JP2012182607A - Communication disruption determination system and communication node, and communication disruption determination method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make determination of communication disruption between communication nodes easy.SOLUTION: A communication disruption determination system for determining communication disruption between communication nodes comprises a first communication node. The first communication node comprises: a data reception determination unit for determining whether data which should be received from another communication node has been received; a storage unit for storing information indicating the data which has not been received if the data reception determination unit determines that the data to be received has not been received; and a notification unit for notifying a failure diagnosis device of the information indicating the data which has not been received stored in the storage unit. The failure diagnosis device comprises: a table indicating association between information indicating data and a communication node which should transmit the data; a communication node identification unit for identifying another communication node corresponding to the information indicating the data notified by the communication node based on the table; and an output unit for outputting information indicating the identified other communication node.

Description

  The present invention relates to a communication system mounted on a vehicle, for example.

  In many cases, a vehicle-mounted network is configured in a vehicle to perform various controls in the vehicle. The in-vehicle network is realized by connecting many electronic control units (ECUs), sensors, actuators and the like to the LAN. Hereinafter, electronic control units, sensors, actuators, and the like connected to the in-vehicle network are referred to as communication nodes. The communication node is installed at various positions in the vehicle. Communication nodes are connected by communication lines or electric wires.

  Of the plurality of communication nodes included in the in-vehicle network, at least some of the communication nodes may have a function of monitoring communication abnormality. A communication node having a function of monitoring the communication abnormality is sometimes called a “monitoring node”. The monitoring node has a table indicating correspondence between an identifier for identifying data to be received from another communication node and a communication node that transmits the data. When the data to be received from other communication nodes is not received, the monitoring node refers to the table and identifies the communication node that transmits the data corresponding to the identifier of the data that should have been received. The monitoring node stores the identified communication node.

  When failure diagnosis is performed, a failure diagnosis device is connected to the in-vehicle network. The failure diagnosis apparatus requests information representing the specified communication node from the monitoring node. The monitoring node notifies information representing the specified communication node in accordance with a request from the failure diagnosis apparatus. The failure diagnosis apparatus displays information representing the communication node notified by the monitoring node as the communication node in which communication interruption has occurred.

  For example, there is the following disclosure regarding a device that displays a failure (for example, Patent Document 1).

  The control device stores the generated failure as bit information including a series of bits. Based on the bit information received from the control device, the device that displays a failure searches a failure database provided in the external storage device and displays failure information that matches the bit information.

JP-A-11-202935

  When the monitoring node has a table indicating correspondence between an identifier for identifying data to be received from another communication node and a communication node that transmits the data, a memory for storing the table includes is necessary. As the number of communication nodes included in the in-vehicle network increases, the required memory capacity also increases.

  In addition, since vehicles are deployed in various countries and regions, different functions may be required for each destination such as the deployed countries and regions. When different functions are required for each destination, it is assumed that data transmitted and received by communication nodes included in the in-vehicle network are also different. For example, the number of data to be transmitted / received may increase. In this case, since the identifiers of the data are also different, it is necessary to change the table to be stored in the monitoring node.

Moreover, it is assumed that the data transmitted and received by the communication nodes included in the in-vehicle network are different due to the different specifications. For example, the number of data to be transmitted / received may increase or decrease. In this case, since the identifier of the data may be different, it is necessary to change the table to be stored in the monitoring node.The present invention has been made in view of the above points, and communication between communication nodes is interrupted. The purpose is to judge.

This communication disruption judgment system is
A communication interruption determination system for determining communication interruption between communication nodes,
The first communication node is
A first data reception determination unit that determines whether data to be received from another communication node is received;
A first storage unit that stores information representing data that is not received when the first data reception determination unit determines that the data to be received is not received;
A first diagnostic unit for notifying the failure diagnosis apparatus of information representing unreceived data stored in the first storage unit;
The fault diagnosis apparatus is
A first table representing correspondence between information representing data and a communication node to which the data is to be transmitted;
A communication node identifying unit that identifies another communication node corresponding to information representing data notified by the first communication node based on the first table;
And an output unit that outputs information representing another communication node specified by the communication node specifying unit.

This communication node
A communication node in a communication system having a plurality of communication nodes,
A data reception determination unit that determines whether data to be received from another communication node is received;
A storage unit that stores information representing data that is not received when the data reception determination unit determines that the data to be received is not received;
A notifying unit for notifying the failure diagnosis apparatus of information representing unreceived data stored in the storage unit.

This communication node
A communication node in a communication system having a plurality of communication nodes,
A receiving unit that receives information representing data determined not to be received by the other communication node from another communication node;
A storage unit for storing information representing data determined not to be received by the other communication node received by the receiving unit;
A notification unit for notifying the failure diagnosis apparatus of information representing unreceived data stored in the storage unit.

This communication interruption determination method is
A communication interruption determination method in a communication interruption determination system for determining communication interruption between communication nodes,
The communication node is
A data reception determination step for determining whether or not data to be received from another communication node has been received;
A storage step of storing information representing the data that is not received when it is determined that the data to be received is not received in the data reception determination step;
A notification step of notifying the failure diagnosis apparatus of information representing the unreceived data stored by the storage step;
The fault diagnosis apparatus is
A communication node specifying step of specifying another communication node corresponding to the information indicating the data notified by the communication node, based on a table indicating the correspondence between the information indicating the data and the communication node to which the data is to be transmitted; ,
An output step of outputting information representing another communication node specified by the communication node specifying step.

  According to the disclosed embodiment, it is possible to determine communication interruption between communication nodes.

