JP2019047413A - Vehicle network system - Google Patents

Abstract

To provide a vehicle network system capable of appropriately performing communication of an open flow message while suppressing a cost.SOLUTION: A vehicle network system 100 includes a controller A, switches B1-B3, Ethernet signal lines 50, and CAN signal lines 60. The controller A includes an open flow control section 10. The switches B1-B3 include open flow processing sections 20. The controller A and the switches B1-B3 include Ethernet communication control sections 11, 21, CAN communication control sections 12, 22, and communication selection sections 13, 23. The communication selection sections 12, 23 select ones of Ethernet communication control sections 11, 21 and the CAN communication control sections 12, 22 as the communication control sections in transmitting an open flow message in accordance with a factor to give influence on communication of the open flow message.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a vehicle network system.

  As functions required for vehicles become more diverse, it is expected that abolition of restrictions on the mounting position of devices in vehicles, response to the occurrence of abnormal conditions, and response to the addition of new devices will be required. Be done. Software Defined Network is a network mechanism that responds to such a request. Then, as a means for realizing this mechanism, there is an open flow network to which an open flow protocol is applied, like the communication processing device described in Patent Document 1.

JP, 2016-144117, A

  The open flow protocol separates an Ethernet (registered trademark) signal line for transmitting a normal message and an Ethernet signal line for transmitting an open flow message between a controller and each of a plurality of switches. It is recommended to connect. However, vehicle communication in accordance with the Ethernet protocol is not as mature as other vehicle communication in accordance with the CAN (registered trademark) protocol and the like, and therefore the cost is increased as compared with other vehicle communication. Therefore, when applying the open flow protocol to a vehicle network, it can be considered to use one of the two Ethernet signal lines described above as a CAN signal line.

  And in the vehicle network comprised using Ethernet signal line and CAN signal line, communication of the control message for vehicle control and an open flow message is performed. Here, there are factors that affect the open flow message communication, such as the type of the open flow message and the power state of the vehicle. Depending on such factors, sending an open flow message on one of the two signal lines takes time and can not be sent in real time, or can not be sent on one of the two signal lines. Do. It may also be difficult to send control messages in real time if the open flow messages are not sent in real time.

  This indication is made in view of the above-mentioned situation, and it aims at providing a vehicle network system which can perform communication of an open flow message appropriately, controlling cost.

  The present disclosure is a vehicle network system (100) mounted on a vehicle, the first control device (A), a plurality of second control devices (B1 to B3), and a first signal line (50). And a second signal line (60). The first control device has an open flow control unit (10) configured to control the network according to the open flow protocol. The plurality of second control devices have an open flow processing unit (20) configured to execute an instruction from the open flow control unit. The first signal line is a signal line connecting the first control device and each of the plurality of second control devices, and is a signal line for transmitting an Ethernet frame. The second signal line is a signal line which connects the first control device and each of the plurality of second control devices, and is a signal line for transmitting a CAN frame or a CAN-FD frame. Furthermore, each of the first control device and the plurality of second control devices includes an Ethernet communication control unit (11, 21), a CAN communication control unit (12, 22), and a communication selection unit (13, 23). Prepare. The Ethernet communication control unit controls communication according to the Ethernet protocol. The CAN communication control unit controls communication according to the CAN or CAN-FD protocol. The communication selection unit selects one of the Ethernet communication control unit and the CAN communication control unit as the communication control unit when transmitting the open flow message, according to the factor that affects the communication of the open flow message.

  According to the present disclosure, since the first control device and each of the plurality of second control devices are connected by the first signal line for Ethernet communication and the second signal line for CAN communication, two signals are provided. The cost can be reduced compared to the case where both of the lines are signal lines for Ethernet communication. Then, the method of transmitting the open flow message is selected according to the factor affecting the communication of the open flow message. Therefore, the first control device and the plurality of second control devices can appropriately communicate the open flow message according to the above factors. Furthermore, the vehicle network system can be made to operate the open flow protocol even when various factors mentioned above exist.

