JP2003137047A - On-vehicle device communication system and in-vehicle communication controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle device communication system and an in- vehicle communication controller, capable of coping with an increase in an information amount transmitted/received in communication inside a vehicle without increasing the number of harnesses connecting on-vehicle devices, and executing abnormality detection of the on-vehicle device and the coping process therefor. SOLUTION: By connecting the communication controller 1 and the respective on-vehicle devices (ECU- a, ECU- b, etc.), 2, 2, etc., by use of optical cables, in-vehicle communication networks L1-L3 constituting a token ring network are constructed, and the communication controller 1 manages the token ring network as a master by use of a managing frame, a status-managing frame, a diagnosing frame or the like. A wavelength (a frequency) of a transmitted optical signal is multiplexed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-vehicle device communication system which mounts a larger number of in-vehicle devices and is capable of detecting an abnormality in each in-vehicle device, and an in-vehicle communication control device used in the system.

[0002]

2. Description of the Related Art A large number of electronic devices (vehicle-mounted devices) are mounted on a vehicle, and these are connected to each other to provide an in-vehicle LAN.
Is being built. The in-vehicle LAN is connected to each on-vehicle device by using a metal cable, and is connected to ISO11519-2, ISO11898.
CAN (Controller Area Network) based on etc., SA
J236 based on E (Society of Automotive Engineers)
6 and so on are used.

By the way, the number of on-vehicle devices mounted on the vehicle has been increasing along with the high technology of vehicles in recent years, and the amount of information communication between the inside and outside of the vehicle is also rapidly increasing. Therefore, conventionally, the new wiring harness for connecting the in-vehicle devices has been installed to cope with the increase in in-vehicle devices, and the line for transmitting and receiving information has been multiplexed to cope with the increase in information communication volume. is doing.

[0004]

However, since a wire harness is conventionally used and a large number of wire harnesses have already been laid inside the vehicle, it is necessary to cope with the future increase in in-vehicle equipment. It is difficult to secure a place for new installation. Further, even if the laying place is secured, the weight of the vehicle is increased and the exhaust gas discharged is increased. In recent years, exhaust gas emission environmental standards have become stricter in the world, and it is necessary to avoid laying a new wire harness that accompanies an increase in exhaust gas.

In addition, with the increase in the number of in-vehicle devices and the increase in the amount of information communication between the inside and outside of the vehicle, the shortage of capacity in the wire harness is becoming more serious. For example, the above-mentioned CA
The maximum communication speed of N is 1 Mbps, and that of J2366 is about 115 kbps, and it is not possible to cope with the increase in the amount of information communication in the future.

The present invention has been made in view of the above-described circumstances, and an optical cable is laid between in-vehicle devices to construct an in-vehicle device communication system using optical communication, and a wavelength ( Alternatively, it is possible to transmit much more information at high speed in optical communication which can realize a communication speed of several Gbps or more depending on the selection of the optical cable and the data link by transmitting the information by multiplexing the frequency). In addition, a vehicle-mounted device communication system that has a sufficient capacity even in consideration of future increase in information communication volume, can reduce the number of harnesses to be laid, and can also reduce vehicle assembly cost, and the system An object is to provide an in-vehicle communication control device to be used.

Further, by detecting an abnormal state of each in-vehicle device, for example, an in-vehicle device being inoperable, a frequency band used for optical communication being unusable, or the like, high reliability is achieved. An object is to provide an in-vehicle device communication system capable of constructing an in-vehicle LAN and an in-vehicle communication control device used in the system.

Further, as a result of the detection of the abnormal state, when an abnormal state indicating that the frequency band used in the optical communication is unusable by any on-vehicle device is detected, another frequency band is used instead of the frequency band. The frequency band used for optical communication can be flexibly changed by changing the frequency band to be used, and a vehicular device communication system capable of constructing an in-vehicle LAN having high durability and reliability, and used for the system An object is to provide an in-vehicle communication control device.

[0009]

An in-vehicle device communication system according to a first aspect of the present invention is an in-vehicle device communication system for performing optical communication between a plurality of in-vehicle devices included in a vehicle, wherein information transmitted by the optical communication is multiplexed. It is characterized in that it is provided with a means for converting.

