JP2012105082A - Communication device and data communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to adequately transmit data received by wireless communication from the outside of a vehicle to an on-vehicle apparatus through an in-vehicle network.SOLUTION: A data frame containing net data, a data identifier, and a CANID that are information provided by an ECU of a transmission source is transmitted by an in-vehicle network of a transmission side vehicle. A communication ECU 1 transmits a data frame for wireless communication containing a pair composed of the net data in the received data frame and its data identifier and identification number of the vehicle to a reception side vehicle. A communication ECU 2 in the reception side vehicle specifies an individual CANID corresponding to the net data, based on the identification number of the vehicle and the data identifier attached to the net data contained in the data frame received from the transmission side vehicle. A CANID definition database stored in a storage part is referenced in specifying the CANID; and a data frame generated by adding the specified CANID to the net data is transmitted to a communication bus 300.

Description

  The present invention relates to a technique for transmitting data received from outside a vehicle by wireless communication to an in-vehicle device through an in-vehicle network such as CAN (Controller Area Network).

  2. Description of the Related Art Conventionally, a technique for forming a platoon with a plurality of automobiles and traveling together as a group of vehicles is known (for example, see Patent Document 1). In such a technique, traveling control information is transmitted between the vehicles in the vehicle group, so that the vehicle group performs a predetermined formation.

  In order to control the platooning with high accuracy, it is important to transmit information between vehicles without delay and to control the vehicles in real time. From this point of view, as in the virtual inter-vehicle communication network shown in FIG. 8A, the ECU (Electronic Control Unit) of each vehicle is physically connected by a communication line for wired communication. Therefore, it is conceivable to integrate the in-vehicle network among a plurality of vehicles and share information in real time with all the vehicles to perform cooperative control of the vehicle group.

  However, it is not realistic to physically connect running vehicles with a communication line. In practice, information is shared between vehicles using wireless communication as shown in FIG. 8B. Means are needed.

  By the way, CAN is widely spread as a communication technology for an in-vehicle network used for sharing information among a plurality of ECUs mounted on a vehicle (see, for example, Patent Document 2). The CAN employs a multi-master system in which a plurality of ECUs constitute a bus-type network in which a set of communication buses are shared, and priority is not set for each ECU. An ID for identifying the data is given to the data frame sent from the ECU to the communication bus. Each ECU discriminates data to be received based on the ID of the data frame sent to the communication bus.

Japanese Patent No. 3602959 JP 2008-49976 A

  When information transmitted by a communication method for identifying information content by ID like the above-mentioned CAN is shared among a plurality of vehicles by transmitting to other vehicles by wireless communication, the following problems can be cited. .

  As shown in FIG. 8C, the data frame transmitted from the ECU 100 of the transmitting vehicle is composed of net data indicating the information content provided by the ECU 100 and an ID for identifying the net data. This ID is determined on the basis of a predetermined standard so that each ECU can correctly determine the data contents in the in-vehicle network of the own vehicle or can specify the transmission source ECU. It is unique depending on the manufacturer and model of the vehicle. The wireless device 3 of the transmitting vehicle generates a data frame for wireless communication using the data frame as a payload from the ECU 100 connected via the communication bus, and transmits this to the outside of the vehicle.

  When receiving the wireless communication data frame transmitted from the transmission side vehicle, the wireless device 4 of the reception side vehicle sends out a data frame including the ID and net data as the payload to the in-vehicle network side of the own vehicle. However, the ID of this data frame is uniquely assigned in the transmission-side vehicle, and there is a possibility that it does not conform to a standard that is predetermined within the in-vehicle network of the reception-side vehicle. In such a case, the ECU 200 connected to the in-vehicle network of the receiving vehicle cannot correctly determine the contents of the data frame, or the ID overlaps with the data frame transmitted from another ECU 200. There is a risk of misrecognizing the contents of the data.

  Such problems are not limited to vehicle-to-vehicle communication performed between vehicles, but in the case of road-to-vehicle communication in which a vehicle traveling on a road receives information related to vehicle control from a communication device for providing information installed on the roadside. Can happen as well.

