Dynamic Engine Brake Control (Msr); Battery Guard - BMW Motorrad R 1300 GS Rider's Manual

178 ENGINEERING DETAILS
BMW Motorrad recommends
turning the throttle grip back
slightly when lifting the front
wheel in order to reach a stable
driving condition again as soon
as possible.
DYNAMIC ENGINE BRAKE
CONTROL (MSR)
How does dynamic engine
brake control work?
The purpose of dynamic en-
gine brake control is to prevent
the unstable riding states that
can be produced by excess-
ive engine braking moment
acting on the rear wheel. De-
pending on the road condition
and riding dynamic, excessive
braking torque can produce
a sharp rise in rear-wheel slip
and impair directional stability.
Dynamic engine brake control
limits this slip at the rear wheel
to a safe mode-dependent and
bank-angle-dependent regu-
lated slip.
Causes for excessive slip at
the rear wheel:
Riding with engine overrun
on a surface with a low coef-
ficient of friction (e.g. wet
leaves).
Rear-wheel hop when rider
downshifts.
Sharp braking during sporty
riding.
In the same way as DTC trac-
tion control, dynamic engine
brake control compares the
wheel circumferential velocities
of the front and rear wheels.
Additional information on the
bank angle enables dynamic
engine brake control to calcu-
late slip and the reserve of sta-
bility at the rear wheel.
If slip overshoots the applic-
able limit, the throttle valves are
opened very slightly to increase
engine torque. Slip is reduced
and the vehicle is stabilised.

BATTERY GUARD

What is the Battery Guard?
The Battery Guard monitors
the battery's state of charge
and battery voltage. The Bat-
tery Guard helps prevent deep
discharge of the battery and
enables appropriate recharging
in accordance with the drain on
the battery.