Road surface condition detection system
First Claim
1. Road surface condition detection system comprising:
- light projecting means for projecting light including infrared light to a road surface to sense the condition thereof;
said infrared light having a wavelength or wavelengths at which the reflectance of snow is smaller than that of asid road surface in a dry condition,light receiving means for receiving light reflected from said road surface and for generating output signals representing the luminous energy of said reflected light;
comparison means for comparing said output signals with predetermined reference signals levels corresponding to classified road surface conditions so as to generate comparison output signals representing results of comparison; and
judging means for judging said road surface to be one of said classified road surface conditions in accordance with said comparison output signals.
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Abstract
Road surface condition detection system comprising light projector means for projecting light including the infrared region of the spectrum to a road surface to sense the condition thereof, the infrared having wavelengths at which the reflectance of snow is smaller than that of the road surface in a dry condition, light receiving means for receiving light reflected from the road surface, comparisons means for comparing the output signals generated from the light receiving means with reference signal levels corresponding to dry, wet, snowy and frozen conditions, and judging means for judging the road surface to be one of the conditions in accordance with results of comparison.
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Citations
11 Claims
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1. Road surface condition detection system comprising:
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light projecting means for projecting light including infrared light to a road surface to sense the condition thereof; said infrared light having a wavelength or wavelengths at which the reflectance of snow is smaller than that of asid road surface in a dry condition, light receiving means for receiving light reflected from said road surface and for generating output signals representing the luminous energy of said reflected light; comparison means for comparing said output signals with predetermined reference signals levels corresponding to classified road surface conditions so as to generate comparison output signals representing results of comparison; and judging means for judging said road surface to be one of said classified road surface conditions in accordance with said comparison output signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification