远程诊断和汽车维修系统概述

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1、英文资料OverviewofRemoteDiagnosisandMaintenaneeforAutomotiveSystems1.INTRODUCTION1.1.CurrentvehiclediagnosisAllcarsandlighttrucksbuiltandsoldintheUnitedStatesafterJanuary1,1996arerequiredtobeequippedwithOn-BoardDiagnosticsII(OBD-II).WhiletheprimaryimpetusforOBD-I

2、Iwasdiagnosticsforemissionsystems,therangeofvehiclesub-systemsaddressedbythisstandardisquitebroad.TheOBD-llDiagnosticTroubleCodes(DTCs)aremadeupof5digits[1].Whilethesecodesareusefultoidentifyfaultysubsystems,theyaretypicallynotsufficienttoidentifyspecificfaul

3、tycomponents.ThetroublecodesaretypicallyaccessedthroughascantoolthatispluggedintoaspecialOBD-llvehicleconnector.Thisconnectorislocatedinthepassengercompartmentandcanbeaccessedfromthedriver'sseat.Hand-heldscantoolsareusuallylimitedtovehiclesfromoneormoremanufa

4、cturer.Ingeneral,Chryslerproducts,allEuropeanandmostAsianimportsusetheISO9141standardforin・vehicleOBD-IIcommunications.GMcarsandlighttrucksuseSAEJ1850VPWM(VariablePulseWidthModulation),andFordsuseSAEJ1850PWM(PulseWidthModulation)1.2.Problemswithcurrentvehicle

5、diagnosisApproachesFromabovedescriptionwecansee,thereareseveralproblemsinthecurrentapproachtovehiclediagnosis.1.Thediagnosisisnotstandardizedamongvehiclemanufacturers.Thisleadstohighercostswhenvehiclesfromdifferentmanufacturersaretobediagnosedbyagivenfacility

6、・1.Thediagnosisrequiresdrivingtoarepairfacility.Thisisaninconveniencetothedriverandasourceofuncertaintyinschedulingvehiclediagnosisandrepair.Thedrivermaybetoldtoleavethevehicleforthedaywhentheproblemcanbesolvedinanhour・2.Acompletediagnosismayneedspecialequipm

7、entandtrainedtechnicianhelp・Thiscanmakethediagnosisveryexpensive.3.TheDTCinformationistypicallynotaccurateenoughtopinpointthesourceoftheproblem.Bettervehiclediagnosticalgorithmsandstrategiescouldreducethetimeneededtodiagnoseproblems.4.Withtheincreasedsophisti

8、cationofelectroniccontrolsystemsinvehicles,thereisaconcomitantincreaseinthedifficultyofidentifyingcomponentmalfunctions-Onesymptomofthisisthediagnosisofreplacedpartsas"notroublefound,L3>C