MAP DISPLAY SYSTEM

• US 20150308841A1
• Filed: 11/18/2013
• Published: 10/29/2015
• Est. Priority Date: 12/25/2012
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: MATSUNAGA, Takayuki, MIZUNO, Nobuhiro
• Granted Patent: US 9,664,523 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01C 21/30 Map- or contour-matching
• CPC Class Codes: G01C 21/367 Details, e.g. road map scale, orientation, zooming, illumination, level of detail, scrolling of road map or positioning of current position marker
• CPC Class Codes: G01C 21/3889 Transmission of selected map data, e.g. depending on route
• CPC Class Codes: G01C 21/3896 Transmission of map data from central databases
• CPC Class Codes: G06T 17/05 Geographic models
• CPC Class Codes: G08G 1/096822 where the segments of the route are transmitted to the vehicle at different locations and times
• CPC Class Codes: G08G 1/096844 where the complete route is dynamically recomputed based on new data
• CPC Class Codes: G09B 29/00 Maps; Plans; Charts; Diagrams, e.g. route diagram star maps G09B27/04; devices for holding or supporting maps A47B97/02; for computing purposes G06G1/14, G09B1/16; display boards G09F
• CPC Class Codes: G09B 29/005 Map projections or methods associated specifically therewith
• CPC Class Codes: G09B 29/10 Map spot or coordinate position indicators; Map reading aids optical projection apparatus per se G03B
• CPC Class Codes: G09B 29/106 using electronic means

Abstract

A navigation apparatus transmits current position information to a server. The server transmits course data to the navigation apparatus; the course data indicates a course that is predicted based on the current position information. The navigation apparatus corrects a subsequently measured current position on the course specified by the course data. The navigation apparatus transmits corrected position information indicating the corrected position to the server. The server distributes map data to the navigation apparatus; the map data corresponds to a specified area containing the corrected position specified by the corrected position information. Based on the received map data, the navigation apparatus displays a map near the corrected position on a screen of a display portion.

Claims

1. A map display system including

a map display apparatus to display a map based on map data having raster form that displays a map as an image, and

a server to distribute the map data to the map display apparatus,

the map display system comprising:

a current position measuring processor that is provided in the map display apparatus and measures a current position of one of the map display apparatus and a vehicle mounted with the map display apparatus;

a current position information transmission processor that is provided in the map display apparatus and transmits current position information indicating the current position measured by the current position measuring processor to the server;

a course prediction processor that is provided in the server and predicts a course of one of the map display apparatus and the vehicle based on the received current position information;

a course data transmission processor that is provided in the server and transmits course data indicating the course predicted by the course prediction processor to the map display apparatus, the course data having vector form;

a position correction processor that is provided in the map display apparatus and corrects the current position measured by the current position measuring processor on the course specified by the received course data;

a corrected position information transmission processor that is provided in the map display apparatus, settles, as a corrected position, the current position that the position correction processor corrects on the course, and transmits corrected position information indicating the corrected position to the server;

a map data distribution processor that is provided in the server, specifies the corrected position based on the received corrected position information, and distributes the map data corresponding to a specified area containing the corrected position to the map display apparatus; and

a map display processor that is provided in the map display apparatus and displays a map on a screen of a display portion based on the received map data.

2. The map display system according to claim 1, wherein:

the map data distribution processor distributes the map data to the map display apparatus, the map data corresponding to a specified area that contains the corrected position and is wider than a screen of the display portion; and

the map display processor displays a current position mark indicating the current position correspondingly to position data contained in the map data until the current position measured by the current position measuring processor deviates from an area corresponding to the received map data.

3. The map display system according to claim 2,

wherein the current position information transmission processor transmits the current position information to the server when the current position measured by the current position measuring processor is going to deviate from an area corresponding to the received map data.

5. The map display system according to claim 1,

wherein the course prediction processor predicts a course of the vehicle, the course being equal to a road nearest to one point specified by the corrected position information.

6. The map display system according to claim 1,

wherein the course prediction processor computes a vector connecting a plurality of points specified by a plurality of the current position informations and predicts a course of the vehicle, the course being equal to a road along the vector.

7. The map display system according to claim 1,

wherein the course prediction processor computes a vector connecting a plurality of points specified by a plurality of the current position informations and predicts a course of the vehicle, the course being equal to a road containing a link ahead of the vector in a traveling direction.

8. The map display system according to claim 1,

wherein the course prediction processor computes a vector connecting a plurality of points specified by a plurality of the current position informations and predicts a course of the vehicle, the course being equal to a road containing a link ahead of the vector in a traveling direction and another link whose road type equals a road type of the link.

9. The map display system according to claim 1,

wherein the course prediction processor computes a vector connecting a plurality of points specified by a plurality of the corrected position informations and predicts a course of the vehicle, the course being equal to a road containing a link ahead of the vector in a traveling direction and another link that is included in links connected to the link and has travel history.

10. The map display system according to claim 1,

wherein the course prediction processor computes a vector connecting a plurality of points specified by a plurality of the current position informations and predicts a course of the vehicle, the course being equal to a road containing a link ahead of the vector in a traveling direction and a link contained in a guidance route settled by a map display apparatus.

11. The map display system according to claim 1,

wherein the course prediction processor predicts a plurality of courses of the vehicle.

12. The map display system according to claim 1,

wherein the course prediction processor settles a priority of each link to form a road and predicts a course of the vehicle, the course being equal to a road containing a highly prioritized link.

4. (canceled)