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Method and apparatus for detecting the state of humidity on a road on which a vehicle is travelling

  • US 6,765,353 B2
  • Filed: 06/25/2002
  • Issued: 07/20/2004
  • Est. Priority Date: 06/29/2001
  • Status: Expired due to Fees
First Claim
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1. A method of detecting the state of humidity of a road for a vehicle, the vehicle including at least one driving light for illuminating the road ahead of the vehicle and an onboard optical sensor, the method comprising the steps, while the vehicle is moving along the road in a direction of travel, with said at least one driving light in use to direct a beam of light on a zone of the road in front of the vehicle of:

  • forming an image of said zone on the optical sensor, said zone comprising at least one segment oriented in the direction of travel, whereby said image is a characteristic profile representing the light distribution on the road;

    establishing a reference consisting of a characteristic profile representing light distribution in at least one equivalent segment of dry road; and

    comparing said image with the said reference so as to determine the instant state of humidity.

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