Hi Tridge, I’m having problems with my 1900 sw APM2 to get hold airspeed and altitude. I already set the servo pid and see on the graph that these work well. The question is how to do the elevator controls airspeed and engine height as it was before?. (This method is located I worked great).
Martin Lere
[quote=“martinlere”]Hi Tridge, I’m having problems with my 1900 sw APM2 to get hold airspeed and altitude. I already set the servo pid and see on the graph that these work well. The question is how to do the elevator controls airspeed and engine height as it was before?
[/quote]
Hi Martin,
Do you have a tlog or dataflash log showing the issue?
Cheers, Tridge
Hi Tridge, today I will fly, and I will upload the night tlogs.
Hi Tridge, today I could not fly, because it rained. I pass an older tlog you see the error.
Funny, I want it differently - elevator trim controls height, throttle controls airspeed, because these are models and not full size and requirements are different.
So in other words:
Is this wrong (for RC models specifically NOT full size manned aircraft)?
If the pitch controls the height and the engine can not climb the elevator which meant the plane went into loss. And put limits does not work, and never behaves like a plane, but one day may ascend more and less another day, according to the weather.
If the elevator always be responsible for maintaining the fixed speed air (flying with engine or glider) the engine is responsible for winning or losing altitude. As such a climb is only limited by the power of the engine, not the maximum angle or other measures. The plane will never fly out of the air velocity values, with or without motor. And the limit on the ascent or descent is marked by the engine and the plane itself.
Sorry for my bad English.
if you want pitch to 100% to be used to control airspeed, TECS_SPDWEIGHT should be set to 2. This is recommended for gliders or low power models.
If you want pitch to 100% to be used to control height, set TECS_SPDWEIGHT to 0
The default setting is 1 which does a bit of both.
Oh that’s interesting, what happens to the throttle when you set things up like that Paul? So much I don’t know about the system I tend to chuck it in and just go flying!
obviously I tried to TECS_SPDWEIGHT to 1 and the results were similar or worse.
It could not be added as optional, the old system pid to control height and speed that worked perfect and was very easy to set up?
TECS is very carefully designed. Simply put, if it doesn’t perform well, it isn’t being tuned correctly.
If you follow the tuning guide properly, TECS should be capable of decoupling airspeed and height tracking, such that an airspeed change can be made without a height deviation, and a height change can be made without an airspeed deviation.
The argument over whether throttle/pitch controls airspeed/altitude is silly. Throttle adds total energy. Pitch converts between kinetic and potential energy. TECS uses them as such. The climb rate and descent rate parameters are used to compute how much power your throttle is outputting, and thus determine the throttle gain.
That said, it could certainly be made better, and Paul has plans to do exactly that. It will still need tuning.
I’ll wish the TECS will simplify something like the L1 controller, just one number to adjust. Or may be maximum 2 parameter. I think not many of us can coupe with 10 plus parameter which will affect one on each other.