On Friday 09 February 2007 18:14, Roy Vegard Ovesen wrote:
> On Friday 09 February 2007 18:24, leee wrote:
> > Hi Roy,
> >
> > I am getting this with the SU-37 and I believe the version in cvs
> > displays the problems. This is a pretty complex A/P setup with cascading
> > up to three levels and it also includes filters to un-tie some tied nodes
> > so that I could use listeners on the preperties. There are also still
> > some redundant controllers in there as well, just to confuse matters
> > further.
>
> Could you be more specific? Witch of the 21 pid controllers are not working
> in the SU-37 autopilot?
>
> Also could you tell me how to use the autopilot(s) in the SU-37? From the
> readme I gathered that it can be cotrolled from the mini-panel, but I'm
> unable to get the mini-panel to show, I tried "c" but that didn't seem to
> work.
I can't remember exactly which controllers were playing up but there did seem
to be a random element to it.
For the pitch modes the structure is
Pitch-hold
Climb-hold
Altitude-hold
AGL-hold.
The Altitude & AGL controllers set a target climb rate which is input to the
Climb controller. The climb controller outputs a target pitch angle which is
then used by the pitch controller to drive the elevon pitch component.
At the start of an auto take-off, just the pitch-hold is used to handle the
ground run and rotation. Once a set altitude is reached the climb-hold is
engaged to achieve a set climb-rate and finally, the altitude hold is
engaged.
During this sequence I've seen occasions where each of the controllers has
appeared to fail, e.g. sometimes the initial pitch hold just doesn't happen
and there's no rotation, sometimes the climb rate isn't effective and
sometimes the altitude hold is ignored. The locks all appear ok but the
output from the controller isn't updated. If leave the aircraft to continue
it's climb (on climb-hold) after the altitude hold hasn't worked and then
reset the A/P via the menu all the controllers then seem to kick in and, if I
can recover from the spin, the A/P seems to work ok.
Sometimes, if the altitude hold hasn't worked, the agl hold does.
Similarly, if I simply reset the A/P before starting then everything
subsequently works ok.
I found similar problems with the roll modes but there's only two stages of
cascading there.
The mini-panel 2d panel needs to be enabled by hitting 'shift-p' and then 's'
to toggle into the mini-panel. I find here that I need to switch the old hud
off (cycle by hitting 'h') to see the instruments - there seems to be some
interaction between the hud display and the 2d instruments.
There's a key to the A/P modes in the aircraft help menu but basically, if
someting is coloured green you can click it to toggle it.
This was all very experimental, from my point of view, hence everything's not
very well organised atm.
LeeE
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