Tiguan Haldex All-Wheel Drive - Freel2.com

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OverviewOverviewHistoryIn 1998, 4MOTION drive replaced synchro all-wheeldrive at Volkswagen. While the synchro all-wheeldrive used a visco clutch, an all-wheel clutch byHaldex was used for the first time in the 4MOTIONdrive.First Generation Haldex ClutchWith this hydraulic multiplate clutch, the all-wheeldrive could be controlled electronically. Apart fromslip control, the control module also allowed handlingdynamic driving conditions such as curves, speed,and overrun, or load operation.Function of Haldex ClutchesThe first two generations of the Haldex clutch usea rotational speed difference between the front andrear axles to operate. A pump effect is generatedusing a cam plate, rollers, and two reciprocatingpistons working in parallel. This creates oil pressurethat compresses the multiplate clutch througha working piston. The drive torque transferreddetermines the amount of pressure applied.Generation II Haldex Clutch from Model Year 2004S414_003The pressure on the multiplate disks of the clutch isregulated through:• Suction valves• Pressure valves• Electronic control valve• Control moduleS414_004
OverviewHaldex Generation IVAll-Wheel Drive ClutchThe power transfer through the multiplate pack ofthe generation IV all-wheel drive clutch is nearlyidentical to the previous Haldex models. Generatingthe pressure with an electric pump is a new feature.The torque to be transferred is determined by AllWheel Drive Control Module J492 through theselection of Haldex Clutch Control Valve N373. Speeddifferences between the front and rear axles are nolonger a prerequisite for activating the all-wheel driveclutch.Advantages• Clutch selection independent from the drivingsituation• Rapid torque build-up• Permanent rear wheel drive capacity• Unrestricted compatibility with the slip controlsystems (e.g. ESP, ABS)Technical Features• Electro-hydraulically controlled multiplate clutch• Integrated in the rear axle drive• Simplified hydraulic circuit• Optimized demand-controlled pump selectionS414_005
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Page 8 and 9: DrivetrainDrivetrain4MOTION Drivetr
Page 10 and 11: DrivetrainPropeller ShaftThe propel
Page 12 and 13: DrivetrainFunction of the All-Wheel
Page 14 and 15: All-Wheel Drive Clutch DetailsMecha
Page 16 and 17: All-Wheel Drive Clutch DetailsElect
Page 22 and 23: ControlsPressure Buildup at Engine
Page 24 and 25: ControlsCritical Driving Situations
Page 26 and 27: ControlsFunctional Diagram30J540J10
Page 28 and 29: Notes24
Page 32: Volkswagen of America, Inc.3800 Ham

Tiguan Haldex All-Wheel Drive - Freel2.com

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