JP6544230B2 - Communications system - Google Patents

Description

  The present invention relates to a communication system mounted on a vehicle such as a passenger car.

An Ethernet communication system mounted on a vehicle such as a passenger car is known (see, for example, Patent Document 1). Ethernet is a registered trademark.
In this type of communication system, when a frame is received from a transmission source such as an external device via Ethernet, the relay device converts the received frame into data of another protocol such as CAN and sends it to a transmission destination such as an ECU Relay. CAN is a registered trademark. For this purpose, for example, there is a technique of specifying a transmission destination of data using an identification number of a received frame. Specifically, the relay apparatus stores a table for searching for a transfer destination of data stored in the frame from the identification number of the frame. Then, the relay apparatus refers to the table, searches the transfer destination of the data from the identification number of the frame included in the received frame, and relays by transmitting the data to the transfer destination which is searched.

JP, 2015-89092, A

  However, the above technology requires a table that covers all combinations of frame identification numbers and data transfer destinations. For this reason, when the types of frames used in this communication system and the transmission destinations connected to the communication system increase, the amount of data in the table increases and the resources for storing the table also increase. There is a problem that the processing load for searching also increases.

  The present invention has been made in view of these problems, and it is an object of the present invention to provide a technology for reducing resources and processing load required for data relay processing in a communication system mounted on a vehicle.

  The communication system (1, 2, 3, 4) of the present invention comprises one or more high speed communication lines (14, 15) which are communication lines for high speed communication, and one or more communication lines for low speed communication. A low speed communication line (11, 12, 13), a relay device (16), and communication devices (21, 22, 23, 33, 32, 33, 41, 42, 43) are provided.

The relay device is connected to the high-speed communication line and the low-speed communication line, and relays data between the high-speed communication line and the low-speed communication line.
The communication device is connected to the low speed communication line, and transmits and receives data via the low speed communication line.

  The low-speed side frame, which is a frame used to transmit and receive data via a low-speed communication line, includes terminal data, which is data transmitted and received by the communication apparatus, and information identifying the content of the terminal data together with the data length of the terminal data. Some data identification information is included.

  One or more data blocks are stored in the high speed side frame which is a frame used for transmission and reception of data through the high speed communication line, and each data block contains terminal data and data length constituting the low speed side frame , Data identification information, and correspondence information associated with the low-speed communication line to which the terminal data is to be transmitted.

The relay device includes a relay execution unit (19a).
When receiving the high-speed side frame, the relay execution unit sequentially acquires the data block from the received high-speed side frame, and transmits the data block to the low-speed communication line specified from the correspondence information included in the acquired data block. Relay the data by

  According to such a configuration, when the high speed side frame is received, the data block is sequentially acquired from the received high speed side frame, and the data is transmitted to the low speed communication line specified from the correspondence information included in the acquired data block. Data is relayed by transmitting blocks. Therefore, as the information for identifying the low speed communication line from the correspondence information, it is sufficient to prepare information of the content that associates one low speed communication line with one correspondence information, and this information amount is also the number of correspondence information. It can be reduced to meet the demand. As a result, even if the number of data identification information used in the present communication system and the number of communication devices connected to the present communication system increase, the correspondence between the correspondence information and the low-speed communication line is improved compared to the prior art. The number of resources for storing the information to be shown can be small, and the processing load for searching the low-speed communication line to which the data block is to be transmitted can be small. Therefore, it is possible to reduce resources and processing load required for data relay processing.

  In addition, the reference numerals in the parentheses described in this column and the claims indicate the correspondence with specific means described in the embodiment described later as one aspect, and the technical scope of the present invention It is not limited.

It is a block diagram showing composition of a communication system of a 1st embodiment. It is a flowchart of the relay process which the relay apparatus of 1st Embodiment performs. It is a block diagram which shows the structure of the communication system of 2nd Embodiment. It is a flowchart of the relay process which the relay apparatus of 2nd Embodiment performs. It is a block diagram which shows the structure of the communication system of 3rd Embodiment. It is a flowchart of the relay process which the relay apparatus of 3rd Embodiment performs. It is a block diagram which shows the structure of the communication system of 4th Embodiment. It is a flowchart of the relay process which the relay apparatus of 4th Embodiment performs.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[1. First embodiment]
[1-1. Constitution]
The communication system 1 shown in FIG. 1 includes a power train domain bus 11, a body domain bus 12, an environment domain bus 13, Ethernet networks 14 and 15, a relay device 16, and ECUs 21, 22 and 23 of a power train system. It comprises ECUs 31, 32, 33 of the body system, ECUs 41, 42, 43 of the environment system, an external device 51 which is an external device, and a DCM 52. Note that Ethernet is also referred to as "Ethernet". Ethernet and "Ethernet" are registered trademarks. Moreover, ECU is described also as "Electronic Control Unit" and is an electronic control unit. Further, DCM is also referred to as "Data Communication Module" and is a wireless communication device.

