JPH0567295A - Selecting and displaying method of road information obtained from beacon - Google Patents

Abstract

(57) [Summary] [Structure] When the road information received from the beacon installed on the road is displayed on the screen of the navigation device or the like, if the road information is received from the beacon, the vehicle travels to the destination. Only the road information b related to the route is selected and displayed on the screen. [Effect] The driver can grasp only the information that the driver really needs out of the enormous amount of road information, and can be used for smooth and safe traffic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road information selection and display method for selecting road information received from beacons installed on the road and displaying it on a screen of a display device such as a navigation device.

[0002]

2. Description of the Related Art Conventionally, in order to assist a vehicle in reaching a destination, a navigation device for displaying current position information to a driver of a vehicle or a passenger (hereinafter simply referred to as "driver") is mounted on a vehicle. It may be done. This navigation device includes a small computer and a display device, detects the traveling distance and the traveling direction by a vehicle speed sensor and a direction sensor, updates the current position of the vehicle, and displays the current position on the display device together with a road map. It can be done.

By the way, the navigation device not only notifies the driver of the current position of the vehicle, but also obtains information about the installation position of the beacon, traffic regulation, traffic congestion, etc. from the beacon on the road to obtain the current position of the vehicle. It can also play a role of correcting road conditions and communicating road conditions to the driver. Beacons here are installed on the road and compare signals that include information about their own position coordinates, intersection information, road regulation information, traffic jam / accident information, peripheral guidance information, etc. (hereinafter referred to as "road information"). It is a device that radiates toward a narrow area, and by receiving this radiated signal in the vehicle, the vehicle can correct the estimated position of the vehicle and provide useful road information to the driver. Like

In detail, the information on the own position coordinates includes the position coordinates where the beacon is installed and the route name. When the vehicle passes the beacon, the own vehicle position is corrected. Therefore, it is the information that must be given with the highest priority. The intersection information is related to the location and name of the nearest intersection where the beacon is installed, the relative distance and direction from the beacon, the number of branch roads, the direction of each branch road, and the destination or road name by direction. Information etc.

The road regulation information is information on prohibition of entry on a specific road, right turn allowed, left turn allowed, and the like. The traffic jam / accident information is information on the length of traffic jam on a specific road and the occurrence of an accident. The peripheral guidance information is information about buildings, bridges, and the like that serve as landmarks around the road.

[0006]

By the way, the amount of information obtained from a beacon is a huge amount of about 10 kbytes on a general road and about 6 kbytes on a highway. this house,
Most of the information will be road regulation information and traffic jam / accident information that are particularly necessary for drivers. Therefore,
Even if all such information sent from the beacon is displayed on the screen, the driver will be confused about which information is needed and which information is not needed, and it will be confusing.

Therefore, an object of the present invention is to provide a method of selecting and displaying road information, which can give only necessary information to a driver among road information in a certain form in consideration of driving safety.

[0008]

A method of selecting and displaying road information according to the present invention for achieving the above object relates to a route on which a vehicle travels to a destination if the vehicle receives the road information from a beacon. This is a method of selecting only road information and displaying it on the screen (Claim 1). According to this method, it is possible to display only the road information on the route traveled by the vehicle to the destination on the screen.
With just a glance at the screen, you can visually check only the necessary information.

Further, according to the present invention, when the vehicle receives the road information from the beacon, only the road information relating to the straight line or the vicinity of the straight line when connecting the present location to the destination is selected and displayed on the screen. This is a display method (claim 2). According to this method, if the road information is received from the beacon on the road, only the information on the traveling direction to the destination can be displayed on the screen, so that the driver can obtain only the necessary information on the certain direction of the destination. it can.

If one or a plurality of transit points are set from the present location to the destination and the vehicle receives the road information from the beacon, the present location, the transit location and the destination are connected in a straight line. Alternatively, a method of selecting only road information related to the vicinity of a straight line and displaying it on the screen can be adopted (claim 3). According to this method, when there is a large detour from the current location to the destination, by setting a waypoint, it is possible to display only information along the travel route on the screen.