The in-vehicle device communication system according to the second invention is
The in-vehicle device communication system according to the first aspect of the present invention further comprises means for detecting an abnormal state including an abnormal condition in which the in-vehicle device is inoperable and an abnormal condition in which the frequency band used in the optical communication cannot be used. To do.

The in-vehicle device communication system according to the third invention is
In the vehicle-mounted device communication system according to the second aspect of the present invention, further comprising means for changing the frequency band used for optical communication to another frequency band when an abnormal state in which the frequency band used for optical communication is unusable is detected. It is characterized by

An in-vehicle communication control device according to a fourth aspect of the present invention is an in-vehicle communication control device for controlling optical communication between a plurality of nodes connected to a communication line provided in a vehicle. It is characterized by comprising means for multiplexing.

An in-vehicle communication control device according to a fifth aspect of the present invention is the fourth aspect.
The in-vehicle communication control device according to the present invention is characterized by further comprising means for detecting an abnormal state including an abnormality in which the node cannot operate and an abnormality in which the frequency band used in the optical communication cannot be used.

An in-vehicle communication control device according to a sixth aspect of the present invention is the fifth aspect.
The in-vehicle communication control device according to the invention further comprises means for changing the frequency band used in the optical communication to another frequency band when an abnormal state in which the frequency band used in the optical communication is unusable is detected. Characterize.

In the case of the first invention and the fourth invention, an optical cable is laid between in-vehicle devices to use optical communication, and wavelengths (or frequencies) are multiplexed in transmission of information by the optical communication. In optical communication capable of achieving a communication speed of several Gbps or more, more information can be transmitted at high speed, and a sufficient capacity can be provided even in consideration of future increase in information communication volume. It is possible to realize an in-vehicle device communication system that can reduce the number of harnesses to be laid and also reduce the vehicle assembly cost, and an in-vehicle communication control device used in the system.

According to the second and fifth aspects of the invention, by detecting an abnormal condition such as in-vehicle equipment being inoperable or the frequency band used for optical communication being unusable,
It is possible to realize an in-vehicle device communication system capable of constructing a highly reliable in-vehicle LAN and an in-vehicle communication control device used in the system.

According to the third and sixth inventions, when an abnormal state indicating that the frequency band (wavelength band) used in the optical communication cannot be used by any of the in-vehicle devices is detected,
By changing to use another frequency band instead of the above frequency band, the frequency band used for optical communication can be flexibly changed, and a vehicle equipment communication capable of constructing an in-vehicle LAN with high durability and reliability A system and an in-vehicle communication control device used for the system can be realized.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. FIG. 1 is a schematic diagram showing a configuration of an in-vehicle device communication system according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a communication control device (vehicle-mounted communication control device) according to the present invention, and the communication control device 1 and a plurality of ECUs (Electronic Control Units) 2 such as an engine control ECU and an ABS ECU as vehicle-mounted devices. , 2,
... are connected in a daisy chain using one optical cable,
In-vehicle communication networks (in-vehicle LAN) L1 to L3 are constructed. In the present embodiment, in order to transmit and receive information by transmitting an optical signal in which a plurality of wavelengths are multiplexed in the optical cable,
The ECUs 2, 2, which are substantially connected to one optical cable
.. realize a plurality of in-vehicle communication networks L1 to L3.
Further, for example, even in the communication within one in-vehicle communication network L1, information can be multiplexed and transmitted, and more information can be transmitted and received. The wavelengths that can be transmitted using the optical cable are λ0, λ1, λ2, ..., λn.

FIG. 2 is a block diagram showing the configuration of the communication control device 1. The communication control device 1 includes a CPU 10 and the C
The PU 10 includes a RAM 11, a ROM 12, an abnormal record database (hereinafter referred to as an abnormal record DB) 13, a wavelength multiplexing transmitter 1.
4, wavelength division multiplexing reception unit 15, frame division / assembly unit 17,
It controls the operation of hardware such as the transmission data generation unit 16, the reception frame determination unit 18, and the transmission wavelength selection unit 19.

The RAM 11 temporarily stores data generated when the CPU 10 performs arithmetic processing, and also temporarily stores data transmitted / received by the wavelength multiplex transmitter 14 and the wavelength multiplex receiver 15, which will be described later. .

