WO2018051833A1 - Relay device, communication system, transmission method and computer program - Google Patents

Relay device, communication system, transmission method and computer program Download PDF

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Publication number
WO2018051833A1
WO2018051833A1 PCT/JP2017/031826 JP2017031826W WO2018051833A1 WO 2018051833 A1 WO2018051833 A1 WO 2018051833A1 JP 2017031826 W JP2017031826 W JP 2017031826W WO 2018051833 A1 WO2018051833 A1 WO 2018051833A1
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WIPO (PCT)
Prior art keywords
data
transmission
unit
ecu
communication
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PCT/JP2017/031826
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French (fr)
Japanese (ja)
Inventor
知明 吉識
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株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
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Publication of WO2018051833A1 publication Critical patent/WO2018051833A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F8/00—Arrangements for software engineering
    • G06F8/60—Software deployment
    • G06F8/65—Updates
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/44—Star or tree networks

Definitions

  • the present invention relates to a relay device that is connected to a plurality of communication lines and relays communication between two communication devices connected to each of the two communication lines in the plurality of communication lines, and a communication system including the relay device. And a transmission method for transmitting update data for updating the computer program, and a computer program for transmitting the update data.
  • a communication system mounted on a vehicle As a communication system mounted on a vehicle, a communication system including a relay device that is connected to a plurality of communication lines and relays communication between two communication devices connected to two communication lines in the plurality of communication lines (for example, see Patent Document 1).
  • the communication device is an ECU (Electronic Control Unit), and a computer program is stored in the communication device.
  • the communication apparatus has a CPU (Central Processing Unit), and this CPU executes various processes by executing computer programs stored in the communication apparatus.
  • CPU Central Processing Unit
  • the relay apparatus transmits update data for updating the computer program to the communication apparatus via the transmission line that is one of the plurality of communication lines described above.
  • the relay device determines whether the communication load is high for the transmission line.
  • the relay device determines that the communication load of the transmission line is high, for example, when the occupancy ratio of the transmission time during which data is transmitted via the transmission line occupies per unit time is high.
  • the relay device transmits a control command to all the communication devices connected to the transmission line. Thereby, since these communication apparatuses reduce the transmission amount of the data transmitted per unit time via the transmission line, the communication load of the transmission line decreases.
  • the relay apparatus transmits the update data to the communication apparatus that is the update target of the computer program via the transmission line.
  • the data transmitted / received via the transmission line is considered to contain data related to vehicle operation.
  • transmission / reception of data relating to driving of a vehicle is delayed, some control performed in the vehicle may be delayed. For this reason, it is not preferable to reduce the transmission amount per unit time of other data excluding update data.
  • transmission of update data is usually realized by repeatedly transmitting partial data that is a part of update data. In this case, it is not preferable to reduce the transmission amount per unit time of other data excluding partial data.
  • a relay device is a relay device that is connected to a plurality of communication lines and relays communication between two communication devices connected to two communication lines of the plurality of communication lines.
  • a calculation unit that calculates an occupancy ratio of a transmission time during which data is transmitted per unit time for a first communication line that is one of the communication lines, and a computer based on the occupancy ratio calculated by the calculation unit
  • a determination unit that determines a transmission amount per unit time of partial data that is a part of update data for updating a program, and the partial data with the transmission amount per unit time determined by the determination unit.
  • a transmission unit that repeatedly transmits via a communication line.
  • the relay apparatus includes a second calculation unit that calculates an occupancy ratio of a transmission time during which data is transmitted per unit time for the second communication line, and an occupancy calculated by the second calculation unit.
  • a second determination unit that determines a transmission amount per unit time of the partial data based on the rate; and transmission amount data indicating the transmission amount per unit time determined by the second determination unit,
  • a second transmission unit that transmits via a communication line and a reception unit that receives the partial data via the second communication line.
  • the determination unit determines a transmission amount per unit time of the partial data by determining a transmission interval of the partial data, and the transmission unit is determined by the determination unit.
  • the partial data is repeatedly transmitted via the first communication line at a transmission interval.
  • the relay device is characterized in that the calculation of the calculation unit and the determination of the determination unit are performed while the transmission unit repeatedly transmits the partial data.
  • the relay device is characterized in that the transmission unit stops transmission of the partial data while the occupation rate calculated by the calculation unit is equal to or greater than a predetermined rate.
  • a communication system includes the relay device described above and the two communication devices.
  • the transmission method calculates an occupancy ratio of transmission time during which data is transmitted per unit time for a communication line, and updates data for updating a computer program based on the calculated occupancy ratio A transmission amount per unit time of partial data which is a part is determined, and the partial data is repeatedly transmitted via the communication line with the determined transmission amount per unit time.
  • a computer program calculates an occupancy ratio of a transmission time during which data is transmitted per unit time for a communication line, and updates data for updating the computer program based on the calculated occupancy ratio Processing for determining a transmission amount per unit time of partial data as a part and instructing data transmission so that the partial data is repeatedly transmitted via the communication line with the determined transmission amount per unit time Is executed by a computer.
  • the transmission method, and the computer program according to the present invention when the partial data that is a part of the update data of the computer program is repeatedly transmitted via the communication line (first communication line), the communication line
  • the occupancy rate that the transmission time during which data is transmitted occupies per unit time is calculated, and the transmission amount per unit time of the partial data is determined based on the calculated occupancy rate. Thereafter, the partial data is transmitted with the determined transmission amount per unit time.
  • the transmission amount per unit time of partial data is changed based on the occupation rate related to the communication line, and the transmission amount per unit time of other data excluding the partial data is not changed. For this reason, the update data is transmitted without reducing the transmission amount per unit time of other data excluding the partial data.
  • the occupancy ratio of the transmission time during which data is transmitted per unit time is calculated for the second communication line.
  • the transmission amount per unit time of the partial data is determined based on the calculated occupation rate. Thereafter, speed data indicating the determined transmission amount per unit time is transmitted via the second communication line, and partial data is received via the second communication line.
  • the transmission amount per unit time of partial data is changed based on the occupation rate related to the second communication line, and the transmission amount per unit time of other data excluding partial data is not changed. . Therefore, the partial data is received via the second communication line without reducing the transmission amount per unit time of other data excluding the partial data.
  • the transmission amount of partial data per unit time is determined by determining the transmission interval of repeatedly transmitted partial data.
  • the occupation rate is calculated and the transmission interval is determined even while the partial data is repeatedly transmitted. Thereby, the transmission amount per unit time of the partial data is changed even while the partial data is repeatedly transmitted. Even when the occupation rate related to the communication line changes while the partial data is repeatedly transmitted, the transmission amount of the partial data per unit time is changed according to the changed occupation rate.
  • the transmission of partial data is stopped while the occupation rate of the first communication line is equal to or higher than the predetermined rate, the transmission of other data excluding the partial data is adversely affected.
  • the probability of giving is low.
  • the relay device relays communication between two communication devices connected to each of the two communication lines in the plurality of communication lines.
  • the relay device transmits update data via a first communication line that is one of a plurality of communication lines.
  • the update data can be transmitted without reducing the transmission amount per unit time of other data excluding the partial data which is a part of the update data of the computer program.
  • FIG. 1 is a block diagram showing a main configuration of a communication system 1 according to the present embodiment.
  • the communication system 1 includes a relay device 10, four ECUs 11 a, 11 b, 12 a and 12 b, a wireless device 13, two ECU buses 14 a and 14 b, a wireless device bus 15 and a server 16.
  • Relay device 10, ECUs 11 a, 11 b, 12 a, 12 b, wireless device 13, ECU buses 14 a, 14 b and wireless device bus 15 are mounted on vehicle 100.
  • ECU buses 14a and 14b and a radio device bus 15 are connected to the relay device 10 separately.
  • ECUs 11a and 12a are further connected to the ECU bus 14a.
  • ECUs 11b and 12b are further connected to the ECU bus 14b.
  • a wireless device 13 is further connected to the wireless device bus 15.
  • the server 16 is installed outside the vehicle 100 and is connected to an external network N1.
  • Each of the ECUs 11a, 11b, 12a, and 12b controls the operation of the electric device by outputting control data to the electric device connected to the own device.
  • Each of the ECUs 11a, 11b, 12a, and 12b functions as a communication device, and communicates with each other by wire.
  • the relay device 10 relays communication between the ECU connected to the ECU bus 14a, that is, one of the ECUs 11a and 12a, and the ECU connected to the ECU bus 14b, that is, one of the ECUs 11b and 12b. To do.
  • the ECU 12a receives an instruction to lock or unlock the door of the vehicle 100 from the user, and transmits instruction data indicating the received instruction to the relay device 10.
  • the relay device 10 transmits the received instruction data to the ECU 11b connected to the door motor that locks and unlocks the door of the vehicle 100.
  • the ECU 11 a includes an acceleration sensor that detects the acceleration of the vehicle 100, and transmits acceleration data indicating the acceleration detected by the acceleration sensor to the relay device 10.
  • the relay device 10 transmits the received acceleration data to the ECU 12b that controls the operation of the airbag of the vehicle 100.
  • Each of the ECUs 11a, 11b, 12a, and 12b communicates with the wireless device 13 by wire.
  • the relay device 10 relays communication between the ECU connected to the ECU bus 14 a, that is, one of the ECUs 11 a and 12 a, and the wireless device 13 connected to the wireless device bus 15. Further, the relay device 10 relays communication between the ECU connected to the ECU bus 14 b, that is, one of the ECUs 11 b and 12 b, and the wireless device 13 connected to the wireless device bus 15.
  • the wireless device 13 communicates wirelessly with the server 16 via the network N1.
  • the ECU 11a includes a sensor that detects a value such as a speed or acceleration related to traveling of the vehicle, and transmits detection data indicating the detection value detected by the sensor to the relay device 10.
  • the relay device 10 transmits the received detection data to the wireless device 13, and the wireless device 13 transmits the received detection data to the server 16.
  • each of the ECUs 11a, 11b, 12a, and 12b transmits diagnostic data indicating a diagnostic result regarding a failure of the own device or an electric device connected to the own device to the relay device 10.
  • the relay device 10 transmits the received diagnostic data to the wireless device 13, and the wireless device 13 transmits the received diagnostic data to the server 16.
  • the wireless device 13 receives traffic data indicating traffic conditions around the vehicle 100 from the server 16 and transmits the received traffic data to the relay device 10.
  • the relay device 10 transmits the received traffic data to the ECUs 11a and 12a or the ECUs 11b and 12b.
  • each of the ECU buses 14a and 14b functions as a first communication line
  • the wireless device bus 15 functions as a second communication line.
  • a control program is stored in each of the ECUs 11a, 11b, 12a, and 12b (see FIG. 14).
  • a process for controlling the electrical device is executed by executing the control program.
  • the wireless device 13 receives update data for updating a control program stored in one of the ECUs 11a, 11b, 12a, and 12b from the server 16.
  • the wireless device 13 repeatedly transmits partial data, which is a part of the update data received from the server 16, to the relay apparatus 10 via the wireless device bus 15.
  • the relay apparatus 10 receives the update data.
  • the relay device 10 repeatedly transmits partial data that is a part of the update data received from the wireless device 13 via one of the ECU buses 14a and 14b.
  • ECU11a, 12a or ECU11b, 12b receives update data.
  • Each of the ECUs 11a, 11b, 12a, and 12b updates the control program stored in its own device based on the update data received from the relay device 10.
  • Communication via the ECU buses 14a and 14b and the wireless device bus 15 is performed according to a CAN (Controller Area Network) protocol or a CAN-FD (Controller Area Network with Flexible Data Rate) protocol.
  • CAN Controller Area Network
  • CAN-FD Controller Area Network with Flexible Data Rate
  • data transmission is realized by transmitting a data frame including data.
  • Each of the ECU buses 14a and 14b and the radio device bus 15 is constituted by a twisted pair wire.
  • FIG. 2 is an explanatory diagram of a data frame.
  • the data frame includes SOF (Start (Of Frame), arbitration field, control field, data field, CRC (Cyclic Redundancy Check) field, ACK (Acknowledge), and EOF (End Of Frame).
  • SOF Start (Of Frame)
  • CRC Cyclic Redundancy Check
  • ACK Acknowledge
  • EOF End Of Frame
  • the SOF includes information indicating the start of the message.
  • the arbitration field includes identification information for identification and an RTR (Remote Transmission Request) bit.
  • the control field includes information indicating the length of data included in the data field (hereinafter referred to as data length).
  • the unit of data length is byte.
  • the data field includes data indicating the contents to be notified.
  • Each of the instruction data, acceleration data, detection data, diagnosis data, traffic data, and partial data described above is data included in the data field.
  • An upper limit is set for the data length of the data included in the data field.
  • the upper limit value of the data length is, for example, 8 bytes. Therefore, an upper limit is provided for the data length of the partial data, and this upper limit is the upper limit of the data included in the data field.
  • the CRC field includes information indicating a code and a CRC boundary.
  • the ACK is used to confirm whether the message has been correctly received.
  • the EOF includes information indicating the end of the message.
  • Data transmitted from one device connected to the ECU bus 14a via the ECU bus 14a is received by all of the other devices connected to the ECU bus 14a.
  • data transmitted from one device connected to the ECU bus 14b via the ECU bus 14b is received by all the other devices connected to the ECU bus 14b.
  • Data transmitted from one device connected to the wireless device bus 15 via the wireless device bus 15 is received by all of the other devices connected to the wireless device bus 15.
  • the identification information is included in the data frame.
  • arbitration is performed based on identification information data included in the arbitration field of each of a plurality of data frames related to these data. Is done. In arbitration, only one transmission source among a plurality of data frames transmitted at the same time continues transmission, and the transmission sources of other data frames stop transmission.
  • the ECUs 11a, 11b, 12a, 12b and the wireless device 13 receives data by wire, the received data is discarded based on the identification information included in the data frame related to the data. Determine whether or not to do so.
  • the ECUs 11a, 11b, 12a, 12b and the wireless device 13 each determine that the data should be discarded, the received data is discarded when it is determined that the received data should be discarded and the data should not be discarded. The process which concerns on is performed.
  • ECU11a, 11b, 12a, 12b each determines whether the received partial data should be discarded, when partial data is received. When each of the ECUs 11a, 11b, 12a, and 12b determines that the received partial data should not be discarded, the ECU 11a, 11b, 12a, and 12b stores the received partial data. When each of the ECUs 11a, 11b, 12a, and 12b stores all partial data, that is, update data, the ECU 11a, 11b, 12a, and 12b updates the control program based on the update data.
  • FIG. 3 is a block diagram showing a main configuration of the wireless device 13.
  • the wireless device 13 includes a wireless communication unit 20, a wired communication unit 21, a timer 22, a storage unit 23, and a control unit 24. These are connected to the bus 25 separately.
  • the wired communication unit 21 is further connected to the wireless device bus 15.
  • the wireless communication unit 20 wirelessly receives data from the server 16 via the network N1.
  • the update data is one of data received by the wireless communication unit 20.
  • the wireless communication unit 20 transmits data to the server 16 wirelessly in accordance with an instruction from the control unit 24.
  • the wired communication unit 21 receives data from the relay device 10 via the wireless device bus 15.
  • the wired communication unit 21 transmits data to the relay device 10 in accordance with an instruction from the control unit 24.
  • the partial data that is a part of the update data is one of the data transmitted by the wired communication unit 21.
  • the timer 22 starts and ends timing in accordance with instructions from the control unit 24. The time measured by the timer 22 is read by the control unit 24.
  • the storage unit 23 is, for example, a nonvolatile memory.
  • the storage unit 23 stores a control program P1.
  • the control unit 24 has a CPU (not shown).
  • the CPU of the control unit 24 executes a data transmission process, a wireless transmission process, an update data transmission process, and the like by executing the control program P1.
  • the control program P1 is a computer program for causing the CPU of the control unit 24 to execute data transmission processing, wireless transmission processing, and update data processing.
  • the control program P1 may be stored in the storage medium A1 so that the computer can read it.
  • the control program P1 read from the storage medium A1 by a reading device (not shown) is stored in the storage unit 23.
  • the storage medium A1 is an optical disk, a flexible disk, a magnetic disk, a magnetic optical disk, a semiconductor memory, or the like.
  • the optical disc is a CD (Compact Disc) -ROM (Read Only Memory), a DVD (Digital Versatile Disc) -ROM, or a BD (Blu-ray (registered trademark) Disc).
  • the magnetic disk is, for example, a hard disk.
  • the control program P1 may be downloaded from an external device (not shown) connected to a communication network (not shown), and the downloaded control program P1 may be stored in the storage unit 23.
  • the control unit 24 performs data transmission processing, wireless transmission processing, and update data transmission processing in a time division manner. Therefore, the control unit 24 executes another process while waiting in one process. For example, the control unit 24 executes the data transmission process while waiting in the update data transmission process.
  • the data transmission process is a process for transmitting other data, excluding partial data, which is a part of the update data, via the wireless device bus 15.
  • the control unit 24 executes data transmission processing when the wireless communication unit 20 receives other data excluding partial data.
  • the control unit 24 instructs the wired communication unit 21 to transmit the data received by the wireless communication unit 20 to the relay device 10. Thereafter, the control unit 24 ends the data transmission process.
  • the wireless transmission process is a process for transmitting data to the server 16 wirelessly.
  • the control unit 24 performs wireless transmission processing.
  • the control unit 24 determines whether or not the data received by the wired communication unit 21 should be discarded based on the identification information included in the data frame of the data received by the wired communication unit 21.
  • the control unit 24 discards this data and ends the wireless transmission process.
  • the control unit 24 instructs the wireless communication unit 20 to transmit the data to the server 16 wirelessly, and ends the wireless transmission process.
  • the update data transmission process is a process for transmitting update data via the radio bus 15.
  • FIG. 4 is a flowchart showing a procedure of update data transmission processing of the wireless device 13.
  • the control unit 24 executes update data transmission processing when the wireless communication unit 20 receives update data.
  • the storage unit 23 includes a wireless device transmission interval that is a time interval at which the wired communication unit 21 transmits partial data, a wireless device transmission number that is the number of times the partial data is transmitted, and a first threshold value related to the wireless device transmission number. Is stored.
  • the first threshold value is a constant value and is a natural number.
  • the control unit 24 instructs the wired communication unit 21 to transmit request data for requesting notification of the wireless device transmission interval (step S1). Thereby, the wired communication unit 21 transmits the request data to the relay device 10.
  • the relay device 10 receives the request data from the wired communication unit 21, the relay device 10 transmits response data indicating that the wireless device transmission interval or update data cannot be transmitted.
  • step S1 the control unit 24 determines whether the wired communication unit 21 has received response data from the relay device 10 (step S2). When it is determined that the wired communication unit 21 has not received the response data (S2: NO), the control unit 24 executes Step S2 again and waits until the wired communication unit 21 receives the response data.
  • the control unit 24 determines whether the response data received by the wired communication unit 21 indicates that transmission is not possible (step S3). When it is determined that the response data indicates that transmission is not possible (S3: YES), the control unit 24 executes Step S1. Here, the control unit 24 executes Step S1 after a predetermined time has elapsed since it was determined that the response data indicates that transmission is not possible. The control unit 24 repeatedly transmits the request data until the wired communication unit 21 receives response data indicating that transmission is not possible, that is, response data indicating the wireless device transmission interval.
  • the wireless device transmission interval stored in the storage unit 23 indicates the wireless transmission interval indicated by the response data received by the wired communication unit 21.
  • the transmitter transmission interval is changed (step S4), and the number of radio transmissions stored in the storage unit 23 is set to zero (step S5).
  • control unit 24 instructs the timer 22 to start timing (step S6), and instructs the wired communication unit 21 to transmit partial data (step S7).
  • the wired communication unit 21 transmits the partial data to the relay device 10 via the wireless device bus 15.
  • control unit 24 increments the number of radio transmissions stored in the storage unit 23 by 1 (step S8), and determines whether or not transmission of update data, that is, all partial data has been completed. (Step S9).
  • the control unit 24 determines that the transmission of the update data has not been completed (S9: NO)
  • the time measured by the timer 22 is the radio transmission interval stored in the storage unit 23, that is, It is determined whether the response data received by the wired communication unit 21 is equal to or longer than the wireless device transmission interval (step S10).
  • Step S10 When it is determined that the timed time is less than the wireless device transmission interval (S10: NO), the control unit 24 executes Step S10 again and waits until the timed time becomes equal to or longer than the wireless device transmission interval.
  • the control unit 24 instructs the timer 22 to end the time measurement (step S11), and the wireless device stored in the storage unit 23 It is determined whether or not the number of transmissions is the first threshold (step S12).
  • the control unit 24 executes Step S6.
  • the control unit 24 instructs the wired communication unit 21 to repeatedly transmit the partial data at the wireless device transmission interval until the transmission of the update data is completed or the wireless device transmission count reaches the first threshold value.
  • the control unit 24 executes Step S1 again.
  • the wired communication unit 21 again transmits the request data to the relay device 10 and receives response data indicating the wireless device transmission interval from the relay device 10.
  • the wired communication unit 21 repeatedly transmits the partial data at the wireless device transmission interval indicated by the newly received response data.
  • the control unit 24 instructs the timer 22 to finish timing (step S13), and the wired communication unit 21 has completed the transmission of the update data. This is instructed to transmit completion data indicating this (step S14). Thereby, the wired communication unit 21 transmits the completion data to the relay device 10 via the wireless device bus 15 and notifies the relay device 10 of the completion of transmission of the update data. After executing Step S14, the control unit 24 ends the update data transmission process.
  • FIG. 5 is an explanatory diagram of transmission of update data from the wireless device 13 to the relay device 10.
  • an example of transmission of update data when the first threshold is 3 is shown.
  • the wired communication unit 21 of the wireless device 13 transmits request data to the relay device 10 and sets the number of times the wireless device has been transmitted to zero. .
  • the wired communication unit 21 receives the response data from the relay device 10 and repeatedly transmits the partial data at the wireless device transmission interval indicated by the received response data.
  • the control unit 24 increments the wireless device transmission count by 1 each time the partial data is transmitted.
  • the wired communication unit 21 transmits the request data again and receives the response data from the relay device 10 when the wireless device transmission count reaches the first threshold, that is, 3. At this time, the control unit 24 sets the number of radio transmissions to zero.
  • the wired communication unit 21 repeatedly transmits partial data to the relay device 10 at the wireless transmission interval indicated by the response data newly received from the relay device 10.
