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Location detecting apparatus with overspeed predicting means

  • US 5,337,245 A
  • Filed: 11/03/1992
  • Issued: 08/09/1994
  • Est. Priority Date: 11/18/1991
  • Status: Expired due to Term
First Claim
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1. A location detecting apparatus comprising:

  • a road map memory having road map data stored therein;

    heading sensing means for sensing a heading of a vehicle;

    velocity sensing means for sensing a velocity of said vehicle to obtain distance traveled by said vehicle;

    location detecting means for integrating said distances and heading obtained every predetermined timing and for calculating an estimated location of said vehicle on the basis of the integrated distances and heading and for detecting a current location of said vehicle on a road on the basis of a degree of similarity between said estimated location and said road map data stored in said road map memory;

    road searching means for searching a road that is ahead of said current location detected by said location detecting means from among road map data stored in said road map memory;

    predicting means for reading configuration data of said road searched by said road searching means out of said road map memory, for calculating a radius of curvature of said searched road on the basis of said configuration data, and for calculating a predicted transverse acceleration to which said vehicle is exposed, on the basis of the calculated radius of curvature and said velocity sensed by said velocity sensing means; and

    means for comparing said transverse acceleration calculated by said predicting means with a predetermined threshold value and for giving warning to a vehicle operator if said transverse acceleration is greater than said predetermined threshold value.

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