Originally Posted by
Cat 1
can a OpenTX system measure temperature and pressure and adjust output to an air bleed valve?
Yes... The TX can do it, the question is whether you can program it.
The solenoid is active all over the range, and regardless of the needle settings, when the solenoid is given a dutycycle "X", the atmospheric correction "Y" will be relative to the value of "X". And this happens to be exactly what the engine needs. All you need to do is get the factors that determine "Y" correct, whch basically is to put the common gas law into formulas.
With the airbleed, that is quite a bit different, because now you are acting on the air side, not the fuel side. And not only is the airbleed valve probably not linear what the airbleed does basically comes down to "1+X", because the airbleed is adding air to the mixture, not fuel. That's an issue for which I cannot think of a simple formula to correct the airbleed with. I get the feeling that would require "mapping" (individual curves for each and every thinkable combination of temperature and barometric pressure...