  • the wired communication unit 21 each time the wireless device transmission count becomes the first threshold, the wired communication unit 21 newly receives response data from the relay device 10 and performs partial data transmission at the wireless device transmission interval indicated by the newly received response data. Is sent repeatedly. As described above, an upper limit is set for the data length of the partial data. The data length of the other partial data except the partial data transmitted last among all the partial data constituting the update data is an upper limit value and is constant.
  • the wired communication unit 21 transmits the completion data to the relay device 10 and notifies the relay device 10 of the completion of the update data transmission. The radio transmission interval will be described later.
  • FIG. 6 is a block diagram illustrating a configuration of a main part of the relay device 10.
  • the relay device 10 includes a first timer 30, two second timers 31a and 31b, two transmission timers 32a and 32b, a first communication unit 33, two second communication units 34a and 34b, a storage unit 35, and a control unit 36. Have These are connected to the bus 37 separately.
  • the first communication unit 33 is further connected to the radio bus 15.
  • the second communication unit 34a is further connected to the ECU bus 14a.
  • the second communication unit 34b is further connected to the ECU bus 14b.
  • the first timer 30, the second timers 31a and 31b, and the transmission timers 32a and 32b each start and end timing according to instructions from the control unit 36.
  • the time measured by each of the first timer 30, the second timers 31a and 31b, and the transmission timers 32a and 32b is read by the control unit 36.
  • the first communication unit 33 receives data from the wired communication unit 21 of the wireless device 13 via the wireless device bus 15.
  • the partial data that is a part of the update data is one of the data received by the first communication unit 33.
  • the first communication unit 33 transmits data to the wired communication unit 21 of the wireless device 13 via the wireless device bus 15 in accordance with an instruction from the control unit 36.
  • the first communication unit 33 functions as a receiving unit.
  • the second communication unit 34a receives data transmitted from the ECUs 11a and 12a via the ECU bus 14a.
  • the second communication unit 34a transmits data to the ECUs 11a and 12a via the ECU bus 14a in accordance with instructions from the control unit 36.
  • the partial data is one of data transmitted by the second communication unit 34a.
  • the second communication unit 34b receives data transmitted from the ECUs 11b and 12b via the ECU bus 14b.
  • the second communication unit 34b transmits data to the ECUs 11b and 12b via the ECU bus 14b in accordance with an instruction from the control unit 36.
  • the partial data is one of data transmitted by the second communication unit 34b.
  • the storage unit 35 is, for example, a nonvolatile memory.
  • the storage unit 35 stores a control program P2.
  • the control unit 36 has a CPU (not shown).
  • the control unit 36 executes the control program P2 stored in the storage unit 35, thereby performing relay processing, calculation processing of the radio equipment bus occupancy, calculation processing of the ECU bus occupancy relating to each of the ECU buses 14a and 14b, A response process for the request data and an update data transmission process for transmitting the update data via the ECU buses 14a and 14b are executed.
  • the radio device bus occupancy rate is an occupancy rate of the radio device bus 15 occupying the transmission time during which transmission is performed per unit time.
  • the ECU bus occupation ratio related to the ECU bus 14a is an occupation ratio of the transmission time during which transmission is performed with respect to the ECU bus 14a per unit time.
  • the ECU bus occupation ratio relating to the ECU bus 14b is an occupation ratio indicating the transmission time during which transmission is performed for the ECU bus 14b per unit time. These occupancy units are in percent (%).
  • the control program P2 is connected to the CPU of the control unit 36 by relay processing, calculation processing of the radio bus occupancy, calculation processing of the ECU bus occupancy relating to each of the ECU buses 14a and 14b, response processing to the request data, and ECU bus 14 is a computer program for executing update data transmission processing for transmitting update data via 14a and 14b, respectively.
  • the control program P2 may be stored in the storage medium A2 so that the computer can read it.
  • the control program P2 read from the storage medium A2 by a reading device (not shown) is stored in the storage unit 35.
  • the storage medium A2 is an optical disk, a flexible disk, a magnetic disk, a magnetic optical disk, a semiconductor memory, or the like.
  • the control program P2 may be downloaded from an external device (not shown) connected to a communication network (not shown), and the downloaded control program P2 may be stored in the storage unit 35.
  • the control unit 36 performs relay processing, radio device bus occupancy rate calculation processing, ECU bus occupancy rate calculation processing, response processing, and update data transmission processing for each of the ECU buses 14a and 14b in a time-sharing manner. Therefore, the control unit 36 executes another process while waiting in one process.
  • the relay processing includes communication between one of the ECUs 11a and 12a and one of the ECUs 11b and 12b, communication between one of the ECUs 11a and 12a and the wireless device 13, and wireless communication with one of the ECUs 11b and 12b. This is a process for relaying communication with the device 13.
  • the control unit 36 performs relay processing when the first communication unit 33 receives other data excluding partial data, or when one of the second communication units 34a and 34b receives data.
  • the control unit 36 When the first communication unit 33 receives other data excluding partial data from the wireless device 13, in the relay process, the control unit 36 includes identification information included in the data frame of the data received by the first communication unit 33. Based on the above, it is determined whether or not the data received by the first communication unit 33 should be discarded. When it is determined that the data received by the first communication unit 33 should be discarded, the control unit 36 discards this data and ends the relay process. When it is determined that the data received by the first communication unit 33 should not be discarded, the control unit 36 determines whether the data in the second communication units 34a and 34b is based on the identification information included in the data frame of this data. One or both are selected and the selected communication unit is instructed to transmit the data received by the first communication unit 33.
  • the control unit 36 adds the data frame of the data received by the second communication unit 34a. Based on the included identification information, it is determined whether or not the data received by the second communication unit 34a should be discarded. When it is determined that the data received by the second communication unit 34a should be discarded, the control unit 36 discards the data and ends the relay process. When the control unit 36 determines that the data received by the second communication unit 34a should not be discarded, the first communication unit 33 and the second communication are based on the identification information included in the data frame of the data. One or both of the units 34b are selected, and the selected communication unit is instructed to transmit the data received by the second communication unit 34a.
  • the control unit 36 transmits the data received by the second communication unit 34b. Based on the identification information included in the data frame, it is determined whether or not the data received by the second communication unit 34b should be discarded. When it is determined that the data received by the second communication unit 34b should be discarded, the control unit 36 discards this data and ends the relay process. When the control unit 36 determines that the data received by the second communication unit 34b should not be discarded, the control unit 36 performs the first communication unit 33 and the second communication based on the identification information included in the data frame of this data. One or both of the units 34a are selected, and the selected communication unit is instructed to transmit the data received by the second communication unit 34b.
  • FIG. 7 is a flowchart showing the procedure of the wireless device bus occupation rate calculation process.
  • the control unit 36 periodically executes the wireless device bus occupancy rate calculation process.
  • the storage unit 35 stores the wireless device bus occupancy rate and the wireless device transmission time indicating the transmission time during which data is transmitted for the wireless device bus 15.
  • the control unit 36 sets the wireless device transmission time stored in the storage unit 35 to zero (step S21), and instructs the first timer 30 to start measuring time ( Step S22).
  • the control unit 36 determines whether data transmission or reception has been executed by the first communication unit 33 (step S23).
  • the control unit 36 reads the data length from the information included in the control field of the data frame used in the data transmission or reception (step S23).
  • S24 The frame length of the data frame corresponding to the read data length is read from the storage unit 35 (step S25). In step S25, the frame length may be calculated by substituting the data length read in step S24 into an arithmetic expression.
  • FIG. 8 is a chart showing the relationship between data length and frame length.
  • the storage unit 35 stores the relationship between the data length and the frame length as shown in FIG.
  • the unit of the data length is bytes as described above.
  • the unit of the frame length is seconds.
  • the frame length of the data frame whose data length is zero bytes is T0
  • the frame length of the data frame whose data length is 1 byte is T1
  • the frame length is T2.
  • the control unit 36 reads the frame length corresponding to the data length read in step S24.
  • the frame length T0 is the shortest, and the frame length is longer in the order of T0, T1, T2,.
  • the control unit 36 calculates the radio transmission time stored in the storage unit 35 by adding the frame length read in step S25 to the radio transmission time currently stored.
  • the transmission time is changed (step S26).
  • the control unit 36 determines that the data transmission and reception are not executed (S23: NO), or after executing step S26, the time measured by the first timer 30 is not less than the reference time. It is determined whether or not there is (step S27).
  • the reference time is a constant value and is stored in the storage unit 35 in advance.
  • the control part 36 performs step S23, when it determines with time keeping time being less than reference
  • the control unit 36 calculates the radio transmission time by adding the frame lengths of all data frames transmitted and received by the first communication unit 33 until the time measured by the first timer 30 becomes the reference time. As described above, the data transmitted by one device connected to the radio bus 15 is received by all of the other devices connected to the radio bus 15. Therefore, the radio transmission time can be calculated by adding the frame lengths of all data frames transmitted and received by the first communication unit 33.
  • the control unit 36 instructs the first timer 30 to end the time measurement (step S28), and the wireless device stored in the storage unit 35 is stored.
  • the radio bus occupation ratio is calculated by dividing the product of the transmission time and 100 by the reference time (step S29).
  • the control unit 36 changes the wireless device bus occupancy rate stored in the storage unit 35 to the wireless device bus occupancy rate calculated in step S29 (step S30), and performs the wireless device bus occupancy rate calculation process. finish.
  • the control unit 36 executes the ECU bus occupancy calculation processing for the ECU buses 14a and 14b in the same manner as the radio device bus occupancy calculation processing.
  • the storage unit 35 stores an ECU bus occupation rate relating to each of the ECU buses 14a and 14b and an ECU transmission time indicating a transmission time during which data is transmitted for each of the ECU buses 14a and 14b.
  • the radio equipment bus 15, the first timer 30, the first communication unit 33, the radio equipment transmission time, and the radio equipment bus occupancy ratio are respectively represented as an ECU bus 14a, a second timer 31a, The second communication unit 34a, the ECU transmission time related to the ECU bus 14a, and the ECU bus occupation rate related to the ECU bus 14a are replaced. Thereby, the calculation process of the ECU bus occupancy rate related to the ECU bus 14a can be described.
  • the wireless device bus 15, the first timer 30, the first communication unit 33, the wireless device transmission time, and the wireless device bus occupancy rate are respectively represented by the ECU bus 14 b,
  • the timer 31b, the second communication unit 34b, the ECU transmission time related to the ECU bus 14b, and the ECU bus occupation ratio related to the ECU bus 14b are replaced.
  • the ECU bus occupancy rate calculation process related to the ECU bus 14b can be described.
  • the ECU bus occupancy rate calculation process related to each of the ECU buses 14a and 14b is periodically executed in the same manner as the wireless device bus occupancy rate calculation process. For this reason, the radio device bus occupation ratio and the two ECU bus occupation ratios stored in the storage unit 35 are changed over time.
  • the control unit 36 functions as a calculation unit and a second calculation unit.
  • FIG. 9 is a flowchart showing the procedure of response processing.
  • the control unit 36 executes response processing when the first communication unit 33 receives request data from the wired communication unit 21 of the wireless device 13.
  • the control unit 36 reads out the wireless device bus occupancy rate stored in the storage unit 35 (step S31), and whether or not the read out wireless device bus occupancy rate is less than a first reference rate, for example, 50%. Is determined (step S32).
  • the first reference rate is a constant value and is stored in advance in the storage unit 35.
  • the control unit 36 determines the wireless device transmission interval based on the wireless device bus occupancy read in step S31 (step S31). S33).
  • the data length of the other partial data excluding the partial data transmitted last among all the partial data constituting the update data is the upper limit value and is constant. Therefore, the shorter the wireless transmission interval, the larger the transmission amount per unit time of the partial data transmitted by the wired communication unit 21 of the wireless device 13. For this reason, the transmission amount per unit time of the partial data is determined by determining the radio transmission interval in step S33.
  • the control unit 36 also functions as a second determination unit.
  • FIG. 10 is a chart showing the relationship between the wireless device bus occupation ratio and the transmission interval.
  • the storage unit 35 stores the relationship between the radio bus occupancy and the transmission interval as shown in FIG.
  • the transmission interval E0 corresponds to the radio equipment bus occupation ratio that is 0% or more and less than 10%.
  • a transmission interval E1 that is longer than the transmission interval E0 corresponds to a radio bus occupation ratio that is 10% or more and less than 20%.
  • a transmission interval E2 longer than the transmission interval E1 corresponds to a radio bus occupation ratio of 20% or more and less than 30%.
  • a transmission interval E3 longer than the transmission interval E2 corresponds to a radio bus occupation ratio of 30% or more and less than 40%.
  • a transmission interval E4 longer than the transmission interval E3 corresponds to a radio bus occupancy rate of 40% or more and less than 50%.
  • the first reference rate is 50%.
  • step S33 the control unit 36 determines the radio transmission interval to be a transmission interval corresponding to the radio bus occupancy read in step S31.
  • the wireless device transmission interval is determined as the transmission interval E1.
  • the control unit 36 calculates the transmission interval by substituting the wireless device bus occupancy read in step S31 into the arithmetic expression, and determines the wireless device transmission interval as the calculated transmission interval. Good.
  • the control unit 36 instructs the first communication unit 33 to transmit response data indicating the radio transmission interval determined in step S33 (step S34).
  • the first communication unit 33 transmits response data indicating the wireless transmission interval determined by the control unit 36 in step S33 to the wired communication unit 21 of the wireless device 13.
  • the transmission amount per unit time of the partial data is determined by determining the radio transmission interval.
  • transmitting the response data indicating the radio transmission interval determined in step S33 by the control unit 36 means transmitting response data indicating the transmission amount per unit time determined by the control unit 36 in step S33.
  • the first communication unit 33 also functions as a second transmission unit.
  • the response data indicating the radio transmission interval corresponds to transmission amount data.
  • the control unit 36 instructs the wired communication unit 21 to transmit response data indicating that transmission is not possible. Thereby, the wired communication unit 21 transmits response data indicating that transmission is impossible to the wireless device 13. After executing one of steps S34 and S35, the controller 36 ends the response process.
  • the first communication unit 33 when the first communication unit 33 receives the request data from the wired communication unit 21 of the wireless device 13 and the wireless device bus occupancy is less than the first reference rate, the first communication unit 33 is wireless. Response data indicating the transmitter transmission interval is transmitted.
  • the radio transmission interval is shorter as the radio bus occupancy is smaller. For this reason, as shown in FIG. 5, when the wireless device bus occupancy is small, the wired communication unit 21 of the wireless device 13 repeatedly transmits partial data at short wireless device transmission intervals, and when the wireless device bus occupancy is large, The wired communication unit 21 repeatedly transmits partial data at long wireless transmission intervals.
  • the wireless device bus occupancy rate calculation process and the response process are performed in a time division manner.
  • the calculation of the wireless device bus occupancy rate and the determination of the wireless device transmission interval are not only performed before the wired communication unit 21 of the wireless device 13 starts transmitting the partial data, but the wired communication unit 21 repeats the partial data. This is also done while sending.
  • the wireless device transmission interval that is, the transmission amount of the partial data per unit time is , Changed according to the changed radio bus occupancy.
  • the radio transmission interval that is, the transmission amount per unit time of partial data is changed, and the radio bus 15 changes the transmission amount per unit time of other data excluding partial data never do. For this reason, the 1st communication part 33 of the relay apparatus 10 can receive partial data, without reducing the transmission amount per unit time of the other data except partial data.
  • the partial data is transmitted at a short transmission interval, and the vehicle 100 travels. Therefore, when the transmission amount per unit time of other data excluding the partial data increases, the partial data is transmitted at a long transmission interval.
  • FIG. 11 is a flowchart showing a procedure of update data transmission processing of the relay device 10.
  • FIG. 11 shows an update data transmission process for transmitting update data via the ECU bus 14a.
  • the control unit 36 performs update data transmission processing when the first communication unit 33 receives partial data that is a part of update data related to one control program in the ECUs 11a and 12a from the wired communication unit 21 of the wireless device 13.
  • the storage unit 35 includes an ECU transmission interval, which is a time interval at which the second communication unit 34a transmits partial data, an ECU transmission count at which the second communication unit 34a transmits partial data, and an ECU transmission of the second communication unit 34a.
  • a second threshold value related to the number of times is stored.
  • the second threshold value is a constant value and is a natural number.
  • the control unit 36 reads the ECU bus occupancy relating to the ECU bus 14a from the storage unit 35 (step S41), and determines whether or not the read ECU bus occupancy is less than a second reference rate, for example, 40% ( Step S42).
  • the second reference rate is a constant value and is stored in the storage unit 35 in advance.
  • control unit 36 executes step S41.
  • the control unit 36 executes step S41 after a predetermined time has elapsed since it was determined that the ECU bus occupancy is equal to or higher than the second reference rate.
  • the control unit 36 stands by until the ECU bus occupation rate related to the ECU bus 14a becomes less than the second reference rate.
  • the control unit 36 determines the ECU transmission interval of the second communication unit 34a based on the ECU bus occupancy rate read in step S41. Determine (step S43).
  • the data length of the other partial data except the partial data transmitted last among all the partial data constituting the update data is an upper limit value and is constant. Accordingly, the shorter the ECU transmission interval of the second communication unit 34a, the larger the transmission amount per unit time of the partial data transmitted by the second communication unit 34a. For this reason, the transmission amount per unit time of the partial data is determined by determining the ECU transmission interval of the second communication unit 34a in step S43.
  • the control unit 36 also functions as a determination unit.
  • FIG. 12 is a chart showing the relationship between the ECU bus occupation ratio and the transmission interval.
  • the storage unit 35 stores the relationship between the ECU bus occupation ratio and the transmission interval as shown in FIG.
  • the transmission interval G0 corresponds to the ECU bus occupation ratio that is 0% or more and less than 10%.
  • a transmission interval G1 longer than the transmission interval G0 corresponds to an ECU bus occupancy rate of 10% or more and less than 20%.
  • a transmission interval G2 that is longer than the transmission interval G1 corresponds to an ECU bus occupation ratio that is 20% or more and less than 30%.
  • a transmission interval G3 longer than the transmission interval G2 corresponds to an ECU bus occupancy rate of 30% or more and less than 40%.
  • the second reference rate is 40%.
  • step S43 the control unit 36 determines the ECU transmission interval as a transmission interval corresponding to the ECU bus occupation rate read in step S41.
  • the ECU transmission interval is determined as the transmission interval G2.
  • the control unit 36 calculates the transmission interval by substituting the ECU bus occupancy read in step S41 into the arithmetic expression, and sets the ECU transmission interval of the second communication unit 34a to the calculated transmission interval. You may decide.
  • control unit 36 changes the ECU transmission interval of the second communication unit 34a stored in the storage unit 35 to the ECU transmission interval determined in step S43 (step S44).
  • control unit 36 sets the number of ECU transmissions of the second communication unit 34a to zero (step S45), instructs the transmission timer 32a to start measuring time (step S46), and causes the second communication unit 34a to Data transmission is instructed (step S47).
  • the 2nd communication part 34a transmits partial data to ECU11a, 12a.
  • One of the ECUs 11a and 12a discards the received partial data, and the other of the ECUs 11a and 12a stores the received partial data.
  • control unit 36 increments the ECU transmission count of the second communication unit 34a stored in the storage unit 35 by 1 (step S48), and whether update data, that is, transmission of all partial data has been completed. It is determined whether or not (step S49).
  • the control unit 36 determines that the transmission of the update data is not completed (S49: NO)
  • the time measured by the transmission timer 32a is the ECU transmission interval stored in the storage unit 35, that is, It is determined whether or not it is equal to or longer than the ECU transmission interval determined in step S43 (step S50).
  • step S50 When it is determined that the timed time is less than the ECU transmission interval (S50: NO), the control unit 36 executes step S50 again and waits until the timed time becomes equal to or longer than the ECU transmission interval.
  • the control unit 36 instructs the transmission timer 32a to end the time measurement (step S51), and transmits the ECU transmission stored in the storage unit 35. It is determined whether or not the number of times is the second threshold (step S52).
  • Step S46 When it is determined that the ECU transmission frequency is not the second threshold value, that is, the ECU transmission frequency is less than the second threshold value (S52: NO), the control unit 36 executes Step S46.
  • the control unit 36 instructs the second communication unit 34a to repeatedly transmit the partial data at the ECU transmission count until the transmission of the update data is completed or the ECU transmission count reaches the second threshold value.
  • the control unit 36 executes Step S41 again.
  • the second communication unit 34a executes step S43 again when the ECU bus occupancy rate related to the ECU bus 14a is less than the second reference rate, and the second communication unit 34a re-executes the ECU transmission interval newly determined in step S43. Send partial data repeatedly.
  • step S53 the control unit 36 instructs the transmission timer 32a to end the time measurement (step S53), and the second communication unit 34a transmits the update data.
  • step S54 The transmission of completion data indicating completion is instructed (step S54).
  • the second communication unit 34a transmits the completion data to the ECUs 11a and 12a via the ECU bus 14a, and notifies the ECU that stores the partial data in the ECUs 11a and 12a of the completion of transmission of the update data. .
  • step S54 the control unit 36 ends the update data transmission process.
  • the control unit 36 executes an update data transmission process for transmitting update data via the ECU bus 14b in the same manner as an update data transmission process for transmitting update data via the ECU bus 14a.
  • the update data transmission process for transmitting update data via the ECU bus 14a the ECUs 11a and 12a, the ECU bus 14a, the transmission timer 32a, and the second communication unit 34a are respectively connected to the ECUs 11b and 12b, the ECU bus 14b, and the transmission. It replaces with the timer 32b and the 2nd communication part 34b. Thereby, the update data transmission process for transmitting the update data via the ECU bus 14b can be described.
  • FIG. 13 is an explanatory diagram of transmission of update data from the relay device 10 to the ECUs 11a and 12a.
  • an example of transmission of update data when the second threshold value related to the number of times of ECU transmission of the second communication unit 34a is 3 is shown.
  • the ECU transmission interval of the second communication unit 34a corresponds to the ECU bus occupation ratio related to the ECU bus 14a. Determine the transmission interval.
  • the second communication unit 34a repeatedly transmits the partial data at the ECU transmission interval determined by the control unit 36, that is, the transmission amount per unit time determined by the control unit 36.
  • the control unit 36 instructs the transmission of the partial data so that the second communication unit 34a repeatedly transmits the partial data at the determined ECU transmission interval.
