JP2009075703A - Communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology capable of transmitting information even to a vehicle having no wireless communication function. <P>SOLUTION: A communication system includes a communication unit 10, a detection unit 11, a notification unit 12, and a control unit 13. The communication unit 10 performs wireless communication, receives information sent from a vehicle having a wireless communication function, and transmits information to the outside. The detection unit 11 detects a vehicle having no wireless communication function in a predetermined area. The notification unit 12 emits sound and light, and sends a sign to a person in a vehicle having no wireless communication function by emitting sound and light. The control unit 13 controls the notification unit 12. Specifically, the control unit 13 transmits information to be informed to a vehicle by the communication unit 10 when a vehicle having no wireless communication function is detected by the detection unit 11, and controls the notification unit 12 so as to send a sign to the person in a vehicle having no wireless communication function when receiving the information to be informed to a vehicle by the communication unit 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a communication system for performing vehicle-to-vehicle communication and road-to-vehicle communication.

  In recent years, an increasing number of vehicles have a wireless communication function for communicating with roadside devices.

  Such a function is used, for example, in a system for automatically paying toll road charges such as ETC, a system for relaxing traffic jam information (for example, VICS), and the like.

  Communication between the roadside machine and the vehicle in this way is called road-to-vehicle communication, and research is actively conducted even now.

  On the other hand, research is also actively conducted on vehicle-to-vehicle communication in which communication is performed between vehicles.

  If such road-to-vehicle communication or vehicle-to-vehicle communication is used, a system that can support safe driving can be constructed. Taking vehicle-to-vehicle communication as an example, when the vehicle ahead is suddenly decelerated, the information “deceleration-rear danger” is transmitted from the vehicle, and the vehicle behind the vehicle receives the information. A wireless communication system that automatically decelerates can be constructed.

  However, even if the system can be constructed, there are always periods when both vehicles with and without wireless communication function exist before the system is fully spread. How to transmit information to a vehicle having no communication function is a big problem.

Among the inventions that include a technique for detecting a vehicle that does not have a wireless communication function, there are inventions described in Patent Document 1 and Patent Document 2 as inventions related to ETC communication technology. As an invention related to communication technology for alleviating traffic congestion, there is an invention described in Patent Document 3. Patent Document 4 describes a technique for a vehicle having a wireless communication function to obtain information on a vehicle that does not have the function. However, even if the invention described in any patent document is used, information cannot be transmitted to a vehicle that does not have a wireless communication function.
Japanese Patent Laid-Open No. 11-110686 JP 2004-295253 A JP 2006-309736 A JP 2005-301581 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique capable of transmitting information to a vehicle having no wireless communication function.

  In order to achieve the above object, the present invention adopts the following configuration.

  A communication system according to the present invention includes a communication unit that performs wireless communication, a notification unit that emits sound and / or light, a detection unit that detects a vehicle that does not have a wireless communication function within a predetermined area, and a control unit. And comprising.

  When the vehicle that does not have a wireless communication function is detected by the detection unit and information that should be notified to the vehicle is transmitted by the communication unit, the control unit The informing means is controlled so as to send a signal to a person riding in a vehicle having no communication function. Alternatively, the control unit may detect the wireless communication when a vehicle that does not have a wireless communication function is detected by the detection unit, and when the communication unit receives information to be notified to the vehicle. The informing means is controlled so as to send a signal to a person riding in a vehicle having no communication function.

  In the communication system according to the present invention, when information to be notified to the vehicle is transmitted by the communication means, or when such information is received by the communication means, the user gets on the vehicle having no wireless communication function. The notification means is controlled so as to send a signal to the person who is present. The notification means emits sound and / or light, and the sound and light can be sensed by humans. Therefore, information can be transmitted by voice or light even to a vehicle that does not have a wireless communication function (a person riding in the vehicle).