When the optimum route from the current position to the destination is calculated and the road information is received from the beacon in the vehicle, only the road information on or near the optimum route is selected and displayed on the screen. (Claim 4) According to this method, in the navigation device having the function of calculating the optimum route from the current position to the destination, only the information on the route can be displayed. Therefore, the driver needs only to glance at the screen and need the information on the traveling route. You can select only important information.

Further, when the vehicle receives the road information from the beacon, only the road information relating to the road selected by the driver may be selected and displayed on the screen (claim 5). According to this method, the driver can select and display only the information on the specific road that is of particular interest.

[0013]

Embodiments will be described in detail below with reference to the accompanying drawings showing embodiments. FIG. 2 shows a block diagram of the vehicle-mounted navigation device. The navigation device 2 includes wheel speed sensors 1a, 1 that detect the rotational speeds of the left and right wheels.
b, a gyro 2a that detects the turning angular velocity (from an optical fiber gyro that reads the turning angular velocity as a phase change of the interference light, a vibration gyro that detects the turning angular velocity using the cantilever vibration technology of the piezo electric element, a mechanical gyro, etc. Selected)), a geomagnetic sensor 3a that detects the absolute direction of the vehicle based on geomagnetism, a beacon receiver 4, and a navigation information providing device 1 connected to the output side of the beacon receiver 4, a geomagnetic sensor 3a, etc. Azimuth estimating unit 5 for estimating the current azimuth of the vehicle based on the accumulation of the data of the initial azimuth and the azimuth change amount detected by the gyro 2a, and based on the rotation speed pulse of the wheel detected by the wheel speed sensors 1a and 1b. Initial position (vehicle position set by keyboard 10 or input from beacon receiver 4). Position detection unit 6, which calculates travel distance data from the vehicle position), acquires the azimuth data output from the azimuth estimation unit 5, and calculates a travel locus starting from the initial position by dead reckoning navigation; 8 and a road map stored in the map memory 11, a display 9 (CRT, liquid crystal display, etc.) for displaying vehicle position, azimuth, traveling locus, and road information obtained from the beacon receiver 4.

The map memory 11 is a cassette tape or a CD.
-A storage medium such as a ROM, DAT, semiconductor memory, or IC memory is used, and a road network within a predetermined range as conventionally known,
It stores road map data such as intersections and railway transportation networks. 1 / 12,500, 1 / 25,000, 1/10 for the convenience of the driver
Scales such as 0,000 and 1 / 400,000 are available. Road map data divides road maps (including highway national roads, motorways, general national roads, major local roads, general prefectural roads, general city roads of designated cities, and other living roads) into a mesh, A route consisting of a combination of a node and a link is stored for each mesh (Japanese Patent Laid-Open No. 2-277200).
reference).

Here, a node generally means a coordinate position for identifying a branch point or a bending point of a road. A node representing the branch point is a branch point node and a road bending point (branch point). The node representing (except for) is sometimes called an interpolation point node. The node data includes a node number, a node address of an adjacent mesh corresponding to the node, an address of a link connected to the node, and the like.

A link is formed by connecting each branch point node. The link data is composed of data such as a link number, addresses of start and end nodes of the link, distance of the link, direction of passing the link, required time data in the direction, road type, road width, toll road and the like. The navigation controller 8 includes a buffer memory 81,
Consists of graphic processor, image processing memory, etc.
Search of map displayed on display 9, initial position, destination, waypoint, input of road name, map scale switching,
By scrolling and editing the display data that displays the road information etc. obtained from the beacon receiver 4, and by selecting the driver, the Dijkstra method (Development Research Report of Emergency Vehicle Driving Guidance System) Management Technology Association March 1986, Dirck Von Vl
iet, "Improved Shortest Path Algorithm for Transport
ation Network ", Transportation Research, Vol.12, 19
78) has the function of calculating the optimum route from the current location to the destination. This Dijkstra method assumes that the node or link closest to the destination is the start point, the node or link closest to the departure point is the end point, and the tree of links from the start point to the end point is assumed, and the links of all the paths that make up the tree are assumed. This is a method in which costs are sequentially added and only the route with the lowest link cost that reaches the departure point is selected. Items to be considered when estimating the link cost include mileage, travel time, availability of highways, number of right and left turns, highway driving probability, avoidance of accident-prone areas, and other settings according to driver preference. There are matters I have done.

