Clutch Unit And Control Module

Fig 1: Cutaway View of Clutch Unit And Control Module

Courtesy of VOLVO CARS CORPORATION

1. Accumulator
2. Oil filter
3. Pressure reducing valve
4. Inner and outer wet clutch plates
5. Inner connection hub with splines for output shaft. The hub has a sinusoidal cam curve
6. Input shaft
7. Electrical feed pump.
8. Differential electronic module (DEM)
9. Non-return valve
10. Annular piston

The Differential Electronic Module (DEM) is fitted on the clutch unit housing.

The Differential Electronic Module (DEM) communicates with other control modules via Controller Area Network (CAN) communication:

The control module has integrated diagnostics for its own components and functions.