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

It is a figure showing composition of a vehicle network system of this embodiment. It is a figure which shows the structure of the network system implemented as recommendation of an open flow protocol. It is a figure which shows the structure of the network system which shares Ethernet signal wire by communication of a control message, and communication of an open flow message. It is a flowchart which shows the process sequence of the transmission process of an open flow message. It is an explanatory view showing an example of a communication method selection table. It is a flowchart which shows the process sequence of the reception process by CAN communication. It is a flowchart which shows the process sequence of the reception process by Ethernet communication.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<1. Configuration>
First, the configuration of a network system 100 to which the present disclosure is applied will be described with reference to FIG. The network system 100 is a network system mounted on a vehicle, and includes a main network 30 and sub-networks 40 to 43. The vehicle may be a vehicle of any driving source, such as an engine car, an electric car, a hybrid car and the like.

  The main network 30 includes a controller A, switches B1 to B3, Ethernet (registered trademark) signal lines 51 to 55, and CAN (registered trademark) signal lines 61 to 65. It is a network over which messages are communicated.

  The Ethernet signal lines 51 to 55 are signal lines for transmitting an Ethernet frame in accordance with the Ethernet protocol. Among them, Ethernet signal lines 51 to 53 are signal lines for connecting the controller A and the switches B1 to B3 on a one-to-one basis. The remaining Ethernet signal lines 54 and 55 are signal lines which connect the switch B1 with the switch B2 and the switch B2 with the switch B3 on a one-to-one basis. The Ethernet signal lines 51 to 55 will be collectively referred to as an Ethernet signal line 50 below. The Ethernet signal line 50 corresponds to the first signal line of the present disclosure.

  The CAN signal lines 61 to 65 are signal lines for transmitting a CAN frame in accordance with the CAN protocol. The CAN signal line 61 among them is a main signal line. The remaining CAN signal lines 62 to 65 are sub signal lines connecting the CAN signal line 61 to the controller A and the switches B1 to B3, respectively. That is, the CAN signal lines 61 to 65 constitute a bus network. Hereinafter, the CAN signal lines 61 to 65 are collectively referred to as a CAN signal line 60. The CAN signal line 60 corresponds to a second signal line of the present disclosure.

  Here, the main network 31 implemented according to the open flow protocol is shown in FIG. The main network 31 differs from the main network 30 in that it includes an Ethernet signal line 500 that connects the controller A and each of the switches B1 to B3 on a one-to-one basis, instead of including the CAN signal line 60. That is, in the main network 31, both of the two signal lines are configured by Ethernet signal lines. Therefore, the cost increases.

  Further, FIG. 3 shows a main network 32 in which only one Ethernet signal line 50 is used as a signal line. The main network 32 differs from the main network 30 in that the main network 32 does not include the CAN signal line 60 but only the Ethernet signal line 50. That is, the main network 32 transmits all of the open flow messages and control messages over the Ethernet signal line 50. Therefore, the increase in cost is suppressed. However, when all the messages are transmitted by the Ethernet signal line 50, the communication bandwidth of the Ethernet signal line 50 may be tight. Further, when all the messages are transmitted by the Ethernet signal line 50, there is a possibility that the controller A can not receive the open flow message of the abnormality detection when the abnormality occurs in the Ethernet signal line 50. Therefore, even if an abnormality occurs, the failsafe function may not be realized.

  For the two examples described above, the main network 30 according to the present embodiment includes the Ethernet signal line 50 and the CAN signal line 60. Therefore, it is possible to maintain the fail-safe function of the open flow network even if an abnormality occurs while suppressing an increase in cost.

  The controller A is an ECU that includes a CPU, a ROM, a RAM, an I / O, and the like, and functions as a controller in the open flow protocol. The sub network 40 is connected to the controller A. The controller A includes an open flow control unit 10, an Ethernet communication control unit 11, a CAN communication control unit 12, and a communication selection unit 13. Each function of the controller A is realized by at least one of hardware and software. The controller A corresponds to a first control device of the present disclosure.

  The switches B1 to B3 are ECUs that include a CPU, a ROM, a RAM, an I / O, and the like, and function as switches in the open flow protocol. Each of the subnetwork 41 to 43 is connected to each of the switches B1 to B3. The controller A and the switches B1 to B3 relay transmission of control messages for vehicle control between the subnetwork 40 to 43.

