JP2009005160A - Error generation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an error generation device for creating the error condition of a network, which could not be created conventionally. <P>SOLUTION: The error generation device 1 of this embodiment is used by connecting the same to a communication network 100 equipped with a plurality of nodes 110 mounted on a vehicle and is equipped with a control unit 10, a memory unit 20, a communication controller 30, an external input output I/F 40 or the like. The communication controller 30 transmits an abnormal frame, different from a received data frame, to the communication network 100 when a data frame, corresponding to an evaluation objective frame registered in the memory unit 20, is received. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an error generating device connected to a communication network including a plurality of nodes.

  In vehicles such as automobiles, control of powertrain systems such as engines and transmissions, and body systems such as seats and mirrors are shared and processed by a plurality of electronic control units, and these multiple systems are communicated via communication lines. By connecting nodes such as electronic control devices and various sensors to form a network and exchanging control data and measurement data with each other, total controllability is improved.

  Each node in the above-described in-vehicle network generates an error within the node itself, or determines whether or not a data frame to be transmitted from another node on the network is actually received. Based on this, it has a function of diagnosing an error and storing the diagnosis result in the node.

  Conventionally, when performing a test to generate an error in an in-vehicle network and evaluate the behavior of each node, a diagnosis machine for analyzing a failure is connected to the network, and the diagnosis stored in the node by the diagnosis machine By reading the result, an operation of confirming whether the node correctly recognizes the generated error has been performed.

In addition, when confirming the diagnosis result stored in each node with an external device (diagnostic machine), each node specifies an external device, and responds appropriately to requests from a plurality of external devices. A technique has been proposed (see Patent Document 1).
JP 2006-23850 A

  In recent years, technology has been developed to electrically connect and control elements that have conventionally been mechanically connected, such as steering and brakes, via a network. By using such technology, you can enjoy the benefits of reducing the weight of the vehicle body by eliminating the need for components such as the steering column and oil pump, and improving the degree of freedom in design by reducing the restrictions on the steering arrangement. can do.

  Since components such as steering and brakes are directly linked to automobile accidents, high network robustness is required when the above-described technology is put into practical use. Therefore, it is necessary to create a variety of network error conditions than before, and to perform a test for evaluating the behavior of each component in such a state. However, conventionally, no attention has been paid to the creation of various error conditions in the network, and no technology for creating such conditions has been proposed.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an error generating device for creating an error state of a network that could not be created conventionally.

In order to solve the above-described problem, an invention according to claim 1 is an error generating device connected to a communication network including a plurality of nodes.
This error generating device has a function of transmitting and receiving a frame to and from a communication network. And it is configured to be set to either a normal transmission mode for transmitting the same frame as the received frame to the communication network or an abnormal transmission mode for transmitting an abnormal frame different from the received frame to the communication network. Has been.

  According to the error generating device configured as described above, since an abnormal frame that does not flow in a normal state of the communication network can be transmitted to a part or all of the communication network, it can be created conventionally. An error state of the communication network that could not be created can be created. Thereby, it becomes possible to perform an evaluation test of each node in an error state of a communication network that could not be created conventionally.

  In addition, since the frame flowing in the communication network can be received and transmitted as it is, the transmission / reception of the data frame is not hindered no matter where the error generating device is arranged in the communication network. Therefore, it is possible to create a state in which an abnormality has occurred only in a part of the communication network or in an arbitrary node, and it is possible to maintain the function of the communication network normally when no error frame is transmitted.

  The timing at which the above-described error generating device is set to the normal transmission mode or the abnormal transmission mode is not particularly limited. For example, a configuration may be adopted in which one of the above modes is set in accordance with an input from an external device such as a switch attached to the error generating device or a PC connected to the error generating device. Further, the error generating device measures the time, and the setting may be changed periodically at a certain time interval, or the setting may be changed at a predetermined time.

In order to set the mode at a timing other than that described above, the error generation device according to claim 1 may be configured as described in claim 2.
The error generating device according to claim 2 is configured to determine whether or not a received frame corresponds to a predetermined evaluation target frame, and is set to an abnormal transmission mode when it is determined to be applicable. ing.

  The error generating device configured as described above transmits an abnormal frame when a frame corresponding to the evaluation target frame is received from the communication network. Therefore, the communication network can be in an abnormal state when a predetermined frame flows through the communication network.

Further, the error generating device according to claim 2 described above may be configured as described in claim 3.
The error generating apparatus according to claim 3 is configured to be set to the normal transmission mode when it is determined that the received frame does not correspond to the above-described predetermined evaluation target frame.

  The error generating apparatus configured as described above is in a state of transmitting the received frame as it is when a frame other than the evaluation target frame is received from the communication network. Therefore, an abnormal frame can be transmitted when a frame corresponding to the evaluation target frame is received, and can be transmitted as it is when a normal frame is received. Therefore, it is possible to create an error state in which only a predetermined evaluation target frame flows as an abnormal frame and other frames normally flow in part or all of the communication network.

  Further, in the error generating device according to claim 2 or 3, the transmitted abnormal frame may be a predetermined type of frame, or from a plurality of predetermined abnormal frames. Any selected frame may be used.

