JP4274905B2 - Road-to-vehicle communication system, road-to-vehicle communication method, in-vehicle device, and roadside device - Google Patents

Description

  The present invention relates to a road-to-vehicle communication system, a road-to-vehicle communication method, a vehicle-mounted device mounted on a vehicle, and a roadside device that perform communication between the vehicle-mounted device mounted on the vehicle and the roadside device installed on the road side. It is related with the made roadside apparatus.

  In recent years, informatization has progressed in vehicles such as automobiles and vehicle traffic systems, and road-to-vehicle communication systems using wireless communication such as DSRC (Dedicated Short Range Communication) have been put into practical use. In this road-to-vehicle communication system, roadside devices connected to a communication network are installed along the road, and various types of information such as probe information and traffic condition information are exchanged with the vehicle-mounted device provided in the vehicle.

  The probe information includes information on the travel route and travel direction of the vehicle, and when presenting traffic condition information to the traveling vehicle, the vehicle information to be presented is presented in order to present appropriate information. It is necessary to recognize the travel route and the travel direction. One method of recognizing the traveling route and traveling direction of a vehicle is a method of providing a plurality of roadside devices whose transmission directions of radio waves are limited, and associating the roadside device with the traveling route and traveling direction of the vehicle. In such a system, a vehicle communicating with one roadside device can be recognized as a vehicle traveling in a specific direction on a specific travel route. And means for recognizing the running direction may not be provided.

  As a method for determining the traveling direction of a vehicle using a single roadside device, there is a “vehicle position detection method in a road-to-vehicle communication system” described in Patent Document 1. In this system, the moving direction of the vehicle is determined by transmitting a plurality of signal waves modulated with different code sequences in different directions from the roadside station.

  However, even when a plurality of roadside devices are provided for each route and direction, confusion may occur due to radio wave leakage, and if there are parallel roads such as highways and ordinary roads, which route is running It is often difficult to determine whether or not. In addition, when a plurality of roadside devices are provided, the facility becomes large, leading to an increase in cost. On the other hand, when using a plurality of signal waves modulated with different code sequences as described in Patent Document 1, it is necessary to perform complicated communication processing. It leads to cost increase.

JP-A-5-151497

  The present invention has been made in view of the above circumstances, and can easily and reliably acquire information indicating the travel route and travel direction of a vehicle on which the vehicle-mounted device of the communication partner is mounted on the road side. An object of the present invention is to provide an inter-vehicle communication system, a road-to-vehicle communication method, an in-vehicle device used for road-to-vehicle communication, and a roadside device.

  The road-to-vehicle communication system of the present invention performs communication between an on-vehicle device mounted on a vehicle and a road-side device installed on the road side, and the on-vehicle device is a vehicle on which the on-vehicle device is mounted. The travel history information stored in the travel history storage unit is communicated with the travel history storage unit that acquires the travel history information, the travel history storage unit that stores the acquired travel history information, and the roadside device. A communication control unit that transmits to a roadside device, the roadside device storing a determination information storage unit that stores passage status determination information indicating correspondence between travel history information and a travel route and a travel direction of the vehicle; A passage state determination unit that compares the received travel history information with the passage state determination information stored in the determination information storage unit and determines a traveling route and a traveling direction of the vehicle on which the vehicle-mounted device is mounted; It is.

  ADVANTAGE OF THE INVENTION According to this invention, the information which shows the traveling route and traveling direction of the vehicle by which the vehicle equipment of a communication other party is mounted can be acquired easily and reliably on the road side.

  In the road-to-vehicle communication system of the present invention, the travel history information includes the vehicle passing point information. According to the present invention, it is possible to easily acquire travel history information used to acquire information indicating a travel route and a travel direction.

  In the road-vehicle communication system according to the present invention, the passing point information is identification information given to each of the roadside devices, and the vehicle-mounted device receives the identification information of the roadside device when communicating with the roadside device. And stored as passing point information. According to the present invention, since the passing point information is acquired at the same time when the road-vehicle communication is performed, the acquisition of the travel history information is further simplified.

