JP6428474B2 - Relay device - Google Patents

Description

  The present application relates to a relay device that relays data output to an in-vehicle communication line to an external device.

  Conventionally, an in-vehicle communication system in which a plurality of ECUs (Electronic Control Units) are connected to an in-vehicle communication line has been constructed. Each of the ECUs of the in-vehicle communication system performs communication by inputting / outputting data via the in-vehicle communication line. Further, the vehicle is provided with a connector connected to the in-vehicle communication line so that diagnosis of the state of the ECU, rewriting of the computer program stored in the ECU, and the like can be performed from the outside. A method for preventing unauthorized data from being output to the in-vehicle communication line from the outside is proposed because unauthorized data may be output from the outside to the in-vehicle communication line via the connector. (For example, refer to Patent Document 1).

  The security device of Patent Document 1 includes a switch interposed in a communication line that connects a connector and an in-vehicle communication line (main bus) of an in-vehicle communication system. The security device turns on the switch when data input through the connector has permission information in advance, and turns off the switch when a predetermined end condition is satisfied. By performing such control, the security device of Patent Document 1 can prevent unauthorized data that is not permitted from being output from the outside to the in-vehicle communication line.

JP 2013-118609 A

  However, the security device described in Patent Literature 1 cannot communicate with the external device and the ECU when data having permission information is not input from the outside. Therefore, when data is output to the outside from the ECU via the in-vehicle communication line, there is a problem that a dedicated external device capable of outputting data having permission information is required.

  The purpose of the present application is to prevent unauthorized data from being output from the outside to the in-vehicle communication line, even when it is not connected to a dedicated external device, and to connect the data output to the in-vehicle communication line. Another object of the present invention is to provide a relay device that can relay to an external device.

A relay device according to an aspect of the present invention is a relay device that is connected to an in-vehicle communication line and an external device and relays data output to the in-vehicle communication line to the external device, the in-vehicle communication line and the external device A communication line connected to the communication line, a switch that electrically connects the in-vehicle communication line and the external device, a receiving unit that receives data output to the in-vehicle communication line, A control unit that turns on the switch when the receiving unit starts receiving data.

  The present application can be realized not only as a relay apparatus including such a characteristic processing unit, but also as a relay method having such characteristic processing as a step, and for causing a computer to execute such a step. It can be realized as a program. Further, it can be realized as a semiconductor integrated circuit that realizes part or all of the relay device, and can be realized as another system including the relay device.

  According to the above, even if it is not connected to a dedicated external device, the data output to the in-vehicle communication line can be connected while preventing unauthorized data from being output to the in-vehicle communication line from the outside. It is possible to provide a relay device that can relay to an external device.

1 is a block diagram showing a configuration of a communication system in Embodiment 1. FIG. It is explanatory drawing which shows an example of the operation | movement which a relay apparatus performs. It is explanatory drawing which shows an example of the operation | movement which a relay apparatus performs. It is a flowchart which shows the process sequence in case a relay apparatus controls switch. It is a block diagram which shows the structure of the communication system in a modification. It is a block diagram which shows the structure of the communication system in Embodiment 2. It is a flowchart which shows the process sequence in case a relay apparatus controls switch.

[Description of Embodiment of the Present Invention]
First, embodiments of the present invention will be listed and described. Moreover, you may combine arbitrarily at least one part of embodiment described below.

(1) A relay device according to an aspect of the present invention is a relay device that is connected to an in-vehicle communication line and an external device and relays data output to the in-vehicle communication line to the external device, and the in-vehicle communication line And a communication line for connecting the external device, a switch that is interposed in the communication line, and that electrically connects the in-vehicle communication line and the external device, and reception for receiving data output to the in-vehicle communication line And a control unit that turns on the switch when the receiving unit starts receiving data.

  In the present application, the communication line connects the in-vehicle communication line and the external device. The switch is interposed in the communication line. The receiving unit receives data output to the in-vehicle communication line. The control unit turns on the switch when the receiving unit starts receiving data. For example, when the control unit turns on the switch only when the receiving unit starts to receive data, the relay device relays only the data output to the in-vehicle communication line to the external device via the communication line, Data from the apparatus can be prevented from being output to the in-vehicle communication line. Therefore, even if the relay device is not connected to a dedicated external device, it connects the data output to the in-vehicle communication line while preventing unauthorized data from being output from the outside to the in-vehicle communication line. Can be relayed to a connected external device.

(2) pre-Symbol control unit after starting the reception the reception unit of the data, the configuration over the period corresponding to the specified data size from the data being received are as to turn on the switch is preferred .
(3) A relay device according to an aspect of the present invention is a relay device that is connected to an in-vehicle communication line and an external device and relays data output to the in-vehicle communication line to the external device, and the in-vehicle communication line And a communication line connecting the external device, a switch interposed in the communication line, a receiving unit for receiving data output to the in-vehicle communication line, and reception when the receiving unit starts receiving data And a control unit that turns on the switch for a period corresponding to the data size specified from the data therein.

  In the present application, when the receiving unit starts receiving data, the specifying unit specifies a data size from the data being received. The control unit turns on the switch for a period corresponding to the data size specified by the specifying unit after the receiving unit starts receiving data. Since the relay device can detect the data reception completion timing until the reception unit completes the data reception, it turns off the switch after detecting that the reception unit has received the last bit of the data. The switch can be turned off at an earlier timing. Therefore, the relay device can better prevent the data output from the external device from being output to the in-vehicle communication line after relaying the data output to the in-vehicle communication line to the external device.

( 4 ) The reception unit is configured to be able to receive each of data output at a plurality of transmission rates, and accepts a selection operation of one transmission rate received by the reception unit from the plurality of transmission rates. A configuration further including a transmission rate receiving unit is preferable.

  In the present application, the receiving unit is configured to receive each of the data output at a plurality of transmission rates. The transmission rate accepting unit accepts an operation for selecting one transmission rate received by the receiving unit from the plurality of transmission rates. Therefore, the relay device can be connected to each in-vehicle communication line in which communication is performed at different transmission speeds and relay data to an external device.

( 5 ) The structure comprised so that attachment or detachment to the said in-vehicle communication line and an external device is respectively preferable.

  In this application, it is comprised so that attachment or detachment to each in-vehicle communication line and an external device is possible. Therefore, the relay device can relay data regardless of the types of the in-vehicle communication line and the external device. Further, when it is necessary to output data from the external device to the in-vehicle communication line, the user can remove the relay device and connect the external device directly to the in-vehicle communication line, so that convenience is improved.

( 6 ) It is mounted on a vehicle, and the communication line has an external connection connector connected to one end and the in-vehicle communication line connected to the other end, and accepts an operation related to on / off of the switch. Preferably, a switch operation receiving unit is further provided, and the control unit controls on / off of the switch according to an operation received by the switch operation receiving unit.

  In the present application, the relay device is mounted on a vehicle. The communication line has an external connection connector connected to one end, and an in-vehicle communication line connected to the other end. The switch operation reception unit receives an operation related to on / off of the switch. The control unit controls on / off of the switch according to the operation received by the switch operation receiving unit. Therefore, by mounting the relay device in the vehicle in advance, it is possible to prevent the user from forgetting to connect the relay device between the in-vehicle communication line and the external device, and convenience is improved. Further, for example, when data needs to be output from the external device to the in-vehicle communication line, the user can perform an operation of turning on the switch, so that convenience is improved. Further, for example, when it is necessary to temporarily prevent data output from the in-vehicle communication line from being output to the external device, the user can perform an operation to turn off the switch, which improves convenience. .

[Details of the embodiment of the present invention]
A specific example of the relay device according to the embodiment of the present invention will be described below with reference to the drawings. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to the claim are included.

