JP2013129291A - Vehicle communication control device, and method and program for controlling vehicle communication network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle communication control device which can smoothly perform communication control when a specific external device is connected to a communication network.SOLUTION: The vehicle communication control device mounted to a vehicle includes: a plurality of on-vehicle device control devices which control on-vehicle devices; the communication network to which the plurality of on-vehicle device control devices are connected; and a connection means to which the external device can be connected and which makes the connected external device to be connected to the communication network, wherein at a specific external device connection when the specific external device is connected to the connection means, the plurality of on-vehicle device control devices suppress communication between the vehicle mounted device control devices via the communication network and stops communication disconnection determination processing in the communication network.

Description

  The present invention relates to a vehicle communication control device that performs control related to a communication network to which a plurality of vehicle-mounted device control devices that control vehicle-mounted devices are connected, and a control method and program for a vehicle communication network.

  Conventionally, a plurality of in-vehicle device control devices (hereinafter referred to as an ECU (Electronic Control Unit)) for controlling in-vehicle devices are mounted on an automobile, and transmission / reception of signals related to the vehicle state is mounted on the vehicle between the ECUs. Is done via a communication network.

  By the way, when the automobile receives a diagnosis of each function at a maintenance shop or the like, an external diagnosis tool (diagnostic tool) is connected to the communication network. Then, the external diagnostic tool transmits a request signal so as to transmit, for example, data related to the state of the engine to an engine ECU that controls the engine. The engine ECU transmits response data having contents corresponding to the request signal to the external diagnostic tool.

  In such communication between the external diagnostic tool and the ECU, the response characteristics of the ECU with respect to the request, such as the time from when the ECU receives the request until transmission of response data starts, are defined by laws and regulations (for example, ISO 15031, ISO 15765). ing.

  Patent Document 1 discloses a vehicle control device that controls equipment mounted on a vehicle and transmits response data in response to a reception request when receiving a request from another device connected via a communication line. The determination means for determining whether or not the reception request is a specific request, and based on the determination result of the determination means, when the reception request is a specific request rather than when the reception request is not a specific request, It describes a vehicle control device that changes the execution conditions of a transmission process for transmitting response data so that the responsiveness to a reception request is increased. Examples of changing the execution condition of the transmission process include intermittent transmission of response data in a plurality of frames, cancellation of transmission of response data for a reception request that is not a specific request, and the like.

JP-A-2005-47488

  However, in the apparatus described in Patent Document 1, there is a case where each ECU cannot receive the response data (or the reception is delayed) by changing the execution condition of the transmission process. Inconvenience may occur.

  According to one aspect of the present invention, an object of the present invention is to provide a vehicle communication control device and the like that can more smoothly perform communication control when a specific external device is connected to a communication network. To do.

In order to achieve the above object, the first aspect of the present invention provides:
A vehicle communication control device mounted on a vehicle,
A plurality of in-vehicle device control devices for controlling the in-vehicle devices;
A communication network to which the plurality of in-vehicle device control devices are connected;
An external device is connectable, and connecting means for connecting the connected external device to the communication network, and
When the specific external device is connected to the connection means and the specific external device is connected, the plurality of in-vehicle device control devices suppress communication between the in-vehicle device control devices via the communication network, and communication in the communication network The interruption determination process is stopped,
It is a communication control apparatus for vehicles.

  According to the first aspect of the present invention, when a specific external device is connected to the connection means, the plurality of in-vehicle device control devices communicate with each other through the communication network. In addition to the suppression, the communication interruption determination process in the communication network is stopped, so that the communication control when a specific external device is connected to the communication network can be performed more smoothly.

In the first aspect of the present invention,
When it is detected that the specific external device is connected to the connection means, communication between the in-vehicle device control devices via the communication network is suppressed for the plurality of in-vehicle device control devices, and the communication network It is good also as what is provided with the instruction | indication means which instruct | indicates to stop the communication interruption determination process in.

In the first aspect of the present invention,
When detecting that the specific external device is connected to the connection means, a connection detection that transmits a connection detection signal indicating that the specific external device is connected to the connection means to the plurality of in-vehicle device control devices. Comprising signal transmission means,
The plurality of in-vehicle device control devices, when receiving the connection detection signal, suppress communication between the in-vehicle device control devices via the communication network and stop communication interruption determination processing in the communication network. It is good also as what to do.

In the first aspect of the present invention,
The specific external device is, for example, an external diagnostic tool that collects vehicle information for performing failure diagnosis of the in-vehicle device.

