WO2014007067A1

WO2014007067A1 - Communication system, relay apparatus and communication apparatus

Info

Publication number: WO2014007067A1
Application number: PCT/JP2013/066926
Authority: WO
Inventors: 下村好邦
Original assignee: 株式会社オートネットワーク技術研究所; 住友電装株式会社; 住友電気工業株式会社
Priority date: 2012-07-06
Filing date: 2013-06-20
Publication date: 2014-01-09
Also published as: JP5900198B2; JP2014017614A

Abstract

Provided are a communication system, a relay apparatus and a communication apparatus wherein transmitted information of a communication apparatus connected to a communication line can be registered and the extensibility is high. A vehicle-mounted type of communication apparatus (5) transmits, to a relay apparatus (3), transmitted information and received information stored in the vehicle-mounted type of communication apparatus (5). The relay apparatus (3) performs a process of recording, which is based on the transmitted information and received information, into a relay information table. On the basis of the information recorded anew into the relay information table, the relay apparatus (3) can relay frames transmitted and frames received by the vehicle-mounted type of communication apparatus (5), resulting in an enhanced extensibility of communication system.

Description

COMMUNICATION SYSTEM, RELAY DEVICE, AND COMMUNICATION DEVICE

The present invention relates to a communication system, a relay device, and a communication device in which a plurality of communication devices are connected to any one of a plurality of communication lines, and a frame transmitted / received between the plurality of communication devices is relayed by a relay device for communication. About.

In recent years, systems in which a plurality of communication devices are connected, functions are assigned to the respective communication devices, data is mutually exchanged, and various processes are performed in cooperation with each other are used in various fields. For example, in the field of in-vehicle LAN (Local Area Network) distributed to vehicles, the CAN (Controller Area Network) protocol is widely adopted as a communication protocol, and an ECU (Electronic Control Unit) is used as a communication apparatus. Various functions of the system are realized by exchanging data with each ECU by performing specialized processing.

In an in-vehicle communication system based on the CAN protocol, many ECUs are bus-connected on a communication line and communicate with each other. In-vehicle electronic devices have higher performance and higher functionality, and as a result, there are many types of frames (messages) transmitted and received on the communication line, so that communication delays do not occur due to frame transmission waiting. It is necessary to devise the structure of.

Patent Document 1 discloses an in-vehicle communication system that divides a communication line into a plurality of lines and connects a plurality of ECUs to any one of the communication lines to suppress delay. The plurality of communication lines are classified according to the required communication speed, the type of data to be transmitted and received, and the plurality of ECUs are separated and connected to the communication lines. The plurality of communication lines are connected to the relay device, and relay frames transmitted and received between the ECUs by the relay device. The relay device stores a relay information table. In the relay information table, an ID as type identification information for identifying the type of the frame and identification information of the relay destination communication line are recorded, and the relay device uses one communication line based on the relay information table. The frame transmitted by is received and relayed to another communication line.

JP 2010-016764 A

However, the relay apparatus described in Patent Document 1 does not relay frames other than the frame type recorded in the relay information table. Regarding a communication system composed of a plurality of ECUs, a plurality of communication lines and a relay device as an in-vehicle communication system, once the configuration is determined, if there is no change in the configuration, the contents recorded in the relay information table are changed. However, when a new ECU is added to change the model of the in-vehicle communication system, the relay information table has to be recreated, and there is a problem that the expandability is low. Further, it is necessary to perform rewriting of the relay information table on the relay device, which is troublesome.

The present invention has been made in view of such circumstances, and an object of the present invention is to be able to register transmission information of a communication device connected to a communication line and to have a highly expandable communication system, It is to provide a relay device and a communication device.

In the communication system according to the present invention, each of a plurality of communication devices is connected to one of a plurality of communication lines, and a plurality of types of frames transmitted and received between the plurality of communication devices are connected to the plurality of communication lines. In a communication system that performs communication by relaying by an apparatus, the relay apparatus records type identification information for identifying the type of a frame in association with identification information of a communication line that is a relay destination of the frame; and Receiving means for receiving transmission type information including the type identification information of a frame related to transmission from a communication apparatus newly connected to one communication line, and the identification information of the communication line which is a relay destination of the frame; and the receiving means Determining means for determining whether or not the type identification information included in the transmission information received by the method matches the type identification information recorded in the table; And a recording means for recording the type identification information included in the transmission information in the table in association with the identification information of the communication line that is the relay destination of the frame related to the type identification information. .

