Governor Functional Description:
The propeller speed is conventionally controlled and kept by a mechanical propeller governor
but the set point of the governor is adjusted by an electric motor controlled by the EECU.
This electric motor substitutes the conventionally used Bowden cable and if e.g. the connection to the
set point actuator fails, the set point remains unchanged and the governor controls the propeller
speed to the last set-point.
The desired propeller speed set point is calculated depending on the power lever sensor position.
(refer to Governor Interface)
The current engine speed divided by the gear box ratio is used to compute the propeller speed
deviation which is then converted into an output ratio for the actuator
The propeller speed set point is set by an electric motor (actuator) in the governor system.
The governor controls the propeller speed via the propeller blade pitch angle
The actuator control ensures together with the monitoring a safe and correct actuation
If the set point is reached the actuator is deactivated and the governor controls the engine speed to
the set point.
Overview of propeller speed control:
Fig. 01 - 27 Propeller Speed Control
Engine
Governor
End
Stops
ECU
Set Point
Actuator
(Motor)
Propeller
Speed
Actuator
Control
Propeller
Speed
Control
End Stop
Feedback
Propeller
Pitch
Power
Lever
Sensor
Injection Quantity
Calculation
Engine
Torque
Injection
Quantity
Engine Speed Information
Actuator
Set Point
Calc
Demanded
Torque
Calculation
Desired
Propeller
Speed
Boost Pressure
Calculation
Boost
Pressure
Gear
Box
Engine
Speed
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