Device for determining distance between vehicles

  • US 5,929,784 A
  • Filed: 08/19/1997
  • Issued: 07/27/1999
  • Est. Priority Date: 02/17/1994
  • Status: Expired due to Fees
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First Claim
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1. A device for determining the distance between one vehicle traveling in a traffic lane defined by a lane line and a vehicle ahead also traveling in said traffic lane, comprising:

  • a pair of light receivers each having a light sensor array;

    line detecting means for determining the position of the lane line by detecting an image at a maximum point in a distribution of a quantity of light on said light sensor array of at least one of said pair of light receivers, and providing an output signal representing a position of the lane line, said output signal being based on only said maximum point;

    measuring range detecting means responsive to said output signal of said line detecting means for detecting the width of the traffic lane; and

    distance detecting means for determining the distance to said vehicle ahead on the basis of a position where an image of said vehicle ahead is formed on said light sensor array within a range of said traffic lane detected by said measuring range detecting means, wherein said distance detecting means disregards objects outside of said range of said traffic lane.

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