The navigation information providing apparatus 1 stores the data signal output from the beacon receiver 4 in the reception data buffer, rearranges the order of the stored data, and stores the data again in the transmission data buffer. Are sent to the navigation device 2 in the order stored in. The beacon is arranged along the road (not shown) and wirelessly transmits the current position information and the road information to the beacon receiver 4 of the vehicle.

Such information is not randomly transmitted, but is periodically transmitted from the beacon in a fixed order and according to a fixed promise code. And
Each piece of information is provided with a code indicating the type of the information, and a position coordinate related to the information (for example, in the case of congestion information, coordinates indicating from which point to which point there is congestion). Next, the operation of the navigation device 2 having the configuration of FIG. 2 will be described with reference to the flowchart (FIG. 3).

First, the driver starts the device before traveling, selects a road map in a predetermined range including the current position from the map memory 11 and displays it on the display 9. Next, the keyboard 10 is operated to set an initial position of the vehicle, a destination, a road name, or a waypoint if necessary when the route from the current location to the destination is largely bypassed (step
(1)). This setting is performed by moving the cursor indicating the position of the vehicle on the map. At this time, the initial direction of the vehicle is set by, for example, capturing the output of the geomagnetic sensor 3a. In this way, the data representing the initial position / initial bearing of the vehicle and the destination are fetched by the bearing estimating unit 5 and the position detecting unit 6.

If the destination is not set, the process proceeds to step (5) to determine whether the road name is set (12). If the road name is set, step
Proceed to (4) and save the code of the mesh that includes links along the road and its surrounding links or nodes. If no road name is set, only map data around the current location is saved. The reason for this is that the destination is not specified, and at least the road information near the current position of the vehicle is displayed.

After setting the destination and the like, it is determined whether or not to calculate the route (step (2)). When calculating the route, the navigation controller 8 calculates the route by the Dijkstra method, calculates the optimum route from the departure point to the destination, and obtains data such as links and nodes that specify the area along the optimum route. The included mesh code is stored in the buffer memory 81 (step (4)).

If the optimum route is not calculated, the process proceeds from step (2) to step (6), and the navigation controller 8 specifies the line segment from the current position of the vehicle to the destination. Then, in step (7), it is decided whether or not to supplement at the waypoint from the current position to the destination. When supplementing with waypoints, in step (8), interpolation processing is performed to connect the current location, waypoints, and destinations in order. Further, a mesh code including data such as a link and a node for specifying the area near the line segment is stored in the buffer memory 81 (step (9)).

Then, the vehicle is started, the traveling distance data from the initial position is calculated on the basis of the wheel rotation speed signals of the wheel speed sensors 1a and 1b in the position detecting unit 6, and the azimuth estimating unit 5 detects the gyro 2a The current azimuth is integrated based on the angular velocity data. Then, the position detecting unit 6 calculates the traveling locus data based on the both data and supplies it to the navigation controller 8. The navigation controller 8 causes the screen of the display 9 to display the vehicle position / direction, the traveling locus along with the road map and the optimum route.

Further, when the current position information is input from the beacon receiver 4 via the navigation information providing device 1 during traveling, the vehicle position data is input again as the initial position of the vehicle. Therefore, the locus displayed on the display 9 is corrected to an accurate locus every time the beacon data is received.

If road information is input from the beacon receiver 4 via the navigation information providing device 1,
It is determined whether or not the road information is road information concerning the specific mesh area stored in the buffer memory 81 in the procedure from step (4) to step (9) (step (10)), and if YES If so, the information is displayed on the screen (step (11)).

FIG. 1 shows a display example of road information. In FIG. 1, a triangular mark c is the current position mark of the vehicle, L is a straight line to the destination, arrow X is the direction in which the destination is, a is the accident site,
b and d indicate congestion points (the straight line L and the arrow X are not actually displayed). The congestion point b is displayed on the screen because it is near the straight line from the starting point of the vehicle to the destination. However, congestion points d that are not near the straight line to the destination
Is not displayed.