  In the present embodiment, since the switches B1 to B3 have the same configuration, the configuration of the switch B1 will be representatively described. The switch B1 includes an open flow processing unit 20, an Ethernet communication control unit 21, a CAN communication control unit 22, and a communication selection unit 23. The switches B1 to B3 correspond to the second control device of the present disclosure.

  The open flow control unit 10 controls the main network 30 in accordance with the open flow protocol. Specifically, the open flow control unit 10 transmits an open flow message according to the open flow protocol to the switches B1 to B3. The open flow message is a message exchanged between the controller A and the switches B1 to B3. The open flow message includes messages for setting the switches B1 to B3, that is, messages for setting communication rules of the main network 30, and messages for acquiring information.

  The open flow processing unit 20 executes in accordance with the open flow message from the open flow control unit 10. For example, when the switch B1 receives an open flow message for setting a communication rule, the open flow processing unit 20 sets a communication rule of the switch B1 according to the open flow message.

  Further, when the switch B1 receives an open flow message for information acquisition, the open flow processing unit 20 causes the controller A to transmit information corresponding to the request as the open flow message. Further, the open flow processing unit 20 causes the controller A to transmit the load state or the abnormal state of the main network 30, and detection information when a new network node is detected, by an open flow message.

  The Ethernet communication control units 11 and 21 control communication according to the Ethernet protocol. That is, the Ethernet communication control units 11 and 21 transmit and receive Ethernet frames via the Ethernet signal line 50. In the following, communication via the Ethernet signal line 50 performed by the Ethernet communication control units 11 and 12 is referred to as Ethernet communication.

  The CAN communication control units 12 and 22 control communication according to the CAN protocol. That is, the CAN communication control units 12 and 22 perform transmission and reception of the CAN frame via the CAN signal line 60. Hereinafter, the communication performed via the CAN signal control unit 12, 22 via the CAN signal line 60 will be referred to as CAN communication.

  The communication selection units 13 and 23 are Ethernet communication control units 11 and 21 and CAN communication control units 12 and 22 as communication control units at the time of transmitting an open flow message according to factors that affect communication of the open flow message. Choose one or the other. That is, the communication selection units 13 and 23 select which of the Ethernet communication and the CAN communication to transmit the open flow message, and causes the open flow message to be transmitted by the selected communication method. The factors that affect the open flow message communication are predetermined and include the type of the open flow message and the power state of the vehicle.

  The sub-networks 40 to 43 are configured by connecting communication devices such as a plurality of ECUs to CAN signal lines 70 to 73, respectively. The CAN signal lines 70 to 73 are signal lines for communicating a CAN frame in accordance with the CAN protocol. Communication devices such as ECUs mounted on vehicles are classified according to the mounting position, function, etc. of the vehicles to constitute a subnetwork. The CAN signal lines 70 to 73 may be signal lines for transmitting a frame according to a protocol other than the CAN protocol.

  In the present embodiment, communication of a control message and an open flow message is performed in the main network 30, and communication of a control message is performed in the subnetwork 40-43. The control message is a message for controlling the vehicle, such as a command to a predetermined ECU. For example, a control message from the node C11 connected to the subnetwork 41 to the node C21 connected to the subnetwork 42 is relayed by the switches B1 and B2 and transmitted via the Ethernet signal line 54.

  And in the main network 30, Ethernet communication having a higher communication speed than CAN communication is basically used for communication of control messages. However, Ethernet frames have a larger data size that can be transferred than CAN frames. Therefore, in the main network 30, the controller A and the switches B1 to B3 collectively transmit a plurality of CAN frames received from the nodes of the subnetwork 40 to 43 into one Ethernet frame. For example, when the controller A receives three CAN frames addressed to the nodes C11, C12, and D13 of the subnetwork 41 from the nodes C01, 02, and 03 of the subnetwork 40, three CAN frames are combined into one. Make it an Ethernet frame. Then, the controller A transmits the Ethernet frame to the switch B1. The switch B1 divides the received Ethernet frame into three CAN frames and transmits them to the nodes C11, C12, and 13.