  In the road-to-vehicle communication system of the present invention, the passing point information includes road link information acquired by the vehicle. By using the road link information acquired by the vehicle-mounted device, information indicating the travel route and travel direction of the vehicle can be more easily and reliably acquired on the road side.

  In the road-to-vehicle communication system of the present invention, the traveling history information includes traveling direction information of the vehicle. According to the present invention, the travel history information can be easily generated in the vehicle, and it is not necessary to provide a special device on the road side in order to acquire the travel history information.

  In the road-to-vehicle communication system of the present invention, the travel direction information includes information obtained from GPS information indicating a travel position of the vehicle. According to the present invention, a GPS device included in a navigation device mounted on a vehicle can be used, and a special device for acquiring special travel history information is not necessary on the vehicle side.

  The road-to-vehicle communication method of the present invention performs communication between a vehicle-mounted device mounted on a vehicle and a roadside device installed on the road side, and the vehicle mounted with the vehicle-mounted device in the vehicle-mounted device. A travel history storing step for acquiring and storing the travel history information, a travel history transmitting step for transmitting the travel history information stored in the travel history storage step from the vehicle-mounted device to the roadside device, and a reception by the roadside device. The travel history information from the in-vehicle device is collated with passage condition determination information indicating correspondence between the travel history information, the travel route, and the travel direction, and the travel route and travel direction of the vehicle in which the on-vehicle device is mounted are determined. A passing situation determination step.

  ADVANTAGE OF THE INVENTION According to this invention, the information which shows the traveling route and traveling direction of the vehicle by which the vehicle equipment of a communication other party is mounted can be acquired easily and reliably on the road side.

  The vehicle-mounted device of the present invention is mounted on a vehicle and communicates with a roadside device installed on a road side, and a travel history acquisition unit that acquires travel history information of the vehicle, and the acquired A travel history storage unit that stores travel history information and a communication control unit that transmits the travel history information stored in the travel history storage unit to the roadside device during communication with the roadside device.

  ADVANTAGE OF THE INVENTION According to this invention, the system which can acquire easily the information which shows the traveling route and traveling direction of the vehicle by which the vehicle equipment of a communicating party is mounted can be comprised simply by the road side.

  The vehicle-mounted device of the present invention includes the vehicle history information that is the passing point information of the vehicle. According to the present invention, it is possible to easily acquire travel history information used to acquire information indicating a travel route and a travel direction.

  In the vehicle-mounted device of the present invention, the passing point information is identification information given to each of the roadside devices, and when communicating with the roadside device, the identification information of the roadside device is received and stored as passing point information. Including things. According to the present invention, since the passing point information is acquired at the same time when the road-vehicle communication is performed, the acquisition of the travel history information is further simplified.

  In the vehicle-mounted device of the present invention, the passing point information includes road link information acquired by the vehicle. By using the road link information acquired by the vehicle-mounted device, information indicating the travel route and travel direction of the vehicle can be more easily and reliably acquired on the road side.

  The vehicle-mounted device of the present invention includes the vehicle history information that is travel direction information of the vehicle. According to the present invention, the travel history information can be easily generated in the vehicle, and it is not necessary to provide a special device on the road side in order to acquire the travel history information.

  The vehicle-mounted device of the present invention includes one in which the traveling direction information is obtained from GPS information indicating the traveling position of the vehicle. According to the present invention, a GPS device included in a navigation device mounted on a vehicle can be used, and a special device for acquiring special travel history information is not necessary on the vehicle side.

  The roadside device of the present invention is installed on the roadside and communicates with the vehicle-mounted device mounted on the vehicle, and is a passing situation indicating the correspondence between the travel history information and the travel route and travel direction of the vehicle. The determination information storage unit that stores the determination information, the traveling history information of the vehicle on which the vehicle-mounted device is mounted received from the vehicle-mounted device, and the passage situation determination information stored in the determination information storage unit are collated, And a passage state determination unit that determines a travel route and a travel direction of the vehicle.

  ADVANTAGE OF THE INVENTION According to this invention, the system which can acquire easily the information which shows the traveling route and traveling direction of the vehicle by which the vehicle equipment of a communicating party is mounted can be comprised simply by the road side.