(Embodiment 1)
FIG. 1 is a block diagram illustrating a configuration of a communication system according to the first embodiment. The communication system according to Embodiment 1 includes a relay device 1, an in-vehicle communication line 2, and an external device 3, and data output to the in-vehicle communication line 2 is output to the external device 3 through the relay device 1. The in-vehicle communication line 2 is routed in the vehicle C and is, for example, a twisted pair cable in which a pair of electric wires are twisted together. A plurality of ECUs 41 to 44 are connected to the in-vehicle communication line 2. The ECUs 41 to 44 are in-vehicle devices that communicate with each other by inputting / outputting data according to a communication protocol such as CAN (Controller Area Network) via the in-vehicle communication line 2. Each of the ECUs 41 to 44 controls the sensors, actuators, and the like connected to its own device based on the communication result. Hereinafter, the ECUs 41 to 44 are also referred to as ECU4. Further, in FIG. 1, it is shown that four ECUs 41 to 44 are connected to the in-vehicle communication line 2, but three or less ECUs 4 may be connected to the in-vehicle communication line 2, Five or more ECUs 4 may be connected to the in-vehicle communication line 2. Further, an example in which the ECU 4 performs communication according to the CAN protocol will be mainly described below.

  An in-vehicle connector 5 is connected to the in-vehicle communication line 2. The in-vehicle connector 5 is, for example, a so-called diagnostic connector provided in the front of the vehicle interior, and is configured so that a dedicated diagnostic device can be connected. The diagnostic apparatus can communicate information related to failure of the ECU 4, sensors connected to the ECU 4, actuators, and the like with each ECU 4 via the in-vehicle connector 5.

  The external device 3 includes a connector that can be connected to the in-vehicle connector 5, and is an apparatus configured to be able to input data output from the in-vehicle device such as the ECU 4 to the in-vehicle communication line 2 via the in-vehicle connector 5. A portable terminal device such as a notebook personal computer can be used. The external device 3 acquires vehicle information such as the vehicle speed and the coolant temperature of engine cooling water from the ECU 4 and the like, and displays the acquired vehicle information on the display screen. And external devices that are not dedicated to the vehicle C, such as devices.

The user can cause the external device 3 to acquire information on the in-vehicle device connected to the in-vehicle communication line 2 by directly connecting the external device 3 to the in-vehicle connector 5.
However, if the ECU 4 has a problem due to data output from the external device 3 that is not dedicated to the vehicle C to the in-vehicle communication line 2 via the in-vehicle connector 5, there is a possibility of adversely affecting the vehicle control. Therefore, the user prevents the data output from the external device 3 from entering the in-vehicle communication line 2 by interposing the relay device 1 between the in-vehicle communication line 2 and the external device 3, Data output from the in-vehicle device such as the ECU 4 to the in-vehicle communication line 2 is input to the external device 3. Hereinafter, the configuration and processing of the relay apparatus 1 will be described.

  The relay device 1 includes a control unit 11, a reception unit 12, a communication line 13, a switch 14, a first connector 15, and a second connector 16. The control unit 11 is a microcomputer including, for example, one or a plurality of CPUs (Central Processing Units), a multi-core CPU, and the like, and a memory. A control program is stored in the memory of the control unit 11, and the CPU of the control unit 11 controls on / off of the switch 14 by reading the control program from the memory.

  The communication line 13 is a communication line similar to the in-vehicle communication line 2 and is, for example, a twisted pair cable. A first connector 15 and a second connector 16 are connected to both ends of the communication line 13. The first connector 15 is configured to be connectable to the in-vehicle connector 5, and the second connector 16 is configured to be connectable to the external device 3. In addition, a switch 14 is interposed in the communication line 13. The switch 14 is various switching elements such as an analog switch and a semiconductor switch that are in a state in which the communication line 13 is connected when turned on and in a state in which the communication line 13 is cut off when turned off. When the communication line 13 is composed of a twisted pair cable, for example, the switch 14 is interposed in each electric wire included in the twisted pair cable. The switch 14 is switched on and off in accordance with an instruction from the control unit 11. It is assumed that the switch 14 is in an off state at the start of the operation of the relay device 1.

