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Route calculation method for a vehicle navigation system

  • US 7,818,121 B2
  • Filed: 01/21/2010
  • Issued: 10/19/2010
  • Est. Priority Date: 04/06/2004
  • Status: Expired due to Fees
First Claim
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1. In a navigation system having an output screen, a method for reducing the zigzag effect of rerouting a user in a vehicle from an existing route between a first location and a second location, comprising:

  • calculating an existing route between the first location and the second location;

    displaying the calculated existing route in the output screen;

    acquiring traffic information from a remote location;

    determining whether to reroute the vehicle to a new route based on the acquired traffic information;

    calculating the new route based on the acquired traffic information, if it is determined to reroute the vehicle to the new route;

    comparing the calculated new route with the existing route between the first location and the second location;

    determining a number of times the new route has been rerouted back to the existing route;

    continuing to display the existing route in the output screen, if the number of times is more than a predetermined number; and

    displaying the new route in the output screen, if the number of times is less than or equal to the predetermined number.

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