Fogging detecting system for an automotive vehicle and...

Details Fogging detecting system for an automotive vehicle and... Fogging detecting system for an automotive vehicle and...

2007-05-08

2007-05-08

Paschall, Mark (Department: 3742)

Electric heating

Heating devices

With power supply and voltage or current regulation or...

C219S203000, C219S494000, C219S492000

Reexamination Certificate

active

11383864

ABSTRACT:
A car defogging system reduces energy required to defog a windshield glass of the car. A temperature sensor mounted at the windshield glass detects the glass surface temperature, Ts. A humidity sensor spaced from the windshield glass by a predetermined distance detects the humidity, H, around the windshield glass. A temperature sensor mounted inside the windshield glass detects peripheral temperature Te around the glass. A system controller determines if fog is or is not present by comparing the dew point temperature Td with the surface temperature Ts. Dew point temperature Td is derived by the combining values of H and a temperature Tc based on a combination of Ts and Te.

REFERENCES:
patent: 6422062 (2002-07-01), King et al.
patent: 6862893 (2005-03-01), Wang
patent: 7028531 (2006-04-01), Nikolaus
patent: 2006/0004494 (2006-01-01), Errington

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