> -----Original Message-----
> From: Simon Nield [SMTP:simon.nield@QUANTEL.COM]
> Sent: Thursday, February 22, 2001 12:43 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [EE]: PID controllers (was PWM motor control)
>
> bob:
> >Does anybody have any good references/sources for such an adaptive
> system?
>
> "no, but..." (sorry!)
> you might want to look for a fuzzy logic control system. it was suggested
> by my lecturer back in
> university that there was a good chance that fuzzy logic systems may well
> end up as superior
> replacement for PID systems, due to the difficulties in tuning PID
> controllers.
> i am not sure if this was just part of the generally unbased enthusiasm
> for fuzzy logic for its own
> sake, or if the guy was right. what i do know is he was doing some
> research into it so he must have
> at least believed his own argument ... prehaps an avenue for you to
> investigate anyway, i don't know
> enough about it to recommend it or otherwise.
>
> Regards,
> Simon
>
I'd love a really good reference to fuzzy control systems.  Most of the
stuff I have seen suggests that Fuzzy control is just a grand name for a
heavily quantized control system  e.g.

if(water_temp >= very_cold)
        heater_output = 100;
else if(water_temp < very_cold  && water_temp >= cold)
        heater_output = 70;
else if(water_temp < cold  && water_temp >= cool)
        heater_output = 30;
else if(water_temp < cool  && water_temp >= tepid)
        heater_output = 5;

etc..etc...

I'm obviously missing the pint totaly a I can't see the advantage of having
discreet control steps over a continuous system such as a PID controller.

Someone care to enlighten this me?

Mike

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