It is explanatory drawing which shows the communication system and failure diagnosis apparatus according to a present Example. It is explanatory drawing which shows the communication system and failure diagnosis apparatus according to a present Example. It is explanatory drawing which shows the communication node according to a present Example. It is explanatory drawing which shows an example of the data reception time corresponding | compatible table according to a present Example. It is a functional block diagram which shows the communication node according to a present Example. It is a figure for demonstrating the communication interruption between the communication nodes according to a present Example. It is a functional block diagram which shows the monitoring node according to a present Example. It is explanatory drawing which shows the failure diagnosis apparatus according to a present Example. It is explanatory drawing which shows an example of the communication node transmission data correspondence table according to a present Example. It is a functional block diagram which shows the failure diagnosis apparatus according to a present Example. It is a flowchart which shows operation | movement of the communication node according to a present Example. It is a flowchart which shows operation | movement of the communication node according to a present Example. It is a flowchart which shows operation | movement of the monitoring node according to a present Example. It is a flowchart which shows operation | movement of the failure diagnosis apparatus according to a present Example. It is explanatory drawing which shows the communication system and failure diagnosis apparatus according to a present Example.

Next, the form for implementing this invention is demonstrated, referring drawings based on the following Examples.
In all the drawings for explaining the embodiments, the same reference numerals are used for those having the same function, and repeated explanation is omitted.

<Example>
<Communication system>
1 and 2 show an outline of a communication system according to the present embodiment. FIG. 1 is an example of a communication system including a monitoring node. FIG. 2 is an example of a communication system that does not include a monitoring node.

This communication system has a plurality of communication nodes 100 _n (n is an integer of n> 0). The communication system may be mounted on a vehicle.

In the example shown in FIG. 1, a plurality of communication nodes 100 _n are connected via a communication bus 400. Of the plurality of communication nodes 100 _n , at least some of the communication nodes have a function of monitoring communication abnormality. A communication node having a function of monitoring the communication abnormality is referred to as a “monitoring node”. A communication node having a function of monitoring the communication abnormality is “monitoring node 100 ₃ ”. One monitoring node may be included in the communication system, or a plurality of monitoring nodes may be included in the communication system. Here, monitoring means receiving notification of data in which communication abnormality has occurred from at least one of the communication nodes having no function of monitoring communication abnormality. In other words, the monitoring node collects information representing data in which communication abnormality has occurred. For example, the monitoring node receives notification of data in which communication abnormality has occurred from a communication node connected to the communication bus to be monitored by the monitoring node. By monitoring the monitoring node, the communication abnormality of the communication system can be monitored.

  Among communication nodes that do not have a function for monitoring communication abnormality, a communication node that does not notify the monitoring node of data in which communication abnormality has occurred is configured to hold information representing the data in which communication abnormality has occurred. Also good. The communication node may notify information representing data in which the communication abnormality has occurred in accordance with a request from the failure diagnosis apparatus 200.

Also in the example shown in FIG. 2, the plurality of communication nodes 100 _n are connected via the communication bus 400. The plurality of communication nodes 100 _n do not have a function of monitoring communication abnormality. A communication system is configured by the communication node 100 _n that does not have a function of monitoring the communication abnormality. The communication node 100 _n that does not have a function of monitoring communication abnormality holds information representing data in which communication abnormality has occurred. The communication node 100 _n notifies information representing data in which the communication abnormality has occurred in accordance with a request from the failure diagnosis apparatus 200.

  1 and 2 show a data link connector (DLC) 300 and a failure diagnosis apparatus 200. FIG. A DLC 300 is connected to the communication bus 400. The failure diagnosis apparatus 200 is connected to the DLC 300 when failure diagnosis is performed.

Each communication node 100 _n performs communication in accordance with, for example, a communication protocol for in-car LAN. For example, CAN (Controller Area Network) may be applied as a communication protocol for in-car LAN, LIN (Local Interconnect Network) may be applied, or FlexRay is applied. It may be. Other protocols may be applied.

  The topology of the communication protocol is not limited to the bus type shown in FIGS. 1 and 2, but may be a star type. Also, a hybrid type in which a bus type and a star type are combined may be used. In this embodiment, a case where a bus topology is used will be described as an example.

Each communication node 100 _n may be realized by, for example, a plurality of electronic control units (hereinafter referred to as “ECUs”) that control each part of the automobile, or may be realized by sensors, actuators, or the like. Also good. Also, multiple systems may be incorporated into the communication node 100 _n.

  Data is transmitted and received between the communication nodes. The data includes an identifier. The identifier may be in accordance with the type of data. For example, the identifiers included in the frames including the vehicle speed data may be the same.

<Communication node>
The communication node 100 _n detects that data to be received cannot be received. When the communication node 100 _n detects that the data to be received cannot be received, the communication node 100 _n stores the identifier of the data that should have been received but could not be received. Hereinafter, data that should have been received but could not be received is simply referred to as “data that should have been received”. The communication node 100 _n may transmit information representing an identifier of data that should have been received to the monitoring node 100 ₃ . For example, the communication node 100 _n may transmit information representing an identifier of data that should have been received periodically or irregularly. Further, the communication node 100 _n in accordance with a request from the monitoring node 100 _3, may transmit information representing the identity of should have been received data.

The communication node 100 _n does not transmit information indicating the identifier of the data that should have been received by the monitoring node 100 ₃ may be holding information representative of the identifier of the data that should have been the received.

Figure 3 shows the communication node 100 _n. FIG. 3 mainly shows the hardware configuration.

The communication node 100 _n includes a communication module 104 _n . The communication module 104 _n communicates with the communication module of another communication node 100 _n . The said other communication node 100 _n, include monitoring node 100 _3. Further, the communication module 104 _n performs communication with the failure diagnosis apparatus 200 via the DLC 300. For example, communication is performed according to a predetermined communication protocol. As the communication protocol, CAN may be applied, LIN may be applied, or FlexRay may be applied.

The communication node 100 _n includes a storage unit 106 _n . The storage unit 106 _n stores a program for causing the MPU 102 _n to function as the communication node 100 _n . The storage unit 106 _n stores a table (hereinafter referred to as a “data reception time correspondence table”) that indicates correspondence between data to be received by the communication node 100 _n and a time at which the data is to be received. Is done. The data reception time correspondence table may be different for each communication node 100 _n . This is because the data to be received may be different for each communication node 100 _n . For example, it represents a correspondence between an identifier of data to be received by the communication node 100 _n and a time interval (hereinafter referred to as “timeout time”) from when the data is received until it is determined that the next data cannot be received. A table may be prepared. For example, when the CAN is applied, as an identifier of the data to be received by the communication node 100 _n, CAN_ID may be utilized. Moreover, an identification number may be sufficient. Specifically, a time interval at which the next data is to be received may be set after the data is received.

  FIG. 4 shows an example of the data reception time correspondence table.

  In the example shown in FIG. 4, the data reception time correspondence table shows the correspondence between the data identifier and the data timeout time. For example, the time-out time of data represented by the data identifier “AAA” is “αα”, and the time-out time of data represented by the data identifier “AAB” is “ββ”.

Further, when it is detected that the data to be received cannot be received, the storage unit 106 _n stores the identifier of the data that should have been received.

This communication node 100 _n has an MPU 102 _n . Data received by the communication module 104 _n is input to the MPU 102 _n .

The MPU 102 _n waits for data to be received according to the correspondence between the data to be received and the time-out time of the data included in the data reception time correspondence table to be stored in the storage unit 106 _n . The MPU 102 _n determines whether the data to be received is input from the communication module 104 _n . If the data to be received is not received even after the timeout time elapses, the MPU 102 _n determines that a communication interruption has occurred. The MPU 102 _n stores an identifier of data that should have been received. When the data to be received is received, the MPU 102 _n performs processing according to the received data.

The MPU 102 _n generates data identifier notification information including the identifier of the data that should have been stored and stored in the storage unit 106 _n . The MPU 102 _n via the communication module 104 _n, the monitoring node 100 _3, and transmits the data identifier notification information.

The MPU 102 _n , the communication module 104 _n , and the storage unit 106 _n are connected to each other by a bus 50.

<Functions of this communication node>
FIG. 5 shows functions of the communication node 100 _n . FIG. 5 mainly shows functions executed by the MPU 102 _n .

This communication node 100 _n includes a data reception determination unit 1022. The said data reception determining unit 1022, the received data is inputted by the communication module 104 _n. The data reception determining unit 1022, included in the data reception time association table to be stored in the storage unit 106 _n, the data to be received, in accordance with correspondence between the timeout time of the data, waits for data to be received. The data reception determining unit 1022, the communication module 104 _n, determines whether the data to be the received is input. For example, the data reception determination unit 1022 may detect an identifier of input data and determine whether the identifier matches an identifier of data to be received. In this case, if they match, it is determined that the data to be received has been input, and if they do not match, it is determined that the data to be received has not been input.

FIG. 6 shows a part of the communication system shown in FIG. 1 and FIG. The communication node 100 ₂ includes a data reception time corresponding table shown in FIG.

The communication node 100 ₂ determines, according to the data reception time association table, whether the data of the identifier data represented by "AAA" is received within the timeout period "αα". The communication node 100 ₂ determines whether the data which the data of the identifier (identification number) is represented by "AAB" is received within the timeout period "ββ".

The communication node 100 ₁ transmits data whose data identifier is represented by “AAB” to the communication node 100 ₂ . However, for some reason, the data identifier of the data is represented by "AAB" is not received by the communication node 100 _2. For example, the communication node 100 _1, it is assumed that the communication bus 400 which connects the communication node 100 ₂ is disconnected. Moreover, also contemplated when the communication module 104 _n itself of the communication node 100 ₁ can not transmit data has failed.

Table communication node 100 ₂ in accordance with the time-out period "ββ" waits for data data identifier is represented by "AAB", but has elapsed the timeout time "ββ" is data identifier by "AAB" If the received data cannot be received, it is determined that communication interruption has occurred. For example, if the data cannot be received even after the timeout time has elapsed since the last transmitted data was received, it may be determined that a communication interruption has occurred. The communication node 100 _2, when the communication interrupted is determined to have occurred, and stores the identifier of the should have been received data. For example, the data reception determination unit 1022 determines that communication interruption has occurred because the data whose data identifier is represented by “AAB” cannot be received even after the timeout time “ββ” elapses. The data reception determination unit 1022 stores the identifier “AAB” of the data that could not be received in the storage unit 106 _n .

  On the other hand, when the data to be received is input, the data reception determination unit 1022 inputs the data to the data processing unit 1024.

The communication node 100 _n includes a data processing unit 1024. The data processing unit 1024 is connected to the data reception determination unit 1022. The data processing unit 1024 performs a predetermined process according to the data to be input by the data reception determination unit 1022.

The communication node 100 _n includes a data identifier notification information generation unit 1026. The data identifier notification information generation unit 1026 generates data identifier notification information including an identifier of data that should have been received and stored in the storage unit 106 _n .

The data identifier notification information generating unit 1026, via the communication module 104 _n, the monitoring node 100 _3, and transmits the data identifier notification information. For example, the data identifier notification information generation unit 1026 may generate and transmit data identifier notification information periodically or irregularly. The data identifier notification information generating unit 1026, in accordance with a request from the monitoring node 100 _3, generates a data identifier notification information, may be transmitted.

The data identifier notification information generating unit 1026, via the communication module 104 _n, the failure diagnosis device 200, may transmit the data identifier notification information. For example, the data identifier notification information generation unit 1026 may transmit the data identifier notification information in accordance with a request from the failure diagnosis apparatus 200.

<Monitoring node>
Monitoring node 100 ₃ receives the data identifier notification information from the communication node 100 _n. The monitoring node 100 ₃ stores an identifier of the data contained in the data identifier notification information.

The monitoring node 100 _3, may have a function as a communication node. If the monitoring node 100 ₃ has a function as a communication node, the monitoring node 100 ₃ detects that it can not receive the data to be received. When the monitoring node detects that the data to be received cannot be received, the monitoring node stores the identifier of the data that should have been received.

Hardware configuration of the monitoring node 100 ₃ is substantially the same as FIG.

Communication module ₁₀₄₃ performs a communication module of another communication node 100 _n, a communication. For example, communication is performed according to a predetermined communication protocol. As the communication protocol, CAN may be applied, LIN may be applied, or FlexRay may be applied. The communication module ₁₀₄₃ includes a communication module of another monitoring node may perform communication. In this case, an identifier of data that should have been received may be communicated with other monitoring nodes.

The storage unit 106 ₃ stores a program for causing the MPU 102 ₃ to function as the monitoring node 100 ₃ . The storage unit 106 _3, the identifier of the data to be included in the notification data identifier notification information by the communication node 100 _n are stored.

The storage unit 106 _3, a data reception time association table is stored. For example, the identifier of the data to be received by the monitoring node 100 _3, table representing the correspondence between the timeout time corresponding to the data may be provided. Specifically, a time interval at which the next data is to be received may be set after the data is received.

The data reception time correspondence table is substantially the same as that shown in FIG. However, the data identifier may include the identifier of the data to be received by the monitoring node 100 _3. As the timeout time, a timeout time corresponding to the data is set. When there are a plurality of monitoring nodes, the data reception time correspondence table may be different for each monitoring node. This is because the data to be received may be different for each monitoring node.

The storage unit 106 ₃ stores an identifier of data that should have been received by the monitoring node 100 ₃ .

The MPU 102 ₃ receives data received by the communication module 104 ₃ .

The MPU 102 ₃ acquires the data identifier from the other communication node 100 _n . For example, an identifier of data included in the data identifier notification information that should be notified regularly or irregularly by another communication node 100 _n may be acquired. Further, when the data identifier is acquired from another communication node 100 _n , the communication node 100 _n may be requested to notify the data identifier. The MPU 102 ₃ stores the identifier of the data notified by the other communication node 100 _n in the storage unit 106 ₃ .

Further, the MPU 102 ₃ are included in the data reception time association table to be stored in the storage unit 106 _3, a data to be received, in accordance with correspondence between the timeout time of the data, waits for data to be received. The MPU 102 ₃ determines whether or not the data to be received is input from the communication module 104 ₃ . The MPU 102 _3, even after the lapse of the timeout period, if the data to be received is not received, it is determined that communication interrupted occurs. The MPU 102 ₃ stores an identifier of data that could not be received. The MPU 102 _3, when data to be received has been received, performs processing in accordance with the received data.

The MPU 102 ₃ includes data identifier notification information including the identifier of data notified by the other communication node 100 _n stored in the storage unit 106 ₃ and the identifier of data that should have been received by the monitoring node 100 _3. Is generated. The MPU 102 ₃ transmits data identifier notification information to the failure diagnosis apparatus 200 via the communication module 104 ₃ .

<Function of this monitoring node>
Figure 7 illustrates the functions of the monitoring node 100 _3. Figure 7 is mainly function performed by the MPU 102 ₃ is shown.

This monitoring node 100 ₃ includes a data reception determining unit 1022. The said data reception determining unit 1022, the received data is inputted by the communication module 104 _3. The data reception determining unit 1022, included in the data reception time association table to be stored in the storage unit 106 _3, a data to be received, in accordance with correspondence between the timeout time of the data, waits for data to be received. The data reception determination unit 1022 determines from the communication module 104 _3, whether data to be received is input. For example, the data reception determination unit 1022 may detect an identifier of input data and determine whether the identifier matches an identifier of data to be received. In this case, if they match, it is determined that the data to be received has been input, and if they do not match, it is determined that the data to be received has not been input. If the data to be the received is not input, the data reception determining unit 1022, the storage unit 106 _3, and inputs the identifier of the should have been received data.

  When data to be received is input, the data reception determination unit 1022 inputs the data to the data processing unit 1024.

This monitoring node 100 ₃ includes a data processing unit 1024. The data processing unit 1024 is connected to the data reception determination unit 1022. The data processing unit 1024 performs a predetermined process according to the data to be input by the data reception determination unit 1022.

This monitoring node 100 ₃ includes a data identifier acquiring unit 1028. The data identifier acquiring unit 1028 acquires an identifier of the data contained in the data identifier notification information from the communication node 100 _n to be received by the communication module 104 _3. Data identifier acquiring unit 1028, the storage unit 106 _3, and stores the identifier of the data.

This monitoring node 100 ₃ includes a data identifier notification information generating unit 1026. The data identifier notification information generating unit 1026 to be stored in the storage unit 106 _3, generates a data identifier notification information including an identifier of should have been received data. The identifier of the data that should have been received may be a communication node, a monitoring node, or a communication node and a monitoring node. The data identifier notification information generating unit 1026, via the communication module 104 _3, the fault diagnosis apparatus 200, transmits the data identifier notification information. For example, the data identifier notification information generation unit 1026 may generate and transmit data identifier notification information in accordance with a request from the failure diagnosis apparatus 200.

<Fault diagnosis device>
FIG. 8 shows an example of the failure diagnosis apparatus 200. FIG. 8 mainly shows a hardware configuration.

  The failure diagnosis apparatus 200 is connected to the communication system via the data link connector 300. The failure diagnosis apparatus 200 may be configured by a failure diagnosis tool outside the vehicle. The diagnostic tool may include a diagnostic tool.

The fault diagnosis apparatus 200 has an interface (I / F) 202. The interface 202 is connected to the data link connector 300. The interface 202 receives data identifier notification information to be transmitted from the monitoring node 100 ₃ or the communication node 100 _n . The interface 202 inputs data identifier notification information from the monitoring node 100 ₃ or the communication node 100 _n to the MPU 204.

