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Device for detecting road surface condition

  • US 4,781,465 A
  • Filed: 01/09/1987
  • Issued: 11/01/1988
  • Est. Priority Date: 12/23/1983
  • Status: Expired due to Term
First Claim
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1. A device for detecting road surface condition in front of a car, comprising:

  • distance measuring means including means for emitting directional beams from a beam source arranged at a predetermined height above a road surface, said directional beams being directed at predetermined different radiating angles relatively to a horizontal line, thereby irradiating at least three points on a line on the road surface in front of the car in its running direction and means for receiving the respective beams which have been reflected from the road surface for thereby measuring the respective distances between the respective irradiated points and the beam source; and

    means for effecting a predetermined arithmetic operation and for deciding from said arithmetic operation whether a flat condition of the road surface on said line is met or not on the basis of data concerning the distances of said at least three measured points, thereby determining uneven condition of the road surface in front of the car.

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