JPH06180799A - Method for information communication with on-road vehicle - Google Patents

Abstract

PURPOSE:To accurately inform an automobile which is traveling of whether or not there is an obstacle on the road by detecting whether or not there is the obstacle on the road from whether or not there is an automobile in abnormal steering operation on the basis of received data under the control of a beacon by the road and sending a danger indication signal to automobiles in a transmission area. CONSTITUTION:Steering angle data on a local automobile by a steering angle sensor 11 and travel direction data by an azimuth sensor are sent by the transmitting and receiving circuit of the automobile, the transmitting and receiving circuit of the beacon 2 by the road receives those data, and a control part 13 detects the obstacle on the road. If there is the obstacle, the danger indication signal is sent to the automobiles in the transmission area. Consequently, the automobile is only equipped with a function which sending data on the steering angle and travel direction and receiving steering operation from the beacon by the road, and the existent beacon is used to accurately inform the automobiles 1 of whether or not there is the obstacle on the road by the simple constitution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road-vehicle information communication method for exchanging information between a roadside road beacon and a moving vehicle.

[0002]

2. Description of the Related Art In recent years, technologies necessary for improving automobile traffic and improving the use environment of automobiles have been developed. For example, when traveling automobiles pass each other, information is exchanged with each other by wireless communication. , Vehicle-to-vehicle communication, etc. that mutually inform the traffic conditions ahead, the fog occurrence status, the presence or absence of obstacles on the road, etc. are considered.

In this case, whether or not a traffic jam has occurred is determined by each control unit of each vehicle based on data obtained by various sensors and information collecting means installed in each vehicle, and these are determined. Results are automatically sent and received.

[0004]

However, there are few automobiles equipped with the system for transmitting and receiving information as described above, the probability that effective information is obtained is low, and the effectiveness of the system cannot be fully exhibited. It will be.

Therefore, the present invention has been made to solve the above-mentioned problems, and an object thereof is to make it possible to accurately convey the presence or absence of an obstacle on the road to a running vehicle with a simple structure. And

[0006]

According to a road-to-vehicle information communication method of the present invention, a vehicle is provided with a snake angle sensor, an azimuth sensor, and a transmission / reception circuit, and steering angle data of the vehicle detected by the snake angle sensor and the steering angle data of the vehicle. The traveling azimuth data of the vehicle detected by the azimuth sensor is transmitted by the transmission / reception circuit, the data from the vehicle in the reception area is received by the transmission / reception circuit of the roadside road beacon, and received by the control unit of the roadside road beacon. Detecting the presence / absence of an obstacle on the road based on the presence / absence of a vehicle carrying out an abnormal steering operation based on the data, and transmitting a danger notification signal to the vehicle in the transmission area from the transceiver circuit of the roadside road beacon when there is an obstacle. Is characterized by.

[0007]

According to the present invention, the steering angle data of the vehicle by the snake angle sensor and the traveling azimuth data by the azimuth sensor are transmitted by the transmission / reception circuit of the vehicle, and the data is received by the transmission / reception circuit of the roadside road beacon to control the control unit. Detects the presence of obstacles on the road, and if there is an obstacle, a danger notification signal is sent to the car in the transmission area.Therefore, the steering angle and heading data are transmitted to the car and the roadside beacon It suffices to provide a function for receiving a steering wheel operation, and by using an existing roadside road beacon, the presence / absence of an obstacle on the road can be accurately notified to the vehicle with a simple configuration.

[0008]

1 is a flow chart for explaining the operation of an embodiment of the road-to-vehicle information communication method of the present invention, and FIG. 2 is a schematic explanatory view.
3 is a partial block diagram, FIG. 4 is another partial block diagram, and FIGS. 5 to 8 are operation explanatory diagrams.

First, a brief description will be given. As shown in FIG. 2, each vehicle 1a, 1b, 1c has a snake angle sensor,
An azimuth sensor and a transmission / reception circuit are provided, each steering angle data detected by the snake angle sensor and each traveling azimuth data detected by the azimuth sensor are transmitted by the transmission / reception circuit, and the reception antenna 3 of the roadside road beacon 2 is transmitted.
The data from these automobiles 1a, 1b, 1c in the reception area are received by the transmission / reception circuit via the, and the presence / absence of an automobile that has performed an abnormal steering operation is detected based on the data received by the control unit of the roadside roadside beacon 2. The presence / absence of an obstacle on the road is detected, and when there is an obstacle, the danger notification signal is transmitted from the transmission / reception circuit of the roadside road beacon 2 to the vehicle in the transmission area via the transmission antenna 4.

Therefore, in the automobiles 1a, 1b, 1c that have received this danger notification signal, there is an obstacle on the one hand and it is necessary to avoid it. On the other hand, the oncoming vehicle has an abnormal steering wheel to avoid the obstacle. You can recognize that you need to be careful in order to operate.

By the way, the roadside roadside beacon 2 has a configuration as shown in FIG. 3, receives the transmission data from the automobile in the reception area through the reception antenna 3 having directivity, and transmits the nondirectional transmission antenna 4. A transmission / reception circuit 5 of weak specific low power for transmitting a danger notification signal to a vehicle in the transmission area via the memory 6, a memory 6 for sequentially storing the received steering angle and traveling direction data, and writing / reading of the memory 6 The MPU 7 as a control unit for controlling the transmission / reception circuit 5 to control the transmission / reception circuit 5 so that the obstacle notification signal is transmitted from the transmission / reception circuit 5 when it is determined that an obstacle is present on the road when there are many vehicles that perform an abnormal steering operation based on the received data. It has and.

Here, the transmission area and the reception area are as shown by the one-dot chain line and the two-dot chain line in FIG. 2, respectively, and the reception area is narrower than the transmission area. This is because it has directivity.

