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Home >> Volvo >> 2009 >> V70 >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Differential Electronic Module (DEM), Driver Information Module (Dim), Engine And Engine Control Module (ECM) - Design And Function >> Differential Electronic Module (DEM) (2009-2010) >> System Overview >> Active On Demand Coupling (AOC)
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Active On Demand Coupling (AOC)

Fig 1: Active On Demand Coupling (AOC)
GLL165340Courtesy of VOLVO CARS CORPORATION

Active On demand Coupling (AOC) and its Differential electronic module (DEM), has as its most important function to control the function for four-wheel drive, that is, power distribution between front and rear axle.

The system consists of an integrated clutch with a mechanical, a hydraulic, and an electronic part.

The clutch unit is located on the rear axle, between the final drive and the propeller shaft. The mechanical part is driven by the propeller shaft. The hydraulic part is driven by an electric pump.

Active On demand Coupling (AOC) generation 4 enables the following characteristics: