JP5696685B2 - In-vehicle communication system, communication abnormality monitoring method for in-vehicle communication system, and communication abnormality monitoring program for in-vehicle communication system - Google Patents

Description

  The present invention relates to an in-vehicle communication system mounted on a vehicle, a communication abnormality monitoring method thereof, and a program.

  2. Description of the Related Art Conventionally, a plurality of information processing apparatuses are mounted on a vehicle, and each performs control of on-vehicle equipment, various arithmetic processes, and the like. Such an information processing apparatus is connected to a network such as a multiplex communication line and outputs information that can be referred to by each information processing apparatus to the network. For example, an information processing device that outputs a vehicle speed signal does not transmit a vehicle speed signal to each information processing device that uses the vehicle speed signal through a dedicated line, but outputs a vehicle speed signal to the network, thereby connecting a plurality of information connected to the network. The vehicle speed signal is provided to the information processing apparatus.

  As described above, the network in the in-vehicle communication system has an important role. Therefore, it is highly necessary to confirm whether or not the network is in a normal state.

  Patent Document 1 describes a network system configured by interconnecting in-vehicle networks with a plurality of relay devices. Communication intervals in this network system are set for each transmission ID (frame type). Then, the relay device has an elapsed timer indicating the elapsed time from the last relay for each relay ID, and when the reception of the relay frame, which is a kind of communication frame, has not been performed beyond the interruption determination threshold, It is determined that the relay frame has been interrupted.

JP2011-101115A

  However, in the conventional network system described above, a monitoring load is large because a message in which various communication intervals are set is monitored.

  An object of the present invention, according to one aspect, is to provide an in-vehicle communication system that can reduce the monitoring load of a monitoring unit that monitors the state of a network.

In order to achieve the above object, the first aspect of the present invention provides:
An in-vehicle communication system mounted on a vehicle,
A plurality of information processing means connected to a network constituted by a communication line and a relay device , and periodically outputting data to the network;
Of the data that is output to periodically the network by each of said plurality of information processing means, to determine the data that is output in the shortest period by each of said plurality of information processing means, wherein the data that is output by the outermost short period Monitoring means for detecting a communication abnormality of the in-vehicle communication system by selectively monitoring whether it is output to the network;
Equipped with a,
The monitoring means has a function of narrowing down the places where the communication abnormality has occurred, narrows down the places where the communication abnormality has occurred regarding the communication line, and then narrows down the places where the communication abnormality has occurred regarding the relay apparatus. ,
It is an in-vehicle communication system.

  According to the first aspect of the present invention, among the data that each information processing means periodically outputs to the network, the data that each information processing means outputs in the shortest cycle is determined, and the data that is output in the shortest cycle is Since it is monitored whether or not it has been output to the network, the monitoring load of the monitoring means for monitoring the state of the network can be reduced.

In the first aspect of the present invention,
Said monitoring means includes identification information of the data included in the data that will be output to periodically the network by each of said plurality of information processing means, the table data associating the period in which the data is output to the network has, by referring to the table data, the data that is output by the shortest period may determine different by each of the plurality of information processing means.

In the first aspect of the present invention,
It said monitoring means, for each of the plurality of information processing means, to record the number of times that the communication error has occurred, may force out the data including the communication error occurrence frequency of each of the plurality of information processing means and the recording .

In the first aspect of the present invention,
Said monitoring means, for each of the plurality of information processing means, to record data about the period in which the communication abnormality continues, Outputs data, including data relating to communication abnormality duration of each of the plurality of information processing means and the recording it may be.

In the first aspect of the present invention,
Said monitoring means, in each period in which the communication abnormality continues, the records the number of times that communication abnormality has occurred, may force out the data including the communication error occurrence count for each communication abnormality duration that the recording.

In the first aspect of the present invention ,
Before Symbol monitoring means during said shortest period longer than the set is a predetermined period corresponding to one information processing means included in said plurality of information processing means, is output in the shortest period by the one information processing means The communication abnormality may be detected when data is not output to the network .

The second aspect of the present invention is:
A communication abnormality monitoring method for an in-vehicle communication system comprising a plurality of information processing means connected to an in-vehicle network constituted by a communication line and a relay device and periodically outputting data to the in- vehicle network,
The monitoring device that the in-vehicle communication system has,
Of the data that is output to periodically the vehicle network by each of said plurality of information processing means, to determine the data that is output in the shortest period by each of said plurality of information processing means,
By data that is output by the discriminated shortest period is selectively monitors whether or not output to the vehicle network, thereby detecting the communication abnormality of the vehicle communication system,
Narrow down the occurrence of the communication abnormality related to the communication line,
Next, narrowing down the occurrence of the communication abnormality related to the relay device ,
It is the communication abnormality monitoring method of a vehicle-mounted communication system.

  According to the second aspect of the present invention, among the data that each information processing means periodically outputs to the network, the data that each information processing means outputs in the shortest cycle is determined, and the data that is output in the shortest cycle is Since it is monitored whether or not it has been output to the network, the monitoring load of the monitoring means for monitoring the state of the network can be reduced.

The third aspect of the present invention is:
A communication abnormality monitoring program for an in-vehicle communication system that is connected to an in-vehicle network constituted by a communication line and a relay device and includes a plurality of information processing means for periodically outputting data to the in- vehicle network,
In the monitoring device that the in-vehicle communication system has,
Of the data that is output to periodically the vehicle network by each of said plurality of information processing means, to determine the data that is output in the shortest period by each of said plurality of information processing means,
The Rukoto selectively to monitor whether the discriminated data in the shortest period Ru output was is output to the onboard network, it causes detects the communication abnormality of the vehicle communication system,
Let us narrow down the location of the communication abnormality related to the communication line,
Next, the occurrence of the communication abnormality related to the relay device is narrowed down .
This is a communication abnormality monitoring program for an in-vehicle communication system.

  According to the third aspect of the present invention, out of the data that each information processing means periodically outputs to the network, the data that each information processing means outputs in the shortest cycle is determined, and the data that is output in the shortest cycle is Since it is monitored whether or not it has been output to the network, the monitoring load of the monitoring means for monitoring the state of the network can be reduced.

  According to one aspect of the present invention, it is possible to provide an in-vehicle communication system capable of reducing a monitoring load of a monitoring unit that monitors a state of a network.

1 is a system configuration example of an in-vehicle communication system 1 according to an embodiment of the present invention. It is a data format example of the message which each ECU outputs to a bus | bath. 4 is an example of data held as a period table 44. It is an example of the flowchart which shows the flow of the network monitoring process which gateway ECU40 performs. 4 is an example of data stored as communication interruption information 46. It is a timing chart which shows various data changes at the time of network monitoring being performed by gateway ECU40. It is an example of the flowchart which shows the flow of the communication location specific process which gateway ECU40 performs. It is an example of the data stored as connection information. It is a figure which shows typically a mode that gateway ECU40 narrows down the location where communication abnormality generate | occur | produced. It is another example of the data stored as the communication interruption information.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

  Hereinafter, an in-vehicle communication system, a communication abnormality monitoring method, and a program thereof according to an embodiment of the present invention will be described with reference to the drawings. In the in-vehicle communication system of the present embodiment, a plurality of ECUs (Electronic Control Units) are connected to a low-speed body communication protocol represented by CAN (Controller Area Network) or LIN (Local Interconnect Network), and MOST (Media Oriented Systems Transport). Communication is performed using an appropriate communication protocol such as a multimedia communication protocol typified by) and FlexRay. In the following description, it is assumed that communication is performed using CAN.

[Constitution]
FIG. 1 is a system configuration example of an in-vehicle communication system 1 according to an embodiment of the present invention. The in-vehicle communication system 1 includes ECUs 10A, 10B, 10C, 10D, 10E, and 10F, buses 20 and 22, connectors 30, 32 and 34, and a gateway ECU 40 as main components. Hereinafter, the expression “each ECU” refers to the ECUs 10A, 10B, 10C, 10D, 10E, and 10F.

  Each ECU is an information processing apparatus that controls an in-vehicle device and performs various arithmetic processes, and includes, for example, a CPU (Central Processing Unit), a memory, an auxiliary storage device, a CAN controller, a CAN transceiver, and the like.

  FIG. 2 is a data format example of a message output from each ECU to the bus. The message includes a start of frame (SOF) indicating the start of the frame, an ID that is an identifier of the data, a remote transmission request (RTR) for identifying the data frame and the remote frame, a control field that indicates the number of data bytes, and the transfer The data field that is the substance of the data to be transmitted, the CRC sequence to which the CRC for checking the frame error is added, the ACK slot and ACK delimiter for receiving the notification (ACK) from the unit that has received the correct message, and the end of frame indicating the end of the frame Includes a frame (EOF) and the like.