  Although three ECUs 21, 22, and 23 are illustrated in FIG. 1 with respect to the powertrain ECU, the number may be other than three. Similarly, although three ECUs 31, 32, and 33 are illustrated in FIG. 1 for the body-system ECUs, quantities other than three may be used. Similarly, although three ECUs 41, 42 and 43 are illustrated in FIG. 1 for environment-related ECUs, quantities other than three may also be used.

  The external device 51 is a known configuration that performs vehicle state diagnosis, program rewriting processing, and the like by communicating with each ECU. Also, the DCM 52 is a known configuration that executes wireless communication using a public wireless communication network.

  The power train domain bus 11, the body domain bus 12, and the environment domain bus 13 are communication lines for low-speed communication according to the CAN standard, and the communication speed is up to about 1 Mbps. In addition, CAN is described also as "Controller Area Network." CAN is a registered trademark. Connected to the power train domain bus 11 are power train ECUs 21, 22, 23 such as an engine ECU. Further, to the body domain bus 12, ECUs 31, 32, 33 of a body system such as a meter ECU are connected. Further, to the environment domain bus 13 are connected ECUs 41, 42, 43 of an environmental system such as an ADAS ECU.

  The power train domain bus 11, the body domain bus 12, and the environment domain bus 13 correspond to low-speed communication lines. Also, the ECUs 21, 22, 23, 31, 32, 33, 41, 42, 43 correspond to communication devices.

  A frame used to transmit and receive data via a low speed communication line (hereinafter, low speed side frame) has a CAN ID, a data length, and a CAN payload. CANID is information that identifies the content of data stored in the CAN payload. CANID has a data size of a prescribed data length. The prescribed data length includes, for example, 11 bits and 29 bits. CANID corresponds to correspondence information and data identification information. The data length is a value representing the size of the CAN payload. The CAN payload is an area for storing data transmitted and received by each ECU. Data transmitted and received by each ECU correspond to terminal data.

  The Ethernet networks 14 and 15 are communication lines for high-speed communication of the Ethernet standard, and the communication speed is about 100 Mbps. The Ethernet network 14 corresponds to “Ethernet network 0” in FIG. The Ethernet network 15 corresponds to “Ethernet network 1” in FIG. An external device 51 is connected to the Ethernet network 14. Further, a DCM 52 is connected to the Ethernet network 15. The Ethernet networks 14 and 15 correspond to high-speed communication lines.

  The Ethernet frame (hereinafter referred to as the high-speed side frame) used to transmit and receive data via the high-speed communication line is a well-known Ethernet frame and therefore the description thereof is omitted. However, one or more data blocks are stored in the payload portion of the high speed side frame. Each data block is made up of CANID, data length, and CAN payload that respectively constitute the low speed side frame.

The relay device 16 is connected to a power domain bus 11, a body domain bus 12, an environment domain bus 13, and two Ethernet networks 14 and 15.
The relay device 16 includes an Ethernet transceiver 17, a CAN transceiver 18, and a control unit 19.

  The Ethernet transceiver 17 is an interface for communicating with the external device 51 via a switching hub (not shown). The CAN transceiver 18 is an interface for communicating with the ECU via the relay destination bus.

  The control unit 19 is mainly configured of a known microcomputer having a CPU and a semiconductor memory such as a RAM, a ROM, and a flash memory. Various functions of the control unit 19 are realized by the CPU 19a executing a program stored in the non-transitional tangible recording medium. In this example, the flash memory 19 b corresponds to a non-transitional tangible storage medium storing a program. Also, by executing this program, a method corresponding to the program is executed. The number of microcomputers constituting the control unit 19 may be one or more.