  On the other hand, in the main network 30, for communication of the open flow message, as described above, the communication method selected by the communication selection unit 13 or 23 is used. The open flow message has different message length, communication frequency and communication timing depending on its type. When communication of an open flow message with a long message length is performed by CAN communication, communication takes time and it may be difficult to perform communication in real time. As a result, it may be difficult to communicate control messages in real time, or the communication bandwidth of Ethernet communication may be tightened. Further, if communication of an open flow message with high communication frequency is performed by Ethernet communication, the communication bandwidth of the Ethernet signal line 50 may be reduced. Therefore, the controller A and the switches B1 to B3 transmit the open flow message by the communication method selected according to the type of the open flow message.

  Also, the power state of the vehicle includes three states: battery on state, accessory on state, and ignition on state. In the ignition on state, when the vehicle is an engine car, the engine is operating, and when the vehicle is an electric car or a hybrid car, electric power is supplied to the traveling motor, and the traveling motor is It is in an operable state. Further, in the present embodiment, the controller A and the switches B1 to B3 are connected to the CAN communication control units 12 and 22 connected to the CAN communication line 60 and the Ethernet communication line 50 in order to reduce the power consumption of the entire vehicle. The switched Ethernet communication control units 11 and 21 are switched to the operating state or the non-operating state according to the power supply state of the vehicle. For example, when the power state of the vehicle is in the battery on state, both CAN communication control units 12 and 22 and Ethernet communication control units 11 and 21 are in the inoperative state, and in the accessory on state, CAN communication control varies depending on the vehicle configuration. The units 12 and 22 are in the operating state, and the Ethernet communication control units 11 and 21 are in the non-operating state, and in the ignition on state, both the CAN communication control units 12 and 22 and the Ethernet communication control units 11 and 21 are in the operating state. In the accessory on state, both of the CAN communication control units 12 and 22 and the Ethernet communication control units 11 and 21 may be in an operating state.

  Therefore, depending on the power supply state of the vehicle, the open flow message can not be transmitted using Ethernet communication. Therefore, the open flow message is transmitted by the communication method selected according to the power supply state of the vehicle.

<2. Transmission process>
Next, a processing procedure for transmitting an open flow message will be described with reference to the flowchart of FIG. The open flow message transmission process of the present embodiment is one of the processes executed by the communication selection units 13 and 23. The communication selection units 13 and 23 execute this transmission process each time an open flow message transmission request is received from the open flow control unit 10 or the open flow processing unit 20.

  First, in S10, the power supply state of the vehicle is confirmed. In S15, the operation state of the Ethernet communication control unit 11, 21 corresponding to the power supply state of the vehicle and the operation state of the CAN communication control 12, 22 are confirmed. In S15, when only the CAN communication control units 12 and 22 are in the operating state, the process proceeds to S70, and the CAN communication control units 12 and 22 transmit the open flow message.

  If only the Ethernet communication control units 11 and 21 are in operation at S10, the process proceeds to S60, and the Ethernet communication control units 11 and 21 transmit an open flow message.

Further, in S10, when both the Ethernet communication control units 11 and 21 and the CAN communication control units 12 and 22 are in the non-operation state, the present process is ended.
Furthermore, in S15, when both of the Ethernet communication control units 11 and 21 and the CAN communication control units 12 and 22 are in the operating state, the process proceeds to S30, and the type of the open flow message to be transmitted is confirmed.

  Subsequently, in S40, a communication method corresponding to the type of the open flow message confirmed in S30 is acquired with reference to the communication method selection table. The communication method selection table is a table in which the types of open flow messages are associated with the communication methods of the open flow messages, and is stored in advance in the memory of the controller A and the switches B1 to B3. FIG. 5 shows an example of the communication method selection table.

  As types of open flow messages, as shown in FIG. 5, Hello message, Echo Request message, Echo Reply message, Error message, Features Request message, Features Reply message, Packet Out message, Status Request message, Status Reply message, etc. is there.

