JP6569413B2 - Vehicle reverse running detection system - Google Patents

Description

  The present invention relates to a vehicle reverse running detection system including an on-vehicle device mounted on a vehicle and a roadside device that is installed at a required position on a road and performs wireless communication with the on-vehicle device.

  In the field of ITS, vehicles (automobiles) are equipped with ITS in-vehicle devices that also serve as car navigation systems, and between ETC roadside devices installed at toll gates, ITS spot roadside devices installed at important points on the road, etc. A system that performs road-to-vehicle communication in Japan has been put into practical use. The ITS in-vehicle device includes a car navigation unit and a DSRC (Dedicated Short Range Communications) unit. The communication with the ETC roadside machine enables the passage of the ETC gate (automatic payment of highway tolls), and the communication with the ITS spot roadside machine allows VICS (Vehicle Information and Communication System (registered trademark) Information service can be provided.

  By the way, in the case of a car, there is sometimes a reverse run that runs in the opposite direction on a one-way road. For example, when returning from the highway service area to the main line, the driver mistakenly enters the approach area to the service area, or on the multi-lane road, the right lane is mistaken for the opposite (opposite) lane and the U There are cases where the driver makes a turn, or the driver misses the entry prohibition sign and enters the one-way road from the opposite side. Conventionally, a vehicle reverse running detection system using road-to-vehicle communication has been considered (see, for example, Patent Document 1).

  In the reverse running detection system of Patent Document 1, a roadside wireless device for detection / warning is installed on an approach road of a resting facility on an expressway, and when the vehicle enters, the roadside wireless device performs road-to-vehicle communication with the vehicle-mounted wireless device. And writing the discrimination information in the storage unit of the in-vehicle wireless device. When the vehicle re-enters the approach path, the roadside radio device performs road-to-vehicle communication with the in-vehicle wireless device. Instruction information for warning is sent. At the same time, the roadside wireless device notifies the other roadside wireless device for notification of the presence of the reverse running vehicle, and the roadside wireless device for notification indicates the presence of the reverse running vehicle to other passing vehicles by road-to-vehicle communication. A warning is provided.

JP 2009-140343 A

  However, in the system described in Patent Document 1, a warning notification is given to a vehicle in which reverse running is detected, and only the presence of the reverse running vehicle is notified to other vehicles. It was not an active measure. For this reason, there has been a situation in which the effect of preventing the occurrence of an accident due to a reverse running vehicle cannot be sufficiently obtained.

  The present invention has been made in view of the above circumstances, and an object of the present invention is a system that detects reverse running of a vehicle using road-to-vehicle communication, and is excellent in preventing accidents caused by reverse running vehicles. To provide a reverse running detection system.

In order to achieve the above-mentioned object, the vehicle reverse running detection system (1) of the present invention has an on-vehicle device (2) equipped with a communication means (7) mounted on the vehicle (C) and a traveling direction determined in one direction. 1st and 2nd roadside machine (3A, 3B) which is installed in the upstream and the downstream of the road section currently provided, respectively, and performs radio communications with the onboard equipment (2), and travels in the road section When the determination means (8, 6) for determining reverse running of the vehicle to be operated and the determination means (8, 6) provided in the vehicle (C) determine that the vehicle (C) is traveling backward And a warning means (8) for performing warning processing, wherein the determination means (8, 6) communicates between the first roadside machine (3A) and the vehicle-mounted device (2), and Monitor whether the communication between the second roadside device (3B) and the vehicle-mounted device (2) is performed in that order, and communicate in that order. If not, it is determined that the vehicle (C) is running backward, and the warning means (8) determines the risk level of the backward running vehicle (C0) that is determined to run backward. The first roadside machine (3A) obtains information on whether or not there is a vehicle (C0) determined to run backward on the downstream side of the road section. And a reverse running vehicle in the road section when communicating with the vehicle-mounted device (2) of the other vehicle (C) when the reverse running vehicle (C0) exists in the road section. (C0) is provided with a notification means (6) for notifying the reverse running vehicle information that the presence of (C0) exists, and when the other vehicle (C) receives the notification of the reverse running vehicle information, Notifying the driver of the presence of the reverse running vehicle (C0) and notifying the subsequent vehicle or the driver of the vehicle to that effect However, the notification to the following vehicle is characterized in that it includes lighting of a hazard lamp or lighting of a high-mount stop lamp (invention of claim 1).