In the communication system according to the present invention, the reception unit receives reception information including type identification information of a frame related to reception of the newly connected communication device, and the type included in the reception information received by the reception unit. A second determination unit configured to determine whether or not the identification information matches the type identification information recorded in the table; and the recording unit receives the reception when the second determination unit determines that the identification information matches. The identification information of the communication line from which the reception information is received by the means is recorded in the table in association with the type identification information included in the reception information.

In the communication system according to the present invention, the newly connected communication device includes a transmission unit that transmits a connection request frame requesting a communication connection to the one communication line, and the relay device transmits the connection request. It has a transmission means which transmits the connection response frame which responds with respect to a flame | frame, It is characterized by the above-mentioned.

A relay device according to the present invention includes type identification information for identifying a frame type in a relay device that relays a plurality of types of frames transmitted and received between a plurality of communication devices respectively connected to any of a plurality of communication lines. A table recorded in association with the identification information of the communication line that is the relay destination of the frame, the type identification information of the frame related to the transmission from the communication device newly connected to one communication line, and the relay of the frame Receiving means for receiving transmission information including identification information of the previous communication line, and whether or not the type identification information included in the transmission information received by the receiving means matches the type identification information recorded in the table A determination unit that determines whether the type identification information included in the transmission information is the relay destination of the frame related to the type identification information. In association with another information; and a recording means for recording in the table.

In the relay device according to the present invention, the reception unit receives reception information including type identification information of a frame related to reception of the newly connected communication device, and the type included in the reception information received by the reception unit. When the identification information includes second determination means for determining whether or not the identification information matches the type identification information recorded in the relay information table, the recording means determines that the second determination means matches, The identification information of the communication line on which the reception information is received by the reception unit is recorded in the table in association with the type identification information included in the reception information.

The relay device according to the present invention is characterized by having a transmission means for transmitting a connection response frame that responds to a connection request frame transmitted to request a communication connection from the newly connected communication device.

The communication apparatus according to the present invention is configured such that a plurality of communication apparatuses are connected to any one of a plurality of communication lines, and the communication apparatus is connected to a communication system that transmits and receives frames between the plurality of communication apparatuses. A transmission means for transmitting transmission information including the type identification information of the frame and the identification information of the communication line that is the relay destination of the frame is provided.

The communication device according to the present invention is characterized in that the transmission means transmits reception information including type identification information of a frame related to reception.

The communication device according to the present invention is characterized in that the transmission means transmits a connection request frame for requesting a communication connection to a connected communication line.

In the present invention, in the communication system, each of a plurality of communication devices is connected to one of a plurality of communication lines, and a plurality of types of frames transmitted and received between the plurality of communication devices are connected to the plurality of communication lines. The relay device communicates with the relay device. The relay device records the type identification information for identifying the type of frame in the table in association with the identification information of the communication line that is the relay destination of the frame. The relay device receives the transmission type information including the type identification information of the frame related to transmission from the communication device newly connected to one communication line and the identification information of the communication line which is the relay destination of the frame by the receiving unit. The determination means determines whether or not the type identification information included in the received transmission information matches the type identification information recorded in the table, and if the determination means determines NO, the recording means The type identification information included in the transmission information is recorded in the table in association with the identification information of the communication line that is the relay destination of the frame related to the type identification information. Thereby, the relay apparatus can relay the frame transmitted from the communication apparatus newly connected to one communication line, and the expandability of the communication system is enhanced.

In the present invention, the relay device receives the reception information including the type identification information of the frame related to reception of the newly connected communication device by the reception unit, and the type identification information included in the received reception information is: The second determination means determines whether or not the type identification information recorded in the table matches, and when the second determination means determines that they match, the recording means receives the communication line from which the received information is received. The identification information is recorded in the table in association with the type identification information included in the reception information. Thereby, the relay apparatus can relay the frame which the newly connected communication apparatus receives, and the expandability of a communication system improves.