  In the roadside apparatus of the present invention, the travel history information includes the vehicle passing point information. According to the present invention, it is possible to easily acquire travel history information used to acquire information indicating a travel route and a travel direction.

  In the roadside device of the present invention, the passing point information includes identification information given to each of the roadside devices received by the vehicle-mounted device when communicating with the roadside device. According to the present invention, since the passing point information is acquired at the same time when the road-vehicle communication is performed, the acquisition of the travel history information is further simplified.

  In the roadside device of the present invention, the passing point information includes road link information acquired by the vehicle. By using the road link information acquired by the vehicle-mounted device, information indicating the travel route and travel direction of the vehicle can be more easily and reliably acquired on the road side.

  In the roadside apparatus of the present invention, the travel history information includes the travel direction information of the vehicle. According to the present invention, the travel history information can be easily generated in the vehicle, and it is not necessary to provide a special device on the road side in order to acquire the travel history information.

  According to the present invention, a road-to-vehicle communication system, a road-to-vehicle communication method, and a road-to-vehicle communication method capable of easily and surely obtaining information indicating a travel route and a travel direction of a vehicle on which an onboard device as a communication partner is mounted, and An in-vehicle device and a roadside device that can be used for such road-to-vehicle communication can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram schematically illustrating an example of a relationship between a roadside device installed on a road and a traveling vehicle. FIG. 1 shows a situation in the vicinity of an interchange on a highway. A vehicle P travels on the main line up R1 and a vehicle Q travels on the main road down R2. A plurality of roadside devices 2 (1003, 1004, 2005) are arranged on the roadside of the expressway. The distance between the roadside devices 2 is appropriately set. The roadside device 2 is capable of road-to-vehicle communication with the traveling vehicles R, Q, etc., and the communicable range is set to a range in which communication with at least the vehicle traveling on the main line up R1 and main line down R2 is possible. By covering all adjacent roads within the communicable range, effective road-to-vehicle communication can be performed with a small number of roadside devices. For example, when a side road is provided in parallel with a highway, the range of communication can be extended to the side road, and road-to-vehicle communication can be performed with a vehicle traveling on the highway and the side road with a common roadside device. Become.

  FIG. 2 shows a schematic configuration of the road-to-vehicle communication system according to the first embodiment of the present invention. The system of FIG. 2 performs road-vehicle communication by DRSC between the vehicle-mounted device 1 mounted on a vehicle and the roadside device 2 installed on the road side.

  The vehicle-mounted device 1 includes a wireless communication unit 11, a control unit 12, a storage unit 13, an IC card interface unit (IC card I / F unit) 14, and a human interface unit (human I / F unit) 15. The wireless communication unit 11 performs DRSC wireless communication via an antenna (not shown). The control unit 12 controls the entire vehicle-mounted device, and is mainly composed of a processor that operates according to a predetermined program. The memory | storage part 13 memorize | stores the various intrinsic | native data containing ID information of onboard equipment, the driving | running history information of the vehicle mentioned later, the program containing various application programs, etc.

  The IC card I / F unit 14 reads and writes data from the IC card 10. The IC card 10 may be a contact type or a non-contact type, and is, for example, a credit card in which information such as a user ID is recorded. The IC card 10 is used for settlement of various services using road-to-vehicle communication by an in-vehicle device. The human I / F unit 15 includes an operation unit such as various switches operated by a user of the vehicle-mounted device, a display unit that performs display output for the user, a speaker that performs audio output, and the like.

  The vehicle-mounted device 1 controls the wireless communication unit 11 according to the program stored in the storage unit 13 to perform wireless communication by DRSC with the roadside device, and performs processing according to the stored application. In this example, the process of acquiring the travel history information of the vehicle, the process of storing the acquired travel history information in the storage unit 13, and the travel history information stored in the storage unit 13 during the communication with the road side device 2 are used. At least a program for performing processing to be transmitted to the computer is installed.