The fault diagnosis apparatus 200 has a storage unit 206. The storage unit 206 includes a table (hereinafter referred to as “communication node transmission data correspondence table”) that indicates correspondence between the communication node 100 _n and the identifier of data to be transmitted by the communication node 100 _n . Here, the communication node 100 _n includes a monitoring node as a communication node.

FIG. 9 shows an example of the communication node transmission data correspondence table. According to the communication node transmission data correspondence table shown in FIG. 9, the data identifier is associated with the information representing the communication node that transmits the data. For example, the communication node 100 ₃ transmits the data to data of the identifier is represented by "AAA". Further, for example, the communication node 100 ₁ sends data data identifier is represented by "AAB".

  The fault diagnosis apparatus 200 has an MPU 204. Based on the identifier of the data input by the interface 202, the MPU 204 specifies a communication node that should transmit data corresponding to the identifier. For example, the MPU 204 refers to the communication node transmission data correspondence table and identifies the communication node corresponding to the identifier of the data input by the interface 202. The MPU 204 outputs information indicating the specified communication node. For example, it may be output to a display device (not shown).

  The interface 202, the MPU 204, and the storage unit 206 are connected to each other via a bus 250.

<Functions of the fault diagnosis device>
FIG. 10 shows functions of the fault diagnosis apparatus 200. FIG. 10 mainly shows functions executed by the MPU 204.

The fault diagnosis apparatus 200 includes a data identifier acquisition unit 2042. Data identifier notification information is input from the interface 202 to the data identifier acquisition unit 2042. The data identifier acquisition unit 2042 acquires an identifier of data included in the data identifier notification information from the interface 202. The data identifier acquisition unit 2042 inputs the data identifier acquired from the data identifier notification information to the communication node identification unit 2044. For example, the data identifier acquisition unit 2042 may request data identifier notification information from the communication node 100 _n or the monitoring node 100 ₃ . You may make it acquire the identifier of the data contained in the data identifier notification information notified as a response signal with respect to the request | requirement of this data identifier notification information.

  The fault diagnosis apparatus 200 includes a communication node specifying unit 2044. The communication node identification unit 2044 is connected to the data identifier acquisition unit 2042. The communication node specifying unit 2044 specifies a communication node corresponding to the identifier of the data input from the data identifier acquiring unit 2042 with reference to the communication node transmission data correspondence table to be stored in the storage unit 206. For example, the communication node corresponding to the identifier of the data is specified by searching the identifier of the data input from the data identifier acquisition unit 2042 from the communication node transmission data correspondence table. The communication node specifying unit 2044 inputs information representing the specified communication node to the output unit 2046. When there are a plurality of identified communication nodes, information representing the plurality of communication nodes is input to the output unit 2046.

  The fault diagnosis apparatus 200 includes an output unit 2046. The output unit 2046 receives information representing a communication node from the communication node specifying unit 2044. The output unit 2046 outputs information representing a communication node to be input by the communication node specifying unit 2044. For example, it may be output to a display device (not shown) or may be output by voice. Further, for example, the data may be output to another device different from the failure diagnosis device 200. The other device may include a PC. By outputting information representing the communication node, the user can recognize a communication node that is assumed to have lost communication.

<Operation of communication system>
In this embodiment, in a communication system shown in FIG. 1, and FIG. 2, the processing by the communication node 100 _n, the processing by the monitoring node 100 _3, will be separately described processing by the fault diagnosis apparatus 200.

<Processing by communication node>
FIG. 11 is a flowchart showing processing by the communication node 100 _n . FIG. 11 shows the operation of the communication node 100 _n that notifies the monitoring node of the data identifier notification information.

This communication node 100 _n determines whether or not there is a communication abnormality (step S1102). For example, the data reception determination unit 1022 determines whether data to be received has been received. The data reception determination unit 1022 determines that a communication error has occurred when data to be received is not received. For example, the data reception determination unit 1022 determines whether a communication abnormality has occurred.

If it is determined that the communication abnormality (step S1102: YES), the communication node 100 _n stores the identifier of should have been received data (step S1104). For example, the data reception determination unit 1022 stores the identifier of the data that should have been received in the storage unit 106 _n .

On the other hand, if not determined to be communication anomaly (step S1102: NO), and when the process of step S1104 has been performed, the communication node 100 _n includes the monitoring node 100 _3, whether to notify the data identifier Determination is made (step S1106). For example, data identifier notification information generating unit 1026 determines the monitoring node 100 _3, whether to notify the data identifier. For example, it may be determined whether it has been requested by the monitoring node 100 _3, the data identifier notification information generating unit 1026 may determine whether to send regularly or irregularly.

If it is determined not to notify the data identifier to the monitoring node 100 ₃ (step S1106: NO), the flow returns to step S1102.

On the other hand, when it is determined to notify the data identifier to the monitoring node 100 ₃ (step S1106: YES), the communication node 100 _n generates data identifier notification information (step S1108). For example, the data identifier notification information generation unit 1026 generates data identifier notification information including an identifier of data stored in the storage unit 106 _n .

The communication node 100 _n includes the monitoring node 100 ₃ notifies the data identifier notification information (step S1110). For example, data identifier notification information generated by the data identifier notification information generating unit 1026, via the communication module 104 _n, is notified to the monitoring node 100 _3.

FIG. 12 is a flowchart showing processing by the communication node 100 _n . FIG. 12 shows the operation of the communication node 100 _n that does not notify the monitoring node of the data identifier notification information. The communication node 100 _n notifies the data identifier notification information in response to a request from the failure diagnosis apparatus 200.

The communication node 100 _n determines whether or not there is a communication abnormality (step S1202). For example, the data reception determination unit 1022 determines whether data to be received has been received. The data reception determination unit 1022 determines that a communication error has occurred when data to be received is not received. For example, the data reception determination unit 1022 determines whether a communication abnormality has occurred.

