Self-Study Programme 462 Audi A8 '10 night vision assist.pdf

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Self-Study Programme 462
Audi A8 ’10
Night Vision Assist
Audi
Service Training
Introduction
Recent years have seen many innovations in the field of automo-
tive driver assistance systems.
Driver assistance systems aid drivers by providing comfort and
safety, but without relieving them of the responsibility for their
own actions. They are one of the reasons for the decline in the
number of fatalities resulting from road accidents, despite the
ever-increasing number of road users. Many of these systems help
to prevent accidents by alerting the driver to impending hazards.
Night Vision Assist,
the latest driver assistance system by Audi,
has been designed to specifically meet this challenge.
In the dark, Night Vision Assist enables the driver to detect per-
sons ahead of the vehicle much sooner than without it.
The advantage of early detection is that the driver has more time
to react to the hazardous situation ahead.
Animals can also be seen on the display even before they come
within the range of the vehicle's headlights. The night vision sys-
tem is, therefore, a real advancement. It not only provides better
illumination of the road, but also allows the situation ahead of the
vehicle to be interpreted more quickly and accurately in the dark.
Its range greatly exceeds that of the main-beam headlights. The
function has been implemented using a thermal imaging camera,
which means that heat-emitting objects, such as human beings
and animals, stand out clearly against their background.
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The above illustration clearly demonstrates the advantages of the
Night Vision Assist system for drivers. The pedestrian crossing the
road can only be vaguely discerned through the windscreen. A
quick glance at the Night Vision Assist display, however, reveals
the pedestrian in full size.
The brightly coloured pedestrian clearly stands out against the
background and is bracketed in red to alert the driver to the dan-
ger of a collision. By detecting the pedestrian sooner, the driver
has more time to react appropriately to the hazardous situation
ahead.
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Contents
How Night Vision Assist works
Reasons for introducing Night Vision Assist ______________________________________________________________________________ 4
Functional description ______________________________________________________________________________________________________ 5
Range of Night Vision Assist________________________________________________________________________________________________ 6
Information on driver responsibility _______________________________________________________________________________________ 6
Function: marking of detected pedestrians _______________________________________________________________________________ 7
Function: driver hazard warning of Night Vision Assist __________________________________________________________________ 9
System operation and displays
Switching on Night Vision Assist ________________________________________________________________________________________
Switching off Night Vision Assist ________________________________________________________________________________________
Night Vision Assist icon on taskbar ______________________________________________________________________________________
Indication of deactivated functions______________________________________________________________________________________
Adjustment options on the MMI terminal ______________________________________________________________________________
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System components
Night vision system control unit J853 ___________________________________________________________________________________
Installation location of Night Vision Assist control unit_______________________________________________________________
Component protection system of Night Vision Assist control unit ___________________________________________________
Night vision system camera R212 _______________________________________________________________________________________
Camera shutter heater ____________________________________________________________________________________________________
Installation location of Night Vision Assist camera ____________________________________________________________________
Camera range ______________________________________________________________________________________________________________
Mechanism for protection against misuse of thermal imaging camera______________________________________________
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System overview
Electrical implementation of the function ______________________________________________________________________________ 16
Communication structure_________________________________________________________________________________________________ 17
Diagnostic functions and system calibration
Data blocks _________________________________________________________________________________________________________________
Adaptions___________________________________________________________________________________________________________________
Actuator diagnostics ______________________________________________________________________________________________________
System calibration _________________________________________________________________________________________________________
Dynamic calibration _______________________________________________________________________________________________________
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The Self-Study Programme teaches the basics of the design and function of new models, automotive com-
ponents or technologies.
It is not a Repair Manual. Figures given are for guidance purposes only and refer to the software version
valid at the time of preparation of the SSP.
For further information about maintenance and repair work, always refer to the current technical literature.
!
Note
Reference
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How Night Vision Assist works
Reasons for introducing Night Vision Assist
Even a cursory glance at accident statistics reveals that persons
driving at night are particularly at risk of accident. Although night-
time traffic accounts for only 25% of overall daily traffic volume,
about half of all fatal road accidents occur at night.
Hence, the risk of accident is twice as high as that during daylight
hours . Every year, more than half a million people throughout
Europe are injured in night-time road accidents, more than 20,000
fatally.
The reasons for this high incidence of night-time accidents are easy
to see:
• Bad or impaired visibility on country roads
• Obstacles or tight corners being detected too late with the head-
lights on dipped beam
• Misjudgement of speeds and distances due to a lack of visual
points of reference
• Dazzling of drivers by the headlights of oncoming traffic
• Driving at speeds inappropriate to the conditions
Pedestrians and cyclists are particularly at risk and frequently
involved in night-time road accidents. With conventional lighting
technology, it is difficult for drivers to detect and react appropri-
ately to darkly clad joggers and badly illuminated cyclists, for
example.
This is especially the case when they are outside the range of the
headlight beam.
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Functional description
The new Audi A8 ’10 is the first vehicle by Audi to be equipped with
Night Vision Assist, a driver assistance system that enables the
driver to spot potential hazards more quickly at night. The system
produces a thermal image of the area ahead of the vehicle on the
multi-functional display. An infrared camera built into the Audi
rings at the front end of the vehicle is used to capture these
images.
Because of the heat they give off, human beings and animals show
up much more brightly in the image than their surroundings and,
therefore, are easy for the driver to spot on the display. If the sys-
tem classifies an object as a human being, the object in question is
additionally marked in colour. The thermal image shows not only
living beings, but also the road ahead of the vehicle and the out-
line of buildings.
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The thermal image is further analysed by the night vision system
control unit. From the images captured, the system predicts the
next direction of movement of detected pedestrians. Actual vehi-
cle speed and yaw rate are factored in to predict the next move-
ments of the vehicle.
If a danger of collision is computed on the basis of these two pre-
dictions, an acoustic warning signal will be given so that the driver
can react to the situation. However, Night Vision Assist does not
itself intervene in road traffic situations.
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