  Further, as shown in FIG. 1, the control unit 19 includes an Ethernet controller 19c and a CAN controller 19d as a configuration of functions realized by the CPU 19a executing a program. The method of realizing these elements constituting the control unit 19 is not limited to software, and some or all of the elements may be realized using hardware combining a logic circuit, an analog circuit, and the like. The CPU 19a corresponds to a relay execution unit.

  The relay device 16 stores the relay destination search table. The relay destination search table is a table indicating the correspondence between the CAN ID and the relay destination bus. The power train domain bus 11, the body domain bus 12, and the environment domain bus 13 correspond to relay destination buses. The relay destination search table is recorded in the flash memory 19b. The relay destination search table corresponds to the low speed side search table.

The relay device 16 relays data between the relay destination bus and the relay destination network. The Ethernet networks 14 and 15 correspond to relay destination networks.
[1-2. processing]
Next, data relay processing performed by the relay device 16 of the communication system 1 will be described with reference to the flowchart of FIG.

  First, in the first step S110, the relay device 16 determines whether or not the high speed side frame has been received via the relay destination network. If it is determined that the high speed side frame has not been received, the present S110 is repeatedly executed until it is determined that the high speed side frame has been received. On the other hand, when it is determined that the high speed side frame has been received, the process proceeds to S120.

  In S120, the relay device 16 determines whether the received high-speed side frame (hereinafter, received frame) is addressed to the ECU. If it is determined that the received frame is addressed to the ECU, the process proceeds to S130. On the other hand, when it is determined that the received frame is not addressed to the ECU, it is determined that the received frame is addressed to the relay device 16, and the process proceeds to S170.

In S130, the relay device 16 acquires the data block at the head among the data blocks included in the received frame. Then, it transfers to S140.
In S140, the relay device 16 specifies the relay destination bus for transmitting the data block from the CAN ID contained in the acquired data block and the relay destination search table, and stores the data block in the specified relay destination bus on the low speed side. Transmit a frame. Then, it transfers to S150.

  In S150, the relay device 16 determines whether all data blocks included in the received frame have been acquired from the received frame. If it is determined that all data blocks have been acquired, this processing ends. On the other hand, if it is determined that there is a data block that has not been acquired, the process proceeds to S160.

  In S160, the relay device 16 acquires a data block stored next to the previously acquired data block transmitted among the data blocks included in the received frame. Then, it transfers to S140.

In S170, the relay device 16 performs predetermined processing on the received frame as the high-speed side frame addressed to the relay device 16. Thereafter, the process ends.
[1-3. effect]
According to the first embodiment described above, the following effects can be obtained.

  That is, when the relay device 16 receives the high-speed side frame, the data block is sequentially acquired from the received high-speed side frame, and the low-speed communication line specified from the correspondence information included in the acquired data block Relays data by transmitting Therefore, as the information for identifying the low speed communication line from the correspondence information, it is sufficient to prepare information of the content that associates one low speed communication line with one correspondence information, and this information amount is also the number of correspondence information. It can be reduced to meet the demand. As a result, even if the number of CANIDs used in the communication system 1 and the number of ECUs connected to the communication system increase, information indicating the correspondence between the CANID and the relay destination bus compared to the prior art can be obtained. It takes less resources to store, and less processing load for searching for the relay destination bus to which the data block is to be transmitted. Therefore, it is possible to reduce resources and processing load required for data relay processing.

[2. Second embodiment]
[2-1. Differences from the First Embodiment]
The basic configuration of the second embodiment is the same as that of the first embodiment, and thus the description of the common configuration will be omitted, and differences will be mainly described. The same reference numerals as those in the first embodiment denote the same components, and reference is made to the preceding description.

  In the communication system 1 of the first embodiment described above, as shown in FIG. 1, the relay destination search table stored in the relay device 16 is a table indicating the correspondence between CAN ID and the relay destination bus. On the other hand, in the communication system 2 of the second embodiment, as shown in FIG. 3, the relay destination search table further differs from the communication system 1 of the first embodiment in that the correspondence with the CAN ID length is also shown. . CANID length is the data length of CANID. The CANID length corresponds to prescribed data length information.

[2-2. processing]
Next, relay processing that the communication system 2 of the second embodiment executes in place of the relay processing of the first embodiment shown in FIG. 2 will be described using the flowchart of FIG. 4. The processes of S210, S220, and S270 in FIG. 4 are the same as the processes of S110, S120, and S170 in FIG.

