JPS606978A - Running position display for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field The present invention relates to a vehicle travel position display device that displays necessary road map information on a limited screen to make the road map easier to view.

(b) Prior Art Recently, a device has been developed that displays a road map of the area in which the military is driving on a cathode ray tube, and displays the departure point, destination, current location, travel trajectory, etc. on the map to make driving more convenient. It is called a map display device or a driving position display device. In this type of device, the driving area is divided into areas of appropriate size, road map information for each area is stored on a cassette tape, etc., and the cassette tape containing the road map of the driving area is recorded as needed. Once selected and installed, the road map of the area is visually displayed on the screen, and the vehicle's travel trajectory is displayed on the road map based on the driving direction information obtained from the direction sensor and the distance traveled information obtained from the distance sensor. (For example, Japanese Patent Application Laid-Open No. 57-206817).

In such driving position display devices, a method is adopted in which main roads, narrow roads such as side streets, rivers, railways, etc. are displayed on the display screen, or roads other than main roads are omitted. The display screens of cathode ray tubes that can be installed in vehicles are small and their display density is lower than that of printed maps, making road maps extremely difficult to read.
Furthermore, if there is little map information, even if the current location and travel trajectory are displayed, there is a problem that the function as a road guide will not be sufficient because there will be fewer targets that need to be visited to reach the destination.

Purpose and Structure of the Invention The present invention has been made in view of the above points, and an object of the present invention is to display necessary road map information on a limited screen to make the road map easier to view. The map is configured so that the intersections where major roads intersect with narrow roads such as side streets, railways, rivers, etc. are displayed with different predetermined symbols.

FIG. 1 is an overall configuration diagram showing the configuration of the present invention. Based on the traveling direction detected by the direction sensor and the distance traveled detected by the distance sensor, a calculation circuit calculates the current position and travel trajectory of the vehicle, and calculates the current position and travel trajectory of the vehicle on the road map read out from the storage means. Main roads are narrow roads such as side streets, railways,
This display unit displays a road map including map information in which intersections with rivers and the like are stored in predetermined different symbols.

(→Example The present invention will be explained below based on the drawings.

FIG. 2 shows a block diagram of the traveling position display device according to the present invention, in which reference numeral 11 is a direction sensor that detects the direction by detecting the X and Y components of the earth's magnetic field according to the direction in which the vehicle is traveling;
is an A/D converter that converts an analog direction signal from the direction sensor 11 into a digital signal, I3 is a distance sensor that outputs a distance pulse every time the vehicle travels a unit distance, and I4 is a plurality of signals stored on the cassette tape 14a. A map data reading device that searches and reads road map data of the area; 15 is an interface circuit that inputs direction signals, distance pulses, and map data; 16 is a central processing unit (CPU) that performs digital arithmetic processing according to a predetermined control program; ), 1
Reference numeral 7 denotes a RAM-configured memory for storing data for arithmetic processing and arithmetic processing results, 18 a ROM-configured memory for storing control programs for the CPU 6, etc., and 19 an interface circuit for interfacing with an operating section 22 to be described later. be. Reference numeral 20 denotes an image display control unit that controls image signals sent to the CRT 21, and includes a refresh memory 20a for displaying a map, a refresh memory 20b for displaying travel tracks, cursors, etc., and memos for these.
and an image signal processing circuit 20c that combines or selects signals read out from 20a and 20b. In addition to the road map, the CRT 21 displays the driving trajectory, cursor, current position and its coordinates, etc. The operation unit 22 consists of several operation switches that control the content displayed on the CRT 21. Specifically, as shown in FIG. 3, there is a search switch 22a that searches for a road map area to be displayed, and Enlargement/reduction switch 22b for enlarging or returning to normal size, cursor switch 22c for moving cursor K, setting switch 22d for setting the current position of the vehicle and map number, resetting settings and erasing the travel trajectory. Clear switch 2 for
Consists of 2e. Note that the number S displayed on the screen is the coordinate of the point P determined by the cursor K.

The cassette tape 14a includes a narrow road 314 such as a side road that intersects with the main road 30;
As shown in Figure 5 for the 2Gs and Figure 6 for the river, only the intersections are symbolized and recorded so as to be loaded into the map display refresh memo 'J20a. Note that for narrow roads 31 such as side streets that intersect with main roads 30, the intersecting directions can be displayed in eight directions.

Now, in the traveling position display device described above, when the map data of a certain specific area is loaded from the cassette tape 14a to the map display refresh memory 20a, the seventh
As shown in FIG. 8, the road map (not shown in the figure) includes narrow roads 31 such as side streets that intersect with main roads 30, and railways 32.
, river 33 are symbolized and displayed on the CRT 2'l as shown in FIGS. 4-6.

Alternatively, map data with a large amount of information may be prepared, and the intersections where major roads intersect with side roads, railroads, rivers, etc. may be determined by calculation, and the intersections may be symbolized and displayed on the CRT.

As explained above, in the present invention, the map data is configured to symbolize and display only the intersections of narrow roads such as side streets that intersect with main roads, railways, rivers, etc. Even if you use a CRT with small dimensions, the road map will not be difficult to read, and the landmarks necessary to reach your destination, such as side roads, intersections, railroad crossings, viaducts, bridges, etc. will be displayed, so you will not make mistakes. This provides the advantage of being able to travel and reducing the amount of map data.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a traveling position display device according to the present invention;
FIG. 2 is a block diagram of a vehicle traveling position display device according to the present invention, FIG. 3 is a front view showing a map display section and an operation section of the display device, and FIGS. 4 to 6 are main points used in the present invention. An example of display symbols for narrow roads such as side roads that intersect with roads, railways, and rivers. Figure 7 is an example of a map that faithfully displays an actual scene on a travel position display device. Figure 8 is a travel position display according to the present invention. This is an example of a simplified map displayed in the device. 11... Orientation sensor 12... A/D converter 13.
...Distance sensor 14...Map data reading device 14a
...Cassette tape 15, 19...Interface circuit 16...CP
U 17 , 18...Memory 20...Image display control unit 20a...Map display refresh memory 20b...
°Display refresh memory 20c...Image signal processing circuit 21...CRT 22...Operation unit 22a...Search switch 22b...Enlargement/reduction switch 22c...Cursor switch 22d...Setting switch 22e... Clear switch 30... Main road 31... Narrow road 32... Railway 33... Patent applicant: Nissan Motor Co., Ltd. Agent Patent attorney Hiroshi Suzuki Male Figure 3 2 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A device that displays the vehicle's current position and vehicle travel trajectory calculated based on the vehicle's heading and travel distance together with a road map. A traveling position display device for a vehicle, characterized in that intersection parts are displayed with predetermined different symbols.