  The roadside device 2 includes a wireless communication unit 21, a control unit 22, a storage unit 33, and a network interface unit (network I / F unit) 24. The wireless communication unit 21 performs DRSC wireless communication via an antenna (not shown). The control unit 22 controls the entire roadside device 2 and is mainly configured by a processor that operates according to a predetermined program. The storage unit 23 stores various unique data of the roadside device, passage status determination information indicating correspondence between travel history information, which will be described later, and the travel route and travel direction of the vehicle, programs including various application programs, and the like. The network I / F unit 24 exchanges information with the central device 4 via the network 3.

  The roadside device 2 controls the wireless communication unit 21 according to the program stored in the storage unit 23 to perform wireless communication by DRSC with the vehicle-mounted device 1 and performs processing according to the stored application. In this example, the traveling history information received from the vehicle-mounted device 1 is checked against the passage status determination information stored in the storage unit 23 to determine the traveling route and the traveling direction of the vehicle on which the vehicle-mounted device 1 is mounted. At least a program for processing is installed.

  The roadside device 2 is connected to the central device 4 via the network 3. The central device 4 acquires probe information using road-to-vehicle communication and performs various service processes, and is realized by, for example, a server computer. In this example, information indicating the travel route and travel direction of the vehicle determined by the road device 2 is received from the road device 2, and the amount of vehicle traffic for each route and travel direction is measured.

  Next, vehicle travel history information acquired by the vehicle-mounted device 1 will be described. The travel history information is, for example, vehicle passing point information. As the passing point information, identification information given to each roadside device 2 can be used. When using the identification information of the roadside device 2, the vehicle-mounted device 1 receives the identification information of the communication-side roadside device 2 and stores a certain number as passing point information when communicating with the roadside device 2. The number to be stored is arbitrary as long as the travel route and the travel direction can be uniquely determined.

  FIG. 3 shows an example of passing point information stored in the storage unit 13 of the vehicle-mounted device 1. The passing point information shown in FIG. 3 (a) indicates the travel history of the vehicle P traveling at the position shown in FIG. 1, and the passing point information shown in FIG. 3 (b) indicates the position shown in FIG. The traveling history of the vehicle P that is traveling is shown. In FIG. 3, passing point 1 to passing point 5 are identification information of the roadside device 2 that has performed road-to-vehicle communication, and in the order of passing point 5, passing point 4, passing point 3, passing point 2, and passing point 1 The identification information of the roadside apparatus 2 which performed inter-vehicle communication is shown. “# 1003” and “# 2005” indicate identification information of the roadside device 1003 and the roadside device 2005, respectively. Similarly, “# 1002”, “# 1001”, “# 2005”, etc. are identification information of roadside devices 1002, 1001, 2006, etc. (not shown). The identification information stored as the passing points 1 to 5 is updated when the road-vehicle communication with the new roadside device 2 is performed, and the old ones are sequentially discarded. For example, when the vehicle P in FIG. 1 communicates with the roadside device 1004, the identification information “# 1004” of the roadside device 1004 is stored as the passing point 1, “# 1003” and the like are sequentially shifted, and “# 999” Discarded.

  Next, the passage state determination information used for determining the travel route and the travel direction of the vehicle on which the roadside device 2 performs the road-to-vehicle communication will be described. As is clear from the description of the passing point information, the passing point information of the vehicle that is communicating differs depending on the traveling route and the traveling direction of the vehicle. The route and the traveling direction can be determined. For example, the roadside device 1004 in FIG. 1 determines a travel route and a travel direction using the passage state determination information shown in FIG.

  The vehicles that can communicate with the roadside device 1004 in FIG. 1 are limited to vehicles that travel on the main line up R1 and vehicles that travel on the main line down R2, so it is sufficient to distinguish them. Since the vehicle traveling on the main line up R1 is limited to the vehicle from the point A, the vehicle should communicate with the roadside device 1003 and store “# 1003” as the latest passing point information. Further, since the vehicles traveling on the main line descending R2 are limited to the vehicles from the point C and the approaching vehicles from the point B, the vehicles are “# 2005” or “# 3101 (entry not shown) as the latest passing point information. The identification information of the roadside device provided on the road B) ”is supposed to be stored. Therefore, the roadside device 1004 in FIG. 1 can determine the travel route and the travel direction of the traveling vehicle by storing the passage state determination information as shown in FIG. 4 in the storage unit 23. When the roadside device 2 is not installed on the approach path B, it is determined that the vehicle travels on the main line descending R2 entered from the approach path B in the case of identification information other than “# 1003” and “# 2005”. You may do it.

