Road surface condition detection system
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United States of America Patent
Stats
-
Sep 1, 1987
Grant Date -
N/A
app pub date -
Jun 12, 1980
filing date -
Jun 29, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
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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