  The communication means receives position information of the vehicle transmitted from a vehicle having a wireless communication function among vehicles in the predetermined area, the detection means detects a vehicle in the predetermined area, and It is preferable to identify a vehicle that does not have a wireless communication function from the vehicles in the predetermined area based on the detected position of the vehicle and the received position information. Specifically, among the detected vehicles, a vehicle other than the vehicle corresponding to the position information received by the communication unit may be specified as a vehicle having no wireless communication function. Thereby, the number and position of vehicles which do not have a wireless communication function can be obtained.

  The communication means receives a radio wave transmitted from a vehicle having a wireless communication function among vehicles in the predetermined area, the detection means detects a vehicle in the predetermined area, and the detected vehicle It is preferable to identify a vehicle that does not have a wireless communication function from the vehicles in the predetermined area based on the position of the received radio wave and the arrival direction of the received radio wave. As a result, the position of the vehicle can be grasped regardless of the radio wave (information) transmitted from the vehicle having the wireless communication function.

  It is preferable that the detection means detects a vehicle from a captured image of the predetermined area. By detecting the vehicle using image analysis, the position of the detected vehicle can be accurately obtained.

  In addition, the communication system according to the present invention preferably includes a plurality of the notification units, and the control unit selects a notification unit that emits sound and / or light according to a position of a vehicle that does not have a wireless communication function. . Specifically, sound or light may be emitted toward a vehicle that does not have a wireless communication function. As a result, it is possible to make the person on the vehicle aware of the person rather than simply emitting sound or light.

  It is preferable that the notification means includes any one of a hazard lamp and a horn of a vehicle. Since the hazard lamp and the horn are provided in the vehicle from the beginning, the configuration can be simplified and the cost can be reduced.

  It is preferable that the notification means includes any one of a speaker, an electric bulletin board, and a warning lamp provided on the roadside. As a result, information can be transmitted to many vehicles (actually, people who are in the vehicle) at a time.

  In the communication system according to the present invention, information can be transmitted to a vehicle that does not have a wireless communication function.

<First Embodiment>
When a certain vehicle A suddenly decelerates, the information “deceleration-rear danger” is transmitted from the vehicle A by wireless communication. Then, consider a system in which one or more vehicles B traveling behind vehicle A within a region where the information reaches can decelerate by receiving the information (FIG. 1). Such a system exhibits its effects (effects such as supporting traffic safety) when all vehicles have a wireless communication function. Specifically, an effect such as preventing a ball hitting accident can be expected.

  However, before such a system becomes fully popular, there is always a period in which both vehicles having wireless communication functions and vehicles not having wireless communication functions are mixed (hereinafter referred to as vehicles equipped with wireless communication functions, wireless communication). Vehicles that do not have a function are called non-equipped vehicles). As shown in FIG. 1, when the mounted vehicle C and the non-mounted vehicle D are mixed as a plurality of vehicles B, the non-mounted vehicle D receives information transmitted from the vehicle A (the vehicle A is also a mounted vehicle). Since it cannot be performed, the deceleration timing is delayed, which may cause a ball hitting accident.

  Therefore, in the communication system according to the first embodiment, the vehicle detects a non-mounted vehicle among vehicles in a predetermined area. And when a non-mounted vehicle is detected, when the information transmitted by wireless communication from the mounted vehicle is received, a signal is sent by voice or light to a person boarding the non-mounted vehicle. Since voice and light are perceivable by humans, it is possible to expect the attention of a person who is on a non-equipped vehicle according to the signal, and in turn reduce traffic accidents. Note that the information transmitted from the mounted vehicle is information to be notified to the vehicle, for example, information such as “deceleration-rear danger” as described above.

(System overview)
FIG. 2 is a diagram showing an overall configuration of the communication system according to the present embodiment. As illustrated in FIG. 2, the communication system includes a communication unit 10, a detection unit 11, a notification unit 12, and a control unit 13. Each function and configuration will be described below. In the example of FIG. 2, the vehicle S 1 is considered in addition to the mounted vehicles A and C and the non-mounted vehicle D. Note that the wireless communication devices mounted on the vehicles A and C have a function of transmitting and receiving information such as “deceleration-rear danger” (in the present embodiment, the information is received). It is assumed that all functions constituting the system according to this embodiment are mounted only on the vehicle S1.

