JPH0933272A - Route search display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to display facility information required by a driver together with a sought path by seeking the path from the present position of a vehicle to the destination, and by retrieving the facility information present along the sought path based on the facility information stored in a memory means. SOLUTION: At first, the destination is set by the input of the address at the destination, the designation of the spot on a map or the retrieval of the name of the place. Then, the map of the advancing direction from the present position of the vehicle to the destination is read out of a CD-ROM 7, and the map to be displayed is developed. Thereafter, the azimuth to the destination from the present position of the vehicle is displayed with an arrow mark, and the path from the present position of the vehicle to the destination is sought. Then, the facility information required by the driver such as gasoline stations present along the path to the destination sought by the path seeking is retrieved and displayed on a liquid-crystal display 8A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling position display device for displaying a current position of an automobile or the like on a display device together with a map, and more particularly, a route search display device for searching a route to a destination and displaying the searched route on the display device. Regarding

[0002]

2. Description of the Related Art FIG. 1 shows an outline of an on-vehicle traveling position display device. In FIG. 1, 1 is a direction sensor,
The direction sensor 1 uses a geomagnetic sensor for detecting the absolute traveling direction of the automobile and an optical gyro for detecting the relative traveling direction 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 for processing sensor signals such as a direction sensor 1 and a distance sensor 2. Reference numeral 5 denotes a GPS (Global Positioning System) receiver. The GPS receiver 5 receives radio waves transmitted from a plurality of satellites and performs calculations. By doing so, the position (latitude, longitude) of the receiving point can be obtained. Reference numeral 6 denotes a CD-ROM drive. The CD-ROM drive 6 reads map data from a CD-ROM 7 on which map data is recorded. Reference numeral 8 denotes a display / operation unit provided in the vehicle interior. The display / operation unit 8 is provided on a liquid crystal display 8A for displaying a map, a current traveling position, a direction, and the like of the automobile, and is provided on a front surface of the liquid crystal display 8A. The touch panel 8B includes switches for instructing enlargement and reduction of a display 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 are provided. Reference numeral 9 denotes an apparatus body, and the configuration of the apparatus body 9 will be described next.

In FIG. 1, 10 is a C for performing various calculations.
PU (Central Processing Unit), 11 is a ROM (Read Only Memory) in which programs for various calculations performed by the CPU 10 are stored, 12 is a direction sensor 1, a distance sensor 2, a GPS
A memory (DRA) for storing data from the receiver 5, the CD-ROM drive 6, etc., the calculation result in the CPU 10, etc.
M) and 13 are backup memories (SRAM) for holding necessary data even when the power supply to the apparatus main body 9 is stopped, and 14 is a pattern such as characters and symbols displayed on the liquid crystal display 8A. A stored memory (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 output from CPU 10, current position data and Kanji, a memory (VRAM) for storing an image to be displayed on the liquid crystal display 8A by synthesizing Kanji such as a town name and a road name output from the font ROM 14, a font, and 17 for converting the output data of the VRAM 16 into a color signal This is an RGB conversion circuit, and color signals are output from the RGB conversion circuit 17 to the liquid crystal display 8A. Reference numeral 18 is a communication interface.

FIG. 2 shows a format of data stored in the CD-ROM 7, 20 is a disc label, and 2 is a format.
Reference numeral 1 is a drawing parameter, 22 is map leaf management information, and 23 is a map leaf. Background data, character data, road data, etc. are stored in this map leaf.
Data for each unit map divided by longitude is stored. The map leaf is set from a map leaf that roughly describes a wide area to a map leaf that describes a narrow area in detail. Each map leaf is composed of map display levels A, B, and C that describe the same area. Map display levels A, B, and C are from A to B,
C is described in more detail than B. Each map display level A, B, C is composed of map display level management information and a plurality of units. The unit describes a divided area obtained by dividing the area of each map display level into a plurality of areas, and each unit includes a unit header, a character layer, a background layer, a road layer, an option layer, and the like. In the character layer, the place name, road name,
Facility names and the like are recorded, data for drawing roads, facilities, etc. are recorded in the background layer, and coordinate points (nodes) that describe roads including intersections are recorded in the road layer, as shown in FIG. And data regarding lines (links), such as node numbers of nodes, latitude, longitude, link numbers of links, link distances, and the like are stored. In FIG.
Circles (○) indicate nodes, and lines between the nodes indicate links. A black circle (●) with a node number of 4 indicates an intersection node. The data recorded in the road layer is not directly involved in the map display and is used as road network information for map matching. In FIG. 2, reference numeral 24 is route search data, and the route search data 24 is recorded with the search data 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 25, assumed link transit time (link cost) data 26, and route display data 27. As shown in FIG. 4, the node connection data 25 includes the nodes a to g, x,
It is data indicating which node y is connected to. For example, for node c, it is data indicating that it is connected to nodes a, d, f, and y. Further, the link cost data 26 indicates the link cost of the link between the nodes as shown in FIG. 4, and for example, the link cost of the link between the node a and the node c is “5”, and the node a The link cost of the link between the node b 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 set according to the road type and the road width, for example, as shown in FIG. The route display data 27 is recorded with data for displaying the route selected by the route search on the display map.

