IT Autoflight: Difference between revisions

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IT Autoflight (view source)

Revision as of 17:15, 21 April 2017

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==== Before you Begin ====
==== Before you Begin ====
* Download the latest version of IT-AUTOFLIGHT V3.0.0 Beta from [https://www.github.com/it0uchpods/IT-AUTOFLIGHT.git here]. Extract the Archive with WinRAR, 7Zip, or similar.
Download the latest version of IT-AUTOFLIGHT V3.0.0 Beta from [https://www.github.com/it0uchpods/IT-AUTOFLIGHT.git here]. Extract the Archive with WinRAR, 7Zip, or similar.
* JSB Aircraft ONLY:
 
<syntaxhighlight lang="nasal">
var aglgears = func {
    var agl = getprop("/position/altitude-agl-ft") or 0;
    var aglft = agl - 6.0;  # is the position from the Aircraft above ground
    var aglm = aglft * 0.3048;
    setprop("/position/gear-agl-ft", aglft);
    setprop("/position/gear-agl-m", aglm);
 
    settimer(aglgears, 0.01);
}
 
aglgears();
</syntaxhighlight>
 
Add this, and start the sim. Find the value of "/position/altitude-agl-ft" when on ground. Replace the 6.0 with that value. The gear-agl-ft property should read around 0, but not negative when on ground. Adjust as necessary.


==== Step One ====
==== Step One ====
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===== config/cmd =====
===== config/cmd =====
These adjust the parameters for the Command PID Controllers.
These adjust the parameters for the Command PID Controllers.
* '''roll-kp''': Adjust the Kp for HDG/LNAV PID.
* '''roll-kp''': Adjust the Kp for HDG/LNAV PID.  
* '''roll-scale''': Adjust the Gain Scale for the HDG/LNAV PID Input.
* '''roll-scale''': Adjust the Gain Scale for the HDG/LNAV PID Input. (This changes when the aircraft will begin to level, by changing the difference amount.)
* '''vorloc''': Adjust the Kp for the VORLOC PID.
* '''vorloc''': Adjust the Kp for the VORLOC PID.
* '''alt''': Adjust the Kp for the ALT CAP/HLD PID.
* '''alt''': Adjust the Kp for the ALT CAP/HLD PID.
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=== How to Tune ===
=== How to Tune ===
Coming soon...
So, now that IT-AUTOFLIGHT is installed, how do you tune it to the aircraft? IT-AUTOFLIGHT uses a config module, so you can drop in update to the system, with minor changes required. This also means you can tune IT-AUTOFLIGHT while FGFS is running, no need to reload anything! So lets get started!
 
* First, you need to adjust the area of the config module "settings". Once this is done, start FGFS.
* Takeoff normally. Once airborne, pause the sim (p)
* I highly recommend following this tuning guide in order, as IT-AUTOFLIGHT uses cascading controllers, tuning out of order may cause system instabilities.
 
==== Roll and Pitch ====
* Open the Property Browser (/), navigate to "/it-autoflight/output/"
* Set "lat" and "vert" to 9.
* Now engage AP1 or AP2.
* Now you can adjust "/it-autoflight/internal/target-roll-deg" and "/it-autoflight/internal/target-pitch-deg".
* Navigate to "/it-autoflight/config" and tune roll, and pitch, using the "target-roll-deg" and "target-pitch-deg" properties to test the configuration. It should be able to handle pitch changes from 5deg at once, to 10deg at once, and roll changes by 15, and 30 degrees. Once roll and pitch are stable, move on. (Adjust Kp values by -0.01/0.01, or -0.005/0.005, Do not adjust Ti and Td unless you know what they do. ROLL ONLY: Remember that vloc uses a different Kp. I recommend to use the same as regular Kp, unless specially needed.)
 
==== CMD and Autoland ====
Important Note: Most of the time, this tuning is not required to be changed. Only adjust if the controllers do not work optimally.
* Adjust the values in cmd Next. To see what each value does, see Tuning and Configuration above.
* Tune V/S First, then FLCH, then ALT CAP/HLD, then HDG SEL/HLD/LNAV.
* Once those are all working, tune LOC and G/S. Easy way to test: KNUQ RW32R, takeoff runway hdg, climb 2000ft. ILS: 109.55. ARM ILS once above 250ft. Aircraft should intercept ILS.
* Once LOC and G/S are working, tune the Autoland. Most of the time, you can just use the "roll/kp", for "autoland/roll-kp". The "autoland/pitch-kp" is for the LAND/FLARE modes. Lastly, "autoland/rudder-kp" is for the Rudder LOC track.
 
==== Complete ====
The tuning is now complete. VNAV modes use ALT CAP/HLD, VS, and FLCH controllers. If those are tuning, VNAV works just fine. Remember to check the CHANGELOG.txt after each IT-AUTOFLIGHT Update, to make sure, nothing needs to be retuned.


== SDK ==
== SDK ==
Octal450
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