The ROM is composed of a mask ROM or PROM, etc., and stores various programs necessary for operating the communication control device 1 in addition to the abnormality detection program 12a and the recording / updating program 12b. The abnormality detection program 12a is loaded into the RAM 11 and executed by the CPU 10 to determine whether or not an abnormality has occurred in the ECUs 2, 2, ... Connected to the communication control device 1 in the vehicle-mounted device communication system according to the present embodiment. Or a program for detecting the type of abnormality. Similarly, the record update program 12b causes the CPU 11 to record the information on the abnormality detected based on the abnormality detection program 12a (hereinafter, abnormality information) in the abnormality record database (hereinafter, abnormality record DB) 13 including a hard disk or the like. It is a program for updating the contents.

The wavelength multiplex transmission unit 14 is hardware for multiplexing the transmission wavelengths selected by the transmission wavelength selection unit 19, which will be described later, and transmitting the multiplexed signals to the outside.
Is shown in the block diagram of. The wavelength division multiplexing transmission unit 14 includes a plurality of laser variable light sources 141, 141, ... Which can oscillate an optical signal of a desired wavelength.
.. oscillate optical signals of different wavelengths. The optical signals oscillated by the laser variable light sources 141, 141, ... Based on the instruction from the transmission wavelength selection unit 19 are transmitted to the wavelength multiplexer 143 by the transmitters 142, 142 ,. Are multiplexed and transmitted to the outside. Therefore, optical signals in which a plurality of different wavelengths are multiplexed are transmitted in the in-vehicle communication networks L1 to L3. The wavelength multiplexer 143 can multiplex optical signals of all wavelengths λ0, λ1, λ2, ..., λn.

The wavelength multiplexing receiver 15 is hardware for externally receiving the multiplexed optical signal, and its configuration is shown in the block diagram of FIG. WDM receiver 15
Includes a wavelength demultiplexer 151 capable of demultiplexing the multiplexed optical signal into all included wavelengths.
The optical signals corresponding to the respective wavelengths demultiplexed by are input to the wavelength selective receivers 152, 152, .... The wavelength selective receivers 152, 152, ... Are for selectively receiving only optical signals of required wavelengths, and correspond to the wavelengths selected by the wavelength selective receivers 152, 152 ,. The optical signals to be transmitted are O / E (optical / electrical converter) 153, 15
3 are input, converted into electric signals, and taken into the communication control device 1. The wavelength demultiplexer 151
Can demultiplex optical signals of all wavelengths λ0, λ1, λ2, ..., λn.

The transmission data generation unit 16 is for generating data to be transmitted to the outside via the wavelength multiplexing transmission unit 14 according to an instruction from the CPU 10, and the generated data is a frame division / assembly unit. It is input to 17 and divided into frames (data blocks).

The received frame discriminating unit 18 discriminates whether or not the frame should be received by the communication control device 1 from the destination address attached to the frame received via the wavelength division multiplexing receiving unit 15. If the communication control device 1 determines that the frame is to be received, the frame is input to the frame division / assembly unit 17 to assemble the frame.

The transmission wavelength selection unit 19 is the wavelength division multiplexing transmission unit 1.
This is for selecting the wavelength to be assigned to the data to be transmitted to the outside through the error detection program 12a. When the abnormality detection program 12a detects that the transmission destination ECU 2 cannot use a certain frequency band, The frequency band can be selected to be utilized.

FIG. 5 is a block diagram showing the configuration of the ECU 2. The ECU 2 includes a CPU 20, and the CPU 20
RAM 21, ROM 22, wavelength division multiplexing transmission section 23, wavelength division multiplexing reception section 24, transmission data generation section 25, frame division /
It controls the operation of hardware such as the assembling unit 26, the reception frame determining unit 27, and the transmission wavelength selecting unit 28.

The hardware whose operation is controlled by the CPU 20 is the RAM 11, the ROM 12, the wavelength multiplex transmission unit 14, in the communication control device 1 shown in FIG.
The wavelength multiplexing receiver 15, the transmission data generator 16, the frame dividing / assembling unit 17, the reception frame discriminating unit 18, and the transmission wavelength selecting unit 19 have substantially the same functions, and therefore detailed description thereof is omitted here. To do. However, the ROM 2 provided in the ECU 2
Reference numeral 2 denotes an abnormality detection program 12a and a record update program 1 stored in a ROM 12 included in the communication control device 1.
2b is not needed. In addition, the wavelength multiplexing transmitter 23 and the wavelength multiplexing receiver 24 have all the wavelengths λ0, λ1, λ2, ..., λn.
On the other hand, it is not necessary to combine and demultiplex.

