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1、汽车制动系的故障诊断1（Faultdiagnosisofautomobilebrakesystem1）FaultdiagnosisofautomobilebrakesystemFaultdiagnosisofpneumaticbrakesystemBrakingperformanceisnotgood,brakingpowerisinsufficientFaultphenomenonIntheprocessofdriving,thebrakingforceisobviouslyinsufficient.Ingeneralbraking,itisnecessarytostep
2、onandincreasethepedalstrokeearlierthanusualinordertoachievethedesiredbrakingeffect;whileintheemergencybraking,thebrakingdistanceincreasessignificantly,andthebrakingtimeincreases.FailurecauseThepressureofthecompressedairinthestoragetankisinsufficient.Thefreetravelofthebrakepedalistoolarge.A
3、brakelineofadoublechannelbrakesystemruptureswithoutcausingbrakeaction.Theadjustingboltoradjustingscrewofthebrakevalveisimproperlyadjusted;theexhaustvalvereturnspringisexcellentortheadjustingshimistoothick;theelasticityofthebalancespringislowerthanthetechnicalrequirement.Brakedrumandbrakesh
4、oeclearanceimproper;thecontactareaofthebrakedrumandthebrakeshoeistoosmall;thebrakeshoesofpoorqualityorcontaminated,brakeshoerivetsloose;thebrakedrumdeformation,producegroovewearorfailurecircle;brakecamshaftandshaftsleeve,thebrakeshoeandtheeccentricpinconnectorrustorwearloose;brakeshoelinin
5、gistoothin,thebrakecamangleistoolarge.Thereisaleakinthebrakeline.Ruptureofbrakechamberbowl.Brakehoseageing.DiagnosisandremovalThepressurebrakeperformanceispoor,toagreatextent,relatedtothepressureofthecompressedair.Therefore,firstofall,thebarometervaluesshouldbechecked.Iftheairpressureistoo
6、low,checkwhetherthefaultisintheaircompressororinthepipeline.Iftheenginerunforalongtime,thepressureisnotincreased;aftertheengineflameout,thepressureisnotreduced,mostlyfortheaircompressorfault,suchasV,aircompressorpumpbelt,pressureregulatingvalveregulatingpressure(pressureunloading)istoolowa
7、ndtheairreservoirsafetyvalvedischargepressureistoolow.Iftheenginerunforalongtime,thepressurerisesslowly;enginepressurecontinuestodrop,thatmeansthesystemhasleakage,suchasreservoirsafetyvalveleakage,aircompressorandairreservoirpipelinebetweenthegasandbrakepedalf
