JPH0258679B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a road-to-vehicle communication system that performs communication between an on-vehicle communication device and a center device via a roadside device.

(b) Conventional technology Traditionally, road-to-vehicle communication is based on car location,
Applications are being attempted in various fields such as route guidance, travel time measurement, and giving priority to public vehicles. In this type of conventional road-to-vehicle communication, a unique number is assigned to each traveling vehicle, and this unique number is used to communicate with each individual vehicle.

(c) Problems to be Solved by the Invention In the conventional road-to-vehicle communication described above, each vehicle is assigned a unique number, so when extending vehicle-to-vehicle communication to privately owned vehicles, it is difficult to determine the behavior of each vehicle. Since the assigned number can be immediately identified and it is also easy to determine who owns the item, there is a serious problem that there is a risk of infringing on privacy since the movements of individuals can be clearly seen. Ta.

This invention has been made in view of the above-mentioned problems, and aims to provide a road-to-vehicle communication system that can realize vehicle-to-vehicle communication even to privately owned vehicles without infringing on privacy. .

(d) Means and operation for solving the problem The road-to-vehicle communication system of the present invention is a system that includes a road device 1, an on-vehicle communication device 4, and a center device 3, in which the road device 1 includes each Installed on the road for each communication area,
The on-vehicle communication device 4 has a memory and is mounted on the vehicle, and the on-vehicle communication device 4 and the center device 3 can communicate via the roadside device 1 in each communication area. , the information regarding the car number is repeatedly transmitted, and the information regarding the car number is (a)
(b) If the car number is not given, it is the no car number; (b) If the car number is given, it is the given car number, and in response, the center device 3 sends The vehicle number information is received and stored in the memory, and the vehicle number information is the new vehicle number set by the center device 3 in the case of (a), and the vehicle number information is the new car number set by the center device 3 in the case of (b). In this case, when the car number is updated, the updated car number is
receives the information regarding the car number from the in-vehicle communication device 4, and in response, if the information regarding the car number is in (a) above, a new car number is sent in the case (b) above and the car number. When an update is made, the updated car number is sent to the in-vehicle communication device 4.

In this road-to-vehicle communication system, vehicle number information is repeatedly transmitted from a traveling vehicle. and,
When a car enters the communication area with the roadside device, the center device receives the non-vehicle number information via the roadside device. In response to this reception, the center device refers to the storage unit, extracts unused car number information, changes it in the storage unit as the car number information of the car currently communicating, and changes the car number information to that car. Sent. When a car that had previously transmitted car number information receives car number information from the center device, this car number information is stored in the car number information storage section. Thereafter, the vehicle number information stored in the vehicle number information storage section is transmitted from this vehicle, and communication between the center device and the vehicle is performed using this vehicle number information. In this road-to-vehicle communication system, when a car that has sent no vehicle number information to the center device arrives, the center device gives the empty vehicle number information stored in the storage section to the vehicle, and this number Since the communication is carried out, the number is not unique to the car, so even if it is a privately owned car, privacy will not be violated.

(E) Embodiments The present invention will be explained in detail below with reference to embodiments shown in the drawings.

FIG. 1a is a schematic diagram showing a system according to an embodiment of the invention. In FIG. 1a, reference numerals 1a and 1b are roadside devices, which are provided for communicating with vehicle-mounted communication devices 4a and 4b of vehicles 2a and 2b, etc., running on the road. Although only two roadside machines, 1a and 1b, are shown for convenience of explanation, many other roadside machines are installed at key locations. 3 is a center device that centrally manages the roadside devices 1a, 1b, etc. Note that the roadside machines 1a, 1
b transmits a weak radio wave of frequency 1 to cars 2a and 2b.
The in-vehicle communication devices 4a and 4b transmit weak radio waves of frequency 2 and communicate with each other. Also, the road machines 1a, 1b
In order to perform transmission and reception, as shown in FIG.
4, communication control units 15, 16, memory 17, modem 18, and control unit 19, and as shown in FIG. The device includes a section 43, a coupling section 44, a communication control section 45, and a memory 46, but since these structures themselves are well known, a detailed explanation will be omitted.

