JP5987761B2 - Diagnostic system, diagnostic device and ECU constituting the diagnostic system - Google Patents

Description

  The present invention relates to a technique for transmitting data to an ECU connected by a network standard such as CAN (Controller Area Network).

  A plurality of ECUs are mounted in the vehicle. The ECUs are connected by a network standard such as CAN, and transmit and receive data. For example, in CAN, 8-byte data is transmitted as one frame on the bus line.

  At this time, a diagnosis device is connected to the bus line to diagnose failure of each ECU. In particular, ISO 15765 is issued by ISO (International Organization for Standardization) regarding diagnosis, and the second part of the standard of ISO 15765-2 provides a detailed explanation regarding the transmission protocol. For this reason, various proposals based on this standard have been made (see, for example, Patent Document 1).

Japanese Patent No. 4448029

  By the way, when the data length of the data to be transmitted fits in one frame of CAN, individual data transmission from the diagnostic device to each ECU (hereinafter referred to as “unicast communication”) is also performed by data transmission to all ECUs (hereinafter “ Broadcast communication ”is also defined in ISO 15765-2. On the other hand, when the data length of the data to be transmitted does not fit in one frame of CAN, the data is segmented and transmitted in a plurality of frames. Although unicast communication is specified, ISO 15765 is related to broadcast communication. There is no provision in 2.

Therefore, conventionally, when segmented data is transmitted to all ECUs, it is realized by unicast communication.
However, since data is sequentially transmitted to each ECU, the communication time is increased. Therefore, for example, when a plurality of vehicles are sequentially diagnosed in a vehicle factory, the time required for the diagnosis has been increased. In addition, since data is transmitted to each ECU in order, the reception completion time at each ECU is different, and the data cannot be delivered at the same time.

  The present invention has been made to solve the above-described problems, and its purpose is to reduce the communication time even when segmented data is transmitted to all ECUs, and at the same time. An object of the present invention is to provide a diagnostic system capable of completing data transmission / reception.

  The diagnostic system (1) of the present invention made to achieve the above-mentioned object connects segmented data from the diagnostic device (10) to the diagnostic device via the bus line (40) by broadcast communication. It transmits to a plurality of ECUs (21, 22, 23).

Here, in particular, in the diagnostic apparatus, the start information transmitting means (10a) transmits start information (FF) indicating the start of data transmission.
When the start information transmitted by the start information transmitting unit is received, the control information transmitting unit (21a) of the ECU transmits the flow control information (FC). The flow control information includes information (FS) indicating whether reception is possible, information (BS) indicating the number of continuously receivable data, and information (STmin) indicating a receivable interval in continuous reception. That's it.

  In the diagnostic apparatus, the data transmission means (10b) can receive the data in all of the plurality of ECUs by adopting the lowest value of the information included in the flow control information based on the flow control information transmitted from the ECU. The data is repeatedly transmitted in a manner. Each ECU may transmit flow control information, or a specific ECU may transmit flow control information.

On the other hand, in the ECU, the data receiving means (21b) receives the data transmitted by the data transmitting means.
That is, since flow control information is transmitted from the ECU, data is transmitted to all of the plurality of ECUs at the same time by adopting the lowest values of various information included in the flow control information. In this way, communication time can be reduced even when segmented data is transmitted to all ECUs. Moreover, data transmission / reception can be completed at the same time.

  In addition, since this invention has the characteristics in the diagnostic apparatus (10) and ECU (21-23) which comprise a diagnostic system, you may implement | achieve as an invention of a diagnostic apparatus or ECU.

It is a block diagram which shows schematic structure of a diagnostic system. It is explanatory drawing which shows the subject at the time of transmitting segmented data. It is explanatory drawing which shows the content of FC. It is explanatory drawing which shows employ | adopting the minimum value of FS, BS, and STmin. It is explanatory drawing which shows the first half part of the transmission process of 1st Embodiment. It is explanatory drawing which shows the latter half part of the transmission process of 1st Embodiment. It is explanatory drawing which shows the first half part of the reception process of 1st Embodiment. It is explanatory drawing which shows the latter half part of the reception process of 1st Embodiment. It is explanatory drawing which shows the first half part of the transmission process of 2nd Embodiment. It is explanatory drawing which shows the latter half part of the transmission process of 2nd Embodiment. (A) is explanatory drawing which shows the specific ECU receiving process of 2nd Embodiment, (b) is explanatory drawing which shows the receiving process of 2nd Embodiment. It is explanatory drawing which shows the subject of the communication by unicast communication.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
As shown in FIG. 1, the diagnostic system 1 of this embodiment includes a diagnostic device 10, a plurality of ECUs 21, 22, 23, a gateway ECU 30, and a bus line 40 that connects the ECUs 21 to 23.