  According to this, when the vehicle is traveling correctly in one direction on the road section, after communication is performed with the first roadside machine on the upstream side (entrance side) of the road section, Communication is performed with the second roadside device on the downstream side (exit side). On the other hand, when the vehicle runs backward on the road section, communication with the second roadside machine is suddenly performed. Therefore, it is possible to reliably determine the reverse running of the vehicle in the road section in which the traveling direction is determined to be one direction by the determining means.

  And if it is determined that the vehicle is running backward, warning processing is performed by the warning means, but it is not merely a notification, and the danger level of the reverse running vehicle is judged, and the risk level is determined accordingly. Warning processing is performed. The user can know the degree of danger according to the type of warning processing. Therefore, according to the present invention, it is a system that detects reverse running of a vehicle using road-to-vehicle communication, and has an excellent effect that it is possible to actively prevent an accident from occurring by a reverse running vehicle. .

The block diagram which shows the 1st Embodiment of this invention and shows the structure of the principal part of a reverse running detection system roughly Diagram showing road-to-vehicle communication Figure for explaining approach road to road service facility The flowchart which shows the process sequence of the reverse running determination which the control part of onboard equipment performs The flowchart which shows the processing procedure of the warning which the control section executes at the time of reverse running judgment The flowchart which shows the process sequence of the alerting | reporting which the control part of the onboard equipment of the vehicle which received the reverse running vehicle notification performs The flowchart which shows 2nd Embodiment and shows the process sequence of the reverse running determination which the control part of a 2nd roadside machine performs

(1) First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, as a road section in which the traveling direction is determined as one direction, an approach path when entering a road service facility (service area (SA) or parking area (PA)) on an expressway is defined as a vehicle. A specific example is a case where the vehicle travels. Moreover, in this embodiment, the car navigation interlocking type ETC (DSRC) vehicle-mounted device corresponding to the ETC 2.0 service is adopted as the vehicle-mounted device mounted on the vehicle.

  FIG. 1 schematically shows a hardware configuration of a vehicle reverse running detection system 1 according to this embodiment. The reverse running detection system 1 is configured as a road-to-vehicle communication system using road-to-vehicle communication. The This reverse running detection system 1 is connected to a vehicle-mounted device 2 mounted on a vehicle C (see FIG. 2), a roadside device 3 that performs road-to-vehicle communication with the vehicle-mounted device 2, and a large number of roadside devices 3 wired (or wirelessly). And an information center 4 for managing the roadside devices 3. Although not shown in detail, the information center 4 includes a server and a database, and distributes road traffic information (VICS information) and collects and uses probe information uplinked from the vehicle C. ing.

  The roadside machine 3 includes an ITS spot roadside machine installed at a key point of an expressway and an ETC roadside machine installed at a toll gate. The roadside machine 3 includes a wireless unit 5 and a control unit 6 that is configured by a computer and controls the whole. As shown also in FIG. 2, the said radio | wireless part 5 is a DSRC (Dedicated Short Range Communications) system between the onboard equipment 2 (the below-mentioned radio | wireless part 7) of the vehicle C which passes the vicinity (narrow-range radio | wireless communication range). It consists of a narrow-area wireless communication device that performs narrow-area wireless communication. Thus, supply of road traffic information (VICS information) and charge settlement processing in the ETC service are performed by narrow-area wireless communication with the vehicle-mounted device 2 of the vehicle C. As will be described in detail later, a first roadside machine 3A and a second roadside machine 3B are installed on an approach road R1 (see FIG. 3) to a road service facility on an expressway, and these are reverse running detection systems. Is configured.

  As shown in FIG. 1, the vehicle-mounted device 2 includes a wireless unit 7 as a communication unit and a control unit 8 that is configured by a computer and controls the whole. An ETC antenna 9 is connected to the wireless unit 7 and performs wireless communication with the roadside device 3 via the ETC antenna 9. Although not shown, the vehicle-mounted device 2 is also provided with a card connection unit to which an ETC / DSRC card is connected. The car navigation device 10 mounted on the vehicle C is connected to the vehicle-mounted device 2 so as to operate in cooperation.

