JPH07334798A - Route guidance and display device - Google Patents

Abstract

PURPOSE:To enable a following vehicle to easily follow a precedent vehicle by displaying the travel track of the precedent vehicle on the following vehicle. CONSTITUTION:The route guidance display device of an on-vehicle travel position display device is equipped with a memory (DRAM) 41 which stores travel track data on its vehicle, a memory (DRAM) 42 which stores travel track data on other vehicles, and a communication device 40 which sends and receives the travel track data on its vehicle and other vehicles, and when a request to send travel track data is made from the following vehicle to the precedent vehicle, the travel track data on the precedent vehicle are sent to the following vehicle through the communication device 40, and its vehicle position, a map, and the travel track of the precedent vehicle is displayed on the display 8A of the following vehicle, thereby making it easy for the following vehicle to follow the precedent vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a route guidance device applied to a navigation system.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram of a vehicle-mounted traveling position display device (navigation system) having a conventional route guidance display device.

In FIG. 5, reference numeral 1 denotes an azimuth sensor. The azimuth sensor 1 includes a geomagnetic sensor for detecting the absolute traveling azimuth of the automobile and an optical gyroscope for detecting the relative traveling azimuth of the automobile. Reference numeral 2 is a distance sensor that generates a pulse according to the number of rotations of the wheel, and 3 is various sensor signals such as an ON / OFF signal of a brake switch and a parking switch and a power supply voltage monitoring signal. Reference numeral 4 denotes a sensor signal processing unit that processes sensor signals from the azimuth sensor 1 and the distance sensor 2, and 5 denotes a GPS (Global Positionin).
g GPS system), and this GPS receiver 5 obtains the position (latitude, longitude) of the receiving point by receiving and calculating radio waves transmitted from a plurality of satellites.

Reference numeral 6 denotes a CD-ROM drive, which is C
The D-ROM drive 6 is a CD on which map data is recorded.
-To read map data from the ROM. Reference numeral 8 denotes a display / operation unit installed in the vehicle interior. The display / operation unit 8 is provided on a liquid crystal display 8A for displaying a map and the current traveling position, direction, etc. of the automobile, and is provided in front of the liquid crystal display 8A. The touch panel 8B includes a switch for instructing enlargement or reduction of the displayed map, a switch for instructing a route search, a switch for selecting a destination from the place names displayed on the liquid crystal display 8A, and the like. is doing. Reference numeral 9 denotes an apparatus main body, and the apparatus main body 9 is installed in a trunk room or the like.

Next, the structure of the apparatus body 9 will be described.
Reference numeral 10 denotes a CPU (central processing unit) for performing various calculations, 11
Is an RO that stores various calculation programs executed by the CPU 9.
M (read only memory), 12 is a memory (DRAM) for storing data from the azimuth sensor 1, the distance sensor 2, the GPS receiver 5, the CD-ROM drive 6 and the like, a calculation result in the CPU 10 and the like, and 13 is a device main body 9 A backup memory (SRAM) for holding necessary data even when power supply to the LCD is stopped, and 14 is a memory for storing patterns such as characters and symbols to be displayed on the liquid crystal display 8A (kanji, font ROM ), 15 is an image processor for forming a display image based on map data, current position data of the vehicle, etc. 16 is map data calculated by the CPU 10, current position data and kanji, and town name output from the font ROM 14. And kanji such as road names,
A memory (VRAM) for storing an image displayed on the liquid crystal display 8A by synthesizing fonts, and 17 is a VRAM 16
Is an RGB conversion circuit for converting the output data of the above into a color signal, and this color signal is output from the RGB conversion circuit 17 to the liquid crystal display 8A.

Reference numeral 18 is a communication interface, 19 is a voice processor, and the voice processor 19 is the CPU 1
A predetermined voice message is created based on the command of 0, and the voice message created by the voice processor 19 is output as voice from the speaker 20.