In the first aspect of the present invention,
The plurality of in-vehicle device control devices hold in the storage means a communication mode change table that defines the communication mode change contents when suppressing communication between the in-vehicle device control devices via the communication network, The communication between the in-vehicle device control devices may be suppressed according to the communication mode change table.

In the first aspect of the present invention,
The plurality of in-vehicle device control devices have a predetermined stop indicating that the connection of the specific external device is completed or the vehicle is safely stopped after the specific external device is connected to the connection means. Until it deviates from the state, the communication between the vehicle-mounted device control devices via the communication network is suppressed, and the communication interruption determination process in the communication network is maintained in a stopped state. Good.

The second aspect of the present invention is:
A vehicle comprising: a communication network to which a plurality of in-vehicle device control devices that control in-vehicle devices are connected; and a connection unit that can be connected to an external device and connects the connected external device to the communication network. A communication network control method comprising:
A computer connected to the communication network
Processing for detecting whether or not a specific external device is connected to the connection means;
When a specific external device is connected to the connection means, communication between the in-vehicle device control devices via the communication network is suppressed for the plurality of in-vehicle device control devices, and communication interruption determination processing in the communication network is performed. Processing to instruct to stop,
Is a control method for a vehicle communication network.

  According to this second aspect of the present invention, when a specific external device is connected to the connection means, the plurality of in-vehicle device control devices suppress communication between the in-vehicle device control devices via the communication network. Since the communication interruption determination process in the communication network is instructed to stop, communication control when a specific external device is connected to the communication network can be performed more smoothly.

The third aspect of the present invention is:
A vehicle comprising: a communication network to which a plurality of in-vehicle device control devices that control in-vehicle devices are connected; and a connection unit that can be connected to an external device and connects the connected external device to the communication network. A communication network control program,
A computer connected to the communication network;
Processing for detecting whether or not a specific external device is connected to the connection means;
When a specific external device is connected to the connection means, communication between the in-vehicle device control devices via the communication network is suppressed for the plurality of in-vehicle device control devices, and communication interruption determination processing in the communication network is performed. Processing to instruct to stop,
Is a control program for a vehicle communication network.

  According to the third aspect of the present invention, when a specific external device is connected to the connection means, the plurality of in-vehicle device control devices suppress communication between the in-vehicle device control devices via the communication network. Since the communication interruption determination process in the communication network is instructed to stop, communication control when a specific external device is connected to the communication network can be performed more smoothly.

  According to an aspect of the present invention, it is possible to provide a vehicle communication control device and the like that can more smoothly perform communication control when a specific external device is connected to a communication network.

1 is a system configuration example of a vehicle communication control device 1 according to an embodiment of the present invention. It is a flowchart which shows the flow of the process performed by the relay apparatus 30 which concerns on a present Example. It is an example of the change table of the communication mode hold | maintained by ECU10 # 1, 10 # 2 of a present Example.

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

  Hereinafter, a vehicle communication control apparatus, a vehicle communication network control method, and a program according to an embodiment of the present invention will be described with reference to the drawings.

[Constitution]
FIG. 1 is a system configuration example of a vehicle communication control apparatus 1 according to an embodiment of the present invention. The vehicle communication control device 1 includes ECUs 10 # 1 and 10 # 2, a bus 20, a relay device 30, and a connector 40 as main components.

  The ECUs 10 # 1 and 10 # 2 are, for example, microcomputers in which memory devices 32 such as a ROM (Read Only Memory) and a RAM (Random Access Memory) are connected to each other via a bus with a central processing unit (CPU) as a center. In addition, a bus controller, an auxiliary storage device, an I / O port, a timer, a counter, and the like for controlling communication in the communication network via the bus 20 are provided. The auxiliary storage device stores programs and data executed by the CPU. The ECUs 10 # 1 and 10 # 2 are, for example, travel control system ECUs that control an engine or the like. In communication via the bus 20, a communication protocol such as CAN (Controller Area Network) is employed.

  The bus 20 adopts other communication protocols such as a body communication protocol represented by LIN (Local Interconnect Network), a multimedia communication protocol represented by MOST (Media Oriented Systems Transport), FlexRay, and the like. A gateway computer that relays connection with another ECU group that is performing communication may be attached as necessary.

  In the communication network via the bus 20, information is transmitted and received in such a manner that each ECU transmits response data when receiving a request from another ECU. Main data transmitted and received through this communication network includes vehicle speed, acceleration, engine speed, shift position, steering angle, yaw rate, navigation information, and others. Each ECU connected to the bus 20 controls the in-vehicle device using the data acquired via the bus 20 and the data acquired from the dedicated device connected thereto. The communication network is not limited to a wired communication network using a bus or a serial communication line, and a part or all of the communication network may be replaced with a wireless communication network.

