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From: bohdan@ihgp1.ih.att.com (-Bodnar,B.L.)
Subject: Re: Fuzzy logic in central heating thermostat
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Date: Thu, 31 Aug 1995 13:03:16 GMT
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In article <809797384.32snx@kennis.hobby.nl>,
Julien Michielsen <jmichielsen@kennis.hobby.nl> wrote:
>I plan to change the heating in my house, and consider using fuzzy
>logic to smoothen the control of the boiler. I inquired if this is a
>running application, but I did not get a positive answer. Could anyone
>tell me if this exists as a commercial application? If this could be a
>self-installable aplication for a not very experienced person, and you
>have experience/knowledge in this field, I would like to hear your
>opinion.
>Julien Michielsen


I don't know whether such a device exists.  Adaptive temperature controls have
been used for decades and became available for home use in the 1980s (in the
United States, Canada, + ?).  For example, Honeywell's "Magicstat" thermostats
are adaptive.  I installed one in my home (suburb of Chicago) about seven
years ago -- it does an excellent job of adapting to temperature shifts as
long as the temperature swings are large enough.  I don't think it uses fuzzy
logic -- probably sets up a single compartment diffusion model and solves the
appropriate differential equation (Newton's law of cooling) with temperature
samples used to derive the appropriate coefficients for the equation.

Cordially,

Bohdan Bodnar
