Window fog detecting apparatus
First Claim
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1. A window fog detecting apparatus comprising:
- an optical type fog detecting sensor for optically detecting fog occurring at a window glass;
a humidity sensor for detecting a relative humidity of air at an interior side of the window glass for the sake of an anti-fog control which is performed to prevent fog from occurring at the window glass; and
a sensor output correcting unit, wherein when a fog occurrence at the window glass is determined based on the output values of the optical type fog detecting sensor, the sensor output correcting unit corrects the relative humidity detected by the humidity sensor based on output values of the optical type fog detecting sensor in the case where there exits a difference about the fog occurrence at the window glass between the relative humidity detected by the humidity sensor and the output values of the optical type fog detecting sensor.
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Abstract
A window fog detecting apparatus has an optical type fog detecting sensor for optically detecting fog occurring at a window glass, a humidity sensor for detecting a relative humidity of air at an interior side of the window glass, and a sensor output correcting unit. When a fog occurrence at the window glass is determined based on the output values of the optical type fog detecting sensor, the sensor output correcting unit corrects the relative humidity detected by the humidity sensor based on output values of the optical type fog detecting sensor.
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Citations
23 Claims
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1. A window fog detecting apparatus comprising:
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an optical type fog detecting sensor for optically detecting fog occurring at a window glass;
a humidity sensor for detecting a relative humidity of air at an interior side of the window glass for the sake of an anti-fog control which is performed to prevent fog from occurring at the window glass; and
a sensor output correcting unit, wherein when a fog occurrence at the window glass is determined based on the output values of the optical type fog detecting sensor, the sensor output correcting unit corrects the relative humidity detected by the humidity sensor based on output values of the optical type fog detecting sensor in the case where there exits a difference about the fog occurrence at the window glass between the relative humidity detected by the humidity sensor and the output values of the optical type fog detecting sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 20, 21, 22, 23)
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15. A window fog detecting apparatus, comprising:
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an optical type fog detecting sensor which includes a light emitting unit for emitting light toward a window glass and a light receiving unit for receiving reflection light from the window glass;
a fog-degree calculating unit for calculating a fog-degree judgment value based on a ratio of projection light from the light emitting unit to the reflection light;
a fog judging unit for judging a fog occurrence at the window glass based on the fog-degree judgment value; and
a first correction unit which corrects a calculation formula of the fog-degree judgment value, so that the fog-degree judgment value becomes substantially equal to a value indicating a non-occurrence of fog at the window glass in the case where the non-occurrence of fog at the window glass is determined by the fog judging unit. - View Dependent Claims (16, 17, 18, 19)
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Specification