Hi,
Im currently working with ArduPlane 3.1.1 on an APM2.5 in a XUAV Talon.
I was looking at doing some autotuning; however, I wanted to test the system in FBWA first.
My understanding is that throttle control is manually controlled but bound by the THR_min and THR_Max. However, the throttle doesn't seem to be working correctly.
Manual
Ch3 (throttle) IN = 995 (low) to 2015 (high)
Ch3 OUT = 995 to 2015
FBWA
Ch3 (throttle) IN = 995 (low) to 2015 (high)
Ch3 OUT = 973 to 1099
The THR_PASS_STAB is disabled. THR_MAX = 100 THR_MIN = 0 This was tested in a static / bench test.
Am I missing something? or is there a parameter that is not set right?
I am using an airspeed sensor; however, my understanding is throttle output in FBWA is not dependent on airspeed.
Thanks in advance.
Adrian
Replies
Have you changed any of the following parameters, THR_PASS_STAB or TRIM_THROTTLE? I had a similiar problem and it was the TRIM_THROTTLE parameter. This is assuming that you have calibrated the radio channels correctly.
I believe I have calibrated the radio correctly.
The THR_PASS_STAB is disabled. It correctly does the pass thru if enabled.
I will have a look at the TRIM_THROTTLE figure.
Do you know how this affects the FBWA throttle?
Thanks
Adrian
I had a look at the TRIM_THROTTLE figure. This is set to 45 or 50% which I is the approx. throttle input (half throttle stick) required for a cruise on the Talon. Im not sure how this feeds into the throttle control in FBWA.
Adrian
Ok well that seems about right the. Does your RC3_trim and RC3_max correspond to where your ch3 max value of 2015?
Bingo....
Thanks Chris... I did have a look at the RC3 max value at this was definitely wrong (was set to 1099) which was the maximum figure I was seeing.
Not sure what this was wrong. Had completed a radio cal previously but possibly stuffed up it up sometime since.
Now to have more fun with autotune. :)