BMW R 1200 RT Service Manual download pdf (Page 99)

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 ASC control can be consid-

erable (weight shifts when cor-

nering, items of luggage loose

on the motorcycle), especially

when style of riding takes rider

and machine close to the limits

imposed by physics. The system

is not optimised for special re-

quirements that apply under ex-

treme competitive situations off-

road or on the track. You have

the option of deactivating 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-diagnos-

is has to complete before fault

messages can be issued.

The BMW Motorrad ASC can

shut down automatically under

the exceptional riding conditions

outlined below.

Exceptional riding

conditions:

Riding for a lengthy period with

the front wheel lifted off the

ground (wheelie) and ASC de-

activated.

Rear wheel rotating with the

motorcycle held stationary by

applying the front brake (burn-

out).

Heating up with the motorcycle

on the centre stand or an auxil-

iary stand, engine idling or with

a gear engaged.

Accelerating the motorcycle to

a speed in excess of 10 km/h

after switching the ignition off

and then on again reactivates the

ASC.

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Engineering details

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