Next, the operation of the in-vehicle device communication system having the above-mentioned configuration at the time of startup will be described. In addition,
The in-vehicle communication networks L1 to L3 forming the in-vehicle device communication system according to the present embodiment are token ring networks using token passing, and the communication control device 1 serves as a master to connect the in-vehicle communication networks L1 to L3. to manage.

FIG. 6 is a schematic diagram for explaining a flow of operations at the time of starting the communication system for a vehicle-mounted device. As described above, the communication control device 1 serves as a master and each of the in-vehicle communication networks L1 to L3 and the ECUs 2, 2, ...
In order to manage the above, all wavelengths (λ0, λ1, λ2, ..., λn) of optical signals that can be used in the in-vehicle communication networks L1 to L3 must be able to be combined and demultiplexed. Further, it is necessary to recognize the ECUs 2, 2, ... Which share the wavelength for each wavelength to be used. Therefore, immediately after the power is turned on, the communication control device 1 uses the optical signals of all wavelengths to manage the management frame F,
Send F, ...

The management frame has a packet-shaped data structure, and has a destination, a source, control bits, message data, and a check code. Fields corresponding to each of the ECUs 2, 2, ... Are provided in advance in the message data, and the E for receiving the management frame F transmitted by the optical signal of the wavelength used in the own device is received.
The CU2 writes its own identifier in the corresponding field and sequentially transfers it to the next ECU2. That is, for example, the ECU 2 that has received the management frame F in the in-vehicle communication network L1
(ECU_a in the figure) writes the identifier in the field assigned to itself, and the adjacent ECU 2 (ECU_b in the figure)
Transfer to. As a result, the number and types of ECUs 2 for each wavelength are grasped by the management frame F returned to the communication control device 1. The wavelengths λ0, λ1, λ2, ..., λ
Of n, optical signals having wavelengths λ1, λ2, ..., λn are assigned to information transmission paths with the ECUs 2, 2, ..., And optical signals having wavelength λ0 are assigned to management paths.

Next, the communication control device 1 uses the in-vehicle communication network L1.
The status management is performed in order to grasp the status of the ECU 2, 2, ... FIG. 7 is a flowchart for explaining the flow of operations when the communication control device 1 performs status management. First, the communication control device 1 uses the ECU 2 (ECU
_x, x = a, b, ...) A status management frame is transmitted via the wavelength multiplexing transmitter 14 (S1), and immediately thereafter, the communication control device 1 starts measuring time (S2). , And the number (x) of the destination ECU 2 of the transmitted frame is R
It is stored in the AM 11 (S3). When the destination ECU 2 receives the frame, the destination address of the frame is set as the communication control device 1 and the transmission source address is set as its own device and is returned to the communication control device 1.

Based on the time measured in step 2, the received frame discriminating unit 18 determines whether or not the returned frame is received via the wavelength multiplex receiving unit 15 within a preset predetermined time. It is determined (S4). As a result of the determination, when the frame is received within the predetermined time, the received frame determination unit 18 determines whether or not it matches the number stored in step 3 based on the number of the ECU 2 which is the transmission source of the received frame. It is determined (S5). As a result, when it is determined that the numbers match, the number of the destination ECU is incremented (S6), and the operation from step 1 is repeated.

On the other hand, if it is determined in step 4 that the reception of the frame is outside the predetermined time, the number of the destination ECU 2 is incremented (S6), and the operation from step 1 is repeated. If it is determined in step 5 that the number of the transmission source ECU 2 of the received frame does not match the stored number, the received frame is discarded (S7) and the frame is received within a predetermined time. Whether or not it is determined again (S4), and thereafter, the operation as described above is performed.

By performing the above-mentioned operation for all the numbers of the destination ECU 2, the frame cannot be received within the predetermined time, and the EC which is the source of the received frame is transmitted.
If there is an ECU 2 whose U number is different from the stored number, it can be determined that some abnormality has occurred in the ECU 2.

