Dynamic Traction Control; (Dtc) - BMW S 1000RR Rider's Manual

Dynamic Traction
9
Control (DTC)
166
How does Dynamic
Traction Control work?
DTC takes the vehicle tilt into
accounts, conveniently controls
it and is useful for improving lap
times on the racetrack.
The Dynamic Traction Control
system compares the speed of
rotation at the circumferences
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
z
a certain limit, the engine man-
agement system intervenes and
adapts engine torque accordingly.
DTC can only provide support
within the physical limits. The
physical limits are strongly de-
pendent on the road surface,
road temperatures, tyre choice
and tyre temperature. There is
the danger of overheating when
using unsuitable tyres on the
race track.
WARNING
Risky riding
Risk of accident despite DTC
Invariably, the rider bears re-
sponsibility for assessing road
and traffic conditions and ad-
opting 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 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.
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 iden-
tified as implausible over an ex-
tended period of time, a substi-
tute value is used for the lean
angle or the DTC is switched off.
Under these circumstances the
indicator for a DTC fault shows.
Self-diagnosis has to complete
before fault messages can be is-
sued.
The BMW Motorrad traction con-
trol may switch off automatically
under the exceptional riding con-
ditions outlined below.