In the present invention, the newly connected communication device transmits a connection request frame requesting communication connection to the one communication line by the transmission means, and the relay device responds to the connection request frame by the transmission means. A connection response frame is transmitted. Thereby, a communication connection state is confirmed between the newly connected communication device and the relay device, and the newly connected communication device is reliably connected to the communication system.

According to the present invention, the relay device records the type identification information for identifying the type of the frame in the table in association with the identification information of the communication line that is the relay destination of the frame. The relay device receives the transmission type information including the type identification information of the frame related to transmission from the communication device newly connected to one communication line and the identification information of the communication line which is the relay destination of the frame by the receiving unit. The determination means determines whether or not the type identification information included in the received transmission information matches the type identification information recorded in the table, and if the determination means determines NO, the recording means The type identification information included in the transmission information is recorded in the table in association with the identification information of the communication line that is the relay destination of the frame related to the type identification information. For this reason, the relay apparatus can relay the frame transmitted from the communication apparatus newly connected to one communication line, and can enhance the expandability of the communication system.

It is a block diagram which shows the structure of the vehicle-mounted communication system which concerns on this invention. It is a block diagram which shows the structure of the relay apparatus shown in FIG. It is explanatory drawing which shows the example of the content of a relay information table. It is a block diagram which shows the structure of the vehicle-mounted communication apparatus shown in FIG. It is explanatory drawing which shows the example of the content of transmission information. It is explanatory drawing which shows the example of the content of reception information. It is a flowchart which shows the process at the time of the registration process in a vehicle-mounted communication apparatus. It is a flowchart which shows the process at the time of the registration process in a relay apparatus. It is explanatory drawing which shows the example of the content of the relay information table after a registration process.

(Embodiment 1)
Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof. In the embodiment described below, a case where the present invention is applied to an in-vehicle communication system (communication system) will be described as an example. FIG. 1 is a block diagram showing a configuration of an in-vehicle communication system 1 according to the present invention. The in-vehicle communication system 1 is mounted on the vehicle 100 and is connected to any of a plurality of communication buses (communication lines) 2a, 2b, 2c using a wire harness or the like and

communication buses

2a, 2b, 2c. Are connected to in-vehicle communication devices (communication devices) 4, 4... As electronic control units (ECUs) for transmitting and receiving data, and

communication buses

2a, 2b, and 2c. A relay device 3 that relays data transmitted by the type communication device 4 to another communication bus. The in-vehicle communication system 1 includes an in-vehicle communication device (newly connected to a communication system constructed by the

communication buses

2a, 2b, 2c, the relay device 3, and the in-

vehicle communication devices

4, 4,. Communication device) 5 is newly connected.

The in-

vehicle communication devices

4, 4... Are connected in a bus type to any of the

communication buses

2a, 2b, 2c and transmit / receive data according to the CAN protocol. The relay device 3 is also connected in a bus form to any of the

communication buses

2a, 2b, 2c. Data transmission / reception between the in-

vehicle communication devices

4, 4,... The frame is transmitted including a message ID (CAN ID) defined for each combination of a plurality of data in the header portion and a plurality of data in the data portion. The in-

vehicle communication devices

4, 4... Transmit a frame including a data group obtained by its own operation.

The in-

vehicle communication devices

4, 4... Are devices that can transmit data including numerical information of various physical quantities such as measured values, calculated values, control values, or can be controlled by a microcomputer such as an engine and a brake. For example, one in-vehicle communication device 4 functions as an ABS (Antilock Brake System) and is connected to a sensor that detects the rotational speed (wheel speed) of the wheel. The in-vehicle communication device 4 controls the brake based on the wheel speed detected via the sensor when the vehicle is braked, and is connected to the

communication buses

2a, 2b, 2c using the measured value of the wheel speed as data. It transmits to the vehicle-mounted

communication devices

4, 4,.

FIG. 2 is a block diagram showing a configuration of the relay device 3 shown in FIG. The relay device 3 includes a CPU (Central Processing Unit) 30 that controls the operation of each component, a ROM 31 using a non-volatile memory such as flash memory, EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically EPROM), A RAM 32 using a memory such as a DRAM (Dynamic Random Access Memory) or an SRAM (Static Random Access Memory), a CAN controller 33 using a network controller compliant with the CAN protocol, and an internal bus 34 are provided. The CPU 30 functions as determination means, second determination means, and recording means in the present invention, and the CAN controller 33 functions as reception means and transmission means in the present invention. The CPU 30, ROM 31, RAM 32, and CAN controller 33 are all connected to the internal bus 34 and can communicate with each other. The CPU 30, ROM 31, RAM 32, CAN controller 33, and internal bus 34 may constitute a microcomputer. The CPU 30 receives power supply from a power supply device such as a vehicle alternator and a battery (not shown), reads various information from the ROM 31 to the RAM 32, controls the CAN controller 33, and transmits and receives frames.

