BMW G12 - Page 29

G12�Driver�Assistance�Systems
7.�Collision�Warning
23
If�the�vehicle�is�approaching�the�vehicle�driving�ahead�or�a�pedestrian�at�a�very�low�speed,�an�acute
warning�is�not�issued�even�when�the�distance�is�very�small.�This�intentional�driving�situation�only
triggers�the�early�warning.�This�way�there�are�fewer�meaningless�and�annoying�acute�warnings�issued
by�the�system.
The�acute�warning�cannot�be�deactivated�separately.�The�timing�of�the�acute�warning�also�cannot�be
adjusted.�If�the�acute�warning�is�not�to�be�issued,�the�"collision�warning"�front�protective�function�must
be�deactivated.
If�an�acute�warning�is�issued,�this�is�indicated�to�the�driver�by�a�red�flashing�vehicle�symbol�or�a�red
flashing�person�symbol�in�the�instrument�cluster�(KOMBI)�or�Head-Up�Display.�In�addition,�an�acoustic
warning�signal�is�sounded.
The�acute�warning�for�pedestrians�is�issued�within�a�speed�range�of�approximately�10km/h�to�60km/h.
The�acute�warning�for�vehicles�is�issued�at�speeds�above�approximately�5km/h.
When�the�acute�warning�is�issued,�the�brake�system�is�also�preconditioned�in�order�to�achieve�quicker
and�sharper�deceleration.�With�these�measures�the�driver�also�receives�specific�support�at�the�same
time�as�the�warning�in�order�to�be�able�to�respond�effectively.
The�acute�warning�does�not�relieve�the�driver�of�his�responsibility�to�adapt�the�speed�and�driving�style
to�the�traffic�conditions.
7.2.4.�Brake�intervention
With�the�camera�based,�collision�warning�w/�city�collision�mitigation�(OE�ZN3�included�with�OE�5AS);
If�the�driver�no�longer�has�the�option�to�avoid�the�accident�with�his�own�response,�automatic�brake
intervention�is�effected�as�a�last�step.�The�brake�intervention�is�effected�at�a�brake�force�of�about�4m/
s²�(camera�based)�and�can�have�the�effect�of�avoiding�a�collision�up�to�a�differential�speed�of�about
18km/h.�At�higher�differential�speeds�the�impact�speed�is�reduced�by�a�smaller�amount.�Just�like�the
driver�can�support�the�effect�of�the�system,�he�also�has�the�option�of�overriding�and�thus�cancelling
the�automatic�panic�braking�at�any�time�with�a�steering�wheel�movement�(avoidance�maneuver),�by
accelerating�or�with�a�sharp�brake�intervention.
With�the�camera�and�radar�based,�collision�warning�system�(included�with�OE�5AT);�If�the�driver�no
longer�has�the�option�to�avoid�the�accident�with�his�own�response,�automatic�brake�intervention�is
effected�as�a�last�step.�The�brake�intervention�is�effected�at�a�brake�force�of�about�8m/s²�(camera/radar
based)�and�can�have�the�effect�of�avoiding�a�collision�up�to�a�differential�speed�(delta)�of�about�30km/
h.
Therefore,�both�systems�can�bring�car�to�a�stop,�the�difference�is�that�you�are�more�likely�to�see�this
happen�in�a�5AT�car�then�a�5AS�car.�This�is�why�5AS�is�referred�to�as�“city�collision�MITIGATION”
because�this�is�the�more�likely�use�case�as�opposed�to�“AVOIDANCE”�with�5AT.
The�brake�intervention�is�effected�for�pedestrians�in�the�speed�range�between�10�and�60km/h�and�for
vehicles�in�the�speed�range�between�5�and�60km/h.
For�a�brake�intervention�to�be�possible,�the�Dynamic�Stability�Control�(DSC)�must�be�switched�on.