Clutch Unit And Control Module

Fig 1: Clutch Unit And Control Module

Courtesy of VOLVO CARS CORPORATION

The hydraulic section consists of 1-7, the mechanical consists of 8-10 and the electronic section consists of 11-13:

1. Check valves, exhaust side
2. Accumulator
3. Oil filter
4. Ring shaped annular piston
5. Control valve/axial solenoid
6. Check valve, intake side
7. Combined check and by-pass valve
8. Inner and outer wet clutch plates
9. Inner connection hub with splines for output shaft. The hub has a sinusoidal cam curve
10. Input shaft
11. Electrical feed pump.
12. Differential electronic module (DEM)
13. Oil pressure and temperature sensor

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.