  The present invention has been made to solve the above problem, and an object of the present invention is to provide a technique for appropriately transmitting data received from outside the vehicle by wireless communication to an in-vehicle device through an in-vehicle network. To do.

  In order to achieve the above object, the invention according to claim 1 is provided in an in-vehicle network in which a plurality of in-vehicle devices are interconnected with transfer data based on external data mounted on a vehicle and received from outside by wireless communication. The present invention relates to a communication device that transmits to a communication bus. The external data received by this communication device includes net data used for control of the in-vehicle device and transmission source identification information unique to the transmission source.

  The storage means included in the communication apparatus of the present invention stores definition information in which an in-vehicle network ID that can be discriminated by an in-vehicle device in the in-vehicle network, corresponding to each transmission source identification information. The generating means refers to the definition information stored in the storage means, specifies the in-vehicle network ID corresponding to the transmission source identification information included in the external data received from the outside, and uses the specified in-vehicle network ID. Transfer data added to the net data included in the external data is generated. The sending unit sends the transfer data generated by the generating unit to the communication bus.

  According to the present invention configured as described above, a unique ID suitable for the in-vehicle network of the host vehicle is assigned to the data received from the outside by wireless communication, and then the data is transmitted to the in-vehicle network. be able to. In other words, in the ID definition information, by assigning a unique ID for each transmission source so that erroneous recognition of data and duplication of IDs do not occur within the in-vehicle network of the own vehicle, data received from outside the vehicle by wireless communication can be obtained. It can be transmitted to in-vehicle devices appropriately through the in-vehicle network.

  Next, the communication apparatus according to claim 2 has the following characteristics. That is, the external data received by the communication device further includes a data identifier for identifying net data. The definition information stored in the storage means defines a plurality of in-vehicle network IDs corresponding to a plurality of data identifiers for one piece of transmission source identification information. Then, the generation means refers to the definition information, specifies the in-vehicle network ID corresponding to both the transmission source identification information included in the external data and the data identifier related to the net data, and uses the specified in-vehicle network ID. Transfer data added to the net data is generated.

  By configuring in this way, it is possible to give IDs that are subdivided according to the content and use of net data as well as the transmission source to external data, and diversify how to use the data in the in-vehicle network it can.

  By the way, it is conceivable that the communication device of the present invention is configured to receive external data through inter-vehicle communication with a transmission-side communication device mounted on another vehicle, as described in claim 3. With this configuration, the data used in the in-vehicle network in the data transmission source vehicle can be appropriately used in the in-vehicle network of the receiving vehicle.

  Or you may comprise the communication apparatus of this invention as what receives external data by the road-to-vehicle communication with the transmission side communication apparatus installed in the roadside as described in Claim 4. With this configuration, the data supplied from the transmission side communication device that is the data transmission source can be appropriately used also in the in-vehicle network of the reception side vehicle.

  Next, the communication apparatus according to claim 5 has the following characteristics. That is, the in-vehicle network to which the communication apparatus of the present invention is connected is constructed in accordance with the CAN (Controller Area Network) standard, and the in-vehicle network ID is an ID for a frame that is a communication unit of CAN. The generating means included in the communication device of the present invention generates a data frame in which the frame ID specified based on the definition information is added to the net data included in the external data. The sending means sends the data frame generated by the generating means to the CAN communication bus.

  By doing in this way, after giving unique ID (CANID) suitable for CAN of the own vehicle to the data received from the outside by wireless communication, this data can be sent in CAN. In other words, in the CANID definition information, by assigning a unique CANID to each transmission source so that erroneous recognition of data or duplication of CANID does not occur within the CAN of the host vehicle, data received from outside the vehicle by wireless communication can be transferred. Can be sent to the in-vehicle device appropriately.

  Next, a data communication system according to claims 6 to 10 includes the communication device of the present invention and a transmission-side communication device that transmits external data to the communication device by wireless communication. According to the data communication system configured as described above, the same effects as those of the communication device according to claims 1 to 5 can be obtained.

