Automatic temperature and humidity regulation – Thermostatic – Expanding solid
Patent
1989-05-18
1990-01-30
Wayner, William E.
Automatic temperature and humidity regulation
Thermostatic
Expanding solid
621766, 236 44A, B60H 100
Patent
active
048965898
ABSTRACT:
An air conditioning control system for an automotive vehicle equipped with windowpanes has a humidity sensor for sensing humidity on the inner surface of a windowpane, and a temperature sensor for sensing temperature of the inner surface of the windowpane. When the sensed humidity on the inner surface is higher than a first predetermined value corresponding to the sensed temperature of the inner surface, the inner surface is determined to be in a state immediately before a mist occurs, and demisting control is executed. A second predetermined value lower than the first predetermined value by a predetermined amount is determined after the start of the demisting control. When the sensed latest value of the humidity on the inner surface becomes lower than the second predetermined value, it is determined that the mist has been cleared away, and the demisting conrol is stopped. The second predetermined value is determined based upon the sensed latest value of the temperature of the inner surface, and is set to a higher value as the sensed latest value of the temperature is higher insofar as the sensed latest value of the temperature is lower than a predetermined value. The first and second predetermined values may alternatively be determined based upon the difference between temperature within the vehicle compartment and the temperature of the windowpane inner surface.
REFERENCES:
patent: 4424933 (1984-01-01), Sutoh et al.
patent: 4787554 (1988-11-01), Bartels et al.
Diesel Kiki Co. Ltd.
McGuire Charles S.
Wayner William E.
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