  In the case of the roadside device 1004 in FIG. 1, any identification information of the passing points 2 to 5 does not affect the determination, so the passing status determination information in FIG. 4 is “d'ont care”. When there is a side road on the highway or there is a road that intersects in the vicinity of the installation point of the roadside device 2, it becomes passage state determination information using a lot of passage point information. In the storage unit 23 of the roadside device 2, passage status determination information is stored in advance. Since the passage state determination information needs to be changed according to the road situation and the roadside device installation situation, it is preferable that the passage state judgment information can be set from the central device 4.

  The operation of the road-to-vehicle communication system described above will be described with reference to the flowchart of FIG. 5 with a focus on acquisition and transmission of passing point information and determination of the passing state.

  The vehicle-mounted device 1 mounted on the vehicle determines whether or not the power is turned off (step S101), performs a frequency selection process while the power is on (step S102), and the frequency is between the roadside device 2 and the vehicle. Repeat until it is confirmed (step S103). When the vehicle approaches the roadside device 2 installed in the vicinity of the road, synchronization is established with the roadside device 2 and the frequency is determined, so communication connection processing is performed with the roadside device 2 (step S104).

  The roadside device 2 determines whether or not the power is turned off (step S201), and performs communication connection processing while the power is on (step S202). Since the communication connection process between the vehicle-mounted device 1 and the roadside apparatus 2 is the same as the process in the ETC system or the like, detailed description thereof is omitted.

  When communication connection processing is performed and various types of information can be communicated between the vehicle-mounted device 1 and the roadside device 2, the vehicle-mounted device 1 performs processing for transmitting passing point information to the roadside device 2 (step S105). When the vehicle P is traveling at the position shown in FIG. 1, the vehicle-mounted device 1 of the vehicle P stores the passing point information shown in FIG. 3A in the storage unit 13, and therefore reads the stored passing point information. To the roadside device 2 (1004). Further, when the vehicle Q is traveling in the position shown in FIG. 1, the vehicle-mounted device 1 of the vehicle Q stores the passing point information shown in FIG. Is transmitted to the roadside device 2 (1004).

  The roadside device 2 performs a passing point information reception process, receives the passing point information from the vehicle-mounted device 1 (step S203), and performs a passing state determination process (step S204). The passing situation determination process is performed by comparing the received passing point information with the passing situation determination information stored in the storage unit 23 to determine the traveling route and the traveling direction of the traveling vehicle. When the roadside device 2 (1004) of FIG. 1 receives the passing point information shown in FIG. 3A from the vehicle-mounted device 1 of the vehicle P, the passing point 1 of the received passing point information is “# 1003”. It is determined that the vehicle P is traveling on the main line. Similarly, when the passing point information shown in FIG. 3B is received from the vehicle Q, since the passing point 1 of the received passing point information is “# 2005”, the vehicle Q goes down the main line via the C point. Is determined to be running.

  When the passing state determination process is completed, the roadside device 2 transmits the identification information (ID) of the own device to the vehicle-mounted device 1 (step S205).

  After transmitting the passing point information, the vehicle-mounted device 1 waits for the identification information from the roadside device 2 to be transmitted, and when receiving the identification information (step S106), performs the communication disconnection process (step S107). And a passing point information update process is performed and passing point information is updated (step S108). For example, the vehicle-mounted device 1 of the vehicle P that has communicated with the roadside device 2 (1004) at the position shown in FIG. 1 receives the identification information (# 1004) from the roadside device 2 (1004) and displays the passing point information. Update to the one shown in 6. Note that the order of the communication disconnection process in step S107 and the passing point information update process in step S108 is not limited to the order shown in FIG. 5, and the passing point information update process may be first.

