BMW Motorrad R 1250RT, Rider'S Manual

Page: 188 / 379

182 ENGINEERING DETAILS
DYNAMIC TRACTION CON-
TROL (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 certain
limit, the engine management
system intervenes and adapts
engine torque accordingly.
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.
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.
With DTC, the speeds of the
front and rear wheels are
compared and the angle of
heel taken into account as one
means of detecting the rear
wheel's incipient tendency to
spin or slip sideways.
If the lean angle values are
identified as implausible over
an extended period of time,
a substitute value is used for
the lean angle or the DTC is
switched off. Under these cir-
cumstances the indicator for