JP2702742B2 - Navigation device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation device that outputs guidance information according to a course set before traveling, and more particularly to a navigation device that displays an intersection mark of a set course. About.

[Conventional technology]

2. Description of the Related Art In recent years, a navigation system that guides a driver on a course according to a course set before traveling has been actively developed.

FIG. 17 is a view for explaining a conventional example of a navigation device, wherein 1 indicates a course, 2 indicates an automatic position, and 3 indicates a destination position. The conventional navigation device displays a map on the CRT screen when indicating a preset course, and displays the automatic position 2 and the course 1, the destination position 3 and the running locus up to that on the map. Was to do. However, there is a problem that it is difficult for a driver to understand a map or course information displayed on a small CRT screen, and it is particularly difficult to recognize a traveling direction at an intersection.

For that purpose, JP-A-61-190698, JP-A-62-5100
In No. 0 publication, information on the direction and width of each road extending from each intersection is stored, and for a route that has been automatically set in advance, the direction of the road extending from the intersection to be guided is read, In addition, the direction in which the vehicle travels at the intersection is determined, and an intersection diagram displaying the intersection shape with the traveling direction upward and drawing data of the arrow of the traveling direction are created.
The intersection shape and the arrow are displayed based on the drawing data.

[Problems to be Solved by the Invention] However, in the above-described conventional method of drawing an intersection diagram, since the intersection diagram is information of only roads, it is difficult to confirm at the intersection and it is difficult to understand the traveling direction. Have. Therefore, it is conceivable to display an intersection mark of a gas station, a bank, or the like as image data in the image data of the intersection diagram, and to display the shape of the intersection in the intersection diagram with the traveling direction upward, There is a problem that the landmarks are oblique or upside down, and they are misidentified. In addition, it is necessary to have image data for each approach road to each intersection, resulting in a huge amount of data storage. have.

An object of the present invention is to solve the above-described problem, and an object of the present invention is to provide a navigation device that can easily display an intersection mark on an intersection diagram in which an intersection shape is displayed with the traveling direction facing upward.

[Means for Solving the Problem] For this purpose, a navigation device according to the present invention provides a navigation device that displays an intersection diagram when approaching a guidance intersection on a route according to a preset route. Storage means for storing information relating to the connection relationship and position of the intersection, and information relating to the position and display of the intersection mark corresponding to each intersection, and information relating to a guidance intersection to be displayed and a road connecting to the intersection based on a preset route. Data processing for reading information from the map data and drawing the shape of the intersection of the guide intersection based on the read information and information on a preset route, with the direction of travel to the guide intersection on a display screen. Control means, and display means for displaying the drawn intersection shape as an intersection diagram. The data processing control means reads information on the position and display of the intersection mark corresponding to the guidance intersection from the storage means,
The drawing position of the intersection mark in the intersection shape of the guidance intersection is specified and drawn together with the intersection shape, and the display means displays the intersection mark together with the intersection shape as an intersection diagram.

[Functions and Effects of the Invention] In the present invention, since the shape of the intersection can be displayed with the traveling direction upward in the intersection diagram, and the intersection mark can be displayed without the angle being oblique or inverted. It is possible to obtain accurate information according to the approach direction to the intersection, and to separately store information on the shape of the intersection, such as data on roads and intersections, and information on the intersection landmarks in the map data. Is used to draw the intersection diagram, so that when a mark is drawn on the intersection diagram, data can be given irrespective of the approach direction to each intersection, and the advantage that the data storage amount is small is achieved. Have.

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

FIG. 2 is a diagram showing one embodiment of a system configuration of a navigation device to which the present invention is applied.

In FIG. 2, reference numeral 11 denotes a distance meter, 12 denotes a steering angle meter, 13 denotes an input unit, 14 denotes an input decoding unit, 15 denotes an input decoding table, 16 denotes a data processing control unit, 17 denotes an image output control unit, and 18 denotes a display. Department, 21,
23 indicates a file. In the following description, a course is
The route on which the vehicle is guided.

