Adaptive cruise control builds on the functionalities of the cruise control system and, within certain system limits, maintains the correct distance from the vehicle in front – automatically: the system uses a special radar sensor to measure the distance from the vehicle ahead. If the distance is too small, the system reduces speed moderately by easing the throttle or it automatically activates the brakes, up to approximately 25% of maximum vehicle deceleration. Once the road ahead is clear again, adaptive cruise control accelerates the car back up to the speed previously set.
If the braking process activated by the adaptive cruise control does not decelerate the vehicle sufficiently, an acoustic signal is triggered immediately to warn the driver to intervene manually. An outstanding feature of adaptive cruise control is its driving dynamics. The user can choose between four programs. Distance 1 (sporty), Distance 2 and 3 (standard), and Distance 4 (comfortable). The Distance 1 program maintains a short distance from the vehicle in front and accelerates swiftly back up to the journey speed set if the road ahead becomes clear.
The Distance 2 and Distance 3 programs allow the vehicle to flow along quickly with the flow of traffic. The Distance 4 program is used on country roads and when towing a trailer. Even if adaptive cruise control is activated, the driver is still responsible for monitoring his vehicle’s speed and the distance from the vehicle in front. Adaptive cruise control does not react to stationary objects or approaching vehicles. It should not be used on winding roads or in adverse weather conditions such as fog, ice or heavy rain.
On the Audi A6 the driver can choose additionally between three driving programs – dynamic, standard and comfort – and set the adaptive cruise control system to suit his driving preferences.
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