  After performing the roadside apparatus ID transmission process in step S205, the roadside apparatus 2 performs a communication disconnection process (step S206), and transmits the vehicle passing state obtained in step S205 to the central apparatus 4 via the network 3. (Step S207). As the passing situation, for example, the passing time of the vehicle, the traveling route, and the traveling direction are transmitted. The central device 4 that has received these passing conditions is used for measuring the amount of vehicle traffic for each route and traveling direction. When the vehicle type information of the vehicle on which the vehicle-mounted device 1 is mounted is included, the vehicle traffic for each vehicle type can be measured by transmitting the vehicle type information to the central device 4 together. Note that the order of the communication disconnection process in step S206 and the passage state transmission process in step S207 is not limited to the order shown in FIG. 5, and the passage state transmission process may be first.

  In the system of FIG. 2, the passage state determination process is performed by the roadside device 2, but may be performed by the central device 4. In this case, the passage state determination information corresponding to each roadside device 2 is stored in the central device 4, and the roadside device 2 transmits the passing point information received from the vehicle-mounted device 1 to the central device 4. In this case, a part of the functions of the roadside device 2 and the central device 4 are combined to constitute a broad roadside device.

  According to the road-to-vehicle communication system as described above, it is possible to accurately determine the travel route and the travel direction of the vehicle on which the vehicle-mounted device is mounted, and it is possible to accurately collect information on the travel vehicle. Further, by using not only the passing point information essential for determination of the traveling route and the traveling direction but also other passing point information received from the vehicle-mounted device, it is possible to obtain a more detailed vehicle passing situation. For example, in the example of FIG. 1, when an approach path is provided in front of the installation point of the roadside device 1003 and a roadside device is installed on the approach road, by using the information of the passing point 2, It is possible to distinguish a vehicle that has entered and a vehicle that has traveled on the main line R1 from before.

  In the above example, the passing point information using the identification information of the roadside device that performed the roadside communication is used as the travel history information of the vehicle, but the road link information acquired by the vehicle may be used as the passing point information. As the road link information, VICS link information that can be acquired by the navigation device can be used. Moreover, you may use the driving | running | working direction information of a vehicle as driving history information. The traveling direction information of the vehicle can be acquired based on the longitude and latitude information of the vehicle acquired by the navigation device, for example.

  When using road link information and traveling direction information, an in-vehicle device 1 is provided with an interface unit (not shown) for exchanging data with the navigation device. Then, road link information or longitude / latitude information (GPS information) indicating the vehicle travel position is taken from the navigation device. Since the mechanism by which the navigation device acquires road link information and the mechanism to acquire longitude and latitude information are well known, description thereof will be omitted.

  FIG. 7 shows an operation flow of the vehicle-mounted device when road link information is used as passing point information. In this case, the vehicle 1 is equipped with a navigation device (not shown) compatible with the VICS system, and the vehicle-mounted device 1 is connected to the mounted navigation device so as to be able to exchange data.

  The vehicle-mounted device 1 mounted on the vehicle determines whether or not the power is turned off (step S701), and when the power is on, acquires VICS link information that is an example of road link information (step S702). The VICS link information is acquired from the navigation device that is acquired and held by the navigation device mounted on the vehicle at an appropriate interval. Then, the passing point information stored in the storage unit 13 is updated (step S703). When using VICS link information as passing point information, the latest VICS link information may be stored, but when obtaining detailed vehicle passing conditions, a plurality of VICS lick information is stored as passing point history. deep.

  Next, frequency selection processing is performed (step S704), and the above processing is repeated until the frequency is determined with the roadside device 2 (step S705). When the vehicle approaches the roadside device 2 installed in the vicinity of the road, synchronization is established with the roadside device 2 and the frequency is determined, so communication connection processing is performed with the roadside device 2 (step S706).

  When communication connection processing is performed and various types of information can be communicated between the vehicle-mounted device 1 and the roadside device 2, the vehicle-mounted device 1 stores the VICS link information stored in the storage unit 13 as passing point information in the roadside device 2. A passing point information transmission process for transmission is performed (step S707). When the transmission of the VICS information ends, a communication disconnection process is performed (step S708).

