JPH08166247A - On-vehicle navigation device - Google Patents

Abstract

PURPOSE: To display the search course between the present position and the destination of another vehicle other than own automobile, and transmit end receive the displayed data of this search course. CONSTITUTION: A map and the present position of an automobile are indicated on the screen of an LCD(liquid crystal display) 6A, and then the departure place and the destination being the optional two points of other vehicle traveling on the road of this map are set and the course is searched, and the course is selected. This selected search course is indicated in red or the like on the map of the screen. The display screen data of this LCD 6A are transmitted to other vehicle through a wireless transceiver 20. Or, the display screen data are received through the wireless transceiver 20, and the received display screen data are displayed on the screen with the LCD6A.

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 system for displaying a current position and a search (guidance) route to a destination on a map on a display.

[0002]

2. Description of the Related Art A conventional vehicle-mounted navigation device is a CD
-The ROM stores nodes that represent coordinate points and map information that is a set of links connecting the nodes, and this map is displayed on the main unit together with the current position of the vehicle. This main unit is installed in the trunk of a vehicle. Main unit is CPU, program ROM, working RAM, G
PS (Global Positioning System) receiver, image processor, CD-ROM drive, input interface (I
/ F) circuit and the like. A liquid crystal display (LCD) is connected to the image processor, and an operation keyboard, a direction sensor, a speed (distance) sensor, etc. are connected to the input I / F circuit. The present position of the vehicle (two-dimensional information of latitude and longitude or three-dimensional information of latitude, longitude and altitude) is calculated by the CPU based on the detection information from the GPS receiver, the azimuth sensor and the speed sensor. CD-R whose position is installed in the CD-ROM drive
It is read from the OM and displayed on this map on a liquid crystal display. Such a vehicle-mounted navigation device has a route search function of searching for and displaying a route which is considered to reach the earliest between the input destination and the current position.

FIG. 11 is a flow chart showing the processing procedure of this route search. In FIG. 11, the destination is set, for example, the address of the destination is input, or the point on the map on the screen is designated (step (hereinafter, referred to as S in the figure) 10). Next, it is determined whether or not to perform a route search (step 11). When this route search is instructed by an operation key or the like, the route search is processed. At this time, all link costs (link expected transit time) from the departure point (node at the current position) to the destination node are added to select the route with the lowest link cost (step 1).
2). For example, link X to a, b, c, d, e, f, g
The total link cost to link Y through
0 + 5 + 5 + 5 + 5 + 5). That is, since the link cost is the smallest, a, b, c,
A route connecting the links Y through d, e, f, g is selected. The selected search route is displayed in red on the map on the screen (step 13).

In this way, the conventional vehicle-mounted navigation device can display the searched route between the current position of the vehicle and the destination on the screen map.

[0005]

However, in the conventional vehicle-mounted navigation device, only the searched route between the current position of the own vehicle and the destination can be displayed on the screen map, for example, the current route of another vehicle. It is not possible to display the searched route between the position and the destination and wirelessly transmit it to the vehicle. On the contrary, when the route search is performed by the vehicle-mounted navigation device of another vehicle, the screen display data cannot be received and displayed. That is, an on-vehicle navigation device without a route search function has a drawback in that it cannot display a screen of the searched route and is inconvenient to use.

The present invention is to solve such a conventional problem, and it is possible to display a searched route between the present position of the own vehicle and the destination on a screen map, and to display the present position of another vehicle. Aiming to provide an excellent in-vehicle navigation device that can display a search route to and from a destination and can send and receive display data of this search route, and can display the search route screen on a device without the search route function. And

[0007]

In order to achieve the above object, a vehicle-mounted navigation device according to a first aspect of the present invention has a storage means for storing map information which is a set of nodes representing coordinate points and links connecting the nodes. Display means for displaying the map information read out from the storage means on the screen, setting means for setting any one or two points on the map from the reading means, and between any two points set by the setting means. And a route search means for displaying the searched route in a superimposed manner on the display screen of the display means.

According to another aspect of the present invention, there is provided a self-position detecting means for detecting the present position of the self, and the present position detected by the self-position detecting means is displayed on a map displayed by the display means. .

According to a third aspect of the present invention, a vehicle-mounted navigation device uses a GPS receiver, an azimuth sensor and a vehicle speed sensor as the self-position detecting means, and the self-position detecting means uses its own current position based on the detected information. Is a configuration for calculating.