FIG. 6 shows a format of data stored in the CD-ROM 7. In FIG. 6, 21
Is a disc label, 22 is a drawing parameter, 23 is drawing leaf management information, and 24 is a drawing leaf. The drawing leaf 24 stores background data, character data, road data, etc.
Data is stored for each unit map obtained by dividing a topographic map of Japan by latitude and longitude. Further, in the map leaf 24, a map leaf that roughly describes a wide region is set to a map leaf that describes a narrow region in detail.

Each map leaf is composed of map display levels A, B and C which describe the same area. Regarding each of these map display levels A, B, and C, B is described more than A, and C is described in more detail than B. Further, each map level A, B, C is composed of map display level management information and a plurality of units.

This unit describes a divided area obtained by dividing the area of each map display level into a plurality of areas, and each unit is composed of a unit header, a character layer, a background layer, a road layer, an option layer and the like.

In the character layer, place names, road names, facility names, etc. displayed on the map are recorded, in the background layer, data for drawing roads, facilities, etc. is recorded, and in the road layer, FIG. Data about coordinate points (nodes) and lines (links) that describe roads including intersections, as shown in
For example, the node number of the node, the latitude, the longitude, the link number of the link, the link distance, etc. are stored.

In FIG. 7, circles (∘) indicate nodes, and lines between the nodes indicate links. In addition, the black circle (●) of the node number: 4 indicates an intersection node.

The data recorded in the road layer is not directly involved in the map display, but is used as road network information for map matching.

In FIG. 6, reference numeral 25 denotes route search data, and the route search data 25 is recorded for each layer from layer 0 for a narrow area to layer n for a wide area. . The search data of each layer is composed of node connection data 26, assumed link transit time (link cost) data 27, and route display data 28.

As shown in FIG. 8, the node connection data 26 is data indicating which node each of the nodes a to g, x, and y is connected to. For example, for the node c, the nodes a, d, and f. , Y, which indicates that the data is connected. Further, as shown in FIG. 8, the link cost data 27 indicates the link cost of the link between the nodes, and for example, the link cost of the link between the node a and the node c is “5”, The link cost of the link between the node a and the node b is “10”, and the link cost of the link between the node a and the node d is “20”.

The link cost is obtained from link cost = link distance / set speed, and the set speed is, for example, as shown in FIG.
It is set according to the road type and road width.

The route display data 28 is for displaying the route selected by the route search on the display map.

In FIG. 5, the output of the azimuth sensor 1 and the output of the distance sensor 2 are sent to the CPU 10 via the sensor processing unit 4.
Sent to. The CPU 10 calculates the current position of the vehicle, and obtains the latitude and lightness of the current position. Also, the current position of the vehicle is corrected based on the data from the GPS receiver 5.

Based on the present position thus obtained, the map data of the unit corresponding to the present position is stored in the CD-
The map data is read from the CD-ROM 7 by the ROM drive 6, and the map data is stored in the memory (DRAM) 12 via the communication interface 18. DRAM 12
A part of the map data stored in is read by the CPU 10, converted into image data by the image processor 15, and written in the image memory 16. The image data stored in the image memory 16 is converted into a color signal by the RGB conversion circuit 17 and sent to the liquid crystal display 8A, and a map of a predetermined range centering on the current position is displayed.

If the map data read from the DRAM 12 contains character codes and symbol codes, patterns corresponding to these character codes and symbol codes are read from the Kanji and font ROM 14 and displayed on the liquid crystal display 8A. Characters such as place names and symbols such as schools are displayed along with the map.

The liquid crystal display 8A is also based on the traveling speed and traveling direction which are sequentially obtained as the automobile travels.
The current position displayed in is changed sequentially.

Next, a conventional route search operation and route guidance will be described with reference to FIGS.

When a route search switch on the touch panel 8B is operated, a route search process is executed. First, Fig. 1
As shown in 2, the destination is set in step A.
The destination is set, for example, by inputting the address of the destination or by designating a point on the map displayed on the liquid crystal display 8A.