  In this case, the roadside device 2 stores the information indicating the correspondence between the VICS link information and the travel route and the travel direction of the vehicle as the passage status determination information. The travel route and the travel direction are determined. The operation of the roadside apparatus 2 is the same as the process of FIG. 5 except that the passage state determination process is different and the roadside apparatus ID transmission process is unnecessary, and thus the description thereof is omitted.

  FIG. 8 shows an operation flow of the vehicle-mounted device when the traveling direction information of the vehicle is used as the traveling history information. In this case, the vehicle 1 is equipped with a navigation device (not shown) having a GPS device, and the vehicle-mounted device 1 is connected to the mounted navigation device so as to be able to exchange data.

  The vehicle-mounted device 1 mounted on the vehicle determines whether or not the power is turned off (step S801), and if the power is on, acquires GPS information (longitude and latitude information) (step S802). The GPS information is acquired from the navigation device that is acquired and held by the navigation device mounted on the vehicle at appropriate intervals. And the driving | running | working direction of a vehicle is calculated using several GPS information acquired continuously (step S803). When calculating the latest traveling direction easily, the GPS information of the latest two points is used. Then, the calculated traveling direction information is updated, and the traveling direction information stored in the storage unit 13 is updated (step S804). When using traveling direction information, it is sufficient to store the latest traveling direction information, but it is also possible to store a plurality of traveling direction information in consideration of GPS information and calculation errors.

  Next, frequency selection processing is performed (step S805), and the above processing is repeated until the frequency is determined with the roadside device 2 (step S806). When the vehicle approaches the roadside device 2 installed in the vicinity of the road, synchronization is established with the roadside device 2 and the frequency is determined, so communication connection processing is performed with the roadside device 2 (step S807).

  When communication connection processing is performed and various types of information can be communicated between the vehicle-mounted device 1 and the roadside device 2, the vehicle-mounted device 1 stores the traveling direction information stored in the storage unit 13 as the travel history information in the roadside device 2. A traveling direction information transmission process to be transmitted is performed (step S808). Then, when the transmission of the travel direction information is completed, a communication disconnection process is performed (step S809).

  In this case, since the roadside device 2 stores information indicating the correspondence between the travel direction information and the travel route and the travel direction of the vehicle as the passage state determination information, the traveling vehicle uses the stored passage state determination information. The travel route and the travel direction are determined. The operation of the roadside apparatus 2 is the same as the process of FIG. 5 except that the passage state determination process is different and the roadside apparatus ID transmission process is unnecessary, and thus the description thereof is omitted.

  The road-to-vehicle communication system, the road-to-vehicle communication method, the vehicle-mounted device, and the road-side device of the present invention easily and reliably acquire information indicating the travel route and travel direction of the vehicle on which the vehicle-mounted device of the communication partner is mounted. It is useful as a road-to-vehicle communication system, a road-to-vehicle communication method, a vehicle-mounted device, a roadside device, and the like.

The figure which shows typically an example of the relationship between the roadside apparatus installed in the road, and a traveling vehicle The figure which shows schematic structure of the road-vehicle communication system of embodiment of this invention. The figure which shows an example of the passing point information memorize | stored in the memory | storage part of the onboard equipment of embodiment of this invention. The figure which shows an example of the passage condition determination information memorize | stored in the memory | storage part of the roadside apparatus of embodiment of this invention. The figure which shows schematic operation | movement flow of the road-to-vehicle communication system of embodiment of this invention. The figure which shows an example of the passing point information updated of the onboard equipment of embodiment of this invention The figure which shows schematic operation | movement flow in the case of utilizing the road link information of the onboard equipment of embodiment of this invention. The figure which shows the general | schematic operation | movement flow in the case of utilizing the driving | running | working direction information of the onboard equipment of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Onboard equipment 2 Roadside apparatus 3 Network 4 Central apparatus 10 IC card 11, 21 Wireless communication part 12, 22 Control part 13, 23 Memory | storage part 14 IC card interface part 15 Human interface part 24 Network interface part

Claims (18)

