Refrigeration – Automatic control – Humidity sensor
Reexamination Certificate
2007-01-25
2010-12-07
Jiang, Chen-Wen (Department: 3744)
Refrigeration
Automatic control
Humidity sensor
C062S176200, C062S150000
Reexamination Certificate
active
07845182
ABSTRACT:
A method for controlling a vehicle HVAC system to automatically defog a window and to prevent fogging or condensation of the window. In-cabin air temperature and relative humidity are used to determine a dewpoint. Further, ambient or outside air temperature is measured. Window glass temperature is either estimated/calculated or can be measured. A fog margin, which is based upon the difference between the dewpoint and the window temperature, is calculated. When the ambient air temperature is below a predetermined temperature, a corrected fog margin is substituted for the calculated fog margin. When this occurs, the controller operates a fan at a reduced voltage, and hence at a reduced speed, as compared to if the controller used the calculated fog margin. Using the corrected fog margin prevents a vehicle user from being exposed to excessive fan noise or air currents during low or cold ambient air temperatures.
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Duell Mark E.
Honda Motor Co. Ltd.
Jiang Chen-Wen
Rankin , Hill & Clark LLP
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