  The receiving unit 12 is, for example, a receiving circuit that is connected to the communication line 13 between the switch 14 and the first connector 15 and receives data output from the in-vehicle communication line 2 to the communication line 13 via the first connector 15. The receiving unit 12 is configured to detect the potential of the communication line 13 at every predetermined sampling timing, and outputs a bit value constituting data to the control unit 11 based on the detected potential. The predetermined sampling timing is appropriately set according to the transmission speed of data output to the in-vehicle communication line 2.

  The relay device 1 may be configured to operate by being supplied with electric power from the vehicle C when connected to the in-vehicle communication line 2 by the first connector 15. Further, the relay device 1 may be configured to operate by being supplied with electric power from the external device 3 when connected to the external device 3 by the second connector 16. Furthermore, the relay apparatus 1 may be configured to incorporate a battery and operate with power from the built-in battery.

  In the relay device 1 configured as described above, the first connector 15 and the in-vehicle connector 5, and the second connector 16 and the connector of the external device 3 are connected by the user. Connect to the external device 3. The relay device 1 connected to each of the in-vehicle communication line 2 and the external device 3 relays the data output to the in-vehicle communication line 2 to the external device 3, but the in-vehicle communication about the data output from the external device 3. The on / off of the switch 14 is controlled so as to prevent entry into the line 2. Below, an example of the operation | movement which the relay apparatus 1 performs is demonstrated.

  2 and 3 are explanatory diagrams illustrating an example of an operation performed by the relay device 1. FIG. 2 shows a block diagram of the communication system when the relay device 1 relays the data output to the in-vehicle communication line 2 to the external device 3. FIG. 3 shows a block diagram of the communication system when the relay device 1 prevents the data output from the external device 3 from entering the in-vehicle communication line 2.

  In the example shown in FIG. 2, data output from the ECU 44 to the in-vehicle communication line 2 is input to the communication line 13 via the in-vehicle connector 5 and the first connector 15. The receiving unit 12 of the relay apparatus 1 detects the potential of the communication line 13 represented by the input data, and outputs each bit value constituting the data to the control unit 11 based on the detected potential. When the control unit 11 detects that the bit value input by the receiving unit 12 is a value representing the first bit of data, that is, SOF (Start Of Frame), the control unit 11 turns the switch 14 from OFF to ON. As the control unit 11 controls the switch 14 from OFF to ON in this way, the relay device 1 can output the data input to the communication line 13 to the external device 3 via the second connector 16.

  When the control unit 11 detects that the bit value input by the receiving unit 12 that is receiving data is a value representing a data size, that is, a DLC (Data Length Code) value, the control unit 11 represents the bit value. The switch 14 is kept on for a period corresponding to the data size. The period corresponding to the data size is, for example, the time required for the data having the data size to be output from the communication line 13 to the external device 3. After the period has elapsed, the control unit 11 turns off the switch 14. The control unit 11 controls the switch 14 from on to off in this way, and after the data output to the in-vehicle communication line 2 has been output to the external device 3, the switch 14 is turned off. Therefore, as shown in FIG. 3, the relay device 1 has the switch 14 turned off even when data is output from the external device 3, so that the data enters the in-vehicle communication line 2. Can be prevented.

  Next, a processing procedure when the relay apparatus 1 controls the switch 14 will be described. FIG. 4 is a flowchart showing a processing procedure when the relay apparatus 1 controls the switch 14. The control unit 11 of the relay device 1 determines whether or not the reception unit 12 has started receiving data output to the in-vehicle communication line 2 (step S11). For example, the control unit 11 determines by detecting whether or not the bit value output from the receiving unit 12 is a value indicating SOF. The control unit 11 functions as a reception determination unit by executing a control program in step S11. When it is determined that the data reception has not started (S11: NO), the control unit 11 waits until the data reception is started.

