[Paparazzi-devel] PID curve behave strange ?

[Eltonwu]

This is my PID parameter.
<define name="THETA_PGAIN"  value="500"/>
<define name="THETA_DGAIN"  value="380"/>
<define name="THETA_IGAIN"  value="0"/>
<define name="THETA_DDGAIN"   value="0"/>
This is my PID curves:
<http://lists.paparazziuav.org/file/n16104/%E5%B1%8F%E5%B9%95%E5%BF%AB%E7%85%A7_2014-09-10_%E4%B8%8B%E5%8D%883.png>
 

It is strange, the vibration is not around the set point, it vibrate above
the set point, but never exceed the set point,I try to decrease the dgain,
and the curve exceed the set point, but vibration become violent.

Anyone can explain it for me?
Thank you very much



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