BMW On-Board Computer Wartungshandbuch PDF herunterladen (Seite 99)

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 accelerating ability

is restricted more and more as

the heel angle 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

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 rear wheel lifted off the

ground (wheelie) with ASC de-

activated.

Rear wheel rotating with the

vehicle held stationary by ap-

plying 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.

Slip can be increased by

very-heavy-duty massive-bar

tyres, with the result that ASC

intervention occurs before

optimum forward acceleration

is achieved. Under these

circumstances, BMW Motorrad

ASC should be deactivated.

If the front wheel lifts clear of the

ground under severe accelera-

tion, ASC reduces engine torque

until the front wheel regains con-

tact with the ground.

Under these circumstances,

BMW Motorrad recommends

rolling the throttle slightly closed

so as to restore stability with the

least possible delay.

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Engineering details

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