  The communication unit 10 has a function of performing wireless communication. In the present embodiment, the communication unit 10 receives information transmitted from the mounted vehicle (the mounted vehicle A or the mounted vehicle C).

  The detection unit 11 has a function of detecting a non-mounted vehicle within a predetermined area. A specific detection method by the detection unit 11 in the present embodiment will be described in detail later.

  The notification unit 12 has a function of emitting sound and light. In this embodiment, the alerting | reporting part 12 can apply the hazard lamp, horn, etc. of vehicle S1. The vehicle S1 emits a sound or light from the notification unit 12 to send a signal to a person who gets on the non-mounted vehicle D.

The control unit 13 is a function that controls the notification unit 12. Specifically, when the non-mounted vehicle is detected by the detection unit 11, the control unit 13 transmits information to be notified to the vehicle by the communication unit 10 or communicates information to be notified to the vehicle. When the signal is received by the unit 10, the notification unit 12 is controlled so as to send a signal to a person who gets on the non-mounted vehicle. In the present embodiment, the control unit 13 receives information such as “deceleration-rear danger” transmitted from the mounted vehicle (for example, the mounted vehicle A) by wireless communication when the detection unit 11 detects the non-mounted vehicle. In such a case, the notification unit 12 is controlled so as to blink the hazard lamp or sound a horn.

  The vehicle S1 may include a plurality of notification units 12. For example, both the hazard lamp and the horn may be used as the notification unit 12, and the control unit 13 may select whether the hazard lamp blinks or the horn is sounded according to the position of the non-mounted vehicle.

(Detection method)
A specific detection method by the detection unit 11 will be described with reference to FIG.

  In the present embodiment, it is assumed that the on-board vehicle periodically transmits its position information by wireless communication (for example, the position information is transmitted at a frequency of once / 100 msec).

  Moreover, the detection part 11 is provided with the function to detect the vehicle (both a mounted vehicle and a non-mounted vehicle) in a predetermined area | region. As a function of detecting a vehicle in a predetermined area by the detection unit 11, a technique for detecting a vehicle using a laser, a radar, a sonar, or the like, which is used in a pre-crash safety system or the like, can be applied. . In the present embodiment, the vehicle around the detection unit 11 is detected using the vehicle detector 20 that detects the vehicle using a radar. Therefore, the “predetermined area” described above is “around the detection unit 11”.

  In the example of FIG. 3, the vehicle S1 includes vehicle detectors 20 in eight directions (specifically, this is realized by including the vehicle detectors 20 at eight locations on the side surface of the vehicle S1). As shown in (a), it is assumed that eight of the vehicles 21 to 28 are detected by the vehicle detector 20. The vehicle 21 is positioned in front of the vehicle S1, the vehicle 22 is positioned in front of the vehicle S1, the vehicle 23 is positioned on the right side of the vehicle S1, the vehicle 24 is positioned on the right rear side of the vehicle S1, and the vehicle 25 is Located behind S1, the vehicle 26 is located on the left rear side of the vehicle S1, the vehicle 27 is located on the left side of the vehicle S1, and the vehicle 28 is located on the left front side of the vehicle S1.

  And the communication part 10 receives the positional information transmitted by radio | wireless communication from the mounted vehicle among the vehicles 21-28. In the present embodiment, it is assumed that the position information is position coordinate information (for example, a GPS value) of the transmission source vehicle.

  The vehicle S1 can grasp which position the received position information corresponds to the vehicle S1 by comparing its own position information with the position information received from the mounted vehicle. Specifically, from the difference between the position information of the vehicle S1 and the position information received from another mounted vehicle, it is determined where the other vehicle exists in the surrounding eight directions. In the example of FIG. 3B, the vehicle S1 receives position information corresponding to the front, right side, right rear, rear, and left front, and determines that the vehicles 21, 23, 24, 25, and 28 are mounted vehicles. To do. Therefore, among the vehicles 21 to 28, vehicles other than the above-described vehicles (vehicles 22, 26, 27) are specified as non-mounted vehicles (FIG. 3B). By specifying non-mounted vehicles in this way, it is possible to grasp not only the number of non-mounted vehicles but also the positions.