  The diagnostic device 10 is configured as a so-called computer connected to the outside of the vehicle, and includes a CPU, a ROM, a RAM, an I / O, and a bus line connecting them. Data communication with an external center 90 is possible, and necessary information is uploaded to the center 90 or downloaded from the center 90. Remote control from the center 90 is also possible. The diagnostic device 10 functions as a start information transmission unit 10a and a data transmission unit 10b. Moreover, the diagnostic apparatus 10 may be connected inside the vehicle. For example, it becomes a part of a navigation ECU or the like. Furthermore, the gateway ECU 30 and the diagnostic device 10 may be connected by a communication protocol (Ethernet (registered trademark) or the like) other than CAN, and the gateway ECU 30 may function as the start information transmission unit 10a and the data transmission unit 10b. Therefore, in this case, the gateway ECU 30 corresponds to a “diagnostic device” in the claims.

  The ECUs 21 to 23 are mounted on the vehicle and are embodied as, for example, an engine ECU, a navigation ECU, a brake ECU, or the like. In the present embodiment, the three ECUs 21 to 23 are provided in order not to make the description complicated, but more ECUs are generally provided. In the following, when distinguishing the ECUs 21 to 23, they are described as A-ECU21, B-ECU22, and C-ECU23 using symbols in FIG. The A-ECU 21 functions as a control information transmission unit 21a and a data reception unit 21b. The B and C ECUs 22 and 23 have the same means.

The gateway ECU 30 is a configuration for connecting the diagnostic device 10 outside the vehicle, and performs protocol conversion.
The bus line 40 connects the ECUs 21 to 23 of A to C, and data on the bus line 40 is transmitted according to the CAN network standard.

  With such a configuration, it is possible to transmit data as a diagnosis request from the diagnostic device 10 to each of the ECUs 21 to 23, and to perform diagnosis based on the data transmitted from each of the ECUs 21 to 23.

Next, in order to facilitate understanding of the present embodiment, the conventional problems will be described here again.
When the data length of data to be transmitted fits in one frame of CAN, both unicast communication and broadcast communication are defined in ISO 15765-2. However, when the data length of the data to be transmitted does not fit in one frame of CAN, the data is segmented and transmitted in a plurality of frames. Although unicast communication is defined, ISO 15765-2 is related to broadcast communication. There are no provisions.

  Therefore, conventionally, when segmented data is transmitted to all ECUs, it is realized by unicast communication. At this time, when segmented data is transmitted by unicast communication, there is a problem that the time required for communication becomes long. In addition, since the communication completion times are different, the same data cannot be passed simultaneously.

  Specifically, as shown in FIG. 12, it is considered that segmented data is transmitted from the diagnostic apparatus to two ECUs X and Y. In unicast communication, data is first transmitted to one X-ECU, and then the same data is transmitted to the Y-ECU.

  Here, first, the diagnostic device transmits FF (First Frame) to the X-ECU. FF is start information indicating the start of transmission. In response to this, the X-ECU transmits FC (Flow Control). FC is flow control information related to data reception in the X-ECU. Details will be described later.

  Next, the diagnostic device repeatedly transmits CF (Consecutive Frame) based on the FC from the X-ECU. When the data transmission is completed, a response is obtained from the X-ECU by SF (Single Frame).

Next, the diagnostic device performs data transmission to the Y-ECU in the same procedure as data transmission to the X-ECU.
Therefore, in such unicast communication, the time required for communication becomes long. In addition, since the data transmission completion times are different, such as T1 and T2, the same data cannot be passed simultaneously.

  Therefore, in the present embodiment, as shown in FIG. 2, broadcast communication is performed even when segmented data is transmitted. In FIG. 2, data transmission to the two ECUs 21 and 22 of A and B is considered for the sake of simplicity.

  The diagnostic apparatus 10 first transmits FFs to the two ECUs 21 and 22 of A and B. On the other hand, the ECUs 21 and 22 of A and B respectively transmit FC. However, when the contents of these FCs are different, it is not known how to transmit the CF after that.

