At 04:24 PM 10/07/2013, you wrote:
>This is often called feed-forward control - you predict how much control
>input your system is likely to need and then perform feedback control
>around that point to correct for disturbances and uncertainties. You can
>even make the system slowly auto-tune the feed-forward value based on
>observation of the amount of error.
>
>Sean

Hi, Sean:-

I would not call it feed forward unless it, say, measured the line
voltage and diddled the output to "correct" before waiting for a
deviation in the measured temperature. Or did something equivalent
to measure and model the effect of a demand change (for example,
increasing output as long as an access port is kept open).

I suppose you could consider the system I described as
"manual feed forward". ;-)

Best regards,
Spehro Pefhany

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