  The CAN controller of each ECU converts the content of the message to be transmitted into a serial transmission signal by the NRZ (Non-Return-to-Zero) method, and outputs it to the CAN transceiver. The CAN controller outputs a voltage having a logic level of low to a bit whose converted signal is “0 (dominant)”, and outputs a voltage having a logic level of high to a bit of “1 (recessive)”. Each bus is, for example, a twisted pair cable, and transmits a signal by a differential voltage method. The CAN transceiver converts the transmission signal acquired from the CAN controller into a differential voltage and outputs it to the bus. That is, when the transmission data is “0”, the CAN transceiver sets the voltage of the H line to a high level (for example, 3.5 [V]) and sets the voltage of the L line to a low level (for example, 1.5 [V]). When the transmission data is “1”, the H line voltage is set to a low level (eg, 2.5 [V]) and the L line voltage is set to a high level (eg, 2.5 [V]).

  When the CAN transceiver acquires information from the bus, it reads the differential voltage of the bus and outputs a received signal shaped to be included in a predetermined voltage range to the CAN controller. A comparator is attached to the receiving terminal of the CAN controller, and a predetermined threshold voltage and a received signal from the CAN transceiver are compared to generate digital data of “1” and “0”, which are stored in the ECU memory or the like. To do.

  The ECUs 10A and 10B are connected to the bus 20 via the connector 30. The ECUs 10 </ b> C and 10 </ b> D are connected to the bus 20 via the connector 32. The ECUs 10E and 10F are connected to the bus 22 via the connector 34.

  The ECUs 10 </ b> A, 10 </ b> B, 10 </ b> C, and 10 </ b> D connected to the bus 20 and the gateway ECU 40 can refer to messages output to the bus 20. In addition, the ECUs 10E and 10F and the gateway ECU 40 connected to the bus 22 can refer to messages output to the bus 22.

  For example, each ECU periodically outputs a message including information on the result of performing various arithmetic processes to a bus connected to the ECU. Each ECU outputs a message at a different period according to the content included in the message. The contents included in the message are indicated by the message ID.

  The gateway ECU 40 includes a CPU, a memory, an auxiliary storage device, a communication controller, a timer 42, and functions as a relay device with a communication system that communicates using a protocol other than CAN, as in the case of each ECU. It is monitored whether or not a communication abnormality has occurred in the communication system 1. Further, the gateway ECU 40 holds, on a memory or an auxiliary storage device, a cycle table 44 indicating the relationship between the ID and the cycle included in the message, and connection information 45 indicating the connection relationship between the bus and the connector. Further, the gateway ECU 40 generates communication interruption information 46, which is a result of monitoring the network, on a memory or an auxiliary storage device.

  As a result of the CPU executing the program stored in the auxiliary storage device or the like, the gateway ECU 40 can perform a network monitoring process described below and a process for identifying a location where an abnormality has occurred. As for the installation of the program executed by the CPU of the gateway ECU 40, for example, the program stored in the portable memory may be installed in the auxiliary storage device, or another computer via a network such as the Internet or a LAN (Local Area Network). You may download more. The program may be stored in advance in an auxiliary storage device, a ROM, or the like when the gateway ECU 40 is shipped.

[Network monitoring by gateway ECU 40]
When the gateway ECU 40 detects the message output to the bus, the gateway ECU 40 refers to the cycle table 44 using the ID included in the message, so that the message is output in the shortest cycle for the transmission source ECU. Can be determined. FIG. 3 is an example of data held as the period table 44. In the figure, A-1, A-2, and A-3 are, for example, messages output by the ECU 10A, and B-1, B-2 are, for example, messages that are output by the ECU 10B.

  The gateway ECU 40 monitors whether or not a message output by each ECU in the shortest cycle has been output to the bus, thereby detecting a communication abnormality of the in-vehicle communication system 1 and writing it in the communication interruption information 46. More specifically, the gateway ECU 40 interrupts the message output by the corresponding ECU when, for example, a message having the same ID is not output to the bus for a predetermined period after detecting that the message has been normally output. Is detected. When there is an ECU that outputs a message to the bus only in one type of cycle, the message in that cycle is monitored.

