Autopilot swaying left and right of track
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Replacing the entire AI.CFG file with the one from the G36 seems to also work well...
And, making the following changes to the AI.CFG file will smooth out the Heading Hold and Altitude Hold...
headingPID = 1.0, 0.01, 1.0, 0.2, 1.0
verticalSpeedPID = 1.0, 0.05, 0.2, 300.0,1000.0 -
@RetiredMan93231 So the "smooth" heading hold means that it will also no longer be swaying left and right?
Then I'd use your parameters instead of the G36 ones since those don't fix the vibration of Altitude Hold unfortunately.@copper said in Autopilot swaying left and right of track:
@RetiredMan93231 So the "smooth" heading hold means that it will also no longer be swaying left and right?
Then I'd use your parameters instead of the G36 ones since those don't fix the vibration of Altitude Hold unfortunately.I recommend doing both, because the G36 AI.CFG fixes the VOR/LOC tracking... Start with the G36 file, then add my additional fixes to the G36 file.
I don't see any pitch vibration after making these changes, but if you still have pitch vibration, you can also try adding this @weptburrito fix to the pitchPID parameters... https://community.justflight.com/post/8010
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@RetiredMan93231 said in Autopilot swaying left and right of track:
@copper, can you post the changes you made to correct this issue?
Sure:
Go to the ai.cfg of the G36:Official\OneStore\asobo-aircraft-bonanza-g36\SimObjects\Airplanes\Asobo_Bonanza_G36\ai.cfg
and copy the whole [STICKANDRUDDER] section (all the lines below it) from there and paste it into the ai.cfg of the addon:
Community\justflight-aircraft-pa28-arrow-iii\SimObjects\Airplanes\JF_PA28_Arrow\ai.cfg
replacing the [STICKANDRUDDER] section there.
I did not notice any negative side effects during numerous flights. I cannot judge if the behavior of the autopilot is now realistic or not, but I basically just need it to follow whatever I set it up to and that works fine.
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Here are some additional recommended changes that will further improve the autopilot performance...
ai.cfg
[STICKANDRUDDER]
;pitchPID = 2.0, 0.1, 5.0, 1.0, 100.0
pitchPID = 2.0, 0.1, 2.0, 1.0, 100.0;headingPID = 2.0, 0.01, 1.2, 0.2, 1.0
headingPID = 1.0, 0.01, 1.0, 0.2, 1.0;verticalSpeedPID = 0.5, 0.01, 0.35, 300.0,1000.0
verticalSpeedPID = 1.0, 0.05, 0.2, 300.0,1000.0;nav_yawPID = 0.015, 0.005, 0.001, 1.0, 360
systems.cfg
[AUTOPILOT]
yaw_damper_gain =0 ;2 -
Here are some additional recommended changes that will further improve the autopilot performance...
ai.cfg
[STICKANDRUDDER]
;pitchPID = 2.0, 0.1, 5.0, 1.0, 100.0
pitchPID = 2.0, 0.1, 2.0, 1.0, 100.0;headingPID = 2.0, 0.01, 1.2, 0.2, 1.0
headingPID = 1.0, 0.01, 1.0, 0.2, 1.0;verticalSpeedPID = 0.5, 0.01, 0.35, 300.0,1000.0
verticalSpeedPID = 1.0, 0.05, 0.2, 300.0,1000.0;nav_yawPID = 0.015, 0.005, 0.001, 1.0, 360
systems.cfg
[AUTOPILOT]
yaw_damper_gain =0 ;2@RetiredMan93231 said in Autopilot swaying left and right of track:
Here are some additional recommended changes that will further improve the autopilot performance...
ai.cfg
;nav_yawPID = 0.015, 0.005, 0.001, 1.0, 360
I notice that you didn't include a replacement for this line. Just checking to confirm whether that is what you intended.
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@RetiredMan93231 said in Autopilot swaying left and right of track:
Here are some additional recommended changes that will further improve the autopilot performance...
ai.cfg
;nav_yawPID = 0.015, 0.005, 0.001, 1.0, 360
I notice that you didn't include a replacement for this line. Just checking to confirm whether that is what you intended.
@Sender46 said in Autopilot swaying left and right of track:
@RetiredMan93231 said in Autopilot swaying left and right of track:
Here are some additional recommended changes that will further improve the autopilot performance...
ai.cfg
;nav_yawPID = 0.015, 0.005, 0.001, 1.0, 360
I notice that you didn't include a replacement for this line. Just checking to confirm whether that is what you intended.
Yes, this line has been commented out to completely remove this parameter...
