Shower water automatic temperature controller

Automatic temperature and humidity regulation – Mixing fluid of dissimilar temperature – Mixing valve with temperature motive means

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Details

4677, G05D 2312, E03C 104

Patent

active

059442557

ABSTRACT:
A self-contained unit 160 that rapidly and accurately senses, controls and maintains the temperature of water delivered to the user of a shower or bath. The invention allows a user to preset a desired water temperature using a manual control interface 60 and uses a sensor 10 located on (or within) the mixer outlet pipe 20 to measure the temperature of the mixed water being delivered to the user. The sensor produces an input signal that is used by a microprocessor 30 to calculate both derivative gain and proportional gain, and fuzzy logic may also be used by the microprocessor to produce an output signal, such that the system responds quickly and accurately to both quantum temperature changes and to the rate of temperature change. The output signal controls a motor 80, that via the action of gears 90, controls the action of the water mixer valve 110 thus maintaining a constant temperature of water delivered to the user. The present invention also allows a number of users to preset temperatures for their own comfort, and to select this preset temperature before entering the shower, so negating the need for manual "trial and error" adjustment. Importantly, the present invention is also designed so that any lay-person, with no plumbing experience and the minimum of mechanical ability may retrofit the device to an existing water delivery system.

REFERENCES:
patent: 4281790 (1981-08-01), McGinnis
patent: 4421269 (1983-12-01), Ts'ao
patent: 4785845 (1988-11-01), Kochal
patent: 4854499 (1989-08-01), Neuman
patent: 4945943 (1990-08-01), Cogger
patent: 5090436 (1992-02-01), Hoch
patent: 5125433 (1992-06-01), DeMoss
patent: 5240028 (1993-08-01), Hoch
patent: 5868311 (1999-02-01), Cretu-Petra

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