Course guidance system with speeded-up display function

• US 4,532,514 A
• Filed: 08/13/1982
• Issued: 07/30/1985
• Est. Priority Date: 08/14/1981
• Status: Expired due to Term

• Current Assignee: Honda Motor Company
• Original Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Inventors: Mukai, Tadashi, Sasaki, Toshio, Hatano, Itaru, Yasui, Shinichiro, Mimori, Teruo, Takahashi, Kenji, Hirosawa, Shigeru, Kanda, Mikio, Ichikawa, Akira, Takahashi, Thuneo
• Primary Examiner(s): Caldwell, Sr., John W.
• Assistant Examiner(s): Heim, Michael F.
• Application Number:
  US06/407,999
• Time in Patent Office: 1,082 Days
• Field of Search: 340/990, 340/995, 340/750, 340/798, 340/799, 358/105, 358/140, 358/93, 358/206, 358/103, 364/424, 364/460, 364/444, 364/448, 364/449, 353/12
• US Class Current: 340/995.19
• 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: G08G 1/0969 having a display in the form of a map
• CPC Class Codes: G08G 1/137 the indicator being in the form of a map
• CPC Class Codes: G09B 29/106 using electronic means

Abstract

A course guidance system includes a direction sensor and a speed sensor both fitted to a moving body, a display mounted in the moving body and a map displayed in a manner corresponding to the display surface of the display and in which the present position of the moving body is derived by the direction sensor and the speed sensor and is plotted on the display in a manner corresponding to the map. The improvement comprises a locus memory for sequentially storing an X component value and a Y component value of the driving position based on a predetermined driving distance obtained from the speed sensor and on the driving position obtained from the direction sensor, a locus display memory for storing data in a manner corresponding to the display surface of the display, the data being obtained by reading the contents of the locus memory in a manner corresponding to the scale of reduction of the map, and a display for plotting the driving locus of the moving body on the display surface based on the contents of the locus display memory, wherein the data to be read when the contents of the locus memory is transferred to the locus display memory are divided into a plurality of groups each consisting of a data line to be read at a predetermined interval which are sequentially read and transferred, and the plotted line of the driving locus to be displayed is displayed sequentially and progressively from a rough display to a dense display.

Claims

1. In a course guidance system which includes a direction sensor and a speed sensor both fitted to a moving body, a display mounted in said moving body and a map displayed on the display surface of said display and in which the existing position of said moving body is derived by said direction sensor in cooperation with said speed sensor and is plotted on said display in such a manner as to correspond to said map, the improvement comprising:

a locus memory for sequentially storing an X component value and a Y component value of the driving position based a predetermined driving distance obtained from said speed sensor and on the driving position obtained from said direction sensor;

a locus display memory for storing data in such a manner as to correspond to the display surface of said display, said data being obtained by reading the content of said locus memory in a manner responsive to the scale of reduction of said map; and

a display for plotting the driving locus of said moving body on the display surface based on the contents of said locus display memory;

wherein the data to be read when the contents of said locus memory is transferred to said locus display memory are divided into a plurality of groups each consisting of a data line to be read at a predetermined interval and are sequentially read and transferred to the display, and the plotted line of the driving locus is displayed sequentially and progressively from a rough display to a dense display.

2. The course guidance system as defined in claim 1 wherein said display consists of a cathode ray tube.

3. The course guidance system as defined in claim 1 wherein said map is spread on the display surface of said display and is printed on a transparent film.

4. The course guidance system as defined in claim 1 which further includes a memory convertor for reading out the content of said locus memory, converting the data thus read out in accordance with the scale of reduction of said map and supplying the locus data to said locus display memory, and a memory convertor for converting the data read out from said locus memory in accordance with a specified linear or rotational orientation of said map, and supplying the locus data thus obtained to said locus display memory.

5. The course guidance system as defined in claim 1 which further includes a memory convertor for receiving correction data from a keyboard operation, applying the correction data to the contents read out from said locus memory to correct slight deviations between said map and the driving locus, and supplying the corrected locus data to said locus display memory.

6. The course guidance system as defined in claim 1 which further includes a memory convertor for correcting the transferred contents when the contents of said locus memory is transferred to said locus display memory so that offset quantities are individually added to the X coordinate components and Y coordinate components of the contents of said locus memory, and the transfer contents is thereafter transferred to said locus display memory.