JP3452906B2 - Car navigation system - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to a vehicle navigation apparatus that indicates display the current position of the road map and <br/> vehicle on a display device.

[0002]

2. Description of the Related Art A vehicle-mounted navigation device that displays a route to a destination and a vehicle position on a road map around the vehicle and guides an occupant to the destination has been put into practical use (for example, a manual for new Nissan vehicles). Y32-1 June 1991). This type of navigation device detects the current position of the vehicle, extracts the information around the vehicle from the road map information, and displays a mark indicating the current position and the name of the main target on the road map around the vehicle. is doing.

Further, a vehicle-mounted navigation device has been proposed which simply displays only a route to a destination and information around the route (see, for example, Japanese Patent Laid-Open No. 2-57910). This navigation device extracts only the travel route to the destination from the road map information and the information around the route, expands and contracts and rotates the route map, and sets the traveling direction of the vehicle to the heaven direction on the display screen. Is displayed.

[0004]

[SUMMARY OF THE INVENTION However, the in-vehicle navigation system of the former described above, since the display more information Viewing the screen, there is a problem that viewing the information needed at a glance hesitation . Further, the latter vehicle-mounted navigation device has a problem that it is inconvenient because road map information other than the route to the destination is not displayed.

An object of the present invention is to provide a vehicle navigation apparatus that visibility is improved.

[0006]

Solution the problem according to the present invention, in order to solve the problems]
One example of the means for determining is to display two types of displays on the display device.
I have been there. Specific contents will be described in Examples.

[0007]

1 and 2 show the configuration of a navigation device according to an embodiment. This device is C
It is composed of a microcomputer centered on PU1. The CPU 1 exchanges data with various devices via the system bus 2 to perform various arithmetic processes. Three
Is a heading sensor for detecting the heading of the vehicle, and is connected to the system bus 2 via the amplifier 4, the A / D converter 5 and the I / O controller 6. A vehicle speed sensor 7 generates a predetermined number of pulse signals per revolution of the output shaft of the transmission, and is connected to the system bus 2 via the I / O controller 6. The CPU 1 counts and integrates the pulse signals to calculate the traveling distance of the vehicle and the vehicle speed from the number of pulses per unit time. Reference numeral 8 is a key for inputting various commands and data to the device, which is connected to the system bus 2 via the I / O controller 9. The key 8 includes a touch switch provided on the surface of the CRT. Reference numeral 10 denotes a sound output speaker, which includes a sound generator 11 and I / O.
It is connected to the system bus 2 via the controller 9.

A receiver 12 (hereinafter referred to as a GPS receiver) for receiving GPS signal radio waves is connected to the system bus 2 via an expansion I / O controller 13.
The current position of the vehicle is the position information from the GPS receiver 11, the traveling direction information of the vehicle from the direction sensor 3,
And CP based on the traveling distance information from the vehicle speed sensor 7.
It is calculated by U1. Further, 14 is a receiver equipped with an antenna 15, and receives road traffic information and position information such as traffic congestion, road construction, traffic regulation, etc. from road beacons installed at roads and intersections.

In FIG. 2, reference numeral 16 is a CD-ROM storing road map data, which is an interface SC.
It is connected to the system bus 2 via the SI controller 17. 18 is a VDT (Visual Display)
It is a CRT that functions as a terminal, is connected to the system bus 2 via the graphic controller 19, displays a road map around the vehicle, and displays a mark indicating the current position of the vehicle on the road map.
A touch panel is provided on the surface of the CRT 18, and when a finger or the like touches an item displayed on the screen, the touch switch of the key 8 corresponding to the item is turned on.
Further, the system bus 2 has a V-RAM 20 for image storage of the CRT 18, a ROM 21 for storing a control program described later, a D-RAM 22 for temporary storage of data, a kanji ROM 23, and a battery backup for storing the current position when the ignition is off. RAM 24 is connected.

Here, the road map data will be described. The road map is managed by dividing the whole country into small sections (hereinafter referred to as regional meshes) defined in JIS-X0410, and the CPU 1 reads out a required range of road maps in units of regional meshes. In addition, the road map is dataized as a collection of nodes indicating roads such as intersections and bends, and straight lines connecting the nodes, that is, links, and position coordinates and attribute information of each node and each link. It is stored with. This attribute information includes
It includes road types such as highways, national roads, and general roads, connection information for each intersection and each road, information about major facilities such as stations around the road, hotels, and public offices.