  In S230, the relay device 16 sequentially searches for data blocks (hereinafter, transmission planned data blocks) including CANID in correspondence relationship in the relay destination search table and CANID matching the CANID length from the data block at the top of the received frame. , The transmission schedule data block initially retrieved is obtained from the received frame. Thereafter, the process proceeds to S240.

  In S240, the relay device 16 specifies the relay destination bus to which the transmission planned data block is to be transmitted, from the CAN ID included in the acquired transmission planned data block and the relay destination search table, and transmits the planned transmission data to the specified relay destination bus. Transmit the low speed side frame containing the block. Thereafter, the process proceeds to S250.

  At S250, it is determined whether or not the relay device 16 has acquired all of the transmission planned data blocks from the received frame. If it is determined that all scheduled transmission data blocks have been acquired, this processing ends. On the other hand, when it is determined that there is a transmission planned data block that has not been acquired, the process proceeds to S260.

  In S260, the relay device 16 acquires, from the reception frame, the transmission planned data block next to the transmission planned data block acquired earlier among the data blocks included in the reception frame. Thereafter, the process proceeds to S240.

[2-3. effect]
According to the second embodiment described above, in addition to the same effects as those of the first embodiment described above, the following effects can be obtained.

  That is, when the relay device 16 searches for a CANID on the received frame side that matches the CANID on the relay destination search table side, the CANID length is also used as a search condition. For this reason, it is possible to cope with the case where a plurality of data blocks having different prescribed data lengths coexist in the reception frame.

[3. Third embodiment]
[3-1. Differences from the Second Embodiment]
The basic configuration of the third embodiment is the same as that of the second embodiment, so the description of the common configuration will be omitted, and differences will be mainly described. The same reference numerals as those in the second embodiment denote the same components, and reference is made to the preceding description.

  In the communication system 2 according to the second embodiment described above, as shown in FIG. 3, the data block stored in the payload portion of the high-speed side frame received by the relay device 16 has CANID and data length respectively constituting the low-speed side frame. And the CAN payload. On the other hand, in the communication system 3 of the third embodiment, as shown in FIG. 5, the relay destination bus ID is further included in the data block stored in the payload portion of the high speed side frame received by the relay device 16. This differs from the communication system 2 of the second embodiment. The relay destination bus ID is a communication line identifier assigned to each of the relay destination buses. The relay destination bus ID corresponds to the correspondence information.

  In the communication system 2 of the second embodiment described above, as shown in FIG. 2, the relay destination search table stored in the relay device 16 is a table indicating the correspondence between CANID, relay destination bus, and CANID length. . On the other hand, in the communication system 3 of the third embodiment, as shown in FIG. 5, the communication of the second embodiment is that the relay destination search table is a table using the relay destination bus ID instead of the CAN ID. It differs from system 2.

[3-2. processing]
Next, a relay process that the communication system 3 of the third embodiment executes in place of the relay process of the second embodiment shown in FIG. 4 will be described using the flowchart of FIG. The processes of S310, S320, and S370 in FIG. 6 are the same as the processes of S210, S220, and S270 in FIG.

In S330, the relay device 16 acquires the data block at the head among the data blocks included in the received frame. Then, it transfers to S340.
In S340, the relay device 16 specifies the relay destination bus for transmitting the data block and the CAN ID length from the relay destination bus ID included in the acquired data block and the relay destination search table, and specifies the data to the specified relay destination bus. Transmit the low speed side frame containing the block. At this time, the CANID length is used to specify where the CANID is stored in the data block. Then, it transfers to S350.

  At S350, it is determined whether or not the relay device 16 has acquired all of the data blocks to be transmitted from the received frame. If it is determined that all scheduled transmission data blocks have been acquired, this processing ends. On the other hand, when it is determined that there is a transmission planned data block that has not been acquired, the process proceeds to S360.

  In S360, the relay device 16 acquires a data block stored next to the previously acquired data block among the data blocks included in the received frame. Then, it transfers to S340.

[3-3. effect]
According to the third embodiment described above, the following effects can be obtained in addition to the effects similar to the effects of the first embodiment described above.