In a road-to-vehicle communication system that performs communication between an in-vehicle device mounted on a vehicle and a roadside device installed on the road side,
The vehicle-mounted device includes a travel history acquisition unit that acquires travel history information of a vehicle on which the vehicle-mounted device is mounted, a travel history storage unit that stores the acquired travel history information, and the roadside device during communication with the roadside device. A communication control unit that transmits the travel history information stored in the travel history storage unit to the roadside device;
The roadside device includes a determination information storage unit that stores passage state determination information indicating correspondence between the travel history information and the travel route and direction of the vehicle, and the travel history information received from the vehicle-mounted device and the determination information storage unit. The passage condition determination unit that compares the stored passage condition determination information and determines the traveling route and traveling direction of the vehicle on which the vehicle-mounted device is mounted ,
If there is the latest passing point information, determine the traveling route and traveling direction of the traveling vehicle from the information,
A road-to-vehicle communication system , characterized in that when there is no latest passing point information, it is determined that the vehicle has entered from an approach road .
  The road-vehicle communication system according to claim 1, wherein the travel history information is passing point information of the vehicle. The passing point information is identification information given to each of the roadside devices,
The road-to-vehicle communication system according to claim 2, wherein the vehicle-mounted device receives identification information of the roadside device and stores it as passing point information when communicating with the roadside device.   The road-vehicle communication system according to claim 1, wherein the passing point information is road link information acquired by the vehicle.   The road-vehicle communication system according to claim 1, wherein the travel history information is travel direction information of the vehicle.   The road-to-vehicle communication system according to claim 5, wherein the travel direction information is obtained from GPS information indicating a travel position of the vehicle. In the road-to-vehicle communication method for performing communication between the vehicle-mounted device mounted on the vehicle and the roadside device installed on the road side,
In the in-vehicle device, a travel history storing step of acquiring and storing travel history information of a vehicle in which the on-vehicle device is mounted;
A travel history transmission step for transmitting the travel history information stored in the travel history storage step from the vehicle-mounted device to a roadside device;
The travel history information from the on-vehicle device received by the roadside device is collated with passage condition determination information indicating correspondence between the travel history information, the travel route, and the travel direction, and the travel route of the vehicle on which the on-vehicle device is mounted And a passing situation determination step for determining a traveling direction ,
If there is the latest passing point information, determine the traveling route and traveling direction of the traveling vehicle from the information,
A road-to-vehicle communication method characterized by determining that the vehicle has entered from an approach road when there is no latest passing point information . In the vehicle-mounted device that is mounted on the vehicle and communicates with the roadside device installed on the road side,
A travel history acquisition unit that acquires travel history information of the vehicle;
A travel history storage unit for storing the acquired travel history information;
A vehicle-mounted device comprising: a communication control unit that transmits travel history information stored in the travel history storage unit to the roadside device during communication with the roadside device.   The on-vehicle device according to claim 8, wherein the travel history information is passing point information of the vehicle. The passing point information is identification information given to each of the roadside devices,
The vehicle-mounted device according to claim 9, wherein identification information of the roadside device is received and stored as passing point information during communication with the roadside device.   The on-vehicle device according to claim 8, wherein the passing point information is road link information acquired by the vehicle.   The on-vehicle device according to claim 8, wherein the travel history information is travel direction information of the vehicle.   The in-vehicle device according to claim 12, wherein the traveling direction information is obtained from GPS information indicating a traveling position of the vehicle. In the roadside device that is installed on the roadside and communicates with the vehicle-mounted device mounted on the vehicle,
A determination information storage unit that stores passage state determination information indicating correspondence between the travel history information and the travel route and travel direction of the vehicle;
The travel history information of the vehicle in which the vehicle-mounted device is mounted, which is received from the vehicle-mounted device, is compared with the passage status determination information stored in the determination information storage unit, and the travel route and the travel direction of the vehicle are determined. A roadside device comprising a passage state determination unit.   The roadside device according to claim 14, wherein the travel history information is passing point information of the vehicle.   The roadside device according to claim 15, wherein the passing point information is identification information given to each of the roadside devices received by the vehicle-mounted device during communication with the roadside device.   The roadside device according to claim 14, wherein the passing point information is road link information acquired by the vehicle.   The roadside device according to claim 14, wherein the travel history information is travel direction information of the vehicle.

Images