  • the second communication unit 34a functions as a transmission unit.
  • the control unit 36 increments the ECU transmission count of the second communication unit 34a by 1 each time the partial data is transmitted.
  • the control unit 36 again reads the ECU transmission interval of the second communication unit 34a corresponding to the ECU bus occupancy relating to the ECU bus 14a, and performs the second communication.
  • the number of ECU transmissions of the unit 34a is set to zero.
  • the second communication unit 34a repeatedly transmits the partial data to the ECUs 11a and 12a at the ECU transmission interval newly determined by the control unit 36.
  • the control unit 36 corresponds to the ECU bus occupation ratio related to the ECU bus 14a.
  • the second communication unit 34a determines the ECU transmission interval of the second communication unit 34a, and the second communication unit 34a repeatedly transmits the partial data at the ECU transmission interval determined by the control unit 36. Further, as described above, the ECU bus occupancy calculation process for the ECU bus 14a and the update data transmission process for transmitting update data via the ECU bus 14a are performed in a time-sharing manner.
  • the calculation of the ECU bus occupancy ratio related to the ECU bus 14a and the determination of the ECU transmission interval transmitted by the second communication unit 34a are not only before the second communication unit 34a starts transmitting the partial data, This is also performed while the communication unit 34a repeatedly transmits partial data.
  • the ECU transmission interval that is, the transmission amount of the partial data per unit time is It is changed according to the changed ECU bus occupation rate.
  • the second communication unit 34a transmits the completion data to the ECUs 11a and 12a, and notifies the ECU that stores the partial data in the ECUs 11a and 12a of the completion of the transmission of the update data.
  • the second communication unit 34a when the ECU bus occupancy associated with the ECU bus 14a is small, the second communication unit 34a repeatedly transmits partial data at short ECU transmission intervals. When the ECU bus occupation ratio related to the ECU bus 14a is large, the second communication unit 34a repeatedly transmits partial data at a long ECU transmission interval.
  • the ECU transmission interval of the second communication unit 34a that is, the transmission amount per unit time of the partial data is changed based on the ECU bus occupation ratio related to the ECU bus 14a.
  • the transmission amount per unit time of other data other than is not changed. For this reason, update data is transmitted to ECU11a, 12a, without reducing the transmission amount per unit time of other data except partial data.
  • the partial data is transmitted at a short transmission interval, and the vehicle 100 travels. Therefore, when the transmission amount per unit time of other data excluding the partial data increases, the partial data is transmitted at a long transmission interval.
  • the second communication unit 34a stops transmitting the partial data. For this reason, in the ECU bus 14a, the probability of adversely affecting the transmission of other data excluding partial data is low. Update data from the relay device 10 to the ECUs 11b and 12b is also transmitted in the same manner as update data from the relay device 10 to the ECUs 11a and 12a. Accordingly, the second communication unit 34b also functions as a transmission unit.
  • FIG. 14 is a block diagram showing a main configuration of the ECU 11a.
  • the ECU 11 a includes an output unit 40, a communication unit 41, a storage unit 42, and a control unit 43. These are connected to the bus 44 separately.
  • the output unit 40 is further connected to an electric device corresponding to the ECU 11a.
  • the communication unit 41 is further connected to the ECU bus 14a.
  • the output unit 40 outputs control data to the electrical device in accordance with an instruction from the control unit 43.
  • the electric device performs an operation according to the control data input from the communication unit 41.
  • the communication unit 41 receives data from the second communication unit 34a and the ECU 12a of the relay device 10 via the ECU bus 14a.
  • the partial data is one of data that the communication unit 41 receives from the second communication unit 34a.
  • the communication unit 41 transmits the data to the second communication unit 34a and the ECU 12a of the relay device 10 according to the instruction of the control unit 43.
  • the storage unit 42 is, for example, a nonvolatile memory.
  • the storage unit 42 stores a control program P3 and an update program P4.
  • the control unit 43 has a CPU (not shown).
  • the CPU of the control unit 43 stores the control process for controlling the operation of the electrical equipment connected to the output unit 40 and the partial data received by the communication unit 41 in the storage unit 42 by executing the control program P3.
  • the control program P3 is a computer program for causing the CPU of the control unit 43 to execute control processing and storage processing.
  • the control unit 43 instructs the output unit 40 to control the operation of the electric device by causing the electric device to output control data.
  • the control unit 43 performs storage processing when the communication unit 41 receives partial data.
  • the control unit 43 determines whether or not the partial data received by the communication unit 41 should be discarded based on the identification information included in the data frame of the partial data received by the communication unit 41.
  • the control unit 43 discards the partial data.
  • the control unit 43 stores the partial data in the storage unit 42.
  • the control unit 43 executes the update program P4 when update data, that is, all partial data is stored in the storage unit 42, and executes update processing of the control program P3.
  • the update program P4 is a computer program for causing the CPU of the control unit 43 to execute update processing of the control program P3.
  • the control unit 43 updates the control program P3 based on the update data stored in the storage unit 42.
  • the ECUs 11b, 12a, and 12b are each configured in the same manner as the ECU 11a.
  • the configuration of the ECU 12a can be described by replacing the ECUs 11a and 12a with the ECUs 12a and 11a, respectively.
  • the configuration of the ECU 11b will be described by replacing the ECUs 11a and 12a, the ECU bus 14a, and the second communication unit 34a with the ECUs 11b, 12b, the ECU bus 14b, and the second communication unit 34b, respectively. Can do.
  • the configuration of the ECU 12b will be described by replacing the ECUs 11a, 12a, the ECU bus 14a, and the second communication unit 34a with the ECUs 12b, 11b, the ECU bus 14b, and the second communication unit 34b, respectively. Can do.
  • the configuration for determining the transmission amount of partial data per unit time for each of the ECU buses 14a and 14b is not limited to the configuration for determining the ECU transmission interval. Directly, the transmission amount of the partial data per unit time may be determined.
  • the configuration for determining the transmission amount of partial data per unit time is not limited to the configuration for determining the wireless device transmission interval. Directly, the transmission amount of the partial data per unit time may be determined.
  • the timing at which one of the second communication units 34a and 34b of the relay device 10 starts transmission of partial data may be before the first communication unit 33 completes reception of all partial data, It may be after the 1st communication part 33 completes reception of all the partial data.
  • the number of update data that the wireless communication unit 20 of the wireless device 13 receives from the server 16 at a time is not limited to one and may be two or more.
  • the wireless communication unit 20 may be configured to receive update data for updating the control programs P3 of the ECUs 11a and 11b from the server 16.
  • the radio transmission interval may be set based not only on the radio bus occupancy rate but also on the state of the vehicle 100 such as the speed of the vehicle 100 or the position of the shift lever of the vehicle 100.
  • the ECU transmission interval related to each of the second communication units 34a and 34b may be set based not only on the ECU bus occupation ratio related to each of the ECU buses 14a and 14b but also on the state of the vehicle 100.
  • the number of ECU buses connected to the relay device 10 is not limited to two, and may be three or more. Further, the number of radio buses 15 connected to the relay apparatus 10 is not limited to one, and may be two or more. Further, the number of ECUs connected to the ECU bus is not limited to two, and may be one or three or more. The number of ECUs connected to each ECU bus may not be the same. A communication device other than the wireless device 13 may be connected to the wireless device bus.
  • the communication protocol via the ECU bus and the radio bus is not limited to the CAN protocol or the CAN-FD protocol, and may be, for example, an Ethernet (registered trademark) protocol.
  • the communication protocol via the ECU bus and the radio bus is different from both the CAN protocol and the CAN-FD protocol, the ECU buses 14a and 14b and the radio bus 15 are not limited to the twisted pair lines.

Abstract

For an ECU bus (14a), a control unit (36) of this relay device (10) calculates the ECU bus occupancy ratio, that is, the ratio per unit time occupied by transmission time during which data is transmitted. Next, on the basis of the calculated ECU bus occupancy ratio, the control unit (36) determines a transmission amount per unit time of partial data, which is part of update data for updating a computer program. A second communication unit (34a) repeatedly transmits the partial data over the ECU bus (14a) in the transmission amount per unit time determined by the control unit (36).

Description

中継装置、通信システム、送信方法及びコンピュータプログラムRelay device, communication system, transmission method, and computer program
　本発明は、複数の通信線に接続され、該複数の通信線中の２つの通信線夫々に接続されている２つの通信装置間の通信を中継する中継装置と、該中継装置を備える通信システムと、コンピュータプログラムを更新するための更新データを送信する送信方法と、該更新データを送信するためのコンピュータプログラムとに関する。 The present invention relates to a relay device that is connected to a plurality of communication lines and relays communication between two communication devices connected to each of the two communication lines in the plurality of communication lines, and a communication system including the relay device. And a transmission method for transmitting update data for updating the computer program, and a computer program for transmitting the update data.
　車両に搭載される通信システムとして、複数の通信線に接続され、複数の通信線中の２つの通信線夫々に接続されている２つの通信装置間の通信を中継する中継装置を備える通信システム（例えば、特許文献１を参照）がある。 As a communication system mounted on a vehicle, a communication system including a relay device that is connected to a plurality of communication lines and relays communication between two communication devices connected to two communication lines in the plurality of communication lines ( For example, see Patent Document 1).
　特許文献１に記載の通信システムでは、通信装置は、ＥＣＵ(Electronic Control Unit：電子制御装置)であり、通信装置にはコンピュータプログラムが記憶されている。通信装置はＣＰＵ(Central Processing Unit)を有し、このＣＰＵは、通信装置に記憶されているコンピュータプログラムを実行することによって、種々の処理を実行する。 In the communication system described in Patent Document 1, the communication device is an ECU (Electronic Control Unit), and a computer program is stored in the communication device. The communication apparatus has a CPU (Central Processing Unit), and this CPU executes various processes by executing computer programs stored in the communication apparatus.
　特許文献１に記載の通信システムでは、中継装置は、コンピュータプログラムを更新するための更新データを、前述した複数の通信線中の１つである送信線を介して通信装置に送信する。中継装置は、更新データを送信する場合、送信線について、通信負荷が高いか否かを判定する。 In the communication system described in Patent Document 1, the relay apparatus transmits update data for updating the computer program to the communication apparatus via the transmission line that is one of the plurality of communication lines described above. When transmitting update data, the relay device determines whether the communication load is high for the transmission line.
　中継装置は、例えば、送信線を介してデータが送信されている送信時間が単位時間当たりに占める占有率が高い場合、送信線の通信負荷が高いと判定する。中継装置は、送信線の通信負荷が高いと判定した場合、送信線に接続されている全ての通信装置に制御指令を送信する。これにより、これらの通信装置は送信線を介して単位時間当たりに送信するデータの送信量を低下させるので、送信線の通信負荷は低下する。中継装置は、送信線の通信負荷を低下させた後、送信線を介して、コンピュータプログラムの更新対象である通信装置に更新データを送信する。 The relay device determines that the communication load of the transmission line is high, for example, when the occupancy ratio of the transmission time during which data is transmitted via the transmission line occupies per unit time is high. When it is determined that the communication load on the transmission line is high, the relay device transmits a control command to all the communication devices connected to the transmission line. Thereby, since these communication apparatuses reduce the transmission amount of the data transmitted per unit time via the transmission line, the communication load of the transmission line decreases. After reducing the communication load of the transmission line, the relay apparatus transmits the update data to the communication apparatus that is the update target of the computer program via the transmission line.
特開２０１４－１０６８７５号公報JP 2014-106875 A
　前述したように、特許文献１に記載の通信システムでは、中継装置が、更新データを、送信線を介して通信装置に送信する場合において、送信線の通信負荷が高いとき、更新データを除く他のデータの単位時間当たりの送信量を低下させる。 As described above, in the communication system described in Patent Document 1, when the relay device transmits update data to the communication device via the transmission line, the update data is excluded when the communication load on the transmission line is high. Reduce the amount of data transmitted per unit time.
　送信線を介して送受信されるデータには、車両の運転に関するデータが含まれていると考えられる。車両の運転に関するデータの送受信が遅れた場合、車両内で行われる一部の制御が遅れる可能性がある。このため、更新データを除く他のデータの単位時間当たりの送信量を低下させることは好ましくない。また、更新データの送信は、通常、更新データの一部分である部分データを繰り返し送信することによって実現される。この場合においては、部分データを除く他のデータの単位時間当たりの送信量を低下させることは好ましくない。 The data transmitted / received via the transmission line is considered to contain data related to vehicle operation. When transmission / reception of data relating to driving of a vehicle is delayed, some control performed in the vehicle may be delayed. For this reason, it is not preferable to reduce the transmission amount per unit time of other data excluding update data. In addition, transmission of update data is usually realized by repeatedly transmitting partial data that is a part of update data. In this case, it is not preferable to reduce the transmission amount per unit time of other data excluding partial data.
　本発明は斯かる事情に鑑みてなされたものであり、その目的とするところは、コンピュータプログラムの更新データの一部分である部分データを除く他のデータの単位時間当たりの送信量を低下させることなく、更新データを送信することができる中継装置、送信方法及びコンピュータプログラムと、該中継装置を備える通信システムとを提供することにある。 The present invention has been made in view of such circumstances, and the object of the present invention is to reduce the transmission amount per unit time of other data excluding partial data which is a part of update data of a computer program. Another object of the present invention is to provide a relay device, a transmission method and a computer program capable of transmitting update data, and a communication system including the relay device.
　本発明に係る中継装置は、複数の通信線に接続され、該複数の通信線中の２つの通信線夫々に接続されている２つの通信装置間の通信を中継する中継装置において、前記複数の通信線中の１つである第１通信線について、データが送信されている送信時間が単位時間当たりに占める占有率を算出する算出部と、該算出部が算出した占有率に基づいて、コンピュータプログラムを更新するための更新データの一部分である部分データの単位時間当たりの送信量を決定する決定部と、該決定部が決定した単位時間当たりの送信量で、前記部分データを、前記第１通信線を介して繰り返し送信する送信部とを備えることを特徴とする。 A relay device according to the present invention is a relay device that is connected to a plurality of communication lines and relays communication between two communication devices connected to two communication lines of the plurality of communication lines. A calculation unit that calculates an occupancy ratio of a transmission time during which data is transmitted per unit time for a first communication line that is one of the communication lines, and a computer based on the occupancy ratio calculated by the calculation unit A determination unit that determines a transmission amount per unit time of partial data that is a part of update data for updating a program, and the partial data with the transmission amount per unit time determined by the determination unit. And a transmission unit that repeatedly transmits via a communication line.
　本発明に係る中継装置は、第２通信線について、データが送信されている送信時間が単位時間当たりに占める占有率を算出する第２の算出部と、該第２の算出部が算出した占有率に基づいて、前記部分データの単位時間当たりの送信量を決定する第２の決定部と、該第２の決定部が決定した単位時間当たりの送信量を示す送信量データを、前記第２通信線を介して送信する第２の送信部と、前記第２通信線を介して前記部分データを受信する受信部とを備えることを特徴とする。 The relay apparatus according to the present invention includes a second calculation unit that calculates an occupancy ratio of a transmission time during which data is transmitted per unit time for the second communication line, and an occupancy calculated by the second calculation unit. A second determination unit that determines a transmission amount per unit time of the partial data based on the rate; and transmission amount data indicating the transmission amount per unit time determined by the second determination unit, A second transmission unit that transmits via a communication line and a reception unit that receives the partial data via the second communication line.
　本発明に係る中継装置は、前記決定部は、前記部分データの送信間隔を決定することによって、前記部分データの単位時間当たりの送信量を決定し、前記送信部は、該決定部が決定した送信間隔で、前記部分データを、前記第１通信線を介して繰り返し送信することを特徴とする。 In the relay device according to the present invention, the determination unit determines a transmission amount per unit time of the partial data by determining a transmission interval of the partial data, and the transmission unit is determined by the determination unit. The partial data is repeatedly transmitted via the first communication line at a transmission interval.
　本発明に係る中継装置は、前記算出部の算出及び前記決定部の決定は、該送信部が前記部分データを繰り返し送信している間に行われることを特徴とする。 The relay device according to the present invention is characterized in that the calculation of the calculation unit and the determination of the determination unit are performed while the transmission unit repeatedly transmits the partial data.
　本発明に係る中継装置は、前記送信部は、前記算出部が算出した占有率が所定率以上である間、前記部分データの送信を停止していることを特徴とする。 The relay device according to the present invention is characterized in that the transmission unit stops transmission of the partial data while the occupation rate calculated by the calculation unit is equal to or greater than a predetermined rate.
　本発明に係る通信システムは、前述した中継装置と、前記２つの通信装置とを備えることを特徴とする。 A communication system according to the present invention includes the relay device described above and the two communication devices.
　本発明に係る送信方法は、通信線について、データが送信されている送信時間が単位時間当たりに占める占有率を算出し、算出した占有率に基づいて、コンピュータプログラムを更新するための更新データの一部分である部分データの単位時間当たりの送信量を決定し、決定した単位時間当たりの送信量で、前記部分データを、前記通信線を介して繰り返し送信することを特徴とする。 The transmission method according to the present invention calculates an occupancy ratio of transmission time during which data is transmitted per unit time for a communication line, and updates data for updating a computer program based on the calculated occupancy ratio A transmission amount per unit time of partial data which is a part is determined, and the partial data is repeatedly transmitted via the communication line with the determined transmission amount per unit time.
　本発明に係るコンピュータプログラムは、通信線について、データが送信されている送信時間が単位時間当たりに占める占有率を算出し、算出した占有率に基づいて、コンピュータプログラムを更新するための更新データの一部分である部分データの単位時間当たりの送信量を決定し、決定した単位時間当たりの送信量で、前記部分データが、前記通信線を介して繰り返し送信されるようにデータの送信を指示する処理をコンピュータに実行させることを特徴とする。 A computer program according to the present invention calculates an occupancy ratio of a transmission time during which data is transmitted per unit time for a communication line, and updates data for updating the computer program based on the calculated occupancy ratio Processing for determining a transmission amount per unit time of partial data as a part and instructing data transmission so that the partial data is repeatedly transmitted via the communication line with the determined transmission amount per unit time Is executed by a computer.
　本発明に係る中継装置、送信方法及びコンピュータプログラムにあっては、コンピュータプログラムの更新データの一部分である部分データを、通信線（第１通信線）を介して繰り返し送信する場合、この通信線について、データが送信されている送信時間が単位時間当たりに占める占有率を算出し、算出した占有率に基づいて、部分データの単位時間当たりの送信量を決定する。その後、決定した単位時間当たりの送信量で部分データが送信される。 In the relay apparatus, the transmission method, and the computer program according to the present invention, when the partial data that is a part of the update data of the computer program is repeatedly transmitted via the communication line (first communication line), the communication line The occupancy rate that the transmission time during which data is transmitted occupies per unit time is calculated, and the transmission amount per unit time of the partial data is determined based on the calculated occupancy rate. Thereafter, the partial data is transmitted with the determined transmission amount per unit time.
　以上のように、通信線に係る占有率に基づいて、部分データの単位時間当たりの送信量を変更し、部分データを除く他のデータの単位時間当たりの送信量を変更することはない。このため、部分データを除く他のデータの単位時間当たりの送信量を低下させることなく、更新データが送信される。 As described above, the transmission amount per unit time of partial data is changed based on the occupation rate related to the communication line, and the transmission amount per unit time of other data excluding the partial data is not changed. For this reason, the update data is transmitted without reducing the transmission amount per unit time of other data excluding the partial data.
　本発明に係る中継装置にあっては、第２通信線を介して更新データを受信する場合、第２通信線について、データが送信されている送信時間が単位時間当たりに占める占有率を算出し、算出した占有率に基づいて、部分データの単位時間当たりの送信量を決定する。その後、決定した単位時間当たりの送信量を示す速度データを、第２通信線を介して送信し、部分データを、第２通信線を介して受信する。 In the relay apparatus according to the present invention, when the update data is received via the second communication line, the occupancy ratio of the transmission time during which data is transmitted per unit time is calculated for the second communication line. The transmission amount per unit time of the partial data is determined based on the calculated occupation rate. Thereafter, speed data indicating the determined transmission amount per unit time is transmitted via the second communication line, and partial data is received via the second communication line.
　以上のように、第２通信線に係る占有率に基づいて、部分データの単位時間当たりの送信量を変更し、部分データを除く他のデータの単位時間当たりの送信量を変更することはない。このため、部分データを除く他のデータの単位時間当たりの送信量を低下させることなく、部分データを、第２通信線を介して受信する。 As described above, the transmission amount per unit time of partial data is changed based on the occupation rate related to the second communication line, and the transmission amount per unit time of other data excluding partial data is not changed. . Therefore, the partial data is received via the second communication line without reducing the transmission amount per unit time of other data excluding the partial data.
　本発明に係る中継装置にあっては、繰り返し送信される部分データの送信間隔を決定することによって、部分データの単位時間当たりの送信量の決定を実現する。 In the relay device according to the present invention, the transmission amount of partial data per unit time is determined by determining the transmission interval of repeatedly transmitted partial data.
　本発明に係る中継装置にあっては、部分データを繰り返し送信している間も、占有率の算出と、送信間隔の決定とを行う。これにより、部分データが繰り返し送信されている間も部分データの単位時間当たりの送信量が変更される。部分データを繰り返し送信している間に、通信線に係る占有率が変化した場合も、部分データの単位時間当たりの送信量は、変化した占有率に応じて変更される。 In the relay device according to the present invention, the occupation rate is calculated and the transmission interval is determined even while the partial data is repeatedly transmitted. Thereby, the transmission amount per unit time of the partial data is changed even while the partial data is repeatedly transmitted. Even when the occupation rate related to the communication line changes while the partial data is repeatedly transmitted, the transmission amount of the partial data per unit time is changed according to the changed occupation rate.
　本発明に係る中継装置にあっては、第１通信線に係る占有率が所定率以上である間、部分データの送信を停止しているので、部分データを除く他のデータの送信に悪影響を与える確率は低い。 In the relay device according to the present invention, since the transmission of partial data is stopped while the occupation rate of the first communication line is equal to or higher than the predetermined rate, the transmission of other data excluding the partial data is adversely affected. The probability of giving is low.