  The car navigation device 10 includes a control unit (navigation ECU) 11 that is configured by a computer and controls the whole, and is connected to the control unit 11, a position detection unit 12, a map database 13, an operation switch unit 14, and a display device. 15, an audio output device 16, a buzzer 17, and the like. The control unit 11 is provided with a memory 18. Although not shown in detail, the position detector 12 includes various in-vehicle sensors such as a GPS receiver, a direction sensor, and a vehicle speed sensor, and detects the current position of the host vehicle C with high accuracy.

  The map database 13 stores map data necessary for navigation, such as road map data all over Japan, destination data for various facilities and stores, map matching data, and the like. The operation switch unit 14 is operated by a user such as a driver to perform various instructions and selections. A touch panel provided on the screen of the display device 15 and a mechanical type disposed around the display device 15. It is comprised including a switch.

  The display device 15 includes a display disposed in an instrument panel portion in the vehicle, and displays a map screen and various message screens. The voice output unit 16 includes a speaker or the like, and can output a synthesized voice obtained by reading out text data. The buzzer 17 outputs a warning sound to the user. Thus, the car navigation device 10 (the control unit 11) displays a location function for displaying the detected position of the host vehicle C together with the road map on the screen of the display device 15, and an appropriate route to the destination designated by the user. The route guidance function for searching and guiding is executed.

  Although not shown in detail, in this embodiment, a vibrator 19 is provided in the steering wheel portion of the vehicle C (or the backrest portion of the driver's seat), and the car navigation device 10 (the control unit 11) The vibrator 19 can be energized (on / off). At this time, the display device 15, the audio output unit 16, the buzzer 17, and the vibrator 19 of the car navigation device 10 are also used when performing reverse running warning processing as described later. Functions as a means.

  Furthermore, the car navigation device 10 (control unit 11) is connected to a preventive safety ECU 21 via an in-vehicle network 20 such as a CAN (Car Area Network). The preventive safety ECU 21 is configured to be able to control the hazard lamp 22, the accelerator 23, and the brake 24, and this also functions as warning means for performing reverse running warning processing, as will be described in detail later.

  Now, in the reverse running detection system 1 of this embodiment, on the upstream side (entrance side) and the downstream side (exit side) of the road section (the approach path R1 shown in FIG. 3) in which the traveling direction is determined in one direction, Each roadside machine 3 is installed. As shown in FIG. 3, when distinguishing these two roadside machines, the one located on the upstream side is referred to as the first roadside machine 3A, and the one located on the downstream side is referred to as the second roadside machine 3B. The control unit 8 of the vehicle-mounted device 2 (or the control unit 11 of the car navigation device 10) is located between the first roadside machine 3A and the second roadside machine 3B when traveling on the road section (entrance road R1). Based on the road-to-vehicle communication, the reverse running of the host vehicle C is determined and functions as a determination means.

  Here, FIG. 3 shows an approach road R1 portion for entering the parking lot P of the road service facility (service area (SA) or parking area (PA)) from the main line R0 on the expressway as a specific example. ing. On the main line R0, the vehicle C is traveling in the direction of arrow a (from left to right in the figure), and a one-way approach path R1 is provided to the parking lot P so as to branch from the main line R0. When the vehicle C enters the parking lot P, the vehicle C travels along the approach path R1 in the direction of arrow b. The first roadside machine 3A is installed on the upstream side (inlet side) of the approach path R1, and the second roadside machine 3B is installed on the downstream side (outlet side). On the other side of the parking lot P, a one-way exit (in the direction of arrow c) R2 is provided so as to join the main line R0.

  At this time, as will be described later in the explanation of the operation (flowchart explanation), the controller 8 of the vehicle-mounted device 2 communicates between the first roadside device 3A and the vehicle-mounted device 2, and the second roadside device 3B. Whether or not the communication with the vehicle-mounted device 2 is performed in that order is monitored, and when the communication is not performed in that order, it is determined that the host vehicle C is running backward. And the control part 8 of the onboard equipment 2 will notify the control part 11 of the car navigation apparatus 10, when it determines with the own vehicle C running backward, and will perform a warning process, and is warning. It also functions as a means. A vehicle determined to run backward is referred to as a backward running vehicle C0. In this case, the control unit 8 determines the risk level of the reverse running vehicle C0 (own vehicle) and performs a warning process according to the risk level.