  The Hello message is a message used when the connection between the controller A and the switches B1 to B3 is started. The Echo Request message is a message used for alive monitoring of the connection between the controller A and the switches B1 to B3, and the Echo Reply is a reply message thereto. The Error message is a message for notifying an error. The Features Request is a message for the controller A to request the switches B1 to B3 for switch information, and the Features Reply is a message for the switches B1 to B3 to send back the switch information. Packet Out is a message for the controller A to send packets output from the switches B1 to B3. Status Request is a message for the controller A to request the switches B1 to B3 for statistical information, and Status Reply is a message for the switches B1 to B3 to send back the statistical information.

  In the communication method selection table, CAN communication is associated with an open flow message whose message length is shorter than a preset length threshold, and Ethernet communication is associated with an open flow message whose message length is longer than the length threshold. It may be associated. The type of open flow message used in this case is the message length. Alternatively, in the communication method selection table, CAN communication may be associated with an open flow message in which the message length is shorter than the length threshold and the communication frequency is higher than the preset frequency threshold. Then, in the communication method selection table, Ethernet communication may be associated with an open flow message in which the message length is longer than the length threshold or the communication frequency is lower than the frequency threshold. The type of the open flow message used in this case is the message length and the communication frequency.

  In the communication method selection table shown in FIG. 5, the upper column indicates an open flow message with a short message length and high communication frequency, and the lower column indicates an open flow message with a long message length or low communication frequency. There is. In general, an open flow message with a long message length is a message for setting communication rules, and is only transmitted when the controller A and switches B1 to B3 are activated. That is, in general, an open flow message with a long message length is transmitted before the start of transmission of a control message, and communication frequency is low. Therefore, even if an open flow message with a long message length is transmitted by Ethernet communication, the possibility of squeezing the communication band of Ethernet communication is low.

  The controller A changes the length threshold and the frequency threshold, changes the correspondence between the open flow message type and the communication method, changes its own communication method selection table, and communicates with the switches B1 to B3. The method selection table may be changed.

  Subsequently, in S50, the communication method acquired in S40 is determined. If it is determined in S50 that the communication method is Ethernet communication, the process proceeds to S60, and the Ethernet communication control units 11 and 21 transmit an open flow message. On the other hand, if it is determined in S50 that the communication method is CAN communication, the process proceeds to S70, and the CAN communication control units 12 and 22 transmit an open flow message. This is the end of the process.

<3. Reception process>
Next, a processing procedure for receiving a CAN frame message will be described with reference to the flowchart of FIG. The CAN reception process of the present embodiment is one of the processes executed by the CAN communication control units 12 and 22. The CAN communication control units 12 and 22 execute the CAN reception process each time a CAN frame message is received.

  First, in S100, the CAN ID of the received message is confirmed. In the network system 100, each CAN ID is associated in advance as to whether it is an open flow message or not and an ECU of a transmission destination.

  Subsequently, in S110, it is determined whether the CAN ID confirmed in S100 is a CAN ID for an open flow message. If the CAN ID confirmed in S100 is a CAN ID for an open flow message, the process proceeds to S120. In S120, the received message is acquired as an open flow message and controlled.

  On the other hand, if the CAN ID confirmed in S100 is not a CAN ID for an open flow message, that is, if it is a CAN ID for a control message, the process proceeds to S130. In S130, the received message is acquired as a control message and controlled. This is the end of the process.

  Next, a processing procedure for receiving an Ethernet frame message will be described with reference to the flowchart of FIG. The Ethernet reception process of this embodiment is one of the processes executed by the Ethernet communication control units 11 and 21. The Ethernet communication control units 11 and 21 execute the Ethernet reception process each time a message of an Ethernet frame is received.

  First, in S200, the received message is confirmed. Specifically, the VLAN set in the OSI Layer 2 of the received message or the logical port set in the OSI Layer 4 is confirmed.

  Subsequently, in S210, it is determined whether the received message is an open flow message. Specifically, if the VLAN set in OSI Layer 2 of the received message is the VLAN for open flow or the logical port set in OSI Layer 4 is the port for open flow, the received message is an open flow message It is determined that If it is determined in S210 that the received message is an open flow message, the process proceeds to S220. In S220, the received message is acquired as an open flow message and controlled.

