BMW G12 - Page 26

G12�Driver�Assistance�Systems
7.�Collision�Warning
20
Index Explanation
a Close�range
b Long�distance
1 KAFAS�stereo�camera�detection�range
2 Detection�range�of�the�radar�sensor
The�corresponding�warning�stages�"early�warning"�and�"acute�warning"�are�output�in�critical�situations
on�the�basis�of�the�calculated�positions,�distances�and�relative�speeds�of�other�vehicles.�For�the�early
warning�the�brakes�of�the�vehicle�are�prepared�for�emergency�braking�and�the�activation�thresholds�of
the�Dynamic�Brake�Control�are�reduced.�If�the�driver�makes�the�conscious�decision�to�drive�up�close
to�the�vehicle�ahead,�warnings�which�may�otherwise�be�distracting�can�be�prevented�by�reducing�the
sensitivity�of�the�system.
7.1.1.�Collision�warning�with�city�braking�function
The�collision�warning�with�city�brake�activation�(City�Collision�Mitigation�option�OE�ZN3)�adds�a�brake
activation�function�to�the�camera-based�collision�warning�from�a�speed�of�roughly�5km/h�up�to�a
maximum�speed�of�80km/h.�If�there�is�still�no�response�from�the�driver�in�this�speed�range�after�an
acute�warning�is�issued,�the�vehicle�is�decelerated�at�a�maximum�rate�of�4m/s².
Example�of�vehicle�identification�by�KAFAS�camera
Index Explanation
1 Vehicle�in�same�lane
2 Vehicle�in�different�lane
The�duration�of�the�brake�intervention�is�limited�to�approximately�1.5seconds.�Additional�dangers�for
the�traffic�behind�are�therefore�avoided.