Next, the road map displayed on the CRT 18 will be described. FIG. 3 shows a display example of the CRT 18. CR
A normal road map is displayed in the display area 31 of T18. Here, the normal road map is, for example, a road map of a scale of 1 / 1.25 million to 1 / 200,000, and CRT1
The display area 31 of 8 is displayed at the reduced scale. FIG. 3 shows a display example of a road map from Ichikawa to Chiba Station to the destination, Narita, and 33a is a mark indicating the current position of the vehicle.
Reference numeral 4 is a guide route to the destination.

On the other hand, the display area 32 of the CRT 18 displays a map in which main targets on the guide route, that is, intersections, interchanges, service areas, ramps, etc. are arranged on a straight line. In this specification, the display area 31
The normal road map displayed in Fig. 3 is called a detailed map, while the map displayed in the display area 32 is called a route map. This route map shows the guide route 3 in the detailed map display area 31.
4 is displayed as a straight line, and the route 34
The name of the main target object above is arranged on the straight line and displayed with the mark 33b indicating the current position of the vehicle as the center.
In the display example shown in FIG. 3, the name of the intersection between Chiba Station and Miyakomachi on the guide route 34 is displayed. Here, if there are many main targets on the guide route, displaying all of them will make it a map that is hard to see at a glance like a detailed map,
You have to sort out the main targets to be labeled in some way. For example, depending on the type of main target, prioritize such as interchange>ramp> intersection,
Select the main targets to be displayed according to the scale of the detailed map.

The name of the main target object on the route map is displayed at a position proportional to the distance from the current position of the vehicle along the actual guide route 34 to the main target object. In this display example, the current position 33b of the vehicle in the route map
To the display position of the name of Chiba Station and Miyakomachi is proportional to the distance from the current position 33a of the vehicle on the detailed map to the intersection of Chiba Station and Miyakomachi via the guide route 34.
The distance to the point may be displayed at the display position of the name of the main target object. Further, the distance from the current position to the destination may be displayed in the display area 32 of the route map.

Display area 3 of the route map on the surface of the CRT 18
2 is provided with a touch panel, and touch switches of keys 8 are arranged in a grid pattern having a predetermined pitch. The name of the main target displayed on the route diagram is used as a push button of these touch switches, and when a finger or the like is touched on the name display position of the main target, an enlarged view of the target or detailed information (below, The target information) is displayed on the CRT 18. For example, if you touch the display position of Chiba Station in the route map shown in FIG. 3, instead of the detailed map and route map, a detailed map of the intersection in front of Chiba Station as shown in FIG. , Target information such as the distance to the intersection is displayed. It should be noted that when the target object information is detected as having passed the point, when a predetermined display time has elapsed, or when the cancel button 35 is pressed, FIG.
Return to the detailed map and route map display shown in.

5 and 6 are flowcharts showing an example of the control program of the CPU 1. The operation of the embodiment will be described with reference to these flowcharts and the display examples of the CRT 18 shown in FIGS. When a power switch (not shown) of the navigation device is turned on, the CPU 1 starts executing this control program. In step S1, initial settings such as the current position of the vehicle and the destination input by the key 8 are performed. In addition, when the current position of the vehicle is not set, the position of the vehicle immediately after the previous traveling stored in the backup RAM 23 is read out, and the current position of the vehicle is changed to D-.
It is stored in the RAM 22. In step S2, road map data from the current position of the vehicle to the destination is read from the CD-ROM 16 and stored in the D-RAM 22. At this time, if the destination is far and the data amount exceeds the predetermined value, the data is divided appropriately and the data around the vehicle is read first. In a succeeding step S3, a route search from the current position to the destination is performed to set an optimum guide route, and the route is stored in the D-RAM 22.
Note that various methods have been proposed for route search and are already known, so detailed description thereof will be omitted.

In step S4, the position coordinates of each node and each link of the road map data around the vehicle are converted into the scale of the set detailed map, and the data that can be displayed in the display area 31 of the CRT 18 is extracted. In the following step S5, the extracted road map data is converted into image data and displayed on the display area 31 of the CRT 18 via the graphic controller 19. At this time, as shown in FIG. 3, the mark 33a is displayed at the current position of the vehicle, and the guide route 34 to the destination is displayed with a thick line.

