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Adaptive in-vehicle route guidance system

  • US 5,031,104 A
  • Filed: 11/29/1989
  • Issued: 07/09/1991
  • Est. Priority Date: 12/05/1988
  • Status: Expired due to Term
First Claim
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1. An in-vehicle navigator comprising:

  • map memory means for storing road map data consisting of road data comprised of the combination of nodes and links, and background data such as buildings;

    location detection means for detecting a vehicle location;

    initialization means for inputting a destination and a route calculation condition, which is selected by a vehicle operator from a plurality of route calculation conditions determined based on an evaluation function Fi=Σ



    mi×

    Am) where i is a route mode number, Σ



    m)=1, α

    m (m=1, 2, ..., n) is a weighted ratio of Am and A is an attribute of a link, or a varied route calculation condition, which is obtained by varying a weighted ratio α

    of said evaluation function to a desired value of said vehicle operator;

    route calculation means for reading road map data containing a current location and said destination from said map memory means, and for calculating a recommended route, based on said read road map and said selected or varied route computation condition inputted by said initialization means;

    memory means for storing said recommended route; and

    vehicle guidance means for detecting an approach to a junction on said recommended route, based on said vehicle location detected by said location detection means, and for reading road map data containing said function from said map memory means, and for enlarging and displaying the road map containing said junction, together with said vehicle location and said recommended route.

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