Clutch Unit And Control Module

Fig 1: Coupling Unit And Control Module

Courtesy of VOLVO CARS CORPORATION

The hydraulic section consists of 1-5, the mechanical consists of 6-10 and the electronic section consists of 11-13:

1. Pressure valves
2. Accumulator
3. Oil filter
4. Ring pistons
5. Control valve/axial solenoid
6. Input shaft
7. Inner and outer wet clutch plates
8. Inner clutch hub with sine shape cam disc
9. Rollers with ring pistons
10. Output 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 an integrated diagnostic system.