Since the road devices 1a, 1b and the center device 3 are controlled according to the control flow shown in FIG.
The operation of the embodiment shown in FIG. 1 will be explained with reference to FIG.
In FIG. 2, start A indicates the start of operation when giving a new number to a car, and start B indicates the start of operation when updating the car number.

For example, assuming that the car 2a approaches the roadside machine 1a and is given a new number, the roadside machine 1a
In step 10 of FIG. 2, it is determined whether there is communication. As shown in the time chart of FIG. 3, the on-board communication device 4a of the car 2a repeatedly transmits an unnumbered car number, but
If the roadside device 1a does not reach the communication area of the vehicle 2a, the roadside device 1a will not be able to receive the signal from the vehicle 2a.
At step 10, a enters the waiting state. When the vehicle 2a reaches the communication area of the roadside device 1a, that is, the point A in the time chart of FIG.
The determination is YES, and the process moves to step 11. In step 11, a message is sent to the center device 3 that a car without a car number has entered the communication area of the roadside device 1a. This corresponds to point B in the time chart of Figure 3. In step 12, the center device 3 determines whether the signal from the roadside device 1a is "no vehicle number information". In this case, the judgment is YES
Therefore, move on to step 13. In step 13, the center device 3 retrieves the car number (empty number) with the assigned flag OFF from its own storage unit.

As shown in FIG. 4, the storage section of the center device 3 is composed of at least a car number storage area m1 and an assigned flag area m2, and the car number storage area m1 stores car numbers CN1, CN2, CN3,... If these car numbers have already been assigned to any car, the corresponding flag Fi
is set to ON, and if no number has been assigned to any car yet, the corresponding flag Fi is set to OFF. Therefore, in step 13, a car number that has not yet been assigned to any car is retrieved.
Then, turn on the flag area corresponding to the car number retrieved in step 14. Subsequently, in step 15, the center device 3 transmits the retrieved vehicle number to the roadside device 1a. Steps 12 to 15 correspond to step C in the time chart in Figure 3.

In step 16, the roadside device 1a transmits the car number from the center device 3 to the car 2a. This step
16 corresponds to 2 in the time chart in Figure 3. The on-board communication device 4a of the car 2a is connected to the road device 1a in step 17.
The next car number is received and stored in the storage unit. This step 17 corresponds to E in the time chart of FIG. Thereafter, the in-vehicle communication device 4a of the vehicle 2a continues to transmit the assigned and memorized vehicle number at regular intervals (step 18). Then, the car number in the storage section of the car 2a is updated by the center device 3, or cleared after a certain period of time (for example, in one day).

If the car that has entered the communication area of the roadside device 1a has already been given a car number, the determination of “no car number information” in step 12 will be NO, and the process will proceed.
18 and the car continues to transmit its previous car number.

If the on-vehicle communication device 4a of the car 2a has already stored the car number and the center device 3 updates this to a new car number, the operation proceeds from start B in FIG. In step 19, the center device 3 clears all assigned flags and turns them OFF. Then, the roadside device 1a determines whether there is communication. If the car 2a has entered the communication area of the roadside device 1a, the determination is YES and the process moves to step 13. After that, follow the same steps as when assigning a new car number.
The operation proceeds from step 14 to step 17, and the new car number is stored in the storage section of the on-board communication device 4a of the car 2a.
The communication time chart in this case is as shown in Figure 5, and at point A, the roadside vehicle enters the communication area, and at point E, the new vehicle number is transmitted from the on-board communication device, as shown in Figure 3. You can think of it in the same way as in the case of .