　本発明に係る通信システムにあっては、中継装置は、複数の通信線中の２つの通信線夫々に接続されている２つの通信装置間の通信を中継する。中継装置は、複数の通信線中の１つである第１通信線を介して更新データを送信する。 In the communication system according to the present invention, the relay device relays communication between two communication devices connected to each of the two communication lines in the plurality of communication lines. The relay device transmits update data via a first communication line that is one of a plurality of communication lines.
　本発明によれば、コンピュータプログラムの更新データの一部分である部分データを除く他のデータの単位時間当たりの送信量を低下させることなく、更新データを送信することができる。 According to the present invention, the update data can be transmitted without reducing the transmission amount per unit time of other data excluding the partial data which is a part of the update data of the computer program.
本実施の形態における通信システムの要部構成を示すブロック図である。It is a block diagram which shows the principal part structure of the communication system in this Embodiment. データフレームの説明図である。It is explanatory drawing of a data frame. 無線器の要部構成を示すブロック図である。It is a block diagram which shows the principal part structure of a radio | wireless device. 無線器の更新データ送信処理の手順を示すフローチャートである。It is a flowchart which shows the procedure of the update data transmission process of a radio | wireless machine. 無線器から中継装置への更新データの送信の説明図である。It is explanatory drawing of transmission of the update data from a radio | wireless machine to a relay apparatus. 中継装置の要部構成を示すブロック図である。It is a block diagram which shows the principal part structure of a relay apparatus. 無線器バス占有率の算出処理の手順を示すフローチャートである。It is a flowchart which shows the procedure of the calculation process of a radio | wireless machine bus occupation rate. データ長とフレーム長との関係を示す図表である。It is a graph which shows the relationship between data length and frame length. 応答処理の手順を示すフローチャートである。It is a flowchart which shows the procedure of a response process. 無線器バス占有率と送信間隔との関係を示す図表である。It is a graph which shows the relationship between a radio apparatus bus occupation rate and a transmission interval. 中継装置の更新データ送信処理の手順を示すフローチャートである。It is a flowchart which shows the procedure of the update data transmission process of a relay apparatus. ＥＣＵバス占有率と送信間隔との関係を示す図表である。It is a graph which shows the relationship between ECU bus occupation rate and a transmission interval. 中継装置からＥＣＵへの更新データの送信の説明図である。It is explanatory drawing of transmission of the update data from a relay apparatus to ECU. ＥＣＵの要部構成を示すブロック図である。It is a block diagram which shows the principal part structure of ECU.
　以下、本発明をその実施の形態を示す図面に基づいて詳述する。
　図１は、本実施の形態における通信システム１の要部構成を示すブロック図である。通信システム１は、中継装置１０、４つのＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ、無線器１３、２つのＥＣＵバス１４ａ，１４ｂ、無線器バス１５及びサーバ１６を備える。中継装置１０、ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ、無線器１３、ＥＣＵバス１４ａ，１４ｂ及び無線器バス１５は車両１００に搭載されている。 Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
FIG. 1 is a block diagram showing a main configuration of a communication system 1 according to the present embodiment. The communication system 1 includes a relay device 10, four ECUs 11 a, 11 b, 12 a and 12 b, a wireless device 13, two ECU buses 14 a and 14 b, a wireless device bus 15 and a server 16. Relay device 10, ECUs 11 a, 11 b, 12 a, 12 b, wireless device 13, ECU buses 14 a, 14 b and wireless device bus 15 are mounted on vehicle 100.
　中継装置１０には、２つのＥＣＵバス１４ａ，１４ｂ及び無線器バス１５が各別に接続されている。ＥＣＵバス１４ａには、ＥＣＵ１１ａ，１２ａが更に接続されている。ＥＣＵバス１４ｂには、ＥＣＵ１１ｂ，１２ｂが更に接続されている。無線器バス１５には、無線器１３が更に接続されている。サーバ１６は、車両１００の外側に設置されており、外部のネットワークＮ１に接続されている。 Two ECU buses 14a and 14b and a radio device bus 15 are connected to the relay device 10 separately. ECUs 11a and 12a are further connected to the ECU bus 14a. ECUs 11b and 12b are further connected to the ECU bus 14b. A wireless device 13 is further connected to the wireless device bus 15. The server 16 is installed outside the vehicle 100 and is connected to an external network N1.
　ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ夫々には、図示しない電気機器が接続されている。ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ夫々は、自装置に接続されている電気機器に制御データを出力することによって、この電気機器の動作を制御する。 Electrical devices (not shown) are connected to each of the ECUs 11a, 11b, 12a, and 12b. Each of the ECUs 11a, 11b, 12a, and 12b controls the operation of the electric device by outputting control data to the electric device connected to the own device.
　ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ夫々は、通信装置として機能し、相互に有線で通信する。中継装置１０は、ＥＣＵバス１４ａに接続されているＥＣＵ、即ち、ＥＣＵ１１ａ，１２ａ中の１つと、ＥＣＵバス１４ｂに接続されているＥＣＵ、即ち、ＥＣＵ１１ｂ，１２ｂ中の１つとの間の通信を中継する。 Each of the ECUs 11a, 11b, 12a, and 12b functions as a communication device, and communicates with each other by wire. The relay device 10 relays communication between the ECU connected to the ECU bus 14a, that is, one of the ECUs 11a and 12a, and the ECU connected to the ECU bus 14b, that is, one of the ECUs 11b and 12b. To do.
　例えば、ＥＣＵ１２ａは、車両１００のドアのロック又はアンロックの指示を使用者から受け付け、受け付けた指示を示す指示データを、中継装置１０に送信する。中継装置１０は、受信した指示データを、車両１００のドアのロック及びアンロックを行うドアモータに接続されているＥＣＵ１１ｂに送信する。また、例えば、ＥＣＵ１１ａは、車両１００の加速度を検出する加速度センサを有し、加速度センサが検出した加速度を示す加速度データを、中継装置１０に送信する。中継装置１０は、受信した加速度データを、車両１００のエアバッグの動作を制御するＥＣＵ１２ｂに送信する。 For example, the ECU 12a receives an instruction to lock or unlock the door of the vehicle 100 from the user, and transmits instruction data indicating the received instruction to the relay device 10. The relay device 10 transmits the received instruction data to the ECU 11b connected to the door motor that locks and unlocks the door of the vehicle 100. For example, the ECU 11 a includes an acceleration sensor that detects the acceleration of the vehicle 100, and transmits acceleration data indicating the acceleration detected by the acceleration sensor to the relay device 10. The relay device 10 transmits the received acceleration data to the ECU 12b that controls the operation of the airbag of the vehicle 100.
　ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ夫々は、無線器１３と有線で通信する。中継装置１０は、ＥＣＵバス１４ａに接続されているＥＣＵ、即ち、ＥＣＵ１１ａ，１２ａ中の１つと、無線器バス１５に接続されている無線器１３との間の通信を中継する。また、中継装置１０は、ＥＣＵバス１４ｂに接続されているＥＣＵ、即ち、ＥＣＵ１１ｂ，１２ｂ中の１つと、無線器バス１５に接続されている無線器１３との間の通信を中継する。無線器１３は、ネットワークＮ１を介してサーバ１６と無線で通信する。 Each of the ECUs 11a, 11b, 12a, and 12b communicates with the wireless device 13 by wire. The relay device 10 relays communication between the ECU connected to the ECU bus 14 a, that is, one of the ECUs 11 a and 12 a, and the wireless device 13 connected to the wireless device bus 15. Further, the relay device 10 relays communication between the ECU connected to the ECU bus 14 b, that is, one of the ECUs 11 b and 12 b, and the wireless device 13 connected to the wireless device bus 15. The wireless device 13 communicates wirelessly with the server 16 via the network N1.
　例えば、ＥＣＵ１１ａは、車両の走行に関する速度又は加速度等の値を検出するセンサを有し、センサが検出した検出値を示す検出データを中継装置１０に送信する。中継装置１０は、受信した検出データを無線器１３に送信し、無線器１３は、受信した検出データをサーバ１６に送信する。また、例えば、ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ夫々は、自装置、又は、自装置に接続されている電気機器の故障に関する診断結果を示す診断データを中継装置１０に送信する。中継装置１０は、受信した診断データを無線器１３に送信し、無線器１３は、受信した診断データをサーバ１６に送信する。更に、例えば、無線器１３は、サーバ１６から車両１００周辺の交通状況を示す交通データを受信し、受信した交通データを中継装置１０に送信する。中継装置１０は、受信した交通データを、ＥＣＵ１１ａ，１２ａ又はＥＣＵ１１ｂ，１２ｂに送信する。 For example, the ECU 11a includes a sensor that detects a value such as a speed or acceleration related to traveling of the vehicle, and transmits detection data indicating the detection value detected by the sensor to the relay device 10. The relay device 10 transmits the received detection data to the wireless device 13, and the wireless device 13 transmits the received detection data to the server 16. Further, for example, each of the ECUs 11a, 11b, 12a, and 12b transmits diagnostic data indicating a diagnostic result regarding a failure of the own device or an electric device connected to the own device to the relay device 10. The relay device 10 transmits the received diagnostic data to the wireless device 13, and the wireless device 13 transmits the received diagnostic data to the server 16. Further, for example, the wireless device 13 receives traffic data indicating traffic conditions around the vehicle 100 from the server 16 and transmits the received traffic data to the relay device 10. The relay device 10 transmits the received traffic data to the ECUs 11a and 12a or the ECUs 11b and 12b.
　以上のように、ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ及び無線器１３は相互に通信するため、ＥＣＵバス１４ａ，１４ｂ及び無線器バス１５夫々を介して、種々のデータが送信されている。
　ＥＣＵバス１４ａ，１４ｂ夫々は第１通信線として機能し、無線器バス１５は第２通信線として機能する。 As described above, since the ECUs 11a, 11b, 12a, 12b and the wireless device 13 communicate with each other, various data are transmitted through the ECU buses 14a, 14b and the wireless device bus 15, respectively.
Each of the ECU buses 14a and 14b functions as a first communication line, and the wireless device bus 15 functions as a second communication line.
　ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ夫々には、制御プログラムが記憶されている（図１４を参照）。ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ夫々において、制御プログラムが実行されることによって、電気機器を制御するための処理が実行される。 A control program is stored in each of the ECUs 11a, 11b, 12a, and 12b (see FIG. 14). In each of the ECUs 11a, 11b, 12a, and 12b, a process for controlling the electrical device is executed by executing the control program.
　無線器１３は、ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ中の１つに記憶されている制御プログラムを更新するための更新データをサーバ１６から受信する。無線器１３は、サーバ１６から受信した更新データの一部分である部分データを、無線器バス１５を介して中継装置１０に繰り返し送信する。これにより、中継装置１０は更新データを受信する。中継装置１０は、無線器１３から受信した更新データの一部分である部分データを、ＥＣＵバス１４ａ，１４ｂ中の１つを介して繰り返し送信する。これにより、ＥＣＵ１１ａ，１２ａ又はＥＣＵ１１ｂ，１２ｂは更新データを受信する。ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ夫々は、中継装置１０から受信した更新データに基づいて、自装置に記憶されている制御プログラムを更新する。 The wireless device 13 receives update data for updating a control program stored in one of the ECUs 11a, 11b, 12a, and 12b from the server 16. The wireless device 13 repeatedly transmits partial data, which is a part of the update data received from the server 16, to the relay apparatus 10 via the wireless device bus 15. Thereby, the relay apparatus 10 receives the update data. The relay device 10 repeatedly transmits partial data that is a part of the update data received from the wireless device 13 via one of the ECU buses 14a and 14b. Thereby, ECU11a, 12a or ECU11b, 12b receives update data. Each of the ECUs 11a, 11b, 12a, and 12b updates the control program stored in its own device based on the update data received from the relay device 10.
　ＥＣＵバス１４ａ，１４ｂ及び無線器バス１５夫々を介した通信は、ＣＡＮ(Controller Area Network)プロトコル、又は、ＣＡＮ－ＦＤ(Controller Area Network with Flexible Data Rate)プロトコルに従って行われる。これらのプロトコルでは、データを含むデータフレームを送信することによって、データの送信を実現する。ＥＣＵバス１４ａ，１４ｂ及び無線器バス１５夫々はツイストペア線によって構成されている。 Communication via the ECU buses 14a and 14b and the wireless device bus 15 is performed according to a CAN (Controller Area Network) protocol or a CAN-FD (Controller Area Network with Flexible Data Rate) protocol. In these protocols, data transmission is realized by transmitting a data frame including data. Each of the ECU buses 14a and 14b and the radio device bus 15 is constituted by a twisted pair wire.
　図２はデータフレームの説明図である。データフレームは、ＳＯＦ(Start Of Frame)、アービトレーションフィールド、コントロールフィールド、データフィールド、ＣＲＣ(Cyclic Redundancy Check)フィールド、ＡＣＫ(Acknowledge)及びＥＯＦ(End Of Frame)によって構成される。 FIG. 2 is an explanatory diagram of a data frame. The data frame includes SOF (Start (Of Frame), arbitration field, control field, data field, CRC (Cyclic Redundancy Check) field, ACK (Acknowledge), and EOF (End Of Frame).
　ＳＯＦにはメッセージの開始を示す情報が含まれている。アービトレーションフィールドには、識別を行うための識別情報と、ＲＴＲ(Remote Transmission Request)ビットとが含まれる。 The SOF includes information indicating the start of the message. The arbitration field includes identification information for identification and an RTR (Remote Transmission Request) bit.
　コントロールフィールドには、データフィールドに含まれているデータの長さ（以下、データ長という）を示す情報が含まれている。データ長の単位はバイトである。データフィールドには、通知されるべき内容を示すデータが含まれている。前述した指示データ、加速度データ、検出データ、診断データ、交通データ及び部分データ夫々は、データフィールドに含まれるデータである。データフィールドに含まれるデータのデータ長について上限値が設けられている。データ長の上限値は、例えば８バイトである。従って、部分データのデータ長について上限値が設けられており、この上限値は、データフィールドに含まれるデータの上限値である。 The control field includes information indicating the length of data included in the data field (hereinafter referred to as data length). The unit of data length is byte. The data field includes data indicating the contents to be notified. Each of the instruction data, acceleration data, detection data, diagnosis data, traffic data, and partial data described above is data included in the data field. An upper limit is set for the data length of the data included in the data field. The upper limit value of the data length is, for example, 8 bytes. Therefore, an upper limit is provided for the data length of the partial data, and this upper limit is the upper limit of the data included in the data field.
　ＣＲＣフィールドには、コード及びＣＲＣ境界を示す情報が含まれている。ＡＣＫはメッセージが正しく受信されたか否かの確認に用いられる。ＥＯＦにはメッセージの終了を示す情報が含まれている。 The CRC field includes information indicating a code and a CRC boundary. The ACK is used to confirm whether the message has been correctly received. The EOF includes information indicating the end of the message.
　ＥＣＵバス１４ａに接続されている１つの装置がＥＣＵバス１４ａを介して送信したデータは、ＥＣＵバス１４ａに接続されている他の装置の全てによって受信される。同様に、ＥＣＵバス１４ｂに接続されている１つの装置がＥＣＵバス１４ｂを介して送信したデータは、ＥＣＵバス１４ｂに接続されている他の装置の全てによって受信される。また、無線器バス１５に接続されている１つの装置が無線器バス１５を介して送信したデータは、無線器バス１５に接続されている他の装置の全てによって受信される。 Data transmitted from one device connected to the ECU bus 14a via the ECU bus 14a is received by all of the other devices connected to the ECU bus 14a. Similarly, data transmitted from one device connected to the ECU bus 14b via the ECU bus 14b is received by all the other devices connected to the ECU bus 14b. Data transmitted from one device connected to the wireless device bus 15 via the wireless device bus 15 is received by all of the other devices connected to the wireless device bus 15.
　前述したように、データフレームには識別情報が含まれている。ＥＣＵバス１４ａ，１４ｂ及び無線器バス１５夫々において、複数のデータが同時に送信された場合、これらのデータに係る複数のデータフレーム夫々のアービトレーションフィールドに含まれる識別情報データに基づいて、アービトレーション（調停）が行われる。アービトレーションでは、同時に送信された複数のデータフレーム中の１つの送信元のみが送信を継続し、他のデータフレームの送信元は送信を停止する。 As described above, the identification information is included in the data frame. When a plurality of data is transmitted simultaneously in each of the ECU buses 14a and 14b and the radio bus 15, arbitration (arbitration) is performed based on identification information data included in the arbitration field of each of a plurality of data frames related to these data. Is done. In arbitration, only one transmission source among a plurality of data frames transmitted at the same time continues transmission, and the transmission sources of other data frames stop transmission.
　また、中継装置１０、ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ及び無線器１３夫々は、有線でデータを受信した場合、このデータに係るデータフレームに含まれている識別情報に基づいて、受信したデータを破棄すべきか否かを判定する。中継装置１０、ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ及び無線器１３夫々は、データを破棄すべきと判定した場合、受信したデータを破棄し、データを破棄すべきではないと判定した場合、受信したデータに係る処理を行う。 Further, when each of the relay device 10, the ECUs 11a, 11b, 12a, 12b and the wireless device 13 receives data by wire, the received data is discarded based on the identification information included in the data frame related to the data. Determine whether or not to do so. When the relay device 10, the ECUs 11a, 11b, 12a, 12b and the wireless device 13 each determine that the data should be discarded, the received data is discarded when it is determined that the received data should be discarded and the data should not be discarded. The process which concerns on is performed.
　ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ夫々は、部分データを受信した場合、受信した部分データを破棄すべきか否かを判定する。そして、ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ夫々は、受信した部分データを破棄すべきではないと判定した場合、受信した部分データを記憶する。ＥＣＵ１１ａ，１１ｂ，１２ａ，１２ｂ夫々は、全ての部分データ、即ち、更新データを記憶した場合、この更新データに基づいて、制御プログラムを更新する。 ECU11a, 11b, 12a, 12b each determines whether the received partial data should be discarded, when partial data is received. When each of the ECUs 11a, 11b, 12a, and 12b determines that the received partial data should not be discarded, the ECU 11a, 11b, 12a, and 12b stores the received partial data. When each of the ECUs 11a, 11b, 12a, and 12b stores all partial data, that is, update data, the ECU 11a, 11b, 12a, and 12b updates the control program based on the update data.
　図３は、無線器１３の要部構成を示すブロック図である。無線器１３は、無線通信部２０、有線通信部２１、タイマ２２、記憶部２３及び制御部２４を有する。これらはバス２５に各別に接続されている。有線通信部２１は、更に、無線器バス１５に接続されている。 FIG. 3 is a block diagram showing a main configuration of the wireless device 13. The wireless device 13 includes a wireless communication unit 20, a wired communication unit 21, a timer 22, a storage unit 23, and a control unit 24. These are connected to the bus 25 separately. The wired communication unit 21 is further connected to the wireless device bus 15.
　無線通信部２０は、サーバ１６からネットワークＮ１を介して、データを無線で受信する。更新データは、無線通信部２０が受信するデータの１つである。無線通信部２０は、制御部２４の指示に従って、データを無線でサーバ１６に送信する。 The wireless communication unit 20 wirelessly receives data from the server 16 via the network N1. The update data is one of data received by the wireless communication unit 20. The wireless communication unit 20 transmits data to the server 16 wirelessly in accordance with an instruction from the control unit 24.
　有線通信部２１は、中継装置１０から無線器バス１５を介して、データを受信する。有線通信部２１は、制御部２４の指示に従って、データを中継装置１０に送信する。更新データの一部分である部分データは、有線通信部２１が送信するデータの１つである。
　タイマ２２は、制御部２４の指示に従って、計時の開始及び終了を行う。タイマ２２が計時している計時時間は制御部２４によって読み出される。 The wired communication unit 21 receives data from the relay device 10 via the wireless device bus 15. The wired communication unit 21 transmits data to the relay device 10 in accordance with an instruction from the control unit 24. The partial data that is a part of the update data is one of the data transmitted by the wired communication unit 21.
The timer 22 starts and ends timing in accordance with instructions from the control unit 24. The time measured by the timer 22 is read by the control unit 24.
　記憶部２３は例えば不揮発性メモリである。記憶部２３には、制御プログラムＰ１が記憶されている。
　制御部２４は図示しないＣＰＵを有する。制御部２４のＣＰＵは、制御プログラムＰ１を実行することによって、データ送信処理、無線送信処理及び更新データ送信処理等を実行する。制御プログラムＰ１は、制御部２４のＣＰＵにデータ送信処理、無線送信処理及び更新データ処理を実行させるためのコンピュータプログラムである。 The storage unit 23 is, for example, a nonvolatile memory. The storage unit 23 stores a control program P1.
The control unit 24 has a CPU (not shown). The CPU of the control unit 24 executes a data transmission process, a wireless transmission process, an update data transmission process, and the like by executing the control program P1. The control program P1 is a computer program for causing the CPU of the control unit 24 to execute data transmission processing, wireless transmission processing, and update data processing.
　なお、制御プログラムＰ１は、コンピュータが読み取り可能に、記憶媒体Ａ１に記憶されていてもよい。この場合、図示しない読み出し装置によって記憶媒体Ａ１から読み出された制御プログラムＰ１が記憶部２３に記憶される。記憶媒体Ａ１は、光ディスク、フレキシブルディスク、磁気ディスク、磁気光ディスク又は半導体メモリ等である。光ディスクは、ＣＤ（Compact Disc）－ＲＯＭ(Read Only Memory)、ＤＶＤ（Digital Versatile Disc）－ＲＯＭ、又は、ＢＤ（Blu-ray(登録商標) Disc）等である。磁気ディスクは、例えばハードディスクである。また、図示しない通信網に接続されている図示しない外部装置から制御プログラムＰ１をダウンロードし、ダウンロードした制御プログラムＰ１を記憶部２３に記憶してもよい。 The control program P1 may be stored in the storage medium A1 so that the computer can read it. In this case, the control program P1 read from the storage medium A1 by a reading device (not shown) is stored in the storage unit 23. The storage medium A1 is an optical disk, a flexible disk, a magnetic disk, a magnetic optical disk, a semiconductor memory, or the like. The optical disc is a CD (Compact Disc) -ROM (Read Only Memory), a DVD (Digital Versatile Disc) -ROM, or a BD (Blu-ray (registered trademark) Disc). The magnetic disk is, for example, a hard disk. Alternatively, the control program P1 may be downloaded from an external device (not shown) connected to a communication network (not shown), and the downloaded control program P1 may be stored in the storage unit 23.
