MSFS20 Autopilot PID Values

[RukusDM]

Tuning ILS and Nav, along with throttle now.

 

[RukusDM]

Tuned Nav, ILS, Autothrottle and other adjustments. Still work to do but fly's pretty good.

 

[jcomm]

Thx for sharing! Will try to give it a try.

 

[robert young]

Rob, i don't see any PID values in systems.cfg I've been adjusting the PID values in ai.cfg and i am able to change behavior.

I stand corrected. I should have said the autopilot variables in the systems.cfg file. I realise they are not actually PID parameters but general a/p controls, though I'm guessing they rely on the PID values elsewhere.

 

[robert young]

Well, that makes it a PITA to "tweak" !!
But its only a SIM, so no reason why you cannot introduce a Impulse and see the response, in real time, to what the aircraft does.
The issue then become, you are looking at the combined response cause by both the AP and the planes dynamic and static stability.

So #1 is to measure the Planes Stability to an impulse, with the AP off.
Then, when that is "Good", either fully optimized, or something representing the real aircraft, only then can you start Optimising the AP to match that planes response.

I believe, as a RL private pilot of over 30 years, that for example, the MSFS's C172 is unrealistically Dynamically unstable in Pitch.
So trying to tweak the AP, to compensate for that is just covering up the issue, for a plane that does not even fly correctly with the AP OFF

Unfortunately, so many over on the MSFS Forum, are just complaining about the AP, (the Dolphin effect), without 1st considering that the AP can only do so much to tame an unstable aircraft.

If I allowed it, I would find it highly frustrating, especially having had a background in designing and testing RL Guided Missle Control system.

I agree very much with this. I'd like to add that in general all aircraft a/ps are incredibly sensitive in MSFS to where you place the C of G. If it is just a tad too far back (only needs to be a fraction) then I find you get a lot of porpoising, so I tend to err on the side of slightly forward C of G.

 

[Geoff_D]

I agree very much with this. I'd like to add that in general all aircraft a/ps are incredibly sensitive in MSFS to where you place the C of G. If it is just a tad too far back (only needs to be a fraction) then I find you get a lot of porpoising, so I tend to err on the side of slightly forward C of G.

AMAZING -- so a FUDGE the user can so is to move the CG far forward to reduce the porpoising !!! (until Asobo fixes it)

The question still remains WHY .. and it seems to be connected to the Dynamic stability and the sensitivity to trim to a stable configuration.

Can't wait to try moving the COG and see if it helps !!! thanks

Will probably be fine after the Christmas Holiday, when my C172 co-pilot & I put on some weight, eating too much.
Not going to make much difference in the Airbus !!

 

[robert young]

AMAZING -- so a FUDGE the user can so is to move the CG far forward to reduce the porpoising !!! (until Asobo fixes it)

The question still remains WHY .. and it seems to be connected to the Dynamic stability and the sensitivity to trim to a stable configuration.

Can't wait to try moving the COG and see if it helps !!! thanks

Will probably be fine after the Christmas Holiday, when my C172 co-pilot & I put on some weight, eating too much.
Not going to make much difference in the Airbus !!

To be fair it is not exclusively Asobo's issue. I had very similar experience when developing for FSX and P3d. It is not unreasonable that a slightly aft C of G might promote pitch instability under autopilot. In fact there are quite a few historical upsets in the real world, and a number of bad accidents caused by shifting cargo, over-loading, too much weight in the back of the aircraft and so on. A relatively small imbalance can create a serious situation because only a small value out of kilter produces a strong moment (a bit like a seesaw).

 

[Geoff_D]

Robert Young .. I recognize that name from my FSX days. Have been away from FS for over 10year .. MSFS drew me back to the addiction

Thanks -- You are amazing !!

Unfortunately, MSFS wont allow me to fit a bag full of helium in the rear of the C172, and set the baggage to a negative number, but to move the COG forward, I can Dump the CO-Pilot, and go on a severe diet, which will move the cog to the max forward position (as well a make the plane lighter, so it should climb better ? )

So I just tried that, and yes, a definite improvement to the Pitch damping after a pulse input to the yoke, disturbs the pitch.
(also, now a lot easier and faster to maually trim, which was a major issue before)
And doing the same with AP on, the aided AP response is faster, and more damped, without fewer, smaller reducing oscillations

I can live in a Virtual MSFS world without Food ... if it helps make the Plane fly better !!!

Now, if only I could "Destroy" some of these AI Planes, flying 1000's of miles away from me, I would stop Crashing as well (CTD)

Unfortunately, I think that is only something Asobo can do, from within the sim ??

 

[pmplayer]

Hi ,

This is a word to RukusDM:

I downloaded your beautiful A320neo testfiles2 and they fitting wonderful to this Aircraft - stunning work !
As Asobo dont get it that good along of 3 months now..

Now i would ask if you can do one for Asobos 747-8 if this is not to outrageous, but i am a big fan off 747`s
and do not mutch anderstand to work with that kind of stuff - unfortunately.

Asobos flightdynamic files not to bad they did a huge step forward as from first release but still far away from realistc..
And so i get sometimes crazy from looking at the plane and what it does about that dynamic files - kills the fun for me, at least as you fly mutch with a plane as i do with the 747-8.

So would it be possible to create one set files for this plane as it looks like "Sir" you are a specialist in kind of working around with this stuff.

Hoping..


regards

 

[tonaz]

Hello, is it possible to open a default aircraft in the Aircraft Editor (dev mode)?

proportional, integrator, derivative control...
who knows what they mean and do?

 

[WarpD]

Google: PID controller.