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FLY_BY_WIRE_A control problem

Posted by Alex on October 16, 2010 at 12:40am
Hi

I am using the ardupilot 2.7.1, with airspeed sensor, and XYZ thermopiles.
My RX and TX is a futaba 2.4ghz radio
I am using a aircraft with elevators, and rudder control

I have already had many successful flights in stabilize mode and it is working perfectly.  However whenever i switch into FLY_BY_WIRE_A the aircraft will stabilize again perfectly, but I do not have any control over it, if i say put full left rudder on my radio the rudder servo will only move very slightly and as a result when I am flying in the air i basically cannot turn or pitch the aircraft.  I have very little control as to where i want to turn or pitch it.  I can control the throttle as I should in FBW A, however before trying auto throttle in FBW B, I would like to resolve this issue

I was wondering if this is a problem with my radio trims on the AP?  Or something else?  I was not using the GPS recievier when flying in Fly by wire A, as i dont think I need it.

Also I am basically using the standard header file, with some modifications for thermopile placement, gps etc.. aswell as setting the radio max/min limits as read from debug mode 1.

Any help would be greatly appreciated


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Replies

  • DaveyWaveyBunsenBurner November 6, 2010 at 12:16pm
    Hi,

    Sorry if this is too basic to be useful but i had the same issue and dialling up SERVO ROLL P in the PID tuning file fixed it a treat. The default value in 2.7.1 is 4 which i understand is way lower than the old versions.

    Hope this helps, and if you can get around to trying the possible bug in 2.7.1 i have posted i would appreciate it!.

    Cheers

    D
  • Developer
    Doug Weibel October 22, 2010 at 10:03pm
    Sounds like a calibration issue with the thermopiles. Do you have telemetry set up? When you fly in manual mode does the bank angle reported seem close to the actual bank angle. I'm guessing that the reported bank angle is much higher....
  • Moderator
    Alex October 16, 2010 at 12:56pm
    Thanks alot Jason for your help. I have attached the config file.\

    Regarding the switching back to stabilize, I am currently using a 6CH futaba radio and dont have a 3pos switch, so i am only switching between pos 1, and pos 3. So when i was testing stabilize, i was only switching between manual, and stabilize that I set to be pos 3

    For more information when i am testing FBW A on the ground, i do notice a very very small movement in response to my radio inputs, so when i was testing i could kind of make a turn if there was not too much wind, but it was nowhere more than a 5deg bank., and same with pitch.

    AP_Config.h

  • Developer
    Jason Short October 16, 2010 at 10:17am
    It sounds like something is not set up properly. Can you post your config file?
    You're right, you don't need GPS connected. Question, when you enter FBW A, and you don't have much response, can you go back to stabilize and it still works?

    If I don't see anything from the config files, I'll give you some debug code to try.
    Jason
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