JPH0258680B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention controls communication between an in-vehicle communication device mounted on a vehicle running on the road (hereinafter simply referred to as a "driving vehicle") and a center device via the road communication device. Regarding road-to-vehicle communication systems for.

Conventional communication systems of this kind have been tried to be applied to various fields such as car location, route guidance, travel time measurement, and public car priority. In conventional communication systems, for example, vehicle number information and point information are transmitted to the center device from the vehicle's on-board communication device and the roadside communication device, and the center device stores the latest information in its storage unit. The vehicle's driving position is known. Furthermore, by storing time information in addition to the car number and point information in the storage section, it is possible to know the time required for a certain car to travel between two points.

However, if you want to know the travel route of a vehicle or the travel time between multiple points, the center device must store all point information and time information for each vehicle, which significantly increases the storage burden on the center device. .

In view of the above-mentioned circumstances, the present invention provides a structure in which an on-vehicle communication device of a traveling vehicle is provided with a storage section for storing a plurality of point information and time information, and a center device is configured to check the stored contents of the traveling vehicle as necessary. It is an object of the present invention to provide a road-to-vehicle communication system that has a small storage burden on a center device and is capable of confirming routes at multiple points and measuring travel time.

The present invention will be specifically described below based on embodiments shown in the drawings.

FIG. 1 shows a road-to-vehicle communication system according to an embodiment of the present invention.
Roadside devices 1a, 1b for communicating with devices 1a, 2b, etc. are placed at appropriate locations on the road, and each roadside device 1a, 1b is centrally managed by a center device 3.

The traveling vehicles 2a and 2b use the in-vehicle communication device 2 as the road device 1.
a and 1b each have a roadside communication device 1, and the roadway communication device transmits a weak radio wave of frequency ₁ ,
The in-vehicle communication device 2 transmits weak radio waves of frequency ₂ ,
communicate with each other.

Each vehicle is assigned a unique vehicle number, and communication between the on-vehicle communication device 2 of the vehicle 2a, 2b and the roadside communication device 1 of the roadside device 1a, 1b is performed using this vehicle number information. It will be done.

The roadside communication device 1 includes a transmitter 5 and a receiver 6, and a communication controller 9 controls the transmission and reception operations thereof. The receiving section 6 receives the vehicle number information issued by the vehicle, and the transmitting section 5 transmits point information indicating the transmitting point and current time to the vehicle in response to the reception of the vehicle number information by the receiving section 6. time information and a request to send stored information.

The in-vehicle communication device 2 of the traveling vehicle includes a transmitting section 7, a receiving section 8, a storage section 4, etc., the transmission and reception operations of the transmitting section 7 and the receiving section 8 are controlled by a communication control section 10, and the transmission and reception of information to the storage section 4 is controlled by a communication control section 10. Reading and writing are controlled by the control unit 11. The receiving section 8 is for receiving point information, time information, and a storage information sending request sent from the transmitting section 5 of the roadside communication device 1.

The storage unit 4 stores a unique car number and has a storage area for storing a plurality of point information and time information received by the reception unit 8. In this embodiment, FIFO (First In) is used for this storage area.
The latest location information and time information are stored using the ``First Out'' storage method.

The transmitting section 7 is for transmitting the point information and time information stored in the storage section 4 when receiving the stored information transmitting request.

For example, assuming that the traveling vehicle 2a approaches the road device 1a at point A, the traveling vehicle 2a
On-vehicle communication device 2 of a, roadside communication device 1 of roadside device 1a,
Each operation of the center device 3 will be explained.

In Fig. 3 1, the start 2A is the running vehicle 2a.
This figure shows the start of operation when the in-vehicle communication device 2 of the vehicle notifies its own vehicle number.
), it is determined whether a certain period of time has elapsed, and if the determination is "YES", the in-vehicle communication device 2 issues the vehicle number information (Step 2), and if the determination is "NO", it is in a state of waiting for notification. becomes.

Starts 1A and 3A of Figure 4 1 and Figure 5 1
is the roadside communication device 1 and center device 3 of the roadside device 1a.
This indicates the start of operation when transmitting and receiving point information and time information. When the traveling vehicle 2a reaches the communication area of the roadside communication device 1, step 3 is started in FIG.
The determination of "Is there communication?" is "YES" and the process moves to step 2.The roadside communication device 1 receives the vehicle number information issued by the on-vehicle communication device 2 of the traveling vehicle 2a in step 4, and then proceeds to step 5. Then, this car number information and point information indicating its own point are transmitted to the center device 3.

In step 6 of FIG. 5, the center device 3 determines whether the vehicle number and location information has been received.
If the determination is "YES", each piece of information is stored in the storage section (step 7). The storage section of the center device 3 is shown in FIG.
As shown in the figure, it has a car number storage area _m1 and a location storage area _m2 , and by extracting this information from the storage section and displaying it, it is possible to confirm which location the vehicle of each car number is at. . Next, in step 8, the center device 3 reads the current time stored in the storage unit (the current time is rewritten as time passes), and in step 9, sends the location and time information to the roadside machine 1a. .

