Active On Demand Coupling (AOC)
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 final drive and the propeller shaft. The mechanical section is partly driven by the propeller shaft. The hydraulic section is driven by the difference in rotation speed between the propeller shaft and rear axle.
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 very 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.