[0005] In FIG. 1, the output of the azimuth sensor 1 and the output of the distance sensor 2 are transmitted 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 longitude of the current position. Also GPS
The current position is corrected based on the data from the receiver 5. The map data of the unit corresponding to the current position is read from the CD-ROM 7 by the CD-ROM drive 6 based on the current position obtained in this manner, and the map data is stored in the memory (DRAM) 12 via the communication interface 18. Is stored. A part of the map data stored in the DRAM 12 is read by the CPU 10,
It is 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 the font ROM 14, and characters such as place names are displayed on the liquid crystal display 8A together with the map. , School, etc. are displayed. In addition, the current position displayed on the liquid crystal display 8A is sequentially changed based on the traveling speed and traveling direction that are sequentially obtained as the automobile travels.

Next, a conventional route search operation will be described with reference to FIGS. As shown in FIG. 9, the destination is set in step A. The setting of this destination is
For example, by inputting the address of the destination, by designating the point on the map displayed on the display device 8, or by selecting the desired place name from the place name index displayed on the display device 8. Be seen. In step B, it is determined whether or not to start the route search. This determination is made based on whether or not the route search switch on the touch panel 8B of the display device 8 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. 4, 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 4, the total link cost of the links X → a → c → d → f → g → y (1
Since 0 + 5 + 5 + 5 + 5 + 5 = 35) is the smallest, the route connecting the links X → a → c → d → f → g → y is selected. The route selected in step C of FIG. 9 is displayed in red, for example, on the display map of the display device 8 in step D. FIG. 10 shows FIG.
10 is a more detailed view of the route search step C in FIG. 10. First, in FIG. 10, in step a, a departure node and a destination node closest to the positions of the departure point and the destination are selected. In FIG. 4, node X is selected as the departure node and node Y is selected as the destination node. Next, in 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. This route search is as described above
The route with the lowest total link cost is selected. 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, and the destination node Y is included in the data read from the CD-ROM 7 in step b.
Is included, it is determined to be yes in step d, but if the destination is far from the departure point, step d
Is determined to be no and the process proceeds to step e. In step e,
The route search data including the destination node Y is read from the CD-ROM 7 and the route search on the destination side is performed in step f. 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 result of this determination 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.

In FIG. 6, the distance between the starting point and the destination is long,
It is the figure which showed the operation | movement when it is determined by step d and step g in FIG. 10 with no intelligibility that the route selected by the route search of the departure side is not connected to the destination node, and the route of the destination side is also connected. When the route selected in the search is not connected to the route searched in the departure-side route search, the route search data 28 of the hierarchy 1 is read and the departure node 2
9. The target node 30 is set. When the route shown by the solid line is searched for by the route search in the hierarchy 1, it is judged as YES in step d of FIG. 10, the process proceeds to step j, the route from the starting point to the destination is constructed in step j, and the route is searched in step k. The display data of the selected route is created and the route search is completed.

FIG. 11 shows a display example on the liquid crystal display 8A. In FIG. 11, reference numeral 31 denotes the own vehicle mark, and this own vehicle mark 31 shows the current position and the traveling direction of the own vehicle. Reference numeral 32 indicates the route searched by the route search, 33 indicates the direction of the destination at the current position, and 34 indicates the distance from the current position of the own vehicle to the destination. Reference numeral 35 is a touch switch for displaying or erasing the distance to the destination on the liquid crystal display 8A.

[0009]

However, in the above-mentioned conventional example, only the map and the route to the destination are displayed on the display device, and the information required by the driver, for example, the gas station, the store along the route, is displayed. I didn't know if there was a car repair shop. If the scale of the map displayed on the display device is changed, the position of the gas station is displayed on the display map, but the operation for changing the scale of the display map must be performed, which is inconvenient.

The present invention solves the above-mentioned conventional problems, and not only displays the route searched by the route search on the display device, but also displays the facility information required by the driver. Is provided.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a present position calculating means for obtaining a present position of a vehicle based on a traveling distance and a traveling azimuth of the vehicle, and a memory storing map data. Means, a display means for displaying the map read from the storage means corresponding to the current position obtained by the current position calculation means together with the current position of the vehicle, a destination input means for inputting a destination, and a vehicle Along the route searched by the route search means based on the facility information stored in the storage means and the route search means for searching the route from the current position to the destination and displaying the searched route on the display means The present invention further comprises facility search means for searching existing facility information and displaying it on the display means.

[0012]

According to the present invention, the route to the destination input by the destination inputting means is searched by the route searching means, and the facility information such as a gas station existing along the searched route is stored in the facility searching means. The facility information searched for is displayed on the display means.

