Active On Demand Coupling (AOC)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
The main role of Active On demand Coupling and the differential electronic module (DEM) is to regulate the four-wheel drive function, i. e. the distribution of drive between the front and rear axles. The system consists of a coupling combining mechanical, hydraulic and electronic sections. The coupling unit is on the rear axle, between the differential gear and the propeller shaft. The mechanical and hydraulic sections are driven by the rotation of the propeller shaft.
Active On demand Coupling (AOC) has the following characteristics:
- Permanent all wheel drive with electronic control of torque transfer
- Driving characteristics similar to all wheel drive
- Quicker reactions
- No wind-up during slow speed maneuvers and parking
- The system is not sensitive to differences between tires (when driving with a spare wheel for example)
- The system is not sensitive to being towed with one axle raised
- Unaffected by brake tests on a chassis dynamometer.