  That is, when the relay device 16 acquires a data block from the received frame, the relay destination bus ID is used as the search condition. For this reason, even if there are a large number of CANIDs to be sent to one relay destination bus, relay destination bus IDs may be prepared for the number of types of CANID lengths for each relay destination bus. As a result, compared to the case where CANID is used as the search condition, the amount of information indicating the correspondence between the correspondence information and the relay destination bus can be reduced, and the resources for storing this information can be reduced. The processing load for searching the relay destination bus to which the data block is to be transmitted can be reduced. Therefore, resources and processing load required for relaying data can be further reduced.

  Also, the relay device 16 specifies the place where the CANID is stored in the acquired data block, using the CANID length. For this reason, it is possible to cope with the case where a plurality of data blocks having different prescribed data lengths coexist in the reception frame.

[4. Fourth embodiment]
[4-1. Differences from the First Embodiment]
The basic configuration of the fourth embodiment is the same as that of the first embodiment, so the description of the common configuration will be omitted, and differences will be mainly described. The same reference numerals as those in the first embodiment denote the same components, and reference is made to the preceding description.

  The communication systems 1 to 3 according to the first to third embodiments described above sequentially transmit the low speed side frames included in the received high speed side frame to the relay destination bus. On the other hand, the communication system 4 of the fourth embodiment is different from the communication systems 1 to 3 of the first to third embodiments in that the received low speed side frame is transmitted to the relay destination network.

  Further, in the communication system 1 of the first embodiment, as shown in FIG. 1, the relay destination search table stored in the relay device 16 is a table indicating the correspondence between CAN ID and the relay destination bus. On the other hand, in the communication system 4 of the fourth embodiment, as shown in FIG. 7, the relay destination search table stored by the relay device 16 includes the relay destination network, relay urgency, and VLANPCP instead of the relay destination bus. It differs from the communication system 1 of the first embodiment in that it is the table used. The relay urgency is information indicating the urgency when transmitting the low speed side frame. The relay urgency is set to “high” which indicates that the data relay urgency is high, or “low” which indicates that the data relay urgency is low. The relay emergency level corresponds to the emergency level information. VLAN PCP is information for specifying the priority when relaying the low speed side frame. VLANPCP is set to any value from a numerical value "0" indicating that the priority when relaying the low speed side frame is the lowest to a numerical value "7" indicating that the priority is the highest. VLAN PCP corresponds to priority information. The relay destination search table is recorded in the flash memory 19b. The flash memory 19 b corresponds to the high speed search table storage unit.

  The communication system 4 of the fourth embodiment is different from the communication system 1 of the first embodiment in that the relay device 16 stores a transmission size table as shown in FIG. The transmission size table is a table showing the correspondence between the relay destination network and the transmission size. The transmission size is information indicating a prescribed amount of data stored in the high speed side frame. The transmission size is preset by an experiment or the like. The transmission size corresponds to the prescribed amount information. The transmission size table is recorded in the flash memory 19b. The flash memory 19 b corresponds to a transmission size table storage unit.

[4-2. processing]
Next, relay processing that the communication system 4 of the fourth embodiment executes in place of the relay processing of the first embodiment shown in FIG. 2 will be described using the flowchart of FIG.

  First, in the first step S410, the relay device 16 determines whether the low speed side frame has been received via the relay destination bus. If it is determined that the low speed side frame has not been received, S410 is repeatedly executed until it is determined that the low speed side frame has been received. On the other hand, if it is determined that the low speed side frame has been received, then the flow shifts to S420.

  In S420, the relay device 16 determines whether the received low-speed side frame (hereinafter, received frame) is addressed to the external device 51 or DCM 52 (hereinafter, external device etc.). If it is determined that the received frame is addressed to an external device or the like, the process proceeds to S440. On the other hand, if it is determined that the received frame is not addressed to an external device or the like, the process proceeds to S430.

In S430, the relay device 16 performs predetermined processing on the received frame as the low-speed side frame addressed to the relay device 16. Thereafter, the process ends.
At S440, the relay device 16 registers the received frame in the transmission buffer. Specifically, the relay device 16 specifies the relay destination network, the relay emergency degree, and the VLAN PCP from the CAN ID included in the received frame and the relay destination search table. The relay device 16 registers, in the transmission buffer for the identified relay destination network, the received frame to which the identified relay urgency and VLANPCP have been assigned. The transmission buffer is a storage area prepared for each relay destination network, and is secured in the flash memory 19b. Also, the relay device 16 generates a transmission scheduled frame. The transmission scheduled frame is a high speed side frame, and each low speed side frame registered in the transmission buffer is stored as a data block. VLANPCP is attached to the transmission planned frame. An arbitrary initial value is set in advance in VLANPCP assigned to the transmission planned frame. The transmission scheduled frame is temporarily stored in the flash memory 19b. Then, it transfers to S450.