In the next step B, it is judged whether or not to start the route search. This determination is made by the touch panel 8 of the display device 8.
It is determined whether or not the B route search switch is operated. If it is determined in step B that the route search switch has been operated, the process proceeds to step C and route search is performed. In this route search, as shown in FIG. 8, the link costs of all routes from the origin (current position node) X to the destination node Y are added, and the route with the lowest link cost is selected.

In the case of FIG. 8, the link X → a → c → d → f.
→ g → Y total link cost (10 + 5 + 5 + 5 + 5 +
5 = 35) is the smallest, so link X → a → c →
A route connecting d → f → g → Y is selected.

The route selected in step C of FIG. 12 is
In step D, for example, it is displayed in red on the display map of the liquid crystal display 8A.

FIG. 13 shows step C of the route search in FIG. 12 in more detail.

In FIG. 13, first, in step a, a starting node and a destination node that are closest to the positions of the starting point and the destination are selected. In FIG. 8, the node X is selected as the departure node and the node Y is selected as the destination node.

In the next step b, the route search data including the departure node X is read from the CD-ROM 7, and in step c, the route search on the departure side is performed. As described above, this route search selects the route with the lowest total link cost. Next, in step d, as a result of the search in step c, it is determined whether or not the target node is connected.
The distance from the origin to the destination is relatively short, step b
If the destination node Y is included in the data read from the CD-ROM 7 at step d, an affirmative decision is made in step d, but if the destination is far from the starting point, step d
The negative decision is made and the operation proceeds to step e.

At step e, the route search data including the destination node Y is read from the CD-ROM 7, and at step f
Search for a route on the destination side. In step g, it is determined whether or not the route selected by the route search on the destination side in step f is connected to the search route on the departure side.
If the determination result is NO, the search hierarchy is increased by one rank in step h in FIG. If the read data in steps b and e is the route search data of layer 0, the rank is increased to layer 1 in step h. Next, in step i, the starting node and the destination node are reset, and the process returns to step b.

FIG. 10 is a diagram showing in an easy-to-understand manner the operation in the case where the distance between the departure place and the destination is long and it is determined to be no in step d and step g in FIG.

In FIG. 10, the route selected in the route search on the departure side is not connected to the destination node, and the route selected in the route search on the destination side is not connected to the route searched in the departure side route search. In this case, the route search data 29 of the layer 1 is read, and the departure node 30 and the destination node 31 are read.
Is set. When the route indicated by the solid line is searched by the route search in the layer 1, it is determined as YES in step d of FIG. 13 and the process proceeds to step j. In step j, a route from the starting point to the destination is constructed, display data of the route searched in step k is created, and the route search is completed.

In FIG. 7, the thick line indicates the guide route selected as a result of the route search, and the node 1 of the unit 2
→ 2 → 3 → 4 → 5 → 6 → node 1 of unit 1 → 2 → 3
→ The selection of 4 indicates that it is the selected guide route.

When the guide route is selected while the vehicle is traveling according to the route displayed on the liquid crystal display 8A, the guide points (about 700m, 300m, 100m before the intersection node (node 4 of the unit 2) are selected. Guidance points) A, B, C are set. When the current position reaches the guidance point A as the vehicle travels, a predetermined voice guidance, for example, "Please note that the intersection is about 700 m, please be careful." Similarly, when each of the guiding points B and C is reached, "about 3
Please note that the intersection is 00m. "," About 10
It is an intersection at 0m. be careful. I will guide you by voice.

FIG. 11 shows a table created by the route search. FIG. 11A is a table of unit-by-unit route tracking data of a guide route from the current position to the destination. In the example of FIG. 7, units 2 and 1 are written in the unit-by-unit route tracking data table.

FIG. 11B is a table of route tracking data, in which the order of the nodes in each unit of the selected guide route is written in the route order. In the example of FIG. 7, the node 1 of the unit 2 → 2 → 3 → 4 → 5 →
6 is written, and the node 1 of the unit 1 → 2 →
3 → 4 is written.