Here, explanation about FC is added.
As shown in FIG. 3, FC includes FS, BS, and STmin.
FS takes one of the values 0, 1, and 2. “0” is “continuous reception is possible”, “1” is “standby” indicating that the data cannot be received immediately, and “2” is “overflow” indicating that the data amount is too large to be received. It is.

The BS indicates the number of frames that can be continuously received. “0” indicates that the frames can be continuously received without limitation, and 1 to 255 indicates the “number of frames” that can be continuously received.
STmin indicates a receivable interval between the CF and the next CF, and 0-127 indicates that reception is possible if the 0-127 (ms) interval is free. Also, 240 to 249 indicate that reception is possible if 240 is subtracted and multiplied by 100, that is, 100 to 900 μs or more.

  Therefore, in FIG. 2, the diagnostic apparatus 10 obtains the CF based on the transmitted FC, whether or not the CF can be received, the number of frames that can be continuously received, and the receivable interval. Send.

However, as shown in FIG. 2, when the FCs transmitted from the A and B ECUs 21 and 22 are different, it is not known how to transmit the CF thereafter.
Therefore, in the present embodiment, the minimum values of FS, BS, and STmin are adopted for FC transmitted from the ECUs 21 to 23 of A to C. That is, by adopting the respective minimum values, reception is possible in all the ECUs 21 to 23.

For example, this will be described with reference to FIG.
In the FS, “0” is “continuous reception is possible”, “1” is “standby”, and “2” is “overflow”. Therefore, if the FS from the A-ECU 21 is “0”, the FS from the B-ECU 22 is “0”, and the FS from the C-ECU 23 is “1”, the lowest value “1” is set. adopt. FS changes relatively dynamically.

  BS indicates the number of frames that can be continuously received. “0” indicates that frames can be continuously received without limitation, and 1-255 indicates the number of frames that can be continuously received. This value is generally a fixed value. Therefore, if the BS from the A-ECU 21 is “0”, the BS from the B-ECU 22 is “1”, and the BS from the C-ECU 23 is “3”, the lowest value “1” is adopted. To do.

  Furthermore, STmin indicates a receivable interval between the CF and the next CF. This value is generally a fixed value. If the STmin from the A-ECU 21 is “0”, the STmin from the B-ECU 22 is “100”, and the STmin from the C-ECU 23 is “245”, the reception intervals are 0 ms, 100 ms, 500 ((245-240) × 100)) μs. Therefore, the minimum value of 100 ms is adopted.

That is, by adopting the minimum value of each parameter in this way, any of the ECUs 21 to 23 of A to C can receive data.
Next, transmission processing in the diagnostic apparatus 10 will be described based on the flowcharts of FIGS. 5 and 6.

  In the first S100, the FF is transmitted by broadcast. This process transmits FF which shows a transmission start to each ECU21-23 of AC. On the other hand, each ECU 21-23 transmits FC.

In subsequent S110, the FC is received. As described above, FC includes FS, BS, and STmin.
In the next S120, it is determined whether or not there is an overflow. Specifically, an affirmative determination is made when the FS included in the FC received in S110 is “2”. If it is determined that there is an overflow (S120: YES), an error process is performed in S130, and then the transmission process is terminated. In this case, transmission to all the ECUs 21 to 23 is stopped. On the other hand, when it is determined that there is no overflow (S120: NO), the process proceeds to S140.

  In S140, it is determined whether or not the apparatus is on standby. Specifically, an affirmative determination is made when the FS included in the FC received in S110 is “1”. If it is determined that the process is waiting (S140: YES), the timeout time is retriggered in S150. Although not shown in the flowchart, when transmitting the FF in S100, a counter for measuring the timeout time is started. For example, the timeout time is set to 1000 ms, and if there is no FC response during this time, error processing is performed. Here, when any of the ECUs 21 to 23 of A to C is on standby, the timer is reset and the timeout time is retriggered. On the other hand, if it is determined that it is not standby (S140: NO), that is, if FS is “0” and reception is possible, the process proceeds to S160.

  In S160, when the performance of the BS is poor, the BS is stored. This process stores the minimum value of the BS included in the received FC. At first, BS is stored unconditionally, and at the time of the second and subsequent processing, the already stored BS is compared with the BS included in the FC received this time, and is overwritten when the value of the BS received this time is bad .