(System flow)
Next, an example of a specific system flow will be described with reference to the schematic diagram of FIG. 4 and the sequence diagram of FIG. In the example of FIGS. 4 and 5, the vehicle S1, the mounted vehicles A and C, and the non-mounted vehicle D are considered as in FIG. As shown in FIG. 4, the traveling order is the order of the mounted vehicle A, the mounted vehicle C, the non-mounted vehicle D, and the vehicle S1 from the top.

  In the example of FIGS. 4 and 5, the flow of the system when the mounted vehicle A suddenly decelerates will be described.

  First, when the mounted vehicle A suddenly decelerates (step S11), information “deceleration-rear danger” is transmitted from the mounted vehicle A to the outside by wireless communication (step S12).

  Next, the vehicle S1 and the mounted vehicle C receive the information (step S13). As shown in FIG. 4, since the vehicle S1 and the mounted vehicle C are located behind the mounted vehicle A, they decelerate after step S13 (step S14). However, there is a non-mounted vehicle D immediately in front of the vehicle S1, and as described above, the non-mounted vehicle D cannot receive the information transmitted from the mounted vehicle A, so the mounted vehicle A suddenly decelerates. It takes time to realize this, and the timing of deceleration is delayed. Therefore, in the present embodiment, a signal that can be sensed is sent from the vehicle S1 to the non-mounted vehicle D even if it does not have a wireless communication function. In addition, the control part 13 mounted in vehicle S1 sounds a horn when sending a signal to the vehicle ahead, and blinks a hazard lamp when sending a signal to the vehicle behind.

  Since the vehicle S1 knows in advance by the function of the detection unit 11 that the vehicle ahead is a non-mounted vehicle D, the vehicle S1 sounds a horn (step S15). Thereby, a cue can be sent to the person who has boarded the non-mounted vehicle D. In addition, the process of step S14 and step S15 may replace order, and may be performed simultaneously.

  In the present embodiment, the case where only the vehicle S1 is equipped with all the functions constituting the system according to the present embodiment has been described, but the vehicle C may also be equipped with the function. Thereby, as shown in FIGS. 6 and 7, the vehicle C recognizes that the rear vehicle is a non-mounted vehicle, and blinks the hazard lamp (step S16). That is, a signal is sent to the person who gets on the non-mounted vehicle D by a horn from the rear and a hazard lamp from the front. Thereby, the person boarding the non-mounted vehicle D can notice a signal more reliably.

<Second Embodiment>
Consider a system in which information indicating that “the signal will soon turn red” is transmitted from the roadside unit S2 near the traffic signal by wireless communication, and one or more vehicles B within the reach of the information receive the information (see FIG. 10). If such a system is used, when all vehicles have a wireless communication function, all the vehicles are controlled according to the change in the signal of the traffic light, or the signal of the traffic light changes to the person who is on the vehicle. Can be grasped. If the person on board grasps the change in the signal of the traffic light, it leads to prevention of traffic accidents.

  However, as described in the first embodiment, there is a period in which both the mounted vehicle and the non-mounted vehicle are mixed in the system diffusion stage. As shown in FIG. 10, when the mounted vehicle C and the non-mounted vehicle D coexist as the plurality of vehicles B, the non-mounted vehicle D cannot receive the information transmitted from the roadside device S2. The change in the signal cannot be grasped. Furthermore, if the non-mounted vehicle D is immediately behind the large vehicle, the traffic light cannot be confirmed, which may cause a traffic accident.

  Therefore, in the communication system according to the second embodiment, the roadside device detects a non-mounted vehicle among vehicles in a predetermined area. When a non-mounted vehicle is detected, when information to be notified to the vehicle is transmitted by wireless communication, a signal is sent by voice or light to a person riding on the non-mounted vehicle. The information to be notified to the vehicle is information such as “deceleration-rear danger” described in the first embodiment, and information such as “the signal will turn red soon” described above.

(System overview)
FIG. 8 is a diagram showing the overall configuration of the communication system according to the present embodiment. As shown in FIG. 8, the communication system includes a communication unit 10, a detection unit 11, a notification unit 12, and a control unit 13. Since each function is the same as that of the first embodiment, only different points will be described. In the example of FIG. 8, the non-mounted vehicle D, the mounted vehicle C, and the roadside machine S2 are considered. Note that the wireless communication device mounted on the mounted vehicle C has a function of receiving information transmitted from the roadside device S2, and all the functions constituting the system according to the present embodiment are in the roadside device S2. It shall be installed.

  In the present embodiment, the communication unit 10 receives information transmitted from the mounted vehicle C.

  A specific detection method by the detection unit 11 in the present embodiment will be described in detail later.

  In the present embodiment, the notification unit 12 is a speaker, an electric bulletin board, a warning light, or the like provided on the road side. The alerting | reporting part 12 sends a signal to the person boarding a non-equipped vehicle by emitting an audio | voice and light. Specifically, the speaker should utter a sound such as “the signal will soon turn red”, or the message board will display the message “the signal will soon turn red” The warning light may be turned on when the signal turns red. It is also preferable to provide a sign such as “the signal will soon turn red” near the warning light. By doing so, a person on the vehicle can grasp that a signal from a speaker, an electric bulletin board, a warning light, or the like is a signal that the signal changes.

  In this embodiment, the control unit 13 detects a non-mounted vehicle by the detection unit 11 and transmits information such as “the signal will soon turn red” to the outside by wireless communication. The notification unit 12 is controlled so as to emit, display on an electric bulletin board, or turn on a warning lamp.

  The roadside device S2 may include a plurality of notification units 12. For example, all of a speaker, an electric bulletin board, and a warning light are used as the notification unit 12 and are installed at different positions. And the control part 13 may select the alerting | reporting part 12 operated according to the position of a non-mounted vehicle.

(Detection method)
The specific detection method by the detection part 11 is demonstrated using FIG.

  In this embodiment as well, as in the first embodiment, it is assumed that the mounted vehicle periodically transmits its own position information.

  The detection unit 11 includes an imaging device 60 that captures an image of a predetermined area (FIG. 9), and a vehicle (both mounted vehicle and non-mounted vehicle) is analyzed by image analysis from an image 66 captured by the imaging device. It has a function to detect. Therefore, the “predetermined area” described above is “an imaging area of the imaging device 60”.

  In the example of FIG. 9, it is assumed that five vehicles 61 to 65 are detected from the image 66 captured by the imaging device 60. The detection result includes not only the number of vehicles but also the position coordinates of each vehicle.

  And the communication part 10 receives the positional information transmitted by radio | wireless communication from the mounted vehicle among the vehicles 61-65. In the present embodiment, the position information is information on the position coordinates of the transmission source vehicle.

  The roadside machine S2 compares the detection result of detecting the vehicle from the image with the position information received from the mounted vehicle, thereby determining from which vehicle in the image the received position information is transmitted. It is possible to grasp which vehicle has a wireless communication function. Therefore, among the vehicles detected from the image, vehicles other than the mounted vehicle are identified as non-mounted vehicles. Furthermore, by using image analysis, it is possible to grasp the vehicle type and the like. Based on the vehicle type and positional relationship of each vehicle, a vehicle in a dangerous position (for example, because the vehicle is in front of a large vehicle, Vehicles that cannot be confirmed) can be identified. The system may be configured to operate when a vehicle in such a dangerous position is identified.

(System flow)
Next, an example of a specific system flow will be described with reference to the schematic diagram of FIG. 10 and the sequence diagram of FIG. In the example of FIGS. 10 and 11, the roadside machine S2, the mounted vehicle C, and the non-mounted vehicle D are considered as in FIG. As shown in FIG. 10, the roadside machine S2 is installed on the roadside, and the non-mounted vehicle D is traveling behind the mounted vehicle C. The mounted vehicle C is a large vehicle, and the non-mounted vehicle D is in a situation where the front cannot be confirmed.

