GMW 14351Sep2005Brake Drag Measurement.pdf

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1、WORLDWIDETestProcedureENGINEERINGGMW14351ChassisSTANDARDSBrakeDragMeasurement3.2.3Duringabrakeapplicationwithnorotor1Scoperotation,thefollowingmeasurementsshallbemadeanddigitallyrecordedat50Hz.Note:Nothinginthespecificationsupersedesapplicablelawsandregulationsunlessspecific3.2.3.1Time(s)

2、exemptionhasbeenobtained.3.2.3.2Brakelinepressure(kPa)3Note:IntheeventofconflictbetweentheEnglish3.2.3.3Fluiddisplacement(mm)anddomesticlanguage,theEnglishlanguageshall3.2.4Duringabrakedragmeasurement,hydraulictakeprecedence.pressureshallbezeroandtherotorsspunatthe1.1Purpose.Thisprocedure

3、isalaboratorytestrequiredrotationalspeed.Thefollowingproceduretomeasurecaliperbrakedragandfluidmeasurementsshallbemadeanddigitallydisplacement.recordedat50Hzforaperiodof120±1seconds.1.2Foreword.Thisprocedureisusedtomeasure3.2.4.1Time(s)caliperbrakedragoverarangeofcaliper3.2.4.2Rotorspeed(

4、rpm)experiencedpressures.Thisprocedureisalso3.2.4.3Braketorque(N-m)usedtomeasurefluiddisplacementduringpressureapplieswithnorotorrotation.3.3TestVehicle/TestPiece.NotApplicable.1.3Applicability.Thisprocedureisapplicableto3.4TestTime.allpassengercarandlighttruckbrakecorners.Calendartime:0.

5、5to1DaysTesthours:3to6Hours2ReferencesCoordinationhours:1to2HoursNote:Onlythelatestapprovedstandardsare3.5TestRequiredInformation.NotApplicable.applicableunlessotherwisespecified.3.6Personnel/Skills.One(1)techniciancapable2.1ExternalStandards/Specifications.ofperformingthedutiesdescribedi

6、nSection4isrequired.None2.2GMStandards/Specifications.4ProcedureGMN52284.1Preparation.4.1.1Thefrontbrakecornersshallbeburnished3Resourcespriortotestingpersection1.4.6BrakeBurnish3.1Facilities.MilfordProvingGroundChassisScheduleofGMN5228.ComponentDevelopment(CCD)RotorThickness4.1.2TheRTVdy

7、namometerloadcellsshallbeVariation(RTV)dynamometerorequivalentTestcalibratedpertheRTVdynamometeruser’sImprovementProcess(TIP)approvedtestfacilitymanual.shallbeused.4.1.3Therotorandcaliperassembliesshallbe3.2Equipment.installedusingproductionrepresentativefastener3.2