  In subsequent S170, when the performance of STmin is poor, the STmin is stored. This process stores the minimum value of STmin included in the received FC. First, STmin is stored unconditionally, and during the second and subsequent processing, the STmin that has already been stored is compared with the STmin that is included in the FC received this time, and is overwritten if the STmin value received this time is bad. .

  Next, in S180 in FIG. 6, it is determined whether or not the continuous reception of FC has been received from all the ECUs 21 to 23. It is conceivable that the number of ECUs 21 to 23 is acquired in advance as a response number by transmitting a non-segmented message by broadcast communication in advance. Here, when it is determined that the FCs can be continuously received from all the ECUs 21 to 23 (S180: YES), the process proceeds to S190. On the other hand, if any of the ECUs 21 to 23 has not received FC (S180: NO), the processing from S110 in FIG. 5 is repeated.

In S190, the CF is transmitted based on the BS stored in S160 and the STmin stored in S170.
In subsequent S200, it is determined whether or not all data has been transmitted. If it is determined that all data has been transmitted (S200: YES), the transmission process is terminated. On the other hand, while there is data that has not been transmitted (S200: NO), the process proceeds to S210.

  In S210, it is determined whether or not the number of frames that can be transmitted has been reached. This process is to determine whether or not the number of frames that is the minimum value of the BS has been reached. If it is determined that the number of frames that can be transmitted has been reached (S210: YES), the process proceeds to S110 in FIG. On the other hand, when it is determined that the number of frames that can be transmitted has not been reached (S210: NO), the processing from S190 is repeated.

  Next, the reception process in each ECU 21-23 is demonstrated based on the flowchart of FIG.7 and FIG.8. The same processing is executed in all the ECUs 21 to 23, but here, the A-ECU 21 will be mainly described.

In the first S300, the FF is received. This process corresponds to S100 in FIG. 5 and receives the FF from the diagnostic apparatus 10.
In subsequent S310, the FC is transmitted. As described above, FC includes FS, BS, and STmin.

In the next S320, the FCs transmitted by the other B and C ECUs 22 and 23 are received. This process is performed in order to know what kind of performance the ECUs 22 and 23 of B and C have.
In continuing S330, it is judged whether other ECU22,23 is an overflow. Specifically, an affirmative determination is made when the FS included in the FC from the other ECUs 22 and 23 received in S320 is “2”. If it is determined that there is an overflow (S330: YES), error processing is performed in S340, and then the reception processing is terminated. On the other hand, when it is determined that there is no overflow (S330: NO), the process proceeds to S350.

  In S350, it is determined whether the other ECUs 22 and 23 are on standby. Specifically, an affirmative determination is made when the FS included in the FC from the other ECUs 22 and 23 received in S320 is “1”. If it is determined that the process is waiting (S350: YES), the timeout time is retriggered in S360. The retrigger of the timeout time is the same as that of the diagnostic apparatus 10. On the other hand, when it is determined that it is not standby (S350: NO), the process proceeds to S370.

  In S370, if the performance of the BS is poor, the BS is stored. In this process, the own BS and the BS included in the FC from the other ECUs 22 and 23 are compared, and the minimum value of the BS is stored.

  In subsequent S380, when the performance of STmin is poor, the STmin is stored. In this process, the own STmin is compared with the STmin included in the FC from the other ECUs 22 and 23, and the minimum value of STmin is stored.

  Next, in S390 in FIG. 8, it is determined whether or not a CF has been sent. If it is determined that a CF has been sent (S390: YES), the CF is received in S400, and then the process proceeds to S410. On the other hand, when it is determined that the CF has not been sent (S390: NO), the processing from S320 in FIG. 7 is repeated.

  In subsequent S410, it is determined whether or not all data has been received. If it is determined that all data has been received (S410: YES), the reception process is terminated. On the other hand, while there is data not received (S410: NO), the process proceeds to S420.

  In S420, it is determined whether the number of receivable frames has been reached. This process is to determine whether or not the number of frames that is the minimum value of the BS has been reached. If it is determined that the number of receivable frames has been reached (S420: YES), the process proceeds to S310 in FIG. On the other hand, when it is determined that the number of receivable frames has not been reached (S420: NO), the processing from S400 is repeated.