  If it is determined that data reception has started (S11: YES), the control unit 11 turns on the switch 14 (step S12). Thereafter, the control unit 11 specifies the data size of the data based on the bit value of the data that the reception unit 12 has started receiving (step S13). For example, the control unit 11 detects that the bit value output from the reception unit 12 is a DLC value, and specifies the data size based on the detected DLC value. For example, the control unit 11 detects that the bit value output from the reception unit 12 in step S11 is a value indicating SOF, and then counts the number of bit values output from the reception unit 12 to thereby determine the DLC. Whether it is a value or not is detected. The control unit 11 functions as a specifying unit by executing a control program in step S13.

  Next, the control unit 11 sets the ON time of the switch 14 based on the specified data size (step S14). For example, the control unit 11 stores in advance a correspondence relationship between the data size and the on time in its own memory, and sets the on time of the switch 14 by referring to the correspondence relationship. Thereafter, the control unit 11 determines whether or not the set ON time of the switch 14 has elapsed (step S15). For example, the control unit 11 is provided with a timer counter (not shown). The control unit 11 turns on the switch 14 and starts measuring time with the timer counter. It is determined whether or not it has elapsed. The control unit 11 may measure time by repeatedly executing a program in which a command for measuring time is described after turning on the switch 14. If it is determined that the on-time has not elapsed (S15: NO), the control unit 11 waits for processing until the on-time has elapsed.

  When it is determined that the on-time has elapsed (S15: YES), the control unit 11 turns off the switch 14 (step S16), and thereafter ends the process.

  The controller 11 relays the data sequentially output to the in-vehicle communication line 2 to the external device 3 by repeatedly executing the process shown in FIG.

  With the above configuration and processing, the relay device 1 turns on the switch 14 only when the reception unit 12 starts receiving data, so that the relay device 1 can only receive data output to the in-vehicle communication line 2. Relaying to the external device 3 via the communication line 13 can prevent data from the external device 3 from being output to the in-vehicle communication line 2. Therefore, even if the relay device 1 is not connected to the dedicated external device 3, the relay device 1 is output to the in-vehicle communication line 2 while preventing unauthorized data from being output to the in-vehicle communication line 2 from the outside. Data can be relayed to the connected external device 3.

  Further, since the relay device 1 can detect the data reception completion timing until the reception unit 12 completes the data reception, the relay device 1 detects that the reception unit 12 has received the last bit of the data. After that, the switch 14 can be turned off at an earlier timing than the switch 14 is turned off. Therefore, the relay device 1 better prevents the data output from the external device 3 from being output to the in-vehicle communication line 2 after relaying the data output to the in-vehicle communication line 2 to the external device 3. Can do. Note that the relay apparatus 1 may turn off the switch 14 after detecting that the receiving unit 12 has received the last bit of data, that is, the bit corresponding to the last bit of EOF (End Of Frame). Good. Even in this case, the data output to the in-vehicle communication line 2 can be relayed to the connected external device 3 while preventing unauthorized data from being output to the in-vehicle communication line 2 from the outside.

  The relay device 1 is configured to be detachable from the in-vehicle communication line 2 and the external device 3 via the first connector 15 and the second connector 16, respectively. Therefore, the relay device 1 can relay data regardless of the types of the in-vehicle communication line 2 and the external device 3. Further, when it is necessary to output data from the external device 3 to the in-vehicle communication line 2, the user can remove the relay device 1 and directly connect the external device 3 to the in-vehicle communication line 2, thereby improving convenience. .

(Modification)
In the modification, an example in which the relay apparatus 1 is configured to be able to receive each of the data output at a plurality of transmission rates will be described. Since the other configurations and operations except for the configurations and operations described below are the same as those in the first embodiment, detailed description on the same configurations and descriptions of the operations and effects are omitted for the sake of brevity.

  FIG. 5 is a block diagram showing a configuration of a communication system in a modification. The receiving unit 12 of the relay apparatus 1 in the modified example is configured to be able to receive data output at a plurality of transmission rates. For example, the receiving unit 12 is configured to be able to detect the potential of the communication line 13 at a plurality of sampling timings, and detects the potential of the communication line 13 at one sampling timing in accordance with an instruction from the control unit 11. Further, the relay device 1 in the modification includes a changeover switch 17. For example, the changeover switch 17 is provided on the outer surface of the casing of the relay device 1 and is configured to be able to select one transmission rate from a plurality of data transmission rates. The changeover switch 17 receives a selection operation of one transmission rate from the user and outputs a signal representing the received transmission rate to the control unit 11. Based on the signal output from the changeover switch 17, the control unit 11 instructs the receiving unit 12 to detect the potential of the communication line 13 at one sampling timing corresponding to the transmission rate represented by the signal. The changeover switch 17 corresponds to a transmission rate reception unit.