  In the example of FIGS. 10 and 11, the flow of the system when the signal of the traffic light 70 changes to red will be described.

  First, the roadside device S2 transmits information that “the signal will soon turn red” to the outside by the function of the communication unit 10 (step S21).

  Next, the mounted vehicle C receives the information (step S22). Then, the mounted vehicle C displays the information on a monitor such as a car navigation system provided, or emits a voice representing the information from a speaker (step S23). Thereby, the person boarding the onboard vehicle C can grasp the timing when the signal of the traffic light changes and can drive. However, as described above, the non-mounted vehicle D cannot receive the information transmitted from the roadside device S2, and thus cannot grasp the change in the signal of the traffic signal 70. Furthermore, since the front mounted vehicle C is a large vehicle, the non-mounted vehicle D cannot confirm the traffic light 70, which may cause a traffic accident. Therefore, in this embodiment, a signal that can be sensed even if the non-mounted vehicle D does not have a wireless communication function is sent from the roadside device S2.

  Since the roadside machine S2 grasps in advance the presence of the non-mounted vehicle D by the function of the detection unit 11, the roadside machine S2 turns on the warning lamp 71 (step S24). The warning light 71 is provided with a sign stating “When the warning light is lit, the signal changes to red”. In step S24, the warning light 71 signals the person who is on the non-mounted vehicle D. Can be signaled as a signal change. In addition, the process of step S21 and step S24 may replace order, and may be performed simultaneously.

  By configuring the system as described in the first embodiment or the second embodiment, information can be transmitted to the non-equipped vehicle. And the occurrence of a traffic accident can be suppressed by sending a signal to the non-mounted vehicle.

  Note that, as in step S <b> 23 of FIG. 11, the mounted vehicle C that has received the information to be notified to the vehicle does not have to transmit the information to the person on the vehicle. For example, the speed of the vehicle may be controlled to a speed suitable for a change in the signal of the traffic light while receiving the information. By doing so, it is possible to suppress the operation of “passing at a speed when the traffic light changes”, and it can be expected that the system will be safer.

In the second embodiment, a case has been described in which a forward traffic signal or the like cannot be confirmed because there is a large vehicle ahead. However, the present invention is not limited to this case. For example, a roadside machine may be installed in front of an intersection with poor visibility, and information such as `` Future and intersection '' and `` There is an approaching vehicle at the intersection '' may be notified, or the roadside machine may be in front of a sharp curve It may be installed and notified of information such as “Further, sharp curve”.

<Modification>
In the first embodiment and the second embodiment, respectively, “when the communication unit 10, the detection unit 11, the notification unit 12, and the control unit 13 are mounted on the vehicle”, “the communication unit 10, The case where the detection unit 11, the notification unit 12, and the control unit 13 are mounted is described. However, the present invention is not limited thereto, and the system may be configured in any way as long as the communication unit 10, the detection unit 11, the notification unit 12, and the control unit 13 are combined. Below, the modification of the system comprised by the function mentioned above is demonstrated.

<Modification 1>
The modification 1 is an example of “when the communication unit 10, the detection unit 11, the notification unit 12, and the control unit 13 are mounted on the vehicle”, as in the first embodiment. However, the notification unit 12 is not controlled when the communication unit 10 receives information transmitted from the mounted vehicle, but is controlled when the communication unit 10 transmits information to the outside.

  As a specific example, consider a case where the vehicle S1 includes a communication unit 10, a detection unit 11, a notification unit 12, and a control unit 13, and the vehicle immediately behind the vehicle S1 is a non-mounted vehicle D. When the vehicle S1 suddenly decelerates, information “deceleration—rear danger” is transmitted to the outside by the function of the communication unit 10. Further, since the vehicle S1 knows that the vehicle behind is the non-mounted vehicle D by the function of the detection unit 11, the vehicle S1 signals the non-mounted vehicle D by the function of the notification unit 12 when transmitting the information. send.

