,可不拘泥于检查形式和步骤,目的是准确判断故障点。更换ABS零部件时,一定要选用该车型高质量正品配件,以确保ABS维修后能正常工作。ABS故障类别及处理方法ABS故障基本上可分为电路故障、机械故障及外来干扰等三大类。电路故障。接通电源,ABS指示灯应亮,而一旦车速达到10km/h时,指示灯应自动熄灭,否则说明ABS有故障。ABS压力调节器均使用电磁阀,电压过高可能使其烧坏,电压过低使其不能正常工作。一般电源电压不可超过电磁阀额定电压的±15,对电控单元也存在上述同样的问题,否则ABS会误动作。脉冲环。脉冲环为一个铁质齿圈,起改变传感器磁场的作用。它固定在轮毂上,不与任何零部件接触。对此,有人不了解,误以为脉冲起齿轮的传动作用,而给其加润滑油或润滑剂,这样铁屑等杂物在其上积存,杂质积存过多,必然破坏传感器的灵敏度。脉冲环与轮毂不同轴,传感器与脉冲环的间隙是变化的,会影响其车轮运动的测试精度。造成这种情况的原因大致有安装脉冲环方法不当,脉冲环变形(保修车辆时对脉冲环造成不必要的冲击)、车轮轴承磨损松动等。脉冲环破损,也会影响测试四轮运动状态参数的准确性。遇上述情况,需要换脉冲环时,应重新确定传感器与脉冲环问题(0.20.5mm)。压力调节器,ABS电路良好,传感器能准确测量车轮运动状态。而ABS性能不良,如制动距离增长、防抱死抽动作用失控等,则为压力调节器故障所致。压力调节器的轻微故障是响应迟缓、增益不当,严重故障是工作不受ABS控制,脱开ABS不能恢复到常用的制动功能。AntilockbrakingsystemABSantilockBrakingSystemfullnameisAntilockstyleSystem,namelytheABS,canbeinstalledinanycarwithhydraulicbrake.Itistousethebodyofarubberballoon,whenputonthebrakes,brakeoilpressure,fillinthebodyofABS,airbaguseatthistimeinthemiddleoftheairinterlayerpressureback,evadedthewheellock.IntroductiontotheABSAntilockstyleSystem,antilockBrakingSystem,bymountedonthewheelsensorsignalthatthewheelswillbelock,thecontrollercommandtheoilpressureregulatortoreducethewheelbrakecylinder,decreasetheBrakingmoment,afteracertainperiodoftime,torestoretheoriginalhydraulic,constantlysuchcyclespersecondupto510times,alwaysinastateofrotationandthewheelhasthelargestBrakingtorque.NotinstalledABScar,ontheroadifhardonthebrakepedal,thewheelspeedwilldeclinedramatically,whenbrakingmorethanwheelfrictionwiththeground,thewheelswillbelock,lockthewheelswillbecompletelybringdownthetirefrictionwiththeground,ifthefrontwheellock,thedrivercouldnotcontrolthevehiclesdrivingdirection,iftherearwheellock,isextremelyeasytoappearsideslipphenomenon.Noteincaseofemergency,thebrakepedalmuststepontotheend,toactivatetheABSsystem,thebrakepedalwillhavesomejitter,sometimestherewillbesomesound,butalsocantloosen,thisshowsthattheABSsystembegantowork.ClassificationItisclassifiedbythemanufacturer,2areclassifiedaccordingtothecontrolchannel.Thefollowingmainlyintroducesthemethodofclassificationaccordingtothepassage.IntheABSbrakepressureregulationofindependentlybrakelineknownasthecontrolchannel.ABSdeviceofcontrolchannelisdividedintofourleading,threesingle,twoleadingandonesingle.1thefourleadingFourchannelABShasfourwheelspeedsensor,onthelinetofourwheelbrakecylinder,eachsetabrakingpressureregulatordevice,anindependentcontrol,constituteafourchannelcontrolform.Butifthecararoundthetwowheelsoftheadhesioncoefficientislargee.g.,roadsurfacewaterorice,brakewhenthetwowheelsofthegroundbrakingforceiscomparativelylargedifference,sowillproduceyawingmoment,makethebodytothebrakingforceisbiggerononesideofthewandering,cantkeepthecarwasgoingatpredetermineddirection,willaffecttheautomobilebrakingdirectionstability.Therefore,thedriverinthepartialfreezing,orwaterwetroaddriving,shouldreducethespeedofthecar,notblindlysuperstitionABSdevice.2thethreeleadingthreechannelABSisanindependentcontroloftwofrontwheels,tworearwheelsaccordingtotheprincipleoflowchoosetogethercontrolnamelythetwowheelsiscontrolledbyachannel,toensureadhesionofthesmallerwheelsdonotlockfortheprinciple,alsocalledhybridcontrol.Santana2000gsiiswiththeABSdevice.Principleofperformancecharacteristicschoosetworearwheelsaccordingtothelowcontroltogether,canensurethevehicleundervariousconditionsaroundtworearwheelbrakingforceisequal,evenifthewheelsonbothsidesofadhesioncoefficientislarge,andthetwowheelsofbrakingadhesionlimitinsmallerlevel,makethetworearwheelbrakingforcebalanceallthetime,ensurethevehicleundervariousconditionswithgooddirectionalstabilitywhenbraking.60km/honsantana2000emergencybrakingcontrastexperiment,withoutABSmodelshaveABSmodelsthanshortbrakingdistanceisonly1meter,butthereareABSmodelsalwayshaveadirection,notlosecontrolofthedirection.anindependentcontroloftwofrontwheels,mainconsiderationcar,especiallythefrontwheeldrivecar,thefrontwheelbrakingforceincarbrakeandtheproportionofthetotallargeupto70,canmakefulluseofthetwofrontwheeladhesion.Butbecausethetwofrontwheelbrakingforcebalanceeffectonthestabilityofthecarmovingdirectionisrelativelysmall,andcanpassthedriverssteeringaffectstheresultingcorrection.Therefore,threechannelABSisextensivelyusedincars.3thetwoleadingTwoleadingABSindirectionalstability,steeringcontrolandbrakingperformanceinallaspectstogettotwoormorethings,currentlyUSESverylittle.4asingleasingleABSisoftencalledthesinglechannelABS,itisintherearwheelbrakemainsetabrakingpressureregulator,therearaxlemainreducerisinstalledonawheelspeedsensororontherearwheelstoinstalla.TheperformancecharacteristicsofSinglechannelABSaregenerallyoflowtworearwheelsaccordingtotheprincipleofchoosecontroltogether.SinglechannelABScannotmakefulluseofthetworearwheelsadhesion,sobrakingdistanceisnotnecessarilywillbesignificantlyreduced.Additionallythefrontwheelbrakingcontrol,brake,brake,holdingindeathofthefrontwheelwillappearwhentheabilityofsteeringdidnotimprove,butsincethetworearwheelswontlockwhenbraking,cansignificantlyimprovethedirectionstabilitywhenbraking,onsafetyisabigadvantage,atthesametime,simplestructure,lowcostadvantages,sowidelyusedinlighttruck.Tosumup,althoughABSdevicehasshortenbrakingdistance,inaddition,differenttypesofABSplantduetoreasonssuchasthestructure,thepricealsodiffers,tochooseandbuycarscannotonlyseetheprice,butshouldalsoseewiththattypeofABSdevice.advantagesLockingwhenthewheelisabouttoreachthenextpoint,brakeoilpressuremakestheairbagrepeatedrole,soinasecondrole60120times,equivalenttoconstantlybraking,relaxation,thatis,similartomechanicalDianCha.Therefore,ABSantilockbrakingsystem,toavoiddirectionoutofcontrolandwheelsideslipwhenemergencybraking,thewheelwhenthebrakesarenotlocked,dontletthetirefrictionwiththegroundatonepoint,soastoincreasethefriction,thebrakeefficiencyof90ormore,atthesametimealsocanreducethebrakeconsumption,prolongbrakewheeldrumanddiscandtheservicelifeoftirestwice.VehiclesequippedwithABSondryasphalt,rain,snowandotherpavementskidresistancewere80,90,10,90,15,20.limitationsABSsystemitselfalsohaslimitations,itstillcantgetawayfromacertainphysicallaws.Inbothcases,ABSsystemcantprovidetheshortestbrakingdistance.Oneisinthewayofsmooth,dry,directlybytheexperienceddriverstobrake.Anothercaseisintheloosegravelroadsurface,roadsurfacedirtorsnowdeeproadbrakingInaddition,usuallyinoneplane,thelatestABSsystemcanslipratecontrolintherangeof520,butnotallatthesamerateofABSbrakingorthesamelevel.Althoughfourwheelbrakingsystemcanmakethecartopreventionbrakecarriedoutwithintheshortestpossibledistance,butifthebrakeisgoingtoolate,socantcompletelystopbeforecollisionswithobstacles