Windshield defogging system and method
First Claim
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1. A windshield defogging system for a vehicle, comprising:
- a windshield including an electrical heating element;
an air circulation system including a blower to provide a stream of air over a surface of said windshield; and
a controller configured to select a duty cycle for said electrical heating element from predetermined data based upon air circulation system operating parameters and environmental conditions, wherein said controller is also configured to calculate a fogging probability value and said duty cycle is selected by said controller based upon air circulation system operating parameters, said fogging probability value and ambient temperature.
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Abstract
A windshield defogging system and method are provided. The system includes a heated windshield with an electrical heating element, an air circulation system with a blower to provide a stream of air over a surface of the windshield and a controller configured to select a duty cycle for the heating element based upon air circulation system operating parameters and environmental conditions such as ambient temperature.
17 Citations
19 Claims
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1. A windshield defogging system for a vehicle, comprising:
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a windshield including an electrical heating element; an air circulation system including a blower to provide a stream of air over a surface of said windshield; and a controller configured to select a duty cycle for said electrical heating element from predetermined data based upon air circulation system operating parameters and environmental conditions, wherein said controller is also configured to calculate a fogging probability value and said duty cycle is selected by said controller based upon air circulation system operating parameters, said fogging probability value and ambient temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of defogging a windshield of a vehicle equipped with (a) a windshield including an electrical heating element, (b) an air circulation system including a blower to provide a stream of air over a surface of the windshield and (c) a controller, said method comprising:
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selecting, by said controller, a duty cycle for said electrical heating element from predetermined data based upon air circulation system operating parameters and ambient temperature; and adjusting, by said controller, said duty cycle in response to a change in blower speed. - View Dependent Claims (16, 17, 18, 19)
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Specification