The distance meter 11 measures the traveling distance of the vehicle,
For example, one that detects and counts the rotation of a wheel, one that detects acceleration and integrates twice, and the like may be used, but other measuring means may be used.

The rudder angle meter 12 detects whether the vehicle has turned at an intersection.For example, an optical rotation sensor or a rotation-type resistance volume attached to a rotating portion of a steering wheel can be used. An attached angle sensor may be used.

The input unit 13 may be a joystick, a key, or a touch panel, or may be a unit that is combined with a screen of the display unit 18 to display a key or a menu on the screen and input from the screen.

The input decryption unit 14 is for decrypting the data input from the input unit 13 while referring to the input decryption table 15,
For example, when a course is set, when a current position or a destination is input by a code, the code is converted into current position data or destination data by referring to the input decoding table 15. Therefore, the input decryption table 15
Is set in accordance with data to be input from the input unit 13 and data to be input.

The data processing control unit 16 is the center of the navigation device. When the current location and the destination are set from the input unit 13, the data processing control unit 16 calls and executes the navigation program of the course stored in the file 21. Each navigation program sets a course, displays a road map on the screen of the display unit 18 along a running course,
It is configured to display a route guidance screen for an intersection to be turned and to display remaining distance to the intersection and other guidance information. The file 23 stores road data, intersection data, and intersection mark data for that purpose as map data, and the image output control unit 17 controls output of an image to the display unit 18.

In the above navigation system, the input unit 13
Enter the current location and destination from the
16 reads out the navigation program corresponding to the course from the file 21 and executes it.

The navigation program calculates the position of the vehicle based on the measurement information from the distance meter 11 and the rudder angle meter 12 according to the course, and displays the course guide map and the current location through the display unit 18 and the speaker 20, and features during the passage. Guidance of things, guidance of intersections, etc. are performed. For example, in the middle of a course where the distance to the next intersection is long, in order to give the driver a sense of security that the driver has not deviated from the course, or to display a photograph of a feature passing through on the screen. Alternatively, a guide map and the position of the own vehicle are displayed to inform the traveling position on the course. Then, when the intersection is near, the intersection is drawn and output as described above.

FIG. 1 shows a display screen output by the intersection drawing method of the navigation device of the present invention. On this screen, the traveling direction to intersection 5 is displayed so as to be vertical,
A turning arrow 6 and a gas station or bank, which is an intersection mark 7, are displayed.

Next, a drawing method for outputting the display screen will be described. First, the data structure will be described with reference to FIGS.

FIG. 3 shows an intersection connected to the intersections. Hereinafter, an example of drawing a map near the intersection and an intersection mark GS (gas station) will be described. Road numbers 1 to 6 are assigned to the road connecting the intersection and the intersections 1 to 6 for the outbound and return routes, respectively.

FIGS. 4 and 5 show information on the connection relations and positions of intersections and roads, and FIG. 4 shows the contents of the intersection number data. For each intersection number, position coordinates of east longitude and north latitude are set. In addition, according to the relationship shown in FIG. 3, the smallest number of the outgoing roads and the incoming roads, the number of outgoing roads, and the number of incoming roads are set. The intersection mark pointer indicates the head address in the memory where the intersection mark data is stored.

FIG. 5 shows the contents of the road number data. For each road number, the intersection number of the start point and the end point, the road number having the same start point, and the road number having the same end point are set according to the relationship of FIG. ing. The node sequence pointer indicates the address of the memory where the first node of the node sequence on the road is stored. Here, the node row indicates a plurality of position coordinates arranged in a row on the road.

6 and 7 show information on the position and display of the intersection mark corresponding to each intersection, FIG. 6 shows the contents of the intersection mark data, and, for the intersection mark pointer designated in FIG. The number of landmarks and the position coordinates (east longitude, north latitude) of the center position of the landmark are stored.