  On the other hand, when it is determined in S210 that the received message is not an open flow message, that is, when it is determined as a control message, the process proceeds to S230. In S230, the received message is acquired as a control message and controlled. This is the end of the process.

<5. Effect>
According to the present embodiment described above, the following effects can be obtained.
(1) Since the controller A and each of the plurality of switches B1 to B3 are connected by the Ethernet signal line 50 and the CAN signal line 60, compared to the case where both of the two signal lines are Ethernet signal lines Cost can be reduced. Then, the method of transmitting the open flow message is selected according to the factor affecting the communication of the open flow message. Therefore, the controller A and the switches B1 to B3 can appropriately communicate the open flow message according to the above factors. Furthermore, the vehicle network system can be operated with an open flow protocol, even in the presence of various of the above factors.

  (2) A transmission method of the open flow message is selected according to the power supply state of the vehicle. Therefore, even when the Ethernet communication control units 11 and 21 are in the non-operating state in order to reduce power consumption, the controller A and the switches B1 to B3 can operate the CAN communication control units 12 and 22 in the operating state. It can be used to send open flow messages.

  (3) After the Ethernet communication control units 11 and 21 are activated, the communication method is selected according to the type of the open flow message. Therefore, even when communication of control messages starts and the communication load of Ethernet communication becomes high, the controller A and the switches B1 to B3 transmit the open flow message while suppressing the communication bandwidth of the Ethernet communication from becoming tight. be able to.

  (4) The information for protocol control in one CAN frame is less than the information for protocol control in one Ethernet frame. Therefore, open flow messages of relatively short message length are transmitted by CAN communication. This can improve communication efficiency. Further, the controller A and the switches B1 to B3 increase the communication speed while suppressing the communication bandwidth of the Ethernet communication from being restricted by transmitting an open flow message of a relatively long message length using the Ethernet communication. be able to.

  (5) The controller A and the switches B1 to B3 transmit the open flow message while further suppressing the communication bandwidth of the Ethernet communication from being restricted by selecting the communication method according to the communication frequency in addition to the message length. can do.

(Other embodiments)
As mentioned above, although the form for implementing this indication was described, this indication can be variously deformed and implemented, without being limited to an above-mentioned embodiment.

  (A) In the above embodiment, when both the CAN communication control units 12 and 22 and the Ethernet communication control units 11 and 21 are in the operating state, the controller A and the switches B1 to B3 are selected according to the type of the open flow message. Although the communication method is selected, the present disclosure is not limited thereto. The controller A and the switches B1 to B3 open flow messages by Ethernet communication regardless of the type of open flow message when both the CAN communication control units 12 and 22 and the Ethernet communication control units 11 and 21 are in the operating state. It may be sent. Even in this case, the controller A and the switches B1 to B3 can transmit the open flow message using the CAN communication that is in the operating state, when the Ethernet communication is in the non-operating state.

  (B) In the flowchart of FIG. 4 according to the above embodiment and the variation thereof, the controller A and the switches B1 to B3 may not execute the processes of S10, S15, and S20. That is, the controller A and the switches B1 to B3 may select the communication method only in accordance with the type of the open flow message regardless of the operation state of the communication control unit. Even in this case, the controller A and the switches B1 to B3 can perform the open flow message communication without narrowing the communication bandwidth of the control message of the vehicle. However, in this case, it is necessary to perform fail-safe processing when communication is not correctly performed.

  (C) In the above-mentioned embodiment and its modification, CAN signal wire 60 may be a signal wire for transmitting a CAN-FD frame according to CAN-FD protocol. In this case, the CAN communication control units 12 and 22 are configured as a communication control unit that controls communication according to the CAN-FD protocol, and the communication selection units 13 and 23 select CAN-FD communication instead of CAN communication. It should be configured to

  (D) The multiple functions of one component in the above embodiment may be realized by multiple components, or one function of one component may be realized by multiple components. . 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. Further, 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 this indication.