The block diagram which shows schematic structure of the data communication system of embodiment. Explanatory drawing which shows the outline | summary of the data communication between a transmission side vehicle and a receiving side vehicle. Explanatory drawing which shows the CANID definition data database and the example of a conversion. The flowchart of the process which communication ECU1 by the side of transmission performs. The flowchart of the process which communication ECU2 by the side of reception performs. Explanatory drawing which shows embodiment by vehicle-to-vehicle communication. Explanatory drawing which shows embodiment by road-to-vehicle communication. The figure for demonstrating the problem of a prior art.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following embodiment at all, and can be implemented in various aspects.
[Description of configuration]
FIG. 1 is a block diagram illustrating a schematic configuration of a data communication system according to an embodiment. As shown in FIG. 1, a data communication system is mounted on a transmission-side vehicle and connected to a communication ECU (transmission side) 1 that is communicably connected to a group of ECUs 100 in the vehicle via a communication bus 300, and to a reception-side vehicle. A communication ECU (reception side) 2 that is mounted and is communicably connected to a group of ECUs 200 in the vehicle via a communication bus 300. Although FIG. 1 shows one vehicle each equipped with a communication ECU (transmission side) 1 and one vehicle equipped with a communication ECU (reception side) 2, a plurality of vehicles may be provided.

  The communication ECU (transmission side) 1 includes a control unit 10 and a storage unit 11 for a reception CANID list. The control unit 10 is configured around a known computer device including a CPU, a ROM, a RAM, an I / O, a wireless communication device (not shown), and the like, and receives information received from each ECU 100 via the communication bus 300. It has a function of transmitting a data frame of a predetermined format based on it to the receiving vehicle by wireless communication. Note that the control unit 10 and each ECU 100 have a known function of performing communication as a CAN standardized in ISO11898-1.

  The storage unit 11 is a storage device for storing the received CANID list, and is configured by, for example, a nonvolatile memory. The reception CANID list stored in the storage unit 11 defines the IDs of data frames that the communication ECU 1 should acquire among the CAN data frames flowing on the communication bus 300.

  Each ECU 100 group is configured around a well-known computer device including a CPU, a ROM, a RAM, an I / O, and the like (not shown). The vehicle is controlled by executing vehicle control software stored in a memory such as a ROM. Control each part of the device. The ECU 100 transmits and receives data to and from other ECUs via the communication bus 300, and uses CAN as a communication protocol at this time. The ECU 100 may perform vehicle control in cooperation with other ECUs by transmitting / receiving data to / from other ECUs via the communication bus 300, and can directly input detection signals of various sensors and independently. Vehicle control may be implemented. The ECU 100 includes an engine, an accelerator, a brake, various sensors, and a device for controlling various parts and devices of the vehicle such as an in-vehicle camera.

  The communication ECU (reception side) 2 includes a control unit 20 and a storage unit 21 for a CANID definition database. The control unit 20 is configured around a known computer device including a CPU, a ROM, a RAM, an I / O, a wireless communicator, and the like (not shown), and is based on data received from the transmitting vehicle by wireless communication. The function of sending a data frame with a predetermined CANID to the communication bus 300 is assumed. The control unit 20 and each ECU 200 have a known function of performing communication as a CAN standardized in ISO11898-1.

  The memory | storage part 21 is a memory | storage device for memorize | storing a CANID definition database, for example, is comprised by a non-volatile memory etc. The CANID definition database stored in the storage unit 21 defines a CANID corresponding to transmission source identification information (an identification number for identifying a vehicle or a radio) attached to data received from a transmission-side vehicle. (Details will be described later). CANID here is identification information for identifying data contents and a transmission source in CAN communication. In CAN communication, the priority of data can be indicated by CANID.

  Each ECU 200 group is configured around a well-known computer device including a CPU, a ROM, a RAM, an I / O and the like (not shown), and the vehicle is controlled by executing vehicle control software stored in a memory such as a ROM. Control each part of the device. The ECU 200 transmits and receives data to and from other ECUs including the communication ECU (reception side) 2 via the communication bus 300, and uses CAN as a communication protocol at this time. ECU 200 cooperates with other ECUs by transmitting / receiving data to / from other ECUs via communication bus 300 or performs vehicle control based on external data received from communication ECU (reception side) 2. Further, the vehicle control may be performed independently by directly inputting detection signals of various sensors. The ECU 200 includes an engine, an accelerator, a brake, various sensors, and a device for controlling various parts and devices of the vehicle such as an in-vehicle camera.

  As a communication mode used for wireless communication performed between the communication ECU (transmission side) 1 of the transmission side vehicle and the communication ECU (reception side) 2 of the reception vehicle side, for example, an ETC (registered trademark) system or the like is used. It is conceivable to use a technique such as a radio beacon used in narrow-area communication (DSRC) or VICS (registered trademark) used. Alternatively, in Japan, it may be possible to use 700 MHz band radio waves whose usage categories are scheduled to be reorganized after the end of 2011 (planned) analog television broadcasting. Since the 700 MHz band radio wave has a longer wavelength than that of the 5.8 GHz band radio wave used in DSRC, diffraction tends to occur. Therefore, in an urban area where buildings are densely packed, communication can be performed even from the shadow of the building.

  By the way, the communication ECU mounted on each of the transmission side vehicle and the reception side vehicle is an integrated communication ECU having both the function of the communication ECU (transmission side) 1 and the function of the communication ECU (reception side) 2 on the reception vehicle side. Can also be implemented. According to such a communication ECU, one vehicle can be either a transmission-side vehicle or a reception-side vehicle, and bidirectional data communication is possible between vehicles.

[Explanation of operation overview]
Next, an outline of the operation in the data communication system of the present embodiment will be described. FIG. 2 is a diagram illustrating an outline of data communication performed between the transmission-side vehicle and the reception-side vehicle.

  In the in-vehicle network (CAN) of the transmitting vehicle, a data frame to be transmitted from each ECU 100 to another ECU is transmitted on the communication bus 300. In the example shown in FIG. 2, it is assumed that two data frames 1 and 2 are sequentially transmitted to the communication ECU (transmission side) 1 in the in-vehicle network of the transmission side vehicle. The data frames 1 and 2 are information for identifying the types and contents of the net data 1 and 2 in addition to the net data 1 and 2 that are the vehicle control information itself provided by the transmission source ECU 100. Data identifiers 1 and 2 and CANIDs (1) and (2) for identifying data frames in the in-vehicle network are included.

  When the communication ECU (transmission side) 1 acquires a data frame to be received through the communication bus 300, the communication ECU 1 transmits a pair including the net data excluding the CANID of each data frame and its data identifier, and an identification number of the own vehicle (vehicle Alternatively, a data frame for wireless communication is generated by using a batch of data including information indicating an identification number that can identify a wireless device as a payload and adding a communication header, which is additional information for wireless communication, to the payload. At this time, a plurality of pairs of net data and data identifiers may be included in the payload as necessary. Then, the communication ECU (transmission side) 1 transmits the generated data frame for wireless communication to the reception side vehicle.

  When the communication ECU (reception side) 2 of the reception side vehicle receives the data frame of the wireless communication sent from the transmission side vehicle, the identification number included in the payload and each of the net data 1 and 2 are attached. Based on the data identifiers 1 and 2, individual CANIDs (A) and (B) corresponding to the net data 1 and 2 are specified. For specifying the CANID, the CANID definition database stored in the storage unit 21 is referred to. Then, data frames A and B in which CANIDs (A) and (B) are assigned to the net data 1 and 2 are generated, and these data frames are sequentially transmitted to the communication bus 300. The sent data frame is received by the ECU 200 in the in-vehicle network corresponding to the CANID based on each CANID, and the net data is used for vehicle control.