  In S450, the relay device 16 determines whether to use VLANPCP to determine whether to transmit a received frame. The determination as to whether or not to use VLAN PCP can be made in various ways depending on the situation, and may be made based on predefined criteria, which is arbitrary. If it is determined that VLANPCP is to be used, then the flow shifts to S460. On the other hand, when it is determined that VLANPCP is not used, the process proceeds to S480.

  In S460, the relay device 16 determines whether the value of VLANPCP assigned to the received frame is larger than the value of VLANPCP assigned to the transmission scheduled frame. If it is determined that the value of VLANPCP assigned to the received frame is less than or equal to the value of VLANPCP assigned to the frame to be transmitted, the process proceeds to S470. On the other hand, when it is determined that the value of VLANPCP assigned to the received frame is larger than the value of VLANPCP assigned to the transmission planned frame, the process proceeds to S480.

  At S470, the relay device 16 determines whether the transmission buffer is empty. If there is no low speed side frame registered in the transmission buffer and it is determined that the transmission buffer is empty, the process proceeds to S480. On the other hand, when it is determined that the low speed side frame registered in the transmission buffer is present and the transmission buffer is not empty, the process proceeds to S490.

  In S480, the relay device 16 updates the value of VLANPCP set in the transmission planned frame to the value of VLANPCP added in the received frame. Thereafter, the process proceeds to S490.

  In S 490, the relay device 16 determines whether the relay urgency level given to the received frame is “low”. If it is determined that the relay urgency level is "low", then the flow shifts to S490. On the other hand, when it is determined that the relay urgency is not “low” but “high”, the process proceeds to S510.

  In S500, the relay device 16 specifies the transmission size from the relay destination network to which the received frame is transmitted and the transmission size table. The relay device 16 compares the specified transmission size with the data amount of the transmission scheduled frame to determine whether the data amount of the transmission scheduled frame is smaller than the transmission size. If it is determined that the amount of data of the transmission scheduled frame is smaller than the transmission size, the present process ends. On the other hand, when it is determined that the data amount of the transmission planned frame is equal to or more than the transmission size, the process proceeds to S510.

In S510, the relay device 16 transmits the transmission planned frame via the relay destination network. Thereafter, the process ends.
[4-3. effect]
According to the fourth embodiment described above, the following effects can be obtained.

  That is, when the relay device 16 transmits the low speed side frame with high degree of urgency, each of the low speed side frame and the low speed side frame pending is stored as a data block in the high speed side frame and transmitted. For this reason, it is possible to store and transmit a plurality of low speed side frames in one high speed side frame, and data relay can be performed efficiently. In addition, with regard to the low speed side frame for which transmission is suspended due to low urgency, the suspension time can be shortened as much as possible.

  Also, the relay device 16 defines the data amount of the data block stored in the high speed side frame using the transmission size. Therefore, the data relay efficiency can be improved and the low speed frame holding time can be increased by increasing the data amount of the data block stored in the high speed side frame while considering the low speed side frame holding time with low urgency. Both shortening and shortening can be realized at a high level.

  Also, the relay device 16 reflects the value of VLANPCP assigned to the received frame in the value of VLANPCP assigned to the transmission scheduled frame. Therefore, the priority of the received frame can be reflected also at the time of data transmission in the relay destination network.

[5. Other embodiments]
As mentioned above, although the form for implementing this invention was demonstrated, this invention can be variously deformed and implemented, without being limited to the above-mentioned embodiment.

  (5-1) Implementing a plurality of functions of one component in the above embodiment by a plurality of components, or realizing a function of one component by a plurality of components It is also good. Also, a plurality of functions possessed by a plurality of components may be realized by one component, or one function realized by a plurality of components may be realized by one component. In addition, part of the configuration of the above embodiment may be omitted. In addition, at least a part of the configuration of the above-described embodiment may be added to or replaced with the configuration of the other above-described embodiment. In addition, all the aspects contained in the technical thought specified only by the words described in the claim are an embodiment of the present invention.