  In the present embodiment, the control unit 8 determines the risk level step by step so as to increase the risk level as the vehicle speed increases according to the speed of the reverse running vehicle C0 (host vehicle). Specifically, for example, when the speed of the reverse running vehicle C0 is less than 30 km / h, the risk is low, and when the speed is 30 km / h or higher, the risk is high, and the determination is made in two stages. . When it is determined that the degree of risk is low, a reverse running notification is given to the driver of the reverse running vehicle C0 (own vehicle) as a warning process.

  Specifically, as notification to the driver, screen display of the display device 15, lighting / flashing of a lamp of the meter unit, sounding of the buzzer 17, sound output of the synthesized speech by the sound output device 16, steering wheel by the vibrator 19, Driver seat vibration, accelerator pedal reaction force generation, seat belt tightening, and the like are executed. On the other hand, when it is determined that the degree of danger is large, as warning processing, in addition to the above-described notification of reverse running to the driver, as vehicle control, lights are turned on and blinked, hazard lamps are turned on, accelerator 23 is turned off, Processing for forcibly stopping the reverse running vehicle C0, such as automatic operation of the brake 24, is executed.

  Further, as will be described later in the description of the operation, in this embodiment, the vehicle-mounted device 2 (the control unit 8) determines that the vehicle runs backward during communication between the vehicle-mounted device 2 and the second roadside device 3B. In this case, the in-vehicle device 2 immediately notifies the second roadside device 3B that the host vehicle is the reverse running vehicle C0. When the second roadside machine 3B receives the reverse running notification, the second roadside machine 3B transmits data indicating that the reverse running vehicle C0 exists in the road section (entrance road R1) to the information center 4. Then, the information center 4 transmits information indicating that the reverse traveling vehicle C0 exists on the downstream side to the first roadside machine 3A in the road section (entrance road R1).

  When the first roadside machine 3A (control unit 6) obtains information from the information center 4 that the reverse traveling vehicle C0 exists downstream of the road section (entry road R1), the first roadside machine 3A (control unit 6) enters the approach road R1. When the vehicle C communicates with the vehicle-mounted device 2, the reverse running vehicle information indicating that the reverse running vehicle C 0 exists in the road section (entrance road R 1) is notified. Accordingly, the first roadside machine 3A (control unit 6) has functions as an acquisition unit and a notification unit. At this time, when the first roadside machine 3A notifies the on-vehicle device 2 of the other vehicle C of the reverse running vehicle information, the speed of the reverse running vehicle C0 or between the other vehicle C and the reverse running vehicle C0. The degree of danger based on the separation distance (elapsed time from when the reverse running is determined) is also notified. In this case, for example, information indicating that the degree of danger is high when the speed of the reverse running vehicle C0 at the time of reverse running determination is equal to or higher than a predetermined speed (for example, 30 km / h) and that the degree of risk is low when the speed is lower than the predetermined speed. Also notified.

  And the other vehicle C (control part 8 of the vehicle equipment 2) which received the notification of reverse running vehicle information at the time of communication with the 1st roadside machine 3A is a reverse running vehicle with respect to the driver of the said vehicle C. The presence of C0 is notified, and the fact is notified to another subsequent vehicle C or a driver of the vehicle C. Specifically, as a notification to the driver that the reverse running vehicle C0 exists, the screen display of the display device 15, the sound of the buzzer 17, the voice output of the synthesized voice by the voice output device 16, the steering wheel by the vibrator 19, and the driving The seat seat can be vibrated. As a notification for another vehicle C that follows, a hazard lamp can be turned on, a high-mount stop lamp can be turned on, or notification can be made through inter-vehicle communication.

  Next, the operation of the above configuration will be described with reference to FIGS. When the vehicle C travels on an expressway, for example, when a road service facility such as an SA is used to take a break for an occupant, the vehicle C travels in an arrow b direction on an approach road R1 that branches off from the main line R0 as shown in FIG. And enter the parking lot P. In addition, after the break, the vehicle travels from the parking lot P on the exit route R2 in the direction of arrow c and merges with the main line R0. Here, when leaving the parking lot P, for example, the driver misunderstood the direction, and there is a risk of reverse running that travels in the opposite direction to the arrow b direction on the approach path R1.