[Explanation about CANID definition database]
FIG. 3A is a diagram illustrating an example of a CANID definition database stored in the storage unit 21 of the communication ECU (reception side) 2. As shown in FIG. 3 (a), the CANID definition database is assigned a list of vehicle identification numbers (identification numbers that can identify vehicles or radios) that are assumed as communication partners, and individual identification numbers. The range of CANIDs that are present is described. The CANID assigned to each identification number in this CANID definition database is determined by each ECU connected to the in-vehicle network of the own vehicle in consideration of the type and content of data that can be received from the vehicle corresponding to the identification number. This data is set in advance so that the contents of the data can be properly determined. In this CANID definition database, a plurality of CANIDs are assigned to one identification number corresponding to a plurality of data identifiers.

  FIG. 3B is a diagram illustrating an example of CANID conversion based on the identification number of the transmission-side vehicle and the data identifier attached to the net data in the transmission data. As shown in FIG. 3B, the control unit 20 of the communication ECU (reception side) 2 responds to the data identifier attached to the net data from the range of CANIDs assigned to each identification number in the CANID definition database. Thus, the CANID to be applied to the net data is uniquely determined.

[Description of processing procedure]
Next, a procedure of processing related to the present invention performed by the communication ECU (transmission side) 1 and the communication ECU (reception side) 2 will be described below.

  FIG. 4 is a flowchart illustrating a procedure of processing executed by the control unit 10 of the communication ECU (transmission side) 1 provided in the transmission-side vehicle. This process is a process executed at any time at a predetermined timing when data transmission is required to an external vehicle.

  First, the control unit 10 of the communication ECU (transmission side) 1 acquires a CANID related to a data frame that needs to be received from the in-vehicle network side from the reception CANID list stored in the storage unit 11 (S100). Next, based on the CANID acquired in S100 and the CANID attached to the data frame received from the in-vehicle network side, it is determined whether all the data frames that need to be received have been received (S101).

  If all the data frames that need to be received have not been received (S101: NO), the process returns to S101 and waits for data reception. On the other hand, when all the data frames that need to be received are received (S101: YES), a data frame for wireless communication is generated based on these data frames (S102).

  Specifically, a payload is a set of data including a pair consisting of net data excluding CANID from each data frame received from the in-vehicle network side and its data identifier, and information indicating the identification number of the own vehicle. A communication header that is additional information for wireless communication is added to generate a data frame for wireless communication. The identification number stored in the payload may be acquired from another ECU 100 via the communication bus 300, or may be stored in advance in the memory of the control unit 10. Next, in S103, the wireless communication data frame generated in S102 is wirelessly transmitted to the outside, and this process is terminated.

  FIG. 5 is a flowchart illustrating a procedure of processing executed by the control unit 20 of the communication ECU (reception side) 2 included in the reception-side vehicle. This process is a process executed when a wireless communication data frame is received from the transmitting vehicle.

  First, the control unit 20 of the communication ECU (reception side) 2 acquires the identification number of the transmission source and the data identifier attached to the net data from the payload of the data frame received by wireless communication (S200). Next, with reference to the CANID definition database (see FIG. 3) stored in the storage unit 21, the CANID corresponding to the combination of the identification number and the data identifier acquired in S200 is specified (S201). In addition, when the payload of the received data frame includes a plurality of pairs of net data and data identifiers, individual CANIDs corresponding to combinations of the respective data identifiers and identification numbers are specified.

  Next, a data frame for CAN communication is generated by adding the CANID specified in S201 to the corresponding net data (S202). Then, the generated data frames are sequentially sent to the communication bus 300 (S203), and this process is terminated.

[Specific operation example 1: Inter-vehicle communication]
Next, a specific operation example of the data communication system of the above embodiment will be described with reference to FIG.

  FIG. 6 shows an example in which inter-vehicle communication is performed between a large vehicle (such as a bus or a truck) that precedes the platoon and a subsequent small vehicle (such as a passenger car) that travels immediately after the large vehicle. As shown in FIG. 6, since the small vehicle follows immediately behind the preceding large vehicle, the following small vehicle is obstructed by the preceding large vehicle, and the road conditions and traffic lights ahead are visually recognized. It is difficult to do.

  Therefore, a data frame for wireless communication including imaging data from an in-vehicle camera that images the front view of the host vehicle is transmitted from the communication ECU (transmission side) 1 mounted on the preceding large vehicle to the subsequent vehicle. It is assumed that a transmission source identification number and a data identifier for identifying the imaging data are added to the data frame in addition to the imaging data.

