SSP 399 Electromechanical steering with parallel-axis drive.pdf

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Service Training
Self-study Programme 399
Electromechanical Steering with
Parallel-axis Drive
Design and Function
The electromechanical power steering has many
advantages compared with a hydraulic steering
system.
It assists the driver and relieves the physical and
mental burden for him. It works on demand, i.e. only
when the driver requires steering assistance.
The steering assistance depends on the vehicle speed,
the steering movement and the steering angle.
The parallel-axis power steering is part of the latest
generation of electromechanical steering systems.
This steering system uses a combination of tried and
tested components and innovative new features.
It is currently only used in left-hand-drive vehicles.
The electromechanical steering with parallel-axis
drive is a VW development from the Braunschweig
development team. It is also produced at the
Braunschweig site.
This self-study programme explains how this
electromechanical power steering with parallel-
axis drive works in detail.
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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
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
System overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Steering mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Steering electrics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Functional diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Test yourself . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
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Introduction
Overview of electromechanical steering with parallel-axis drive
The steering comprises the following components:
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-
-
-
-
-
-
-
Steering wheel
Steering column switch with steering angle sender G85
Steering column
Steering moment sender G269
Steering box (recirculating-ball gearbox)
Electromechanical power steering motor V187 (synchronous motor)
Power steering control unit J500
Universal joint shaft
Steering wheel
Steering column
Electromechanical
power steering motor V187
Universal joint shaft
Steering box
Steering moment sender G269
Power steering
control unit J500
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4
What you should know about the electromechanical power steering:
The electromechanical power steering does not
require a hydraulic system for steering assistance.
This steering system makes an important contribution
to environmental protection since no hydraulic fluid is
used.
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The electromechanical power steering is a steering
system with parallel-axis drive. It features a newly
developed steering box with a belt-driven
recirculating-ball gearbox that provides the steering
assistance.
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The electric motor is activated on demand to provide
steering assistance.
The system provides the driver with steering
assistance related to the driving conditions
(Servotronic).
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The steering is returned to the straight ahead
position by the “active return” function with assistance
from the electromechanical power steering.
This results in an acceptable return of the steering
wheel after cornering as well as more stable straight-
running.
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The straight-ahead driving correction
provides steering assistance to relieve the
driver on straight roads when there are constant
cross-winds or the road has excessive camber.
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