System and method for vehicle defogging condition...

Details System and method for vehicle defogging condition... System and method for vehicle defogging condition...

2011-01-11

2011-01-11

Jones, Melvin (Department: 3744)

Refrigeration

Processes

Circulating external gas

C062S176100

Reexamination Certificate

active

07866169

ABSTRACT:
A method and apparatus for controlling a vehicle HVAC system to automatically defog a windshield glass and to prevent fogging or condensation of the windshield glass. The ambient air temperature and vehicle speed are measured and used to determine a windshield glass temperature. The in-cabin air temperature and relative humidity are measured and used to determine a dewpoint. An dewpoint margin is calculated to compensate for sensor accuracy and fog predictability. A fog margin, which is based upon calculated windshield glass temperature and dewpoint, is calculated and used, in conjunction with the dewpoint margin, to control the HVAC system to anticipate potential fogging conditions and to scale the intensity of the HVAC system response based upon the severity of fogging conditions.

REFERENCES:
patent: 6625995 (2003-09-01), Remond et al.
patent: 7102501 (2006-09-01), Lo Presti et al.
patent: 7690421 (2010-04-01), Burns et al.

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