The ROM 31 stores a control program that the CPU 30 reads and executes. In addition, a relay information table (table) 35 referred to by the CPU 30 is stored. Details of the relay information table 35 will be described later. The RAM 32 temporarily stores information generated in the process of the CPU 30 or measurement values represented by signals input from sensors (not shown).

The CAN controller 33 includes a communication control unit 36, a buffer 37, a first transmission / reception unit 38a, a second transmission / reception unit 38b, and a third transmission / reception unit 38c, and provides

communication buses

2a, 2b, 2c according to the CAN protocol. Communication is achieved.

The communication control unit 36 notifies the CPU 30 when a frame is received by the first transmission / reception unit 38a, the second transmission / reception unit 38b, or the third transmission / reception unit 38c. The communication control unit 36 stores the received frames in the buffer 37 in the order of reception. The communication control unit 36 relays the frame based on an instruction from the CPU 30. More specifically, the communication control unit 36 extracts a frame stored in the buffer 37 based on an instruction from the CPU 30, and connects the first transmission / reception unit 38a and the second transmission / reception unit connected to the relay

destination communication buses

2a, 2b, and 2c. The extracted message is delivered and transmitted to the unit 38b or the third transmitting / receiving unit 38c. The buffer 37 uses a RAM such as an SRAM or a DRAM to temporarily store the received message.

The first transmission / reception unit 38a, the second transmission / reception unit 38b, and the third transmission / reception unit 38c include a filter circuit, an AD conversion circuit, and the like, and transmit and receive frames by detecting and outputting differential voltages in the

communication buses

2a, 2b, and 2c. Realize. Whether the communication control unit 36 can monitor the communication status in the

communication buses

2a, 2b, 2c by the first transmission / reception unit 38a, the second transmission / reception unit 38b, and the third transmission / reception unit 38c, and can itself transmit the frame? A frame is transmitted if it can be transmitted. Specifically, the communication control unit 36 may transmit the frame by the first transmission / reception unit 38a while the in-

vehicle communication devices

4, 4... Connected to the communication bus 2a are not transmitting the frame. it can. On the other hand, while the in-

vehicle communication devices

4, 4... Connected to the communication bus 2a are transmitting frames, the communication control unit 36 receives the transmitted frames by the first transmission / reception unit 38a. .

When data transmission is started simultaneously from any one of the in-

vehicle communication devices

4, 4... And the relay device 3 connected to the communication bus 2a, one of the frames is preferentially set by arbitration based on the CAN protocol. To send. Specifically, priority / non-priority of a frame is determined as follows. Frames are transmitted and received by digital signals represented by 0 (zero) bits and 1 bit. The message ID included in the header part at the head of the frame is used as an arbitration field, and arbitration in the communication bus 2a is performed by a bit string in the arbitration field. In the CAN protocol, priority is given to the transmission of a frame having an arbitration field that lasts longer than zero (zero) bits. That is, when the message ID is interpreted as a numerical value, a frame with a smaller numerical value has a higher priority. And the in-

vehicle communication devices

4, 4... Or the relay device 3 that transmit the priority frame win the arbitration. The communication control unit 36 can continue the transmission by the first transmission / reception unit 38a only when the arbitration in the communication bus 2a is won. When the communication control unit 36 loses arbitration, the communication control unit 36 stops transmission by the first transmission / reception unit 38a, switches to reception of a frame transmitted from the in-vehicle communication device 4 that continues other transmission, and the other in-vehicle communication device 4 At the same time, the frame is received.

