Active On Demand Coupling (AOC)
The most important function of Active On demand Coupling (AOC) and its Differential Electronic Module (DEM) is to control the four-wheel drive function, i. e. power distribution between front and rear axles. The system consists of a clutch assembly with a mechanical, hydraulic and electronic section. The clutch unit is located on the rear axle, between the final drive and the propeller shaft. The mechanical section is driven by the propeller shaft. The hydraulic section is driven by the difference in speed arising between propeller shaft rotation and rear axle rotation.
Active On demand Coupling (AOC) enables the following characteristics:
- Permanent four-wheel drive with electronic control of transferred torque.
- A driving character equivalent to front-wheel drive.
- Rapid reactions.
- No opposing forces when maneuvering or parking.
- The system is not so sensitive to differences between the tires, e. g. when driving with the spare wheel.
- Not sensitive to towing with an axle lifted.
- Not sensitive to brake testing on a chassis dynamometer.