  Therefore, in the present embodiment, the vehicle-mounted device 2 (control unit 8) mounted on the vehicle 2 performs road-to-vehicle communication with the roadside device 3 (the first roadside device 3A and the second roadside device 3B). Then, the presence or absence of reverse running of the host vehicle C is determined, and when it is determined that the vehicle is traveling backward, each device of the vehicle 2 is caused to execute a predetermined warning process. The flowchart of FIG. 4 shows the procedure for reverse running determination executed by the control unit 8 of the vehicle-mounted device 2. Moreover, the flowchart of FIG. 5 shows the detailed procedure of the warning process (step S13 of FIG. 4) which a control part performs at the time of reverse running determination, and the flowchart of FIG. 6 is the alerting | reporting process at the time of receiving a reverse running vehicle notification The detailed procedure of (step S6 of FIG. 4) is shown.

  That is, first in the flowchart of FIG. 4, in step S1, it is determined whether or not a communication link with the roadside device 3 has been established. If the link is established (Yes in step S1), it is determined in the next step S2 whether or not the communication partner is the first roadside device 3A. When the communication partner is the first roadside device 3A (Yes in step S2), information such as SA information is acquired from the first roadside device 3A by wireless communication in step S3. When information such as SA information is acquired from the first roadside machine 3A, the SA approach flag is set to “1” in step S4.

  Here, since the information transmitted from the first roadside machine 3A may include reverse traveling vehicle information (and risk level information), in the next step S5, the acquired information is reversed. A determination is made whether vehicle information is included. If the reverse vehicle information is notified from the first roadside machine 3A (Yes in step S5), a notification process is performed in the next step S6. Details of this notification processing will be described in detail in the flowchart description of FIG. If the acquired information does not include reverse vehicle information (No in step S5), the process directly returns to step S1.

  On the other hand, if the other party that established the communication link is not the first roadside device 3A (No in step S2), it is determined in step S7 whether the other party is the second roadside device 3B. The If the other party that established the communication link is not the second roadside machine 3B (No in step S7), the other party is the other roadside machine 3 (ETC gate roadside machine or another ITS spot roadside machine). Since there is, explanation is omitted, but each processing (other processing) is executed with step S8.

  When the communication partner is the second roadside machine 3B (Yes in step S7), communication with the second roadside machine 3B, for example, acquisition of road traffic information, etc. is performed. In the next step S9, it is determined whether or not the SA approach flag is “1”. If the SA entry flag is “1”, the SA entry flag is set to “0” in the next step S10, and the process returns to step S1. When the vehicle C is correctly traveling in one direction (arrow b direction) on the approach road R1, communication is performed with the first roadside machine 3A and then communication with the second roadside machine 3B. Therefore, it can be determined that the vehicle is traveling in the correct direction based on the fact that the SA approach flag is “1” during communication with the second roadside device 3B.

  On the other hand, if the SA approach flag is not “1” (“0”) in step S9 (No in step S9), it is determined in step S11 that the host vehicle is running backward. The In this case, as described above, when the vehicle is running backward (reverse running vehicle C0), communication with the second roadside machine 3B is suddenly performed from the parking lot P. During the communication with the roadside machine 3B, the reverse running vehicle C0 can be reliably determined based on the fact that the SA approach flag is “0”. If it is determined that the vehicle is running backward, in step S12, a signal indicating that the host vehicle is running backward is transmitted to the second roadside device 3B. In step S13, a warning process is performed on the reverse traveling vehicle C0.

  The flowchart in FIG. 5 shows the detailed procedure of the warning process in step S13 in FIG. First, in step S21, it is determined whether the vehicle speed of the reverse running vehicle C0 (own vehicle) is equal to or lower than a predetermined speed (for example, 30 km / h). If the vehicle speed of the host vehicle is equal to or lower than the predetermined speed (Yes in step S21), the degree of danger is determined to be “low”, and warning processing for the degree of danger “low” is executed in step S22.

  As warning processing at this time, notification to the driver is mainly performed, screen display of the display device 15, lighting / flashing of a lamp of the meter unit, sounding of the buzzer 17, sound output of synthesized speech by the sound output device 16, Vibrator 19 vibrates the steering wheel and the driver's seat, generates a reaction force of the accelerator pedal, and tightens the seat belt. Thus, the driver is informed that the host vehicle is running backward, and the driver can take measures such as stopping the host vehicle by approaching the shoulder.