  With the configuration and processing described above, the relay device 1 can connect to each in-vehicle communication line 2 that performs communication at different transmission speeds and relay data to the external device 3. That is, since the user of the relay device 1 can connect to the in-vehicle communication line 2 that communicates at various transmission speeds, the in-vehicle communication line 2 for each of the plurality of vehicles C that communicate at different transmission speeds. Can be relayed to the external device 3.

(Embodiment 2)
It has been described that the relay device 1 according to the first embodiment and the modification is configured to be detachable from the in-vehicle communication line 2 and the external device 3. An example in which the relay device 1 according to the second embodiment is mounted in the vehicle C in advance and connected to the in-vehicle communication line 2 will be described. Since the other configurations and operations except for the configurations and operations described below are the same as those in the first embodiment, detailed description on the same configurations and descriptions of the operations and effects are omitted for the sake of brevity.

  FIG. 6 is a block diagram illustrating a configuration of a communication system according to the second embodiment. The relay device 1 according to the second embodiment is mounted on the vehicle C, and one end of the communication line 13 is directly connected to the in-vehicle communication line 2 instead of providing the first connector 15. In addition, the relay device 1 includes the in-vehicle connector 5 instead of providing the configuration of the second connector 16, and the other end of the communication line 13 is connected to the in-vehicle connector 5.

  The relay device 1 according to the second embodiment configured as described above relays the data output to the in-vehicle communication line 2 to the external device 3 as in the first embodiment. At this time, the data output to the in-vehicle communication line 2 is output to the external device 3 via the communication line 13 and the in-vehicle connector 5. Further, the relay device 1 according to the second embodiment prevents the data output from the external device 3 from entering the in-vehicle communication line 2 as in the first embodiment.

  Furthermore, the relay apparatus 1 of Embodiment 2 has three modes, a normal mode, an on mode, and an off mode. In the normal mode, the control unit 11 performs the same control as that of the first embodiment on the switch 14. In the on mode, the control unit 11 controls the switch 14 so as to continue the on state. That is, the relay device 1 in the on mode can cause the data output from the external device 3 to enter the in-vehicle communication line 2. In the off mode, the control unit 11 controls the switch 14 so that the off state continues. That is, the relay device 1 in the off mode does not relay the output data to the external device 3 even when the data is output to the in-vehicle communication line 2. For example, the user operates a vehicle-mounted device connected to the ECU 4 such as a switch or a car navigation device provided in the vehicle interior, and performs the selection operation of the three modes. Then, ECU4 connected to the said vehicle equipment outputs the mode selection data which concerns on selection operation, and the relay apparatus 1 receives mode selection data in the receiving part 12. FIG. The relay device 1 changes its mode based on the received mode selection data. That is, the relay device 1 receives an operation related to the on / off of the switch 14 from the user, and controls the on / off of the switch 14 according to the received operation. At this time, the receiving unit 12 corresponds to a switch operation receiving unit.

  Next, a processing procedure when the relay apparatus 1 according to the second embodiment controls the switch 14 will be described. FIG. 7 is a flowchart showing a processing procedure when the relay apparatus 1 controls the switch 14. In addition, since the process of step S21 and step S24-step S28 is the same as the process of step S11 in FIG. 4 in Embodiment 1, and step S12-step S16, description is abbreviate | omitted.

