SSP 389 ParkAssist VW.pdf

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Service Training
Self-study Programme 389
ParkAssist
Design and function
Driver assist systems are developed to relieve the
burden on drivers due to the increasingly dense traffic
and the flood of information that they have to deal
with. These aids support drivers in certain driving
situations or take over driving procedures either
completely or partly.
As computer performance rises and the production
costs of electronic components fall, it is not surprising
that Volkswagen is offering an increasing number of
more powerful assist systems.
The new ParkAssist from Volkswagen is one example
of the increased capability of assistance systems.
ParkAssist actively helps the driver when reversing
into parallel parking spaces.
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NEW
Warning
Note
The self-study programme shows 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.
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Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Overview of system components and their locations . . . . . . . . . . . . . . . . . . . 6
System schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electromechanical power steering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Function of ParkAssist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Parking procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Overview of activation conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Abort criteria and system messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Electrical components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
System control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Functional diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Test Yourself . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
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Overview
ParkAssist from Volkswagen
This assist system is an active helper when you reverse
into parking spaces. This development is based on the
park distance control system that uses ultrasound
sensors and an acoustic warning to help the driver
judge the distance from other parked cars or
obstacles.
Further development stages for this kind of driver
assist system are, for example, the reversing camera
and the optical parking system that not only detects
an obstacle in front of or behind the vehicle, but also
obstacles position in the scanning area. In all these
systems, the vehicle is still steered by the driver.
However these systems simply help the driver judge
and determine the area around the vehicle.
ParkAssist not only includes this surround scan, it also
automatically controls the steering while the car is
reversed into the parking space. The driver simply
operates the accelerator, clutch and brake pedals.
The driver can, however, take over control of the
steering at any time and end the automatic parking
procedure.
The system can reverse into parking spaces on both
the right-hand and left-hand side of the road,
for example on one-way streets.
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Important note
ParkAssist cannot replace the driver's attentiveness.
The drivers are still legally responsible for their vehicle. If they notices a risk that pedestrians, other
vehicles or objects could be damaged or if they are uncertain of the risk, they will need to react
accordingly and stop the vehicle ending the function.
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System requirements
A vehicle equipped with ParkAssist has the following technical requirements:
- electromechanical power steering.
- an ESP brake system.
Distinguishing between the park distance control and parking steering function
ParkAssist has two functions:
- The PDC park distance control system that is also known as the parking aid system.
- the parking steering function for the active parking process.
PDC park distance control system
PDC uses four ultrasound sensors at the front and four
at the rear to measure the distance from objects in
front of and behind the vehicle. If the vehicle reaches
a specific distance from this object, there is an
acoustic warning.
If the vehicle is only equipped with the parking aid,
the parking aid control unit J446 will control the PDC
function.
It is normally fitted in the boot.
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If a vehicle is already equipped with a
PDC system, it will not normally be possible
to retrofit the parking steering function.
Parking steering function
In addition to the PDC sensors, the ParkAssist system
also has an ultrasound sensor on each side of the
vehicle at the front to search the areas alongside the
vehicle for a parking space.
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