JP2001307291A - Road-vehicle communication system and vehicle-mounted communication device - Google Patents

Abstract

(57) [Summary] [Problem] To transmit and receive different dedicated information for each traveling lane,
Provided is a road-to-vehicle communication system capable of ensuring traffic safety and smooth traffic. A roadside communication device transmits information such as traffic information including information for each traveling lane via an antenna.
The transmitted information is sent to the receiving unit 4 via the antenna 3 attached to the vehicle, and further sent to the signal processing unit 5. The signal processing unit 5 identifies the traveling lane based on the signal of the marker detector 6 and selects necessary information from the information received by the receiving unit 4. The output unit 7 outputs a traffic information signal including a lane-specific information, a warning signal, and the like to the driver by voice, display, and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road-to-vehicle communication device and a vehicle-mounted communication device for exchanging information between a vehicle and a group of roadside stations, and more particularly to a road-to-vehicle communication device capable of transmitting and receiving different information for each traveling lane. And a vehicle-mounted communication device.

[0002]

2. Description of the Related Art In order to secure traffic safety and smooth traffic, it is effective to provide information such as road information to a moving vehicle. Conventionally, such information is provided over a wide area. There are broadcast-based and broadcast-based communicators that provide information specific to traveling vehicles in a specific area.

[0003]

However, since all of the conventional devices provide the same information to vehicles traveling on a multi-lane road, there is a limit to the type and accuracy of the information to be provided. Was.

[0004]

According to the present invention, when information is transmitted from a roadside communication device to a traveling vehicle, information including information specific to the traveling lane is transmitted. On the vehicle side, the traveling lane detected by the traveling lane discriminating means is transmitted. In this configuration, information specific to the traveling lane is selected based on the discrimination signal.

Further, information transmitted from the roadside communication device to the vehicle includes detailed position information for each base marker and road shape information for estimating a traveling position to the next base marker.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is a diagram showing a schematic configuration of the present invention. Reference numeral 1 denotes a roadside communication device, which transmits information such as traffic information including information for each traveling lane to a vehicle traveling on the road via an antenna 2. The roadside communication device is arranged on the roadside on a predetermined basis, and necessary information is appropriately distributed from a central management center (not shown).

[0008] The transmitted information is sent to a receiving unit 4 via an antenna 3 attached to a vehicle, and further sent to a signal processing unit 5. The marker detector 6 detects the output of a base point marker laid below the road surface and having a plurality of bits of identification information. The output is sent to the signal processing unit 5. The signal processing unit 5 identifies the traveling lane based on the signal of the marker detector 6 and selects necessary information from the information received by the receiving unit 4. The output unit 7 outputs a traffic information signal including a lane-specific information, a warning signal, and the like to the driver by voice, display, and the like. Which output means is used can be selected according to the type of information to be transmitted. Further, depending on the function of the vehicle, various actuators of the vehicle may be driven by the output of the output unit 7 to directly control the vehicle.

A more detailed description will be given using an example of operation at an intersection as shown in FIG. In the vicinity of the intersection, there are 12 lanes from the first lane to the twelfth lane, and a base point marker for distinguishing each lane is laid at an appropriate position below the road surface of each lane (one in the figure). Marker 1
Only 3 to 16 are shown. ). The base point marker has a plurality of bits of identification information, and those having information having different information are individually laid. Therefore, a vehicle that passes over the base marker can automatically recognize the lane that has passed by determining the identification information of the marker detector 6. Specifically, an electromagnetic marker or the like can be used.

A transmission signal from the roadside communication device 1 (not shown in FIG. 2) is transmitted to a first antenna 11 and a second antenna 12.
Is transmitted to the running vehicle. The provision of two antennas is for ensuring transmission and reception of information, and may be one or more.

FIG. 3 shows an example of information provided from the roadside. Data having a structure as shown in FIG. 3 is sent from the receiving unit 4 to the signal processing unit 5. Following the header, information common to all lanes is sent, followed by information for each lane, along with tag information identifying each lane.

The common information is, for example, road surface information and information on weather. Now, when the vehicle passes through the position of the base point marker 14 while traveling on the fourth lane, the signal processing unit 5 recognizes that the vehicle is traveling on the fourth lane based on the identification information of the base point marker 14, so that the signal processing unit 5 transmits the information together with the common information. Select 4-lane information. The fourth lane information is, for example, a signal for outputting a voice such as “There is no right turn dedicated lane at the intersection ahead. Be careful of right turn vehicles.” Based on the selected signal, the output unit 7 Outputs audio.