FIG. 3 is an explanatory diagram showing an example of the contents of the relay information table 35 stored in the ROM 31 of the relay device 3. In the relay information table 35, frames are distinguished and stored by message IDs. In addition, information for identifying the

communication buses

2a, 2b, and 2c to which the in-vehicle communication device 4 that is a frame transmission source is connected and information for identifying the

communication buses

2a, 2b, and 2c that are relay destinations correspond to the message ID. It is remembered. Specifically, “1” is the communication bus 2a to which the first transmission / reception unit 38a is connected, “2” is the communication bus 2b to which the second transmission / reception unit 38b is connected, and “3” is the third transmission / reception. The communication bus 2c to which the part 38c is connected is represented. Furthermore, information for identifying the in-vehicle communication device 4 that transmits the frame is also stored in association with the message ID.

In the content example of the explanatory diagram of FIG. 3, the frame whose message ID is “110” is transmitted from the in-vehicle communication device 4 (ID: 001) connected to the communication bus 2a (bus ID: 1), The communication bus 2b (bus ID: 2) and the communication bus 2c (bus ID: 3) are relay destinations. When the CPU 30 detects the reception of the frame (message ID: 110) from the first transmission / reception unit 38a by the notification from the communication control unit 36, the CPU 30 refers to the relay information table 35 of the ROM 31 and sets the message ID of the received frame. Based on this, the communication bus 2b (bus ID: 2) and the communication bus 2c (bus ID: 3) as relay destinations are specified. The CPU 30 transmits frames from the second transmission / reception unit 38b and the third transmission / reception unit 38c connected to the identified communication bus 2 and communication bus 2c by the communication control unit 36.

FIG. 4 is a block diagram showing the configuration of the newly connected in-vehicle communication device 5 shown in FIG. The in-vehicle communication device 5 includes a CPU 50 that controls the operation of each component, a ROM 51 that uses nonvolatile memory such as flash memory, EPROM, and EEPROM, a RAM 52 that uses memory such as DRAM and SRAM, and a CAN protocol. A CAN controller 53 using a compliant network controller, an input / output interface (hereinafter referred to as input / output I / F) 54, and an internal bus 55 are provided. The CAN controller 53 functions as transmission means in the present invention. The CPU 50, ROM 51, RAM 52, CAN controller 53, and input / output I / F 54 are all connected to the internal bus 55 and can communicate with each other. The CPU 50, ROM 51, RAM 52, CAN controller 53, input / output I / F 54, and internal bus 55 may constitute a microcomputer. The CPU 50 receives supply of power from a power supply device such as a vehicle alternator and a battery (not shown), reads various information from the ROM 51 to the RAM 52, controls the CAN controller 53, and transmits and receives frames.

The ROM 51 stores a control program that the CPU 50 reads and executes. Further, the ROM 51 stores transmission information 56 relating to frames transmitted by the in-vehicle communication device 5 and reception information 57 relating to frames received by the in-vehicle communication device 5. Details of the transmission information 56 and the reception information 57 will be described later.

The RAM 52 temporarily stores information generated in the process of the CPU 50 or measurement values represented by signals input from the sensor 6. The CAN controller 53 realizes communication via the communication bus 2c according to the CAN protocol. A sensor 6 is connected to the input / output I / F 54, and information on various physical quantities is given from the sensor 6 to the CPU 50. The CPU 50 executes control based on information from the sensor 6 and transmits data including the information to the communication bus 2c.

FIG. 5 is an explanatory diagram showing an example of the contents of the transmission information 56 stored in the ROM 51 of the in-vehicle communication device 5, and FIG. 6 shows an example of the contents of the reception information 57 stored in the ROM 51 of the in-vehicle communication device 5. It is explanatory drawing shown. In the transmission information 56 and the reception information 57, frames are distinguished and stored by message IDs. The transmission information 56 includes information for identifying the

communication buses

2a, 2b, and 2c to which the in-vehicle communication device 5 that is a frame transmission source is connected, information for identifying the

communication buses

2a, 2b, and 2c that are relay destinations, Is stored in association with the message ID to identify the in-vehicle communication device 5 of the transmission source that transmits the message. The reception information 57 includes information for identifying the

communication buses

2a, 2b, and 2c as relay destinations regarding the frame received by the in-vehicle communication device 5, and the in-

vehicle communication devices

4, 4. .. Is stored in association with the message ID.

