JP2014078865A - On-vehicle network diagnosis device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a communication load on a repeater by reducing the number of reception slots for diagnosis of the repeater in an on-vehicle network diagnosis device and to improve design freedom of designing an on-vehicle network.SOLUTION: A repeater (5) comprises the same number of reception slots for diagnosis (5A) as the number of connected communication buses, sets an acceptance filter per node (4C-4E), receives specific information transmitted by a node able to receive the set acceptance filter, switches the acceptance filter at preset timing so as to be able to receive specific information transmitted by different nodes (4C-4E), receives the specific information transmitted by all the nodes (4C-4E) connected with one communication bus (3) by the switching of the acceptance filter, and after completion of reception, transmits the specific information transmitted by all the nodes (4C-4E) to a diagnosis device (6).

Description

  The present invention relates to an in-vehicle network diagnostic apparatus, and more particularly to an in-vehicle network diagnostic apparatus that diagnoses connection / disconnection of a node connected to a communication bus.

The vehicle is provided with an in-vehicle network diagnostic device for diagnosing connection / disconnection of a node (ECU or the like) connected to a communication bus (transmission path).
This in-vehicle network diagnostic device includes a plurality of communication buses (CAN buses) to which one or more nodes are respectively connected, a relay device to which at least one of the plurality of communication buses is connected, and a plurality of communication buses. It is connectable to one and diagnoses the state of the node.
In addition, for detecting the node connection of the communication bus (CAN bus), a relay device (GW ECU: Gateway Electric Control 1 Unit), which is a specific node, receives communication data from all nodes on the communication bus, and the node connection detection result Are collectively transferred as communication data, thereby suppressing an increase in the load on the communication bus.
As such an in-vehicle network diagnostic apparatus, there are the following prior art documents.

JP 2010-93676 A

  A gateway device, a vehicle network, and a one-side disconnection detection method according to Patent Document 1 include a time interval measuring unit that measures a transmission time interval of communication data for each electronic control unit (node) connected to a communication bus, and electronic control. The communication failure determination means for storing the communication failure of the unit in the memory and the sum of the transmission time intervals of the plurality of electronic control units are monitored, and when the one-side disconnection determination value is exceeded, information indicating that one of the branch lines is disconnected is stored in the memory. One-side disconnection detecting means for storing the electronic control unit, and detecting that only one of the pair of branch lines connecting the electronic control unit to the communication bus (CAN bus) is disconnected.

  However, conventionally, in the in-vehicle network diagnostic device, the diagnostic reception slot of the communication bus (CAN bus) of the relay device (GW ECU) which is a specific node has the number of nodes on the communication bus (CAN bus). There was a problem that only minutes were needed.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an in-vehicle network diagnostic device that can reduce the number of diagnostic reception slots on a communication bus of a relay device while realizing node connection detection on a communication bus.

  The present invention is connectable to a plurality of communication buses each having one or more nodes connected thereto, a relay device to which at least one of the plurality of communication buses is connected, and one of the plurality of communication buses. In the in-vehicle network diagnostic apparatus including the diagnostic apparatus for diagnosing the state of the node, the relay apparatus includes the same number of diagnostic reception slots as the number of the connected communication buses, and the acceptance for each node. Set a filter, receive unique information transmitted by a node capable of receiving the set acceptance filter, and switch the acceptance filter so that unique information transmitted by a different node can be received at a preset timing, By switching the acceptance filter, all nodes connected to one of the plurality of communication buses are issued. After finishing receiving the unique information, and transmits the unique information to all of said nodes transmits to the diagnostic device.

  The present invention can reduce the number of reception slots for diagnosis of the communication bus of the relay device while realizing node connection detection on the communication bus.

FIG. 1 is a main flowchart of in-vehicle network diagnosis. (Example) FIG. 2 is a sub-flowchart of in-vehicle network diagnosis. (Example) FIG. 3 is a system configuration diagram of the in-vehicle network diagnostic apparatus. (Example)

  The present invention realizes the purpose of reducing the number of reception slots for diagnosis of the communication bus of the relay device by realizing node connection detection on the communication bus by dynamically switching the acceptance filter in the relay device. It is.

1 to 3 show an embodiment of the present invention.
As shown in FIG. 3, the vehicle-mounted network diagnostic device 1 is mounted on the vehicle.
This in-vehicle network diagnostic apparatus 1 includes a first communication bus 2 and a second communication bus 3 as a plurality of communication buses (transmission paths). The first communication bus 2 and the second communication bus 3 include a CAN (Controller Area Network) bus.
First and second nodes 4A and 4B are connected to the first communication bus 2 as one or more nodes. The second communication bus 3 is connected to third to fifth nodes 4C to 4E as one or more nodes. These 1st-5th nodes 4A-4E consist of communication apparatuses, such as a control apparatus (ECU).
A relay device (GW ECU) 5 is connected to the second communication bus 3. Further, a diagnostic device (diagnostic tool) 6 for diagnosing the state of the first to fifth nodes 4 </ b> A to 4 </ b> E is connected to the relay device 5 via the third communication bus 7.
The relay device 5 serves as a gateway (GW) for signals, and is a device that relays between the third to fifth nodes 4C to 4E connected to the second communication bus 3 and the diagnostic device 6.
In the middle of the third communication bus 7, the first communication bus 2 is connected.
In addition, an ignition (IG) switch 8 is connected to the relay device 5.

