Multifunction Camera, Component Description - GF54.21-P-3300FR
Model 257, 290
up to model year 2021
with code 22P (Lane tracking package)
Model 257, 290
up to model year 2021
with code 23P (Drive package)
Model 257, 290
up to model year 2021
with code 513 (Road sign recognition system)
Model 257, 290
up to model year 2021
with code P20 (Driving assistant package Plus)
Model 257, 290
up to model year 2021
with code P35 (Light Package)
Shown on model 257
Shown on model 257
Location
The mono multifunction camera and the stereo multifunction camera is positioned under a panel at the top center of the windshield.
Tasks
Mono multifunction camera:
The mono multifunction camera records information on the surroundings in the area to the front of the vehicle, e.g. ambient brightness, objects or traffic signs. These are evaluated by the integrated control unit, and used for implementing various functions.
Stereo multifunction camera:
The stereo multifunction camera consists of two high resolution camera heads that are mounted at a distance of approx. 20 cm apart in a housing. While the mono multifunction camera only estimates the distances to objects, the stereo multifunction camera can measure the distance to an object and its height above the road. This is made possible by the differences in perspective between the left and the right optical path. The electronic evaluation circuit in the stereo multifunction camera uses the same effect that enables people to have stereoscopic vision, this refers to the parallax or displacement between two images. At an average distance of 20 to 30 m the stereo multifunction camera can determine the exact distance to the object down to 20 to 30 cm. This high resolution is also available under more difficult conditions such as when multiple objects are situated very close to each other, when objects are partially concealed or when there is a low contrast between the object and the background. The electronic analysis system of the stereo multifunction camera is also able to differentiate between shadow and road markings and real objects. Along with the spatial position of a detected object, the stereo multifunction camera also provides decisive additional information: For each pixel of a detected object, a direction of motion can be determined on the horizontal, vertical and longitudinal axes (longitudinal axis of an object). This then clearly shows whether an object is moving and if so, where to. In combination with object classification (e.g. pedestrian) based on common features, it is possible to achieve a high degree of decision-making reliability. For example, the exact impact location for a collision can be calculated which in turn enables the time remaining until the point of impact to be used to maximum effect for safety precautions. The stereo multifunction camera supports this process over the entire vehicle speed range.
This results in the following tasks:
- Reading in of signals
- Evaluation of input factors
- Control and support of functions
- Actuation of components
- Transmission of signals and requests
Reading in of signals
The input factors are read in via the following connection:
- Periphery CAN (CAN PER) (mono multifunction camera)
- Suspension FlexRay (Flex E) (Stereo multifunction camera)
Periphery CAN (mono multifunction camera)
The mono multifunction camera also reads in the following signals over the periphery CAN:
- Terminal status of terminal 15
- Engine running or drive train operational
- Wheel speed
- Vehicle speed
- Vehicle lateral and longitudinal acceleration
- Information indicating driver activity, such as turn signaling, accelerating, braking, steering
- Information indicating possible distraction of the driver, such as operation of the audio system, various comfort functions (interior illumination, steering column adjustment) and various menu levels in the instrument cluster (A1) and in the head unit (A26/17)
Suspension FlexRay (Stereo multifunction camera)
The stereo multifunction camera also reads in the following signals over the suspension FlexRay:
- Terminal status of terminal 15
- Engine running or drive train operational
- Wheel speed
- Vehicle speed
- Vehicle lateral and longitudinal acceleration
- Information on brake control system activities
- Information indicating driver activity, such as turn signaling, accelerating, braking, steering
- Information indicating possible distraction of the driver, such as operation of the audio system, various comfort functions (interior illumination, steering column adjustment) and various menu levels in the instrument cluster and in the head unit
Evaluation of input factors
The input factors are evaluated by the microprocessor and the corresponding components are actuated.
Control and support of functions
The mono multifunction camera controls the following functions:
- Lane Keeping Assist (with code 243 (Active Lane Keeping Assist))
- Traffic Sign Assist (with CODE 513 (Traffic Sign Assist))
- High beams assistant (with code P35 (Light package))
The stereo multifunction camera controls the following functions:
- Traffic Sign Assist (with CODE 513 (Traffic Sign Assist))
- High beams assistant (with code P35 (Light package))
The stereo multifunction camera supports the following driver assistance systems (with code 23P (Driving Assistance Package) or code P20 (Driving Assistance Plus Package)):
- Active Lane Keeping Assist
- DISTRONIC Distance-Pilot
- Steering-Pilot
- Evasive Steering Assist
- Active Brake Assist with intersection function
Model 257, 290
up to model year 2021
with code P35 (Light Package)
The respective multifunction camera evaluates light sources in front of the vehicle. In the stereo multifunction camera, evaluation takes place via the right camera head.
Actuation of components
To avoid any fogging in the multifunction camera's field of view the front window is heated in this area by the auxiliary heater heating element (R50). The auxiliary heater heating element is directly actuated by the multifunction camera.
Transmission of signals and requests
The multifunction camera sends status information and requirements over the following connection:
- Periphery CAN (mono multifunction camera)
- Suspension FlexRay (Stereo multifunction camera)
Periphery CAN (mono multifunction camera)
The mono multifunction camera also sends the following signals and requests:
- Ambient brightness
- Trigger vibrations at steering wheel (with code 243 (Active Lane Keeping Assist))
- Actuate high beams assistant and perform optical headlamp range adjustment (with code P35 (Light package))
- Display traffic sign (with CODE 513 (Traffic Sign Assist))
Suspension FlexRay (Stereo multifunction camera)
The stereo multifunction camera also sends the following signals and requests:
- Ambient brightness
- Trigger vibrations at steering wheel (with code 238 (Active Lane Keeping Assist))
- Actuate high beams assistant and perform optical headlamp range adjustment (with code P35 (Light package))
- Display traffic sign (with CODE 513 (Traffic Sign Assist))
- Lane data
- Object data (object size, object type, object direction of motion, distance)
Structure
The multifunction camera consists of the following main components:
- Camera head (mono multifunction camera)
- Left and right camera head (stereo multifunction camera)
- Electronic analysis system (control unit)
- Auxiliary heater heating element
After replacement of a multifunction camera or the windshield the corresponding multifunction camera has to be recalibrated.
Variants
- Mono multifunction camera with horizontal detection angle of 34° (except code 513 (Traffic Sign Assist))
- Mono multifunction camera with horizontal detection angle of 46° (with code 513 (Traffic Sign Assist))
| Wiring diagram for mono multifunction camera | PE54.21-P-2129-97XBA | ||
| Wiring diagram for stereo multifunction camera | PE54.21-P-2129-97XBB |