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Radius of curvature detecting apparatus and the method thereof

  • US 6,138,084 A
  • Filed: 06/10/1998
  • Issued: 10/24/2000
  • Est. Priority Date: 06/12/1997
  • Status: Expired due to Fees
First Claim
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1. A radius of curvature detecting apparatus of a vehicle for detecting a radius of curvature of a curve located ahead of said vehicle based on road information obtained from a vehicle navigation system, comprising:

  • three-points detecting means for detecting a first point, a second point and a third point in order of traveling direction of said vehicle from point data showing a road configuration and provided by said vehicle navigation system, said first point and said third point being located on said road configuration, and said second point being located away from said curve to define a first tangent to the curve with the first point and to define a second tangent to the curve with the third point;

    distance comparing means for comparing a distance of a straight line connecting said first point and said second point with a distance of a straight line connecting said second point and said third point and for determining a short straight line and a long straight line, respectively;

    mid-point calculating means for finding a fourth point located at a half distance of said short straight line from said second point;

    equivalent mid-point calculating means for finding a fifth point located at said half distance from said second point on said long straight line; and

    radius of curvature calculating means for determining a point of intersection of perpendicular lines from said fourth point and said fifth point, respectively, as a center of said curve and for calculating a radius of curvature based on said center of said curve.

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