At 12:37 12/28/98 -0600, John Payson wrote:
>Is the preference for PID systems primarily a result of inertia, or
>is there some other benefit that PID-modeled systems have over more
>application-modeled ones?

if you know your acc and dec precisely, your approach is probably close to
optimum, but often that is not the case. if you don't know it, your
approach gets a bit more complicated, and probably eventually it becomes a
rule-based system like fuzzy.

i would tend to think that you're right and in many cases a pid approach is
not the best solution in the digital domain -- but it's easy to implement,
if you have the right parameters. which may not be so easy to get...

if i had to do a control loop, i would not go pid as a first approach, but
i can imagine that in some (many?) cases i would end up with some kind of
pid-like algorithm.

BTW, does anybody have experience with fuzzy-implementations?

ge