In the example of the contents of the transmission information 56 shown in FIG. 5, the frame with the message ID “500” is the communication bus 2c (bus ID: 3) to which the in-vehicle communication device 5 (ID: 005) as the transmission source is connected. To the relay destination communication bus 2a (bus ID: 1). The frame with the message ID “510” is transmitted from the communication bus 2c (bus ID: 3) to which the in-vehicle communication device 5 (ID: 005), which is the transmission source, to the relay destination communication bus 2a (bus ID). 1) and communication bus 2b (bus ID: 2).

In the example of the contents of the reception information 57 shown in FIG. 6, the frame whose message ID is “100” received by the in-vehicle communication device 5 is the in-vehicle communication device 4 (ID: 001), and the in-vehicle communication device 5 It shows relaying to the communication bus 2c (bus ID: 3) to which the type communication device 5 is connected. Further, the frame whose message ID is “200” received by the in-vehicle communication device 5 is the in-vehicle communication device 4 (ID: 002) as the transmission source, and the communication bus 2c ( Indicates relaying to bus ID: 3).

As described above, the in-vehicle communication device 1 is newly connected to the communication system constructed by the

communication buses

2a, 2b, 2c, the relay device 3, and the in-

vehicle communication devices

4, 4,. Thus, before the in-vehicle communication device 5 is connected, the transmission information 56 and the reception information 57 held by the in-vehicle communication device 5 are not recorded in the relay information table 35 of the relay device 3. When the in-vehicle communication device 5 is connected to the in-vehicle communication system 1, the transmission information 56 and the reception information 57 are registered in the relay information table 35 between the relay device 3 and the in-vehicle communication device 5. In the in-vehicle communication system 1, frames can be transmitted and received between the in-vehicle communication device 5 and the in-

vehicle communication devices

4, 4,.

Next, a process for registering the transmission information 56 and the reception information 57 of the in-vehicle communication device 5 in the relay information table 35 of the relay device 3 when the in-vehicle communication device 5 is connected to the communication bus 2c will be described. FIG. 7 is a flowchart showing processing during registration processing in the in-vehicle communication device 5, and FIG. 8 is a flowchart showing processing during registration processing in the relay device 4.

The CPU 50 of the in-vehicle communication device 5 is activated by receiving power supply, and then transmits a connection request frame for requesting communication connection to the communication bus 2c by the CAN controller 53 (step S11). The connection request frame includes a message ID indicating that it is a frame for requesting communication connection and identification information (ID: 005) unique to the in-vehicle communication device 5. After transmitting the connection request frame, the CPU 50 monitors the communication bus 2 c and waits for a connection response frame from the relay device 3. The connection response frame includes a message ID indicating a connection response and identification information of the in-vehicle communication device 5. The CPU 50 receives the connection response frame by detecting that the message ID of the frame received through the communication bus 2c is a connection response and includes its own identification information (step S12).

After receiving the connection response frame, the CPU 50 transmits a transmission information notification frame to the relay device 3 (step S13). The transmission information notification frame includes a message ID indicating transmission information notification and transmission information 56. Of the transmission information 56, when the relay apparatus 3 receives the connection request frame, if the transmission source bus ID and the transmission source ID are recorded, it may be omitted as appropriate.

After transmitting the transmission information notification frame, the CPU 50 monitors the communication bus 2c and waits for a registration response frame from the relay device 3. The registration response frame includes a message ID indicating a registration response and identification information of the in-vehicle communication device 5. The CPU 50 receives the registration response frame by detecting that the message ID of the frame received via the communication bus 2c is a registration response and including its own identification information (step S14).

After receiving the registration response frame, the CPU 50 transmits a reception information notification frame to the relay device 3 (step S15). The reception information notification frame includes a message ID indicating reception information notification and reception information 57. Of the reception information 57, when the relay device 3 receives the connection request frame, the bus ID of the communication bus 2c to which the in-vehicle communication device 5 is connected is automatically set as the bus ID to be the relay destination. It becomes unnecessary when you do. Further, the received information 57 is unnecessary when the relay apparatus 3 does not perform collation related to the frame transmission source ID.