If it is determined that the communication abnormality (step S1202: YES), the communication node 100 _n stores the identifier of should have been received data (step S1204). For example, the data reception determination unit 1022 stores the identifier of the data that should have been received in the storage unit 106 _n .

On the other hand, if not determined to be communication anomaly (step S1202: NO), and when the process of step S1204 has been performed, the communication node 100 _n includes a fault diagnosis apparatus 200, whether to notify the data identifier Determination is made (step S1206). For example, the data identifier notification information generation unit 1026 determines whether to notify the failure diagnosis apparatus 200 of the data identifier. For example, it may be determined whether or not to notify by determining whether or not a data identifier is requested by the failure diagnosis apparatus 200. Further, when it is recognized that the failure diagnosis apparatus 200 is connected to the communication system, it may be determined whether to notify the data identifier. When it is recognized that the failure diagnosis apparatus 200 is connected to the communication system, it may be determined that the data identifier is automatically notified.

  If it is determined not to notify the failure diagnosis apparatus 200 of the data identifier (step S1206: NO), the process returns to step S1202.

On the other hand, if it is determined in the fault diagnosis apparatus 200 and notifies the data identifier (step S1206: YES), the communication node 100 _n generates data identifier notification information (step S1208). For example, data identifier notification information generating unit 1026 generates a data identifier notification information including an identifier of the data stored in the storage unit 106 _3.

The communication node 100 _n notifies the failure diagnosis apparatus 200 of the data identifier notification information (step S1210). For example, data identifier notification information generated by the data identifier notification information generating unit 1026, via the communication module 104 ₃ is notified to the fault diagnosis apparatus 200.

<Processing by monitoring node>
Figure 13 is a flowchart showing processing by the monitoring node 100 _3.

This monitoring node 100 _3, from the communication node 100 _n, receives the data identifier notification information (step S1302). For example, data identifier notification information from the communication node 100 _n is received by the communication module 104 _3, is input to the data identifier acquiring unit 1028.

This monitoring node 100 ₃ stores the data of the identifier (step S1304). For example, the data identifier obtaining unit 1028, the storage unit 106 _3, and inputs the identifier of the data to be included in the data identifier notification information.

If the monitoring node 100 ₃ has a function as a communication node, also in accordance with step S1102, S1104 of the flowchart shown in FIG. 11 at the monitoring nodes 100 _3, identifier should have been received data is acquired, the storage unit 106 ₃ may be stored.

This monitoring node 100 _3, the fault diagnosis apparatus 200 determines whether to notify the data identifier (step S1306). For example, the data identifier notification information generation unit 1026 determines whether to notify the failure diagnosis apparatus 200 of the data identifier. For example, it may be determined whether or not to notify by determining whether or not a data identifier is requested by the failure diagnosis apparatus 200. Further, when it is recognized that the failure diagnosis apparatus 200 is connected to the communication system, it may be determined whether to notify the data identifier. When it is recognized that the failure diagnosis apparatus 200 is connected to the communication system, it may be determined that the data identifier is automatically notified.

  When it is determined not to notify the failure diagnosis apparatus 200 of the data identifier (step S1306: NO), the process returns to step S1302.

On the other hand, when it is determined to notify an identifier of the data to the fault diagnosis apparatus 200 (Step S1306: YES), the monitoring node 100 ₃ generates a data identifier notification information (step S1308). For example, data identifier notification information generating unit 1026 generates a data identifier notification information including an identifier of the data stored in the storage unit 106 _3. The identifier of the data may be a communication node, a monitoring node, or a communication node and a monitoring node.

This monitoring node 100 _3, the fault diagnosis apparatus 200 notifies the data identifier notification information (step S1310). For example, data identifier notification information generated by the data identifier notification information generating unit 1026, via the communication module 104 ₃ is notified to the fault diagnosis apparatus 200.

<Processing by failure diagnosis device>
FIG. 14 is a flowchart illustrating processing performed by the failure diagnosis apparatus 200.

This failure diagnosis device 200, the monitoring node 100 _3, requests the data identifier (step S1402). For example, the data identifier obtaining unit 2042, the monitoring node 100 _3, requests the data identifier. When it is recognized that the failure diagnosis apparatus 200 is connected to the communication system, this process may not be performed when the data identifier is automatically notified.

This failure diagnosis device 200, the monitoring node 100 ₃ acquires data identifier notification information (step S1404). For example, the data identifier acquisition unit 2042 acquires data identifier notification information via the interface 202. The data identifier acquisition unit 2042 acquires the identifier of data included in the data identifier notification information.

  The fault diagnosis apparatus 200 identifies a communication node corresponding to the data identifier (step S1406). For example, the communication node identification unit 2044 refers to the communication node transmission data correspondence table to be stored in the storage unit 206, and identifies the communication node corresponding to the data identifier included in the data identifier notification information acquired in step S1404. To do.

  The fault diagnosis apparatus 200 outputs information representing the communication node specified in step S1406 (step S1408). For example, the output unit 2046 outputs information representing a communication node to be input by the communication node specifying unit 2044. The output information indicating the communication node may be displayed on a display device or may be output to an external device such as a PC. For example, the output communication node is determined as a communication node in which communication interruption has occurred, and can be used for failure diagnosis.

  In the above-described embodiment, the monitoring node may not have a function as a communication node. Since the monitoring node does not have a function as a communication node, the processing load on the monitoring node can be reduced. In this case, in the configuration of the monitoring node described with reference to FIG. 7, the data reception determination unit 1022 and the data processing unit 1024 are omitted.

  According to the present embodiment, a table representing correspondence between a communication node and an identifier of data to be transmitted by the communication node is stored in the failure diagnosis apparatus as an external device. The out-of-vehicle device searches the table based on the identifier of the data that should have been received, which should be notified from the monitoring node, and identifies the communication node corresponding to the identifier of the data. The out-of-vehicle device outputs information representing the specified communication node.

