On 8 May 2012 21:52, gene heskett <[email protected]> wrote: > Silly Q probably, but could the pid.0.command value also be sent to > sum2.0.in0, and the pid.0.output sent to sum2.0.in1 to furnish the desired > offset, allowing the pid module to work with a much more balanced (read > closer to zero) output?
That is exactly what FF0 does, except with the benefit of there being no need to use any extra components, and with the benefit of scaling. So, with a PID module with zero PID gains, but an FF0 of 1, and a commanded speed of 2000, the output would be 2000. Which is probably too much. Set FF0 gain to 0.001 and the output becomes 2. Which might, or might not, be the correct answer, depending on the PWM scaling… >> I spent most of this afternoon at work tuning something that turned >> out to work best with 99% of the control coming from the D-term and 1% >> from I. But that was a rather unusual situation. > > Oh, can you share the hardware details? I probably shouldn't. It is a new controller in a car. -- atp The idea that there is no such thing as objective truth is, quite simply, wrong. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
