BMW R 1200 CL Service Manual page 13

R 1200 CL
Digital Motor Electronics MA 2.4
The fuel pump – together with a fuel pres-
sure regulator – ensure that adequate fuel
volume is available with constant pressure
to the fuel injectors. The fuel pump is
switched on by the fuel pump relay which is
controlled by the MA 2.4 control module.The
fuel system pressure in the distributor is
constant 3 bar.
The Motronic control module receives the
most important input signals from the hall
sensors (crankshaft rotational speed and
top dead center piston position) and from
the throttle position sensor (angular position
of the throttle valves).
Technical Features in Detail
The air volume drawn in is calculated (Alpha-
n-control) via the angle of the throttle valve
(Alpha) and the engine speed. The fine-tun-
ing takes place via an engine temperature
sensor, and the air temperature sensor and
the integrated barometric pressure sensor.
The oxygen sensor monitors the amount of
remaining oxygen content in the exhaust
gas. This allows the control module to
manipulate the fuel injector on time (Ti) to
maintain the optimum air fuel mixture. All
information is compared with the pro-
grammed characteristics in the control unit.
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