After transmitting the reception information notification frame, the CPU 50 monitors the communication bus 2c and waits for a registration response frame from the relay device 3. The registration response frame includes a message ID indicating a registration response and identification information of the in-vehicle communication device 5. The CPU 50 receives the registration response frame by detecting that the message ID of the frame received via the communication bus 2c is a registration response, and including its own identification information (step S16). By receiving the registration response frame, the CPU 50 of the in-vehicle communication device 5 ends the processing at the time of registration processing, but it is preferable to write data indicating that the registration processing has been completed into the ROM 51 at the end. When the power is turned off and the power is turned on again, the CPU 50 checks whether there is data indicating that the registration processing is completed in the ROM 51, and if there is data, the above steps S11 to S16 are performed. It is possible not to perform the process.

Next, processing at the time of registration processing in the relay device 3 will be described based on FIG. The CPU 30 of the relay device 3 monitors the communication bus 2c by the third transmission / reception unit 38c of the CAN controller 53, and receives the connection request frame transmitted from the in-vehicle communication device 5 (step S21). The CPU 30 reads the identification information of the in-vehicle communication device 5 that has transmitted the frame from the received connection request frame. A connection response frame including the read identification information is transmitted (step S22).

The CPU 30 monitors the communication bus 2c by the third transmission / reception unit 38c of the CAN controller 53, and receives the transmission information notification frame transmitted from the in-vehicle communication device 5 (step S23). After receiving the transmission information notification frame, the CPU 30 reads the transmission information 56 included in the frame and executes a determination process regarding the transmission information 56. That is, it is determined whether or not the message ID included in the transmission information 56 is recorded in the relay information table 35 (step S24). When the transmission information 56 includes a plurality of message IDs, each message When the ID is determined and not all the message IDs are recorded in the relay information table 35 and are all new message IDs (S24: NO), the message ID included in the transmission information 56 and The corresponding transmission source bus ID, relay destination bus ID, and transmission source ID are registered by recording them in the relay information table 35 (step S25).

FIG. 9 is an explanatory diagram showing an example of the contents of the relay information table 35 after the registration process. By registering the transmission information 56, the relay information table 35 is added with relay information such as the bus ID of the relay destination relating to the frames having the message IDs “500” and “510”.

When the CPU 30 of the relay device 3 determines that the message ID included in the transmission information 56 is recorded in the relay information table 35 after the registration of the transmission information 56 in step S25 and in step S24 (S24: YES), a registration response frame is transmitted to the in-vehicle communication device 5 (step S26). If it is determined that the message ID included in the transmission information 56 is recorded in the relay information table 35, the registration response frame may include data indicating that registration has not been performed. When the in-vehicle communication device 5 receives the registration response message, data indicating that registration has not been performed may be detected, and error information may be notified.

After transmitting the registration response frame in step S26, the CPU 30 monitors the communication bus 2c by the third transmission / reception unit 38c of the CAN controller 53 and receives the reception information notification frame transmitted from the in-vehicle communication device 5 (step S27). ). After receiving the reception information registration frame, the CPU 30 reads the reception information 57 included in the frame and executes a determination process regarding the reception information 57. That is, it is determined whether or not the message ID included in the reception information 57 is recorded in the relay information table 35 (step S28). If the reception information 57 includes a plurality of message IDs, each message When the ID is determined and all the message IDs are recorded in the relay information table 35 (S28: YES), the relay destination bus ID corresponding to the message ID included in the reception information 57 is set as the relay information table 35. It registers by recording (step S29).

In the example of content shown in FIG. 9, by registering the reception information 57, the bus ID “3” is added to the relay information table 35 as the relay destination bus ID for the frames with the message IDs “100” and “200”, respectively. Is done.

When the CPU 30 of the relay device 3 determines that the message ID included in the reception information 57 is not recorded in the relay information table 35 after the registration of the reception information 56 in step S29 is completed and in step S28 (S28: NO), a registration response frame is transmitted to the in-vehicle communication device 5 (step S30). If it is determined that the message ID included in the reception information 57 is not recorded in the relay information table 35, the registration response frame may include data indicating that registration has not been performed. When the in-vehicle communication device 5 receives the registration response message, data indicating that registration has not been performed may be detected, and error information may be notified. By receiving the registration response frame in step S30, the CPU 30 of the relay device 3 ends the process during the registration process.

