Autopilot model, subsystem Symmetrical autopilot modes
The subsystem Asymmetrical autopilot modes, which is part of the
systems APILOT1, APILOT2, and APILOT3 contains the following control modes
of the 'Beaver' autopilot:
-
Pitch Attitude Hold (PAH), including turn compensation
-
Altitude Hold (ALH), including turn compensation
-
Altitude Select (ALS)
-
symmetrical approach mode: Glideslope (GS)
The PAH mode is also used as inner-loop for ALH, ALS, and GS.
In Glideslope mode, a switch criterion is used to switch from the
Glideslope-Armed phase, in which the aircraft is usually flying under ALH
control, to Glideslope-Coupled. Note: for reasons of computing speed, GS
has not been included in the system APILOT1.
The block Select symm. mode-controller signals separates the
mode-switch settings from the inputvector ymode and reference
signals from the inputvector yref for the symmetrical autopilot
modes from the asymmetrical mode-switch settings and reference signals.
More information
See the explanation of the subsystems
Mode
Controller and
Reference Signals
for more information about the inputvectors
ymode and
yref.
See also the
color definition table for the FDC
toolbox and the subsystem
Asymmetrical autopilot
modes.
For a detailed description of the 'Beaver' autopilot, refer to the FDC user-manual. More information can be found in the following
references:
-
M.O. Rauw: A Simulink environment for Flight Dynamics and Control
analysis - Application to the DHC-2 'Beaver' (PART II).
MSc-thesis, Delft University of Technology, Faculty of Aerospace
Engineering, Delft, The Netherlands, 1993.
-
P.N.H. Wever: Ontwerp en implementatie van de regelwetten van de De
Havilland DHC-2 'Beaver' (in Dutch). MSc-thesis, Delft
University of Technology, Faculty of Aerospace Engineering, Delft, The
Netherlands, 1993.