JP3349836B2 - Car navigation system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle navigation device, and more particularly to a CD-R storing map data of different scales.
The present invention relates to an in-vehicle navigation device that draws a map image around a vehicle position using map data of a certain scale read from a map data storage unit such as an OM or an IC memory card, and displays the map image on a display unit on a screen.

[0002]

2. Description of the Related Art A car navigation system includes a map data storage device such as a CD-ROM or an IC memory card storing map data, a display device, a vehicle position such as a GPS receiver, and the like, which detects a current position and a current direction of the vehicle. It has a detection device and the like, and maps data including the current position of the vehicle to a CD-R
Reads from the OM or the like, draws a map image centered on the vehicle position based on the map data, displays the map image on the display screen, fixes the vehicle position mark (location cursor) at the center of the display screen, and moves the vehicle. , The map image is scrolled and displayed, or the map image is fixed on the screen and the vehicle position mark is moved so that the user can see at a glance where the vehicle is currently traveling.

The maps stored in CD-ROMs and the like are 1/100000, 1/50000, 1/25000 from the smaller scale.
, 1/12500, etc., are divided into longitude and latitude widths of an appropriate size according to the scale level, and roads and the like are represented by a coordinate set of vertices (nodes) expressed in longitude and latitude. In addition,
A road is formed by connecting two or more nodes, and a portion connecting the two nodes is called a link. Map data includes
(1) Map matching including a road list, a node table, an intersection configuration node list, an intersection net list, etc., a road layer for route search, and (2) displaying roads, buildings, facilities, parks, rivers, etc. on a map screen. (3) Characters such as the names of administrative divisions such as municipalities, road names, and building names, and character / symbol layers for displaying map symbols and the like.

[0004]

By the way, in an on-vehicle navigation device, in addition to roads, buildings, facilities, parks, rivers, etc., in addition to a limited screen size, administrative division names, road names,
Although a large amount of map information such as characters such as building names and map symbols is displayed together with vehicle position marks, there is a problem that the map information is difficult to understand because the driver cannot gaze at the screen during traveling. Accordingly, it is an object of the present invention to provide an in-vehicle navigation device capable of displaying an easy-to-understand map image.

[0005]

According to the present invention, there is provided a map data storage means for storing map data,
Vehicle position detecting means for detecting a vehicle position and a vehicle direction; and map image drawing means for reading map data of a certain scale from the map data storage means, drawing a map image around the vehicle position, and displaying the map image on the display means on a screen. and in-vehicle navigation device, when drawing a map image around the vehicle position using the map data of the map image drawing unit some scale, car
If the speed is higher than the set speed , the center of the bottom of the screen is
While traveling in front of the vehicle and the road
Enlarge a simple map image consisting of roads to be inserted and give a sense of depth
Renders to have a, when the vehicle speed is equal to or less than the set speed, detailed land
Draw a figure and mark the vehicle position at a predetermined position on the screen.
Is achieved by drawing .

[0006]

According to the present invention, when the vehicle speed is equal to or higher than the set speed ,
While the center of the bottom of the screen is the current position,
Simple land consisting of a running road and a road intersecting the road
The image is enlarged and drawn with a sense of depth,
If the speed is lower than the set speed , a detailed map is drawn and
Draw a vehicle position mark at a predetermined position. Run like this
At the time of driving, it is a map image in front of the vehicle required by the driver on the screen
Enables display size to be enlarged
It is possible to present an easy-to-understand map image while using
Wear. Also, when traveling, it is located in front of the vehicle and from the current position
Only the primary or secondary reachable roads are large.
Display with a sense of depth
The map information is displayed with good visibility.
Of the association can be displayed as intuitively easy to perform, and further
The, this to be easily grasped current position on該地view image
Can be. Also , when driving at low speed or stopping, detailed map
And draw a vehicle position mark at a predetermined position in the screen.
draw. This makes it possible to operate at low speeds or when the vehicle is stopped.
Many maps around the vehicle position because divers can stare at the screen
It is convenient because information can be obtained.

[0007]

[0008]

[0009]

[0010]

FIG. 1 is an overall configuration diagram of a vehicle-mounted navigation device according to a first embodiment of the present invention. In the figure, reference numeral 1 denotes a CD-ROM storing map data composed of road layers, background layers, character / symbol layers, and the like for each scale, and 2 denotes a GPS for detecting a vehicle position, a vehicle direction, and a vehicle speed by satellite navigation. The receiver 3 is an operation unit for performing map enlargement / reduction operations and the like, and 4 is a display device for displaying a map image.