As described above, the transmission information 56 and the reception information 57 stored in the in-vehicle communication device 5 are transmitted from the in-vehicle communication device 5 to the relay device 3, and based on the transmission information 56 and the reception information 57 in the relay device 3. The recording process to the relay information table 35 is performed. Based on the information newly recorded in the relay information table 35, the relay device 3 can relay the frame transmitted and received by the in-vehicle communication device 5, and can enhance the expandability of the communication system. . The in-vehicle communication device 5 transmits a connection request frame requesting a communication connection to the communication line 2c, and the relay device 3 transmits a connection response frame responding to the connection request frame, so that the communication connection state is confirmed. In addition, the in-vehicle communication device 5 can be reliably connected to the communication system.

It should be understood that the disclosed embodiments are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 In-vehicle communication system (communication system)
2a, 2b, 2c Communication bus (communication line)
3 relay device 30 CPU (determination means, second determination means, recording means)
33 CAN controller (reception means, transmission means)
35 Relay information table (table)
4 In-vehicle communication device (communication device)
5 In-vehicle communication devices (communication devices newly connected)
53 CAN controller (transmission means)
56 Transmission information 57 Reception information

Claims

Each of a plurality of communication devices is connected to one of a plurality of communication lines, and performs communication by relaying a plurality of types of frames transmitted and received between the plurality of communication devices by a relay device connected to the plurality of communication lines. In a communication system,
The relay device is
A table in which type identification information for identifying a type of frame is recorded in association with identification information of a communication line that is a relay destination of the frame;
Receiving means for receiving transmission type information including frame type identification information related to transmission from a communication device newly connected to one communication line, and identification information of a communication line that is a relay destination of the frame;
Determining means for determining whether or not the type identification information included in the transmission information received by the receiving means matches the type identification information recorded in the table;
A recording unit that records the type identification information included in the transmission information in the table in association with the identification information of a communication line that is a relay destination of a frame related to the type identification information when the determination unit determines NO A communication system comprising:
The reception means receives reception information including type identification information of a frame related to reception of the newly connected communication device,
A second determination unit that determines whether or not the type identification information included in the reception information received by the reception unit matches the type identification information recorded in the table;
When the recording unit determines that the second determination unit matches, the recording unit associates the identification information of the communication line on which the reception information is received by the reception unit with the type identification information included in the reception information. The communication system according to claim 1, wherein the communication system is recorded in a table.
The newly connected communication device has a transmission means for transmitting a connection request frame for requesting communication connection to the one communication line,
The communication system according to claim 1, wherein the relay device includes a transmission unit that transmits a connection response frame that responds to the connection request frame.
In a relay device that relays a plurality of types of frames transmitted and received between a plurality of communication devices respectively connected to any of a plurality of communication lines,
A table in which type identification information for identifying a type of frame is recorded in association with identification information of a communication line that is a relay destination of the frame;
Receiving means for receiving transmission type information including frame type identification information related to transmission from a communication device newly connected to one communication line, and identification information of a communication line that is a relay destination of the frame;
Determining means for determining whether or not the type identification information included in the transmission information received by the receiving means matches the type identification information recorded in the table;
A recording unit that records the type identification information included in the transmission information in the table in association with the identification information of a communication line that is a relay destination of a frame related to the type identification information when the determination unit determines NO A relay device comprising:
The reception means receives reception information including type identification information of a frame related to reception of the newly connected communication device,
A second determination unit that determines whether or not the type identification information included in the reception information received by the reception unit matches the type identification information recorded in the relay information table;
When the recording unit determines that the second determination unit matches, the recording unit associates the identification information of the communication line on which the reception information is received by the reception unit with the type identification information included in the reception information. The relay apparatus according to claim 4, wherein the relay apparatus records in a table.
6. The transmission unit according to claim 4, further comprising: a transmission unit that transmits a connection response frame that responds to a connection request frame transmitted to request a communication connection from the newly connected communication device. Relay device.
Each of the plurality of communication devices is connected to one of the plurality of communication lines, and the communication device is connected to a communication system that transmits and receives frames between the plurality of communication devices.
A communication apparatus comprising: transmission means for transmitting transmission information including frame type identification information related to transmission of itself and identification information of a communication line that is a relay destination of the frame.
8. The communication apparatus according to claim 7, wherein the transmission means transmits reception information including frame type identification information related to reception of the terminal itself.
9. The communication apparatus according to claim 7, wherein the transmission unit transmits a connection request frame for requesting a communication connection to a connected communication line.