  FIG. 4 is an example of a flowchart showing a flow of network monitoring processing executed by the gateway ECU 40. This flowchart is executed for each ECU to be monitored (hereinafter referred to as ECU_X).

  In the following description, information such as a break flag, a break counter, a first break time, a break time (cumulative), a break time (shortest), a break time (intermediate), a break time (longest) is stored in the CPU of the gateway ECU 40, for example. Data to be written to Based on these data, communication interruption information 46 is generated. FIG. 5 is an example of data stored as the communication interruption information 46.

  First, the gateway ECU 40 determines whether or not the message * output by the ECU_X in the shortest cycle is detected on the bus (S100).

  * When the gateway ECU 40 detects a message * output by the ECU_X in the shortest cycle, the gateway ECU 40 writes the detected time (hereinafter referred to as a message detection time) in a memory or the like (S102).

  Next, the gateway ECU 40 determines whether or not the interruption flag indicating that communication interruption is continuing is set to 1 (S104). When the interruption flag is not set to 1, the gateway ECU 40 ends one routine of this flowchart.

  When the interruption flag is set to 1, the gateway ECU 40 determines whether or not the time when the interruption flag is set to 1 in S132 is earlier than the previous message detection time (S106). When the time when the interruption flag is set is earlier than the previous message detection time, the gateway ECU 40 sets the interruption flag to 0, and the interruption time (cumulative), interruption time (shortest) on the memory, The interruption time (intermediate) and the interruption time (longest) are cleared (S108), and one routine of this flowchart is terminated.

  When the time when the interruption flag is set to 1 is after the previous message detection time, the gateway ECU 40 determines whether or not the value of the interruption counter is once (S110). When the value of the interruption counter is once, the gateway ECU 40 determines the elapsed time of the timer 42 from the time when the interruption flag is set to 1 in S132, the interruption time (cumulative) on the memory, and the interruption time (shortest). ), The interruption time (intermediate), and the interruption time (longest) are written (S112).

  When the value of the interruption counter is not once, the gateway ECU 40 determines whether or not the value of the interruption counter is twice (S114). When the value of the interruption counter is two times, the gateway ECU 40 adds the elapsed time of the timer 42 from the time when the interruption flag is set to 1 in S132 to the interruption time (cumulative), and further on the memory. Of the interruption time (shortest), interruption time (intermediate), and interruption time (longest), the corresponding item is overwritten (S116). For example, the interruption time (cumulative), the interruption time (shortest), the interruption time (intermediate), and the interruption time (longest) are each 20 [ms], and the elapsed time of the current timer 42 is 30 [ms]. For example, the interruption time (cumulative) is set to 50 [ms], and the interruption time (intermediate) and the interruption time (longest) are changed to 30 [ms].

  When the value of the interruption counter is not twice, that is, when the value of the interruption counter is three times, the gateway ECU 40 determines the elapsed time of the timer 42 from the time when the interruption flag is set to 1 in S132. Then, it is added to the interruption time (cumulative total), and further, the corresponding item is overwritten in the interruption time (shortest), interruption time (intermediate), and interruption time (longest) on the memory (S118). For example, the interruption time (cumulative), interruption time (shortest), interruption time (intermediate), and interruption time (longest) are 50 [ms], 20 [ms], 30 [ms], and 30 [ms], respectively. If the elapsed time of the current timer 42 is 40 [ms], the interruption time (cumulative) is set to 90 [ms] and the interruption time (longest) is changed to 40 [ms].

  Next, the gateway ECU 40 determines that the disruption relating to the message * has been determined by detecting the disruption three times, and the disruption time (cumulative), disruption time (shortest), disruption time (intermediate), disruption time ( The corresponding ECU part in the communication interruption information 46 is updated (S120).

  Then, the gateway ECU 40 sets the interruption flag to 0 and clears the interruption time (cumulative), the interruption time (shortest), the interruption time (intermediate), and the interruption time (longest) on the memory (S122). 1 routine is completed. Further, the gateway ECU 40 clears the value of the interruption counter.

  * On the other hand, when the gateway ECU 40 does not detect the message * output by the ECU_X in the shortest cycle, the gateway ECU 40 determines whether or not the elapsed time from the previous message detection time has reached a predetermined time or more (S130). When the elapsed time from the previous message detection time is less than the predetermined time, the process returns to S100.

