JPS5819041A - Car communication controlling system - Google Patents

Abstract

PURPOSE:To perform the confirmation of route and the measurement of running time, by providing a storage section storing a plurality of point information and time information for a running car and checking the content of storage of the running car from a center device. CONSTITUTION:Road machines 1a and 1b for the correspondence with road running cars 2a and 2b are located at suitable positions on road and the machines 1a and 1b are centralizedly controlled at a center device 3. The machines 1a and 1b and the cars 2a and 2b have transmitters/receivers 1 and 2 respectively and transmit electromagnetic waves in frequencies f1 and f2 for communication. The cars 2a and 2b have a memory 4 storing a plurality of point information and time information, and the memory performs first-in and first-out storage operation and stores the newest point and time information. The center device 3 picks up the stored information of the running cars are required and measures the confirmation of route of a plurality of points and traveling times.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle-to-vehicle communication control system for controlling communication between a road vehicle and a center device via a road device.

In the past, attempts have been made to apply vehicle-to-vehicle communication to various fields such as car location, route guidance, travel time measurement, and public car priority. Conventional vehicle-to-vehicle communication, for example, transmits vehicle number information and point information from one vehicle to the center device, and the center device stores the latest information in its storage unit, allowing each vehicle to travel on the road. Knows the vehicle's driving position. 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 storage unit for storing a plurality of point information and time information on the traveling vehicle side, and is configured so that the center device can check the stored contents of the traveling vehicle as necessary. It is an object of the present invention to provide a vehicle-to-vehicle communication control method that reduces the memory load on the device and allows route confirmation at multiple points and travel time measurement.

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

FIG. 1 shows a control system according to the present invention, in which roadside units la, i for communicating with road vehicles 2a and 2b are shown.
Place b in two suitable places, each road'-machine la, 11)
are centrally managed by the center device 3.

The traveling vehicles 2a, 2b and the road machines la, 1b are
It is equipped with transmitting and receiving equipment indicated by symbols 1 and 2.
a and lb transmit weak radio waves of frequency f1, and the traveling vehicle 2a
, 2I) transmit weak radio waves of frequency f2 to communicate with each other.

Each running vehicle 2a, 2b is given a unique vehicle number,
This vehicle number is stored in the storage unit 4 of the traveling vehicle. The storage unit 4 also has a storage area for storing a plurality of point information and time information, and in this embodiment, FIFO (First In Fir) is stored in the storage area.
st Out ) storage method to store the latest location and time information.

For example, assuming that the traveling vehicle 2a approaches the vehicle 1a on the road at point A, the traveling vehicle 2a ,
The operation of the road 1 machine 1a and the center device 3 will be explained.

In FIG. 3 (1), star ) 2A indicates the start of operation when the traveling vehicle 2a issues its own vehicle number, and in step 11 it is determined whether a certain period of time has elapsed, and if YES If the determination is NO, the running vehicle 2a will issue the vehicle number information (step 12), and if the determination is NO, the vehicle 2a will be in a state of waiting for notification to be issued.

Start lA, 3A in Figure 4 (1) and Figure 5 (1)
indicates the start of operation when the roadside device 1a and the center device 3 transmit and receive point information and time information. Running car 2
When a reaches the communication area of the roadside device 1a, in FIG. 4(1), the determination as to whether there is communication in step 13 becomes YES, and the process moves to step 14. The road-1 machine 1a receives the vehicle number information issued by the traveling vehicle 2a in step 14, and transmits the lever vehicle number information and point information indicating its own location to the center device 3 in step 15.

In step 16 of FIG. 5 (1), the center device 3 determines whether the parking lot number and location information has been received, and selects YES.
Based on the determination, each piece of information is stored in the storage unit (step 17).

As shown in FIG. 7(1), the storage unit of the center device 3 has a car number storage area m1 and a point storage area m2. By extracting this information from the storage unit and displaying it, each car You can check where the vehicle number is located.

