Route searching method for navigation system, and navigation system

• US 20070129882A1
• Filed: 05/23/2005
• Published: 06/07/2007
• Est. Priority Date: 06/17/2004
• Status: Abandoned Application

• Current Assignee: Xanavi Informatics Corporation (Hitachi, Ltd.)
• Original Assignee: Xanavi Informatics Corporation (Hitachi, Ltd.)
• Inventors: Sano, Katsumi, Toma, Kazuhiro
• Application Number:
  US10/581,691
• Publication Number:
  US 20070129882A1
• Time in Patent Office: Days
• US Class Current: 701/209
• CPC Class Codes: G01C 21/3446 Details of route searching algorithms, e.g. Dijkstra, A*, arc-flags, using precalculated routes

Abstract

A navigation system which shortens a time period from the setting of a destination to the presentation of a recommended route.

The navigation system to be mounted on a vehicle is provided with a storage device 3 stored with link information and a processor 1. This processor 1 is caused to execute: the process to detect stop of the vehicle; the process to detect a current position of the vehicle in case the stop of the vehicle is detected or in case the navigation system itself is started; the process to search a route from the detected current position to an intersection within a range of a predetermined distance, by using the link information; the process to accept a setting of the destination; and the process to search a route from the intersection to the destination by using the link information, in case the setting of the destination is accepted, to specify a route which is composed of the route searched from the current position to the intersection and the route searched from the intersection to the destination, as a recommended route.

Claims

1. A route searching method in a navigation system mounted on a vehicle which searches a recommended route to a destination by using link information,

characterized in that the navigation system executes:

the step of detecting a stop of the vehicle;

the step of detecting a current position of the vehicle in case the stop of the vehicle is detected or in case the navigation system itself is started;

the step of searching a route from the detected current position to an intersection within a range of a predetermined distance, by using the link information;

the step of accepting a setting of the destination; and

the step of searching a route from the intersection to the destination by using the link information, in case the setting of the destination is accepted, and specifying a route which is composed of the route searched from the current position to the intersection and the route searched from the intersection to the destination, as a recommended route.

2. A route searching method in a navigation system mounted on a vehicle which searches a recommended route to a destination by using link information, wherein

a display device is connected with the navigation system;

and

wherein the navigation system executes;

the step of detecting the current position of the vehicle;

the step of accepting an input of the destination from a user;

the step of displaying a screen to accept confirmation from the user whether or not the destination accepted is erroneous, on the display device;

the step of setting the destination in case data indicating that the destination is not erroneous is accepted from the user;

the step of searching the route from the detected current position to the accepted destination by using the link information, before the destination is set, in case the input of the destination is accepted; and

the step of specifying the searched route as a recommended route in case the destination is set.

3. A navigation system mounted on a vehicle which searches a recommended route to a destination by using link information, comprising:

means which detects a stop of the vehicle;

means which detects a current position of the vehicle in case the stop of the vehicle is detected or in case the navigation system itself is started;

means which searches a route from the detected current position to an intersection within a range of a predetermined distance, by using the link information;

means which accepts a setting of the destination; and

means which searches a route from the intersection to the destination by using the link information, in case the setting of the destination is accepted, to specify a route which is composed of the route searched from the current position to the intersection and the route searched from the intersection to the destination, as a recommended route.

4. A navigation system mounted on a vehicle which searches a recommended route to a destination by using link information, comprising:

means which detects a current position of the vehicle;

means which accepts an input of the destination from a user;

means which displays information to accept confirmation from the user whether or not the destination accepted is erroneous;

means which sets the destination in case data indicating that the destination is not erroneous is accepted from the user;

means which searches a route from the detected current position to the accepted destination by using the link information, before the destination is set, in case the input of the destination is accepted; and

means which specifies the searched route as a recommended route in case the destination is set.