BMW G12 Product Information page 27

G12￿Driver￿Assistance￿Systems
7.￿Collision￿Warning
7.1.2.￿Pedestrian￿warning￿with￿city￿braking￿function
The￿pedestrian￿warning￿with￿city￿braking￿function￿(Daytime￿pedestrian￿detection￿OE￿ZN2)￿is￿designed
to￿prevent￿possible￿collisions￿with￿pedestrians￿in￿urban￿areas￿or￿reduce￿the￿effects￿of￿an￿accident.￿The
system￿warns￿of￿a￿possible￿collision￿with￿pedestrians￿from￿a￿speed￿of￿approximately￿10 km/h￿up￿to￿a
maximum￿speed￿of￿60 km/h￿and￿assists￿the￿driver￿with￿a￿brake￿intervention￿shortly￿before￿a￿collision.
The￿KAFAS￿stereo￿camera￿captures￿the￿scene￿in￿front￿of￿the￿vehicle￿and￿detects￿pedestrians￿in￿the
field￿of￿view￿using￿image￿processing.
Example￿of￿person￿recognition￿by￿KAFAS￿camera
Based￿on￿the￿calculated￿positions,￿distances￿and￿the￿movement￿of￿the￿detected￿pedestrians,￿an￿acute
warning￿is￿issued￿in￿critical￿situations.￿An￿early￿warning￿is￿not￿available￿for￿the￿pedestrian￿warning￿with
city￿braking￿function￿(OE￿ZN2).
With￿an￿acute￿warning￿the￿vehicle￿is￿decelerated￿by￿roughly￿4 m/s².￿The￿duration￿of￿the￿brake
intervention￿is￿limited￿to￿approximately￿1.5 seconds.￿Additional￿dangers￿for￿the￿traffic￿behind￿are
therefore￿avoided.
7.2.￿Warning￿and￿braking￿function
The￿operating￿principle￿of￿the￿collision￿warning￿is￿based￿on￿a￿detection￿and￿warning￿algorithm.
Machine￿vision￿detects￿pedestrians￿and￿vehicles￿in￿the￿detection￿range￿of￿the￿camera.￿If￿there￿is￿a
risk￿of￿a￿collision,￿a￿warning￿symbol￿is￿shown￿in￿the￿instrument￿cluster￿(KOMBI),￿or￿in￿the￿Head-Up
Display￿for￿vehicles￿with￿the￿Head-Up￿Display￿standard￿equipment￿(OE 610).￿The￿warning￿function￿is
divided￿into￿two￿stages.￿The￿next￿probable￿movement￿of￿an￿object￿is￿determined￿based￿on￿the￿current
movement￿of￿the￿detected￿object￿and,￿taking￿into￿account￿the￿movement￿of￿the￿object,￿a￿collision
risk￿is￿identified.￿If￿a￿situation￿is￿evaluated￿as￿critical￿by￿the￿warning￿algorithm,￿a￿warning￿is￿issued￿and
braking￿is￿introduced￿based￿on￿a￿multistage￿warning￿concept.￿The￿warnings￿and￿brake￿interventions
differ￿for￿pedestrians￿and￿vehicles.
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