  As in the latter case, in order to determine an abnormal frame to be transmitted, as described in claim 4, in the abnormal transmission mode, the received frame is determined corresponding to the corresponding evaluation target frame. It is conceivable to configure such that an abnormal frame is transmitted.

  With the error generating device configured as described above, a different frame can be transmitted according to the received frame. Thereby, since a plurality of different abnormal frames can be transmitted, it is possible to create a state in which a plurality of different errors occur simultaneously in the communication network.

  By the way, the specific configuration of the error frame described above is not particularly limited. For example, as described in claim 5, a frame whose frame data is 0 may be used as an abnormal frame. By using such an abnormal frame, a predetermined frame flowing in the communication network can create an error state in which data is 0 in part or all of the communication network.

  As an example different from the above, as described in claim 6, a frame corresponding to an abnormal frame to be transmitted (a frame currently received that triggers transmission of the abnormal frame) is excluded from frames already received. A frame selected based on a predetermined criterion may be used as an abnormal frame.

  The selection according to a predetermined criterion here refers to, for example, selecting a frame received before a predetermined time from frames that have already been received and stored, or selecting a frame received before a predetermined number of times. To do. By using such an abnormal frame, in a part or all of the communication network, only the predetermined frame is delayed to reach the target node, or only the predetermined frame is not in the order of transmission. An error condition to be reached can be created.

Embodiments of the present invention will be described below with reference to the drawings.
(1) Overall Configuration The error generating device 1 of the present embodiment is used by connecting to a communication network 100 mounted on a vehicle. The communication network 100 described above includes a plurality of nodes 110 (110A, 110B, 110C). The node 110 corresponds to an electronic control device or a sensor mounted on the vehicle. Each node 110 has a function of creating a data frame having information to be transmitted to other nodes 110 and data indicating an identification number (ID), and controls the vehicle by exchanging data frames with each other. Do.

As shown in FIG. 1, the error generating device 1 described above includes a control unit 10, a storage unit 20, a communication controller 30, an external input / output I / F 40, and the like.
The control unit 10 of the error generating device 1 controls the entire error generating device 1 according to a program stored in the storage unit 20.

  The storage unit 20 stores, as a storage area for storing data, an ID (hereinafter, referred to as an evaluation target frame) that indicates an identification number of a data frame to be evaluated (hereinafter referred to as an evaluation target frame) in addition to a storage area for a program that controls the control unit 10. A storage area for registering information indicating an abnormal frame determined in accordance with the evaluation target ID.

  The frame to be evaluated here is a data frame that triggers transmission of an abnormal frame different from the received data frame when frame transmission processing described later is started when the data frame is received.

  In the present embodiment, the data frame of ID50 and the data frame of ID200 are registered as evaluation target frames. In addition, a data frame whose frame data is 0 is registered as an abnormal frame corresponding to the data frame of ID50, and the data of ID200 stored in the reception buffer 34, which will be described later, as an abnormal frame corresponding to the data frame of ID200. A setting for using a data frame received five times before among frames is registered.

  Two communication controllers 30 (30A, 30B) are provided in the error generating device 1, and are connected to the communication lines 120 (120A, 120B) in the communication network 100 via connectors 32 (32A, 32B). Yes. The communication controller 30 has a function of receiving a data frame transmitted from the node 110 and a function of transmitting a data frame to the communication line 120.

  Each communication controller 30 also includes a reception buffer 34 (34A, 34B) that stores data frames received from the communication line 120, and a transmission buffer 36 (36A, 36B) that stores data frames transmitted to the communication line 120. have. The reception buffer 34 and the transmission buffer 36 are configured so as to be output and stored (in a so-called FIFO) in order from the previously stored one. The reception buffer 34 classifies received frames for each ID and stores data frames received a predetermined number of times.

The external input / output I / F 40 is an interface for connecting the external device 200 and the error generating device 1. The external device 200 is a device for updating the information in the storage unit 20 by changing the setting of the evaluation target frame stored in the storage unit 20 and the corresponding abnormal frame.
(2) Frame Transmission Processing by Control Unit 10 Hereinafter, frame transmission processing executed by the control unit 10 will be described. Here, a process when a data frame is received from the communication line 120A is illustrated. This frame transmission process is executed every time the communication controller 30A receives a data frame from the communication line 120A.

In this process, first, the received data frame is stored in the reception buffer 34A (step 1; hereinafter, step is referred to as S).
Next, it is determined whether or not the data frame stored in the reception buffer 34A in S1 corresponds to the evaluation target frame registered in the storage unit 20 (S2). Here, an ID (hereinafter referred to as a reception ID) included in the data frame stored in the reception buffer 34A in S1 and an evaluation target ID (ID50 and ID200 in the present embodiment) registered in the storage unit 20 are used. Compare.

  At this time, if the received ID matches the evaluation target ID (S2: YES), that is, if the reception ID is ID50 or ID200, an abnormal frame corresponding to the evaluation target ID set and registered in the storage unit 20 is determined. The data is stored in the transmission buffer 36B of the communication controller 30B (S3). Specifically, when the reception ID is ID50, a data frame in which all data is 0 is stored in the transmission buffer 36B. When the reception ID is ID200, the data frame having the output value of the data frame of ID200 received five times before stored in the reception buffer 34A is stored in the transmission buffer 36B.