The relay device 5 includes one diagnostic reception slot 5A, which is the same number as the second communication bus 3, as a connected communication bus in the reception slot 5B. The diagnostic reception slot 5A is used for connection node determination.
The relay device 5 can set an acceptance filter for each of the third to fifth nodes 4C to 4E, and can receive unique information transmitted by the receivable third to fifth nodes 4C to 4E to which the acceptance filter is set. is there.
Then, the relay device 5 switches the acceptance filter so that it can receive unique information transmitted by different third to fifth nodes 4C to 4E at a preset timing, and as shown in FIG. After receiving the unique information (ID: C, ID: D, ID: E) transmitted by all the third to fifth nodes 4C to 4E connected to one second communication bus 3 by switching the filter The unique information (ID: F) transmitted from all the third to fifth nodes 4C to 4E is transmitted to the diagnostic device 6. That is, the relay device 5 collects communication data reception determination results from the third to fifth nodes 4C to 4E into one ID (communication data identifier) (ID: F), and transmits the result to the diagnosis device 6. . The communication data from the relay device 5 is a check completion flag and an all ID reception (determination for connection detection of each node) flag. Both the check completion flag and the all ID reception flag are a True signal or a False signal.

  That is, in this embodiment, the connection status (disconnection status) of the third to fifth nodes 4C to 4E is detected on the second communication bus 3 different from the diagnostic device 6, and the relay device 5 is connected to the third to third nodes. The communication data for node connection transmitted from the fifth nodes 4C to 4E is changed in the reception target ID (communication data identifier) by switching the acceptance filter at the completion of reception or every specified time (fixed time). Thus, the connection state (disconnection state) of all the third to fifth nodes 4C to 4E on the second communication bus 3 is detected by only one diagnostic reception slot 5A. .

Next, the in-vehicle network diagnosis will be described with reference to the main flowchart of FIG. 1 and the sub-flowchart of FIG.
As shown in the main flowchart of FIG. 1, when the ignition switch 8 is turned on (step A01), both the check completion flag and the all ID reception flag are set to False (check completion flag = False, all ID reception flag = False) (step A02).
Then, process A is performed on each reception target ID (step A03). The process A in step A03 will be described in detail with reference to the sub-flowchart of FIG.
Thereafter, when the execution of the process A for all target IDs is completed for one round (step A04), the check completion flag is set to True (check completion flag = True) (step A05). Even when the process A is looped after the check is completed, the check completion flag is set to True (check completion flag = True) (step A05).
After the process of step A05, the process returns to step A03.

Process A of step A03 will be described with reference to the sub-flowchart of FIG.
As shown in the sub-flowchart of FIG. 2, after step A02 of FIG. 1, the acceptance filter of the diagnostic reception slot 5A is set to ID: XXX (step B01).
Then, it is determined whether or not the ID: XXX has been received within a specified time (fixed time) (step B02).
If this step B02 is YES and reception is completed, the ID: XXX reception flag is set to True (ID: XXX reception flag = True) (step B03).
On the other hand, if this step B02 is NO and reception has not been completed, the ID: XXX reception flag is set to False (ID: XXX reception flag = False) (step B04).
After the process of Step B03 or after the process of Step B04, the process proceeds to Step A04 in FIG.

As a result, in this embodiment, the relay device 5 receives the all ID reception flag as communication data, recognizes the connected node, and connects using the check completion flag if necessary. Recognize that node check is incomplete / completed.
As a result, the acceptance filter is dynamically switched, and node connection detection communication data is received by only one diagnostic reception slot 5A, so that all the third to third channels on the second communication bus (CAN bus) 3 are received. With the detection of the connection (disconnection) of the five nodes 4C to 4E being realized, the receiving slot 5B can be largely allocated for receiving the control communication data, and the second can be achieved without hindering the degree of freedom in network design. It becomes possible to detect connection (disconnection) of all the third to fifth nodes 4C to 4E on the communication bus (CAN bus) 3.
Therefore, the number of diagnostic reception slots of the relay device 5 can be reduced, and the communication load of the relay device 5 can be reduced. It is also possible to improve the degree of design freedom in designing the in-vehicle network.
In this embodiment, the diagnostic device 6 also detects the connection (disconnection) of the first and second nodes 4A and 4B connected to the first communication bus 2.

  The in-vehicle network diagnostic apparatus according to the present invention can be applied to various vehicles.

1 in-vehicle network diagnostic device 2 first communication bus (CAN bus)
3 Second communication bus (CAN bus)
4A to 4E First to fifth nodes 5 Relay device (GW ECU)
5A Reception slot for diagnosis 5B Slot for reception 6 Diagnostic device (diagnostic tool)
7 Third communication bus 8 Ignition switch

Claims (1)

  A plurality of communication buses to which one or more nodes are respectively connected; a relay device to which at least one of the plurality of communication buses is connected; and one of the plurality of communication buses, wherein the connection is possible. In the in-vehicle network diagnostic device comprising a diagnostic device for diagnosing the state of a node, the relay device has the same number of diagnostic reception slots as the number of connected communication buses, and sets an acceptance filter for each node. Receiving the specific information transmitted by a node capable of receiving the set acceptance filter, and switching the acceptance filter so that the specific information transmitted by a different node can be received at a preset timing, By switching, the unique information transmitted by all the nodes connected to one of the plurality of communication buses is transmitted. After finishing receiving the in-vehicle network diagnostic apparatus and transmits the unique information to all of said nodes transmits to the diagnostic device.

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