Hi all, I=92ve taken R.M. Phelan=92s =93Automatic Control Systems=94, with= me on vacation. (Gotta have something to read on the beach besides trashy novels.) Half way through the book he finally gets to his idea of pseudo differential feedback (PDF) control. Perhaps best visualized at this website,
This looks interesting! And I wonder if any of you have tried it (in practice)? The PI(D) controllers that I=92ve built always have an overshoot. (Which I now understand comes from the zero in the transfer function.) It strikes me that I should be able to tune the PDF system for a slightly underdamped system and get an even nicer* step response.
Are there any gotcha=92s in PDF control? Thanks for reading,
George H.
*nicer for me would be shortest time to ~1% error (or something like that.)