74
Operating principle
High-precision sensors monitor
wheel rotating speeds. If differences
are detected, the system interprets
them as a sign that wheelspin is about
to set in, and reduces the power input
from the engine accordingly. If neces-
sary, the rear wheel brakes are also
applied momentarily to suppress
wheelspin.
Although the action of this system
may seem to be restricting available
engine power and therefore be diffi-
cult for the driver to accept, it should
be remembered that as much traction
as can be achieved, and therefore
optimum acceleration, are always
available for the prevailing road,
driving and climatic conditions,
without exceeding the limits of
dynamic stability.
aEven with ASC+T, the basic laws
of physics continue to apply. If the
maximum possible speed in any given
situation is exceeded, traction and lat-
eral wheel location may be lacking.
The driver alone is responsible for
avoiding this situation. The additional
safety potential offered by this stability
and traction control system must
never be understood as an invitation
to take additional risks.c
The system may react adversely if
tyres of different makes and types are
used on the same car. You should
therefore try to ensure that all the
car's tyres are identical in make, type
and tread pattern.
By switching off ASC+T it is possible
to revert to the conventional driveline
(without electronic control). It may be
desirable, for instance, to switch off
the system to ensure maximum poten-
tial traction
d If the car has to be rocked out of a
hollow on a soft surface, or started
in deep snow or on a loose sur-
face.
d if snow chains are fitted.
BMW 840Ci, 850Ci
Dynamic Stability Control (DSC) is an
extended form of Automatic Stability
Control plus Traction (ASC+T).
It improves dynamic stability, particu-
larly where lateral forces are encoun-
tered (e. g. cornering) and when
accelerating.
It identifies and counteracts unstable
driving situations and prevents the
driven wheels from spinning in poor-
grip or otherwise unfavourable condi-
tions (slippery surfaces, bends).
312de130
ASC+T DSC
Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG
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