FIG. 7 shows a file of the landmark pattern numbers, in which image data of banks, gas stations and the like is stored as matrix data of 24 × 24 dots for each landmark pattern number. Note that this image data may be stored in a character code.

FIG. 8 shows the map data, and shows the node string data corresponding to each road number designated by the node string pointer in FIG. 5. The number of nodes and the coordinates (east longitude, north latitude) of the node strings are shown in the order of the road numbers. Is stored.

Next, a method of drawing an intersection using map data will be described.

In FIG. 9, first, in step 101, a rotation coefficient is set to display an intersection with the traveling direction upward, and the map coordinates are enlarged from the map coordinates to the drawing screen coordinates so that the display range is, for example, 200 m square. Set the expansion factor to perform In step 102, the guide intersection number is set in the drawing intersection list, and the intersection list pointer DP is set to 0.
And the intersection list number N is set to 1. And step
At 103 to 106, a road that exits from an intersection and a road that enters an intersection are drawn. At step 107, an arrow indicating a traveling direction is drawn. At step 108, an intersection mark is drawn.

In the following description, it is assumed that guidance is given in FIG.

Expansion coefficients of Figure 10 is the previous figure step 101, shows a flow of setting processing of the rotation factor, the guidance intersection positions node on the guide route node series at step 111 the coordinate (x _0, y ₀₎ than a predetermined distance starting point side The coordinates (x ₁ , y ₁ ) are obtained, and
The angle θ between the straight line connecting the points and the y-axis (FIG. 11) is defined as the rotation angle. In step 113, an enlargement coefficient is obtained from [drawing screen range (number of dots on the screen)] / [drawing target range (second) on a predetermined map], and in step 114, the coordinates (x ₀ , y ₀ ) of the guidance intersection position node ) Is the center coordinate on the map.

FIG. 12 shows the flow of the process of drawing the road exiting from the intersection in step 104 of FIG. Step 115
Then, the first road number 1 of the intersection number 1 is read from the intersection file (FIG. 4). In step 116, the first road number and the road number are set to 1. Since this is the first time in the loop, in step 118, the start intersection 1 and the end intersection 2 of the road number 1 are read. In step 119, it is determined whether or not the start point intersection 1 and the end point intersection 2 are registered in the drawn intersection list. Register Step 121, 1
At 22, the node sequence for road number 1 (135.5, 35.
5, 135.4, 35.4) are read, and the node sequence is converted into coordinates on the drawing screen using the above-described rotation coefficient and enlargement coefficient, and drawn. If the intersection 2 is not in the drawing range in step 123, the intersection 2 is registered in the intersection list, and the intersection list number N is incremented. In step 125, the next road number 3 having the same starting point with respect to road number 1 is read from the road file (FIG. 5) as a road number, and the processing of steps 117 to 125 is repeated to repeat the road numbers 1, 3, 5
To draw.

FIG. 13 shows the flow of the drawing process of the road entering the intersection in step 105 of FIG. This processing is the same as that in the previous figure, and the description is omitted.

FIG. 14 shows the flow of the drawing process in the traveling direction in step 107 of FIG. This will be described with reference to FIG. 15. First, the node sequence 35 is drawn in the drawing area from the guidance intersection node of the guide route node sequence in the starting point direction, and the boundary of the drawing region is drawn from the guidance intersection of the guidance route node sequence in the end direction. The node row 36 is drawn by subtracting the size of the arrow from the line, and finally the head 37 of the arrow is drawn by rotating in the direction to the last drawn node position.

FIG. 16 shows the flow of the intersection mark drawing process in step 108 of FIG.

First, in step 151, a mark pattern number and a mark position are read out from the intersection mark pointer (FIG. 4) of the guidance intersection by the number of intersection marks in FIG. In step 154, a mark pattern corresponding to the i-th mark number is read from the mark pattern file (FIG. 7), and in step 155, the i-th mark coordinate is converted into a drawing screen coordinate by an enlargement and a rotation coefficient at the time of drawing the intersection diagram. Then, a mark pattern is drawn at the screen coordinates calculated in step 156 (FIG. 15). Thereafter, the above processing is repeated by the number of marks.