  DESCRIPTION OF SYMBOLS 10 ... Open flow control part, 11, 21 ... Ethernet communication control part, 12, 22 ... CAN communication control part, 13, 23 ... Communication selection part, 20 ... Open flow processing part, 51-55 ... Ethernet signal line, 61- 65: CAN signal line, 100: network system, A: controller, B1 to B3: switch.

Claims (9)

A vehicle network system (100) mounted on a vehicle,
A first control device (A) comprising an open flow control unit (10) configured to control a network according to an open flow protocol;
A plurality of second control devices (B1 to B3) having an open flow processing unit (20) configured to execute an instruction from the open flow control unit;
A signal line connecting the first control device and each of the plurality of second control devices, and a first signal line (51 to 55) for transmitting an Ethernet (registered trademark) frame;
A signal line connecting the first control device and each of the plurality of second control devices, and a second signal line (61 to 65) for transmitting a CAN (registered trademark) frame or a CAN-FD frame When,
Equipped with
Each of the first control device and the plurality of second control devices is
An Ethernet communication control unit (11, 21) configured to control communication according to the Ethernet protocol;
A CAN communication control unit (12, 22) configured to control communication according to CAN or CAN-FD protocol;
The communication control unit when transmitting the open flow message is configured to select any one of the Ethernet communication control unit and the CAN communication control unit according to the factor affecting the open flow message communication. The selected communication selection unit (13, 23),
Equipped with
Vehicle network system. The factor includes the type of open flow message,
The communication selection unit is configured to select the communication control unit according to the type of the open flow message.
The vehicle network system according to claim 1. The factors include operating states of the Ethernet communication control unit and the CAN communication control unit,
The communication selection unit selects the communication control unit according to the operation state of the Ethernet communication control unit and the CAN communication control unit.
The vehicle network system according to claim 1. The factors include the power state of the vehicle,
The communication selection unit selects the communication control unit according to a power supply state of the vehicle and an operation state of the Ethernet communication control unit and the CAN communication control unit corresponding thereto.
The vehicle network system according to claim 1. The power state includes three states: battery on state, accessory on state, and ignition on state.
The Ethernet communication control unit is in a non-operating state when the power state is the battery on state, and is in an operating state when the power state is the accessory on state and the ignition on state.
The CAN communication control unit is inoperative when the power supply state is the battery on state, and is operative when the power supply state is the accessory on state and the ignition on state, and the communication selection unit is
When the power supply state is the battery on state, neither the CAN communication control unit nor the Ethernet communication control unit is selected,
When the power supply state is the accessory on state or the ignition on state, the Ethernet communication control unit is selected.
The vehicle network system according to claim 4. The power state includes three states: battery on state, accessory on state, and ignition on state.
The Ethernet communication control unit is in the non-operating state when the power state is the battery on state and the accessory on state, and is in the operating state when the power state is the ignition on state.
The CAN communication control unit is inoperative when the power supply state is the battery on state, and is operative when the power supply state is the accessory on state and the ignition on state, and the communication selection unit is
When the power supply state is the battery on state, neither the CAN communication control unit nor the Ethernet communication control unit is selected,
When the power supply state is the accessory on state, the CAN communication control unit is selected,
When the power supply state is the ignition on state, the Ethernet communication control unit is configured to be selected.
The vehicle network system according to claim 4. The communication selection unit
When only the CAN communication control unit among the CAN communication control unit and the Ethernet communication control unit is in an operating state, the CAN communication control unit is selected,
When the Ethernet communication control unit and the CAN communication control unit are both in an operating state, the communication control unit is configured to be selected according to the type of the open flow message.
The vehicle network system according to claim 3. The type of open flow message includes the message length,
The communication selection unit
When the message length is shorter than a set length threshold, the CAN communication control unit is selected,
The Ethernet communication control unit is configured to be selected when the message length is longer than the length threshold.
A vehicle network system according to any one of claims 2 and 7. The open flow message type includes message length and communication frequency,
The communication selection unit
When the message length is shorter than the set length threshold and the communication frequency is higher than the set frequency threshold, the CAN communication control unit is selected.
When the message length is longer than the length threshold or when the communication frequency is lower than the frequency threshold, the Ethernet communication control unit is selected.
A vehicle network system according to any one of claims 2, 7 and 8.

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