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Re: [Paparazzi-devel] another fatal crash (Eduardo lavratti)


From: Norman Wildmann
Subject: Re: [Paparazzi-devel] another fatal crash (Eduardo lavratti)
Date: Fri, 01 Jun 2012 09:01:24 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:12.0) Gecko/20120430 Thunderbird/12.0.1

Hi Eduardo,

last year we were experimenting a lot with the airspeed controller and were running into the same problem with a killed throttle in AUTO2. There were actually two different reasons on two different occasions:

- One time we had a wrong value in our AUTO_AIRSPEED_PGAIN. This value should be positive!! This is easy to check on the ground if you click on the launch button in the GCS and then switch to AUTO2 and see if there is throttle. Maybe remove the props for those tests... - The other time we were measuring a wrong battery level and there is the safety feature that will kill throttle in catastrophic battery level (see the kill mode description: http://paparazzi.enac.fr/wiki/Failsafe#Kill_mode). You can easily get rid of this safety feature or change the catastrophic battery level.

Maybe one those solutions work for you too.

Regards,
Norman


On 01.06.2012 07:43, address@hidden wrote:
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Today's Topics:

    1. Re: another fatal crash (Eduardo lavratti)
    2. Re: Paparazzi-devel Digest, Vol 98, Issue 92 (Eduardo lavratti)


----------------------------------------------------------------------

Message: 1
Date: Fri, 1 Jun 2012 05:34:02 +0000
From: Eduardo lavratti<address@hidden>
To: Paparazzi developer forum<address@hidden>
Subject: Re: [Paparazzi-devel] another fatal crash
Message-ID:<address@hidden>
Content-Type: text/plain; charset="iso-8859-1"


wow .. more friends with same problema.
well, i simulated this problem and re-checked all my config.

i changed some parameter in V_CTL and the simulation are working very well for 
now.

try change your v_ctl with this parameters and publish the result here :


    <section name="VERTICAL CONTROL" prefix="V_CTL_">
     <define name="POWER_CTL_BAT_NOMINAL" value="16.0" unit="volt"/>
     <!-- outer loop -->
  <define name="ALTITUDE_PGAIN" value="0.05"/>
<!--<define name="ALTITUDE_PGAIN" value="0.0869999974966" unit="(m/s)/m"/>-->
     <define name="ALTITUDE_MAX_CLIMB" value="4." unit="m/s"/>
     <!-- auto throttle inner loop -->
     <define name="AUTO_THROTTLE_NOMINAL_CRUISE_THROTTLE" value="0.5"/>
     <define name="AUTO_THROTTLE_MIN_CRUISE_THROTTLE" value="0.4"/>
     <define name="AUTO_THROTTLE_MAX_CRUISE_THROTTLE" value="0.9"/>
     <define name="AUTO_THROTTLE_LOITER_TRIM" value="2000" unit="pprz_t"/>    <!-- 
elevador trim para voo loiter (lento) -->
     <define name="AUTO_THROTTLE_DASH_TRIM" value="-1500" unit="pprz_t"/>  <!-- 
elevador trim para voo dash (rapido) -->
     <define name="AUTO_THROTTLE_CLIMB_THROTTLE_INCREMENT" value="0.15" 
unit="%/(m/s)"/>  <!-- 0.1 -->
     <define name="AUTO_THROTTLE_PGAIN" value="0.008" unit="%/(m/s)"/>  
<!--0.02-->
     <define name="AUTO_THROTTLE_IGAIN" value="0.25"/>
     <define name="AUTO_THROTTLE_PITCH_OF_VZ_PGAIN" value="0.14"/>   <!-- 0.05 
pitch devido a erro altitude -->
     <!-- auto airspeed and altitude inner loop -->
     <define name="AUTO_GROUNDSPEED_SETPOINT" value="15.0" unit="m/s"/>
     <define name="AUTO_GROUNDSPEED_PGAIN" value="0.75"/>
     <define name="AUTO_GROUNDSPEED_IGAIN" value="0.25"/>
     <define name="AUTO_PITCH_PGAIN" value="0.145"/>
     <define name="AUTO_PITCH_IGAIN" value="0.025"/>
     <define name="AUTO_PITCH_MAX_PITCH" value="RadOfDeg(25)"/>
     <define name="AUTO_PITCH_MIN_PITCH" value="RadOfDeg(-25)"/>
  <define name="THROTTLE_SLEW_LIMITER" value="2" unit="s"/>
   </section>

Date: Fri, 1 Jun 2012 09:22:40 +0530
From: address@hidden
To: address@hidden
Subject: Re: [Paparazzi-devel] another fatal crash

Hi all,
    I am also using the latest repository, yesterday I found when i engage 
AUTO2 throttle stops completely. In Manual I could fly well but moment I engage 
AUTO2 throttle gets cut and aircraft starts falling down. Anybody please 
suggest how to rectify this problem? I am also trying to find the reason for 
the throttle cut, but nothing clicked yet.


Another problem I faced was during flight In Auto2 Iam unable to change the 
gains from the Ground control station? When on Ground I tried this exercise of 
changing gains in AUTO2 it works well. Are there any  altitude limitations? or 
I should ensure Aircraft is level? or any other settings that needs to be done?


Kindly help



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