The heart of the VDC system is a sensor
that originates from the field of aeronau-
tics, which detects rotations of the car
around its vertical axis. The centrifugal
forces generated when the car runs on a
bend are detected by a highly sensitive,
lateral acceleration sensor.
The corrective actions are changed and
controlled continuously until the car re-
turns to the required course.
ASR FUNCTION (ANTISLIP
REGULATION): GENERAL
The ASR system integrates the VDC sys-
tem controlling the vehicle drive and com-
ing into operation automatically each
time one or both driving wheels skid.
The action of the VDC system consider-
ably increases the active safety of the ve-
hicle under many critical situations and it
is particularly useful also when the road
surface grip conditions change.
Two different control systems are acti-
vated, depending on the skidding condi-
tions:
The stabilising action of the VDC system
is based on calculations made by the
system’s electronic control unit which
processes the signals received from the
steering wheel rotation, lateral accelera-
tion and individual wheel rotation sen-
sors. These signals allow the control unit
to recognise the manoeuvre the driver in-
tends to do when turning the steering
wheel.
– If skidding concerns both driving
wheels, because it is caused by the exces-
sive power transmitted, the ASR system
cuts in reducing the power transmitted by
the engine.
WARNING
For the VDC, ASR and
ABS systems to work
correctly, the tyres must be of the
same brand and type on all
wheels, in perfect conditions and
above all of the specified type,
brand and size.
–
If skidding concerns only one driving
wheel, the ASR system cuts in automati-
cally braking the skidding wheel, with an
effect similar to that of a self-locking dif-
ferential.
The control unit processes the informa-
tion received from the sensors and is
therefore capable of detecting the posi-
tion of the car and comparing it with the
trajectory the driver would like to follow
instant by instant. In the event of a dis-
crepancy, the control unit chooses and
commands the most suitable action to
bring the car back to the required course
within a fraction of a second: braking one
or more wheels at a different braking
force and, if necessary it reduces the
power transmitted by the engine.
121
| Categories | Alfa Romeo 166 Manuals, Alfa Romeo Manuals |
|---|---|
| Tags | Alfa Romeo 166 2.0 T.SPARK, Alfa Romeo 166 2.5 V6 24V, Alfa Romeo 166 3.0 V6 24V, Alfa Romeo 166 3.2 V6 24V, Alfa Romeo 166 JTD |
| Model Year | 2003, 2004, 2005 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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