[0013] In addition to the above example, the information for each lane is "An accident is currently being processed in this lane. Please change the lane.", "This lane is a right-turn-only lane. Please be careful." , "I am in the process of handling an accident. Please change lanes."

In the present system, since the base marker is provided for each lane, the vehicle position can be accurately known by transmitting accurate position information of the base marker for each lane. FIG. 4 is an example of a data structure in a case where position information is also transmitted. Traffic information and position information are transmitted as information for each lane. The position information is detailed position information for each base marker and road shape information for estimating a traveling position to the next base marker.

The base marker 15 provided on the fifth lane
When the road from to the next base marker (not shown) can be approximated by a substantially straight line, the position of the vehicle can be estimated by measuring the vehicle traveling distance from the base marker 15.
That is, the longitude XA and the latitude YA of the base marker 15 and the direction from the base marker 15 to the next base marker are the directions of θ ° counterclockwise from the true east direction, and the base marker 15
Assuming that the traveling distance of the vehicle after detection is L, the current position of the vehicle is represented by longitude X = XA + aLcosθ and latitude Y = YA + bLsin
It is represented by θ. Here, a is a coefficient for converting distance to longitude information, and b is a coefficient for converting distance to latitude information.
Therefore, as the fifth lane position information, XA, YA,
By transmitting a cos θ and b sin θ, the vehicle can obtain accurate longitude and latitude information according to the traveling distance.

In the above example, the case where information is received from the roadside communication device on the vehicle side has been described. However, information can be transmitted from the vehicle side to the roadside communication device. In this case, by adding a transmission tag specific to the lane and transmitting the signal, the roadside communication device can determine which lane the vehicle is from. If the roadside communicator can receive the information from the vehicle, it can recognize the degree of congestion in each lane, and based on that, "This lane has many left-turn traffic ahead. Please change lanes for straight-ahead vehicles . "," The left lane is congested ahead.
Note the lane change from the left. , Etc. can be transmitted.

FIG. 5 shows another configuration example, which is different from the configuration shown in FIG. 1 in that the reception information is selected by the reception unit 8 according to the traveling lane. Therefore, the processing content of the signal processing unit 9 is also simplified.

[0018]

As is clear from the above description, according to the present invention, since different information can be transmitted and received for each lane, a system which is extremely useful for ensuring traffic safety and smooth traffic can be realized. .

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of the present invention.

FIG. 2 is a diagram showing an example of operation at an intersection according to the present invention;

FIG. 3 is a diagram showing an example of a structure of data transmitted from a road side to a vehicle side at an intersection;

FIG. 4 is a diagram showing an example of a data structure in a case where position information is also transmitted from a roadside;

FIG. 5 is a diagram showing another configuration of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Roadside communication device 2, 3 ... Antenna 4 ... Receiving part 5 ... Signal processing part 6 ... Marker detector 7 ... Output part 8 ... Receiving part 9 ... Signal processing unit 11: first antenna 12: second antenna 13-16: base point marker

Claims (7)

[Claims] 1. A road-to-vehicle communication system for communicating between a vehicle running on a road and a roadside by a radio signal, wherein the vehicle is a running lane determining means for determining a running lane, and a vehicle-mounted communication device. The information supplied to the vehicle from the road side includes information specific to the driving lane, and the on-vehicle communication device selects the information based on the discrimination signal of the driving lane discriminating means. Road-to-vehicle communication system. 2. The road-to-vehicle communication system according to claim 1, wherein the traveling lane discriminating means includes a base point marker sensor for detecting a signal of a base point marker embedded for each lane below the road surface. system. 3. The road-to-vehicle communication system according to claim 1, wherein the information provided from the road side to the vehicle includes detailed position information for each base marker and the vehicle travel position up to the next base marker. A road-to-vehicle communication system including road shape information for estimation. 4. The road-vehicle communication system according to claim 3, wherein the road shape information is information for estimating a traveling position of the vehicle from a vehicle traveling distance from a corresponding base point marker. 5. An in-vehicle communication device provided in a vehicle running on a road and performing wireless communication with the road side, wherein the vehicle is switched from the road side to the vehicle based on a determination signal from a running lane determining means for determining a running lane. An in-vehicle communication device for selecting information specific to a traveling lane included in the supplied information. 6. The vehicle-to-vehicle communication device according to claim 5, wherein the information provided from the road side to the vehicle includes detailed position information for each base marker and a traveling position to the next base marker. An in-vehicle communication device including road shape information for estimation. 7. The vehicle-to-vehicle communication system according to claim 6, wherein the road shape information is information for estimating a traveling position of the vehicle from a traveling distance of the vehicle from a corresponding base point marker. Communication device.