In the vehicle-mounted navigation device according to the present invention, the destination of one point is set on the map of the display means by the setting means, and the current position of the self detected by the self-position detecting means is the display means. When displayed on the map, the route search means searches for a route having the shortest time from the current position to the destination, and displays the searched route in a superimposed manner on the display screen of the display means.

According to another aspect of the present invention, there is provided a vehicle-mounted navigation device, which is provided with a transmitting / receiving means, searches for a route having the shortest time between two arbitrary points set by the setting means, and displays the searched route by superimposing it on a map. Display screen data
The display screen data is transmitted through the transmission / reception means, and the display screen data transmitted from another device is received, and the screen is displayed on the display means.

[0012]

With such a configuration, the vehicle-mounted navigation device according to any one of claims 1 to 4 searches for a route having the shortest time between two arbitrary points set by the setting means, and displays the searched route on the display screen of the display means. It is displayed on top of each other. Also,
The current position detected by the self-position detecting means using the GPS receiver, the azimuth sensor and the vehicle speed sensor is displayed, and the search route between the set destination and the self-current position is superimposed on the display screen of the display means. It is also displayed. Therefore, the search route between the current position of the own vehicle and the destination can be displayed on the screen map, and the search route between the current position of the other vehicle and the destination can be displayed.

According to another aspect of the present invention, there is provided an on-vehicle navigation device which searches for a route having the shortest time between two arbitrary points set by the setting means, superimposes the searched route on a map, and displays display screen data on the display means. The display screen data transmitted from the transmission / reception means and received from another device concerned are received and displayed on the screen. Therefore, the display data of the search route can be transmitted and received, and the search route can be displayed by the device without the search route function.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an in-vehicle navigation device of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of an in-vehicle navigation device of the present invention. In FIG. 1, in this example, an azimuth sensor 1 using a gyro sensor or the like for detecting the absolute traveling azimuth of the own vehicle and detecting a geomagnetic sensor and a relative traveling azimuth, and a distance for generating a pulse corresponding to the rotation speed of the vehicle. Sensor 2 and 3 or more GPs in the sky
G that receives GPS radio waves from S satellites and outputs two-dimensional or three-dimensional (latitude, longitude, altitude) information of the reception position
A PS receiver 3 is provided.

Further, a CD-ROM for transmitting map information
A drive 4, a CD-ROM 5 for recording map information, which will be described later with reference to FIGS. 2 to 7, and the map information being read by the CD-ROM drive 4, a keyboard, a receiving unit for receiving a command of remote operation, and the like. A display / operation unit 6 provided is provided. Further, a liquid crystal display (LCD) 6A provided in the display / operation unit 6, an operation unit 6B for performing an operation for instructing selection such as enlargement / reduction of a display map, route search, and destination setting, and a main body device 7 are provided. It is provided.

The main unit 7 retains data by a CPU 8 for performing various controls and calculations, a program ROM 9 storing programs for the CPU 8 to perform controls and calculations, a working D-RAM 10a, and a power backup. S-RAM 10b is provided.
Further, a font ROM 11 that stores patterns of characters and symbols for display, a sensor signal processing unit 12 that processes detection signals from the azimuth sensor 1, the distance sensor 2, and the display / operation unit 6 and sends them to the CPU 8, and a GPS Receiver 3, CD-
A communication interface (I / F) circuit 13 that transmits and receives information to and from the ROM drive 4 and the operation unit 6B is provided. Also, map information, current position, font ROM 11
The image processor 14 that performs a control process of sending a display image signal obtained by combining the data from the LCD 6A to the LCD 6A, the V-RAM 15a that temporarily stores the image information, and the display color (R.
An RGB conversion circuit 15b that performs G / B conversion processing and a voice processor 16 that outputs a synthesized voice signal when outputting various processing states and display contents by voice are provided. Further, a speaker 17 for outputting audio is provided. Further, the vehicle-mounted navigation device is connected to a communication I / F circuit 13, and as will be described in detail later, a wireless transmission / reception unit for wirelessly transmitting / receiving search route data of the current position of another vehicle and a destination. 20 are provided.

