Method and apparatus for calibration of comfort control IR senso

Details Method and apparatus for calibration of comfort control IR senso Method and apparatus for calibration of comfort control IR senso

1995-02-01

1996-07-02

Wayner, William E.

Automatic temperature and humidity regulation

Ventilator type

Electrically actuated

374128, 236 91C, G01J 500, G05D 2300

Patent

active

055313779

ABSTRACT:
An infrared sensor for determining the temperature of a car interior includes a thermistor and a thermopile in a can and a protective window which exposes the thermopile to the thermal energy of the car interior. The combined outputs of these thermally sensitive elements represents the interior radiant temperature. The effectiveness of the thermopile changes if the window gets dirty to change its output. A resistive heater on the can is used to heat the sensor during calibration. A microprocessor receiving the outputs of the sensor has an algorithm for adjusting a gain which compensates for sensor changes. When the interior temperature is stable, the sensor is heated and thermistor values before and after heating the sensor are used as a basis for adjustment of the gain.

REFERENCES:
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patent: 2835779 (1985-05-01), Kazan
patent: 4920759 (1990-05-01), Tanaka et al.
patent: 5105366 (1992-04-01), Beckey
patent: 5114242 (1992-05-01), Gat et al.
patent: 5148977 (1992-09-01), Hibino et al.
patent: 5150969 (1992-09-01), Goldberg et al.
patent: 5187943 (1993-02-01), Taniguchi et al.
patent: 5333784 (1994-08-01), Pompei
U.S. patent application Ser. No. 08/158,555; Freiberger Nov. 1993.

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