FIG. 6 shows a control flow when the system shown in FIG. 1 is applied to a car location system. In this case, the storage unit of the center device 3 has an area m for storing the car number, as shown in FIG.
3 and area m that stores location information for each car number.
It has 4.

In Fig. 6, a car 2 is in the communication area of the roadside unit 1a.
If a enters, it is determined in step 21 whether there is communication, and if the determination is YES, step 22 is made.
Move to. In this step, the road device 1a receives the vehicle number from the on-vehicle communication device 4a of the vehicle 2a. Subsequently, in step 22, the roadside device 1a transmits the received vehicle number to the center device 3. At this time, the on-road device number is also transmitted as point information. Center device 3 is step 23
At step 24, the vehicle number and location information are received from the on-road vehicle 2a, and at step 24, these received information are stored in storage areas m3 and m4, respectively.

The same applies when a car, for example 2b, approaches a roadside vehicle at another location, for example 1b. step
In step 31, it is determined whether there is communication, and if the vehicle 2b enters the communication area, the determination is YES and the process goes to step 32.
At step 33, the vehicle number is received from the on-board communication device 4b of the vehicle 2b, and at step 33, the received vehicle number and location information are transmitted to the center device 3. The subsequent operation is the same as when a car approaches the roadside machine 1a. The center device 3 retrieves the car number and location information received in step 25 from the storage section and displays them. By displaying this, you can see where each car number is located.
You can tell at first sight.

In addition, the storage unit can store not only the car number and point information, but also the time, so that the route of a certain car,
It is possible to know the time required to travel from one point to another.

(f) Effects of the invention According to this invention, a traveling vehicle is assigned an arbitrary blank number stored in roadside equipment while traveling, and this number has no relationship with the user or driver of the vehicle. Since it is assigned and memorized without permission, the location of a car with a certain number can always be known from the point of view of roadside devices, central equipment, etc., but it is not possible to know whose car it is. cannot be infringed upon.

[Brief explanation of the drawing]

FIG. 1a is a schematic diagram of a system showing an embodiment of the present invention, FIG. 1b is a block diagram showing a roadside device of the system, FIG. Figure 2 is a diagram showing the control flow of the system shown in Figure 1, Figure 3 is a time chart for explaining the operation of the system shown in Figure 1, and Figure 4 is a diagram showing the center of the system shown in Figure 1. A diagram showing the arrangement of the storage section of the device, FIG. 5 is a time chart for explaining the update operation of the system shown in FIG. 1, and FIG. 6 is a diagram showing the case where the system shown in FIG. 1 is applied to a car location system. FIG. 7 is a diagram showing the arrangement of the storage section of the center device necessary to implement the control flow shown in FIG. 6. 1a, 1b...road device, 2a, 2b...driving vehicle, 3...center device, 4a, 4b...vehicle communication device, m1...assigned flag area, m2...assigned vehicle number storage area, m3... ...Car number information storage area,
m4...Point information storage area.

Claims (1)

[Claims] 1. Roadside device 1, in-vehicle communication device 4, and center device 3
A road-to-vehicle communication system comprising: a roadside device 1 installed on the road for each communication area; an on-vehicle communication device 4 having a memory and mounted on a vehicle; 4 and center device 3
can communicate via the roadside device 1 in each communication area, and the in-vehicle communication device 4 repeatedly transmits information regarding the vehicle number, and the information regarding the vehicle number is (a)
(b) If the car number is not given, it is the no car number; (b) If the car number is given, it is the given car number, and in response, the center device 3 sends The vehicle number information is the new vehicle number set by the center device 3 in the case of (a) above, and the car number information is the new car number set by the center device 3 in the case of (b) above. In this case, when the car number is updated, it is the updated car number, and the center device 3 receives information about the car number from the in-vehicle communication device 4, and in response, the information about the car number is In the case of b), when the new car number is updated in the case of b), the updated car number is transmitted to the in-vehicle communication device 4. road-to-vehicle communication system.