> > > Pease Porridge of
> > > Electronic Design ran a contest for a Fuzzy Control system that he
> could not
> > > duplicate or exceed the performance of.  He won every challenge using
> op-amps
> > > and classic control theory. Fuzzy Control and Fuzzy Logic has had lots
> of
> > > boasting and very little real substance.

> When ... developing Fuzz-C we looked hard for applications
> where fuzzy worked as well or better than conventional PID. When we did
> we found that PID was highly optimized for a narrow range of
> applications and fuzzy was a more general case.
>
> For example look at the momentum difference in an aircraft control system
> after the fuel stored in the wings has been burned in flight. A PID control
> loop in such a system is very hard to tune.


It may not be fair to compare PID vs. fuzzy. The biggest strength or
advantage you will obtain with a fuzzy logic is the range of
applications, the ability not only to have a competitive performance
where PID work well but also acceptable results in some applications
PID, or any other conventional control methodology, poorly works or
does not work at all.

But it may not be the most precise controller you can come up with
when you have other alternatives. Nevertheles, it is very robust and
simpler to implement.

__Aydin