Numeral 10 denotes a navigation controller having a microcomputer structure, which draws a map image centered on the vehicle position together with a vehicle position mark while the vehicle is stopped using the map data stored in the CD-ROM 1 and causes the display device 4 to display the map image. During traveling, an enlarged map image in front of the vehicle is displayed on the display device 4 without a vehicle position mark while the center of the lower end of the screen is the vehicle position. 11 is CD-
A buffer memory 12 for storing map data read from the ROM 1 includes a vehicle position 12 and a vehicle traveling direction centered on the vehicle position while stopped, using map data of a scale set by a scale setting unit described later. Is drawn together with the vehicle position mark, and during traveling, the enlarged map image with the vehicle traveling direction facing upward while the vehicle is traveling is set so that the center of the lower end of the screen is the vehicle position without the vehicle position mark. This is a map image drawing unit for drawing. Reference numeral 13 denotes a video RAM for storing an image drawn by the map image drawing unit 12, and reference numeral 14 reads an image stored in the video RAM 13 and converts the read image into a predetermined video signal.
Is a video conversion unit that outputs the image data.

A discriminating unit 15 for discriminating whether the vehicle is stopped or running from the vehicle speed data input from the GPS receiver 2;
Reference numeral 16 denotes a scale setting unit that sets a scale D specified by the user by a map enlargement / reduction operation on the operation unit 3.

FIG. 2 is a flowchart showing the operation of the navigation controller 10, and FIG. 3 is an explanatory diagram of a screen display example.
Hereinafter, description will be made with reference to these figures. When the power is turned on, the GPS receiver 2 periodically determines the vehicle position by satellite navigation,
Car direction and speed are detected. On the other hand, after turning on the power of the navigation controller 10, after the scale setting unit 16 initializes the scale D to 1 / 12,500 (step 101 in FIG. 2), the vehicle position data, the vehicle azimuth data, and the vehicle speed data are transmitted from the GPS receiver 2. Is input, and the map image drawing unit 1
2 reads the map data of the scale D around the vehicle position from the CD-ROM 1 to the buffer memory 11 (step 10).
2, 103).

Thereafter, the determining unit 15 determines whether the vehicle is stopped or running from the vehicle speed detected by the GPS receiver 2 (step 104). Here, in consideration of the speed detection error, if the vehicle speed is, for example, 5 km / h or less, it is determined that the vehicle is stopped, and if the vehicle speed is greater than 5 km / h, the vehicle is running. If the vehicle is stopped, the map image drawing unit 12 uses the map data of the reduced scale D previously read into the buffer memory 11 to store a map image with the vehicle position as the center and the vehicle traveling direction upward in the video RAM 13. Draws a vehicle position mark with the vehicle traveling direction directed to the center (step 10).
5, 106). The image in the video RAM 13 is stored in the video converter 1
4 and converted into a predetermined video signal and output to the display device 4 (step 107). As a result, the screen displays all roads, buildings, facilities, etc. within a fixed distance around the vehicle position, as well as characters such as road names, administrative division names, and map symbols (see FIG. 3A). When the vehicle is stopped, the driver can stare at the screen, so that much map information around the vehicle position can be obtained, which is convenient.

After step 107, the navigation controller 10 checks whether or not the scale setting unit 16 has performed a map enlargement / reduction operation using the operation unit 3 (step 10).
8) If NO, vehicle position data, vehicle azimuth data, and vehicle speed data are input from the GPS receiver 2 (step 109). Then, the map image drawing unit 12 checks that the vehicle position has changed (step 110). If it has not changed, the process returns to step 108, and if it has changed, the processing from step 103 onward is repeated.

Thereafter, when the vehicle starts running and the vehicle position changes, the result of step 110 is YES, and the map image drawing section 12 reads out the scale D map data including the new vehicle position from the CD-ROM 1 to the buffer memory 11. (Step 103). Next, the determining unit 15 determines whether the vehicle is stopped or running (step 104).
When it is determined that the vehicle is traveling above km / h, the map image drawing unit 12 uses the map data of the reduced scale D previously read into the buffer memory 11 while moving the lower end center of the video RAM 13 to the vehicle position. A video RAM 1 displays an enlarged map image (up to twice the magnification) with the direction facing up.
3 (step 111). At this time, the vehicle position mark is not drawn. The image in the video RAM 13 is read by the video converter 14, converted into a predetermined video signal, and output to the display device 4 (step 107).

As a result, an enlarged map image in front of the vehicle is displayed on the screen (see FIG. 3 (2)), so that an easy-to-understand map image can be presented while effectively using the display size of the screen. Even if the driver cannot gaze at the screen while driving, it is possible to easily visually recognize map information in front of the vehicle which is particularly necessary during driving. In addition, since the center of the lower end of the screen is the vehicle position, the current position on the map image can be easily grasped.

When the driver changes the scale of the map, the scale setting unit 16 of the navigation controller 10 changes the scale D in accordance with the operation (step 1).
12). For example, when a reduction operation is performed, the scale D is set to 1/25.
Set to 000. Therefore, hereafter, a map image with a scale of 1/25000 centering on the vehicle position is displayed on the screen while the vehicle is stopped, and the vehicle position is set at the center of the lower end of the screen during driving.
An enlarged map image of 0 is displayed.