  The relay device 30 is a computer having the same configuration as the ECUs 10 # 1 and 10 # 2, for example, detects that the external diagnostic tool 100 is connected to the connector 40, and performs communication control in the communication network via the bus 20. Do. The content of the processing in the communication control is realized by the computer that is the relay device 30 executing the program stored in the auxiliary storage device, the ROM, or the like.

  The connector 40 is detachably attached to the tool-side connector 120 attached to the distal end portion of the cable 110 extending from the external diagnostic tool 100. There are various connector mounting modes, and any mode may be used.

  Communication between the external diagnostic tool 100 and the relay device 30 may be performed by a communication protocol different from the communication protocol in the vehicle. In this case, the relay device 30 also functions as a gateway computer that relays the communication protocol employed by the external diagnostic tool 100 and the communication protocol on the bus 20.

  The external diagnostic tool 100 acquires a real-time state of the in-vehicle device controlled by the ECUs 10 # 1 and 10 # 2, or acquires data held as diagnostic information by the ECUs 10 # 1 and 10 # 2. Then, it is diagnosed whether an abnormality has occurred in the vehicle on which the vehicle communication control device 1 is mounted. When such data is acquired, various data request signals are transmitted from the external diagnostic tool 100 to the ECUs 10 # 1 and 10 # 2, and the requested data is transmitted to the external diagnostic tool 100 by the ECUs 10 # 1 and 10 # 2. The process of performing is executed.

[Processing flow]
Hereinafter, the flow of processing executed by the relay device 30 will be described. FIG. 2 is a flowchart illustrating the flow of processing executed by the relay device 30 according to the present embodiment. This flow is repeatedly executed at a predetermined cycle, for example.

  First, the relay device 30 waits until it detects that the external diagnostic tool 100 is connected to the communication network via the bus 20 (S200). The connection of the external diagnostic tool 100 to the communication network via the bus 20 can be detected by inputting a predetermined start signal from the external diagnostic tool 100, for example. When the connector 40 is a connector dedicated to the connection of the external diagnostic tool 100, the connector 40 includes a sensor for detecting attachment / detachment, and the external diagnostic tool 100 is attached when the tool-side connector 120 is attached to the connector 40. You may detect that it is connected.

  When external diagnostic tool 100 is connected to the communication network via bus 20, relay device 30 transmits a communication data suppression request signal to ECU 10 # 1, 10 # 2 via bus 20 (S202). .

  Receiving the communication data suppression request signal, the ECUs 10 # 1 and 10 # 2 suppress communication between the ECUs except for communication with the external diagnostic tool 100 in a unique manner. For example, the ECUs 10 # 1 and 10 # 2 hold the communication mode change table in the normal state and the communication data suppression state by receiving the communication data suppression request signal in an internal storage device (ROM, EEPROM, etc.). In accordance with this communication mode change table, communication between the ECUs excluding communication with the external diagnostic tool 100 is suppressed.

  FIG. 3 is an example of a communication mode change table held by the ECUs 10 # 1 and 10 # 2 of the present embodiment. As shown in the figure, the ECUs 10 # 1 and 10 # 2 switch the transmission data that was periodically transmitted in the normal state at a cycle of 100 [ms] to event transmission and request / response transmission, or at a longer cycle. The communication mode is switched so as to transmit periodically. In addition, transmission of relatively less important data that was regularly transmitted in a long cycle may be stopped.

  As a result, the amount of data flowing through the bus 20 is temporarily reduced, and the communication load on the bus 20 is reduced. As a result, the external diagnostic tool 100 transmits various data request signals to the ECUs 10 # 1, 10 # 2, and the response speed when the ECUs 10 # 1, 10 # 2 transmit the requested data to the external diagnostic tool 100 is increased. Can be improved. The ECUs 10 # 1, 10 # 2 hold a communication mode change table in the communication data suppression state in the internal storage device, and the ECU excluding communication with the external diagnostic tool 100 according to the communication mode change table. In order to suppress communication between them, only the communication data suppression request signal is sufficient as the instruction signal flowing through the bus 20. As a result, the response speed when the external diagnosis tool 100 performs vehicle diagnosis can be further improved.

  Next, the relay device 30 transmits a communication interruption determination stop request signal to the ECUs 10 # 1 and 10 # 2 via the bus 20 (S204).

  The communication interruption determination stop request signal is a signal for requesting to stop the communication interruption determination executed by the ECUs 10 # 1 and 10 # 2 in the normal state.

