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Mobile navigation system

  • US 5,892,463 A
  • Filed: 03/06/1997
  • Issued: 04/06/1999
  • Est. Priority Date: 09/05/1996
  • Status: Expired due to Term
First Claim
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1. A mobile navigation system comprising:

  • present position detecting means for detecting a present position of a moving object;

    map information storage means for storing map information;

    route searching means for searching a route defined from said present position of said moving object detected by said present position detecting means up to a destination place from said map information of said map information storage means;

    traffic information receiving means for receiving traffic jam information or traffic restriction information;

    specific region judging means for judging whether or not a traffic jam or restriction region is present within said route searched by said route searching means;

    degree detection means for detecting a degree of said traffic jam or restriction based upon said traffic jam or restriction information received by said traffic information receiving means;

    re-searching control means for causing said route searching means to search again a route in accordance with a detection result of said degree detection means;

    arrival time calculating means for calculating time required such that said moving object reaches said traffic jam or restriction region; and

    decreasing time detecting means for detecting time during which said traffic jam or restriction region is decreased based upon said traffic jam or restriction information received by said traffic information receiving means; and

    wherein said re-searching control means causes said route researching means to search again a route in accordance with a relationship between the output from said decreasing time detecting means and the output from said arrival time calculating means when said specific region judging means judges that the traffic jam or restriction region is present.

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