  When the communication ECU (reception side) 2 mounted on the succeeding small vehicle receives a data frame of wireless communication from the preceding vehicle, the communication ECU 2 gives a CANID unique to the in-vehicle network of the own vehicle to the imaging data included in the data frame, This is sent to the in-vehicle network. The transmitted imaging data is received by, for example, a display device or an image processing device connected to the in-vehicle network, and is used for processing related to driving support or the like in these devices. Note that an ECU that uses imaging data acquired from the outside can appropriately determine data to be received based on a CANID attached to the imaging data.

  According to such a configuration, in a situation where the field of view of the following small vehicle is physically obstructed, the subsequent small vehicle can share this information about the road condition ahead of the vehicle detected by the preceding vehicle. Information can be used for driving support. Further, even if this small vehicle is not equipped with its own vehicle-mounted sensors (for example, a vehicle-mounted camera), there is an advantage that vehicle control can be performed by obtaining information equivalent to or wider than that of mounting a sensor. By using such advantages, the following operation is also possible.

  For example, when an expensive vehicle control system including a high-performance sensor and an ECU that controls the vehicle using information detected by the sensor is introduced into the vehicle, both the sensor and the ECU are installed in the vehicle due to cost and other reasons. It may be difficult to install. Even in such a case, as long as the communication ECU (reception side) 1 of the present embodiment is introduced into the vehicle network, only the ECU can be added to the vehicle network. In this case, the communication ECU (reception side) 1 of the own vehicle acquires the detection information of the sensor mounted on the other vehicle, and the own ECU performs vehicle control based on the acquired detection information.

  As described above, by relying on the outside (transmission side vehicle) for a part of the functions realized by sharing data among a plurality of ECUs in the in-vehicle network, such a high price that can be adopted only for some luxury cars. It is also possible to disseminate the functions of the vehicle control system relatively inexpensively to popular cars that emphasize economy.

  In addition, although the example shown in FIG. 6 transmitted the imaging data by a vehicle-mounted camera, it is only an example and it is with respect to various functions implement | achieved by transmitting / receiving data between several ECUs in a vehicle network. Thus, the configuration of this embodiment can be employed.

[Specific operation example 2: Road-to-vehicle communication]
Next, a specific operation example in a modification of the data communication system according to the embodiment will be described with reference to FIG.

  The above-described embodiment is a data communication system that employs a configuration in which data transmission is performed by inter-vehicle communication between a transmission-side vehicle and a reception-side vehicle. On the other hand, the structure which transmits data by the road-to-vehicle communication with the receiving vehicle from the roadside communication apparatus (roadside machine) installed in the roadside can also be adopted.

  FIG. 7 shows an example in which road-to-vehicle communication is performed between a roadside device (communication ECU (transmission side) 1b) attached to a traffic signal installed at an intersection and a vehicle traveling in the vicinity of the intersection. ing. Here, it is assumed that the vehicle is in a situation where the situation at the intersection cannot be directly visually recognized while traveling toward the intersection.

  Therefore, the communication ECU (transmission side) 1b associated with the traffic signal transmits a wireless communication data frame including imaging data from the roadside camera that images the traffic situation at the intersection to the surrounding vehicles. It is assumed that the roadside communication ECU (transmission side) 1b has the same information processing function and wireless communication function as the vehicle-mounted communication ECU (transmission side) 1 in the above embodiment. The data frame transmitted by the communication ECU (transmission side) 1b is added with identification information for identifying the transmission side roadside machine and a data identifier for identifying the imaging data in addition to the imaging data. It shall be.

  When the communication ECU (reception side) 2 mounted on the vehicle traveling around the intersection receives a wireless communication data frame from the roadside attached to the traffic signal, the in-vehicle network of the own vehicle is added to the imaging data included in the data frame. A unique CANID is assigned and sent to the in-vehicle network. The sent image data is received, for example, by an ECU such as a display device or an image processing device connected to the in-vehicle network, and is used for processing related to driving support or the like in the ECU. An ECU that uses imaging data acquired from the outside can appropriately determine data to be received based on CANID attached to the imaging data.