Regarding the embodiment configured as described above,
The operation will be described below. The respective output signals of the azimuth sensor 1, the distance sensor 2, and the GPS receiver 3 are sent to the CPU 8 of the main body device 7 through the sensor signal processing unit 12. The CPU 8 operates according to the control program read from the program ROM 9, calculates the current position of the vehicle equipped with the device, and obtains its latitude and longitude.
Based on this current position, map information in a predetermined range centering on the current position is controlled by the CPU 8 through the communication I / F circuit 13 and the CD-ROM drive 4 to the CD-ROM 5
Is read from. This map information is for working D-
It is stored in the RAM 10a. A part of the map information stored in the D-RAM 10a is read out, converted into image information by the image processor 14 and written in the V-RAM 15a. The image information written in the V-RAM 15a is read out under the control of the image processor 14 and sent to the LCD 6A of the display / operation unit 6. Here, a map of a predetermined range centering on the current position of the vehicle is displayed. When the map information from the D-RAM 10a includes a character code and a symbol code, the character code and the symbol code are read from the font ROM 11 and the LCD 6A is displayed.
It is displayed as a kanji character, a symbol such as a school together with a map. In addition, the CPU 8 is sequentially operated as the vehicle travels.
The current position of the own vehicle obtained by calculation is displayed by moving on the map of the LCD 6A.

FIG. 2 is a diagram showing the format of the data stored in the CD-ROM 5. In FIG. 2, this format has a disk label 21, drawing parameters 22, map leaf management information 23, map leaves (map data) 24, and route search data 25. Figure leaf (map data)
24 stores background data, character data, road data, and the like, and stores, for example, data for each unit map obtained by dividing a topographic map of Japan by latitude and longitude. The map leaf includes a map leaf that roughly shows a wide area and a map leaf that shows a narrow area in detail. The map leaf has map display levels A, B, and C showing the same area. are doing. The map display levels A, B, C are shown in detail in the order of C, B, A. Also, map display levels A, B, and C are map display management information and regions of each map display level are divided,
It consists of multiple units that indicate the divided areas. Each unit has a unit header, a character layer, a background layer, a road layer, an option layer, and the like. Place names, road names, facility names, etc. displayed on the map are recorded in the character layer, and data for describing roads, facilities, etc. are recorded in the background layer.

FIG. 3 is a diagram showing road layer data. As shown in FIG. 3, data on coordinate points (nodes) and lines (links) indicating roads including intersections, such as node numbers, latitude, longitude, link numbers, link distances and road width data, national roads, and prefectural roads. , Road type data such as expressways are recorded. "Circles" in FIG. 3 indicate nodes, and lines between the nodes indicate links. Further, the node number 4 "black circle" indicates an intersection node. The data recorded in the road layer is used as road network information for map matching without directly participating in the map display. As the route search data 25 in FIG. 3, search data is recorded for each layer from a layer 0 for a narrow area to a layer n for a wide area. The search data of each layer is composed of node connection data 26, link cost (link expected transit time) data 27, and route display data 28. The node connection data 26 is data indicating which node is connected. In FIG. 3, a thick line indicates the guide route selected as a result of the route search, and the nodes 1, 2, 3, of the unit 2 are shown.
It shows that the routes of 4, 5, 6 and the units 1, 2, 3, 4 are the selected guide routes. If a search route is selected while traveling on a road on the map, approximately 700 m, 3 in front of the intersection node (node 4 of unit 2)
00m, 100m guidance point (guidance point) A,
When B and C are set and this guidance point A is reached,
The synthetic voice "The intersection is about 700 m. Please be careful." Is output. Similarly, when reaching the guidance point B, the synthetic voice "At the intersection of about 300 m. Please be careful." When reaching the guidance point C, the synthetic voice "At the intersection of about 100 m. Please be careful." Output.

FIG. 4 is a diagram showing node connection data.
In FIG. 4, the node connection data 26 includes the nodes a to
Data indicating which node g, x, y is connected to. For example, for node c, nodes a, d,
It is shown that they are connected to f and y. Further, the link cost data 27 shows the link cost of the link of each node as shown in FIG. 4, for example, the link cost of the link between the node a and the node c is “5”, and The link cost of the link with the node b is “0”, and the link cost of the link with the node a and the node d is “20”. The link cost can be represented by "link distance / set speed".