  Since the table representing the correspondence between the communication node and the identifier of the data to be transmitted by the communication node is stored in the out-of-vehicle device, even if the identifier of the data to be transmitted by the communication node is changed, the out-of-vehicle device This can be dealt with by changing the table to be stored.

  Further, since it is not necessary to store the table in the monitoring node, the storage capacity required for the monitoring node can be reduced.

<Modification>
<Communication system>
FIG. 15 shows an outline of a communication system according to this modification. FIG. 15 is an example of a communication system including a monitoring node.

This communication system has a plurality of communication nodes 100 _n (n is an integer of n> 0).

In the example shown in FIG. 15, communication node 100 ₁ -communication node 100 ₃ are connected to monitoring node 100 ₄ via communication bus 400 ₁ . Further, a plurality of communication nodes 100 ₃ - and the communication node 100 _6, the monitoring node 100 ₄ via the communication bus 400 ₂ is connected to the DLC300. The DLC 300 is connected to the failure diagnosis apparatus 200.

Each of the communication nodes 100 _{1 to} 100 ₃ is set to transmit one or more data to the monitoring node 100 ₄ .

<Monitoring node>
Monitoring node 100 _4, the communication node 100 ₁ - detecting that can not receive the data to be received from the communication node 100 _3. The monitoring node 100 _4, when it is detected that can not receive the data to be received, and stores the identifier of the data that should have been the received. The monitoring node 100 _4, the fault diagnosis apparatus 200 transmits the information representing the identity of should have been received data. For example, the monitoring node 100 _4, periodically or irregularly, may be transmitted information representing the identity of should have been received data. The monitoring nodes 100 _4, according to a request from the failure diagnosis device 200, may be transmitted information representing the identity of should have been received data.

The hardware configuration of the monitoring node 100 ₄ is substantially the same as the hardware configuration of the communication node 100 _n shown in FIG.

<Function of this monitoring node>
Function of the monitoring node 100 ₄ is substantially the same as the functional block diagram shown in FIG.

<Processing by monitoring node>
Function of the monitoring node 100 ₄ is substantially the same as the processing by the communication node 100 _n shown in FIG. 12.

  The following items are disclosed with respect to the above-described embodiments and modifications.

(1) A communication interruption determination system for determining communication interruption between communication nodes,
The first communication node is
A first data reception determination unit that determines whether data to be received from another communication node is received;
A first storage unit that stores information representing data that is not received when the first data reception determination unit determines that the data to be received is not received;
A failure diagnosis apparatus, a data identifier notification information generation unit for notifying information indicating data not received stored in the first storage unit, and a first notification unit as a communication module;
The fault diagnosis apparatus is
A first table as a communication node transmission data correspondence table representing correspondence between information representing data and a communication node to which the data is to be transmitted;
A communication node identifying unit that identifies another communication node corresponding to information representing data notified by the first communication node based on the first table;
And an output unit that outputs information representing another communication node specified by the communication node specifying unit.

(2) In the communication interruption determination system described in (1),
The first communication node is
A first table as a data reception time correspondence table representing correspondence between data to be received by the first communication node and information representing a time at which the data is to be received;
The first data reception determination unit determines whether data to be received has been received from the other communication node according to the first table.

(3) In the communication interruption determination system according to (2),
The time at which the data to be represented by the first table is to be received represents the time interval from when the data is received until the next predetermined data is received, which should be set for each data. It is a timeout time.

(4) In the communication interruption determination system according to any one of (1) to (3),
The first storage unit stores an identifier included in the data as information representing the data not received.

(5) In the communication interruption determination system according to any one of (1) to (4),
The second communication node is
A second receiving unit that receives information representing data determined not to be received by the third communication node from the third communication node;
A second storage unit for storing information representing data determined not to be received by the third communication node received by the second reception unit;
A second notification unit for notifying the failure diagnosis apparatus of information representing unreceived data stored in the second storage unit.

(6) In the communication interruption determination system according to (5),
The third communication node is
A third data reception determination unit that determines whether data to be received from another communication node is received;
A third storage unit that stores information representing the data that is not received when the third data reception determination unit determines that the data to be received is not received;
A third notification unit configured to notify the second communication node of information representing unreceived data stored in the third storage unit.

(7) In the communication interruption determination system according to (6),
The third communication node is
A third table representing correspondence between data to be received by the third communication node and information representing a time at which the data is to be received;
The third data reception determination unit determines whether data to be received has been received from the other communication node according to the second table.

(8) In the communication interruption determination system according to (7),
The time at which the data to be represented in the third table is to be received is the time interval from when the data is received until the next predetermined data is received. It is the timeout time to represent.

(9) One communication node in a communication system having a plurality of communication nodes,
A data reception determination unit that determines whether data to be received from another communication node is received;
A storage unit that stores information representing data that is not received when the data reception determination unit determines that the data to be received is not received;
A notifying unit for notifying the failure diagnosis apparatus of information representing unreceived data stored in the storage unit.

(10) One communication node as a monitoring node in a communication system having a plurality of communication nodes,
A receiving unit that receives information representing data determined not to be received by the other communication node from another communication node;
A storage unit for storing information representing data determined not to be received by the other communication node received by the receiving unit;
A notification unit for notifying the failure diagnosis apparatus of information representing unreceived data stored in the storage unit.

(11) In the communication node according to (10),
A data reception determination unit for determining whether data to be received from another communication node has been received,
The storage unit stores information representing data not received when it is determined by the data reception determination unit that data to be received is not received,
The notification unit notifies the failure diagnosis apparatus of information representing unreceived data stored in the storage unit.