  If the ECU 10 # 1, 10 # 2 does not receive data that has been received periodically, for example, at a period of 100 [ms] for 300 [ms] in the normal state, the ECU 10 # 1, 10 # 2 malfunctions in the communication network via the bus 20. It is determined that an error has occurred or an abnormality has occurred in the data transmission source, and error processing or the like is executed. However, if such error processing is executed when the external diagnostic tool 100 is connected, there is a possibility that the processing load on the ECUs 10 # 1, 10 # 2 itself increases and the response processing to the external diagnostic tool 100 is delayed. In addition, when the error processing includes data transmission to another ECU, the communication load on the bus 20 may increase and the data transmission to the external diagnostic tool 100 may be delayed. For this reason, in the vehicle communication control apparatus 1 of the present embodiment, the ECU 10 # 1, 10 # 2 is requested to stop the communication interruption determination until the return signal is transmitted after the communication data suppression request signal is transmitted. It is supposed to be. As a result, it is possible to suppress the occurrence of processing that hinders communication with the external diagnostic tool 100, and the communication control when the external diagnostic tool 100 is connected to the communication network via the bus 20 can be performed more smoothly. Can be done.

  Next, the relay device 30 determines whether or not the connection of the external diagnostic tool 100 is completed (206). The completion of the connection of the external diagnostic tool 100 can be detected by inputting a predetermined end signal from the external diagnostic tool 100, for example. Alternatively, the connector 40 may be provided with a sensor for detecting attachment / detachment, and it may be determined that the connection of the external diagnostic tool 100 is completed when the tool-side connector 120 is disconnected from the connector 40.

  When the connection of the external diagnostic tool 100 is terminated, the relay device 30 sends a return signal that instructs the ECUs 10 # 1 and 10 # 2 to return from the communication data suppression state and the communication interruption determination stop state. 20 (S210).

  As a result, the ECUs 10 # 1, 10 # 2 return from the communication data suppression state and the communication interruption determination stop state, and transition to the normal state. In the normal state, the communication interruption determination is performed as described above.

  On the other hand, when the connection of the external diagnostic tool 100 is not terminated, the relay device 30 determines whether or not the predetermined diagnostic state is deviated (S208). Here, the predetermined stop state refers to a state that satisfies various conditions indicating that the vehicle on which the vehicle communication control device 1 of the present embodiment is mounted is safely stopped. The external diagnostic tool 100 is connected to the communication network via the bus 20 in a scene where each function is diagnosed in a maintenance factory or the like, and not in a scene where the vehicle is traveling on the road. Therefore, the vehicle in the scene is (1) the engine speed is less than the predetermined speed, (2) the shift position is the parking position (P (parking)), (3) the vehicle speed is zero, etc. It is necessary to satisfy the conditions. The relay device 30 determines that the vehicle has deviated from the predetermined stop state when some of the various conditions are not satisfied.

  When the relay device 30 deviates from the predetermined stop state, the relay device 30 sends a return signal to the ECUs 10 # 1, 10 # 2 to instruct to return from the communication data suppression state and the communication interruption determination stop state via the bus 20. (S210).

  As a result, the ECUs 10 # 1, 10 # 2 can quickly transition to the normal state and perform error processing or the like for a state that does not match the scene where the external diagnostic tool 100 is connected.

  If the connection of the external diagnostic tool 100 is not completed and the predetermined stop state is maintained, the process returns to S206. Thus, until a positive determination is obtained in either determination of S206 or S208, ECU 10 # 1, 10 # 2 is maintained in the communication data suppression state and the communication interruption determination stop state.

  The ECU 10 # 1, 10 # 2 activates a timer when receiving a communication data suppression request signal and / or a communication interruption determination stop request signal, and compares the predetermined time (compared with the time required for vehicle diagnosis). When a sufficiently long time (several tens of minutes to several hours, etc.) has elapsed, the normal state may be restored without waiting for reception of the return signal. Thus, when an abnormality occurs in the communication network via the bus 20 during the vehicle diagnosis, the ECUs 10 # 1, 10 # 2 can quickly transition to the normal state and perform error processing and the like.

  According to the vehicle communication control device 1 of the present embodiment described as abnormal, when the external diagnostic tool 100 is connected to the communication network via the bus 20, the relay device 30 controls the communication data to the ECUs 10 # 1 and 10 # 2. Since the request signal is transmitted, the amount of data flowing through the bus 20 is temporarily reduced, and the communication load on the bus 20 is reduced. As a result, the response speed of the ECUs 10 # 1 and 10 # 2 with respect to the external diagnostic tool 100 can be improved.