  When the elapsed time from the previous message detection time becomes equal to or longer than the predetermined time, the gateway ECU 40 sets the interruption flag to 1 (S132), and increases the value of the interruption counter by 1 (S134).

  The communication interruption information 46 updated in S120 is output to the diagnosis tool 50 in response to a request from the diagnosis tool 50 connected to an OBD (On Board Diagnosis) connector 48. The OBD connector 48 is attached to, for example, a side portion of the steering wheel, and a cable extending from the diagnosis tool 50 can be connected thereto.

  FIG. 6 is a timing chart showing various data changes when the network monitoring is performed by the gateway ECU 40. In this figure, the interruption time (intermediate) in the communication interruption information 46 is not collected.

ECU to be monitored For example, X outputs a message * to the bus in the shortest cycle (10 [ms]). ECU The output timing of the message * output by X in the shortest cycle is indicated by “▽” in the figure. A solid line “▽” indicates that the message * has been normally output to the bus, and a broken line “▽” indicates that the message * has not been output to the bus.

At time t1 in FIG. 6, the gateway ECU 40 The interruption of the message * output by X is detected. As described above, the gateway ECU 40 did not output the message * with the same ID to the bus for a predetermined period (about 30 [ms] in the case of FIG. 6) after detecting that the message * was normally output. If the ECU The interruption of the message * output by X is detected.

The gateway ECU 40 is an ECU When the interruption of the message * output by X is detected, the ECU Change the value of the interruption counter for X to “once”. Here, the reason why the predetermined period is longer than 10 [ms] is to prevent frequent interruptions due to deviations in the internal clock of the ECU. Further, the gateway ECU 40 stores the first interruption time in a memory or the like.

  Next, at time t2 (t2-t1 = 20 [ms]), the gateway ECU 40 detects that the message * has been output to the bus. The gateway ECU 40 writes 20 [ms] in the interruption time (cumulative), the interruption time (shortest), and the interruption time (longest) on the memory.

Next, at time t3, the gateway ECU 40 detects the interruption of the message *. The gateway ECU 40 is an ECU Change the value of the interruption counter for X to “twice”.

  Next, at time t4 (t4-t3 = 50 [ms]), the gateway ECU 40 detects that the message * has been output to the bus. The gateway ECU 40 writes 70 [ms] in the interruption time (accumulation) on the memory and 50 [ms] in the interruption time (longest).

Next, at time t5, the gateway ECU 40 detects the interruption of the message *. The gateway ECU 40 is an ECU Change the value of the interruption counter for X to “twice”.

  Next, at time t6 (t6-t5 = 10 [ms]), the gateway ECU 40 detects that the message * has been output to the bus. The gateway ECU 40 writes 80 [ms] in the interruption time (cumulative) on the memory and 10 [ms] in the interruption time (shortest).

  As described above, the gateway ECU 40 monitors only the messages output in the shortest cycle among the messages output by each ECU and detects the abnormal communication of the in-vehicle communication system 1, and therefore, compared with the case where all the messages are monitored. Thus, the monitoring load can be reduced. Further, it is possible to accurately detect an abnormality (instantaneous interruption) in which the connection in the network is momentarily interrupted as compared with the case of selectively monitoring messages output in a long cycle.

[Identify the location where the error occurred]
In addition, the gateway ECU 40 of the present embodiment has a function of identifying a location where an abnormality has occurred based on the communication interruption information 46.

  FIG. 7 is an example of a flowchart showing a flow of communication abnormality occurrence location specifying processing executed by the gateway ECU 40. Here, bus 20 = bus (1), bus 22 = bus (2), connector 30 = connector (1) belonging to bus (1), connector 32 = connector (2) belonging to bus (1), connector 34 = Treated as connector (1) belonging to bus (2). The gateway ECU 40 grasps the connection relationship between the bus and the connector based on the connection information 45 illustrated in FIG. FIG. 8 is an example of data stored as connection information.

  The gateway ECU 40 sets an initial value 1 to a parameter i that functions as a bus identifier (S200), and starts analyzing a communication abnormality of the bus (i) (S202).

  Next, the gateway ECU 40 sets an initial value 1 to a parameter j that functions as a connector identifier (S204), and starts communication abnormality analysis of the connector (j) belonging to the bus (i) (S206).

