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1、车载自动诊断系统OBD技术解析:.OBD:OBDisEnglishOn-BoardDiagnosticsabbreviation,Chinesetranslationfornautomaticon-boarddiagnosissystem".Thissystemwillbefromtheengineoperatingconditionsmonitorwhethertheautomobiletailgasexceedthestandard,onceexceedthestandard,willbeimmediatelyissuedawarning.Whenthesyst
2、emfailure,failure(MIL)checkengine(CheckEngine)warninglights,atthesametimethepowertraincontrolmodule(PCM)faultinformationwillbestoredinmemory,throughcertainproceduresfaultcodescanbereadfromthePCM・Accordingtotheindicationoffaultcodes,repairpersonnelcandeterminethenatureandlocationoffault
3、quicklyandaccurately.FromtwentiethCenturysince80,theUnitedStatesandJapan,EuropeandothermajorautomobilemanufacturingenterprisesbeganintheproductionofEFIvehicleequippedwithOBD,theinitialOBDisnotselfcheckingfunction.OBD-ismoreadvancedthantheOBDIIintwentiethCentury90timemetaphase,Americans
4、ocietyofAutomotiveEngineers(SAE)developedasetofstandardspecification,requirementeachautomobilemanufacturingenterprisestoprovidediagnosismodelaccordingtounifiedOBD-IIstandards,intwentiethCentury90yearslate,thecarenteredtheNorthAmericanmarketinaccordancewiththenewstandardsettingOBD.OBD-I
5、Iandallonboardbeforeselfdiagnosticsystemisdifferentwiththestrictemissionstargeted,thematteroffactistheperformanceofvehicleemissionsmonitoring・Whenthevehicleemissionsofcarbonmonoxide(CO),hydrocarbons(HC),nitrogenoxides(NOx)orfuelevaporationamountofpollutionexceedsthesetstandard,thelampw
6、illlightfaultalaim.AlthoughtheOBD-IIisveryeffectiveforvehicleemissionsmonitoring,butthedriveracceptancewarningallby"consciousness".Therefore,OBD-ismoreadvancedthantheOBD-IIIIIproduced.OBD-IIImainpurposeistomakethevehicledetection,maintenanceandmanagementasawhole,inordertomeettherequire
7、mentsofenvironmentalprotection.OBD-systemcanrespectivelyintotheengine,gearbox,ABSECUsystem(computer)toreadthefaultcodeandotherrelateddata,andtheuseofsmallvehiclecommunicationsystem,suchasGPSnavigationsystemorwirelesscommunicationmanagementdepartmentwillautomaticallynoticevehicleident
