Self-Study Programme 418 Lane departure warning system.pdf

Service Training

Self-study Programme 418

The Lane Departure Warning System

Design and Function

The lane departure warning system from Volkswagen is another progressive assistance system,

which is intended to provide the driver with support in controlling the vehicle in critical situations.

Based on the evaluation of optical data, it recognises the course of the road and actively intervenes with the

steering when the vehicle threatens to drive over the centre or outer lane markings.

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The self-study programme portrays the

design and function of

new developments!

The contents will not be updated.

For current testing, adjustment and

repair instructions,

refer to the relevant service literature.

NEW

Attention

Note

Contents

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Design of the lane departure warning system . . . . . . . . . . . . . . . . . . . . . . . . . 6

Overview of components and their locations . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

System layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Functional principle of the lane departure warning system . . . . . . . . . . . . . 10

System behaviour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Lane recognition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Functional limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

System messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Electrical components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Lane departure warning control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Further actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Functional diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Special tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

System calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

Explanation of the HIGHLIGHTED terms

Test yourself . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Overview

Driver assistance systems

Based on rapid developments in the field of

computer technology, the classic brake systems

such as for example the ABS system have been

developed into increasingly complex and functional

safety systems such as the ESP system.

The introduction of the electromechanical power

steering system and the electronic throttle opened up

further possibilities for directly and actively

intervening with the vehicle's driving behaviour,

further increasing driving safety and assisting the

driver in difficult driving manoeuvres.

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As these new functions provide the driver with

physical and mental support, they are now called

driver assistance systems.

In addition to the lane departure warning system from

Volkswagen, further systems such as

the Park Assist system with parking function,

the Adaptive Cruise Control system ACC or

the Lane Change Assist system are also available.

Important note

Despite the modern technologies and the possibilities which these offer in automotive engineering,

it is vital to remember that the driver of a vehicle still bears sole responsibility for their vehicle and its

behaviour.

Accidents as a result of excessive and inappropriate speeds, due to alcohol, drugs or fatigue cannot be

prevented or ruled out with the aid of electronic systems alone; in the final analysis, this can only be

achieved by eradicating the causes.

There are no grounds whatsoever for deriving reduced culpability or even legal rights from driver

assistance systems.

This must be made perfectly clear to all parties involved in sales and the core service process,

and must also be communicated to the customer in order to prevent false expectations.

The lane departure warning system from

Volkswagen

The lane departure warning system offers the

following:

The lane departure warning system

integrates functions into automotive technology which

were previously found only in the realm of living

beings or ambitious robotics research projects:

Recognition of the course of the road if

demarcation lines are present or the contrast

between the lane and the lane demarcations is

sufficiently high.

●

the optical perception of a situation

(seeing),

Provision of optical information to the driver on the

lane departure warning system's operating status.

●

the evaluation of this situation (thinking) and

the reaction to this situation (acting).

Execution of corrective or supporting steering

intervention.

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Operation of the lane departure warning system is

primarily intended for driving on motorways and

well-developed highways, as clear lane markings

and lane demarcations can be more easily

recognised on these.

However, use of the system within its performance

limits on rural or local roads is also basically possible.

Output of a perceptible warning vibration

to the driver if the lane departure warning

system's steering intervention is not sufficient to

correct lane departure.

●

Output of an optical and acoustic warning to the

driver if the steering wheel is released by the

driver in excess of a defined period of time

(no hands recognition).

●

In the following, we intend to familiarise you with the

technology required for this and the system behaviour

together with its possibilities and limits.

Suppression of system functions on intentionally

changing lanes, for example in the case of an

overtaking manoeuvre.

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