　制御部２４は、データ送信処理、無線送信処理及び更新データ送信処理を、時分割方式で実行する。従って、制御部２４は、１つの処理で待機している間、他の処理を実行する。例えば、制御部２４は、更新データ送信処理で待機している間、データ送信処理を実行する。 The control unit 24 performs data transmission processing, wireless transmission processing, and update data transmission processing in a time division manner. Therefore, the control unit 24 executes another process while waiting in one process. For example, the control unit 24 executes the data transmission process while waiting in the update data transmission process.
　データ送信処理は、更新データの一部分である部分データを除く他のデータを、無線器バス１５を介して送信するための処理である。制御部２４は、部分データを除く他のデータを無線通信部２０が受信した場合にデータ送信処理を実行する。データ送信処理では、制御部２４は、有線通信部２１に指示して、無線通信部２０が受信したデータを中継装置１０に送信させる。その後、制御部２４はデータ送信処理を終了する。 The data transmission process is a process for transmitting other data, excluding partial data, which is a part of the update data, via the wireless device bus 15. The control unit 24 executes data transmission processing when the wireless communication unit 20 receives other data excluding partial data. In the data transmission process, the control unit 24 instructs the wired communication unit 21 to transmit the data received by the wireless communication unit 20 to the relay device 10. Thereafter, the control unit 24 ends the data transmission process.
　無線送信処理は、データを無線でサーバ１６に送信するための処理である。制御部２４は、有線通信部２１がデータを受信した場合、無線送信処理を実行する。無線送信処理では、制御部２４は、有線通信部２１が受信したデータのデータフレームに含まれている識別情報に基づいて、有線通信部２１が受信したデータを破棄すべきか否かを判定する。制御部２４は、有線通信部２１が受信したデータを破棄すべきと判定した場合、このデータを破棄し、無線送信処理を終了する。制御部２４は、有線通信部２１が受信したデータを破棄すべきではないと判定した場合、無線通信部２０に指示して、このデータをサーバ１６に無線で送信させ、無線送信処理を終了する。
　更新データ送信処理は、更新データを、無線器バス１５を介して送信するための処理である。 The wireless transmission process is a process for transmitting data to the server 16 wirelessly. When the wired communication unit 21 receives data, the control unit 24 performs wireless transmission processing. In the wireless transmission process, the control unit 24 determines whether or not the data received by the wired communication unit 21 should be discarded based on the identification information included in the data frame of the data received by the wired communication unit 21. When it is determined that the data received by the wired communication unit 21 should be discarded, the control unit 24 discards this data and ends the wireless transmission process. When the control unit 24 determines that the data received by the wired communication unit 21 should not be discarded, the control unit 24 instructs the wireless communication unit 20 to transmit the data to the server 16 wirelessly, and ends the wireless transmission process. .
The update data transmission process is a process for transmitting update data via the radio bus 15.
　図４は、無線器１３の更新データ送信処理の手順を示すフローチャートである。制御部２４は、無線通信部２０が更新データを受信した場合に更新データ送信処理を実行する。記憶部２３には、有線通信部２１が部分データを送信する時間間隔である無線器送信間隔と、部分データが送信された回数である無線器送信回数と、無線器送信回数に係る第１閾値とが記憶されている。第１閾値は、一定値であり、自然数である。 FIG. 4 is a flowchart showing a procedure of update data transmission processing of the wireless device 13. The control unit 24 executes update data transmission processing when the wireless communication unit 20 receives update data. The storage unit 23 includes a wireless device transmission interval that is a time interval at which the wired communication unit 21 transmits partial data, a wireless device transmission number that is the number of times the partial data is transmitted, and a first threshold value related to the wireless device transmission number. Is stored. The first threshold value is a constant value and is a natural number.
　更新データ送信処理では、制御部２４は、有線通信部２１に、無線器送信間隔の通知を要求する要求データの送信を指示する（ステップＳ１）。これにより、有線通信部２１は要求データを中継装置１０に送信する。中継装置１０は、有線通信部２１から要求データを受信した場合、無線器送信間隔、又は、更新データの送信不可を示す応答データを送信する。 In the update data transmission process, the control unit 24 instructs the wired communication unit 21 to transmit request data for requesting notification of the wireless device transmission interval (step S1). Thereby, the wired communication unit 21 transmits the request data to the relay device 10. When the relay device 10 receives the request data from the wired communication unit 21, the relay device 10 transmits response data indicating that the wireless device transmission interval or update data cannot be transmitted.
　制御部２４は、ステップＳ１を実行した後、有線通信部２１が中継装置１０から応答データを受信したか否かを判定する（ステップＳ２）。制御部２４は、有線通信部２１が応答データを受信していないと判定した場合（Ｓ２：ＮＯ）、ステップＳ２を再び実行し、有線通信部２１が応答データを受信するまで待機する。 After executing step S1, the control unit 24 determines whether the wired communication unit 21 has received response data from the relay device 10 (step S2). When it is determined that the wired communication unit 21 has not received the response data (S2: NO), the control unit 24 executes Step S2 again and waits until the wired communication unit 21 receives the response data.
　制御部２４は、有線通信部２１が応答データを受信したと判定した場合（Ｓ２：ＹＥＳ）、有線通信部２１が受信した応答データが送信不可を示すか否かを判定する（ステップＳ３）。制御部２４は、応答データが送信不可を示すと判定した場合（Ｓ３：ＹＥＳ）、ステップＳ１を実行する。ここで、制御部２４は、応答データが送信不可を示すと判定してから一定時間が経過した後にステップＳ１を実行する。制御部２４は、有線通信部２１が、送信不可を示さない応答データ、即ち、無線器送信間隔を示す応答データを受信するまで要求データを繰り返し送信する。 When it is determined that the wired communication unit 21 has received the response data (S2: YES), the control unit 24 determines whether the response data received by the wired communication unit 21 indicates that transmission is not possible (step S3). When it is determined that the response data indicates that transmission is not possible (S3: YES), the control unit 24 executes Step S1. Here, the control unit 24 executes Step S1 after a predetermined time has elapsed since it was determined that the response data indicates that transmission is not possible. The control unit 24 repeatedly transmits the request data until the wired communication unit 21 receives response data indicating that transmission is not possible, that is, response data indicating the wireless device transmission interval.
　制御部２４は、応答データが送信不可を示していないと判定した場合（Ｓ３：ＮＯ）、記憶部２３に記憶されている無線器送信間隔を、有線通信部２１が受信した応答データが示す無線器送信間隔に変更し（ステップＳ４）、記憶部２３に記憶されている無線器送信回数をゼロに設定する（ステップＳ５）。 When the control unit 24 determines that the response data does not indicate that transmission is not possible (S3: NO), the wireless device transmission interval stored in the storage unit 23 indicates the wireless transmission interval indicated by the response data received by the wired communication unit 21. The transmitter transmission interval is changed (step S4), and the number of radio transmissions stored in the storage unit 23 is set to zero (step S5).
　次に、制御部２４は、タイマ２２に指示して計時を開始させ（ステップＳ６）、有線通信部２１に部分データの送信を指示する（ステップＳ７）。これにより、有線通信部２１は、部分データを、無線器バス１５を介して、中継装置１０に送信する。 Next, the control unit 24 instructs the timer 22 to start timing (step S6), and instructs the wired communication unit 21 to transmit partial data (step S7). As a result, the wired communication unit 21 transmits the partial data to the relay device 10 via the wireless device bus 15.
　次に、制御部２４は、記憶部２３に記憶されている無線器送信回数を１だけインクリメントし（ステップＳ８）、更新データ、即ち、全ての部分データの送信が完了したか否かを判定する（ステップＳ９）。制御部２４は、更新データの送信が完了していないと判定した場合（Ｓ９：ＮＯ）、タイマ２２が計時している計時時間が、記憶部２３に記憶されている無線器送信間隔、即ち、有線通信部２１が受信した応答データが示す無線器送信間隔以上であるか否かを判定する（ステップＳ１０）。 Next, the control unit 24 increments the number of radio transmissions stored in the storage unit 23 by 1 (step S8), and determines whether or not transmission of update data, that is, all partial data has been completed. (Step S9). When the control unit 24 determines that the transmission of the update data has not been completed (S9: NO), the time measured by the timer 22 is the radio transmission interval stored in the storage unit 23, that is, It is determined whether the response data received by the wired communication unit 21 is equal to or longer than the wireless device transmission interval (step S10).
　制御部２４は、計時時間が無線器送信間隔未満であると判定した場合（Ｓ１０：ＮＯ）、ステップＳ１０を再び実行し、計時時間が無線器送信間隔以上となるまで待機する。制御部２４は、計時時間が無線器送信間隔以上であると判定した場合（Ｓ１０：ＹＥＳ）、タイマ２２に指示して計時を終了させ（ステップＳ１１）、記憶部２３に記憶されている無線器送信回数が第１閾値であるか否かを判定する（ステップＳ１２）。 When it is determined that the timed time is less than the wireless device transmission interval (S10: NO), the control unit 24 executes Step S10 again and waits until the timed time becomes equal to or longer than the wireless device transmission interval. When it is determined that the measured time is equal to or greater than the wireless device transmission interval (S10: YES), the control unit 24 instructs the timer 22 to end the time measurement (step S11), and the wireless device stored in the storage unit 23 It is determined whether or not the number of transmissions is the first threshold (step S12).
　制御部２４は、無線器送信回数が第１閾値ではない、即ち、無線器送信回数が第１閾値未満であると判定した場合（Ｓ１２：ＮＯ）、ステップＳ６を実行する。制御部２４は、更新データの送信が完了するか、又は、無線器送信回数が第１閾値に到達するまで、有線通信部２１に指示して、無線器送信間隔で部分データを繰り返し送信させる。
　制御部２４は、無線器送信回数が第１閾値であると判定した場合（Ｓ１２：ＹＥＳ）、ステップＳ１を再び実行する。有線通信部２１は、再び、要求データを中継装置１０に送信し、中継装置１０から無線器送信間隔を示す応答データを受信する。有線通信部２１は、新たに受信した応答データが示す無線器送信間隔で部分データを繰り返し送信する。 When it is determined that the wireless device transmission count is not the first threshold value, that is, the wireless device transmission count is less than the first threshold value (S12: NO), the control unit 24 executes Step S6. The control unit 24 instructs the wired communication unit 21 to repeatedly transmit the partial data at the wireless device transmission interval until the transmission of the update data is completed or the wireless device transmission count reaches the first threshold value.
When it is determined that the wireless device transmission count is the first threshold value (S12: YES), the control unit 24 executes Step S1 again. The wired communication unit 21 again transmits the request data to the relay device 10 and receives response data indicating the wireless device transmission interval from the relay device 10. The wired communication unit 21 repeatedly transmits the partial data at the wireless device transmission interval indicated by the newly received response data.
　制御部２４は、更新データの送信が完了したと判定した場合（Ｓ９：ＹＥＳ）、タイマ２２に指示して計時を終了させ（ステップＳ１３）、有線通信部２１に、更新データの送信が完了したことを示す完了データの送信を指示する（ステップＳ１４）。これにより、有線通信部２１は、完了データを、無線器バス１５を介して中継装置１０に送信し、中継装置１０に更新データの送信完了を通知する。
　制御部２４は、ステップＳ１４を実行した後、更新データ送信処理を終了する。 When it is determined that the transmission of the update data has been completed (S9: YES), the control unit 24 instructs the timer 22 to finish timing (step S13), and the wired communication unit 21 has completed the transmission of the update data. This is instructed to transmit completion data indicating this (step S14). Thereby, the wired communication unit 21 transmits the completion data to the relay device 10 via the wireless device bus 15 and notifies the relay device 10 of the completion of transmission of the update data.
After executing Step S14, the control unit 24 ends the update data transmission process.
　図５は、無線器１３から中継装置１０への更新データの送信の説明図である。ここでは、第１閾値が３である場合における更新データの送信の一例が示されている。図５に示すように、無線器１３の有線通信部２１は、中継装置１０への更新データの送信を開始する場合、要求データを中継装置１０に送信し、無線器送信回数をゼロに設定する。有線通信部２１は、応答データを中継装置１０から受信し、受信した応答データが示す無線器送信間隔で部分データを繰り返し送信する。 FIG. 5 is an explanatory diagram of transmission of update data from the wireless device 13 to the relay device 10. Here, an example of transmission of update data when the first threshold is 3 is shown. As shown in FIG. 5, when starting the transmission of update data to the relay device 10, the wired communication unit 21 of the wireless device 13 transmits request data to the relay device 10 and sets the number of times the wireless device has been transmitted to zero. . The wired communication unit 21 receives the response data from the relay device 10 and repeatedly transmits the partial data at the wireless device transmission interval indicated by the received response data.
　制御部２４は、部分データが送信される都度、無線器送信回数を１だけインクリメントする。有線通信部２１は、無線器送信回数が第１閾値、即ち、３となった場合、再び要求データを送信し、応答データを中継装置１０から受信する。このとき、制御部２４は無線器送信回数をゼロに設定する。有線通信部２１は、中継装置１０から新たに受信した応答データが示す無線器送信間隔で部分データを中継装置１０に繰り返し送信する。 The control unit 24 increments the wireless device transmission count by 1 each time the partial data is transmitted. The wired communication unit 21 transmits the request data again and receives the response data from the relay device 10 when the wireless device transmission count reaches the first threshold, that is, 3. At this time, the control unit 24 sets the number of radio transmissions to zero. The wired communication unit 21 repeatedly transmits partial data to the relay device 10 at the wireless transmission interval indicated by the response data newly received from the relay device 10.
　以上のように、無線器送信回数が第１閾値となる都度、有線通信部２１は、応答データを中継装置１０から新たに受信し、新たに受信した応答データが示す無線器送信間隔で部分データを繰り返し送信する。前述したように、部分データのデータ長について上限値が設けられている。更新データを構成する全ての部分データの中で最後に送信される部分データを除く他の部分データのデータ長は、上限値であり、一定である。
　有線通信部２１は、更新データの送信が完了した場合、完了データを中継装置１０に送信し、更新データの送信完了を中継装置１０に通知する。
　無線器送信間隔については後述する。 As described above, each time the wireless device transmission count becomes the first threshold, the wired communication unit 21 newly receives response data from the relay device 10 and performs partial data transmission at the wireless device transmission interval indicated by the newly received response data. Is sent repeatedly. As described above, an upper limit is set for the data length of the partial data. The data length of the other partial data except the partial data transmitted last among all the partial data constituting the update data is an upper limit value and is constant.
When the transmission of the update data is completed, the wired communication unit 21 transmits the completion data to the relay device 10 and notifies the relay device 10 of the completion of the update data transmission.
The radio transmission interval will be described later.
　図６は、中継装置１０の要部構成を示すブロック図である。中継装置１０は、第１タイマ３０、２つの第２タイマ３１ａ，３１ｂ、２つの送信タイマ３２ａ，３２ｂ、第１通信部３３、２つの第２通信部３４ａ，３４ｂ、記憶部３５及び制御部３６を有する。これらは、バス３７に各別に接続されている。第１通信部３３は、更に無線器バス１５に接続されている。第２通信部３４ａは、更に、ＥＣＵバス１４ａに接続されている。第２通信部３４ｂは、更に、ＥＣＵバス１４ｂに接続されている。 FIG. 6 is a block diagram illustrating a configuration of a main part of the relay device 10. The relay device 10 includes a first timer 30, two second timers 31a and 31b, two transmission timers 32a and 32b, a first communication unit 33, two second communication units 34a and 34b, a storage unit 35, and a control unit 36. Have These are connected to the bus 37 separately. The first communication unit 33 is further connected to the radio bus 15. The second communication unit 34a is further connected to the ECU bus 14a. The second communication unit 34b is further connected to the ECU bus 14b.
　第１タイマ３０、第２タイマ３１ａ，３１ｂ及び送信タイマ３２ａ，３２ｂ夫々は、制御部３６の指示に従って、計時の開始及び終了を行う。第１タイマ３０、第２タイマ３１ａ，３１ｂ及び送信タイマ３２ａ，３２ｂ夫々が計時した計時時間は制御部３６によって読み出される。 The first timer 30, the second timers 31a and 31b, and the transmission timers 32a and 32b each start and end timing according to instructions from the control unit 36. The time measured by each of the first timer 30, the second timers 31a and 31b, and the transmission timers 32a and 32b is read by the control unit 36.
　第１通信部３３は、無線器１３の有線通信部２１から、無線器バス１５を介してデータを受信する。更新データの一部分である部分データは、第１通信部３３が受信するデータの１つである。第１通信部３３は、制御部３６の指示に従って、無線器バス１５を介してデータを無線器１３の有線通信部２１に送信する。第１通信部３３は受信部として機能する。 The first communication unit 33 receives data from the wired communication unit 21 of the wireless device 13 via the wireless device bus 15. The partial data that is a part of the update data is one of the data received by the first communication unit 33. The first communication unit 33 transmits data to the wired communication unit 21 of the wireless device 13 via the wireless device bus 15 in accordance with an instruction from the control unit 36. The first communication unit 33 functions as a receiving unit.
　第２通信部３４ａは、ＥＣＵ１１ａ，１２ａ夫々がＥＣＵバス１４ａを介して送信したデータを受信する。第２通信部３４ａは、制御部３６の指示に従って、ＥＣＵバス１４ａを介してデータをＥＣＵ１１ａ，１２ａに送信する。部分データは、第２通信部３４ａが送信するデータの１つである。
　同様に、第２通信部３４ｂは、ＥＣＵ１１ｂ，１２ｂ夫々がＥＣＵバス１４ｂを介して送信したデータを受信する。第２通信部３４ｂは、制御部３６の指示に従って、ＥＣＵバス１４ｂを介してデータをＥＣＵ１１ｂ，１２ｂに送信する。部分データは、第２通信部３４ｂが送信するデータの１つである。 The second communication unit 34a receives data transmitted from the ECUs 11a and 12a via the ECU bus 14a. The second communication unit 34a transmits data to the ECUs 11a and 12a via the ECU bus 14a in accordance with instructions from the control unit 36. The partial data is one of data transmitted by the second communication unit 34a.
Similarly, the second communication unit 34b receives data transmitted from the ECUs 11b and 12b via the ECU bus 14b. The second communication unit 34b transmits data to the ECUs 11b and 12b via the ECU bus 14b in accordance with an instruction from the control unit 36. The partial data is one of data transmitted by the second communication unit 34b.
　記憶部３５は例えば不揮発性メモリである。記憶部３５には、制御プログラムＰ２が記憶されている。
　制御部３６は図示しないＣＰＵを有する。制御部３６は、記憶部３５に記憶されている制御プログラムＰ２を実行することによって、中継処理、無線器バス占有率の算出処理、ＥＣＵバス１４ａ，１４ｂ夫々に係るＥＣＵバス占有率の算出処理、要求データに対する応答処理、及び、ＥＣＵバス１４ａ，１４ｂ夫々を介して更新データを送信するための更新データ送信処理を実行する。 The storage unit 35 is, for example, a nonvolatile memory. The storage unit 35 stores a control program P2.
The control unit 36 has a CPU (not shown). The control unit 36 executes the control program P2 stored in the storage unit 35, thereby performing relay processing, calculation processing of the radio equipment bus occupancy, calculation processing of the ECU bus occupancy relating to each of the ECU buses 14a and 14b, A response process for the request data and an update data transmission process for transmitting the update data via the ECU buses 14a and 14b are executed.
　ここで、無線器バス占有率は、無線器バス１５について、送信が行われている送信時間が単位時間当たりに占める占有率である。ＥＣＵバス１４ａに係るＥＣＵバス占有率は、ＥＣＵバス１４ａについて、送信が行われている送信時間が単位時間当たりに占める占有率である。同様に、ＥＣＵバス１４ｂに係るＥＣＵバス占有率は、ＥＣＵバス１４ｂについて、送信が行われている送信時間が単位時間当たりに示す占有率である。これらの占有率の単位はパーセント（％）である。 Here, the radio device bus occupancy rate is an occupancy rate of the radio device bus 15 occupying the transmission time during which transmission is performed per unit time. The ECU bus occupation ratio related to the ECU bus 14a is an occupation ratio of the transmission time during which transmission is performed with respect to the ECU bus 14a per unit time. Similarly, the ECU bus occupation ratio relating to the ECU bus 14b is an occupation ratio indicating the transmission time during which transmission is performed for the ECU bus 14b per unit time. These occupancy units are in percent (%).
　制御プログラムＰ２は、制御部３６のＣＰＵに、中継処理、無線器バス占有率の算出処理、ＥＣＵバス１４ａ，１４ｂ夫々に係るＥＣＵバス占有率の算出処理、要求データに対する応答処理、及び、ＥＣＵバス１４ａ，１４ｂ夫々を介して更新データを送信するための更新データ送信処理を実行させるためのコンピュータプログラムである。
　なお、制御プログラムＰ２は、コンピュータが読み取り可能に、記憶媒体Ａ２に記憶されていてもよい。この場合、図示しない読み出し装置によって記憶媒体Ａ２から読み出された制御プログラムＰ２が記憶部３５に記憶される。記憶媒体Ａ２は、光ディスク、フレキシブルディスク、磁気ディスク、磁気光ディスク又は半導体メモリ等である。また、図示しない通信網に接続されている図示しない外部装置から制御プログラムＰ２をダウンロードし、ダウンロードした制御プログラムＰ２を記憶部３５に記憶してもよい。 The control program P2 is connected to the CPU of the control unit 36 by relay processing, calculation processing of the radio bus occupancy, calculation processing of the ECU bus occupancy relating to each of the ECU buses 14a and 14b, response processing to the request data, and ECU bus 14 is a computer program for executing update data transmission processing for transmitting update data via 14a and 14b, respectively.
The control program P2 may be stored in the storage medium A2 so that the computer can read it. In this case, the control program P2 read from the storage medium A2 by a reading device (not shown) is stored in the storage unit 35. The storage medium A2 is an optical disk, a flexible disk, a magnetic disk, a magnetic optical disk, a semiconductor memory, or the like. Alternatively, the control program P2 may be downloaded from an external device (not shown) connected to a communication network (not shown), and the downloaded control program P2 may be stored in the storage unit 35.
　制御部３６は、中継処理、無線器バス占有率の算出処理、ＥＣＵバス１４ａ，１４ｂ夫々に係るＥＣＵバス占有率の算出処理、応答処理及び更新データ送信処理を、時分割方式で実行する。従って、制御部３６は、１つの処理で待機している間、他の処理を実行する。 The control unit 36 performs relay processing, radio device bus occupancy rate calculation processing, ECU bus occupancy rate calculation processing, response processing, and update data transmission processing for each of the ECU buses 14a and 14b in a time-sharing manner. Therefore, the control unit 36 executes another process while waiting in one process.
