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Navigation instrument for roadway vehicles

  • US 4,216,530 A
  • Filed: 12/28/1978
  • Issued: 08/05/1980
  • Est. Priority Date: 01/10/1978
  • Status: Expired due to Term
First Claim
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1. A navigation instrument for roadway vehicles comprising:

  • means for generating an actual distance signal representing a distance travelled from a starting point of a journey;

    means for generating an elapsed time signal representing the length of time elapsed from said starting point;

    at least two of first, second and third means, said first means including means for arithmetically dividing said actual distance signal by said elapsed time signal to generate an average speed signal representing the average speed of said vehicle over said distance travelled from said starting point;

    said second means including means for generating a constant speed reference signal representing an estimated average vehicle speed, means for arithmetcially multiplying said constant speed reference signal with said elapsed time signal to generate a distance reference signal representing an estimated distance from said starting point, and means for arithmetically subtracting said actual distance signal from said distance reference signal to generate a distance deviation signal representing the deviation of said distance travelled from said starting point from said estimated distance; and

    said third means including means for generating a time deviation signal representing the deviation of said length of time elapsed from said starting point from an estimated length of time from said starting point; and

    means for visually indicating at least two of said average speed signal, said distance deviation signal and said time deviation signal.

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