Self-Study Programme 276 Phaeton automatic proximity control.pdf

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Service.
Self-Study Programme 276
The Phaeton
Automatic Proximity Control (APC)
Design and Function
If a driver attempts to activate the vehicle's cruise control system (CCS) in the heavy traffic scenario
shown below to cruise along in a relaxed manner, he will soon have to brake because of the frequently
changing distances to vehicles ahead.
The APC system has learned its lesson from bats. In much the same way as bats use ultrasonic waves to
find their way about their surroundings, the Automatic Distance Control (APC) scans the traffic situation
ahead of the vehicle by means of millimetre wave radar and controls the distance to the vehicle ahead
on the basis of this data.
The CCS can be expanded to include a proximity-maintaining function which allows comfortable and
stress-free driving even in heavy traffic.
S276_034
NEW
Important
Note
This Self-Study Programme explains the design
and function of new developments. The contents
will not be updated.
Please refer to the relevant Service Literature for current inspection,
adjustment and repair instructions.
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Table of contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Functional limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
System overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Components of the APC system . . . . . . . . . . . . . . . . . . . . . 12
Multi-function steering wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
APC display in the dash panel insert. . . . . . . . . . . . . . . . . . . . . . .15
Accelerator, brake pedal and selector lever. . . . . . . . . . . . . . . . 19
Proximity control sender G 259 . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Brake servo control unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Anti-theft alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Electronic brake servo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Data flow in the CAN network . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Calibrating the proximity control sender. . . . . . . . . . . . . . . . . . . 30
Measuring method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Correcting an indication error . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
System safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Terms in italics are explained here . . . . . . . . . . . . . . . . . . . 36
Test your knowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
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Introduction
Overview
APC
The Automatic Proximity Control system is an
expansion of the conventional cruise control
system (CCS). The CCS adjusts the speed of the
vehicle to a value preset by the driver.
Dash panel insert with 5‘‘ colour screen
The APC system implements this convenience
function in the same way. In addition, the
vehicle's road speed is adapted to the speed of
any vehicle driving ahead if the latter is moving
more slowly than one's own vehicle.
Brake servo control unit
Proximity control sender
Electronic brake servo
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Automatic Proximity Control is a
driver assistance
system
designed for enhanced convenience.
It relieves the strain on the driver while driving
and thus contributes to active safety.
S276_056
Multi-function steering wheel
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