FIG. 11C is a table of guide point data, which is about 700 m before the intersection node (node 4 of the unit 2) of the selected guide route, 300
m, 100 m, eg between nodes 2 and 3 of unit 1 and nodes 3 and 4 of unit 2 in the example shown in FIG.
The guidance point is set during the period, and the voice guidance is performed every time the current position reaches the guidance points A, B, and C in the process of traveling along the guidance route displayed on the liquid crystal display 8A.

FIG. 14 shows a display example of route guidance on the display 8A in the above conventional example.

[0038]

However, in the route guidance display device of the conventional navigation system described above,
When two or more vehicles travel toward the same destination, the route search data 25 read out from the CD-ROM 2
Is different depending on the vehicle, or if the preceding vehicle intentionally leaves the searched route even if the route search data 25 are the same, tracking of the following vehicle becomes difficult. For this reason, the driver of the following vehicle must always pay attention to the movement of the preceding vehicle.

The present invention is to solve such a conventional problem. By displaying the traveling locus of the preceding vehicle on the succeeding vehicle, the succeeding vehicle can display the traveling route of the preceding vehicle as new route guidance. It is an object to provide an excellent route guidance display device that can be easily tracked.

[0040]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention determines a current position of a vehicle based on a road data storage means in which road data is recorded and a traveling speed and a traveling direction of the vehicle. The current position calculating means for detecting, the own vehicle running locus storing means for storing the running locus of the own vehicle obtained by the current position calculating means, and the running locus of the own vehicle stored by the own vehicle running locus storing means Communication means for wirelessly transmitting the traveling locus of the other vehicle to the other vehicle, wireless traveling locus storage means for storing the traveling locus of the other vehicle received by the communication means, and the road data storage. A road map read from the means, a current position obtained by the current position calculation means, and a display device for displaying the traveling locus of the other vehicle read from the other vehicle traveling locus storage means are provided, and the traveling of the other vehicle is performed. Show trail It is obtained by way.

[0041]

Therefore, according to the present invention, when a plurality of vehicles are traveling, the succeeding vehicle receives the traveling trajectory of the preceding vehicle, and the map and the traveling trajectory of the preceding vehicle are displayed on the display device of the following vehicle. , Regardless of the content or presence of route search data,
The driver of the following vehicle can easily track.

[0042]

EXAMPLES An example of the present invention will be described below.

FIG. 1 is a block diagram of a navigation system equipped with the route guidance display device of the present invention. In FIG. 1, the same components as those in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted.

That is, this embodiment is different from the conventional example in that the touch panel 8B has a switch other than the conventional switch.
It has a switch that allows or disallows the transmission of data of the traveling locus of the own vehicle to the following vehicle, and a switch that adds a function to request the transmission of the data of the traveling locus by the succeeding vehicle selecting a specific preceding vehicle. , And a communication means 40 for transmitting and receiving data on the traveling loci of the own vehicle and other vehicles, a memory (DRAM) 41 for storing the received traveling locus data of other vehicles, CP
The travel locus data of the own vehicle output from U10 is stored,
A memory (DRAM) 42 for outputting to the communication device 40 when there is a request from another vehicle is further added.

The memory 42 sequentially records new traveling locus data according to the traveling distance of the own vehicle as shown in FIG. 3. However, when the traveling locus data exceeds the memory capacity, it is temporally changed. Delete old data and record new travel path data.

Next, the operation of this embodiment will be described with reference to FIG. In the operation on the following vehicle side in FIG. 2, step S1
In, the switch for selecting the preceding vehicle on the touch panel 8B is operated, and in the next step S2, the switch for requesting the transmission of the traveling locus data is operated. Along with this, a communication locus data transmission request signal is transmitted by the communication means 40 to a preceding vehicle such as a mobile phone having a specific ID or a preceding vehicle whose transmission / reception frequency has been previously determined between the moving bodies. Send.

On the other hand, on the side of the preceding vehicle, it is judged in step S3 whether or not the transmission request signal is received by the communication means 40. In this determination, if the transmission request signal is received, the process proceeds to step S4, the reception of the transmission request is displayed on the liquid crystal display 8A, and if the transmission request signal is not received, step S3 is repeated. In the next step S5, a switch for permitting or prohibiting transmission of the traveling locus data is displayed on the liquid crystal display 8A.