  Next, the gateway ECU 40 determines whether or not a disconnection history exists in the ECU connected to the connector (j) belonging to the bus (i) (whether or not the “number of disconnections” in the communication disruption information 46 is one or more). ) Is determined (S208). If no disconnection history exists in the ECU connected to the connector (j) belonging to the bus (i), the process proceeds to S216.

  When there is a disruption history in the ECU connected to the connector (j) belonging to the bus (i), the gateway ECU 40 determines whether there is one ECU with the disruption history (S210).

  When there is one ECU having a history of disruption, the gateway ECU 40 communicates between the ECU having the history of disruption or the connector (j) belonging to the bus (i) and the ECU having the history of disruption. It is determined that an abnormality has occurred (S212).

  When there are a plurality of ECUs having a history of disruption, the gateway ECU 40 communicates between the connector (j) belonging to the bus (i) or the connector (j-1) belonging to the bus (i) and the connector (j). It is determined that an abnormality has occurred (S214). However, the gateway ECU 40 determines that an abnormality has occurred in the communication line between the port of the gateway ECU 40 and the connector (j) belonging to the bus (i) or the port of the gateway ECU 40 when j = 1.

  When the processing of S208 to S214 is completed, the gateway ECU 40 increases the parameter j by 1 (S216).

  Next, the gateway ECU 40 determines whether or not the parameter j exceeds the upper limit number M (i) determined for each bus (S218). When the parameter j does not exceed the upper limit number M (i) determined for each bus, the gateway ECU 40 returns to S206 and executes the process. The upper limit number M (i) is the number of connectors determined for each bus according to the design of the system, and is a value stored in advance in the ROM or the auxiliary storage device.

  When the parameter j exceeds the upper limit number M (i) determined for each bus, the gateway ECU 40 increases the parameter i by 1 (S220).

  Next, the gateway ECU 40 determines whether or not the parameter i exceeds the upper limit number N (S222). When the parameter i does not exceed the upper limit number N, the gateway ECU 40 returns to S202 and executes the process. The upper limit number N is the number of buses determined according to the system design, and is a value stored in advance in a ROM or an auxiliary storage device.

  When the parameter i exceeds the upper limit number N, the gateway ECU 40 ends the process of this flowchart.

  When the gateway ECU 40 identifies the location where the communication abnormality has occurred in this way, the gateway ECU 40 adds the identification result to, for example, the communication disruption information 46 and outputs it to the diagnosis tool 50.

  As described above, the gateway ECU 40 first narrows down the bus where the communication abnormality has occurred, and then narrows down the connector, so that the location where the communication abnormality has occurred can be accurately identified. FIG. 9 is a diagram schematically illustrating a state in which the gateway ECU 40 narrows down the location where the communication abnormality has occurred.

[Summary]
According to the in-vehicle communication system, the communication abnormality monitoring method, and the program according to the present embodiment described above, only the messages output in the shortest cycle among the messages output from each ECU are monitored and the different communication of the in-vehicle communication system 1 is performed. Since the normal state is detected, the monitoring load can be reduced as compared with the case where all messages are monitored. Further, it is possible to accurately detect an abnormality (instantaneous interruption) in which the connection in the network is momentarily interrupted as compared with the case of selectively monitoring messages output in a long cycle.

  In addition, according to the in-vehicle communication system, the communication abnormality monitoring method, and the program of this embodiment, the gateway ECU 40 first narrows down the bus where the communication abnormality has occurred, and then narrows down the connector. It is possible to accurately identify the place where it occurred.

[Deformation etc.]
The best mode for carrying out the present invention has been described above with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the scope of the present invention. And substitutions can be added.

  For example, in the above embodiment, the ECU is connected by a bus. However, an information processing device such as an ECU may be connected to a serial communication line or a wireless communication network.

  Further, the communication interruption information 46 may be in a simpler format as shown in FIG. FIG. 9 is another example of data stored as the communication interruption information 46.

  In addition, the gateway ECU 40 refers to the cycle table 44 using the ID included in the message to determine whether or not the message is a message that is output in the shortest cycle for the transmission source ECU. A configuration in which such a function capable of deriving the period is included in the execution program of the CPU may be employed.