In step S6, the display range of the route map is determined. That is, the entire range of the guide route 34 displayed in the detailed map display area 31 is set as the route map display range. Furthermore, in step S7, the guide route 34 in the display range is displayed.
From the main targets above, decide which one should be displayed on the route diagram. Here, as shown in FIG. 3, the intersection between Chiba station and Miyakomachi on the guide route 34 in the display area 31 of the detailed map is determined as the target object to be displayed. Next, in step S8, the display position of the target to be displayed is determined. That is, the distance from the current position of the vehicle to the display target via the guide route 34 is calculated based on the road map data in the display area 31 of the detailed map, and the vehicle is set at the substantially vertical center of the route map. Current position mark 33b
The display position is determined so that the distance from to the name of each display target is proportional to the actual distance. In step S9, image data is generated based on the name of the display target and its display position data, and the route diagram is displayed in the display area 32 of the CRT 18 via the graphic controller 19.

Next, in step S15 of FIG. 6, the current position of the vehicle is calculated based on the traveling distance, traveling direction, GPS signal, etc. of the vehicle, and in the following step S16, it is determined whether or not the vehicle has moved. When the vehicle moves, step S17
If not, the process returns to step S4 in FIG. In step S17, it is determined whether or not the vehicle has arrived at the destination. When the vehicle arrives, the execution of the program is terminated. If not, the process proceeds to step S18. In step S18, it is determined whether the vehicle is on the guide route 34 and the guide route 34
If it is above, it returns to step S4 of FIG. 5, and if it is not on the guide route 34, the execution of the program is ended.

FIG. 7 shows an interrupt routine for displaying the target object information. CRT18 route map display area 3
When the touch switch of the key 8 provided in 2 detects that one of the display targets is touched, CP
An interrupt is generated in U1, and the CPU 1 executes this target object display routine. In step S21, the D-RAM 22
The road map data read out in step S22 is searched for data relating to the designated target object, and in the subsequent step S22, the image data of the detailed map and route map currently displayed on the CRT 18 is stored in the V-RAM 20, and the CRT 18 is stored. Delete the map display screen of. In step S23, the data regarding the designated target is converted into image data, the target information as shown in FIG. 4 is displayed on the CRT 18, and the display timer is started.

In step S24, it is determined whether or not the cancel button 35 is pressed by the key 8. If the cancel button 35 is pressed, the process proceeds to step S26, and if not, the process proceeds to step S25. In step S25, it is determined whether or not the displayed target object has passed, and if it has passed, the process proceeds to step S26, and if not, the process proceeds to step S27. In step S27, it is determined whether or not the display timer has timed out and a predetermined display time has elapsed, and if the predetermined time has elapsed, the process proceeds to step S26, and if not, the process returns to step S24. The target information being displayed is erased in step S26, and the detailed map and route map stored in the V-RAM 20 are re-displayed in the CRT 18 in step S28.
To display.

[0021] Thus, by dividing the display screen of CRT18 into two display regions 31 and 32, and displays the detailed map displaying vehicle <br/> current land 33a, a guidance route 34 in the display area 31, the display The guide route 34 is represented by a straight line in the area 32, and the current position 33b of the vehicle and the main target existing on the guide route 34 in the display area 31 of the detailed map are arranged on the straight line.
Since the route map is displayed, you can check the road map information other than the guide route on the detailed map without switching the display screen, and you can see the guide route and the surrounding information at a glance on the route map. . In addition, display area 3 of the route map
2 is equipped with a touch switch, and when the touch switch corresponding to the displayed main target is operated, the CRT 18
I deleted the detailed map and route map displayed in to display detailed information about the main target.
Information about major targets on the guide route can be easily retrieved. Further, since the current position 33b of the vehicle and each main target object in the route diagram are displayed at a position proportional to the distance along the actual guidance route 34, the positional relationship between the current position and each main target object can be seen at a glance. Can be grasped at.

The display area of the detailed map and route map on the CRT is not limited to the above-mentioned embodiment. Further, the display form and the display content of the target object information are not limited to the above-described embodiment.

In the configuration of the above embodiment, the CD-RO
M16 is a storage means, CRT18 is a display means, CPU
1 constitutes a display control means.

[0024]

As described above, according to the present invention, the visibility of the vehicle-mounted navigation device can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment.

FIG. 2 is a block diagram showing the configuration of an embodiment.

FIG. 3 is a diagram showing a display example of a detailed map and a route map.

FIG. 4 is a diagram showing a display example of target object information.

FIG. 5 is a flowchart showing an example of a display processing program for displaying a road map and a route map.

FIG. 6 is a flowchart showing an example of a display processing program for displaying a road map and a route map.

FIG. 7 is a flowchart showing a target object information display processing routine.

