Method of determining windshield fogging based on inference from

Details Method of determining windshield fogging based on inference from Method of determining windshield fogging based on inference from

1999-12-23

2000-12-05

Tanner, Harry B.

Refrigeration

Automatic control

Humidity sensor

62133, 165204, 165230, 236 44C, 236 91C, 454 75, F29B 4902

Patent

active

061550612

ABSTRACT:
A method is provided of determining windshield fog secondary for automatically controlling a heating, ventilation and air conditioning (HVAC) system of a vehicle. The method includes the steps of determining whether rain is occurring on a windshield of a vehicle, determining a windshield parameter as a function of the rain occurring and determining a temperature difference based on temperature within a cabin of the vehicle and ambient temperature. The method also includes the steps of determining a fog boundary based on the windshield parameter and temperature difference, determining a relative humidity based on the windshield parameter and the temperature difference and fog boundary and determining a fog probability based on the fog boundary relative humidity and a nominal base relative humidity for rain conditions. The method further includes the steps of determining anti-fog actions to be taken based on the fog probability and taking the anti-fog actions determined to control the HVAC system.

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