E39_E53_E65 Air Suspension Level Control System

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      NOTETheinformationcontainedinthistrainingcoursemanualisintendedsolelyforparticipantsoftheBMWServiceTrainingcourse.Refertotherelevant"TechnicalService"informationforanychanges/supplementstotheTech

2、nicalData.©2002BMWAGMünchen,Germany.ReprintsofthismanualoritspartsrequirethewrittenapprovalofBMWAG,MünchenVS-42MFP-HGK-BRK-EHC_0530ContentsPageCHAP1AirSuspensionLevelControlSystem1History1-General1Introductiontoairsuspension5-General5Pneumaticsdiagram7-Single-axle

3、airsuspension7-Twin-axleairsuspension8Systemoverviews9-E39electricalsystemschematichigh(MY2002)9-E65/E66electricalsystemschematic(MY2002)10-E53electricalsystemschematichigh(MY2002)11Airsuspensioncomponents12-Graphicalsystemoverview12-Airsupplyunit(LVA)14-Controlun

4、it(EHC)15-Airsuspension16-Rideheightsensor21-Pressureaccumulatorvalveunit22-CheckControlmessages23-Controlbutton25Airsuspensionfunction26-Modeloverviewtable26-Controlmodeflowcharts27-Controlmodeoverviewtable30-Faults32-Explanationofterms32-Controlmodes35Operatingp

5、rinciple46AirSuspensionLevelControlSystemAirSuspensionLevelControlSystemHistory-GeneralThefunctionofthelevelcontrolsystemistomaintaintheheightofthevehiclebodyascloselyaspossibleataprespecifiedlevelunderallloadconditions.Thankstotheextensivelyconstantlevel,thegeome

6、tricwheelsuspensiondata(e.g.wheelcamber,toe-in)remainunalteredbytheload.Theridecomfortisalsonotdependentontheload.Theheadlightrangeremainsextensivelyconstantovertheentireload.BMWpreviouslysuppliedlevelcontrolsystemsasbothspecialequipmentand,inpart,asstandardequipm

7、entontheBMW7Series-E23/E32,6Series-E24and5Series-E12/E28.HydropneumaticsuspensionPartiallyloadedhydropneumaticrear-axlesuspensionformsthebasisofthesesystems.Itissimilarinitsbasicprincipletopureairsuspension.Howeveritoperateswithavolumeofgaswhichispermanentlycontai

8、nedinthepressureaccumulator(i.e.constant).Thegasusedisnitrogen.Theinternalchamberofthepressureaccumulatorisdividedbyadiaphragmintoindividualgasandhydrau