  On the other hand, if the vehicle speed of the reverse running vehicle C0 (own vehicle) exceeds the predetermined speed (No in step S21), the degree of danger is determined to be “high”, and the danger is determined in step S23. A warning process of “large” is executed. The warning process in this case includes the reverse running vehicle C0 such as lighting and blinking of the light, lighting of the hazard lamp, turning off of the accelerator 23, automatic operation of the brake 24, etc. as vehicle control in addition to the notification to the driver in step S22 described above. A process for forcibly stopping is executed.

  The flowchart of FIG. 6 shows the details of the notification process executed by the control unit 8 when the reverse vehicle information (and risk information) is notified from the first roadside machine 3A in step S6 of FIG. The procedure is shown. That is, in step S31, it is determined whether or not the degree of danger due to the reverse traveling vehicle C0 is large. When the degree of risk is small (No in step S31), in the next step S32, a notification process to the effect that there is a reverse running vehicle C0 ahead is executed for the driver of the host vehicle C. As the notification processing, screen display of the display device 15, sounding of the buzzer 17, sound output of synthesized speech by the sound output device 16, vibration of the steering wheel and driver's seat by the vibrator 19, and the like are executed.

  On the other hand, when the degree of risk is large (Yes in step S31), in the next step S33, the notification process for the driver of the host vehicle C is performed in the same manner as in step S32 described above, The notification process for another vehicle C following the host vehicle C is executed. As a notification to another subsequent vehicle C, a hazard lamp is turned on, a high-mount stop lamp is turned on, a notification by inter-vehicle communication is performed. Through the above processing, the driver of the vehicle C that has entered the approach path R1 is notified that the reverse running vehicle C0 exists ahead, and appropriate measures can be taken. When the degree of danger is large, it is possible to notify the other vehicle further behind the existence of the reverse running vehicle C0.

  Thus, according to the reverse running detection system 1 of the present embodiment, the first roadside machine 3A and the second roadside machine 3B are provided on the approach road R1 whose running direction is determined in one direction, and the vehicle-mounted device 2 Since it is configured to monitor whether or not the communication between the two vehicles is performed in that order and determine the reverse running, the reverse running of the vehicle C can be reliably determined. If it is determined that the vehicle is running in reverse, the risk level of the reverse vehicle C0 is determined and warning processing corresponding to the risk level is performed. In the system that detects reverse running of C, it is possible to obtain an excellent effect that it is possible to actively prevent accidents caused by the reverse running vehicle C0.

  In particular, in the present embodiment, the greater the reverse vehicle C0 vehicle speed, the greater the risk of an accident and the greater the damage in the event of an accident, so that the higher the vehicle speed, the more dangerous the vehicle is. Since the risk level is determined step by step so as to increase the level, the risk level can be easily and reliably determined. At this time, the warning processing includes notifying the reverse running to the driver of the reverse running vehicle C0, and also includes a process of forcibly stopping the reverse running vehicle C0 when it is determined that the degree of danger is high. The occurrence of an accident can be effectively prevented without depending on the driving operation.

  In this embodiment, when it is determined that the host vehicle C is running backward, the vehicle-mounted device 2 indicates that the host vehicle C is running backward with respect to the second roadside device 3B. Configured to notify. As a result, the presence of the reverse running vehicle C0 becomes clear on the roadside machine 3 (information center 4) side, and various countermeasures can be taken. At this time, when the first roadside machine 3A acquires information indicating that the reverse traveling vehicle C0 is present on the approach road R1, the reverse traveling vehicle C0 is present on the approach road R1 during communication with the vehicle-mounted device 2 of the other vehicle C. Since it is configured to notify the reverse running vehicle information indicating that it exists, it is possible to notify the other vehicle C that the reverse running vehicle C0 is ahead, and to encourage the driver to communicate. Furthermore, the accident prevention effect is excellent.

  In addition, the first roadside machine 3A notifies the risk based on the speed of the reverse vehicle 0 or the separation distance between the other vehicle C and the reverse vehicle C0. C can also be informed of the degree of danger due to the reverse running vehicle C0, which is more effective. Furthermore, in this embodiment, the vehicle-mounted device 2 of the other vehicle C notifies the driver of the vehicle C of the presence of the reverse running vehicle C0 when it receives notification of the reverse running vehicle information, and follows. Since it is configured to notify that to another vehicle C or the driver of the vehicle C, the presence of the reverse running vehicle C0 can be promptly notified to the driver of another vehicle C that follows, It will be more effective in preventing accidents.