Next, in step 18, the center device 3 reads the current time stored in the storage unit (the current time is rewritten as time passes), and in step 19, sends the point and time information to the aircraft 1a. Send.

In Figure 4 (1), step 2 is
The determination as to whether the point and time information of 0 has been received is YES, and in step 21 these pieces of information are transmitted to the traveling vehicle 2a.

Start 2B in FIG. 3(2) indicates the start of the operation when storing point and time information in the storage unit 4, and the determination of whether point and time information has been received in step 22 is Y.
ES, and stores this information in the storage unit 4 (step 23).

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 vehicle 2a passes the road machines 1a to 1g at each point. Transmission/reception and storage operations similar to those described above are performed with the center device 3 via the central device 3. Assuming that the storage unit 4 of the traveling vehicle 2a has storage areas n1 and n2 that can store, for example, six points and time information (Fig. 6), at point F, all the times from point A to point F are stored. Information is stored sequentially.

Next, when the vehicle 2a moves from point F to point G,
The transmission/reception operation described in 1. is performed with the center device 3 via the roadside device 1g at the point, and the point and time information at point G is stored in the storage section 4 of the traveling vehicle 2a. In this case, the FIFO storage method ζ Therefore, at the same time as point G information is taken in, the oldest information, that is, the point and time information at point A in this embodiment, is removed from the storage section.

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

In step 31 of FIG. 5(2), the mass center device sends a command signal to the road-Iz machine 1g at point G to send the stored information of the traveling vehicle 2a.

4 (2) (Here, in step 32, the determination of 'Is there a command to send stored information?' is YES.
Then, the vehicle 2a is requested to send the stored information (
Step 33).

In the traveling vehicle 2a, in FIG. 3(3), step 34
The determination of ``Is there a request to send stored information?'' is YES, and the stored information at point G is sent to roadside machine 1g (
Step 35).

In step 36 of FIG. 4(2), the determination as to whether the stored information has been received is YES, and the stored information of the traveling vehicle 2a is sent to the center device 3 (step 37).

In the center device 3, the determination in step 38 as to whether the stored information has been received is YES, and in step 39 this stored information is stored in the storage section of the center device 3 together with the vehicle number. FIG. 7(2) shows its stored state. Next, the center device 3 calculates the travel time between arbitrary points, and in step 40, the travel time between CF points, between GD points, and between GC points is calculated by calculating the time difference (t7) at each point.
It is obtained by calculating t6) ('y-L4) ('7-t3).

According to the present invention, as described above, since the traveling vehicle is provided with a storage unit that stores information on a plurality of points and time, the center device retrieves and confirms the stored information of the traveling vehicle as necessary, thereby determining the route of the plurality of points. Confirmation and travel time measurement can be performed, and since the information is stored in the traveling vehicle, the storage burden on the center device is reduced, achieving excellent effects that achieve the purpose of the invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the control system according to the present invention, FIG. 2 is an explanatory diagram showing the arrangement of the road units 1a to 1g, and FIG.
1) (2) +31 is a diagram showing the control flow in the traveling vehicle, Fig. 4 fil (21 is a diagram showing the control flow in the road machine, Fig. 5 (11f2+ is a diagram showing the control flow in the center device, Fig. 6) 11+21 is an explanatory diagram showing the memory contents of the traveling vehicle, and FIG. 7 is an explanatory diagram showing the memory contents of the center device.

Claims (1)

[Scope of Claims] ■ A plurality of on-road devices for communicating with two vehicles traveling on the road, and a center device for centrally managing one device for each road, and the vehicles traveling on the road are provided with a plurality of point information and times. When the vehicle enters the communication area of the vehicle, the center device transmits the current time to the vehicle through the vehicle, and also transmits the current time to the vehicle. A vehicle-to-vehicle communication control system characterized in that the storage unit stores location and time information. (2) The vehicle-to-vehicle communication control system according to claim 1, wherein the storage unit of the traveling vehicle performs a FIFO storage operation to store the latest information on a plurality of points and time.