The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 2010
Filed:
Jan. 25, 2007
Daniel Yelles, Marysville, OH (US);
Daniel Yelles, Marysville, OH (US);
Honda Motor Co., Ltd., Tokyo, JP;
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.