http://wikipedia.org/ is always a good starting place, in this case it is an extremely well documented, and laid out way of looking at it, with a brief history, as well as the mathemetical reasoning behind it:
I should have mentioned in that other posting that these types of control algorithms are known as feed-forward or feedforward control algorithms (as opposed to feedback control). Control theory is a huge and wonderous topic and any time spent understanding the subject will not be time wasted.
Kevin, or others
Can you reccomend a good book or other refrence that would be a good starting point to learn this, as I am a computer networking major I dont get to take classes like control theory and cant afford the time nor cash to take the classes at the moment. But I am very intrested in the topics, I have researched PID control some but would like any more information I can get.
I have taken a couple control courses in college, and they all tend to be pretty academic, which would have been pretty punishing entering into my current position as an on site trouble shooter in the automation industry. However, on my first day, my boss gave me an excellent book, actually written by a long time employee at the company I work for, Danaher Motion.
It assumes you have a bit of a understanding of control theory already, so perhaps this is the SECOND book you’d buy if you’re looking for good practical application and understanding of tuning parameters in the field.
If you click on the advanced search option here on CD and search on
Closed loop feedback
selecting ‘search titles only’ you will find a bunch of posts from previous years. most are locked so you cant reply to them, but lots of good info there.
PID stands for “proportional intergral differential”. In motion terms that corresponds to a control system that looks at “position, velocity and acceleration” of where you are compaired to where you want to be.