Self-Study Programme 225 EMPS.pdf

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Service.
Self-Study Programme 225
The electro-mechanical
power steering system
Design and Function
The electro-mechanical power steering system
assists the steering movement performed by the
driver by means of an electric motor. This motor,
in turn, drives a worm gear. The speed-depend-
ent steering system conveys a direct steering feel,
without any annoying feedback from the road to
the driver.
This Self-Study Programme explains this new
technology and the differences compared with
conventional hydraulic power steering systems.
The electro-mechanical power steering system is
currently fitted to the Lupo 3L TDI.
The
secret of the
electro-mechanical
power steering system
225_097
New
Important
Note
The Self-Study Programme explains the design
and function of new developments!
The contents of this SSP are not updated.
Please always refer to the relevant Service Literature
for all inspection, adjustment and repair instructions.
2
Table of contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
The steering mechanism . . . . . . . . . . . . . . . . . . . . . . . . 8
System overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
The electronics of the steering system . . . . . . . . . . . . 13
Functional description. . . . . . . . . . . . . . . . . . . . . . . . . 18
Function diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Test your knowledge . . . . . . . . . . . . . . . . . . . . . . . . . . .23
3
Introduction
The component parts of the steering
column
The main components of the new power steering
system are:
- the steering column switch,
- the steering column tube,
- the worm gear,
steering position sender, and
steering moment sender
- the electro-mechanical power steering motor,
- the steering column electronics control unit,
and
- the universal joint shaft to the mechanical
steering gear.
Steering column switch
Steering column tube
Worm gear
Steering column
electronics control unit
Electro-mechanical power
steering motor
Universal joint shaft
to mechanical steering gear
225_002
4
What you need to know about the
function of the electro-mechanical
power steering system:
1. The system offers the driver power-assisted
steering in dependence on actual driving
conditions
225_060
225_061
2. The steering movement of the driver is
transmitted to the worm gear and steering
gear via the steering shaft and an inter-
mediate spindle.
3. Self-alignment of the steering wheel in
the straight-ahead position is assisted by the
electro-mechanical power steering system.
225_062
4. The system conveys the feeling of contact with
the road to the driver.
225_063
5. The system monitors the input and output sig-
nals, as well as operation of the component
parts of the steering system.
225_066
6. The safety steering column is adjustable for
height, and incorporates the proven crash
concept pioneered in the Lupo.
225_065
7. It provides anti-theft protection through a lock
on the steering shaft.
225_064
5

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