<Modification 2>
The modified example 2 is an example of “when the communication unit 10, the detection unit 11, the notification unit 12, and the control unit 13 are mounted on the roadside machine” as in the second embodiment. However, the notification unit 12 is not controlled when the communication unit 10 transmits information, but the notification unit 12 is controlled when the communication unit 10 receives information transmitted from the mounted vehicle.

  As a specific example, consider a case where the roadside machine S2 includes a communication unit 10, a detection unit 11, a notification unit 12, and a control unit 13, and a mounted vehicle A and a non-mounted vehicle D exist in a predetermined area. Note that the non-mounted vehicle D is behind the mounted vehicle A to some extent. When the mounted vehicle A suddenly decelerates, the information “deceleration-rear danger” is transmitted from the mounted vehicle A by wireless communication, and the roadside device S2 receives the information by the function of the communication unit 10. Since the roadside machine S2 grasps the existence of the non-mounted vehicle D by the function of the detection unit 11, when the information “deceleration-rear danger” is received, the function of the notification unit 12 signals the non-mounted vehicle D. Send.

<Modification 3>
Modification 3 is an example of “when the detection unit 11 is mounted on a vehicle and the communication unit 10, the notification unit 12, and the control unit 13 are installed on the roadside machine”.

As a specific example, the detection unit 11 is provided in the vehicle S1, the communication unit 10, the notification unit 12, and the control unit 13 are provided in the roadside machine S2, and the vehicle immediately behind the vehicle S1 is a non-mounted vehicle D. Consider a case. The vehicle S1 knows that the vehicle behind is the non-mounted vehicle D by the function of the detection unit 11, and transmits the grasped information to the roadside device S2. The roadside unit S2 receives information such as “deceleration-rear danger” transmitted by wireless communication from the mounted vehicle by the function of the communication unit 10, or transmits information such as “the signal will soon turn red”. When a signal is sent, a signal is sent to the non-mounted vehicle D by the function of the notification unit 12.

<Modification 4>
The modification 4 is an example of “when the detection unit 11 is mounted on the roadside machine and the communication unit 10, the notification unit 12, and the control unit 13 are installed in the vehicle”.

  As a specific example, the detection unit 11 is provided in the roadside machine S2, the communication unit 10, the notification unit 12, and the control unit 13 are provided in the vehicle S1, and the vehicle immediately behind the vehicle S1 is a non-mounted vehicle D. Consider a case. The roadside machine S2 grasps the presence of the non-mounted vehicle D by the function of the detection unit 11, and the grasped information is transmitted to the vehicle S1 by wireless communication. Therefore, the vehicle S1 transmits information “deceleration-rearward danger” by the function of the communication unit 10 or information “deceleration-rearward danger” transmitted by wireless communication from another vehicle (mounted vehicle). Or the information of “the signal will soon turn red” transmitted from the roadside device by wireless communication is sent to the non-equipped vehicle D by the function of the notification unit 12.

  As described above, various system configurations can be considered depending on how functions such as the communication unit 10, the detection unit 11, the notification unit 12, and the control unit 13 are installed. Note that the present invention is not limited to the above-described modification example, and any system may be used as long as the system is configured by combining the above functions.

  In the first embodiment and the second embodiment, specific examples have been described with respect to the method of detecting a non-mounted vehicle by the detection unit 11, but the processing by the detection unit 11 is not limited to this method. For example, the method described in the second embodiment may be used in the first embodiment. Specifically, this is possible if an imaging device is provided in the vehicle S1 and has a function of detecting the vehicle from the image. Further, without being limited to these methods, any method may be used as long as a non-mounted vehicle can be detected.

  In the first embodiment and the second embodiment, the case where the mounted vehicle transmits information indicating its own position coordinates as the position information by wireless communication has been described. It does not have to be coordinate information.

  For example, by providing the vehicle S1 and the roadside device S2 with a plurality of receiving antennas, it is possible to grasp from which direction the information transmitted from the mounted vehicle has come.

