Thanks for the explanation , that does help clear a few things .I'll
probably redo these files again shortly .
Cheers
On Tue, Mar 16, 2010 at 2:34 AM, Torsten Dreyer <tors...@t3r.de> wrote:
> > Hello ...
> > After the recent autopilot update , altitude hold doesn't work anymore
> for
> > me , (using pi-simple-controller) ....
> > Im not sure what effect to expect with the anti-windup addition , but my
> > guess is it's just exposing my poor
> > configuration.
> Syd,
>
> if you are referring to the b1900d or the Bravo, the only autopilot
> controllers that could be affected by the patch might be
> for the b1900d
> - Vertical Speed Hold
> - Descent FPM
> - IAS
>
> and the Bravo
> - Vnav Hold 1
>
> Unless I didn't introduce a bug, pi-simple-controller with a Ki of zero
> (aka
> pure gain) should not show a behaviour other than before the change.
>
> Curt made a nice description of anti-windup at
> http://www.flightgear.org/Docs/XMLAutopilot/node3.html
>
> <quote>
> Integrator wind up can occur when the system simply can't get to the target
> value, even at full control input. For instance a large truck commanded to
> go
> 90km/hr might slow to 70km/hr on a steep hill even at full throttle. During
> this time while climbing the hill, the integrator term is accumulating a
> tremendous amount of error. This is called integrator windup. Once you hit
> the
> crest of the hill you have to overshoot the target speed for a while to
> ``unwind'' the integrator term (which at this point may have grown very
> large.) This can cause you to significantly over-speed for as long as you
> were
> undershooting the target. This can lead to many unsafe and unstable
> situations
> so ``integrator windup'' is generally considered an undesirable
> </quote>
>
> Please let me know, if I can help fixing the problem.
>
> Torsten
>
>
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