In the 7 series G11/G12, depending on the options fitted, various camera-based
systems are available. Technical implementation is released with camera in the
mirror base and control unit, the KAFAS control unit.
The most important display function of the camera-based driver assistance systems are as follow :
The most important display function of the camera-based driver assistance systems are as follow :
- · Lane departure warning
- · High-beam assistance (not permitted in Japan)
- · Speed limit (Speed limit info)
- · Collision warning
- · Overtaking ban
- · Urban traffic accident prevention
- · Preventive pedestrian protection
- · Traffic jam assistant
The following components for camera-based driver support
systems (KAFAS) are described :
·
Light operating unit, turn signal/high beam
switch
The high beam assistant is switch-ON and
OFF at the turn signal/high beam switch. To do this, the light switch must be
in the automatic driving lights control or low beam headlight position.
An additional prerequisite is that the low
beam headlights are switch ON due to sufficient dark. For vehicles without
automatic driving lights control, the high beam assistant can also be activated
for brightness. The high-beam assistant switches on the low beam headlights
based on the ambient brightness. The lane departure warning and collision warning
are switched ON and OFF using the button in the driver assistance system
operating facility. The driver assistance system operating is connected to the
BDC via Local interconnect network bus. A bus signal from the BDC to the KAFAS
control unit informs it that the button has been pressed. The central control
unit for all video-based functions is the optional equipment system control
unit (SAS).
The SAS control unit only allows the lane
departure warning to be switched ON if the system is operating trouble-free. Only
then is there positive confirmation by means of a bus signal to the Body Domain
Controller to activate the button function indicator light. If there is fault
in the system, the function indicator light remains switched off despite
keystroke. This allows the driver to see
that the lane departure warning is not available.
The driver assistance system operating
facility is located in the centre console by hazard warning button.
·
KAFAS control unit with stereo camera
The KAFAS control unit is now installed in
front of the roof function centre on the roof liner. The stereo camera is
integrated in the KAFAS control unit. The light spots, light colors and light intensities
picked up by the stereo camera are evaluated by the KAFAS control unit. The evaluation
by the KAFAS control unit results in switch on recommendation or switch off
recommendation. The stereo camera monitors the area in front of vehicle. The video
camera records the roadway up to approximately 40 meters in front of the
vehicle and up to approximately 5 meters to the right and left at the sides of
vehicle. The image data is evaluated by the KAFAS control unit. The stereo
camera has 2 lenses. This means that a three-dimensional image can be recorded.
The following elements are detected :
- Object (vehicles, pedestrians, generic objects)
- Free space in front of the vehicle
- Preview of the course of the road
- Road markings
- Road signs