Next, the communication system installed in each automobile is constructed as shown in FIG. 4, and the snake sensor 11 for detecting the steering angle of the own vehicle and the direction sensor 12 for detecting the traveling direction of the own vehicle. And the ECU 13 to which the data from both sensors 11 and 12 are input, and the transmission / reception antenna 1 that is controlled by the ECU 13 and that receives data from both sensors 11 and 12.
4, and a transmission / reception circuit 15 of weak specific low power for transmitting the danger notification signal from the roadside road beacon 2 via the roadside.

By the way, when the received data is stored in the memory 6 in the roadside roadside beacon 2, for example, the memory 6 is used as a ring buffer, and steering angle data and traveling direction data received in n areas as shown in FIG. Is stored, and as shown in FIG. 6, the data is sequentially stored from the first area, and when the data reaches the nth area, the data is stored in the first area again and the old data is erased. And the latest n pieces of data are always stored in the memory 6.

At this time, the received data need not be data from the same vehicle.

The determination of the presence / absence of a vehicle with an abnormal steering wheel operation will be described. From the traveling direction data of each vehicle, steering angle data can be obtained for two types, an up lane and a down lane, as shown in FIGS. 7 and 8, respectively. Since it is classified and the installation position of the roadside roadside beacon 2 is known, it is possible to easily obtain the allowable steering angle ranges that are safe in each of the up lane and the down lane in the reception area. For example, in the reception area. The total allowable range of u steering angles in the up lane at θ _umin ~
_Assuming that θ _umax and the total allowable range of the d steering angles in the down lane are θ _dmin to θ _dmax , the total of the u steering angle data in the up lane shown in FIG.

[0017]

[Equation 1]

If the above condition is satisfied, it can be determined that there are few vehicles that perform an abnormal steering operation in the up lane, and that the vehicle is normally driving safely. The total steering angle data for d descent lanes shown in FIG.

[0019]

[Equation 2]

If the above condition is satisfied, it is possible to determine that the number of vehicles operating the steering wheel abnormally in the down lane is small and that the vehicle is normally driving safely.

Next, a series of control procedures will be described with reference to the flowchart of FIG.

First, the transmitting / receiving circuit 5 of the roadside road beacon 2
It is determined whether or not the steering angle and traveling direction data from the vehicle in the reception area is received (step S1). If the determination result is YES, the data received by the MPU 7 of the roadside road beacon 2 is stored in the memory 6 After being stored in the memory 6 (step S2), the MPU 7 causes the memory 6
Processing of the data stored in (step S
3).

Based on the data stored in the memory 6, the MPU 7 detects whether or not there are many vehicles that perform an abnormal steering operation in the reception area, and determines whether or not there is an obstacle on the road (step S4), the determination result is Y
If it is ES, the danger notification flag is turned on (step S
5) On the other hand, if the storage result is NO, the danger notification flag is turned off (step S6), after the process of step S5, after the process of step S6 and when the determination result of step S1 is NO, the MPU 7 causes It is determined whether or not the danger notification flag is on (step S7). If the determination result is NO, the process returns to step S1. If the determination result is YES, the transmission / reception circuit 5 controls each of the transmission areas within the transmission area. A danger notification signal is transmitted to the automobile (step S8), and then the process returns to step S1.

Therefore, the vehicle only needs to be provided with a function of transmitting steering angle data and traveling direction data and receiving a steering wheel operation from a roadside road beacon, and by using an existing roadside road beacon, a simple structure is achieved. The presence or absence of obstacles on the road can be accurately notified to the car.

By using the memory 6 as a ring buffer, it is possible to always control the presence or absence of an obstacle based on the latest n pieces of data.

It should be noted that the determination as to whether or not there are many vehicles that perform an abnormal steering operation is not limited to the method of the above embodiment.

[0027]

As described above, according to the road-to-vehicle information communication method of the present invention, the transmission / reception circuit for the roadside road beacon receives the steering angle and heading data from the automobile, and the control unit receives an obstacle on the road. The presence of obstacles is detected, and if there is an obstacle, a danger warning signal is transmitted to the transmitting vehicle. Therefore, by using the existing roadside road beacon, the presence of obstacles on the road can be accurately notified to the vehicle with a simple configuration. Therefore, it is extremely effective as a road-vehicle communication technology.

[Brief description of drawings]

FIG. 1 is a flowchart for explaining the operation of an embodiment of a road-to-vehicle information communication method of the present invention.

FIG. 2 is a schematic explanatory diagram of a system to which the present invention is applied.

3 is a block diagram of a portion of the system in FIG.

FIG. 4 is a block diagram of another portion of the system in FIG.

5 is an operation explanatory diagram of FIG. 2;

FIG. 6 is an operation explanatory diagram of FIG. 2;

FIG. 7 is an operation explanatory diagram of FIG. 2;

FIG. 8 is an operation explanatory diagram of FIG. 2;

[Explanation of symbols]

 1a, 1b, 1c Car 2 Roadside road beacon 5 Transmitter / receiver circuit 7 MPU (control unit) 11 Snake angle sensor 12 Direction sensor 15 Transmitter / receiver circuit

Claims (1)

[Claims] 1. A vehicle is provided with a snake angle sensor, an azimuth sensor, and a transmitting / receiving circuit, and the steering angle data of the own vehicle detected by the snake angle sensor and the traveling azimuth data of the own vehicle detected by the azimuth sensor are transmitted / received. The roadside roadside beacon transmission / reception circuit receives data from the vehicle within the reception area, and the roadside roadside beacon control unit determines whether the vehicle has an abnormal steering operation based on the received data. The presence / absence of the obstacle is detected, and when the obstacle is present, the danger notification signal is transmitted from the transmission / reception circuit of the roadside road beacon to the vehicle in the transmission area.