[Explanation of symbols]

1 CPU 2 system bus 3 Direction sensor 4 amplifier 5 A / D converter 6,9 I / O controller 7 vehicle speed sensor 8 keys 10 speakers 11 sound generator 12 GPS receiver 13 Extended I / O 14 receiver 15 antenna 16 CD-ROM 17 SCSI controller 18 CRT 19 Graphic controller 20 V-RAM 21 ROM 22 D-RAM 23 Kanji ROM 24 Backup RAM 31, 32 display area 33a, 33b Current position mark 34 Guide route 35 Cancel button

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Sobe 1-280, Higashi Koigakubo, Kokubunji City, Tokyo Inside Design Research Laboratory, Hitachi, Ltd. (72) Inventor, Koichi Umezawa 1-280 Higashi Koigakubo, Kokubunji City, Tokyo Hitachi, Ltd., Design Research Center (72) Inventor, Keiichi Yoshioka 1-280, Higashi Koigakubo, Kokubunji City, Tokyo (56) References, Hitachi, Ltd. Design Research Center (56) JP-A-2-57910 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01C 21/00 G08G 1/0969 G09B 29/10

Claims (7)

(57) [Claims] 1. A display unit and a display control unit, wherein the display control unit displays a detailed map around the vehicle and a route map together in a display area of the display unit. While displaying at a set scale, on the detailed map, at least a part of the guide route to the destination, the current position of the vehicle and the target object are displayed, and the detailed map shows the stations, hotels and government offices. It includes information on main facilities including, in the route diagram, at least a part of the guide route is displayed from the lower side to the upper side of the display area, and a target object is displayed along the guide route, Furthermore, the display control means displays an enlarged view of the target object of the route map in the display area of the display means. 2. A detailed map around the vehicle, comprising: display means and display control means, wherein the display control means displays a detailed map around the vehicle and a route map together in a display area of the display means. While displaying at a set scale, on the detailed map, at least a part of the guide route to the destination, the current position of the vehicle and the target object are displayed, and the detailed map shows the stations, hotels and government offices. Includes information on the main facilities including, in the route diagram, at least a part of the guide route is displayed in a straight line and the target object is displayed along the guide route, and further, by the display control means, An in-vehicle navigation device, wherein an enlarged view of the target object of the route map is displayed in a display area of a display means. 3. A detailed map around the vehicle, comprising: a display means and a display control means, wherein the display control means displays a detailed map around the vehicle and a route map together in a display area of the display means. Is displayed at a set scale, and at least a part of the guide route to the destination, the current position of the vehicle and the target object are displayed on the detailed map, and the detailed map includes information on main facilities. That, in the route diagram, at least a part of the guide route is displayed from the lower side to the upper side of the display area, and a target object is displayed along the guide route, and further by the display control means, An on-vehicle navigation device, wherein an enlarged view of the target object of the route map is displayed in a display area of the display means. 4. A detailed map around the vehicle, comprising: a display unit and a display control unit, wherein the display control unit displays a detailed map around the vehicle and a route map together in a display area of the display unit. Is displayed at a set scale, and at least a part of the guide route to the destination, the current position of the vehicle and the target object are displayed on the detailed map, and the detailed map includes information on main facilities. In the route diagram, at least a part of the guide route is displayed as a straight line and a target object is displayed along the guide route, and further, by the display control unit, the display area of the display unit is displayed. An in-vehicle navigation device displaying an enlarged view of a target on a route map. 5. A detailed map around the vehicle, comprising: display means and display control means, wherein the display control means displays a detailed map around the vehicle and a route map together in a display area of the display means. Is displayed at a set scale, and at least a part of the guide route to the destination, the current position of the vehicle and the target object are displayed on the detailed map, and the detailed map includes information on main facilities. In the route diagram, at least a part of the guide route is displayed from the lower side to the upper side of the display area, and the target object and the own vehicle position are displayed along the guide route. Displays a target object located in front of the own vehicle position above the own vehicle position, while displaying the target object below the own vehicle position without displaying the target object to the lower side of the display area. Extended Display Te, and further wherein the display control unit, vehicle navigation system and displaying an enlarged view of the target of the route diagram display area of the display unit. 6. The vehicle-mounted navigation device according to claim 1, wherein when the target is designated in the route map, the display control means displays an enlarged view of the target. Characteristic vehicle-mounted navigation device. 7. The on-vehicle navigation device according to claim 1, wherein when the vehicle passes through the target object in the enlarged view, the display control means erases the enlarged view of the target object. In-vehicle navigation device.