8. Auto-Pilot Position Following
When the FS9/X or X-Plane NATIVE auto pilot is
engaged the system will drive the elevator and aileron axes to
follow the movement of the A/P control actions. When the A/P is
disengaged force feedback and flight control will be returned to the
Unless specific special
arrangements are made the CL software will not be able to recognise
3rd party A/P systems and so will not be able to activate the A/P
To disable A/P following mode
manually set Tab 4 Item 1 - APF_Enable parameter to zero. The
scaling of the A/P following movement can also be adjusted using Tab
4 Items 2, 3 & 4.
NOTE - when this A/P following is
active the CL software fully disengages the control axis inputs from
the flight sim via FSUIPC. So control movements applied to the
controls have no effect on the flight sim whilst A/P following is
active. When A/P is disengaged the CL software re-engages the
V2+ includes the capability to
disengage AP by moving the controls when they are in A/P-following
mode. The sensitivity of the disengage movement threshold is set in
Tab 4 Items 13, 14 & 15.
A/P position following uses a
closed loop position control PID algorithm implemented within the
BLDRV3 drives. The PID settings are specified in Tab 4 Items 16
to 24. The BFF_Driver_Test program can be used to tune for suitable
PID settings. CARE is required when adjusting the PID settings as
incorrect settings can cause unstable movement of the controls.
The maximum force levels in
position following mode are capped internally by the BLDRV3
card programming. The cap levels can be raised if your controls are
heavy and require larger forces to move than the default levels.
This will require adjusting the CL_SPU_USB EEPROM settings - thuis
can be done using the Diver Test App.
NOTE – the internal A/P operation
of FSX/9 does not use full elevator/aileron actions to control the
aircraft. Because of the this it is difficult to determine where the
“real” elevator position should actually be when the AP is
disengaged. A sudden pitch movement may therefore occur when control
is retuned to the yoke.
Automatic adjustment of the elevator trim during AP
following can be enabled for systems in which buttons are used
for trim input. It automatically adjusts elevator trim during
A/P following so keeping the elevator force in balance and so minimising
snatch on A/P disengage.
The feature also provides
a similar function for potentiometer trim input systems - however
this requires additional external hardware. The BFF Motorised Trim
Wheel can be used to control elevator trim and provides smoother A/P
Heavy Jet Mode 1
changes the way in which A/P following is implemented for the
elevator axis when the mode is active. See the above link for
details.... elevator trim is used as the A/P control action for
pitch control, and the elevator position is left stationary at mid.