  (5-2) In addition to the communication system described above, the relay apparatus constituting the communication system, a program for causing a computer to function as the relay apparatus, a medium on which the program is recorded, a data relay method, etc. The invention can also be realized.

  1, 2, 3, 4 ... communication system, 11 ... power domain bus, 12 ... body domain bus, 13 ... environment domain bus, 14, 15 ... Ethernet network, 16 ... relay device, 17 ... Ethernet transceiver, 18 ... CAN transceiver , 19: control unit, 19a: CPU, 19b: flash memory, 19c: Ethernet controller, 19d: CAN controller, 21, 22, 23, 31, 32, 33, 41, 42, 43: ECU, 51: External device, 52 ... DCM.

Claims (12)

A communication system (1, 2, 3, 4),
One or more high speed communication lines (14, 15) which are communication lines for high speed communication;
One or more low speed communication lines (11, 12, 13) which are communication lines for low speed communication;
A relay device (16) to which the high speed communication line and the low speed communication line are connected and which relays data between the high speed communication line and the low speed communication line;
Communication devices (21, 22, 23, 33, 32, 33, 34, 41, 42, 43) connected to the low speed communication line and transmitting / receiving data via the low speed communication line;
Equipped with
In the low speed side frame which is a frame used for transmission and reception of data through the low speed communication line, the terminal data which is data transmitted and received by the communication apparatus and the data length of the terminal data are identified. Contains data identification information which is information,
One or more data blocks are stored in the high-speed side frame which is a frame used for transmission and reception of data via the high-speed communication line, and the terminals forming the low-speed side frame are stored in each of the data blocks. Data, the data length, the data identification information, and correspondence information associated with the low-speed communication line to which the terminal data is transmitted;
The relay device is
When the high-speed side frame is received, the data block is sequentially acquired from the received frame that is the received high-speed side frame, and the low-speed communication line identified from the correspondence information included in the acquired data block A relay execution unit (19a) that relays data by transmitting
A low speed side search table storage unit (19b) storing a low speed side search table, which is a table showing a correspondence between the correspondence information, the low speed communication line, and prescribed data length information indicating the data length of the data identification information; provided,
The data identification information is also used as the correspondence information,
The relay execution unit, said communication system that acquires data block from the received frame including the corresponding information that matches the corresponding information to the specified data length information in the corresponding relationship by the low speed side search table (1 , 3) . A communication system (1, 2, 3, 4),
One or more high speed communication lines (14, 15) which are communication lines for high speed communication;
One or more low speed communication lines (11, 12, 13) which are communication lines for low speed communication;
A relay device (16) to which the high speed communication line and the low speed communication line are connected and which relays data between the high speed communication line and the low speed communication line;
Communication devices (21, 22, 23, 33, 32, 33, 34, 41, 42, 43) connected to the low speed communication line and transmitting / receiving data via the low speed communication line;
Equipped with
In the low speed side frame which is a frame used for transmission and reception of data through the low speed communication line, the terminal data which is data transmitted and received by the communication apparatus and the data length of the terminal data are identified. Contains data identification information which is information,
One or more data blocks are stored in the high-speed side frame which is a frame used for transmission and reception of data via the high-speed communication line, and the terminals forming the low-speed side frame are stored in each of the data blocks. Data, the data length, the data identification information, and correspondence information associated with the low-speed communication line to which the terminal data is transmitted;
When the relay apparatus receives the high speed side frame, the relay apparatus sequentially acquires the data block from the received frame which is the received high speed side frame, and the low speed communication identified from the correspondence information included in the acquired data block A relay execution unit (19a) that relays data by transmitting the data block to a line ;
Examples correspondence information, the communication system Ru using the communication line identifier assigned to each of the low-speed communication line (3). The communication system according to claim 2 , wherein
The low speed side search table storage unit stores the low speed side search table, which is a table showing the correspondence between the correspondence information, the low speed communication line, and the prescribed data length information indicating the data length of the data identification information. And 19b),
The communication system (3), wherein the relay execution unit acquires the data block including the correspondence information corresponding to the correspondence information in the low speed side search table and the correspondence information matching the prescribed data length information from the reception frame. The communication system according to any one of claims 1 to 3 , wherein