  Specifically, the reception strengths of the plurality of antennas are compared, and it can be considered that the antennas have arrived from the direction of the antenna showing the strongest strength. If the number of antennas is increased or the rotation is performed with reference to the center positions of a plurality of antennas, the direction of arrival can be known more accurately.

  Since the position of the vehicle (both the mounted vehicle and the non-mounted vehicle) within the predetermined area can be grasped by the above-described method (such as radar or image analysis), the position of the vehicle within the predetermined area By comparing the arrival direction of the information, it is possible to grasp which vehicle has transmitted the information. Therefore, a non-mounted vehicle can be specified. That is, a non-mounted vehicle can be identified no matter what information the mounted vehicle transmits.

  In the above embodiment, the case of using information such as “deceleration-rear danger” or “the signal will turn red soon” has been described, but any information should be notified to the vehicle. Good. For example, as described above, it may be information for suppressing traffic accidents such as “Further intersection, ahead”, “There is an approaching vehicle”, “Further corner, sharp curve”, “Further traffic congestion”, “Further traffic” It may be information for smoothing traffic such as “under construction”.

FIG. 1 is a diagram illustrating an example of a vehicle-to-vehicle communication system. FIG. 2 is a diagram illustrating an overall configuration of the communication system according to the first embodiment. FIG. 3 is a diagram illustrating an example of a detection method in the detection unit 11, FIG. 3A is a diagram illustrating a vehicle detection result by the vehicle detector 20, and FIG. It is a figure which shows the discrimination | determination result of a mounted vehicle. FIG. 4 is a schematic diagram showing a flow of the communication system in the first embodiment. FIG. 5 is a sequence diagram showing a flow of the communication system in the first embodiment. FIG. 6 is a schematic diagram illustrating a flow of a communication system in a modification of the first embodiment. FIG. 7 is a sequence diagram illustrating a flow of the communication system in the modification of the first embodiment. FIG. 8 is a diagram illustrating an overall configuration of a communication system according to the second embodiment. It is. FIG. 9 is a diagram illustrating an example of a detection method in the detection unit 11. FIG. 10 is a schematic diagram illustrating a flow of the communication system in the second embodiment. FIG. 11 is a sequence diagram showing a flow of the communication system in the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Communication part 11 Detection part 12 Notification part 13 Control part 20 Vehicle detector 21-28 Vehicle 60 Imaging device 61-65 Vehicle 66 Image 70 Traffic light 71 Warning light

Claims (7)

A communication means for performing wireless communication;
An informing means for emitting sound and / or light;
Detecting means for detecting a vehicle having no wireless communication function within a predetermined area;
Control means;
With
The control means includes
The vehicle that does not have the wireless communication function is detected by the detection unit, and the notification information to be notified to the vehicle is transmitted by the communication unit, or the notification information is transmitted by the communication unit. If received,
A communication system for controlling the informing means so as to send a signal to a person riding in a vehicle not having the wireless communication function. The communication means receives position information of the vehicle transmitted from a vehicle having a wireless communication function among vehicles in the predetermined area,
The detection means includes
Detect vehicles in a given area,
The communication system according to claim 1, wherein a vehicle that does not have a wireless communication function is identified from vehicles in the predetermined area based on the detected position of the vehicle and the received position information. The communication means receives radio waves transmitted from a vehicle having a wireless communication function among vehicles in the predetermined area,
The detection means includes
Detect vehicles in a given area,
The communication system according to claim 1, wherein a vehicle that does not have a wireless communication function is specified from vehicles in the predetermined area based on the detected position of the vehicle and the arrival direction of the received radio wave. The communication system according to claim 2, wherein the detection unit detects a vehicle from a captured image of the predetermined area. A plurality of the notification means,
The communication system according to any one of claims 1 to 4, wherein the control unit selects a notification unit that emits sound and / or light according to a position of a vehicle that does not have a wireless communication function. The communication system according to any one of claims 1 to 5, wherein the notification means includes any one of a hazard lamp and a horn of a vehicle. The communication system according to any one of claims 1 to 6, wherein the notification means includes any one of a speaker, an electric bulletin board, and a warning light provided on the roadside.

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