  As described above in detail, in the present embodiment, segmented data is transmitted from the diagnostic apparatus 10 to the plurality of ECUs 21 to 23 connected to the diagnostic apparatus 10 via the bus line 40 by broadcast communication.

  The diagnostic apparatus 10 transmits the FF to all the ECUs 21 to 23 of A to C (S100 in FIG. 5), and when the ECU 21 to 23 receives this FF (S300 in FIG. 7), the ECU 21 to 23 Is transmitted (S310). Based on this FC, the diagnostic device 10 stores the minimum values of BS and STmin included in the FC (S160 and S170 in FIG. 5), and transmits the CF (S190 in FIG. 6). When the CF is sent from the diagnostic device 10 (S390 in FIG. 8: YES), each of the ECUs 21 to 23 receives the CF (S400).

  That is, the diagnostic device 10 uses the start information transmission unit 10a that transmits start information (FF) indicating the start of data transmission, and the flow control information (FC) transmitted from the ECUs 21 to 23, to the flow control information. By adopting the lowest value of the included information, it has data transmission means 10b that repeatedly transmits data in a manner that can be received by all of the plurality of ECUs 21 to 23, while the ECUs 21 to 23 transmit start information. When the start information transmitted by the means 10a is received, it has control information transmitting means 21a for transmitting flow control information, and data receiving means 21b for receiving data transmitted by the data transmitting means.

  That is, since the flow control information is transmitted from the ECUs 21 to 23, data is transmitted to all of the plurality of ECUs 21 to 23 at the same time by adopting the lowest values of various information included in the flow control information. . In this way, the communication time can be reduced even when segmented data is transmitted to all the ECUs 21 to 23. Moreover, data transmission / reception can be completed at the same time.

  Further, in the present embodiment, taking A-ECU 21 as an example, A-ECU 21 receives FC from ECUs 22 and 23 of other B and C, and stores the minimum values of BS and STmin included in FC. (S370, S380 in FIG. 7), the CF from the diagnostic apparatus 10 is received (S400). The same applies to the B-ECU 22 and the C-ECU 23. That is, the data receiving unit 21b receives data by adopting the lowest value of the information included in the flow control information based on the flow control information transmitted from another ECU. Thereby, in the data transmission of CF of the diagnostic apparatus 10, ECU21-23 functions appropriately.

  Furthermore, in this embodiment, the diagnostic device 10 transmits CF when receiving the continuous reception of FCs from all the ECUs 21 to 23 (S180 in FIG. 6) (S190). That is, the data transmission means 10b will transmit data, if flow control information is received from all of several ECU21-21. Thereby, data transmission / reception can be completed with respect to all the ECUs 21 to 23 at the same time.

  Specifically, as described above, the number of ECUs 21 to 23 may be acquired in advance as the number of responses by transmitting a non-segmented message in advance by broadcast communication. Moreover, you may make it investigate the number of ECUs by using another communication system other than the process which concerns on such a diagnosis, and transmitting data. Furthermore, if the number of ECUs is determined at the time of system design, the number of ECUs in the design information may be adopted.

  Specifically, the data transmission unit 10b receives flow control information from all of the plurality of ECUs 21 to 23 when a predetermined time has elapsed since the start information was transmitted by the start information transmission unit 10a. It is possible to do. Thus, when judging with response time, as shown in FIG.4 (b), it is possible to acquire beforehand the time to FC response about each ECU21-23, and employ | adopt the minimum value. For example, when the A-ECU 21 is 100 ms, the B-ECU 22 is 5 ms, and the C-ECU 23 is 0 ms, 100 ms is employed. Thus, when the response of ECU21-23 is judged by the elapsed time after transmitting start information, it is advantageous at the point that it can judge comparatively easily.

[Second Embodiment]
In the above embodiment, the diagnostic device 10 transmits data based on the FC transmitted from the ECUs 21 to 23 of A to C. On the other hand, this embodiment has a configuration in which a specific ECU that is a representative is determined first, and the specific ECU transmits FC to the diagnostic device 10. Therefore, only the A-ECU 21 includes the control information transmission unit 21a.

First, transmission processing in the diagnostic apparatus 10 will be described based on the flowcharts of FIGS. 9 and 10. The description will be continued assuming that the specific ECU is the A-ECU 21.
In the first S500, the FF is transmitted by broadcast. This process transmits FF which shows a transmission start to each ECU21-23 of AC. In response to this, the A-ECU 21 transmits FC.

