So is altitude hold fixed in latest patch ?

[poochies]

Sorry not at  my computer to update OB 

[admiki]

Yes, both baro and radar hold

[Floyd1212]

It is much better again, and seems to hold a hover nicely once settled down. 

I don't know what to expect out of the system when intentionally maneuvering the aircraft with ALT hold enabled.  I was in a hover at tree-top level and tried to creep forward slowly with ALT Hold enabled and it allowed me to climb a bit before kicking in, then when I slowed back down to 0 it allowed me to descend a bit as well.

[poochies]

great thank you ! 

[corbu1]

Yes, feels much better now….

[Floyd1212]

Just flew again and there is still some oscillation there with Rad Alt Hold, but it is manageable.

[Fakum]

Since this appears to now be reasonably functional, the question I have is,,, is it better to use this in Radar Altitude Hold or Barometric IF your intent is to hover? Im not asking about while cruising, thanks

[Floyd1212]

I don't know that you have the choice.  Doesn't it decide which to use based on your altitude?

[corbu1]

vor 8 Stunden schrieb Floyd1212:

Just flew again and there is still some oscillation there with Rad Alt Hold, but it is manageable.

It‘s better than before, but some movement is still there in hover ……it‘s  a slow about 10 feet up and down move.

Edited November 19, 2022 by corbu1

[admiki]

27 minutes ago, corbu1 said:

It‘s better than before, but some movement is still there in hover ……it‘s  a slow about 10 feet up and down move.

 

I tried it yesterday. 

3 phugoids, each taking about 20 seconds to phase out. 1st +20/-10, 2nd +10/-10, 3rd +5/0. After that it's steady. 1200 ft AGL

Now, if I am at perfect zero, alt hold will just keep it there.

Problem a lot of people have is that they engage alt hold the moment VSI is at zero, it doesn't mean they are at stable altitude. It just means that helicopter wasn't climbing/descending as a reaction to your corretion from previous climb/descent, but it still has power setting which will not hold altitude. Why? Because you have to overcome inertia of your helicopter movement first. System needs time to compensate for that. If you hold that zero when you engage alt hold, it will hold with no oscilations.

[TZeer]

I work as an automation technician.

Oscillation makes me think the settings are not quite there yet when it comes to the values for the PID-controller.

The behavior (increasing oscillation) is typical to see in any automatic regulation where the P function of the PID-regulator is adjusted incorrectly. 
If the total amplification value in the loop is higher then 1 oscillation will increase, lower then 1 will decrease oscillation. P-function in a controller is the way to adjust this.

There are techniques to calculate the "correct" P-values, or at least an optimal setting to start tuning from.

Ziegler Nichols first and second method. One of them is based on step response, the other is looking at when the loop is going into a self sustained oscillation.

 

Edited November 19, 2022 by TZeer