Rotax 912 i Series Installation Manual page 140

A huge quantity of sensors (e. g. sensors for measuring the pressure in
the airbox) and actuators (e. g. ignition coils) of the engine is designed
with redundancy. In this case, each of the sensors or actuators is con-
nected to a LANE, so that the two LANES have the same measurement
values and send the same output signals. Non-redundant sensors (e. g. oil
pressure sensors) are connected to one LANE only and serve for the
expanded monitoring of the engine functionalities. Due to an ECU internal
communication, these sensor values will be exchanged between the two
LANES (assuming that both LANES are active and free of errors).
Each LANE has a maintenance and a display interface (CAN-bus). While
the maintenance interface is required to work with the software B.U.D.S.
Aircraft to perform various diagnostic and maintenance activities, the dis-
play CAN interface enables the connection of a display for visualization of
engine parameters.
In addition to the ECU, the FUSE BOX is another major component of the
EMS. The FUSE BOX with its two rectifier regulators and generators (gen-
erator A and generator B) is responsible for a constant power supply to all
EMS components including fuel pump modul and the aircraft.
After engine start and before the engine has reached a defined speed for
a specified time (see latest Operators Manual), the EMS is powered by
generator B. After this threshold is exceeded, the generator B can be used
to supply the aircraft and to recharge the aircraft battery. In this system
state generator A supplies the EMS. In case of an error in the area of the
power supply, the EMS is re-switching to generator B for continuation of
the engine operation. In this case, the aircraft is no longer supplied with
power and the battery will not be recharged. This system state can only be
reseted with a full restart of the ECU.
NOTE:
Effectivity: 912 i Series
Edition 1/Rev. 2
BRP-Powertrain
INSTALLATION MANUAL
The generator (generator A or generator B) always supplies
the complete EMS (both LANES A and B). The assumption
that generator A supplies LANE A and generator B supplies
LANE B is false.
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January 01/2014