  In subsequent S510, the FC is received. As described above, FC includes FS, BS, and STmin. In this case, the A-ECU 21 representatively transmits the lowest values of FS, BS, and STmin.

  In the next S520, it is determined whether or not there is an overflow. Specifically, an affirmative determination is made when the FS included in the FC received in S510 is “2”. If it is determined that there is an overflow (S520: YES), an error process is performed in S530, and then the transmission process is terminated. In this case, transmission to all the ECUs 21 to 23 is stopped. On the other hand, when it is determined that there is no overflow (S520: NO), the process proceeds to S540.

  In S540, it is determined whether or not the apparatus is on standby. Specifically, an affirmative determination is made when the FS included in the FC received in S510 is “1”. If it is determined that the process is waiting (S540: YES), the timeout time is retriggered in S550. On the other hand, if it is determined that it is not standby (S540: NO), that is, if FS is “0” and reception is possible, the process proceeds to S560.

  In S560, the BS is stored. This process stores the BS included in the FC from the A-ECU 21. The A-ECU 21 transmits the lowest one of the BSs of the ECUs 21 to 23 of A to C.

  In subsequent S570, STmin is stored. This process stores the STmin included in the FC from the A-ECU 21. The A-ECU 21 transmits the lowest one among the STmins of the ECUs 21 to 23 of A to C.

In step S580 in FIG. 10, the CF is transmitted. In this process, the CF is transmitted based on the BS stored in S560 and the STmin stored in S570.
In subsequent S590, it is determined whether or not all data has been transmitted. If it is determined that all data has been transmitted (S590: YES), the transmission process is terminated. On the other hand, while there is data that has not been transmitted (S590: NO), the process proceeds to S600.

  In S600, it is determined whether or not the number of frames that can be transmitted has been reached. This process is to determine whether or not the number of frames that is the minimum value of the BS has been reached. If it is determined that the number of frames that can be transmitted has been reached (S600: YES), the process proceeds to S510 in FIG. On the other hand, when it is determined that the number of frames that can be transmitted has not been reached (S600: NO), the processing from S580 is repeated.

Next, the specific ECU reception process in the A-ECU 21 will be described based on the flowchart of FIG.
In the first S700, the FF is received. This process corresponds to S500 in FIG. 9 and receives the FF from the diagnostic apparatus 10.

  In subsequent S710, the FC is transmitted. The A-ECU 21 transmits the FC to the diagnostic device 10 as a representative of the other ECUs 22 and 23. This FC includes the minimum values of FS, BS, and STmin.

In the next S720, the CF sent from the diagnostic apparatus 10 based on the transmitted FC is received.
In subsequent S730, it is determined whether or not all data has been received. If it is determined that all the data has been received (S730: YES), the specific ECU reception process is terminated. On the other hand, while there is data that has not been received (S730: NO), the process proceeds to S740.

  In S740, it is determined whether the number of receivable frames has been reached. This process determines whether or not the number of frames indicated by the BS has been reached. If it is determined that the number of receivable frames has been reached (S740: YES), the processing from S710 is repeated. On the other hand, if it is determined that the number of receivable frames has not been reached (S740: NO), the processing from S720 is repeated.

Next, the reception process in the ECUs 22 and 23 of B and C will be described based on the flowchart of FIG.
In the first S800, the FF is received. This process corresponds to S500 in FIG. 9 and receives the FF from the diagnostic apparatus 10.

In the next S810, the CF sent from the diagnostic apparatus 10 based on the transmitted FC is received.
In subsequent S820, it is determined whether or not all data has been received. If it is determined that all data has been received (S820: YES), the reception process is terminated. On the other hand, while there is data that has not been received (S820: NO), the processing from S810 is repeated.

  Also in the present embodiment, segmented data is transmitted from the diagnostic device 10 to the plurality of ECUs 21 to 23 connected to the diagnostic device 10 via the bus line 40 by broadcast communication.