　中継処理は、ＥＣＵ１１ａ，１２ａ中の１つと、ＥＣＵ１１ｂ，１２ｂ中の１つとの間の通信、ＥＣＵ１１ａ，１２ａ中の１つと無線器１３との間の通信、及び、ＥＣＵ１１ｂ，１２ｂ中の１つと無線器１３との間の通信を中継するための処理である。制御部３６は、第１通信部３３が部分データを除く他のデータを受信した場合、又は、第２通信部３４ａ，３４ｂの一方がデータを受信した場合に中継処理を実行する。 The relay processing includes communication between one of the ECUs 11a and 12a and one of the ECUs 11b and 12b, communication between one of the ECUs 11a and 12a and the wireless device 13, and wireless communication with one of the ECUs 11b and 12b. This is a process for relaying communication with the device 13. The control unit 36 performs relay processing when the first communication unit 33 receives other data excluding partial data, or when one of the second communication units 34a and 34b receives data.
　第１通信部３３が、無線器１３から、部分データを除く他のデータを受信した場合、中継処理では、制御部３６は、第１通信部３３が受信したデータのデータフレームに含まれる識別情報に基づいて、第１通信部３３が受信したデータを破棄すべきか否かを判定する。制御部３６は、第１通信部３３が受信したデータを破棄すべきと判定した場合、このデータを破棄し、中継処理を終了する。制御部３６は、第１通信部３３が受信したデータを破棄すべきではないと判定した場合、このデータのデータフレームに含まれている識別情報に基づいて、第２通信部３４ａ，３４ｂ中の一方又は両方を選択し、選択した通信部に指示して、第１通信部３３が受信したデータを送信させる。 When the first communication unit 33 receives other data excluding partial data from the wireless device 13, in the relay process, the control unit 36 includes identification information included in the data frame of the data received by the first communication unit 33. Based on the above, it is determined whether or not the data received by the first communication unit 33 should be discarded. When it is determined that the data received by the first communication unit 33 should be discarded, the control unit 36 discards this data and ends the relay process. When it is determined that the data received by the first communication unit 33 should not be discarded, the control unit 36 determines whether the data in the second communication units 34a and 34b is based on the identification information included in the data frame of this data. One or both are selected and the selected communication unit is instructed to transmit the data received by the first communication unit 33.
　第２通信部３４ａが、ＥＣＵ１１ａ，１２ａ中の１つから、部分データを除く他のデータを受信した場合、中継処理では、制御部３６は、第２通信部３４ａが受信したデータのデータフレームに含まれる識別情報に基づいて、第２通信部３４ａが受信したデータを破棄すべきか否かを判定する。制御部３６は、第２通信部３４ａが受信したデータを破棄すべきと判定した場合、このデータを破棄し、中継処理を終了する。制御部３６は、第２通信部３４ａが受信したデータを破棄すべきではないと判定した場合、このデータのデータフレームに含まれている識別情報に基づいて、第１通信部３３及び第２通信部３４ｂ中の一方又は両方を選択し、選択した通信部に指示して、第２通信部３４ａが受信したデータを送信させる。 When the second communication unit 34a receives other data excluding partial data from one of the ECUs 11a and 12a, in the relay process, the control unit 36 adds the data frame of the data received by the second communication unit 34a. Based on the included identification information, it is determined whether or not the data received by the second communication unit 34a should be discarded. When it is determined that the data received by the second communication unit 34a should be discarded, the control unit 36 discards the data and ends the relay process. When the control unit 36 determines that the data received by the second communication unit 34a should not be discarded, the first communication unit 33 and the second communication are based on the identification information included in the data frame of the data. One or both of the units 34b are selected, and the selected communication unit is instructed to transmit the data received by the second communication unit 34a.
　同様に、第２通信部３４ｂが、ＥＣＵ１１ｂ，１２ｂ中の１つから、部分データを除く他のデータを受信した場合、中継処理では、制御部３６は、第２通信部３４ｂが受信したデータのデータフレームに含まれる識別情報に基づいて、第２通信部３４ｂが受信したデータを破棄すべきか否かを判定する。制御部３６は、第２通信部３４ｂが受信したデータを破棄すべきと判定した場合、このデータを破棄し、中継処理を終了する。制御部３６は、第２通信部３４ｂが受信したデータを破棄すべきではないと判定した場合、このデータのデータフレームに含まれている識別情報に基づいて、第１通信部３３及び第２通信部３４ａ中の一方又は両方を選択し、選択した通信部に指示して、第２通信部３４ｂが受信したデータを送信させる。 Similarly, when the second communication unit 34b receives other data excluding partial data from one of the ECUs 11b and 12b, in the relay process, the control unit 36 transmits the data received by the second communication unit 34b. Based on the identification information included in the data frame, it is determined whether or not the data received by the second communication unit 34b should be discarded. When it is determined that the data received by the second communication unit 34b should be discarded, the control unit 36 discards this data and ends the relay process. When the control unit 36 determines that the data received by the second communication unit 34b should not be discarded, the control unit 36 performs the first communication unit 33 and the second communication based on the identification information included in the data frame of this data. One or both of the units 34a are selected, and the selected communication unit is instructed to transmit the data received by the second communication unit 34b.
　図７は、無線器バス占有率の算出処理の手順を示すフローチャートである。制御部３６は無線器バス占有率の算出処理を周期的に実行する。記憶部３５には、無線器バス占有率と、無線器バス１５について、データが送信されている送信時間を示す無線器送信時間とが記憶されている。 FIG. 7 is a flowchart showing the procedure of the wireless device bus occupation rate calculation process. The control unit 36 periodically executes the wireless device bus occupancy rate calculation process. The storage unit 35 stores the wireless device bus occupancy rate and the wireless device transmission time indicating the transmission time during which data is transmitted for the wireless device bus 15.
　無線器バス占有率の算出処理では、制御部３６は、記憶部３５に記憶されている無線器送信時間をゼロに設定し（ステップＳ２１）、第１タイマ３０に指示して計時を開始させる（ステップＳ２２）。次に、制御部３６は、第１通信部３３によって、データの送信又は受信が実行されたか否かを判定する（ステップＳ２３）。制御部３６は、データの送信又は受信が実行されたと判定した場合（Ｓ２３：ＹＥＳ）、データの送信又は受信で用いられたデータフレームのコントロールフィールドに含まれている情報からデータ長を読み出し（ステップＳ２４）、読み出したデータ長に対応するデータフレームのフレーム長を記憶部３５から読み出す（ステップＳ２５）。
　なお、ステップＳ２５では、ステップＳ２４で読み出したデータ長を演算式に代入することによってフレーム長を算出してもよい。 In the wireless device bus occupancy rate calculation process, the control unit 36 sets the wireless device transmission time stored in the storage unit 35 to zero (step S21), and instructs the first timer 30 to start measuring time ( Step S22). Next, the control unit 36 determines whether data transmission or reception has been executed by the first communication unit 33 (step S23). When it is determined that data transmission or reception has been executed (S23: YES), the control unit 36 reads the data length from the information included in the control field of the data frame used in the data transmission or reception (step S23). S24) The frame length of the data frame corresponding to the read data length is read from the storage unit 35 (step S25).
In step S25, the frame length may be calculated by substituting the data length read in step S24 into an arithmetic expression.
　図８はデータ長とフレーム長との関係を示す図表である。記憶部３５には、図８に示すようなデータ長とフレーム長との関係が記憶されている。データ長の単位は前述したようにバイトである。フレーム長の単位は秒である。図８の例では、データ長がゼロバイトであるデータフレームのフレーム長はＴ０であり、データ長が１バイトであるデータフレームのフレーム長はＴ１であり、データ長が２バイトであるデータフレームのフレーム長はＴ２である。ステップＳ２５では、制御部３６は、ステップＳ２４で読み出したデータ長に対応するフレーム長を読み出す。当然のことながら、データ長が大きい程、フレーム長は長い。このため、フレーム長Ｔ０が最も短く、フレーム長は、Ｔ０，Ｔ１，Ｔ２，・・・の順に長い。 FIG. 8 is a chart showing the relationship between data length and frame length. The storage unit 35 stores the relationship between the data length and the frame length as shown in FIG. The unit of the data length is bytes as described above. The unit of the frame length is seconds. In the example of FIG. 8, the frame length of the data frame whose data length is zero bytes is T0, the frame length of the data frame whose data length is 1 byte is T1, and the data frame whose data length is 2 bytes. The frame length is T2. In step S25, the control unit 36 reads the frame length corresponding to the data length read in step S24. Naturally, the larger the data length, the longer the frame length. Therefore, the frame length T0 is the shortest, and the frame length is longer in the order of T0, T1, T2,.
　次に、制御部３６は、記憶部３５に記憶されている無線器送信時間を、現在に記憶されている無線器送信時間にステップＳ２５で読み出したフレーム長を加算することによって算出される無線器送信時間に変更する（ステップＳ２６）。制御部３６は、データの送信及び受信が実行されていないと判定した場合（Ｓ２３：ＮＯ）、又は、ステップＳ２６を実行した後、第１タイマ３０が計時している計時時間が基準時間以上であるか否かを判定する（ステップＳ２７）。基準時間は、一定値であり、予め記憶部３５に記憶されている。 Next, the control unit 36 calculates the radio transmission time stored in the storage unit 35 by adding the frame length read in step S25 to the radio transmission time currently stored. The transmission time is changed (step S26). The control unit 36 determines that the data transmission and reception are not executed (S23: NO), or after executing step S26, the time measured by the first timer 30 is not less than the reference time. It is determined whether or not there is (step S27). The reference time is a constant value and is stored in the storage unit 35 in advance.
　制御部３６は、計時時間が基準時間未満であると判定した場合（Ｓ２７：ＮＯ）、ステップＳ２３を実行する。制御部３６は、第１タイマ３０の計時時間が基準時間となるまでに、第１通信部３３が送受信した全てのデータフレームのフレーム長を加算することによって無線器送信時間を算出する。前述したように、無線器バス１５に接続されている１つの装置が送信したデータは、無線器バス１５に接続されている他の装置の全てによって受信される。従って、第１通信部３３が送受信した全てのデータフレームのフレーム長を加算することによって無線器送信時間を算出することができる。 The control part 36 performs step S23, when it determines with time keeping time being less than reference | standard time (S27: NO). The control unit 36 calculates the radio transmission time by adding the frame lengths of all data frames transmitted and received by the first communication unit 33 until the time measured by the first timer 30 becomes the reference time. As described above, the data transmitted by one device connected to the radio bus 15 is received by all of the other devices connected to the radio bus 15. Therefore, the radio transmission time can be calculated by adding the frame lengths of all data frames transmitted and received by the first communication unit 33.
　制御部３６は、計時時間が基準時間以上であると判定した場合（Ｓ２７：ＹＥＳ）、第１タイマ３０に指示して計時を終了させ（ステップＳ２８）、記憶部３５に記憶されている無線器送信時間と１００との積を基準時間で除算することによって無線器バス占有率を算出する（ステップＳ２９）。次に、制御部３６は、記憶部３５に記憶されている無線器バス占有率を、ステップＳ２９で算出した無線器バス占有率に変更し（ステップＳ３０）、無線器バス占有率の算出処理を終了する。 When it is determined that the measured time is equal to or greater than the reference time (S27: YES), the control unit 36 instructs the first timer 30 to end the time measurement (step S28), and the wireless device stored in the storage unit 35 is stored. The radio bus occupation ratio is calculated by dividing the product of the transmission time and 100 by the reference time (step S29). Next, the control unit 36 changes the wireless device bus occupancy rate stored in the storage unit 35 to the wireless device bus occupancy rate calculated in step S29 (step S30), and performs the wireless device bus occupancy rate calculation process. finish.
　制御部３６は、ＥＣＵバス１４ａ，１４ｂ夫々に係るＥＣＵバス占有率の算出処理を、無線器バス占有率の算出処理と同様に実行する。記憶部３５には、ＥＣＵバス１４ａ，１４ｂ夫々に係るＥＣＵバス占有率と、ＥＣＵバス１４ａ，１４ｂ夫々について、データが送信されている送信時間を示すＥＣＵ送信時間とが記憶されている。 The control unit 36 executes the ECU bus occupancy calculation processing for the ECU buses 14a and 14b in the same manner as the radio device bus occupancy calculation processing. The storage unit 35 stores an ECU bus occupation rate relating to each of the ECU buses 14a and 14b and an ECU transmission time indicating a transmission time during which data is transmitted for each of the ECU buses 14a and 14b.
　無線器バス占有率の算出処理の説明において、無線器バス１５、第１タイマ３０、第１通信部３３、無線器送信時間及び無線器バス占有率夫々を、ＥＣＵバス１４ａ、第２タイマ３１ａ、第２通信部３４ａ、ＥＣＵバス１４ａに係るＥＣＵ送信時間、及び、ＥＣＵバス１４ａに係るＥＣＵバス占有率に置き換える。これにより、ＥＣＵバス１４ａに係るＥＣＵバス占有率の算出処理を説明することができる。 In the description of the calculation process of the radio equipment bus occupancy rate, the radio equipment bus 15, the first timer 30, the first communication unit 33, the radio equipment transmission time, and the radio equipment bus occupancy ratio are respectively represented as an ECU bus 14a, a second timer 31a, The second communication unit 34a, the ECU transmission time related to the ECU bus 14a, and the ECU bus occupation rate related to the ECU bus 14a are replaced. Thereby, the calculation process of the ECU bus occupancy rate related to the ECU bus 14a can be described.
　同様に、無線器バス占有率の算出処理の説明において、無線器バス１５、第１タイマ３０、第１通信部３３、無線器送信時間及び無線器バス占有率夫々を、ＥＣＵバス１４ｂ、第２タイマ３１ｂ、第２通信部３４ｂ、ＥＣＵバス１４ｂに係るＥＣＵ送信時間、及び、ＥＣＵバス１４ｂに係るＥＣＵバス占有率に置き換える。これにより、ＥＣＵバス１４ｂに係るＥＣＵバス占有率の算出処理を説明することができる。 Similarly, in the description of the wireless device bus occupancy rate calculation process, the wireless device bus 15, the first timer 30, the first communication unit 33, the wireless device transmission time, and the wireless device bus occupancy rate are respectively represented by the ECU bus 14 b, The timer 31b, the second communication unit 34b, the ECU transmission time related to the ECU bus 14b, and the ECU bus occupation ratio related to the ECU bus 14b are replaced. As a result, the ECU bus occupancy rate calculation process related to the ECU bus 14b can be described.
　ＥＣＵバス１４ａ，１４ｂ夫々に係るＥＣＵバス占有率の算出処理は、無線器バス占有率の算出処理と同様に周期的に実行される。このため、記憶部３５に記憶されている無線器バス占有率、及び、２つのＥＣＵバス占有率は、経時的に変更される。
　制御部３６は、算出部及び第２の算出部として機能する。 The ECU bus occupancy rate calculation process related to each of the ECU buses 14a and 14b is periodically executed in the same manner as the wireless device bus occupancy rate calculation process. For this reason, the radio device bus occupation ratio and the two ECU bus occupation ratios stored in the storage unit 35 are changed over time.
The control unit 36 functions as a calculation unit and a second calculation unit.
　図９は応答処理の手順を示すフローチャートである。制御部３６は、第１通信部３３が無線器１３の有線通信部２１から要求データを受信した場合に応答処理を実行する。応答処理では、制御部３６は、記憶部３５に記憶されている無線器バス占有率を読み出し（ステップＳ３１）、読み出した無線器バス占有率が第１基準率、例えば５０％未満であるか否かを判定する（ステップＳ３２）。第１基準率は、一定値であり、記憶部３５に予め記憶されている。 FIG. 9 is a flowchart showing the procedure of response processing. The control unit 36 executes response processing when the first communication unit 33 receives request data from the wired communication unit 21 of the wireless device 13. In the response process, the control unit 36 reads out the wireless device bus occupancy rate stored in the storage unit 35 (step S31), and whether or not the read out wireless device bus occupancy rate is less than a first reference rate, for example, 50%. Is determined (step S32). The first reference rate is a constant value and is stored in advance in the storage unit 35.
　制御部３６は、無線器バス占有率が第１基準率未満であると判定した場合（Ｓ３２：ＹＥＳ）、ステップＳ３１で読み出した無線器バス占有率に基づいて無線器送信間隔を決定する（ステップＳ３３）。前述したように、更新データを構成する全ての部分データの中で最後に送信される部分データを除く他の部分データのデータ長は、上限値であり、一定である。従って、無線器送信間隔が短い程、無線器１３の有線通信部２１が送信する部分データの単位時間当たりの送信量は大きい。このため、ステップＳ３３で無線器送信間隔を決定することによって、部分データの単位時間当たりの送信量が決定される。制御部３６は第２の決定部としても機能する。 When it is determined that the wireless device bus occupancy is less than the first reference rate (S32: YES), the control unit 36 determines the wireless device transmission interval based on the wireless device bus occupancy read in step S31 (step S31). S33). As described above, the data length of the other partial data excluding the partial data transmitted last among all the partial data constituting the update data is the upper limit value and is constant. Therefore, the shorter the wireless transmission interval, the larger the transmission amount per unit time of the partial data transmitted by the wired communication unit 21 of the wireless device 13. For this reason, the transmission amount per unit time of the partial data is determined by determining the radio transmission interval in step S33. The control unit 36 also functions as a second determination unit.
　図１０は、無線器バス占有率と送信間隔との関係を示す図表である。記憶部３５には、図１０に示すような無線器バス占有率と送信間隔との関係が記憶されている。図１０の例では、０％以上かつ１０％未満である無線器バス占有率には送信間隔Ｅ０が対応する。１０％以上かつ２０％未満である無線器バス占有率には、送信間隔Ｅ０よりも長い送信間隔Ｅ１が対応する。２０％以上かつ３０％未満である無線器バス占有率には、送信間隔Ｅ１よりも長い送信間隔Ｅ２が対応する。３０％以上かつ４０％未満である無線器バス占有率には、送信間隔Ｅ２よりも長い送信間隔Ｅ３が対応する。４０％以上かつ５０％未満である無線器バス占有率には、送信間隔Ｅ３よりも長い送信間隔Ｅ４が対応する。図１０の例では第１基準率は５０％である。 FIG. 10 is a chart showing the relationship between the wireless device bus occupation ratio and the transmission interval. The storage unit 35 stores the relationship between the radio bus occupancy and the transmission interval as shown in FIG. In the example of FIG. 10, the transmission interval E0 corresponds to the radio equipment bus occupation ratio that is 0% or more and less than 10%. A transmission interval E1 that is longer than the transmission interval E0 corresponds to a radio bus occupation ratio that is 10% or more and less than 20%. A transmission interval E2 longer than the transmission interval E1 corresponds to a radio bus occupation ratio of 20% or more and less than 30%. A transmission interval E3 longer than the transmission interval E2 corresponds to a radio bus occupation ratio of 30% or more and less than 40%. A transmission interval E4 longer than the transmission interval E3 corresponds to a radio bus occupancy rate of 40% or more and less than 50%. In the example of FIG. 10, the first reference rate is 50%.
　ステップＳ３３では、制御部３６は、無線器送信間隔を、ステップＳ３１で読み出した無線器バス占有率に対応する送信間隔に決定する。図１０の例では、ステップＳ３１で読み出された無線器バス占有率が１５％である場合、ステップＳ３３では、無線器送信間隔は、送信間隔Ｅ１に決定される。
　なお、ステップＳ３３では、制御部３６は、ステップＳ３１で読み出した無線器バス占有率を演算式に代入することによって送信間隔を算出し、無線器送信間隔を、算出した送信間隔に決定してもよい。 In step S33, the control unit 36 determines the radio transmission interval to be a transmission interval corresponding to the radio bus occupancy read in step S31. In the example of FIG. 10, when the wireless device bus occupation ratio read in step S31 is 15%, in step S33, the wireless device transmission interval is determined as the transmission interval E1.
In step S33, the control unit 36 calculates the transmission interval by substituting the wireless device bus occupancy read in step S31 into the arithmetic expression, and determines the wireless device transmission interval as the calculated transmission interval. Good.
　次に、制御部３６は、ステップＳ３３で決定した無線器送信間隔を示す応答データの送信を第１通信部３３に指示する（ステップＳ３４）。これにより、第１通信部３３は、制御部３６がステップＳ３３で決定した無線器送信間隔を示す応答データを無線器１３の有線通信部２１に送信する。
　前述したように、無線器送信間隔を決定することによって、部分データの単位時間当たりの送信量が決定される。このため、制御部３６がステップＳ３３で決定した無線器送信間隔を示す応答データを送信することは、制御部３６がステップＳ３３で決定した単位時間当たりの送信量を示す応答データを送信することに相当する。
　第１通信部３３は第２の送信部としても機能する。無線器送信間隔を示す応答データは送信量データに相当する。 Next, the control unit 36 instructs the first communication unit 33 to transmit response data indicating the radio transmission interval determined in step S33 (step S34). As a result, the first communication unit 33 transmits response data indicating the wireless transmission interval determined by the control unit 36 in step S33 to the wired communication unit 21 of the wireless device 13.
As described above, the transmission amount per unit time of the partial data is determined by determining the radio transmission interval. For this reason, transmitting the response data indicating the radio transmission interval determined in step S33 by the control unit 36 means transmitting response data indicating the transmission amount per unit time determined by the control unit 36 in step S33. Equivalent to.
The first communication unit 33 also functions as a second transmission unit. The response data indicating the radio transmission interval corresponds to transmission amount data.
　制御部３６は、無線器バス占有率が第１基準率以上であると判定した場合（Ｓ３２：ＮＯ）、送信不可を示す応答データの送信を有線通信部２１に指示する。これにより、有線通信部２１は、送信不可を示す応答データを無線器１３に送信する。
　制御部３６は、ステップＳ３４，Ｓ３５の一方を実行した後、応答処理を終了する。 When it is determined that the wireless device bus occupation rate is equal to or higher than the first reference rate (S32: NO), the control unit 36 instructs the wired communication unit 21 to transmit response data indicating that transmission is not possible. Thereby, the wired communication unit 21 transmits response data indicating that transmission is impossible to the wireless device 13.