  According to such a configuration, in a situation where the traffic situation at the intersection in front of the vehicle's path cannot be directly visually recognized, the neighboring vehicle receives this information on the road situation detected at the intersection, and the neighboring vehicle receives this information. Can be used for driving assistance. Moreover, even if this surrounding vehicle is not provided with its own vehicle-mounted sensors (for example, a vehicle-mounted camera), there is an advantage that vehicle control can be performed by obtaining information equal to or wider than the sensor mounted.

[effect]
The data communication system according to the embodiment has the following effects.
(1) The communication ECU (reception side) 2 gives a unique CANID suitable for the in-vehicle network of the host vehicle to the data received from the external communication ECU (transmission side) 1 by wireless communication. Data can be sent into the in-vehicle network. For this purpose, each CANID ID database (for example, an identification number that can identify a vehicle or a radio) transmits a CANID so that erroneous recognition of data or duplication of CANID does not occur within the in-vehicle network of the host vehicle. Can be assigned. Thereby, the data received from outside the vehicle by wireless communication can be appropriately transmitted to each ECU in the in-vehicle network.

  (2) The data frame for wireless communication transmitted from the communication ECU (transmission side) 1 includes a data identifier for identifying net data. By using this, the communication ECU (reception side) 2 can add a CANID subdivided according to the contents and use of the net data to the data frame as well as the transmission source, and the data in the in-vehicle network. You can diversify how to use.

  (3) The data communication system according to the present invention performs inter-vehicle communication between a communication ECU (transmission side) 1 mounted on a transmission side vehicle and a communication ECU (reception side) 2 mounted on a reception side vehicle. Can be configured. As a result, the data used in the in-vehicle network in the data transmission source vehicle can be appropriately used in the in-vehicle network of the receiving vehicle. As a result, for example, based on the information acquired by one preceding vehicle with its own sensors, the subsequent vehicle also controls the vehicle at the same time as the preceding vehicle. Can be shared.

  (4) The data communication system according to the present invention is configured to perform road-to-vehicle communication by a roadside unit (communication ECU 1b) installed on the roadside and a communication ECU (reception side) 2 mounted on the receiving side vehicle. Thus, data supplied from an external roadside device can be appropriately used also in the in-vehicle network of the receiving vehicle. Thereby, for example, based on signal information provided from a roadside device installed at an intersection or imaging information of an intersection, based on information provided from the outside, such that a vehicle passing through the intersection performs vehicle control. And accurate vehicle control.

[Correspondence between Configuration of Embodiment and Configuration described in Claims]
The correspondence between the configuration of each part of the data communication system of the above embodiment and the configuration described in the claims is as follows.

  The communication ECU (transmission side) 1 mounted on the transmission side vehicle and the communication ECU (transmission side) 1b installed on the road side correspond to the transmission side communication device in the claims. The communication ECU (reception side) 2 mounted on the reception side vehicle corresponds to the communication device in the claims. The control unit 20 of the communication ECU (reception side) 2 corresponds to a generation unit and a transmission unit. The storage unit 21 of the communication ECU (reception side) 2 corresponds to a storage unit.

  DESCRIPTION OF SYMBOLS 1 ... Communication ECU (transmission side), 10 ... Control part, 11 ... Storage part (for reception CANID list), 100 ... In-vehicle ECU, 2 ... Communication ECU (reception side), 20 ... Control part, 21 ... Storage part (CANID Definition database), 200 ... in-vehicle ECU, 300 ... communication bus.

