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Electronic engine
management with
BMW Motorrad ASC
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
intervenes and adapts the engine
torque accordingly.
What is the design
baseline for
BMW Motorrad ASC?
BMW Motorrad ASC is an assist-
ant system for the rider for use
on public roads. The extent to
which the rider affects ASC con-
trol can be considerable (weight
shifts when cornering, items of
luggage loose on the motor-
cycle), especially when style of
riding takes rider and machine
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 race
course. The BMW Motorrad
ASC can be deactivated in these
cases.
WARNING
Risky riding.
Risk of accident despite ASC.
Invariably, it remains the rider's
responsibility to adapt riding
style to riding conditions.
Do not take risks that would
negate 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 reduction 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
has to complete before fault
messages can be issued.
The following exceptional
riding conditions can lead to
an automatic shutdown of the
BMW Motorrad ASC:
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