This change, and the change to the Yaw Damper parameter, are needed to eliminate a constant left rudder input coming from the autopilot that causes the aircraft to slip during cruise flight. This aircraft has no autopilot rudder axis, so no rudder input should occur from the autopilot.
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It would generally be great to have a full STICKANDRUDDER section. Is your change based on the stock or on the G36 values?
@copper said in Autopilot swaying left and right of track:
It would generally be great to have a full STICKANDRUDDER section. Is your change based on the stock or on the G36 values?
I am using the complete AI.CFG file from the G36 as the basis for these changes...
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@RetiredMan93231 said in Autopilot swaying left and right of track:
@copper, can you post the changes you made to correct this issue?
Sure:
Go to the ai.cfg of the G36:Official\OneStore\asobo-aircraft-bonanza-g36\SimObjects\Airplanes\Asobo_Bonanza_G36\ai.cfg
and copy the whole [STICKANDRUDDER] section (all the lines below it) from there and paste it into the ai.cfg of the addon:
Community\justflight-aircraft-pa28-arrow-iii\SimObjects\Airplanes\JF_PA28_Arrow\ai.cfg
replacing the [STICKANDRUDDER] section there.
I did not notice any negative side effects during numerous flights. I cannot judge if the behavior of the autopilot is now realistic or not, but I basically just need it to follow whatever I set it up to and that works fine.
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It would generally be great to have a full STICKANDRUDDER section. Is your change based on the stock or on the G36 values?
@copper said in Autopilot swaying left and right of track:
It would generally be great to have a full STICKANDRUDDER section. Is your change based on the stock or on the G36 values?
Here is the full [STICKANDRUDDER] section of the AI.CFG file...
[STICKANDRUDDER]
rudderGroundPID = 0.015, 0.001, 0.001, 1.0, 1.0 ; Pk,Ik,Dk,I boundary, D boundary
throttleGroundPID = 1.0,0.10,10.0,10.0,20.0
brakeDifferentialPID = 0.0, 0.0,0.0,0.0, 0.0
throttleDifferentialPID = 0.0 ,0.0,0.0,0.0,0.0
throttlePID = 20.0,0.50,20.0,20.0,500.0
;pitchPID = 2.0, 0.1, 5.0, 1.0, 100.0
pitchPID = 2.0, 0.1, 2.0, 1.0, 100.0
rollPID = 1.2, 0.1, 0.6, 8.0, 100.0
;headingPID = 2.0, 0.01, 1.2, 0.2, 1.0
headingPID = 1.0, 0.01, 1.0, 0.2, 1.0
;verticalSpeedPID = 0.5, 0.01, 0.35, 300.0,1000.0
verticalSpeedPID = 1.0, 0.05, 0.2, 300.0,1000.0
nav_ex1PID = 3.5, 0.1, 10.0, 0.035, 50.0
;nav_yawPID = 0.015, 0.005, 0.001, 1.0, 360
glideSlopePID = 4.12, 0.05, 4.5, 2.0, 60.0
flightLevelPID = 100.0, 1.0, 10.0, 100.0, 1000.0 -
@Sender46 said in Autopilot swaying left and right of track:
@RetiredMan93231 said in Autopilot swaying left and right of track:
Here are some additional recommended changes that will further improve the autopilot performance...
ai.cfg
;nav_yawPID = 0.015, 0.005, 0.001, 1.0, 360
I notice that you didn't include a replacement for this line. Just checking to confirm whether that is what you intended.
Yes, this line has been commented out to completely remove this parameter...
This change, and the change to the Yaw Damper parameter, are needed to eliminate a constant left rudder input coming from the autopilot that causes the aircraft to slip during cruise flight. This aircraft has no autopilot rudder axis, so no rudder input should occur from the autopilot.
@RetiredMan93231 said in Autopilot swaying left and right of track:
@Sender46 said in Autopilot swaying left and right of track:
@RetiredMan93231 said in Autopilot swaying left and right of track:
Here are some additional recommended changes that will further improve the autopilot performance...
ai.cfg
;nav_yawPID = 0.015, 0.005, 0.001, 1.0, 360
I notice that you didn't include a replacement for this line. Just checking to confirm whether that is what you intended.
Yes, this line has been commented out to completely remove this parameter...
This change, and the change to the Yaw Damper parameter, are needed to eliminate a constant left rudder input coming from the autopilot that causes the aircraft to slip during cruise flight. This aircraft has no autopilot rudder axis, so no rudder input should occur from the autopilot.
Great explanation. Thank you.
