Communication Interfaces; Propeller Gearbox - Rotax 912 iS Sport Operator's Manual

7.5.3) Fuel injection control

7.5.4) Communication interfaces

B.U.D.S Software

7.6) Propeller gearbox

Reduction ratio
Torsional shock
absorber
Governor
Page 7-14
January 01 2019
The engine is equipped with an electronic fuel injection system.
This system is controlled by the ECU and enables highly accu-
rate metering of the fuel according to operating and load condi-
tions, whilst at the same time also taking ambient conditions
into account.
The key input variables are throttle valve position, engine speed
signal, intake air temperature, ambient pressure, manifold pres-
sure and exhaust temperature. Ultimately, the required fuel
quantity or injection period is determined.
On the basis of the calculated air density in the airbox. It is
monitored continuously.
Each Lane has a maintenance and a display interface (CAN-
bus). While the maintenance interface is required to work with
the BUDS Aircraft Diagnostic Software to perform vari-
ous diagnostic and maintenance activities, the display CAN in-
terface enables the connection of a display for visualization of
engine parameters.
For engines of the ROTAX® 912 i Series, the maintenance and
BUDS Aircraft Diagnostic Software is available. This
provides not only the reading of ECU logs, it also provide a vari-
ety of functionality to support troubleshooting of the engine. To
start this software and connect the engine with a computer a
BUDS Aircraft Diagnostic Software kit is required. This
is a hardware interface that provides different software function-
ality depending on its version.
For the engine type 912 iSc/iS Sport one reduction ratio is
available.
Reduction ratio
crankshaft: propeller shaft
The design incorporates a torsional shock absorber. The shock
absorbing is based on progressive torsional cushioning due to
axial spring load acting on a dog hub.
Alternatively a hydraulic governor for constant speed propeller
can be used. The drive is via the propeller reduction gear.
BRP-Rotax
912 iSc/iS Sport
2.43:1
Effectivity: 912 i Series
Edition 2 / Rev. 0