After executing one of steps S34 and S35, the controller 36 ends the response process.
　以上のように、第１通信部３３が無線器１３の有線通信部２１から要求データを受信した場合において、無線器バス占有率が第１基準率未満であるとき、第１通信部３３は無線器送信間隔を示す応答データを送信する。無線器送信間隔は無線器バス占有率が小さい程短い。このため、図５に示すように、無線器バス占有率が小さい場合、無線器１３の有線通信部２１は短い無線器送信間隔で部分データを繰り返し送信し、無線器バス占有率が大きい場合、有線通信部２１は長い無線器送信間隔で部分データを繰り返し送信する。前述したように、無線器バス占有率の算出処理と応答処理とは、時分割方式で行われる。 As described above, when the first communication unit 33 receives the request data from the wired communication unit 21 of the wireless device 13 and the wireless device bus occupancy is less than the first reference rate, the first communication unit 33 is wireless. Response data indicating the transmitter transmission interval is transmitted. The radio transmission interval is shorter as the radio bus occupancy is smaller. For this reason, as shown in FIG. 5, when the wireless device bus occupancy is small, the wired communication unit 21 of the wireless device 13 repeatedly transmits partial data at short wireless device transmission intervals, and when the wireless device bus occupancy is large, The wired communication unit 21 repeatedly transmits partial data at long wireless transmission intervals. As described above, the wireless device bus occupancy rate calculation process and the response process are performed in a time division manner.
　従って、無線器バス占有率の算出と、無線器送信間隔の決定とは、無線器１３の有線通信部２１が部分データの送信を開始する前だけではなく、有線通信部２１が部分データを繰り返し送信している間も行われる。結果、無線器１３の有線通信部２１が部分データを繰り返し送信している間に、無線器バス占有率が変化した場合も、無線器送信間隔、即ち、部分データの単位時間当たりの送信量は、変化した無線器バス占有率に応じて変更される。 Therefore, the calculation of the wireless device bus occupancy rate and the determination of the wireless device transmission interval are not only performed before the wired communication unit 21 of the wireless device 13 starts transmitting the partial data, but the wired communication unit 21 repeats the partial data. This is also done while sending. As a result, even when the wireless device bus occupancy changes while the wired communication unit 21 of the wireless device 13 repeatedly transmits the partial data, the wireless device transmission interval, that is, the transmission amount of the partial data per unit time is , Changed according to the changed radio bus occupancy.
　無線器バス占有率に基づいて、無線器送信間隔、即ち、部分データの単位時間当たりの送信量が変更され、無線器バス１５では部分データを除く他のデータの単位時間当たりの送信量を変更することはない。このため、部分データを除く他のデータの単位時間当たりの送信量を低下させることなく、中継装置１０の第１通信部３３は部分データを受信することができる。 Based on the radio bus occupation ratio, the radio transmission interval, that is, the transmission amount per unit time of partial data is changed, and the radio bus 15 changes the transmission amount per unit time of other data excluding partial data Never do. For this reason, the 1st communication part 33 of the relay apparatus 10 can receive partial data, without reducing the transmission amount per unit time of the other data except partial data.
　通信システム１では、車両１００が停止しているために、部分データを除く他のデータの単位時間当たりの送信量が低下した場合には、部分データが短い送信間隔で送信され、車両１００が走行しているために、部分データを除く他のデータの単位時間当たりの送信量が増加した場合には、部分データが長い送信間隔で送信される。 In the communication system 1, since the vehicle 100 is stopped, when the transmission amount per unit time of other data excluding the partial data decreases, the partial data is transmitted at a short transmission interval, and the vehicle 100 travels. Therefore, when the transmission amount per unit time of other data excluding the partial data increases, the partial data is transmitted at a long transmission interval.
　無線器バス占有率が第１基準率以上である間、中継装置１０の第１通信部３３から無線器１３の有線通信部２１に送信不可の応答データが送信されるので、有線通信部２１は部分データの送信を停止している。このため、無線器バス１５において、部分データを除く他のデータの送信に悪影響を与える確率は低い。 While the wireless device bus occupancy is equal to or higher than the first reference rate, response data that cannot be transmitted is transmitted from the first communication unit 33 of the relay device 10 to the wired communication unit 21 of the wireless device 13, so the wired communication unit 21 Partial data transmission is stopped. For this reason, in the radio | wireless machine bus | bath 15, the probability of having a bad influence on transmission of the other data except partial data is low.
　図１１は、中継装置１０の更新データ送信処理の手順を示すフローチャートである。図１１には、ＥＣＵバス１４ａを介して更新データを送信するための更新データ送信処理が示されている。制御部３６は、第１通信部３３が、無線器１３の有線通信部２１から、ＥＣＵ１１ａ，１２ａ中の１つの制御プログラムに係る更新データの一部分である部分データを受信した場合に更新データ送信処理を実行する。記憶部３５には、第２通信部３４ａが部分データを送信する時間間隔であるＥＣＵ送信間隔と、第２通信部３４ａが部分データを送信したＥＣＵ送信回数と、第２通信部３４ａのＥＣＵ送信回数に係る第２閾値とが記憶されている。第２閾値は、一定値であり、自然数である。 FIG. 11 is a flowchart showing a procedure of update data transmission processing of the relay device 10. FIG. 11 shows an update data transmission process for transmitting update data via the ECU bus 14a. The control unit 36 performs update data transmission processing when the first communication unit 33 receives partial data that is a part of update data related to one control program in the ECUs 11a and 12a from the wired communication unit 21 of the wireless device 13. Execute. The storage unit 35 includes an ECU transmission interval, which is a time interval at which the second communication unit 34a transmits partial data, an ECU transmission count at which the second communication unit 34a transmits partial data, and an ECU transmission of the second communication unit 34a. A second threshold value related to the number of times is stored. The second threshold value is a constant value and is a natural number.
　制御部３６は、ＥＣＵバス１４ａに係るＥＣＵバス占有率を記憶部３５から読み出し（ステップＳ４１）、読み出したＥＣＵバス占有率が第２基準率、例えば４０％未満であるか否かを判定する（ステップＳ４２）。第２基準率は、一定値であり、予め記憶部３５に記憶されている。制御部３６は、ＥＣＵバス占有率が第２基準率以上であると判定した場合（Ｓ４２：ＮＯ）、ステップＳ４１を実行する。ここで、制御部３６は、ＥＣＵバス占有率が第２基準率以上であると判定してから一定時間が経過した後にステップＳ４１を実行する。制御部３６は、ＥＣＵバス１４ａに係るＥＣＵバス占有率が第２基準率未満となるまで待機する。 The control unit 36 reads the ECU bus occupancy relating to the ECU bus 14a from the storage unit 35 (step S41), and determines whether or not the read ECU bus occupancy is less than a second reference rate, for example, 40% ( Step S42). The second reference rate is a constant value and is stored in the storage unit 35 in advance. When it is determined that the ECU bus occupancy is equal to or higher than the second reference rate (S42: NO), control unit 36 executes step S41. Here, the control unit 36 executes step S41 after a predetermined time has elapsed since it was determined that the ECU bus occupancy is equal to or higher than the second reference rate. The control unit 36 stands by until the ECU bus occupation rate related to the ECU bus 14a becomes less than the second reference rate.
　制御部３６は、ＥＣＵバス占有率が第２基準率未満であると判定した場合（Ｓ４２：ＹＥＳ）、ステップＳ４１で読み出したＥＣＵバス占有率に基づいて、第２通信部３４ａのＥＣＵ送信間隔を決定する（ステップＳ４３）。更新データを構成する全ての部分データの中で最後に送信される部分データを除く他の部分データのデータ長は、上限値であり、一定である。従って、第２通信部３４ａのＥＣＵ送信間隔が短い程、第２通信部３４ａが送信する部分データの単位時間当たりの送信量は大きい。このため、ステップＳ４３で第２通信部３４ａのＥＣＵ送信間隔を決定することによって、部分データの単位時間当たりの送信量が決定される。制御部３６は決定部としても機能する。 When it is determined that the ECU bus occupancy rate is less than the second reference rate (S42: YES), the control unit 36 determines the ECU transmission interval of the second communication unit 34a based on the ECU bus occupancy rate read in step S41. Determine (step S43). The data length of the other partial data except the partial data transmitted last among all the partial data constituting the update data is an upper limit value and is constant. Accordingly, the shorter the ECU transmission interval of the second communication unit 34a, the larger the transmission amount per unit time of the partial data transmitted by the second communication unit 34a. For this reason, the transmission amount per unit time of the partial data is determined by determining the ECU transmission interval of the second communication unit 34a in step S43. The control unit 36 also functions as a determination unit.
　図１２は、ＥＣＵバス占有率と送信間隔との関係を示す図表である。記憶部３５には、図１２に示すようなＥＣＵバス占有率と送信間隔との関係が記憶されている。図１２の例では、０％以上かつ１０％未満であるＥＣＵバス占有率には送信間隔Ｇ０が対応する。１０％以上かつ２０％未満であるＥＣＵバス占有率には、送信間隔Ｇ０よりも長い送信間隔Ｇ１が対応する。２０％以上かつ３０％未満であるＥＣＵバス占有率には、送信間隔Ｇ１よりも長い送信間隔Ｇ２が対応する。３０％以上かつ４０％未満であるＥＣＵバス占有率には、送信間隔Ｇ２よりも長い送信間隔Ｇ３が対応する。図１２の例では第２基準率は４０％である。 FIG. 12 is a chart showing the relationship between the ECU bus occupation ratio and the transmission interval. The storage unit 35 stores the relationship between the ECU bus occupation ratio and the transmission interval as shown in FIG. In the example of FIG. 12, the transmission interval G0 corresponds to the ECU bus occupation ratio that is 0% or more and less than 10%. A transmission interval G1 longer than the transmission interval G0 corresponds to an ECU bus occupancy rate of 10% or more and less than 20%. A transmission interval G2 that is longer than the transmission interval G1 corresponds to an ECU bus occupation ratio that is 20% or more and less than 30%. A transmission interval G3 longer than the transmission interval G2 corresponds to an ECU bus occupancy rate of 30% or more and less than 40%. In the example of FIG. 12, the second reference rate is 40%.
　ステップＳ４３では、制御部３６は、ＥＣＵ送信間隔を、ステップＳ４１で読み出したＥＣＵバス占有率に対応する送信間隔に決定する。図１２の例では、ステップＳ４１で読み出されたＥＣＵバス占有率が２５％である場合、ステップＳ４３では、ＥＣＵ送信間隔は送信間隔Ｇ２に決定される。
　なお、ステップＳ４３では、制御部３６は、ステップＳ４１で読み出したＥＣＵバス占有率を演算式に代入することによって送信間隔を算出し、第２通信部３４ａのＥＣＵ送信間隔を、算出した送信間隔に決定してもよい。 In step S43, the control unit 36 determines the ECU transmission interval as a transmission interval corresponding to the ECU bus occupation rate read in step S41. In the example of FIG. 12, when the ECU bus occupancy read in step S41 is 25%, in step S43, the ECU transmission interval is determined as the transmission interval G2.
In step S43, the control unit 36 calculates the transmission interval by substituting the ECU bus occupancy read in step S41 into the arithmetic expression, and sets the ECU transmission interval of the second communication unit 34a to the calculated transmission interval. You may decide.
　次に、制御部３６は、記憶部３５に記憶されている第２通信部３４ａのＥＣＵ送信間隔を、ステップＳ４３で決定したＥＣＵ送信間隔に変更する（ステップＳ４４）。次に、制御部３６は、第２通信部３４ａのＥＣＵ送信回数をゼロに設定し（ステップＳ４５）、送信タイマ３２ａに指示して計時を開始させ（ステップＳ４６）、第２通信部３４ａに部分データの送信を指示する（ステップＳ４７）。これにより、第２通信部３４ａは、部分データをＥＣＵ１１ａ，１２ａに送信する。ＥＣＵ１１ａ，１２ａの一方は、受信した部分データを破棄し、ＥＣＵ１１ａ，１２ａの他方は、受信した部分データを記憶する。 Next, the control unit 36 changes the ECU transmission interval of the second communication unit 34a stored in the storage unit 35 to the ECU transmission interval determined in step S43 (step S44). Next, the control unit 36 sets the number of ECU transmissions of the second communication unit 34a to zero (step S45), instructs the transmission timer 32a to start measuring time (step S46), and causes the second communication unit 34a to Data transmission is instructed (step S47). Thereby, the 2nd communication part 34a transmits partial data to ECU11a, 12a. One of the ECUs 11a and 12a discards the received partial data, and the other of the ECUs 11a and 12a stores the received partial data.
　次に、制御部３６は、記憶部３５に記憶されている第２通信部３４ａのＥＣＵ送信回数を１だけインクリメントし（ステップＳ４８）、更新データ、即ち、全ての部分データの送信が完了したか否かを判定する（ステップＳ４９）。制御部３６は、更新データの送信が完了していないと判定した場合（Ｓ４９：ＮＯ）、送信タイマ３２ａが計時している計時時間が、記憶部３５に記憶されているＥＣＵ送信間隔、即ち、ステップＳ４３で決定したＥＣＵ送信間隔以上であるか否かを判定する（ステップＳ５０）。 Next, the control unit 36 increments the ECU transmission count of the second communication unit 34a stored in the storage unit 35 by 1 (step S48), and whether update data, that is, transmission of all partial data has been completed. It is determined whether or not (step S49). When the control unit 36 determines that the transmission of the update data is not completed (S49: NO), the time measured by the transmission timer 32a is the ECU transmission interval stored in the storage unit 35, that is, It is determined whether or not it is equal to or longer than the ECU transmission interval determined in step S43 (step S50).
　制御部３６は、計時時間がＥＣＵ送信間隔未満であると判定した場合（Ｓ５０：ＮＯ）、ステップＳ５０を再び実行し、計時時間がＥＣＵ送信間隔以上となるまで待機する。制御部３６は、計時時間がＥＣＵ送信間隔以上であると判定した場合（Ｓ５０：ＹＥＳ）、送信タイマ３２ａに指示して計時を終了させ（ステップＳ５１）、記憶部３５に記憶されているＥＣＵ送信回数が第２閾値であるか否かを判定する（ステップＳ５２）。 When it is determined that the timed time is less than the ECU transmission interval (S50: NO), the control unit 36 executes step S50 again and waits until the timed time becomes equal to or longer than the ECU transmission interval. When it is determined that the measured time is equal to or longer than the ECU transmission interval (S50: YES), the control unit 36 instructs the transmission timer 32a to end the time measurement (step S51), and transmits the ECU transmission stored in the storage unit 35. It is determined whether or not the number of times is the second threshold (step S52).
　制御部３６は、ＥＣＵ送信回数が第２閾値ではない、即ち、ＥＣＵ送信回数が第２閾値未満であると判定した場合（Ｓ５２：ＮＯ）、ステップＳ４６を実行する。制御部３６は、更新データの送信が完了するか、又は、ＥＣＵ送信回数が第２閾値に到達するまで、第２通信部３４ａに指示してＥＣＵ送信回数で部分データを繰り返し送信させる。
　制御部３６は、ＥＣＵ送信回数が第２閾値であると判定した場合（Ｓ５２：ＹＥＳ）、ステップＳ４１を再び実行する。第２通信部３４ａは、ＥＣＵバス１４ａに係るＥＣＵバス占有率が第２基準率未満である場合、再び、ステップＳ４３を実行し、第２通信部３４ａはステップＳ４３で新たに決定したＥＣＵ送信間隔で部分データを繰り返し送信する。 When it is determined that the ECU transmission frequency is not the second threshold value, that is, the ECU transmission frequency is less than the second threshold value (S52: NO), the control unit 36 executes Step S46. The control unit 36 instructs the second communication unit 34a to repeatedly transmit the partial data at the ECU transmission count until the transmission of the update data is completed or the ECU transmission count reaches the second threshold value.
When it is determined that the ECU transmission count is the second threshold (S52: YES), the control unit 36 executes Step S41 again. The second communication unit 34a executes step S43 again when the ECU bus occupancy rate related to the ECU bus 14a is less than the second reference rate, and the second communication unit 34a re-executes the ECU transmission interval newly determined in step S43. Send partial data repeatedly.
　制御部３６は、更新データの送信が完了したと判定した場合（Ｓ４９：ＹＥＳ）、送信タイマ３２ａに指示して計時を終了させ（ステップＳ５３）、第２通信部３４ａに、更新データの送信が完了したことを示す完了データの送信を指示する（ステップＳ５４）。これにより、第２通信部３４ａは、完了データを、ＥＣＵバス１４ａを介してＥＣＵ１１ａ，１２ａに送信し、ＥＣＵ１１ａ，１２ａの中で部分データを記憶しているＥＣＵに更新データの送信完了を通知する。
　制御部３６は、ステップＳ５４を実行した後、更新データ送信処理を終了する。 When it is determined that the transmission of the update data is completed (S49: YES), the control unit 36 instructs the transmission timer 32a to end the time measurement (step S53), and the second communication unit 34a transmits the update data. The transmission of completion data indicating completion is instructed (step S54). Accordingly, the second communication unit 34a transmits the completion data to the ECUs 11a and 12a via the ECU bus 14a, and notifies the ECU that stores the partial data in the ECUs 11a and 12a of the completion of transmission of the update data. .
After executing step S54, the control unit 36 ends the update data transmission process.
　制御部３６は、ＥＣＵバス１４ｂを介して更新データを送信するための更新データ送信処理を、ＥＣＵバス１４ａを介して更新データを送信するための更新データ送信処理と同様に実行する。
　ＥＣＵバス１４ａを介して更新データを送信するための更新データ送信処理の説明において、ＥＣＵ１１ａ，１２ａ、ＥＣＵバス１４ａ、送信タイマ３２ａ、第２通信部３４ａ夫々を、ＥＣＵ１１ｂ，１２ｂ、ＥＣＵバス１４ｂ、送信タイマ３２ｂ、第２通信部３４ｂに置き換える。これにより、ＥＣＵバス１４ｂを介して更新データを送信するための更新データ送信処理を説明することができる。 The control unit 36 executes an update data transmission process for transmitting update data via the ECU bus 14b in the same manner as an update data transmission process for transmitting update data via the ECU bus 14a.
In the description of the update data transmission process for transmitting update data via the ECU bus 14a, the ECUs 11a and 12a, the ECU bus 14a, the transmission timer 32a, and the second communication unit 34a are respectively connected to the ECUs 11b and 12b, the ECU bus 14b, and the transmission. It replaces with the timer 32b and the 2nd communication part 34b. Thereby, the update data transmission process for transmitting the update data via the ECU bus 14b can be described.
　図１３は、中継装置１０からＥＣＵ１１ａ，１２ａへの更新データの送信の説明図である。ここでは、第２通信部３４ａのＥＣＵ送信回数に係る第２閾値が３である場合における更新データの送信の一例が示されている。 FIG. 13 is an explanatory diagram of transmission of update data from the relay device 10 to the ECUs 11a and 12a. Here, an example of transmission of update data when the second threshold value related to the number of times of ECU transmission of the second communication unit 34a is 3 is shown.
　図１３に示すように、制御部３６は、第２通信部３４ａに更新データの送信を開始させる場合、第２通信部３４ａのＥＣＵ送信間隔を、ＥＣＵバス１４ａに係るＥＣＵバス占有率に対応する送信間隔に決定する。第２通信部３４ａは、制御部３６が決定したＥＣＵ送信間隔、即ち、制御部３６が決定した単位時間当たりの送信量で部分データを繰り返し送信する。制御部３６は、決定したＥＣＵ送信間隔で第２通信部３４ａが部分データを繰り返し送信するように、部分データの送信を指示している。第２通信部３４ａは送信部として機能する。 As illustrated in FIG. 13, when the control unit 36 causes the second communication unit 34a to start transmitting update data, the ECU transmission interval of the second communication unit 34a corresponds to the ECU bus occupation ratio related to the ECU bus 14a. Determine the transmission interval. The second communication unit 34a repeatedly transmits the partial data at the ECU transmission interval determined by the control unit 36, that is, the transmission amount per unit time determined by the control unit 36. The control unit 36 instructs the transmission of the partial data so that the second communication unit 34a repeatedly transmits the partial data at the determined ECU transmission interval. The second communication unit 34a functions as a transmission unit.
　制御部３６は、部分データが送信される都度、第２通信部３４ａのＥＣＵ送信回数を１だけインクリメントする。制御部３６は、ＥＣＵ送信回数が第２閾値、即ち、３となった場合、再び、ＥＣＵバス１４ａに係るＥＣＵバス占有率に対応する第２通信部３４ａのＥＣＵ送信間隔を読み出し、第２通信部３４ａのＥＣＵ送信回数をゼロに設定する。第２通信部３４ａは、制御部３６が新たに決定したＥＣＵ送信間隔で部分データをＥＣＵ１１ａ，１２ａに繰り返し送信する。 The control unit 36 increments the ECU transmission count of the second communication unit 34a by 1 each time the partial data is transmitted. When the ECU transmission count reaches the second threshold value, ie, 3, the control unit 36 again reads the ECU transmission interval of the second communication unit 34a corresponding to the ECU bus occupancy relating to the ECU bus 14a, and performs the second communication. The number of ECU transmissions of the unit 34a is set to zero. The second communication unit 34a repeatedly transmits the partial data to the ECUs 11a and 12a at the ECU transmission interval newly determined by the control unit 36.
　以上のように、第２通信部３４ａのＥＣＵ送信回数が、第２通信部３４ａのＥＣＵ送信回数に係る第２閾値となる都度、制御部３６は、ＥＣＵバス１４ａに係るＥＣＵバス占有率に対応する第２通信部３４ａのＥＣＵ送信間隔を決定し、第２通信部３４ａは、制御部３６が決定したＥＣＵ送信間隔で部分データを繰り返し送信する。また、前述したように、ＥＣＵバス１４ａに係るＥＣＵバス占有率の算出処理と、ＥＣＵバス１４ａを介して更新データを送信するための更新データ送信処理とは、時分割方式で行われる。 As described above, whenever the ECU transmission count of the second communication unit 34a becomes the second threshold value related to the ECU transmission count of the second communication unit 34a, the control unit 36 corresponds to the ECU bus occupation ratio related to the ECU bus 14a. The second communication unit 34a determines the ECU transmission interval of the second communication unit 34a, and the second communication unit 34a repeatedly transmits the partial data at the ECU transmission interval determined by the control unit 36. Further, as described above, the ECU bus occupancy calculation process for the ECU bus 14a and the update data transmission process for transmitting update data via the ECU bus 14a are performed in a time-sharing manner.
