Navigation system for vehicles with alternative route searching capabilities

  • US 5,931,888 A
  • Filed: 09/14/1995
  • Issued: 08/03/1999
  • Est. Priority Date: 09/22/1994
  • Status: Expired due to Term
First Claim
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1. A navigation system for automatically providing an automotive vehicle with route guidance in accordance with a route set in advance, the system comprising:

  • a position sensing unit for sensing the present position of the vehicle;

    an information storage unit containing map information and route information;

    an input unit for entering a destination and a transit point and for inputting a command to perform a route search;

    a notification means for outputting route guidance information; and

    a central processing unit having;

    a route searching means for performing a route search from the sensed present position to at least one of the destination and the transit point by setting a first searching range in response to the input of the route search command;

    a route memory means for temporarily storing a route found by said route searching means; and

    a route-guidance control means for outputting, to said notification means, a signal for performing route guidance on the basis of the stored route wherein said route searching means assumes that the stored route is a first route and searches for a second route, different from said first route, in response to the input of the route search command by setting a second searching range that is different from the first searching range.

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