Claims (10)

A communication device that is mounted on a vehicle and transmits transfer data based on external data received from outside by wireless communication to a communication bus of an in-vehicle network in which a plurality of in-vehicle devices are interconnected,
The external data includes net data used for control of the in-vehicle device and transmission source identification information unique to the transmission source,
The communication device
Storage means for storing definition information that defines an in-vehicle network ID that can be discriminated by an in-vehicle device in the in-vehicle network, corresponding to each individual transmission source identification information;
With reference to the definition information stored in the storage means, the in-vehicle network ID corresponding to the transmission source identification information included in the external data received from the outside is specified, and the specified in-vehicle network ID is used as the external data. Generating means for generating transfer data added to the net data included in
A communication apparatus comprising: a transmission unit that transmits the transfer data generated by the generation unit to the communication bus. The communication device according to claim 1,
The external data further includes a data identifier for identifying the net data,
The definition information stored in the storage means defines a plurality of in-vehicle network IDs corresponding to a plurality of the data identifiers for one of the transmission source identification information,
The generating means refers to the definition information, specifies an in-vehicle network ID corresponding to both the transmission source identification information included in the external data and the data identifier related to the net data, and the specified in-vehicle network ID A communication device that generates transfer data in which an ID is added to the net data. The communication device according to claim 1 or 2,
The communication device receives the external data by inter-vehicle communication with a transmission-side communication device mounted on another vehicle. The communication device according to claim 1 or 2,
The communication device receives the external data by road-to-vehicle communication with a transmission-side communication device installed on the roadside. The communication device according to any one of claims 1 to 4,
The in-vehicle network is constructed by CAN (Controller Area Network) standard,
The in-vehicle network ID is an ID for a frame that is a communication unit of CAN,
The generation unit generates a data frame in which an ID for the frame specified based on the definition information is added to net data included in the external data,
The transmission device transmits the data frame generated by the generation unit to the communication bus. A communication device mounted on a vehicle and transmitting transfer data based on external data received from a communication device external to the vehicle by wireless communication to a communication bus of an in-vehicle network in which a plurality of in-vehicle devices are interconnected;
A transmission-side communication device that transmits external data including net data used for control of the in-vehicle device and unique transmission source identification information to the communication device by wireless communication;
The communication device
Storage means for storing definition information that defines an in-vehicle network ID that can be discriminated by an in-vehicle device in the in-vehicle network, corresponding to each individual transmission source identification information;
With reference to the definition information stored in the storage unit, the in-vehicle network ID corresponding to the transmission source identification information included in the external data received from the transmission side communication device is specified, and the specified in-vehicle network ID Generating means for generating transfer data by adding to the net data included in the external data;
A data communication system comprising: sending means for sending the transfer data generated by the generating means to the communication bus. The data communication system according to claim 6, wherein
The external data transmitted by the transmitting communication device further includes a data identifier for identifying the net data,
The definition information stored in the storage means of the communication device is to define a plurality of in-vehicle network IDs respectively corresponding to a plurality of the data identifiers for one source identification information,
The generation unit of the communication device refers to the definition information, specifies the ID for the in-vehicle network corresponding to both the transmission source identification information included in the external data and the data identifier related to the net data. A data communication system characterized by generating transfer data in which an in-vehicle network ID is added to the net data. The data communication system according to claim 6 or 7,
The transmission-side communication device is mounted on a vehicle, and the external data including the net data sent from the in-vehicle device mounted on the vehicle and the transmission source identification information of the transmission-side communication device is sent to the communication device. To send to
The said communication apparatus receives the said external data by the vehicle-to-vehicle communication with the said transmission side communication apparatus mounted in the other vehicle. The data communication system characterized by the above-mentioned. The data communication system according to claim 6 or 7,
The transmission side communication device is installed on the road side and transmits the net data related to the control of the in-vehicle device and external data including transmission source identification information of the transmission side communication device to the communication device. ,
The communication device receives the external data by road-to-vehicle communication with the transmission-side communication device installed on the road side. The data communication system according to any one of claims 6 to 9,
The in-vehicle network connected to the communication device is constructed by CAN (Controller Area Network) standard,
The in-vehicle network ID is an ID for a frame that is a communication unit of CAN,
The generation unit of the communication device generates a data frame in which the ID for the frame specified based on the definition information is added to the net data included in the external data,
The data communication system, wherein the transmission means of the communication device transmits the data frame generated by the generation means to the communication bus.

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