momentum take over and even
BMW Motorrad ABS is unable to
counteract their effects.
Electronic engine
management with
BMW Motorrad ASC
with Automatic Stability Control
(ASC)
OE
How does ASC work?
The BMW Motorrad ASC system
compares the speed of rotation
of the front wheel and the rear
wheel. The differential is used to
compute slip as a measure of the
reserves of stability available at
the rear wheel. If slip exceeds a
certain limit the engine control in-
tervenes, adapting engine torque
accordingly.
What is the design
baseline for
BMW Motorrad ASC?
BMW Motorrad ASC is designed
as an assistant system for the
rider and for use on public roads.
The extent to which the rider af-
fects the ASC can be consider-
able (weight shifts when corner-
ing, items of luggage loose on
the motorcycle), especially when
style of riding takes rider and ma-
chine close to the limits imposed
by physics.
The system is not optimised for
special requirements that apply
under extreme competitive situ-
ations off-road or on the track.
You have the option of deactiv-
ating the BMW Motorrad ASC
system for these circumstances.
Even ASC is constrained by
the laws of physics. Invari-
ably, the rider bears responsibil-
ity for assessing road and traffic
conditions and adopting his or
her style of riding accordingly.
Do not take risks that would neg-
ate the additional safety offered
by this system.
Special situations
In accordance with the laws of
physics, the ability to accelerate
is restricted more and more as
the angle of heel increases. Con-
sequently, there can be a per-
ceptible lag in acceleration out of
very tight bends.
The speeds of the front and
rear wheels are compared as
one means of detecting the rear
wheel's incipient tendency to
spin or slip sideways. If the sys-
tem registers implausible values
for a lengthy period the ASC
function is deactivated for safety
reasons and an ASC fault mes-
sage is issued. Self-diagnosis
7
77
z
Engineering details
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