In the roadside communication device 1 of the roadside device 1a, in FIG. 4, the determination in step 10 as to whether the location and time information has been received is “YES”, and in step 11, this information is transmitted to the traveling vehicle 2a.

Start 2B in FIG. 32 indicates the start of operation when storing location and time information in the storage unit 4 of the on-board communication device 2, and the determination of "whether location and time information has been received" in step 12 is “YES” and
This information is stored in the storage section 4 (step 13).

Thus, as shown in FIG. 2, each time the vehicle 2a passes from point A to point B, C, D, E, and F one after another, the on-board communication device 2 of the vehicle 2a communicates with each other on the road at each point. Transmission/reception and storage operations similar to those described above are performed with the center device 3 via the roadside communication devices 1 of the machines 1a to 1f. The storage unit 4 of the in-vehicle communication device 2 is, for example, 6
Storage area that can store location and time information
Assuming that there are n ₁ and n ₂ (FIG. 6), at point F, all time information from point A to point F is sequentially stored.

Next, when the traveling vehicle 2a moves from point F to point C, the road communication device 1 of the road device 1g at point G
The above transmission/reception operation is performed with the center device 3 via
Due to the FIFO storage method, at the same time as the G point information is taken in, the oldest information, that is, A
The location and time information at the location is removed from the storage unit 4.

Next, a method of measuring travel time for the traveling vehicle 2a will be explained based on the control procedures shown in FIG. 3, FIG. 4, and FIG. 5.

First, the center device 3 starts at step 21 in FIG.
, for every road vehicle 1g at point G, there are 2 traveling vehicles.
A command signal is sent to send out the stored information of a.

In the roadside communication device 1 of the roadside device 1g, in FIG.
The determination is "YES" and the vehicle 2a is requested to send the stored information (step 23).

In the on-vehicle communication device 2 of the traveling vehicle 2a, in FIG.
The determination is "YES", and the stored information at points B to C is sent to the roadside communication device 1 of the roadside device 1g (step 25).

In the roadside communication device 1, the determination as to whether the stored information has been received is ``YES'' in step 26 of FIG. 4, and the stored information of the traveling vehicle 2a is sent to the center device 3 (step 27).

In the center device 3, the determination in step 28 as to whether the stored information has been received is ``YES'', and in step 29 this stored information is stored in the storage section of the center device 3 together with the vehicle number. Next, in the center device 3, the travel time between arbitrary points is calculated, and step 30
Then, the travel time between GF points, between GD points, and between GC points is expressed as the time difference at each point (t ₇ − t ₆ ) (t ₇ −
t ₄ ) (t ₇ − _{t 3} ).

As described above, in this invention, since the on-vehicle communication device of the traveling vehicle is provided with a storage section that stores information on a plurality of points and times, the center device can take out and check the stored information of the traveling vehicle as necessary. , it is possible to confirm the route at multiple points and measure the travel time, and since the information is stored in the in-vehicle communication device, the storage burden on the central device is reduced, which is an excellent invention that achieves the purpose of the invention. be effective.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a road-to-vehicle communication system according to an embodiment of the invention, and FIG. 2 is a schematic diagram of a road-to-vehicle communication system according to an embodiment of the present invention.
Explanatory diagram showing the arrangement of 1g, Figure 3 1, 2, 3
4 is a flowchart showing the control procedure in the on-board communication device of a traveling vehicle; FIG. 4 is a flowchart showing the control procedure in the roadside communication device of the road device;
1 and 2 are flowcharts showing the control procedure in the center device, FIG. 6 is an explanatory diagram showing the storage contents of the on-vehicle communication device, and FIG. 7 is an explanatory diagram showing the storage contents of the center device. 1...Road communication device, 1a to 1g...Road device, 2
...In-vehicle communication device, 2a, 2b...Road vehicle, 3
...Center device, 4...Storage unit.

Claims (1)

[Claims] 1. A road-to-vehicle communication system comprising a roadside communication device 1, an on-vehicle communication device 2, and a center device 3, wherein the roadside communication device 1 is installed at various locations on the road for each communication area. The in-vehicle communication device 2 is mounted on the vehicle and has a storage unit 4 for storing information consisting of a location and time, and also communicates with the center device 3 via the roadside communication device 1 in the communication area of each roadside communication device 1. The center device 3 transmits a request to send out the information stored in the storage unit 4 to the on-vehicle communication device 2 via the on-road communication device 1, and sends a request from the on-vehicle communication device 2 to the storage section 4. The in-vehicle communication device 2 receives stored information consisting of a plurality of sets of the latest points and times stored in the vehicle and executes predetermined information processing. In response, the point information and current time information of the roadside communication device 1 transmitted from the roadside communication device 1 or the center device 3 are received and stored in the storage unit 4. With,
When a request to send the stored information is received from the center device 3, a process of transmitting the stored information consisting of a plurality of sets of the latest point and time stored in the storage unit 4 to the center device 3 is executed. Features a road-to-vehicle communication system. 2. The road-to-vehicle device according to claim 1, wherein the storage unit 4 of the vehicle-mounted communication device 2 stores information consisting of a plurality of sets of the latest location and time by a first-in-first storage operation. Communications system.