Automatic Stability
Control (ASC)
with Automatic Stability Control
(ASC)
OE
How does ASC work?
The BMW Motorrad ASC com-
pares the wheel speeds of the
front and rear wheels. From the
speed difference the slip, and
with it the stability reserves on
the rear wheel are determined.
When a slip limit is exceeded, the
engine torque is adapted by the
engine management system.
What are the design
characteristics of the
BMW Motorrad ASC?
The BMW Motorrad ASC is an
assistance system for the rider
and is designed for driving on
public roads. Especially at the
limits of physics, the rider has
a considerable influence on the
extent of the control that ASC
can provide (shifting weight in
curves, loose loads).
The system is not optimized for
special requirements resulting
under extreme weather condi-
tions offroad or on the racetrack.
The BMW Motorrad ASC can be
deactivated for these cases.
WARNING
Risky riding style
Accident hazard despite ASC
The rider is always responsi-
ble for adapting his/her driving
style.
Do not reduce the system's ex-
tra safety margin with careless
riding or unnecessary risks.
Special situations
As lean angles increase, accel-
eration potential is also progres-
sively restricted by the laws of
physics. This can result in de-
layed acceleration when exiting
very tight curves.
The system compares the rota-
tion speeds of the front and rear
wheels to detect any tendency
for the rear wheel to spin or lose
traction. If the system registers
implausible data for an extended
period of time it will deactivate
the ASC functionality as safety
precaution and a display will alert
you to an ASC error. A self-diag-
nosis routine must be completed
before the error will be displayed.
In the following unusual driving
conditions, the BMW Motorrad
ASC may be turned off automati-
cally.
Unusual riding conditions:
Driving on the rear wheel
(wheelie) for a longer period
with ASC deactivated.
Rear wheel spinning in place
with front brake engaged (burn
out).
8
88
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Technology in detail
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