In the next step S6, when the driver of the preceding vehicle confirms the display indicating that the transmission request has been received, he or she operates the touch panel 8B to select a switch for permitting or not permitting the transmission of the traveling locus data. If the driver of the preceding vehicle does not permit the transmission, the communication unit 40 transmits a signal indicating that the transmission is not permitted to the following vehicle in step S7. When the driver of the preceding vehicle permits, in step S8, the content of the memory 42 in which the data of the traveling locus of the vehicle is stored is transmitted to the following vehicle by the communication unit 40 following the signal of the transmission permission.

In step S9, the following vehicle is the communication means 40.
It is determined whether the response of the transmission request signal of the traveling locus data of the preceding vehicle received by is a permission signal or a non-permission signal. If it is a non-permission signal, the non-permission display is displayed on the liquid crystal display 8A in step S10, and the communication ends. If it is a permission signal, the data of the traveling locus sent after the permission signal is stored in the memory 41 in step S12. In step S13, in addition to the above-described conventional example, the traveling locus data stored in the memory 41 is displayed on the display 8A together with the vehicle position and the map as shown in FIG.

[0050]

As is apparent from the above embodiment, the present invention transmits the traveling locus data of the preceding vehicle to the succeeding vehicle, and the traveling locus of the preceding vehicle is displayed on the display of the succeeding vehicle together with the own vehicle position and the map. Therefore, the following vehicle can be easily tracked, and pseudo route guidance display can be performed even if the following vehicle does not have a route search function.

[Brief description of drawings]

FIG. 1 is a block diagram of a route guidance display device according to an embodiment of the present invention.

FIG. 2 is a flow chart of transmission / reception and route display in the embodiment.

FIG. 3 is a configuration diagram of travel locus data according to the embodiment.

FIG. 4 is a display diagram of a liquid crystal display of a following vehicle in the embodiment.

FIG. 5 is a block diagram of a conventional route guidance display device.

FIG. 6 is a block diagram showing the format of a conventional CD-ROM.

FIG. 7 is a configuration diagram showing road data recorded in a conventional CD-ROM.

FIG. 8 is a configuration diagram showing link costs of a conventional route search method.

FIG. 9 is a configuration diagram showing a conventional link cost calculation table.

FIG. 10 is a configuration diagram showing a hierarchical structure for conventional route search.

FIG. 11 is a configuration diagram showing a table created by a conventional route search.

FIG. 12 is a flowchart of a route search of a conventional route guidance display device.

FIG. 13 is a flowchart of a route search of a conventional route guidance display device.

FIG. 14 is a display diagram of a conventional liquid crystal display.

[Explanation of symbols]

 1 Direction Sensor 2 Distance Sensor 5 GPS Receiver 6 CD-ROM Drive 7 CD-ROM 8 Display / Operation Unit 8A Liquid Crystal Display 8B Touch Panel 9 Device Main Body 10 CPU 15 Image Processor 25 Route Search Data 26 Node Connection Data 27 Link Cost Data 28 Route Display data 29 Route search data 30 Departure node 31 Target node 40 Communication means 41 Memory for recording traveling locus of another vehicle 42 Memory for recording traveling locus of own vehicle

Claims (1)

[Claims] 1. A road data storage means in which road data is recorded, a current position calculating means for detecting a current position of the own vehicle based on a traveling speed and a traveling direction of the own vehicle, and the present position calculating means. The own vehicle running locus storing means for storing the running locus of the own vehicle, and the running locus of the own vehicle stored by the own vehicle running locus storing means are wirelessly transmitted to another vehicle, and similarly the running locus of the other vehicle is stored. Communication means for receiving wirelessly, other vehicle traveling locus storage means for storing the traveling locus of another vehicle received by the communication means, road map read out from the road data storage means and the present position calculation means A route guidance display device including a display device that displays the present position and the traveling locus of the other vehicle read from the other vehicle traveling locus storage means.