The relay execution unit identifies the high-speed communication line for transmitting the reception frame from the data identification information included in the reception frame which is the received low-speed side frame when the low-speed side frame is received, and Determine the degree of urgency in transmitting the frame to the high-speed communication line, and if the degree of urgency is low, suspend transmission of the received frame to the high-speed communication line, and if the degree of urgency is high, A communication system (4), wherein data is relayed by storing each of a received frame and the pending received frame as the data block in the high-speed side frame and transmitting the frame to the high-speed communication line. A communication system (1, 2, 3, 4),
One or more high speed communication lines (14, 15) which are communication lines for high speed communication;
One or more low speed communication lines (11, 12, 13) which are communication lines for low speed communication;
A relay device (16) to which the high speed communication line and the low speed communication line are connected and which relays data between the high speed communication line and the low speed communication line;
Communication devices (21, 22, 23, 33, 32, 33, 34, 41, 42, 43) connected to the low speed communication line and transmitting / receiving data via the low speed communication line;
Equipped with
In the low speed side frame which is a frame used for transmission and reception of data through the low speed communication line, the terminal data which is data transmitted and received by the communication apparatus and the data length of the terminal data are identified. Contains data identification information which is information,
One or more data blocks are stored in the high-speed side frame which is a frame used for transmission and reception of data via the high-speed communication line, and the terminals forming the low-speed side frame are stored in each of the data blocks. Data, the data length, the data identification information, and correspondence information associated with the low-speed communication line to which the terminal data is transmitted;
When the relay apparatus receives the high speed side frame, the relay apparatus sequentially acquires the data block from the received frame which is the received high speed side frame, and the low speed communication identified from the correspondence information included in the acquired data block A relay execution unit (19a) that relays data by transmitting the data block to a line ;
The relay execution unit identifies the high-speed communication line for transmitting the reception frame from the data identification information included in the reception frame which is the received low-speed side frame when the low-speed side frame is received, and Determine the degree of urgency in transmitting the frame to the high-speed communication line, and if the degree of urgency is low, suspend transmission of the received frame to the high-speed communication line, and if the degree of urgency is high, A communication system (4) for relaying data by storing each of a received frame and the pending received frame as the data block in the high speed side frame and transmitting it to the high speed communication line . The communication system according to claim 5 , wherein
A communication system (1, 2) using the data identification information as the correspondence information. The communication system according to claim 6 , wherein
The relay apparatus further includes a low speed side search table storage unit (19b) that stores a low speed side search table that is a table indicating a correspondence between the correspondence information and the low speed communication line,
The relay execution unit identifies the low-speed communication line for transmitting the data block from the correspondence information included in the acquired data block and the low-speed side search table. The communication system according to any one of claims 4 to 7 , wherein
The relay apparatus stores a high speed side search table storing a high speed side search table which is a table showing the correspondence between the data identification information, the high speed communication line, and the degree of urgency information indicating the degree of urgency when transmitting the received frame. The storage unit (19b) is further provided,
The relay execution unit identifies the high-speed communication line and the urgency level information from the data identification information included in the received frame and the high-speed side search table. The communication system according to any one of claims 4 to 7 , wherein
The relay execution unit determines the priority when transmitting the received frame, and sets the priority as the priority when transmitting the high-speed side frame in which the received frame is stored as the data block. Communications system. The communication system according to claim 9 ,
The relay apparatus is a correspondence relationship between the data identification information, urgency level information indicating the urgency level when transmitting the high-speed communication line and the reception frame, and priority information indicating priority when transmitting the reception frame. And a high speed search table storage unit (19b) for storing a high speed search table, which is a table indicating
The relay execution unit identifies the high-speed communication line, the urgency level information, and the priority information from the data identification information included in the received frame and the high-speed side search table. The communication system according to any one of claims 4 to 10 , wherein
The relay execution unit determines an amount of data of a transmission scheduled frame which is the high-speed side frame storing each of the reception frame and the pending reception frame as the data block, and the data amount is set in advance. A communication system for transmitting the frame to be transmitted to the high-speed communication line even if the degree of urgency is low if the amount is larger than the amount. The communication system according to claim 11 , wherein
The relay device is
It further comprises a transmission size table storage unit (19b) storing a transmission size table, which is a table showing the correspondence between the high-speed communication line and the prescribed amount.
The relay execution unit identifies the specified amount from the high-speed communication line for transmitting the transmission scheduled frame and the transmission size table.

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