FIG. 4 is an overall configuration diagram of a vehicle-mounted navigation device according to a second embodiment of the present invention. The same components as those in FIG. 1 are denoted by the same reference numerals. In the first embodiment, all the map information included in the map data such as roads, buildings, facilities, parks, etc., characters such as road names and administrative division names, and map symbols are drawn and displayed during traveling. However, in the second embodiment, the traveling road and the road intersecting the road are displayed without being enlarged.

In FIG. 4, reference numeral 17 denotes a road extracting unit.
Referring to the road layer and the current vehicle position in the scale D map data read by the map image drawing unit 12A from the CD-ROM 1 to the buffer memory 11, the data of the currently traveling road and the road intersecting with the road are obtained. Extract. When the determination unit 15 determines that the vehicle is stopped, the map image drawing unit 12A shown in FIG.
As shown in (1), using the map data of the reduced scale D, a map image centered on the vehicle position and the vehicle traveling direction is directed upward is drawn on the video RAM 13, and a vehicle position mark is also drawn. Conversely, when the determining unit 15 determines that the vehicle is traveling, the map image drawing unit 12A uses the road data extracted by the road extracting unit 17 to set the center of the lower end of the video RAM 13 to the vehicle position and to make the vehicle traveling direction upward. A map image consisting of only roads is drawn on the video RAM 13, and no vehicle position mark is drawn. The other components are configured exactly the same as in FIG.

According to the above-described second embodiment, as shown in FIG. 5A, while the vehicle is running, the screen is present in front of the vehicle and is currently running and the road intersecting with the road. Only a wide range of roads that can be reached primary or secondary from the current position can be displayed, and a wide range of map information can be presented with minimum visibility with good visibility. Since the position is used, the current position on the map image can be easily grasped.

As a modification of the second embodiment, FIG.
As shown in (2), a map image consisting of only roads having a three-dimensional depth by means of perspective transformation or the like is attached to roads, and correspondence between roads on the map image and actual roads is drawn. The attachment may be easily and intuitively performed. Also, when the map image drawing unit 12A draws a map image consisting of only roads during traveling, the road image is enlarged twice as shown in FIG. In this case, FIG.
The depth may be provided as shown in (2).

[0023]

According to the present invention, as described above, during traveling, luck on the screen
Only the map image in front of the vehicle required by the driver is enlarged and displayed.
Can be displayed, making effective use of the screen display size.
It is possible to present an easily illuminated map image. Also book
According to the invention, when traveling, the vehicle exists in front of the vehicle, and
Only the primary or secondary reachable roads are larger,
In addition, since it is displayed with a sense of depth, the minimum required
Roads on the map image and actual roads with good visibility of map information
Can be displayed so that it can be easily and intuitively associated with ,
Furthermore , the user can easily grasp the current position on the map image.
be able to. Also , according to the present invention, when driving at low speed or
Indicates a detailed map when stopped, and a predetermined position on the screen.
The vehicle position mark is drawn on the
When the vehicle is stopped, the driver can stare at the screen,
A lot of map information can be obtained, which is convenient.

[0024]

[0025]

[0026]

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a vehicle-mounted navigation device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the navigation controller.

FIG. 3 is an explanatory diagram showing a screen display example.

FIG. 4 is an overall configuration diagram of a vehicle-mounted navigation device according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a screen display example.

FIG. 6 is an explanatory diagram showing a screen display example according to a modification of the second embodiment.

[Explanation of symbols]

 Reference Signs List 1 CD-ROM 2 GPS receiver 3 Operation unit 4 Display device 10 Navigation controller 11 Buffer memory 12, 12A Map image drawing unit 13 Video RAM 14 Video conversion unit 15 Judgment unit 16 Scale setting unit 17 Road extraction unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01C 21/00-21/36 G08G 1/0969 G09B 29/00-21/10

Claims (1)

(57) [Claims] 1. Map data storage means for storing map data, vehicle position detection means for detecting a vehicle position and a vehicle orientation, and map data of a certain scale are read out from the map data storage means to generate a map image around the vehicle position. In a vehicle-mounted navigation device having a map image drawing means for drawing and displaying a screen on a display means, when the map image drawing means draws a map image around a vehicle position using map data of a certain scale, the vehicle speed is reduced. If the speed is higher than the set speed , the center of the lower end of the screen is the current position
And the road currently running ahead of the vehicle and the road
A simple map image consisting of intersecting roads with a sense of depth
Drawn, when the vehicle speed is equal to or less than the set speed, along with drawing a detailed map
An on- vehicle navigation device , wherein a vehicle position mark is drawn at a predetermined position in a screen .