On the other hand, if the reception ID does not match the evaluation target ID (S2: NO), the data frame stored in the reception buffer 34A in S1 is stored in the transmission buffer 36B (S4).
Next, the data frame stored in the transmission buffer 36B is transmitted to the communication line 120B (S5), and this process ends.
(3) Effect The error generating device 1 configured in this way is used when a predetermined data frame flows in the communication network 100 without basically hindering data communication between the nodes 110 in the communication network 100. Only in this case, an abnormal frame can be transmitted to the node 110C.

Therefore, it is possible to create a situation such as when an abnormality has occurred in the communication line 120B connected to the node 110C, or when only the reception function of the node 110C is abnormal.
In addition, since a plurality of abnormal frames can be transmitted, it is possible to create a state in which a plurality of different errors occur simultaneously in the communication network 100.
(4) Modifications The embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment, and can take various forms as long as they belong to the technical scope of the present invention. Needless to say.

  For example, in the above-described embodiment, a configuration in which a data frame is received from the communication line 120A and an abnormal frame corresponding to the received data frame is transmitted to the communication line 120B is illustrated. However, the same processing may be performed on the data frame received from the communication line 120B and transmitted to the communication line 120A.

  In that case, in the processing corresponding to S1, the data frame received from the communication line 120B is stored in the reception buffer 34B. In the processing of S3 and S4, the data frame is stored in the transmission buffer 36A. In this process, it may be transmitted to the communication line 120A.

  Moreover, in the said embodiment, although the structure which transmits an abnormal frame at the timing which received the predetermined evaluation object frame was illustrated, the timing which transmits an abnormal frame is not limited to the said structure. For example, an operation switch may be attached to the error generating device 1, and an abnormal frame may be transmitted at a timing according to an input from the operation switch or a timing according to an input from the external device 200 described above. As another timing, the error generating device 1 measures the time, and transmits an abnormal frame at a constant time interval, or transmits an abnormal frame when a predetermined time comes. It is good.

  In the above-described embodiment, the configuration in which the evaluation target frame is a data frame is exemplified. However, the configuration is not particularly limited as long as it is a frame transmitted from the node 110 to the communication network 100. For example, an error frame transmitted when the node 110 detects an error may be set as an evaluation target frame.

  Moreover, in the said embodiment, although the data frame which made all the data 0 as an abnormal frame, and the data frame of the same ID as an evaluation object frame among the data frames memorize | stored in the receiving buffer 34 were illustrated, The configuration of the abnormal frame is not limited to that described above. For example, a newly created data frame may be an abnormal frame, or a data frame stored in the reception buffer 34 may be randomly selected and used as an abnormal frame.

  In the above-described embodiment, the configuration in which the error generating device 1 is connected at a position that separates the node 110C from the other nodes in the communication network 100 is illustrated. It is not limited. For example, as shown in FIG. 3A, a plurality of nodes 110 may be arranged so as to be separated, or as shown in FIG. 3B, it may be connected to one end of the communication network 100. Since the transmission destination of the abnormal frame can be changed by changing the arrangement in this way, various error states of the communication network 100 can be created.

The block diagram which shows the error generating apparatus of this invention The flowchart which shows the process sequence of the process by a control part. The figure which shows the connection mode of the error generating device

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Error generating apparatus, 10 ... Control part, 20 ... Memory | storage part, 30, 30A, 30B ... Communication controller, 32 ... Connector, 34, 34A, 34B ... Reception buffer, 36, 36A, 36B ... Transmission buffer, 100 ... Communication Network, 110, 110A, 110B, 110C ... node, 120, 120A, 120B ... communication line, 200 ... external device

Claims (6)

An error generating device connected to a communication network including a plurality of nodes,
Receiving means for receiving a frame from the communication network;
Transmitting means for transmitting a frame to the communication network;
One of a normal transmission mode in which the same frame as the frame received by the receiving unit is transmitted to the communication network, and an abnormal transmission mode in which an abnormal frame different from the frame received by the receiving unit is transmitted to the communication network. An error generating device comprising: setting means for setting a mode of the transmission means. Determining means for determining whether or not the frame received by the receiving means corresponds to a predetermined evaluation target frame;
The setting unit sets the transmission unit to the abnormal transmission mode when the determination unit determines that the frame received by the reception unit corresponds to the evaluation target frame. The error generator described. The setting unit sets the transmission unit to the normal transmission mode when the determination unit determines that the frame received by the reception unit does not correspond to the evaluation target frame. The error generating device described in 1. The transmission unit transmits a predetermined abnormal frame corresponding to the evaluation target frame to the communication network when the transmission unit is in the abnormal transmission mode. The error generator described. The error generation device according to any one of claims 1 to 4, wherein the abnormal frame is a frame whose frame data is 0. The abnormal frame is selected based on a predetermined criterion from frames other than the frame corresponding to the abnormal frame among the frames received by the receiving unit. The error generating device according to claim 4.

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