Abnormal states in the ECU 2 include a case where the wavelength used for optical communication is unusable in the ECU 2 (combining impossible, demultiplexing impossible) and the EC
It is conceivable that U2 is out of order and communication is impossible (unreceivable, untransmittable).

Next, in the in-vehicle communication network (for example, in-vehicle communication network L1) that is performing optical communication using the optical signal of wavelength λx, if the transmission of the status management frame fails, an abnormality occurs. The diagnosis of the abnormal state of the ECU 2 being executed will be described. The diagnosis is performed by operating the CPU 10 based on the abnormality detection program 12a.

First, the communication control device 1 transmits a diagnostic frame to the in-vehicle communication network L1. Target E
When the CU 2 is capable of receiving and transmitting, information about a usable wavelength band is written in the message data of the received frame instead of λx, and the message is returned to the communication control device 1.
When the communication control device 1 receives this, the content of the message data is read, and the information indicating that the target ECU 2 cannot use the optical signal of the wavelength λx is updated and recorded in the abnormality record DB 13 based on the record update program 12b. Next, the wavelength to be used instead of λx is selected from the optical signals in the wavelength band usable by the ECU 2, and thereafter, normal communication is performed.

When the diagnostic frame is not returned, that is, when the frame cannot be received within the predetermined time, the communication control device 1 diagnoses that the ECU 2 has a failure and notifies the abnormality record DB 13 accordingly. Is updated and recorded, and is displayed and output so that the driver in the vehicle can recognize it.

Next, the operation when normal data transmission is performed in each of the in-vehicle communication networks L1 to L3 will be described. Figure 8
3 is a flowchart for explaining a flow of operations when data is received from the ECU 2 (for example, ECU_b in FIG. 1) according to an instruction from the communication control device 1. First, the communication control device 1 transmits a frame including a message requesting data to the ECU 2 (ECU_b) (S10). At this time, when data is transmitted to a plurality of ECUs 2, 2, ... Which communicate at the same time with different wavelengths, the wavelength multiplexer 143 multiplexes a plurality of wavelengths and transmits them.

The ECU 2 receiving this (S11) determines whether or not it is destined for its own device based on the destination by the reception frame discriminating unit 27 (S12).
The frame is relayed to (ECU_e in FIG. 1) (S1
3). When it is determined that it is addressed to the self device, the message data is read (S14), the data requested according to the instruction from the communication control device 1 is included in the message data, the destination address is the communication control device 1, and the sender address is the ECU.
The reply data frame 2 (ECU_b) is created by the transmission data generation unit 25 and the frame division / assembly unit 26 (S15), and the frame is transmitted to the communication control device 1 (S16).

On the other hand, the communication control device 1 starts measuring time immediately after transmitting the frame to the ECU 2 in step 10 (S17), and stores the number (b) of the destination ECU 2 in the RAM 11 (S18). .

When the communication control device 1 receives the frame transmitted from the ECU 2 in step 16 (S19),
Based on the measurement of the time started in step 17, the received frame determination unit 18 determines whether or not the frame is received within a preset predetermined time (S20). When it is determined that the frame is received within the predetermined time,
Based on the number of the ECU 2 that is the transmission source of the received frame, the received frame determination unit 18 determines whether the number matches the number stored in step 18 (S21). As a result, when it is determined that the numbers match, the message data is read from the frame and the data is acquired (S22).

If it is determined in step 20 that the frame has been received outside the predetermined time, and step 2
When it is determined in 1 that the number of the transmission source ECU 2 of the received frame does not match the stored number, a predetermined error process is performed (S23). As the error processing, for example, the received frame is discarded and step 10 is performed.
Is performed again, or the above-described diagnosis of the ECU 2 is performed.

In the description of FIG. 8, the communication control device 1
After the frame is received in step 19, it is determined in step 20 whether or not the frame is received within a predetermined time. However, a predetermined preset value is set before the reception in step 19. When the time has passed, the error processing shown in step 23 may be performed at that time.