,arestillunabletopreventtheaccident.TheworkingprincipleofBrakemastercylinderThebrakepedalmotorStoragetankTheABScontrolunitBrakewheelcylinderWheelspeedsensorThewheelsWhenbraking,ABS,accordingtothespeedofeachwheelspeedsensortransmitssignalscanrapidlydeterminethewheellockstate,closetolockthewheelsoftheaboveinputsolenoidvalvenormallyopen,letthebrakingforceisconstant,ifthewheeltolockandopenanormallyclosedoutputelectromagneticvalve,thewheelbrakepressureduetothebrakefluidstoragetankofthepipelineandquicklydown,topreventthewheelbrakingforceistoolargeandwillsimplybelock.ToremainthebestbrakingstatepointsliprateSof20,brakingeffectisbest,themostsafedriving.AntilockbrakingsystemThebrakefluidinfrontofthebrakemastercylindercavityisdynamicpressurebrakefluid,itpromotethereactionsleevetotheright,thereactionsleeveandpushthepowerpistonsothatthebrakepedalputtermovetotheright.InABSworkingtime,therefore,thedrivercanfeelfootpedaltovibrate,heardsomenoise.Carslowdownafter,oncetheABSwheellockcomputerdetectedstatedisappear,itwillmakethemaincontrolvalveclosed,sothatthesystemintotheordinaryworkunderbrakingcondition.Ifthepressureoftheaccumulatordroppedtobelowthesafetylimits,redbrakefailureindicatorandamberABSfaultindicatorlightislit.Inthiscase,thedrivershouldusegreaterforcefordeepsteponthepedalbrakingabilitytothefrontandbackbrakeeffectively.TheworkingprocessoftheInABS,eachwheelsetaspeedsensor,willbeoneachwheelspeedsignalinputoftheelectroniccontrolunit.Electroniccontroldeviceaccordingtoeachwheelturningsensorinputsignalsforeachwheelformonitoringanddeterminethemotionstateofandformationofthecorrespondingcontrolcommand.Varioushydraulicsolenoidvalvesareclosedwithoutelectricity,electricpumpisnotelectricity,brakemastercylindertothebrakelineofeachwheelcylinderarestillinthestateofcommunication,andthebrakepipeofthebrakewheelcylinderandaccumulatorareinaclosedstate,eachwheelcylinderbrakepressurewillchangealongwiththeoutputpressureofbrakemastercylinder,brakeprocessatthistimewithconventionalbrakingsystemofthebrakingprocessisexactlythesame.Intheprocessofbraking,theelectroniccontrolunitbasedonwheelspeedsensorinputwheelspeedsignalareascertainedwheeltendstolock,ABSantilockbrakepressureregulationisenteredintotheprocess.Electroniccontroldevices,forexample,todeterminewhentherightfrontwheeltendstolock,electroniccontrolunitmakesthecontrolrightfrontwheelbrakepressureliquidintothesolenoidvalveelectricity,electromagneticvalvetoclosetherightfrontintoliquidstate,brakemastercylinderoutputbrakefluidisnolongerintotherightfrontwheelbrakingcylinder,theelectroniccontrolunitmakestherightfrontintohydraulicsolenoidvalveandsolenoidvalveofproducedliquidandelectricityintohydraulicsolenoidvalvetoopen,usehydraulicsolenoidvalvetoclosestate,alsomakeelectricpowerpumprunningatthesametime,tosendthebrakefluid,brakewheelcylinderbrakefluidoutputbyabrakemastercylinderandelectricpumppumpingthebrakefluidareinanopenpositionrightfrontintohydraulicsolenoidvalveintotherightfrontwheelcylinder,maketherightfrontwheelcylinderbrakepressureincreasedrapidly,rightfrontwheelandbegantoslow.ABSbymakingtendtolockthewheelbrakepressurecyclingtokeepincreasewiththedecreaseofprocessexperience,andwilltendtolockthewheelslipratecontrolneartheadhesioncoefficientofslidingraterange,correspondingtoeachintheABSwheelcylinderhasapairofeachintothefluidandthefluidelectromagneticvalve,canbecontrolledbyanelectroniccontroldevice,respectively,asaresult,eachwheelcylinderbrakepressurecanbeindependentlyadjust,sothatthefourwheelbrakelockphenomenondoesntoccur.DespitevariousABSstructureandworkprocessisnotexactlythesame,butisbasedontendtolockthewheelbrakepressureforadaptivecycleadjustment,topreventthecontrolwheelbrakelock,andavarietyofABSinthefollowingaspectsarethesame.1afterthecarspeedexceedsacertainABSjuste.g.,5km/hor8km/h,willtendtolockinthebrakingprocessofwheelantilockbrakepressureregulation.Speedwhenthecarisbrakingtoreducetoacertain,ABSwillautomaticallysuspendtheantilockbrakepressureregulation,sincethen,equippedwithABSautomotivebrakingprocesswillbethesameastheconventionalbrakingofthebrakingsystem,wheelbrakelockonthecarbrakelock.Thisisbecausethecarsspeedisverylow,wheelbrakelockistheimpactontheautomobilebrakingperformanceisverysmall,andseetoitthatcarparkingbrakeassoonaspossible,shouldhavetomakethewheelbrakelock.2inthebrakingprocess,onlywhenthecontrolwheeltendstolock,ABStotendtolockthewheelstoantilockbrakepressureregulationNottendtolockinthecontrolledwheels,brakingandbrakingprocessofconventionalbrakingsystemisexactlythesame.3theABShasselfdiagnosisfunction,abletoworkonthesystemofconditionmonitoring,oncefoundthenormaloperationsystemfailurewillautomaticallyshutdowntheABS,andABSwarninglightwilllightup,alertthedriversignal,theautomobilebrakingsystemcanstilllikeaconventionalbrakingsystemforbrake.troubleshootingABSmaintenancemattersneedingattentionABSandordinarybrakingsystemareinseparable,ordinarybrakingsystemonceappearproblem,ABScantworknormally,therefore,willbothasawholeforrepair.ABSwashighlysensitivetotheovervoltage,staticelectroniccontrolunitECU,ifyouhaveaccidentallywilldamagethechipintheelectroniccontrolunitECU,resultedfromtheABS.Therefore,ignitionseikoclosingonelectroniccontrolunitECUforoutdateddontinsertorpullouttheconnectorBeforethecarforwelding,weargoodantistaticappliancesalsoavailableleadawoundonthebody,removetheelectricalconnectorontheunitbeforeforweldingDevotedtothebatterycharging,willremovethebatterycablefromthecarbatteryrechargedagainafter.Beverycarefulwhenturnmaintenancewithsensor,removetheattentionnottotouchthesensorheadinjury,donotusesensorsgearringwhenpry,lestdamage.Wheninstallationshouldbecoatedwithantirustoil,theinstallationprocessisadjustabletaporbruteforce.Undernormalcircumstances,thesensorofairgapisadjustablealsohaveanadjustable,adjusttheapplicationofnonmagneticfeelere.g.,plasticorbrassfeeler,ofcourse,alsocanuseapieceofpaper.WhenmaintenanceABShydrauliccontroldevice,bearinmindthatpressure,againaccordingtotheprovisionsofrepair,inordertoavoidthehighpressureoiljetcuts.Thebrakefluidreplacementonceeverytwoyearsatleast,itisbesttochangeonceayear.ThisisbecausethehygroscopicityofDOT3glycolbrakefluidisverystrong,moisturecontentofnotonlyonthebrakingsysteminternalbrakefluidcorrosion,andcanmakebrakingeffectobviousdrop,influencethenormalworkoftheABS.BecarefulnottousesiliconeDOT5brakefluid,replacementandstoragebrakefluidandvesselstoclean,donotletthedirtanddustintothehydraulicsystem.DonttouchthebrakefluidtotheelectroniccontrolunitECUforABS

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