Note that the present invention is not limited to the above embodiment, and various modifications are possible.

For example, in the above embodiment, the intersection diagram is automatically created, but the invention is not limited to this. The intersection diagram is stored in several patterns, and the intersection mark is drawn on the intersection pattern. You may.

As is apparent from the above description, according to the present invention, the intersection mark of the intersection is automatically drawn and displayed on the screen without having the image data as the map of the intersection, so that the driver can be provided with a little The information necessary for the course driving can be given accurately even in a short time, and the driver can be given a sense of security.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining one embodiment of a navigation device according to the present invention, FIG. 2 is a diagram showing one embodiment of a system configuration to which the navigation device of the present invention is applied, and FIG.
8 are diagrams for explaining road data and map data, FIG. 3 is a diagram showing an example of an intersection, FIG. 4 is intersection number data, FIG. 5 is road number data, FIG. 7 and 8 show intersection mark data, and FIG. 8 shows node row data. FIG. 9 is a flow chart for drawing an intersection diagram, FIG.
Fig. 11 is a flowchart of drawing enlargement and rotation coefficient setting. Fig. 11 is a diagram for explaining the operation. Fig. 12 is a flowchart of drawing processing of a road coming out of an intersection. FIG. 14 is a flowchart of a drawing process in a traveling direction, FIG. 15 is a diagram for explaining a screen display example, FIG. 16 is a flowchart of a drawing process of an intersection mark, and FIG. It is a figure for explaining the guidance screen of. 5 ... intersection, 6 ... traveling direction arrow, 7 ... intersection mark, 11 ... distance meter, 12 ... steering angle meter, 9 ... guidance route, 13
…… Input unit, 14 …… Input decoding unit, 15 …… Input decoding table, 16 …… Data processing control unit, 17 …… Image output control unit,
18… Display unit, 21… Navigation program, 23…
… Map data.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Mitsuhiro Nimura 10 Takane, Fujii-cho, Anjo-shi, Aichi Prefecture Inside Aisin AW Co., Ltd. (56) References JP-A-59-206710 (JP, A) JP-A-62-501650 (JP, A) JP-A-61-213718 (JP, A) JP-A-61-181914 (JP, A) JP-A-62-284212 (JP, A)

Claims (5)

(57) [Claims] 1. A navigation device for displaying an intersection diagram when approaching a guidance intersection on a route in accordance with a preset route, wherein the map data corresponds to information on connection relations and positions of intersections and roads and each intersection. Storage means for storing information on the position and display of the intersection mark; information on a guidance intersection to be displayed and a road connected to the intersection based on a preset route, from the map data; Data processing control means for drawing the shape of the intersection of the guidance intersection with the traveling direction to the guidance intersection upward on the display screen based on the information on the route set in advance, and displaying the drawn intersection shape as an intersection diagram Display means for displaying, wherein the data processing control means comprises an intersection corresponding to the guidance intersection. Information on the position and display of the mark is read from the storage means, the drawing position of the intersection mark in the intersection shape of the guidance intersection is specified and drawn together with the intersection shape, and the display means displays the intersection mark with the intersection shape as an intersection diagram. A navigation device characterized by displaying. 2. The navigation apparatus according to claim 1, wherein the information on the display of the intersection mark stored in the storage means is stored as image data of the intersection mark. 3. The navigation device according to claim 1, wherein the information on the position of the road stored in the storage means includes node data for expressing the shape of the road. 4. The data processing control means converts the shape of the intersection into coordinates of a drawing screen to be drawn based on the information on the connection relations and positions of the intersections of the guide intersections and the roads and draws. Item 4. The navigation device according to item 1. 5. The data processing control means according to claim 1, wherein the intersection shape is converted into coordinates on a drawing screen to be drawn based on information on the position of the intersection mark corresponding to the intersection, and the data is drawn. Navigation device.