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Vehicular navigation apparatus

  • US 5,043,902 A
  • Filed: 08/23/1989
  • Issued: 08/27/1991
  • Est. Priority Date: 12/28/1987
  • Status: Expired due to Term
First Claim
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1. A vehicular navigation apparatus comprising:

  • a distance sensor for detecting distance travelled and for generating a distance signal;

    a vehicle travelling angle sensor for generating a signal for vehicle travelling angle;

    a curve detecting unit, provided with inputs of the distance signal and the travelling angle signal, for determining unit changes in vehicle travelling direction per unit of detected distance by applying said vehicle traveling angle signal to a travelling angle-travelling direction conversion means and for integrating said unit changes to obtain a value for travelling direction change;

    an exploration unit for receiving inputs of present position and destination and for retrieving a predetermined travelling direction change at an intersection or node based on position data and direction data;

    a comparison-decision unit for comparing the retrieved predetermined travelling direction change data with the value for change in vehicle travelling direction determined by said curve detecting unit; and

    a guidance processor for providing predetermined guidance responsive to the results of said comparing.

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