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AutoQuad Forum • View topic - Alt Hold Issue

Alt Hold Issue

The last Bastion to fine tune your FC matching your airframe & setup

Alt Hold Issue

Postby chschmid » Sat Jul 13, 2013 8:37 pm

I am still concerned about my Alt_Hold tuning.

FW r196
#define NAV_ALT_POS_P 0.33 // Standard 0.20000000298
#define NAV_ATL_SPED_P 325 // Standard 200
#define NAV_ATL_SPED_I 6.25 // Standard 2.85
#define NAV_ATL_SPED_PM 170 // Standard 150
#define NAV_ATL_SPED_IM 700 // Standard 600
#define NAV_ATL_SPED_OM 750 // Standard 600

The Hexa sometimes still looses some altitude. And I is much to high. Today I was looking for a lost little rocket in the grass with my son. From some 20m altitude I hit RTL. I felt that the Hexa is coming in to low and added some "alt" with the throttle stick. Boom, the Hexa starts to oscillate like crazy (like in the instructional vid). After going to manual I could land safe.

So, what happened? Looks like the throttle input "engaged" the NAV_ATL_SPED_I term which otherwise is "locked" or maxed somehow.

Any suggestions are very welcome. I need to tune the Alt_hold right.

Cheers
Christof

hexa 13.7.2013 ALT_I issue overview.jpg


hexa 13.7.2013 ALT_I issue closeup.jpg
chschmid
 
Posts: 1800
Joined: Wed Jul 11, 2012 7:41 pm
Location: Herrliberg, Switzerland

Re: Alt Hold Issue

Postby leopold1 » Sat Jul 13, 2013 9:51 pm

Just to be sure, did you set your home position on the ground or in the air?
leopold1
 
Posts: 311
Joined: Tue Jul 31, 2012 11:43 pm
Location: Belgium

Re: Alt Hold Issue

Postby chschmid » Sat Jul 13, 2013 10:57 pm

Good question. After liftoff I set home position about 2m (516.1) above ground (513.9).
The first 2 RTL where very good and the 4th too.

Cheers
Christof
chschmid
 
Posts: 1800
Joined: Wed Jul 11, 2012 7:41 pm
Location: Herrliberg, Switzerland


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