BMW Motorrad R 1250 GS 2020, Rider'S Manual

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158 TECHNOLOGY IN DETAIL
Releasing the brake when
switching off the engine or
during timeout
Hill Start Control is deactivated
when the engine is switched
off using the emergency-off
switch, when the side stand is
folded out, or after it times out
(10 minutes).
In addition to the indicator and
warning lights, the rider is to
be made aware about the de-
activation of the Hill Start Con-
trol by the following behavior:
Brake warning jerk
The brake is released briefly
and is immediately reacti-
vated.
This causes a jerking behavior
that the driver can feel.
The partial integral ABS brake
system sets a speed of ap-
prox. 1-2 km/h.
The driver must brake the ve-
hicle manually.
After two minutes, or when
the brake is applied, Hill Start
Control is deactivated com-
pletely.
When the ignition
is switched off, the
holding pressure is built up
immediately and without brake
warning jerk.
SHIFTCAM
Principle of ShiftCam function
The motorcycle is equipped
with the BMW ShiftCam tech-
nology - a technique for vary-
ing the valve timing and the
valve stroke on the intake side.
The centerpiece of this technol-
ogy is a one-piece intake trip
camshaft that has two cams
per valve to be actuated: one
for partial load and one for full
load. The partial load cam has
been developed with regard
to fuel economy optimization
and smooth running. The par-
tial load cam reduces both the
valve timings adapted for this
purpose and the intake valve
stroke. Furthermore, the intake
cams for the left and right in-
take valve differ in stroke and
angle position when the par-
tial load cam is activated. This
causes a staggered opening of
the two intake valves, which
have different widths. The ad-
vantage is that the fuel-air mix-
ture flowing into the combus-
tion chamber is more strongly
swirled and more effectively
burned. Overall, this results in
optimal fuel efficiency and no-
ticeably improves the smooth-
ness of running. The full load
cam is optimized for perfor-