  When it is determined that the control unit 11 of the relay device 1 has started receiving data (S21: YES), the control unit 11 determines whether the data that has started reception is mode selection data (step S22). . For example, the control unit 11 detects that the bit value output from the receiving unit 12 is a value indicating the ID of the data, and determines whether the bit value is mode selection data based on the detected ID value. For example, the control unit 11 may perform the determination based on whether or not the most recently received mode selection data is data for selecting the normal mode. When it determines with it not being mode selection data (S22: NO), the control part 11 determines whether an own apparatus is a normal mode (step S23). For example, the control unit 11 determines whether or not it is executing a program to be executed in the normal mode. When it determines with it being normal mode (S23: YES), the control part 11 advances a process after step S24. When it is determined that the mode is not the normal mode, that is, when it is determined that the mode is either the on mode or the off mode (S23: NO), the control unit 11 ends the process without controlling the switch 14.

  On the other hand, when it determines with it being mode selection data (S22: YES), the control part 11 determines whether the mode selection data which started reception are data which select ON mode (step S29). When it determines with it being the data which select ON mode (S29: YES), the control part 11 turns ON the switch 14 (step S30), and finishes a process after that. When it is determined that the data is not data for selecting the on mode, that is, when it is determined that the data is for selecting the normal mode or the off mode (S29: NO), the control unit 11 turns off the switch 14 (step S31), and the subsequent processing Finish.

  The control unit 11 executes the process shown in FIG. 7 repeatedly, thereby switching between the normal mode, the on mode, and the off mode to execute control on the switch 14.

  By mounting the relay device 1 in the vehicle C in advance by the above configuration and processing, it is possible to prevent the user from forgetting to connect the relay device 1 between the in-vehicle communication line 2 and the external device 3. Improves. For example, when it is necessary to output data from the external device 3 to the in-vehicle communication line 2, the user can perform an operation of turning on the switch 14, which improves convenience. Furthermore, for example, when it is necessary to temporarily prevent data output from the in-vehicle communication line 2 from being output to the external device 3, the user can perform an operation to turn off the switch 14, which is convenient. Will improve.

  In the first and second embodiments and the modification, it has been described that the relay device 1 relays data according to the CAN protocol from the in-vehicle communication line 2 to the external device 3. However, data according to other communication protocols is described. May be relayed.

1 Relay device 2 In-car communication line 3 External device 4 ECU
DESCRIPTION OF SYMBOLS 5 In-vehicle connector 11 Control part 12 Reception part 13 Communication line 14 Switch 15 1st connector 16 2nd connector 17 Changeover switch C Vehicle

Claims (6)

A relay device that is connected to an in-vehicle communication line and an external device and relays data output to the in-vehicle communication line to the external device,
A communication line connecting the in-vehicle communication line and an external device;
A switch that is interposed in the communication line, and electrically connects the in-vehicle communication line and the external device ;
A receiving unit for receiving data output to the in-vehicle communication line;
And a control unit that turns on the switch when the receiving unit starts receiving data. Prior Symbol controller, the reception unit after starting the reception of the data, according to claim 1 that is so as to turn on the switch over a period corresponding to the specified data size from the data being received Relay device. A relay device that is connected to an in-vehicle communication line and an external device and relays data output to the in-vehicle communication line to the external device,
A communication line connecting the in-vehicle communication line and an external device;
A switch interposed in the communication line;
A receiving unit for receiving data output to the in-vehicle communication line;
A control unit that turns on the switch for a period according to the data size specified from the data being received when the receiving unit starts receiving data;
A relay device comprising: The receiving unit is configured to receive each of data output at a plurality of transmission speeds,
The relay apparatus according to any one of claims 1 to 3 , further comprising a transmission rate receiving unit that receives a selection operation of one transmission rate received by the receiving unit from the plurality of transmission rates. The relay device according to any one of claims 1 to 4 , wherein the relay device is configured to be detachable from the in-vehicle communication line and the external device. Mounted on the vehicle,
The communication line is connected to one end of a connector for external connection, and the in-vehicle communication line is connected to the other end.
A switch operation receiving unit for receiving an operation related to on / off of the switch;
The relay device according to any one of claims 1 to 4 , wherein the control unit controls on / off of the switch according to an operation received by the switch operation receiving unit.

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