  Further, in FIG. 5, the interruption time (shortest), the interruption time (intermediate), and the interruption time (longest) of each ECU are described as being one value, but the interruption time (shortest), interruption time (intermediate), Each interruption time (longest) may be a time range. For example, in the case of the ECU 10A in FIG. 5, <disruption time (shortest): 22.5 [ms] or less, disruption time (intermediate): 22.5 to 27.5 [ms], disruption time (longest): 27.5 [Ms] or more> may be defined.

1 In-vehicle communication system 10A, 10B, 10C, 10D, 10E, 10F ECU
20, 22 Bus 30, 32, 34 Connector 40 Gateway 42 Timer 44 Periodic table 46 Communication disruption information 48 OBD connector 50 Diagnostic tool

Claims (8)

An in-vehicle communication system mounted on a vehicle,
A plurality of information processing means connected to a network constituted by a communication line and a relay device , and periodically outputting data to the network;
Of the data that is output to periodically the network by each of said plurality of information processing means, to determine the data that is output in the shortest period by each of said plurality of information processing means, wherein the data that is output by the outermost short period Monitoring means for detecting a communication abnormality of the in-vehicle communication system by selectively monitoring whether it is output to the network;
Equipped with a,
The monitoring means has a function of narrowing down the places where the communication abnormality has occurred, narrows down the places where the communication abnormality has occurred regarding the communication line, and then narrows down the places where the communication abnormality has occurred regarding the relay apparatus. ,
In-vehicle communication system. The in-vehicle communication system according to claim 1,
Said monitoring means includes identification information of the data included in the data that will be output to periodically the network by each of said plurality of information processing means, the table data associating the period in which the data is output to the network has, by referring to the table data, you determine the data that is output by the shortest period by each of said plurality of information processing means,
In-vehicle communication system. The in-vehicle communication system according to claim 1 or 2,
It said monitoring means, for each of the plurality of information processing means, to record the number of times that the communication abnormality occurs, you outputs data including the communication error occurrence frequency of each of the plurality of information processing means and the recording,
In-vehicle communication system. The in-vehicle communication system according to any one of claims 1 to 3,
Said monitoring means, for each of the plurality of information processing means, to output the data including data related to said communication abnormality records data about extended periods, the recorded communication abnormality duration of each of the plurality of information processing means The
In-vehicle communication system. The in-vehicle communication system according to any one of claims 1 to 4,
Said monitoring means, in each period in which the communication abnormality continues, records the number of times that the communication abnormality occurs, it outputs data including the communication error occurrence count for each communication abnormality duration that the recording,
In-vehicle communication system. The in-vehicle communication system according to any one of claims 1 to 5 ,
Before Symbol monitoring means during said shortest period longer than the set is a predetermined period corresponding to one information processing means included in said plurality of information processing means, is output in the shortest period by the one information processing means Detecting the communication abnormality when data is not output to the network ,
In-vehicle communication system. A communication abnormality monitoring method for an in-vehicle communication system comprising a plurality of information processing means connected to an in-vehicle network constituted by a communication line and a relay device and periodically outputting data to the in- vehicle network,
The monitoring device that the in-vehicle communication system has,
Of the data that is output to periodically the vehicle network by each of said plurality of information processing means, to determine the data that is output in the shortest period by each of said plurality of information processing means,
By data that is output by the discriminated shortest period is selectively monitors whether or not output to the vehicle network, thereby detecting the communication abnormality of the vehicle communication system,
Narrow down the occurrence of the communication abnormality related to the communication line,
Next, narrowing down the occurrence of the communication abnormality related to the relay device ,
Communication abnormality monitoring method for in-vehicle communication system. A communication abnormality monitoring program for an in-vehicle communication system that is connected to an in-vehicle network constituted by a communication line and a relay device and includes a plurality of information processing means for periodically outputting data to the in- vehicle network,
In the monitoring device that the in-vehicle communication system has,
Of the data that is output to periodically the vehicle network by each of said plurality of information processing means, to determine the data that is output in the shortest period by each of said plurality of information processing means,
The Rukoto selectively to monitor whether the discriminated data in the shortest period Ru output was is output to the onboard network, it causes detects the communication abnormality of the vehicle communication system,
Let us narrow down the location of the communication abnormality related to the communication line,
Next, the occurrence of the communication abnormality related to the relay device is narrowed down .
A communication abnormality monitoring program for in-vehicle communication systems.

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