(12) A communication interruption determination method in a communication interruption determination system for determining communication interruption between communication nodes,
The communication node is
A data reception determination step for determining whether or not data to be received from another communication node has been received;
A storage step of storing information representing the data that is not received when it is determined that the data to be received is not received in the data reception determination step;
A notification step of notifying the failure diagnosis apparatus of information representing the unreceived data stored by the storage step;
The fault diagnosis apparatus is
A communication node specifying step of specifying another communication node corresponding to the information indicating the data notified by the communication node, based on a table indicating the correspondence between the information indicating the data and the communication node to which the data is to be transmitted; ,
An output step of outputting information representing another communication node specified by the communication node specifying step.

  For convenience of explanation, specific numerical examples will be described to facilitate understanding of the invention. However, unless otherwise specified, these numerical values are merely examples, and any appropriate value may be used.

  Although the present invention has been described above with reference to specific embodiments, each embodiment is merely an example, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, and the like. I will. For convenience of explanation, an apparatus according to an embodiment of the present invention has been described using a functional block diagram, but such an apparatus may be realized by hardware, software, or a combination thereof. The present invention is not limited to the above-described embodiments, and various variations, modifications, alternatives, substitutions, and the like are included without departing from the spirit of the present invention.

50 Bus 100 _n (n is an integer of n> 0) Communication node 100 ₃ Monitoring node 102 _n MPU (Micro-Processing Unit)
1022 Data Reception Determination Unit 1024 Data Processing Unit 1026 Data Identifier Notification Information Generation Unit 1028 Data Identifier Acquisition Unit 104 _n Communication Module 106 _n Storage Unit 200 Fault Diagnosis Device 202 Interface 204 MPU (Micro-Processing Unit)
2042 Data identifier acquisition unit 2044 Communication node specification unit 2046 Output unit 206 Storage unit 250 Bus 300 Data link connector 400 Communication bus

Claims (12)

A communication interruption determination system for determining communication interruption between communication nodes,
The first communication node is
A first data reception determination unit that determines whether data to be received from another communication node is received;
A first storage unit that stores information representing data that is not received when the first data reception determination unit determines that the data to be received is not received;
A first diagnostic unit for notifying the failure diagnosis apparatus of information representing unreceived data stored in the first storage unit;
The fault diagnosis apparatus is
A first table representing correspondence between information representing data and a communication node to which the data is to be transmitted;
A communication node identifying unit that identifies another communication node corresponding to information representing data notified by the first communication node based on the first table;
A communication disruption determination system comprising: an output unit that outputs information representing another communication node identified by the communication node identification unit. In the communication interruption determination system according to claim 2,
The first communication node is
A first table representing correspondence between data to be received by the first communication node and information representing a time at which the data is to be received;
The first data reception determination unit is a communication interruption determination system that determines whether data to be received has been received from the other communication node according to the first table. In the communication interruption determination system according to claim 2,
The time at which the data to be represented by the first table is to be received represents the time interval from when the data is received until the next predetermined data is received, which should be set for each data. Communication interruption judgment system that is timeout time. In the communication interruption determination system according to any one of claims 1 to 3,
The communication failure determination system, wherein the first storage unit stores an identifier included in the data as information representing the data not received. In the communication interruption determination system according to any one of claims 1 to 4,
The second communication node is
A second receiving unit that receives information representing data determined not to be received by the third communication node from the third communication node;
A second storage unit for storing information representing data determined not to be received by the third communication node received by the second reception unit;
A communication interruption determination system, comprising: a second notification unit that notifies the failure diagnosis device of information representing unreceived data stored in the second storage unit. In the communication interruption determination system according to claim 5,
The third communication node is
A third data reception determination unit that determines whether data to be received from another communication node is received;
A third storage unit that stores information representing the data that is not received when the third data reception determination unit determines that the data to be received is not received;
A communication disruption determination system, comprising: a third notification unit that notifies the second communication node of information representing unreceived data stored in the third storage unit. In the communication interruption determination system according to claim 6,
The third communication node is
A third table representing correspondence between data to be received by the third communication node and information representing a time at which the data is to be received;
The communication interruption determination system, wherein the third data reception determination unit determines whether data to be received has been received from the other communication node according to the second table. In the communication interruption determination system according to claim 7,
The time at which the data to be represented in the third table is to be received is the time interval from when the data is received until the next predetermined data is received. Communication interruption determination system, which is a timeout time. A communication node in a communication system having a plurality of communication nodes,
A data reception determination unit that determines whether data to be received from another communication node is received;
A storage unit that stores information representing data that is not received when the data reception determination unit determines that the data to be received is not received;
A communication node, comprising: a notification unit that notifies the failure diagnosis apparatus of information representing unreceived data stored in the storage unit. A communication node in a communication system having a plurality of communication nodes,
A receiving unit that receives information representing data determined not to be received by the other communication node from another communication node;
A storage unit for storing information representing data determined not to be received by the other communication node received by the receiving unit;
A communication node, comprising: a notification unit that notifies the failure diagnosis apparatus of information representing unreceived data stored in the storage unit. The communication node according to claim 10, wherein
A data reception determination unit for determining whether data to be received from another communication node has been received,
The storage unit stores information representing data not received when it is determined by the data reception determination unit that data to be received is not received,
The said notification part is a communication node which notifies the information showing the data which are not received memorize | stored in the said memory | storage part to the said failure diagnosis apparatus. A communication interruption determination method in a communication interruption determination system for determining communication interruption between communication nodes,
The communication node is
A data reception determination step for determining whether or not data to be received from another communication node has been received;
A storage step of storing information representing the data that is not received when it is determined that the data to be received is not received in the data reception determination step;
A notification step of notifying the failure diagnosis apparatus of information representing the unreceived data stored by the storage step;
The fault diagnosis apparatus is
A communication node specifying step of specifying another communication node corresponding to the information indicating the data notified by the communication node, based on a table indicating the correspondence between the information indicating the data and the communication node to which the data is to be transmitted; ,
An output step of outputting information representing another communication node specified by the communication node specifying step.

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