  The ECUs 10 # 1, 10 # 2 hold a communication mode change table in the communication data suppression state in the internal storage device, and the ECU excluding communication with the external diagnostic tool 100 according to the communication mode change table. Therefore, the response speed when the external diagnostic tool 100 performs vehicle diagnosis can be further improved.

  Furthermore, when the external diagnostic tool 100 is connected to the communication network via the bus 20, the relay device 30 transmits a communication interruption determination stop request signal to the ECUs 10 # 1 and 10 # 2. Occurrence of processing that hinders communication can be suppressed, and communication control when the external diagnostic tool 100 is connected to the communication network via the bus 20 can be performed more smoothly.

  As a result, communication control when the external diagnostic tool 100 is connected to the communication network can be performed more smoothly.

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

  For example, when it is detected that the external diagnostic tool 100 is connected to the communication network via the bus 20, the relay device 30 may transmit only the connection detection signal to the ECUs 10 # 1 and 10 # 2. In this case, the ECUs 10 # 1 and 10 # 2 transition to a communication data suppression state and a communication interruption determination stop state by their software processing. As a result, the communication load on the bus 20 when the external diagnostic tool 100 is connected can be further reduced.

1 Vehicle Communication Control Device 10 # 1, 20 # 2 ECU
20 Bus 30 Relay device 40 Connector 100 External diagnostic tool 110 Cable 120 Tool side connector

Claims (8)

A vehicle communication control device mounted on a vehicle,
A plurality of in-vehicle device control devices for controlling the in-vehicle devices;
A communication network to which the plurality of in-vehicle device control devices are connected;
An external device is connectable, and connecting means for connecting the connected external device to the communication network, and
When the specific external device is connected to the connection means and the specific external device is connected, the plurality of in-vehicle device control devices suppress communication between the in-vehicle device control devices via the communication network, and communication in the communication network The interruption determination process is stopped,
Vehicle communication control device. The vehicle communication control device according to claim 1,
When it is detected that the specific external device is connected to the connection means, communication between the in-vehicle device control devices via the communication network is suppressed for the plurality of in-vehicle device control devices, and the communication network Characterized by comprising an instruction means for instructing to stop the communication interruption determination processing in
Vehicle communication control device. The vehicle communication control device according to claim 1,
When detecting that the specific external device is connected to the connection means, a connection detection that transmits a connection detection signal indicating that the specific external device is connected to the connection means to the plurality of in-vehicle device control devices. Comprising signal transmission means,
The plurality of in-vehicle device control devices, when receiving the connection detection signal, suppress communication between the in-vehicle device control devices via the communication network and stop communication interruption determination processing in the communication network. To
Vehicle communication control device. The vehicle communication control device according to any one of claims 1 to 3,
The specific external device is an external diagnostic tool that collects vehicle information for performing a fault diagnosis of the in-vehicle device.
Vehicle communication control device. The vehicle communication control device according to any one of claims 1 to 4,
The plurality of in-vehicle device control devices hold in the storage means a communication mode change table that defines the communication mode change contents when suppressing communication between the in-vehicle device control devices via the communication network, Suppressing communication between the in-vehicle device control devices according to a communication mode change table,
Vehicle communication control device. The vehicle communication control device according to any one of claims 1 to 5,
The plurality of in-vehicle device control devices have a predetermined stop indicating that the connection of the specific external device is completed or the vehicle is safely stopped after the specific external device is connected to the connection means. Until it deviates from the state, while suppressing communication between the in-vehicle device control device via the communication network, it is maintained in a state in which the communication interruption determination process in the communication network is stopped,
Vehicle communication control device. A vehicle comprising: a communication network to which a plurality of in-vehicle device control devices that control in-vehicle devices are connected; and a connection unit that can be connected to an external device and connects the connected external device to the communication network. A communication network control method comprising:
A computer connected to the communication network
Processing for detecting whether or not a specific external device is connected to the connection means;
When a specific external device is connected to the connection means, communication between the in-vehicle device control devices via the communication network is suppressed for the plurality of in-vehicle device control devices, and communication interruption determination processing in the communication network is performed. Processing to instruct to stop,
A control method for a vehicular communication network, characterized in that: A vehicle comprising: a communication network to which a plurality of in-vehicle device control devices that control in-vehicle devices are connected; and a connection unit that can be connected to an external device and connects the connected external device to the communication network. A communication network control program,
A computer connected to the communication network;
Processing for detecting whether or not a specific external device is connected to the connection means;
When a specific external device is connected to the connection means, communication between the in-vehicle device control devices via the communication network is suppressed for the plurality of in-vehicle device control devices, and communication interruption determination processing in the communication network is performed. Processing to instruct to stop,
A control program for a vehicle communication network, characterized in that

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