BMW K 1300 GT User Manual

Page 16

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BMW

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10/2008

Page 16

The principle of Alpha-n management with indirect control and monitoring of
the air drawn in via the throttle butterfl ies at a specifi c angle and engine speed
has been upgraded to provide the new concept of torque-based engine
management. The engine operating point is based in all cases on engine
speed and the angle of the throttle butterfl y determined by a potentiometer.
Then, taking additional engine and ambient parameters into account
(including the engine temperature, air temperature, ambient air pressure), the
engine management system, interacting with control maps installed in
advance as well as specifi c correctional functions, determines the appropriate
injection volume and ignition timing required.

Fuel injection is fully sequential, with fuel being injected into the intake ducts
exactly in line with the intake stroke of the respective cylinder.

Optimum supply of fuel ensured by variable pressure control.
The fuel supply system does not require a refl ow pipe or any other kind of
similar facility, but rather, thanks to variable pressure control, delivers exactly
as much fuel as the engine genuinely requires. Thanks to this fuel volume
control, fuel supply pressure may be varied almost at random in the interest
of optimum fuel/mixture formation. The fuel fed to the engine is controlled
by appropriate operation of the fuel pump, while the fuel/air mixture is
masterminded by an oxygen sensor located where the four exhaust manifolds
come together and precisely determining the composition of exhaust
emissions.

Supreme environmental compatibility, optimised response and even
more precise dosage of the gas lever.
The BMS-K control unit integrates the automatic idle speed control and the
cold start enrichment functions also on the K 1300 S. Idle speed is auto-
matically raised to a higher level when required in the engine warm-up phase
and is controlled by a so-called “idle stepper” (fully controlled bypass ducts
for additional air) integrated in the airbox and the appropriate injection of fuel.
The entire idle system has been set up anew on the K 1300 S.

The throttle butterfl ies on the K 1300 S measuring 46 millimetres or 1.81"
in diameter come with a new, desmodromic operating system, each with an
opening and closing cable, again in the interest of even more precise gas
dosage.

As an additional feature, the position of the butterfl ies predetermined by
the gas lever is precisely controlled and maintained by a step motor serving
to optimise engine response and gas dosage to an even higher standard.

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