1. PRE-SAFE brake: world premiere of the first autonomous braking system

2. Field Trials and Testing in the simulator

3. Operation and function in detail

Operation and function in detail: How the new PRE-SAFE® brake works

Stuttgart, Jun 21, 2006

Operating concept:
The system is activated at the touch of a button on the multifunction steering wheel and details appear in the central instrument cluster display. The “PRE-SAFE® brake” menu item is part of the “Assistance” control area.
Whenever proximity control – and hence the PRE-SAFE® brake – is active, a permanent symbol appears in the instrument cluster.

Range:
The PRE-SAFE® brake is active in the speed range between 30 and 180 km/h, provided vehicles have been registered up ahead. The system also reacts when approaching a stationary queue of traffic, as long as the S-Class is not travelling at over 70 km/h. Cars coming in the opposite direction, sudden obstacles or other vehicles which appear, for example, in the side of the radar area at junctions are ignored. The system is not available where the radar signals encounter objects made from materials with a poor reflective quality or where the sensors are impaired by external factors such as dirt or snow.

Warnings:
If the gap between the car and the vehicle in front becomes too small, a red warning triangle appears in the tachometer. If there is a danger of an accident, an addi-tional warning tone is sounded. Once three warning tones have been emitted (approx. 1.6 seconds before the calculated impact), the PRE-SAFE® brake automatically intervenes and begins autonomous partial braking, unless the driver has already reacted. Pre-emptive protective measures in the interior are also activated.

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