On 10 December 2012 14:49, Kenneth Lerman <[email protected]> wrote:

> Regarding comments Jon has made about 'I', some systems I've worked on
> had something called "wind up limiting". The idea was to limit the
> amount of integral that could be added to the system.

There are two ways to achieve this that I have seen.
The first is a limit on P + I. So, if P is high then I is limited, and
for very high errors I is limited to 0.

Another thing I have seen (generally configurable as it is often
decidedly _not_ the thing you want) is an option to zero the I term
when the error crosses zero.

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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