[0013]

EXAMPLE An example of the present invention will be described below with reference to FIGS.
It will be explained together. FIG. 7 shows a processing flow of route search in this embodiment. The destination is input in step S1 in FIG. The destination can be set by, for example, inputting the address of the destination or the display device 8
By specifying the point on the map displayed in
Alternatively, it is performed by selecting a desired place name from the place name index displayed on the display device 8. In step S2, a CD-R map of the direction of travel from the current vehicle position to the destination is displayed.
Read out from OM7 and develop display map. Step S3
Then, an arrow (arrow 33 in FIG. 8) is displayed to indicate the target local position from the current position of the vehicle. In step S4, a route from the current position of the vehicle to the destination is searched. This route search process is similar to the conventional example. In the next step S5, the route searched for is displayed on the liquid crystal display 8A. In FIG. 8, the route 37 shows the route to the destination searched by the route search. In step S6, it is determined whether or not the facility information is displayed on the liquid crystal display 8A, and it is determined whether or not the touch switch "information" 36 arranged on the liquid crystal display 8A is operated. When it is determined that the "information" 36 is operated, the facility information is searched in step S7. The “facility information” is facility information recorded in the character layer in the unit shown in FIG. 2, such as a gas station, a store (convenience store, etc.), a post office,
It is information indicating the type of facility such as an automobile repair shop, the location of the facility, etc. The search for facility information means a gas station existing along the route searched by the route search,
Searching for facilities such as shops, post offices, automobile repair shops, for example, searching for facilities along the route from the current position to the destination, or within 2 km from the current position, 2-5 km It searches for facilities along the route in the range of 5 to 10 km and sorts by facility type. In step S8, the facility information extracted by the facility information search is displayed on the liquid crystal display 8A as shown in FIG.
To be displayed. In Figure 8, there is one gas station within 2 km along the route from the current position to the destination.
There are 2 in 5km range, 3 in 5-10km range, and 1 convenience store within 5km.
There are eaves, and one is in the range of 5 to 10 km. Step S9 is a step of determining whether or not the touch switch "information" 36 is turned off.
When it is determined in 9 that the touch switch "information" 36 is turned off, the facility information displayed on the liquid crystal display is erased in step 10 and the present process is terminated.

As described above, in the above embodiment, the facility information required by the driver such as a gas station existing along the route to the destination searched by the route search can be retrieved and displayed on the liquid crystal display 8A. It is possible. Even if the position of the gas station or the like is not displayed on the liquid crystal display 8A, the driver can easily understand how much the vehicle should travel along the route to find the gas station or the like. In the above embodiment, by changing the scale of the display map in the state shown in FIG. 8, the position of the gas station or the like can be displayed on the display map.

[0015]

According to the present invention, the present invention has the advantage that the facility information existing along the route from the current position of the vehicle to the destination can be displayed on the display means. Is.

[Brief description of drawings]

FIG. 1 is a block diagram of a traveling position display device including a route search display device according to an embodiment of the present invention.

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

FIG. 3 is a configuration diagram showing road data recorded in a CD-ROM of the same embodiment.

FIG. 4 is a schematic diagram for explaining the route search method of the same embodiment.

FIG. 5 is a configuration diagram of a memory that stores a link cost calculation setting speed in the embodiment.

FIG. 6 is a schematic diagram illustrating a hierarchical structure for route search in the embodiment.

FIG. 7 is a flow chart of route search in the embodiment.

FIG. 8 is a display diagram showing a display example of the same embodiment.

FIG. 9 is a flow chart of route search of a conventional route search display device.

FIG. 10 is a flow chart of a route search of a conventional route search display device.

FIG. 11 is a display diagram showing a display example of a conventional route search display device.

[Explanation of symbols]

 Reference Signs List 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 body 10 CPU 15 image processor

Claims (5)

[Claims] 1. Corresponding to a present position calculating means for obtaining a present position of the vehicle based on a traveling distance and a traveling direction of the vehicle, a storing means for storing map data, and a present position obtained by the present position calculating means. Display means for displaying the map read from the storage means together with the current position of the vehicle, destination input means for inputting the destination, and route searched from the current position of the vehicle to the destination. And a facility for displaying facility information existing along the route searched by the route searching means on the basis of the facility information stored in the storage means and displaying the facility information on the display means. A route search display device comprising search means. 2. The facility information searched by the facility search means is displayed on the same screen of the display means on which the current position of the vehicle obtained by the current position calculation means and the map read from the storage means are displayed. The route search display device according to claim 1, wherein: 3. The facility name retrieved by the facility retrieval means and the presence or absence of this facility are displayed.
The described route search display device. 4. The route search display device according to claim 1, wherein facilities existing within a predetermined distance range from the current position of the vehicle are searched by the facility search means and displayed on the display means. 5. The route search display device according to claim 4, wherein a plurality of types of facilities existing within a predetermined distance range from the current position of the vehicle are searched by the facility search means and displayed on the display means.