(2) Second Embodiment and Other Embodiments FIG. 7 shows a second embodiment of the present invention. The second embodiment is different from the first embodiment in that the reverse running is determined not by the vehicle-mounted device 2 but by the control unit 6 of the second roadside device 3B. In this case, as will be described in the following flowchart description, the control unit 6 of the second roadside machine 3B obtains the information on the SA approach flag stored in the vehicle-mounted device 2 through road-to-vehicle communication with the vehicle-mounted device 2. Based on the acquisition, it functions as a determination means for determining reverse running of the vehicle C. When it is determined that the vehicle C is running backward, the second roadside device 3B notifies the vehicle-mounted device 2 of the backward running vehicle C0 that the vehicle is running backward, and the information center. 4 is notified.

  The flowchart of FIG. 7 shows the procedure for reverse running determination executed by the control unit 6 of the second roadside machine 3B. That is, in step S41, it is determined whether a communication link with the vehicle-mounted device 2 has been established. When the link is established (Yes in step S41), information communication with the vehicle-mounted device 2 is performed in the next step S42. At this time, information on the SA approach flag (and information on the vehicle speed of the vehicle C) is transmitted from the vehicle-mounted device 2 to the second roadside device 3B. The division of road traffic information and the like can also be transmitted from the second roadside device 3B to the vehicle-mounted device 2.

  In step S43, it is determined whether the information on the SA approach flag acquired from the vehicle-mounted device 2 is “1”. If it is SA entry flag 1 (Yes in step S43), since communication is performed in the correct order, SA entry flag is set to “0” for vehicle-mounted device 2 in next step S44. Notification is performed.

  On the other hand, when the information of the SA approach flag acquired from the vehicle-mounted device 2 is not “1” (“0”) (No in Step S43), the vehicle C runs backward in Step S45. It is determined that And in step S46, communication with the onboard equipment 2 is performed, the reverse run notification is made to the onboard equipment 2 of the reverse running vehicle C0, and information on the vehicle speed of the reverse running vehicle C0 is acquired. In step S47, the information center 4 is notified of the presence of the reverse traveling vehicle C0 and its danger level (vehicle speed), and the process ends.

  Although not shown in the figure, in the vehicle-mounted device 2 that has been notified of reverse running from the second roadside device 3B, a warning process is executed as in the first embodiment. Further, the information center 4 notified of the existence of the reverse traveling vehicle C0 from the second roadside machine 3B provides information (and the degree of risk) that the backward traveling vehicle C0 exists downstream from the first roadside machine 3A. Information). Instead of notifying the information center 4 of the presence of the reverse traveling vehicle C0 and its danger level (vehicle speed) from the second roadside device 3B, the reverse traveling vehicle directly to the first roadside device 3A. You may comprise so that presence of C0 and its danger level (vehicle speed) may be notified.

  According to such 2nd Embodiment, the determination means which determines reverse running can be provided in the 2nd roadside machine 3B side (or information center 4 side) instead of the vehicle C side. At this time, during communication between the vehicle-mounted device 2 of the reverse running vehicle C0 and the second roadside machine 3B, the reverse running vehicle C0 can be notified that the reverse running vehicle C0 is running backward. The necessary warning processing can be performed, and processing on the roadside machine 3 (system 1) side can also be performed. Accordingly, as in the first embodiment, in the system that detects reverse running of the vehicle C using road-to-vehicle communication, it is possible to actively prevent accidents caused by the reverse running vehicle C0. The excellent effect can be obtained.

  Although not described in each of the above embodiments, when the reverse running of the vehicle C is determined, a reverse running notification to the driver of the reverse running vehicle C0 or another vehicle C is provided on the road side (reverse running vehicle C0). From outside). In this case, it is possible to output emergency sounds (sirens, synthesized speech, etc.), notify by emergency lighting (light), etc., notify by displaying characters and figures on the bulletin board, and the like. In each of the above embodiments, the reverse running detection system on the approach road R1 to the service facility on the highway is taken as an example. However, the present invention can be applied to all roads in which the running direction is determined in one direction. A similar system may be provided on the exit path R2 side.

