PID loop stability sensitive to command?
PID loop stability sensitive to command?
(OP)
From my long, long ago control theory classe I think that the stability of a PID loop is independant of the magnitude of the command, at least for a well behaved, linear system. Is that correct?
But I'm also thinking that if you were to give a large step command, you might set off an instability that wouldn't be set off with a small command (at least for the real world and its non-linear devices). Is that correct?
But I'm also thinking that if you were to give a large step command, you might set off an instability that wouldn't be set off with a small command (at least for the real world and its non-linear devices). Is that correct?





RE: PID loop stability sensitive to command?
Dan - Owner

http://www.Hi-TecDesigns.com
RE: PID loop stability sensitive to command?
RE: PID loop stability sensitive to command?
Dan - Owner

http://www.Hi-TecDesigns.com
RE: PID loop stability sensitive to command?
RE: PID loop stability sensitive to command?
I think you could pre process the input command so that it doesn't saturate control inputs by first low pass filtering the command input, if that is tolerable by your process.
Other possibilities are to turn down the integrator term with the resulting increase in steady state error, again if that is tolerable to your process.
RE: PID loop stability sensitive to command?