　従って、ＥＣＵバス１４ａに係るＥＣＵバス占有率の算出と、第２通信部３４ａが送信するＥＣＵ送信間隔の決定とは、第２通信部３４ａが部分データの送信を開始する前だけではなく、第２通信部３４ａが部分データを繰り返し送信している間も行われる。結果、第２通信部３４ａが部分データを繰り返し送信している間に、ＥＣＵバス１４ａに係るＥＣＵバス占有率が変化した場合も、ＥＣＵ送信間隔、即ち、部分データの単位時間当たりの送信量は、変化したＥＣＵバス占有率に応じて変更される。 Therefore, the calculation of the ECU bus occupancy ratio related to the ECU bus 14a and the determination of the ECU transmission interval transmitted by the second communication unit 34a are not only before the second communication unit 34a starts transmitting the partial data, This is also performed while the communication unit 34a repeatedly transmits partial data. As a result, even when the ECU bus occupancy rate related to the ECU bus 14a changes while the second communication unit 34a repeatedly transmits the partial data, the ECU transmission interval, that is, the transmission amount of the partial data per unit time is It is changed according to the changed ECU bus occupation rate.
　第２通信部３４ａは、更新データの送信が完了した場合、完了データをＥＣＵ１１ａ，１２ａに送信し、ＥＣＵ１１ａ，１２ａの中で部分データを記憶しているＥＣＵに更新データの送信完了を通知する。 When the transmission of the update data is completed, the second communication unit 34a transmits the completion data to the ECUs 11a and 12a, and notifies the ECU that stores the partial data in the ECUs 11a and 12a of the completion of the transmission of the update data.
　また、図１３に示すように、ＥＣＵバス１４ａに係るＥＣＵバス占有率が小さい場合、第２通信部３４ａは短いＥＣＵ送信間隔で部分データを繰り返し送信する。ＥＣＵバス１４ａに係るＥＣＵバス占有率が大きい場合、第２通信部３４ａは長いＥＣＵ送信間隔で部分データを繰り返し送信する。 As shown in FIG. 13, when the ECU bus occupancy associated with the ECU bus 14a is small, the second communication unit 34a repeatedly transmits partial data at short ECU transmission intervals. When the ECU bus occupation ratio related to the ECU bus 14a is large, the second communication unit 34a repeatedly transmits partial data at a long ECU transmission interval.
　以上のように、ＥＣＵバス１４ａに係るＥＣＵバス占有率に基づいて、第２通信部３４ａのＥＣＵ送信間隔、即ち、部分データの単位時間当たりの送信量を変更し、ＥＣＵバス１４ａでは、部分データを除く他のデータの単位時間当たりの送信量を変更することはない。このため、部分データを除く他のデータの単位時間当たりの送信量を低下させることはなく、ＥＣＵ１１ａ，１２ａに更新データが送信される。 As described above, the ECU transmission interval of the second communication unit 34a, that is, the transmission amount per unit time of the partial data is changed based on the ECU bus occupation ratio related to the ECU bus 14a. The transmission amount per unit time of other data other than is not changed. For this reason, update data is transmitted to ECU11a, 12a, without reducing the transmission amount per unit time of other data except partial data.
　通信システム１では、車両１００が停止しているために、部分データを除く他のデータの単位時間当たりの送信量が低下した場合には、部分データが短い送信間隔で送信され、車両１００が走行しているために、部分データを除く他のデータの単位時間当たりの送信量が増加した場合には、部分データが長い送信間隔で送信される。 In the communication system 1, since the vehicle 100 is stopped, when the transmission amount per unit time of other data excluding the partial data decreases, the partial data is transmitted at a short transmission interval, and the vehicle 100 travels. Therefore, when the transmission amount per unit time of other data excluding the partial data increases, the partial data is transmitted at a long transmission interval.
　ＥＣＵバス１４ａに係るＥＣＵバス占有率が第２基準率以上である間、第２通信部３４ａは部分データの送信を停止している。このため、ＥＣＵバス１４ａにおいて、部分データを除く他のデータの送信に悪影響を与える確率は低い。
　中継装置１０からＥＣＵ１１ｂ，１２ｂへの更新データも、中継装置１０からＥＣＵ１１ａ，１２ａへの更新データと同様に送信される。従って、第２通信部３４ｂも送信部として機能する。 While the ECU bus occupation rate related to the ECU bus 14a is equal to or higher than the second reference rate, the second communication unit 34a stops transmitting the partial data. For this reason, in the ECU bus 14a, the probability of adversely affecting the transmission of other data excluding partial data is low.
Update data from the relay device 10 to the ECUs 11b and 12b is also transmitted in the same manner as update data from the relay device 10 to the ECUs 11a and 12a. Accordingly, the second communication unit 34b also functions as a transmission unit.
　図１４はＥＣＵ１１ａの要部構成を示すブロック図である。ＥＣＵ１１ａは、出力部４０、通信部４１、記憶部４２及び制御部４３を有する。これらはバス４４に各別に接続されている。出力部４０は、更に、ＥＣＵ１１ａに対応する電気機器に接続されている。通信部４１は、更に、ＥＣＵバス１４ａに接続されている。 FIG. 14 is a block diagram showing a main configuration of the ECU 11a. The ECU 11 a includes an output unit 40, a communication unit 41, a storage unit 42, and a control unit 43. These are connected to the bus 44 separately. The output unit 40 is further connected to an electric device corresponding to the ECU 11a. The communication unit 41 is further connected to the ECU bus 14a.
　出力部４０は、制御部４３の指示に従って、電気機器に制御データを出力する。電気機器は、通信部４１から入力された制御データに応じた動作を行う。
　通信部４１は、ＥＣＵバス１４ａを介して、中継装置１０の第２通信部３４ａ及びＥＣＵ１２ａからデータを受信する。部分データは、通信部４１が第２通信部３４ａから受信するデータの１つである。通信部４１は、制御部４３の指示に従って、データを、中継装置１０の第２通信部３４ａ及びＥＣＵ１２ａにデータを送信する。 The output unit 40 outputs control data to the electrical device in accordance with an instruction from the control unit 43. The electric device performs an operation according to the control data input from the communication unit 41.
The communication unit 41 receives data from the second communication unit 34a and the ECU 12a of the relay device 10 via the ECU bus 14a. The partial data is one of data that the communication unit 41 receives from the second communication unit 34a. The communication unit 41 transmits the data to the second communication unit 34a and the ECU 12a of the relay device 10 according to the instruction of the control unit 43.
　記憶部４２は例えば不揮発性メモリである。記憶部４２には、制御プログラムＰ３及び更新プログラムＰ４が記憶されている。
　制御部４３は図示しないＣＰＵを有する。制御部４３のＣＰＵは、制御プログラムＰ３を実行することによって、出力部４０に接続されている電気機器の動作を制御する制御処理と、通信部４１が受信した部分データを記憶部４２に記憶する記憶処理とを実行する。制御プログラムＰ３は、制御部４３のＣＰＵに、制御処理及び記憶処理を実行させるためのコンピュータプログラムである。 The storage unit 42 is, for example, a nonvolatile memory. The storage unit 42 stores a control program P3 and an update program P4.
The control unit 43 has a CPU (not shown). The CPU of the control unit 43 stores the control process for controlling the operation of the electrical equipment connected to the output unit 40 and the partial data received by the communication unit 41 in the storage unit 42 by executing the control program P3. Perform storage processing. The control program P3 is a computer program for causing the CPU of the control unit 43 to execute control processing and storage processing.
　制御処理では、制御部４３は、出力部４０に指示して、電気機器に制御データを出力させることによって、電気機器の動作を制御する。
　制御部４３は、通信部４１が部分データを受信した場合に記憶処理を実行する。記憶処理では、制御部４３は、通信部４１が受信した部分データのデータフレームに含まれている識別情報に基づいて、通信部４１が受信した部分データを破棄すべきか否かを判定する。制御部４３は、通信部４１が受信した部分データを破棄すべきと判定した場合、この部分データを破棄する。制御部４３は、通信部４１が受信した部分データを破棄すべきではないと判定した場合、この部分データを記憶部４２に記憶する。 In the control process, the control unit 43 instructs the output unit 40 to control the operation of the electric device by causing the electric device to output control data.
The control unit 43 performs storage processing when the communication unit 41 receives partial data. In the storage process, the control unit 43 determines whether or not the partial data received by the communication unit 41 should be discarded based on the identification information included in the data frame of the partial data received by the communication unit 41. When it is determined that the partial data received by the communication unit 41 should be discarded, the control unit 43 discards the partial data. When determining that the partial data received by the communication unit 41 should not be discarded, the control unit 43 stores the partial data in the storage unit 42.
　制御部４３は、記憶部４２に更新データ、即ち、全ての部分データが記憶されている場合に更新プログラムＰ４を実行し、制御プログラムＰ３の更新処理を実行する。更新プログラムＰ４は、制御部４３のＣＰＵに制御プログラムＰ３の更新処理を実行させるためのコンピュータプログラムである。更新処理では、制御部４３は、記憶部４２に記憶されている更新データに基づいて、制御プログラムＰ３を更新する。 The control unit 43 executes the update program P4 when update data, that is, all partial data is stored in the storage unit 42, and executes update processing of the control program P3. The update program P4 is a computer program for causing the CPU of the control unit 43 to execute update processing of the control program P3. In the update process, the control unit 43 updates the control program P3 based on the update data stored in the storage unit 42.
　ＥＣＵ１１ｂ，１２ａ，１２ｂ夫々はＥＣＵ１１ａと同様に構成されている。ＥＣＵ１１ａの構成の説明において、ＥＣＵ１１ａ，１２ａ夫々をＥＣＵ１２ａ，１１ａに置き換えることによって、ＥＣＵ１２ａの構成を説明することができる。また、ＥＣＵ１１ａの構成の説明において、ＥＣＵ１１ａ，１２ａ、ＥＣＵバス１４ａ及び第２通信部３４ａ夫々を、ＥＣＵ１１ｂ，１２ｂ，ＥＣＵバス１４ｂ及び第２通信部３４ｂに置き換えることによって、ＥＣＵ１１ｂの構成を説明することができる。更に、ＥＣＵ１１ａの構成の説明において、ＥＣＵ１１ａ，１２ａ、ＥＣＵバス１４ａ及び第２通信部３４ａ夫々を、ＥＣＵ１２ｂ，１１ｂ，ＥＣＵバス１４ｂ及び第２通信部３４ｂに置き換えることによって、ＥＣＵ１２ｂの構成を説明することができる。 The ECUs 11b, 12a, and 12b are each configured in the same manner as the ECU 11a. In the description of the configuration of the ECU 11a, the configuration of the ECU 12a can be described by replacing the ECUs 11a and 12a with the ECUs 12a and 11a, respectively. In the description of the configuration of the ECU 11a, the configuration of the ECU 11b will be described by replacing the ECUs 11a and 12a, the ECU bus 14a, and the second communication unit 34a with the ECUs 11b, 12b, the ECU bus 14b, and the second communication unit 34b, respectively. Can do. Further, in the description of the configuration of the ECU 11a, the configuration of the ECU 12b will be described by replacing the ECUs 11a, 12a, the ECU bus 14a, and the second communication unit 34a with the ECUs 12b, 11b, the ECU bus 14b, and the second communication unit 34b, respectively. Can do.
　なお、ＥＣＵバス１４ａ，１４ｂ夫々について、部分データの単位時間当たりの送信量を決定する構成は、ＥＣＵ送信間隔を決定する構成に限定されない。直接に、部分データの単位時間当たりの送信量が決定されてもよい。同様に、無線器バス１５についても、部分データの単位時間当たりの送信量を決定する構成は、無線器送信間隔を決定する構成に限定されない。直接に、部分データの単位時間当たりの送信量が決定されてもよい。 The configuration for determining the transmission amount of partial data per unit time for each of the ECU buses 14a and 14b is not limited to the configuration for determining the ECU transmission interval. Directly, the transmission amount of the partial data per unit time may be determined. Similarly, with regard to the wireless device bus 15, the configuration for determining the transmission amount of partial data per unit time is not limited to the configuration for determining the wireless device transmission interval. Directly, the transmission amount of the partial data per unit time may be determined.
　また、中継装置１０の第２通信部３４ａ，３４ｂ中の１つが部分データの送信を開始するタイミングは、第１通信部３３が全ての部分データの受信を完了する前であってもよいし、第１通信部３３が全ての部分データの受信を完了した後であってもよい。
　更に、無線器１３の無線通信部２０がサーバ１６から一度に受信する更新データの数は、１つに限定されず、２つ以上であってもよい。例えば、無線通信部２０は、サーバ１６からＥＣＵ１１ａ，１１ｂ夫々の制御プログラムＰ３を更新するための更新データを受信する構成であってもよい。 In addition, the timing at which one of the second communication units 34a and 34b of the relay device 10 starts transmission of partial data may be before the first communication unit 33 completes reception of all partial data, It may be after the 1st communication part 33 completes reception of all the partial data.
Furthermore, the number of update data that the wireless communication unit 20 of the wireless device 13 receives from the server 16 at a time is not limited to one and may be two or more. For example, the wireless communication unit 20 may be configured to receive update data for updating the control programs P3 of the ECUs 11a and 11b from the server 16.
　また、無線器送信間隔は、無線器バス占有率だけではなく、車両１００の速度、又は、車両１００のシフトレバーの位置等の車両１００の状態にも基づいて設定されてもよい。同様に、第２通信部３４ａ，３４ｂ夫々に係るＥＣＵ送信間隔は、ＥＣＵバス１４ａ，１４ｂ夫々に係るＥＣＵバス占有率だけではなく、車両１００の状態にも基づいて設定されてもよい。 Further, the radio transmission interval may be set based not only on the radio bus occupancy rate but also on the state of the vehicle 100 such as the speed of the vehicle 100 or the position of the shift lever of the vehicle 100. Similarly, the ECU transmission interval related to each of the second communication units 34a and 34b may be set based not only on the ECU bus occupation ratio related to each of the ECU buses 14a and 14b but also on the state of the vehicle 100.
　また、中継装置１０に接続されるＥＣＵバスの数は、２つに限定されず、３つ以上であってもよい。更に、中継装置１０に接続される無線器バス１５の数は、１つに限定されず、２つ以上であってもよい。また、ＥＣＵバスに接続されるＥＣＵの数は、２つに限定されず、１つ又は３つ以上であってもよい。各ＥＣＵバスに接続されるＥＣＵの数は同じでなくてもよい。また、無線器バスに無線器１３以外に通信装置が接続されてもよい。 Further, the number of ECU buses connected to the relay device 10 is not limited to two, and may be three or more. Further, the number of radio buses 15 connected to the relay apparatus 10 is not limited to one, and may be two or more. Further, the number of ECUs connected to the ECU bus is not limited to two, and may be one or three or more. The number of ECUs connected to each ECU bus may not be the same. A communication device other than the wireless device 13 may be connected to the wireless device bus.
　更に、ＥＣＵバス及び無線器バス夫々を介した通信のプロトコルは、ＣＡＮプロトコル又はＣＡＮ－ＦＤプロトコルに限定されず、例えば、イーサネット（登録商標）のプロトコルであってもよい。ＥＣＵバス及び無線器バス夫々を介した通信のプロトコルがＣＡＮプロトコル及びＣＡＮ－ＦＤプロトコルのいずれとも異なる場合、ＥＣＵバス１４ａ，１４ｂ及び無線器バス１５夫々はツイストペア線に限定されない。 Further, the communication protocol via the ECU bus and the radio bus is not limited to the CAN protocol or the CAN-FD protocol, and may be, for example, an Ethernet (registered trademark) protocol. When the communication protocol via the ECU bus and the radio bus is different from both the CAN protocol and the CAN-FD protocol, the ECU buses 14a and 14b and the radio bus 15 are not limited to the twisted pair lines.
　開示された本実施の形態はすべての点で例示であって、制限的なものではないと考えられるべきである。本発明の範囲は、上述した意味ではなく、請求の範囲によって示され、請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。 The disclosed embodiment is an example in all respects and should be considered not to be restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
　１　通信システム
　１０　中継装置
　１１ａ，１１ｂ，１２ａ，１２ｂ　ＥＣＵ（通信装置）
　１４ａ，１４ｂ　ＥＣＵバス（第１通信線）
　１５　無線器バス（第２通信線）
　３３　第１通信部（第２の送信部、受信部）
　３４ａ，３４ｂ　第２通信部（送信部）
　３６　制御部（算出部、決定部、第２の算出部、第２の決定部）
　Ｐ２，Ｐ３　制御プログラム（コンピュータプログラム） DESCRIPTION OF SYMBOLS 1 Communication system 10 Relay apparatus 11a, 11b, 12a, 12b ECU (communication apparatus)
14a, 14b ECU bus (first communication line)
15 Radio bus (second communication line)
33 1st communication part (2nd transmission part, receiving part)
34a, 34b Second communication unit (transmission unit)
36 control unit (calculation unit, determination unit, second calculation unit, second determination unit)
P2, P3 control program (computer program)

Claims (8)

  1. 　複数の通信線に接続され、該複数の通信線中の２つの通信線夫々に接続されている２つの通信装置間の通信を中継する中継装置において、
    　前記複数の通信線中の１つである第１通信線について、データが送信されている送信時間が単位時間当たりに占める占有率を算出する算出部と、
    　該算出部が算出した占有率に基づいて、コンピュータプログラムを更新するための更新データの一部分である部分データの単位時間当たりの送信量を決定する決定部と、
    　該決定部が決定した単位時間当たりの送信量で、前記部分データを、前記第１通信線を介して繰り返し送信する送信部と
    　を備えることを特徴とする中継装置。     In a relay device that is connected to a plurality of communication lines and relays communication between two communication devices connected to two communication lines in the plurality of communication lines,
    A calculation unit that calculates an occupancy ratio of a transmission time during which data is transmitted per unit time for a first communication line that is one of the plurality of communication lines;
    A determination unit that determines a transmission amount per unit time of partial data that is a part of update data for updating the computer program based on the occupation ratio calculated by the calculation unit;
    A relay apparatus comprising: a transmission unit that repeatedly transmits the partial data via the first communication line at a transmission amount per unit time determined by the determination unit.
  2. 　第２通信線について、データが送信されている送信時間が単位時間当たりに占める占有率を算出する第２の算出部と、
    　該第２の算出部が算出した占有率に基づいて、前記部分データの単位時間当たりの送信量を決定する第２の決定部と、
    　該第２の決定部が決定した単位時間当たりの送信量を示す送信量データを、前記第２通信線を介して送信する第２の送信部と、
    　前記第２通信線を介して前記部分データを受信する受信部と
    　を備えることを特徴とする請求項１に記載の中継装置。     For the second communication line, a second calculation unit that calculates an occupation ratio that the transmission time during which data is transmitted occupies per unit time;
    A second determination unit that determines a transmission amount per unit time of the partial data based on the occupation ratio calculated by the second calculation unit;
    A second transmission unit that transmits transmission amount data indicating the transmission amount per unit time determined by the second determination unit via the second communication line;
    The relay apparatus according to claim 1, further comprising: a receiving unit that receives the partial data via the second communication line.
  3. 　前記決定部は、前記部分データの送信間隔を決定することによって、前記部分データの単位時間当たりの送信量を決定し、
    　前記送信部は、該決定部が決定した送信間隔で、前記部分データを、前記第１通信線を介して繰り返し送信すること
    　を特徴とする請求項１又は請求項２に記載の中継装置。     The determining unit determines a transmission amount per unit time of the partial data by determining a transmission interval of the partial data;
    The relay apparatus according to claim 1, wherein the transmission unit repeatedly transmits the partial data via the first communication line at a transmission interval determined by the determination unit.
  4. 　前記算出部の算出及び前記決定部の決定は、該送信部が前記部分データを繰り返し送信している間に行われること
    　を特徴とする請求項１から請求項３のいずれか１つに記載の中継装置。     The calculation by the calculation unit and the determination by the determination unit are performed while the transmission unit repeatedly transmits the partial data. Relay device.
  5. 　前記送信部は、前記算出部が算出した占有率が所定率以上である間、前記部分データの送信を停止していること
    　を特徴とする請求項１から請求項４のいずれか１つに記載の中継装置。     5. The transmission unit according to claim 1, wherein the transmission unit stops transmission of the partial data while the occupation rate calculated by the calculation unit is equal to or greater than a predetermined rate. 6. Relay device.
  6. 　請求項１から請求項５のいずれか１つに記載の中継装置と、
    　前記２つの通信装置と
    　を備えることを特徴とする通信システム。     A relay device according to any one of claims 1 to 5,
    A communication system comprising the two communication devices.
  7. 　通信線について、データが送信されている送信時間が単位時間当たりに占める占有率を算出し、
    　算出した占有率に基づいて、コンピュータプログラムを更新するための更新データの一部分である部分データの単位時間当たりの送信量を決定し、
    　決定した単位時間当たりの送信量で、前記部分データを、前記通信線を介して繰り返し送信すること
    　を特徴とする送信方法。     For the communication line, calculate the occupancy rate that the transmission time during which data is being transmitted occupies per unit time,
    Based on the calculated occupancy rate, determine the transmission amount per unit time of partial data that is a part of update data for updating the computer program,
    The transmission method characterized by repeatedly transmitting the partial data through the communication line with the determined transmission amount per unit time.
  8. 　通信線について、データが送信されている送信時間が単位時間当たりに占める占有率を算出し、
    　算出した占有率に基づいて、コンピュータプログラムを更新するための更新データの一部分である部分データの単位時間当たりの送信量を決定し、
    　決定した単位時間当たりの送信量で、前記部分データが、前記通信線を介して繰り返し送信されるようにデータの送信を指示する
    　処理をコンピュータに実行させることを特徴とするコンピュータプログラム。
          For the communication line, calculate the occupancy rate that the transmission time during which data is being transmitted occupies per unit time,
    Based on the calculated occupancy rate, determine the transmission amount per unit time of partial data that is a part of update data for updating the computer program,
    A computer program that causes a computer to execute a process of instructing data transmission so that the partial data is repeatedly transmitted via the communication line at a determined transmission amount per unit time.
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