FIG. 5 is a diagram for explaining the set speed. In FIG. 5, the set speed is set according to the road type and the road width. Route display data 28
Stores data for displaying the route selected by the route search on the screen map.

FIG. 6 is a diagram for explaining the route search when the departure place and the destination are far from each other. In FIG. 6, when the route selected by the route search on the departure side is not connected to the destination node and the route selected by the route search on the destination side is not connected by the route searched by the departure side, When the route shown by the solid line is searched by the route search in 1, the route from the departure point to the destination is configured, the display data of the searched route is created, and the route search is finished.

FIG. 7 is a diagram showing a table created by the route search. In FIG. 7, (A) is a table of unit-by-unit route tracking data of a search route for guiding from the current position to the destination. In the example of FIG. 3, unit 2 and unit 1 are written in the unit-by-unit route tracking data. . The order of the nodes in each unit of the selected search route is written in the route order. In the example of FIG. 3, the nodes 1, 2, 3, 4, 5, 6 of the unit 2 are written in the order, and the nodes 1, 2, 3, 4 of the unit 1 are subsequently written. FIG. 7C is a table of guide point data, which is about 700 m, 300 m, 100 in front of the intersection node (node 4 of unit 2) of the selected search route.
, For example, in the case of FIG. 3, guiding points are set between the node 2 and the node 3 of the unit 1 and between the node 3 and the node 4 of the unit 2, and as described above, Guidance is provided by synthetic voice.

Hereinafter, the search route between the current position of the own vehicle and the destination is displayed, and the search route between the current position of the other vehicle and the destination is displayed, and the search route is displayed. The operation of transmitting and receiving data will be described.

FIG. 8 is a flow chart showing the processing procedure of this operation, and FIG. 9 is a flow chart showing the subroutine processing in FIG. 8 in detail. Further, FIG. 10 is a diagram showing a display screen in this operation.

In FIG. 8, the map and the current position of the own vehicle are displayed on the screen of the LCD 6A shown in FIG. 1 by the above operation, and thereafter, the departure point (point A of the other vehicle traveling on the road of this map. ) And the destination (point B) are set, for example, the address of the destination is input, or the point on the map on the screen is designated (step 20). Next, it is determined whether or not to perform a route search (step 21). When this route search is instructed, the route search is processed. In this case, all link costs from the starting point (node at the current position) to the destination node are added, and the route with the smallest link cost is selected (step 22). For example, the link cost of the link Y shown in FIG. 4 from the link X through a, b, c, d, e, f, g is 35 (10 + 5 + 5 + 5) in total.
+ 5 + 5), which is the smallest, and the path connecting the link Y from the link X through the links a, b, c, d, e, f, and g is selected. The selected searched route is displayed in red or the like on the map on the screen (step 23). Next, the display screen data of the LCD 6A is transmitted to the in-vehicle navigation device of another vehicle through the wireless transceiver 20 shown in FIG. 1, and the transmission is completed (step 2).
4, 25). In this case, as shown in FIG. 10, a vehicle 32, which is a transmission destination, is traveling near a vehicle 31 on a road of a map 30 toward a destination 33 and a route 34 of the configuration shown in FIG. It is equipped with an in-vehicle navigation device. The display screen data (radio waves) is received through the wireless transceiver 20 of the vehicle-mounted navigation device, and the display screen data is taken in by the CPU 8 through the wireless transceiver 20 and the communication I / F circuit 13, and the image processor 14 and the V-RO.
The screen is displayed on the LCD 6A through the M15a and the RGB conversion circuit 15b. A north direction mark 35 is displayed on the screen of the LCD 6A.

In FIG. 9, a node and a destination node that are closest to the positions of the starting point and the destination are selected. FIG. 5 shows that the node X is selected as the departure node and the node Y is selected as the destination node (step 30). next,
The route search data including the departure node X is read from the CD-ROM 5, and then the route search on the departure side is performed (steps 31 and 32). In this route search, as described above, the route with the smallest total link cost is selected. Next, as a result of the route search, it is determined whether or not the target node is connected. The distance from the origin to the destination is relatively short, and CD-
When the destination node is included in the data read from the ROM 5, the route search data including the destination node Y is C
The route is read from the D-ROM 5 and the route search for the lowland is performed (steps 33, 34, 35). Next, it is determined whether or not the route selected by the route search on the destination side is connected to the search route on the departure side (step 36). If connection cannot be made in step 36, the search hierarchy is moved up by one rank (step 37). When the data read from the CD-ROM 5 is the route search data of layer 0, the layer is moved up by one rank and reset at the starting node and the destination node to read the route search data from the CD-ROM 5 (step 38). ). If the destination node is connected in step 33 and if the route is connected to the search on the departure side in step 36, the route from the departure place to the destination is configured, route display data is created, and the process ends. (Steps 39 and 40).

