宝马7系维修维修手册(MFP-BRK-E65-FAHRDYNAMIKSYSTEME-e)


  NOTETheinformationcontainedinthistrainingcoursemanualisintendedsolelyforparticipantsoftheBMWServiceTrainingcourse.RefertotherelevantTechnicalServiceinformationforanychanges/supple-mentstotheTechnicalData.©2001BMWAGMünchen,Germany.ReprintsofthismanualoritspartsrequirethewrittenapprovalofBMWAG,MünchenVS-42MFP-HGK-BRK-E65_0500ContentsPageCHAP1Introduction1CHAP2ABS/ASC/DSC2Introduction2Functions(overview)2-DSCinbusnetwork3Functionaldescription4-ElectronicallyControlledDeceleration(ECD)5-FadingBrakeSupport(FBS)6-Driving-performancecontrol(FLR)7-DynamicTractionControl(DTC)7-Parkingbrake(hydraulicsection)8Systemstructure(components)9-Componentsofhydraulicsystem10-Sensors11CHAP3EDC-K12Introduction12-History13Functionofsystem14Systemoverview16Functionaldescriptionofcomponents18-Controlunit18-Powersupply19-Vertical-accelerationsensors21-Electronicallyadjustablevibrationdampers22-Infinitelyvariablecontrolvalve24Operation27Diagnosis28NotesonService28CHAP4DynamicDrive29Introduction29DynamicDriveoverview31-DynamicDriveintheBUScombination40Descriptionofcomponents41Functionaldescription58-Startingcharacteristics,entireDynamicDrivesystem58-Operatingconditions61NotesonService66-DynamicDrivecommissioning67-DynamicDriveventilation68E65DrivingDynamicsSystems-1-IntroductionModernchassisandsuspensionsmustofferdriversoptimumdrivingcomfort,highdrivingsafety,ahighdegreeofagilityandsimplehandling.Furthermore,itmustalsobeabletoadapttochangedconditions(roadandtrafficconditions,ice,snowetc.).Thefollowingmovementsofthevehiclebodycanoccurasaresultoftheactingforces:-Aboutthetransversalaxis:pitching-Aroundthelongitudinalaxis:rolling-Abouttheverticalaxis:yawingThetaskofthechassisandsuspensionistosuppresstheeffectsoftheseforcesasmuchaspossible.Activedriving-dynamicssystemsareintegratedintheE65whichsupportthedriverbothactivelyandpassively.Thedriving-dynamicssystemsrecordthedrivingconditionsusingthesensors.Thesearetransmittedtothecontrolunitswhichthenconverttheinputsignalsandsendoutputsignalstotherelevantactuators.Thedriving-dynamicssystemsinclude:-TheDynamicStabilityControl(DSC)withsubsystems-ThecontinuallyadjustableElectronicDampingControlsystem(EDC-K)-TheactiverollstabilizerDynamicDriveE65DrivingDynamicsSystems-2-ABS/ASC/DSCIntroductionBoschDSC5.7hasbeenimprovedindetailandexpandedtoincludenewfunctionsinordertoachieveimprovedsystemoperation.ThesystemisconnectedtothePT-CAN.Functions(overview)TheDSCmodulecontrolsbymeansofbrakeinterventionorforindividualsituationsbymeansofengine-loadcontrol.Itconsistsofthefollowingsubsystems:-ABSAnti-lockBrakingSystem-ASCAutomaticStabilityControl-MSREnginedrag-torquecontrol-DSCDynamicStabilityControl-DBCDynamicBrakeControl-CBCCorneringBrakeControl-ECDElectronicallyControlledDeceleration(withACConly)-FBSFadingBrakeSupport-FLRDriving-performancecontrol-DTCDynamicTractionControl-Parkingbrake(hydraulicsection)Inaddition,theevaluationofthe2-stagebrake-liningwearsensorshasbeenintegratedintheDSCcontrolunit.Thesetupandmodeofoperationofthebrake-liningwearsensorsisdescribedintheBackgroundMaterialBrakes.E65DrivingDynamicsSystems-3--DSCinbusnetworkFig.1:BUSstructureKT-8932E65DrivingDynamicsSystems-4-Functionaldescription-ABSAnti-lockBrakingSystemNotes:_________________________________________________________________________________________________________________________________________-ASCAutomaticStabilityControlNotes:_________________________________________________________________________________________________________________________________________-MSREnginedrag-torquecontrolNotes:_________________________________________________________________________________________________________________________________________-DSCDynamicStabilityControlNotes:_________________________________________________________________________________________________________________________________________E65DrivingDynamicsSystems-5--DBCDynamicBrakeControlNotes:_________________________________________________________________________________________________________________________________________-CBCCorneringBrakeControlNotes:_________________________________________________________________________________________________________________________________________-ElectronicallyControlledDeceleration(ECD)ECDrespondstotherequestsoftheACC(ActiveCruiseControl)signals.DSCexecutesbrakingretardationwhendecelerationisrequestedbyACC.Thisisperformedbywayofanautomaticbrakeinterventionatthefourdiscbrakes,dependentonthevehiclespeed,thedistanceandthespeedofthevehicletravellinginfront,withmax.3m/s2deceleration.Ondownhillgradientsatapreselecteddrivingspeed,ECDmaintainsthedrivingspeedcontinuouslyatthepresetvaluebywayofautomaticbrakeintervention.E65DrivingDynamicsSystems-6-Inthecaseofautomaticbraking,thebrakelightsareactivatedinlinewithlegalrequirements.Onlyfromadeceleration1m/s2willabrake-lightactivationbeperformedbythelightmodule(LM).Thispreventsthebrakelightsfromcomingonfrequentlyandforbriefperiods