  The diagnostic apparatus 10 transmits FFs to all ECUs 21 to 23 of A to C (S500 in FIG. 9), and when the ECUs 21 to 23 receive this FF (S700 in FIG. 11A, FIG. 11B). ) In step S800), the A-ECU 21 transmits the FC on behalf of it (S710 in FIG. 11A). Based on this FC, the diagnostic device 10 stores the BS and STmin included in the FC (S560, S570 in FIG. 9), and transmits the CF (S580 in FIG. 10). Each of the ECUs 21 to 23 receives the CF when the CF is sent from the diagnostic device 10 (S720 in FIG. 11A, S810 in FIG. 11B).

  That is, only a specific ECU 21 among the ECUs 21 to 23 has the control information transmitting unit 21a, and the control information transmitting unit 21a is a flow control composed of the minimum value of information included in the flow control information of each ECU 21 to 23. Information is transmitted to the diagnostic apparatus 10.

  That is, since flow control information is transmitted from a specific A-ECU 21, data is transmitted to all of the plurality of ECUs 21 to 23 at the same time by employing various information included in the flow control information. In this way, the communication time can be reduced even when segmented data is transmitted to all the ECUs 21 to 23. Moreover, data transmission / reception can be completed at the same time.

  In the present embodiment, when the FC from the A-ECU 21 is received (S510 in FIG. 9), the CF is transmitted (S580 in FIG. 10). That is, when the data transmission unit 10b receives flow control information from a specific ECU 21, the data transmission unit 10b transmits data. In this case, it is conceivable that the ECU with the longest time until the FC response is the specific ECU. In this case, since a specific specific ECU 21 is determined, it is advantageous in that it is not necessary to acquire the number of ECUs 21 to 23.

As described above, the present invention is not limited to the above-described embodiment, and can be implemented in various forms without departing from the technical scope thereof.
The error processing in S130 in FIG. 5, S340 in FIG. 7, and S530 in FIG. 9 interrupts the subsequent processing. On the other hand, the process may be continued by excluding the ECU that has overflowed. Further, a process for shortening the data length may be performed on the diagnostic device 10 side.

  DESCRIPTION OF SYMBOLS 1 ... Diagnostic system, 10 ... Diagnosis apparatus, 10a ... Start information transmission means, 10b ... Data transmission means, 21, 22, 23 ... ECU, 21a ... Control information transmission means, 21b ... Data reception means, 30 ... Gateway ECU, 40 ... bus line, 90 ... center

Claims (9)

Diagnostic system (1) for transmitting segmented data from a diagnostic device (10 or 30) to a plurality of ECUs (21, 22, 23) connected to the diagnostic device via a bus line (40) by broadcast communication ) And
The diagnostic device comprises:
Start information transmitting means (10a) for transmitting start information (FF) indicating the start of data transmission;
Based on the flow control information (FC) transmitted from the ECU, by adopting the lowest value of the information included in the flow control information, the data is repeatedly transmitted in a manner that can be received by all of the plurality of ECUs. Data transmission means (10b)
The ECU
When receiving the start information transmitted by the start information transmitting means, the control information transmitting means (21a) for transmitting the flow control information,
A diagnostic system comprising data receiving means (21b) for receiving the data transmitted by the data transmitting means. The diagnostic system according to claim 1,
The data receiving means receives the data based on the flow control information transmitted from another ECU and adopts the lowest value of the information included in the flow control information (S400).
Diagnostic system characterized by The diagnostic system according to claim 1 or 2,
When the data transmission means receives the flow control information from all of the plurality of ECUs, the data transmission means transmits the data (S180: YES, S190).
Diagnostic system characterized by The diagnostic system according to claim 3,
The data transmission means receives the flow control information from all of the plurality of ECUs when a predetermined time has elapsed since the start information was transmitted by the start information transmission means. Diagnostic system. The diagnostic system according to claim 1,
Only a specific ECU of the ECUs has the control information transmission means,
The control information transmitting means transmits the flow control information including the lowest value of information included in the flow control information of each ECU to the diagnostic device (S710).
Diagnostic system characterized by The diagnostic system according to claim 5,
When the data transmission means receives the flow control information from the specific ECU, the data transmission means transmits the data (S580).
Diagnostic system characterized by In the diagnostic system as described in any one of Claims 1-6,
The flow control information includes information (FS) indicating whether reception is possible, information (BS) indicating the number of continuously receivable data, and information (STmin) indicating a receivable interval in continuous reception. A diagnostic system characterized by   The diagnostic apparatus which comprises the diagnostic system as described in any one of Claims 1-7.   ECU which comprises the diagnostic system as described in any one of Claims 1-7.