As described above, in this embodiment, the map and the searched route between the current position of the own vehicle and the destination can be displayed on the screen of the LCD 6A, and the route between the current position of another vehicle and the destination can be displayed. You can display the search route. Then, the display data of the searched route is transmitted and received through the wireless transceiver 20. That is, the screen display of the search route is performed on the device without the search route function.

[0030]

As is apparent from the above description, according to the vehicle-mounted navigation device according to the first to fourth aspects, the shortest time route between any two set points is searched and the searched route is displayed. Display the detected current position on the display screen of, and display the searched route between the set destination and the current position of the user on the display screen of the display means. Therefore, the search route between the current position of the own vehicle and the destination can be displayed on the screen map, and the search route between the current position of the other vehicle and the destination can be displayed.

According to the on-vehicle navigation device of the fifth aspect, a route having the shortest time between two arbitrary set points is searched, and the display route data displayed on the display means is transmitted and received by superimposing the searched route on the map. Send through means,
Moreover, since the display screen data transmitted from another device concerned is received and displayed on the screen, the display data of the searched route can be transmitted and received, and the searched route can be displayed by the device having no searched route function. Have.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram showing a data format of a CD-ROM of the same embodiment.

FIG. 3 is a configuration diagram showing a data configuration of a road layer of the embodiment.

FIG. 4 is a configuration diagram showing a node connection data configuration of the same embodiment.

FIG. 5 is a configuration diagram showing a set speed data configuration corresponding to road types and widths in the embodiment.

FIG. 6 is a schematic diagram showing a route search when the starting point and the destination are distant in the same example.

FIG. 7 is a configuration diagram showing a data table created by the route search of the embodiment.

FIG. 8 is a flowchart showing an operation processing procedure of the embodiment.

FIG. 9 is a flowchart showing a detailed processing procedure of the operation of the embodiment.

FIG. 10 is a display diagram showing a display screen of the liquid crystal display of the embodiment.

FIG. 11 is a flowchart showing a processing procedure of a conventional vehicle-mounted navigation device.

[Explanation of symbols]

 3 GPS receiver 4 CD-ROM drive 5 CD-ROM 6 display / operation unit 6A LCD 7 main unit 8 CPU 10a D-RAM 10b S-RAM 13 communication I / F circuit 14 image processor 20 wireless transmission / reception unit

Claims (5)

[Claims] 1. A storage unit that stores map information that is a set of nodes that represent coordinate points and links that connect the nodes, a display unit that displays the map information read from the storage unit on a screen, and a read unit. Setting means for setting any one or two points on the map of, and a route of the shortest time between any two points set by the setting means is searched, and the searched route is displayed on the display screen of the display means. A vehicle-mounted navigation device, comprising: a route search means for displaying the same in a superimposed manner. 2. The self-position detecting means for detecting the current position of the self is provided, and the current position detected by the self-position detecting means is displayed on the map displayed by the display means. In-vehicle navigation device. 3. A GPS receiver, an azimuth sensor, and a vehicle speed sensor are used as the self-position detecting means, and the self-position detecting means calculates the present position of the self based on the detected information. The vehicle-mounted navigation device according to claim 2. 4. When the destination of one point is set on the map of the display means by the setting means, and the current position of the self detected by the self-position detecting means is displayed on the map of the display means. 2. The route search means searches for a route having the shortest time from the current position to the destination, and displays the searched route by superimposing it on the display screen of the display means. Alternatively, the vehicle-mounted navigation device according to the above item 3. 5. A transmission / reception means is provided, a route having the shortest time between two arbitrary points set by the setting means is searched, and the display screen data displayed by the display means by superimposing the searched route on the map is transmitted / received. The display screen data transmitted from the device and received from the other device and displayed on the screen by the display device.
The in-vehicle navigation device described in 2, 3, or 4.