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158
ENGINEERING DETAILS
TRACTION CONTROL (DTC)
How does traction control
work?
Traction control compares the
front and rear wheel circum-
ferential velocities. The differ-
ential is used to compute slip
as a measure of the reserves
of stability available at the rear
wheel. If slip exceeds a cer-
tain limit, the engine manage-
ment system intervenes and
adapts engine torque accord-
ingly. Dynamic Traction Control
(DTC) takes bank angle into
consideration and on account
of this additional bank-angle
and acceleration data, its in-
tervention is more precise and
more comfortable for the rider.
BMW Motorrad DTC is de-
signed as an assistant system
for the rider and for use on
public roads. The extent to
which the rider affects DTC
control can be considerable
(weight shifts when cornering,
items of luggage loose on the
motorcycle), especially when
the style of riding takes rider
and machine close to the limits
imposed by physics.
Activate
Enduro
for off-roading. This mode
delays DTC intervention slightly
riding mode
in order to permit controlled
drifting.
The system is not optimised for
special requirements that ap-
ply under extreme competitive
conditions off-road or on the
track. The BMW Motorrad DTC
can be deactivated in these
cases.
WARNING
Risky riding
Risk of accident despite DTC
Invariably, the rider bears
responsibility for assessing
road and traffic conditions
and adopting his or her style
of riding accordingly.
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 acceler-
ate is restricted more and more
as the angle of heel increases.
Consequently, there can be a
perceptible reduction in accel-
eration out of very tight bends.
If the electronic processor
receives values for the bank
angle that it considers implaus-
ible over a lengthy period, a
dummy value is used for the
bank angle or the DTC function
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