FIG. 4 shows a display example when the route to the destination D is largely detoured and the waypoints A and B are set (when YES is selected in step (7)). In this case, the line segment from the origin O to the waypoint A, the line segment from the waypoint A to the waypoint B, the waypoint B to the destination D
Road information on the line segments up to and in the vicinity of them will be displayed.

Although the navigation device has the optimum route calculation function in the above embodiments, the present invention can be implemented in a navigation device which does not have the optimum route calculation function. In this case, steps (2)-(4) may be omitted in the flowchart of FIG. Further, even in a display device that does not have a navigation function of guiding a vehicle to a destination, it is possible to apply the present invention and select and display road information acquired from a beacon.

[0029]

As described above, according to the method of selecting and displaying road information according to claim 1, when the vehicle receives the road information from the beacon, only the road information related to the route the vehicle travels to the destination is selected. Since it is displayed on the screen, the driver can confirm only the information that the driver really needs out of the enormous amount of road information, which can be useful for smooth and safe traffic.

According to the road information selection / display method of claim 2, only the road information relating to or near the straight line when connecting the present location to the destination with a straight line is selected and displayed on the screen. , In particular, without having to calculate the route
It is possible to easily select only the road information related to the route that the vehicle travels to the destination. Further, according to the method for selecting and displaying road information according to claim 3, one or more transit points are set from the current location to the destination, so that even when the current location is largely detoured, the vehicle travels. Only the information on the route can be approximately selected and displayed on the screen.

Further, according to the method of selecting and displaying road information according to claim 4, since the optimum route from the current position to the destination is calculated, the traveling route can be accurately specified, and the driver can glance at the screen. Only necessary information can be selected. According to the road information selection / display method of claim 5, only the road information related to the road selected by the driver is selected and displayed on the screen. Therefore, the driver only displays information on a particular road of particular interest. Can be obtained by selecting.

In any of the above-mentioned inventions, the driver can glance at only the necessary road information and can grasp it, can drive with a sufficient margin, and can secure traffic safety and smoothness.

[Brief description of drawings]

FIG. 1 is a diagram showing an example in which road information near a straight line to a destination is selectively displayed.

FIG. 2 is a block diagram of a navigation device.

FIG. 3 is a flowchart illustrating a method of processing road information obtained from a beacon.

FIG. 4 is a diagram showing an example in which road information near a straight line passing through waypoints is selectively displayed.

[Explanation of symbols]

 1 Navigation Information Providing Device 2 Navigation Device 4 Beacon Receiver 9 Display

Claims (5)

[Claims] 1. A method of displaying road information received from a beacon installed on a road on a screen, wherein the road information is received from the beacon in a vehicle,
A method for selecting and displaying road information acquired from a beacon, wherein only road information related to a route traveled by a vehicle to a destination is selected and displayed on a screen. 2. A method of displaying road information received from a beacon installed on a road on a screen, wherein the road information is received from the beacon in a vehicle,
A method for selecting and displaying road information acquired from a beacon, which is characterized by selecting and displaying on the screen only road information related to or near a straight line when a straight line is drawn from the current position to the destination. 3. A method for displaying road information received from a beacon installed on the road on a screen, wherein one or more transit points are set from the present location to the destination,
If the vehicle receives road information from the beacon,
A method for selecting and displaying road information acquired from a beacon, characterized by selecting and displaying on the screen only road information relating to the straight line or the vicinity of the straight line when the current position, the waypoint, and the destination are sequentially connected. 4. A method of displaying road information received from a beacon installed on a road on a screen, wherein an optimum route from a current position to a destination is calculated, and a vehicle receives the road information from the beacon. A method for selecting and displaying road information acquired from a beacon, characterized in that only road information on or near the optimum route is selected and displayed on a screen. 5. A method for displaying road information received from a beacon installed on a road on a screen, wherein the road information is received from the beacon in a vehicle,
A method for selecting and displaying road information acquired from a beacon, wherein only road information related to a specific road selected by a driver is selected and displayed on a screen.