>One possibility would be to dynamically create a function of all the
>appropriate variables (temperature, load, phase of moon, etc.) to modify the
>PID loops constants. This function would be refined over time (days, months,
>years).

......

>Does anybody have any good references/sources for such an adaptive system?

Is this not what fuzzy logic is supposed to be about? Never tried to do anything
in fuzzy logic, its just one of those things to do "one day".

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