  In the said embodiment, although the control part 8 of the onboard equipment 2 was set as the structure which performs reverse running determination etc., about reverse running determination, a warning process, etc., it is good also as a structure which the control part of a car navigation apparatus performs. Functions such as determination means may be provided in the information center. Furthermore, various means can be adopted for the reverse running determination, the warning process, the specific method of reverse running notification and notification, and the like. In addition, various modifications can be made to the hardware configuration of the reverse running detection system 1 such that the vehicle-mounted device and the car navigation device may be integrated. In addition, the present invention is not limited to the embodiment described above and shown in the drawings, and can be appropriately modified and implemented without departing from the scope of the invention.

  In the drawings, 1 is a reverse running detection system, 2 is a vehicle-mounted device, 3A is a first roadside machine, 3B is a second roadside machine, 4 is an information center, 5 is a radio unit, 6 is a control unit, and 7 is a radio unit. , 8 is a control unit (determination means, warning means), 10 is a car navigation device, 11 is a control unit, R1 is an approach road (road section), C is a vehicle, and C0 is a reverse running vehicle.

Claims (6)

A vehicle-mounted device (2) mounted on a vehicle (C) and provided with a communication means (7);
First and second roadside devices (3A, 3B) installed on the upstream side and downstream side of the road section in which the traveling direction is determined in one direction and performing wireless communication with the vehicle-mounted device (2) , respectively. When,
Determining means (8, 6) for determining reverse running of the vehicle traveling on the road section;
A warning means (8) provided in the vehicle (C) for performing a warning process when the determination means (8, 6) determines that the vehicle (C) is running backward,
The determination means (8, 6) includes communication between the first roadside device (3A) and the vehicle-mounted device (2), and the second roadside device (3B) and the vehicle-mounted device (2). Whether or not the communication between the vehicle and the vehicle (C) is performed in that order, and when the communication is not performed in that order, it is determined that the vehicle (C) is running backward,
The warning means (8) determines the danger level of the reverse running vehicle (C0) determined to run backward, performs warning processing according to the danger level,
The first roadside machine (3A) includes acquisition means (6) for acquiring information on whether or not a vehicle (C0) determined to run backward exists on the downstream side of the road section, and the road section When there is a reverse running vehicle (C0), the reverse running vehicle information indicating that the reverse running vehicle (C0) is present in the road section when communicating with the vehicle-mounted device (2) of the other vehicle (C). A notification means (6) for notifying,
When the other vehicle (C) receives the notification of the reverse running vehicle information, the other vehicle (C) notifies the driver of the vehicle (C) of the presence of the reverse running vehicle (C0) and another subsequent vehicle or A vehicle reverse running detection system characterized by notifying the driver of the vehicle to that effect, and the notification to the following vehicle includes turning on a hazard lamp or turning on a high-mount stop lamp .   The determination means is provided on the vehicle side. When it is determined that the vehicle is running backward, the vehicle is reversed from the vehicle-mounted device of the vehicle to the second roadside device. 2. The reverse running detection system for a vehicle according to claim 1, wherein the vehicle is notified that the vehicle is running.   The determination means is provided on the roadside machine side or on the information center side that manages the roadside machine, and when it is determined that the vehicle is running backward, the second roadside machine The vehicle reverse running detection system according to claim 1, wherein the vehicle running device is notified of reverse running.   The warning means judges the degree of danger step by step so as to increase the degree of danger as the vehicle speed increases in accordance with the speed of the reverse running vehicle, and performs processing according to the degree of danger. The vehicle reverse running detection system according to any one of Items 1 to 3.   The warning processing executed by the warning means includes notifying of reverse running to the driver of the vehicle, and includes processing for forcibly stopping the vehicle when it is determined that the degree of danger is high. The reverse running detection system for a vehicle according to any one of claims 1 to 4.   The notifying means of the first roadside device is based on the speed of the reverse running vehicle or the separation distance between the other vehicle and the reverse running vehicle when notifying the reverse running vehicle information to the vehicle-mounted device of the other vehicle. 6. The reverse running detection system for a vehicle according to any one of claims 1 to 5, wherein a risk level is also notified.

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