Communication control device 1 and ECU as described above
Communication between the two is performed by multiplexing the wavelengths of optical signals used for information transmission, and thus a plurality of in-vehicle communication networks L1 to L
It is possible to carry out simultaneously with the ECUs 2, 2, ... Connected to the ECU 3, and since information is transmitted by an optical signal using an optical cable, a large amount of information can be handled.

According to the vehicle-mounted device communication system and the in-vehicle communication control device according to the present embodiment, an optical cable is laid between the ECUs 2, 2, ... And the communication control device 1, and an in-vehicle LAN (in-vehicle communication network L1) is provided by optical communication. ~ L3) is constructed and wavelengths are multiplexed, the number of harnesses can be reduced and a large amount of information can be transmitted at high speed.

Further, the abnormality that has occurred in the ECU 2, especially the abnormal state in which a specific wavelength (frequency) cannot be used, the ECU 2
It is possible to distinguish and detect an abnormal state where the device itself fails and communication is impossible.

[0049]

According to the first and fourth inventions, several Gb
More information can be transmitted at high speed in optical communication capable of realizing a communication speed of ps or more, and sufficient capacity can be provided even if the future increase in information communication volume is taken into consideration. You can reduce the number of harnesses,
It is possible to realize an in-vehicle device communication system that can reduce the vehicle assembly cost and an in-vehicle communication control device used in the system.

According to the second and fifth aspects of the present invention, it is possible to detect an abnormal state such that the on-vehicle device is inoperable, the frequency band used for optical communication is unusable, etc., and reliability is improved. An in-vehicle device communication system capable of constructing a high in-vehicle LAN and an in-vehicle communication control device used in the system can be realized.

In the case of the third and sixth inventions, when an abnormal state indicating that the frequency band (wavelength band) used in the optical communication cannot be used by any on-vehicle device is detected,
A vehicle device that can be changed to use another frequency band instead of the frequency band, can flexibly change the frequency band used for optical communication, and can construct an in-vehicle LAN with high durability and reliability. A communication system and an in-vehicle communication control device used for the system can be realized.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration in an embodiment of an in-vehicle device communication system according to the present invention.

FIG. 2 is a block diagram showing a configuration of a communication control device.

FIG. 3 is a block diagram showing a configuration of a wavelength division multiplexing transmission unit.

FIG. 4 is a block diagram showing a configuration of a wavelength multiplexing receiver.

FIG. 5 is a block diagram showing a configuration of an ECU.

FIG. 6 is a schematic diagram for explaining a flow of operations at the time of starting the communication system for an in-vehicle device.

FIG. 7 is a flowchart for explaining a flow of operations when the communication control device performs status management.

FIG. 8 is a flowchart for explaining a flow of operations when data is received from the ECU according to an instruction from the communication control device.

[Explanation of symbols]

1 Communication control device (in-vehicle communication control device) 12a Abnormality detection program 12b Record update program 13 Abnormality record database (Abnormality record DB) 14 WDM transmitter 15 WDM receiver 18 Received frame discrimination section 19 Transmission wavelength selector 2 ECU F management frame

Claims (6)

[Claims] 1. An in-vehicle device communication system for performing optical communication between a plurality of in-vehicle devices included in a vehicle, comprising means for multiplexing information to be transmitted by the optical communication. 2. The apparatus according to claim 1, further comprising means for detecting an abnormal state including an abnormality in which an in-vehicle device cannot operate and an abnormality in which a frequency band used in the optical communication cannot be used. In-vehicle equipment communication system. 3. When the frequency band used in the optical communication detects an abnormal state in which the frequency band is unusable, the device further comprises means for changing the frequency band used in the optical communication to another frequency band. Item 2. The in-vehicle device communication system according to Item 2. 4. An in-vehicle communication control device for controlling optical communication between a plurality of nodes connected to a communication line provided in a vehicle, comprising means for multiplexing information transmitted by the optical communication. In-vehicle communication control device. 5. The apparatus according to claim 4, further comprising means for detecting an abnormal state including an abnormality that a node is inoperable and an abnormality that a frequency band used in the optical communication is unusable. In-vehicle communication control device. 6. The apparatus further comprises means for changing the frequency band used in the optical communication to another frequency band when an abnormal state where the frequency band used in the optical communication is unusable is detected. Item 5. The in-vehicle communication control device according to Item 5.