Hill Start Control - BMW R 18 B 2021 Rider's Manual

116 TECHNOLOGY IN DETAIL
Function
A sensor located in each tire monitors the
air temperature and the tire pressure and
transmits this information to the control unit.
The sensors are equipped with a centrifu-
gal controller, which does not enable the
transmission of the measured values until
the minimum speed is exceeded for the first
time.
Minimum speed for the transmission
of the RDC measured values:
min 19 mph (min 30 km/h)
Before initial reception of the tire pressure,
is shown in the display for each tire. The
--
sensors continue to transmit the measured
readings for some time after the vehicle
comes to a stop.
Transmission time of the measured
values after vehicle standstill:
min 15 min
If an RDC control unit is installed but the
wheels have no sensors, a fault memory en-
try is generated.
Tire inflation pressure ranges
The RDC control unit distinguishes between
three inflation pressure ranges matched to
the motorcycle:
Tire pressure within the permissible toler-
ance.
Tire pressure at the limits of the permissi-
ble tolerance.
Tire pressure outside the permissible tol-
erance.
Temperature compensation
The tire pressure is temperature dependent,
i.e. it increases or decreases together with
the tire air temperature. The tire tempera-
ture is dependent on the outside tempera-
ture, the riding style and the length of the
journey.
The tire pressures are shown in the
multifunction display with tempera-
ture compensation and are always based
on the following tire air temperature:
68 °F (20 °C)
Tire pressure gages at gas stations do not
make any compensation for the air temper-
ature, the tire pressure indicated depends
on the temperature of the air in the tire. As
a result, in most cases the values displayed
there do not match the values shown in the
display.
Tire pressure adjustment
Compare the RDC value in the display with
the value on the back cover of the operat-
ing instructions. The difference between the
two values must be compensated with the
tire inflation pressure tester at the filling sta-
tion.
Example
According to the Operating Instructions,
the tire pressure should have the follow-
ing value:
36.3 psi (2.5 bar)
The following value is displayed in the
TFT display:
33.4 psi (2.3 bar)
The shortfall is thus:
2.9 psi (0.2 bar)
The tester at the filling station shows:
34.8 psi (2.4 bar)
To produce the correct tire pressure, this
must be increased to the following value:
37.7 psi (2.6 bar)

HILL START CONTROL

with Hill Start Control
Hill Start Control function
The Hill Start Control ride-off assistant func-
tion prevents uncontrolled rolling back on
slopes by means of targeted intervention in
the fully integral ABS brake system without
the rider having to continuously operate the
brake lever. When Hill Start Control is acti-
vated, pressure builds in the rear brake sys-
tem so that the motorcycle remains station-
ary on a sloping surface. The brake pressure
in the brake system depends on the gradi-
ent.
OE