JP5729269B2 - Failure diagnosis system and diagnosis support apparatus constituting failure diagnosis system - Google Patents

Description

  The present invention relates to a communication system that is connected to a common bus communication path and communicates with each other via the bus communication path.

2. Description of the Related Art Conventionally, communication systems that use bus communication paths such as CAN and LIN are known as communication systems mounted on vehicles.
In such a communication system, each node has a wake-up mode that is an operation mode in which all functions assigned in advance can be executed, and an operation mode in which some functions are stopped to reduce power consumption. Some work in sleep mode. Conventionally, an ECU connected to an ignition (IG) power line generally wakes up during IG-ON and sleeps during IG-OFF, but in recent years, in wake-up mode, IG- Some nodes can be put to sleep even during ON.

  In other words, the wakeup mode includes a selective wakeup mode in which only a designated node sleeps or a designated sleep node wakes up. That is, the selective wakeup mode is a form of the wakeup mode, and is a power saving mode in which only some of the nodes are put to sleep or wakeup. In this case, in a node that is in the sleep state in the selective wakeup mode, the signal processing unit is in the sleep state, and the transceiver that directly exchanges data with the bus communication path generally remains activated. It is.

  By the way, as a method for determining a failure of the communication system described above, a method of connecting a diagnostic device called a diagnostic checker or the like to a bus communication path via a diagnostic connector is known (for example, see Patent Document 1). In this case, the diagnosis device makes a diagnosis request (diagnosis request) to the node to be diagnosed, and the node responds the self-diagnosis result to the diagnosis device, thereby performing failure diagnosis.

JP-A-9-172470

  However, the failure diagnosis by the above-described diagnosis device is realized as a function by the signal processing unit of the node. Therefore, the node that has entered the sleep state in the selective wakeup mode cannot respond to the diagnosis request from the diagnosis device because the signal processing unit is in the sleep state. As a result, the conventional diagnosis apparatus cannot perform failure diagnosis of a node that is in the sleep state in the selective wakeup mode. In addition, it is impossible to determine whether it is impossible to respond because it is in a sleep state or whether it cannot respond because of a failure.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a failure diagnosis system capable of performing a failure diagnosis by a diagnosis device even for a node that is in a sleep state in a selective wakeup mode. Is to provide.

Fault diagnosis system has been proposed in order to achieve the above object, a communication network to which a plurality of nodes which are connected to the same bus channel, the data communication with the connected nodes from outside the communication network And a diagnostic device for performing.

  Here, the communication network is operable in a selective wake-up mode. The selective wakeup mode is a mode in which nodes are individually operated in either a sleep state in which some functions are stopped or a wakeup state in which a function assigned in advance can be executed. In addition, the diagnosis device outputs a diagnosis request for causing the node to respond with a self-diagnosis result.

  Under such a configuration, in the present invention, when a diagnosis request is output from the diagnosis device, the diagnosis support device searches for a diagnosis target node included in the diagnosis request and puts the diagnosis target node into a wake-up state. A wake-up signal for shifting is output.

  Conventionally, a node that is in the sleep state in the selective wake-up mode cannot respond to a diagnosis request from the diagnostic device, and cannot determine whether the node has failed or is in the sleep state. It was.

  Therefore, in the present invention, the diagnosis support device that receives the diagnosis request from the diagnosis device shifts the node to be diagnosed to the wake-up state. Thereby, when a diagnostic request is output from the diagnostic apparatus thereafter, the node to be diagnosed can respond.

In this way, it is possible to perform failure diagnosis by the diagnosis device even for a node that is in the sleep state in the selective wakeup mode.
Specifically, node is, wake a signal processing unit for stopping the function in sleep state, assuming that it has a transceiver operating in a sleep state, the diagnosis support apparatus, a node to be diagnosed It is conceivable to output a wake-up frame including an activation ID for shifting to the up state to the bus communication path. In this case, the transceiver determines the activation ID included in the wakeup frame and controls power supply to the signal processing unit.

  Here, it is conceivable that the activation ID is set corresponding to each node. In this case, when a plurality of nodes are to be diagnosed, a plurality of activation IDs corresponding to each node are set in the wake-up frame.

  It is also conceivable that a common activation ID is set corresponding to a plurality of predetermined nodes. In this case, when the predetermined node is a diagnosis target, one activation ID corresponding to the node is set in the wakeup frame. For example, a common activation ID may be set for all nodes. That is, when all the nodes are to be diagnosed, one activation ID corresponding to all the nodes is set in the wake-up frame.

In this way, the node to be diagnosed can be shifted to the wake-up state using the wake-up frame in the selective wake-up mode.
Further specifically, on the assumption that the communication network has a relay performing power supply control for shifting the node to wake-up state in correspondence to each node, diagnosis support apparatus, a diagnosis target It is conceivable to output a wake-up signal to the relay corresponding to the node. In this case, apart from the communication via the bus communication path, the node to be diagnosed is directly shifted to the wake-up state via a relay.

  In this way, although it is necessary to provide a relay corresponding to each node in the communication network, the node to be diagnosed can be shifted to the wake-up state by relatively simple control.

  Incidentally, the diagnosis support apparatus searches for a diagnosis target node based on a diagnosis request, but there may be a related node necessary for diagnosis of the diagnosis target node. For example, when the engine ECU is a diagnosis target, the transmission ECU or the air conditioner ECU becomes a related node necessary for the diagnosis of the engine ECU.

Therefore, diagnostic support apparatus is configured to search for nodes to be diagnosed, it searches the relevant nodes required for diagnosis of the diagnosis target node, outputting a wake-up signal for shifting the associated node to the wakeup state You may make it do. In this way, related nodes necessary for diagnosis of the diagnosis target node can be shifted to the wake-up state.

  In the above configuration, it is conceivable that the diagnosis device repeatedly outputs a diagnosis request when a response from the communication device cannot be obtained. In other words, since the diagnosis target node enters the wake-up state in the diagnosis support device by outputting the first diagnosis request from the diagnosis device, if the diagnosis request is repeatedly output, the diagnosis target node that has shifted to the wake-up state The diagnosis result is transmitted.

In contrast, diagnostic support apparatus, when a node in the diagnosis request from the diagnosis apparatus can not respond by a sleep state, it is also possible to return a response on behalf of the node. In this way, the diagnostic device can recognize that the node to be diagnosed cannot respond because it is in the sleep state.

Further, diagnostic support apparatus nodes when the transition from the sleep state to the wake-up state, may be transmitted to the node on behalf of the diagnostic device a diagnosis request from the diagnosis device. In this way, it is not necessary for the diagnostic apparatus to repeatedly output a diagnosis request as described above, and useless communication from the diagnostic apparatus can be suppressed.

Above has been described as an invention of a fault diagnosis system can be implemented as an invention of a diagnosis support apparatus that constitutes the fault diagnosis system. Even in such a failure support apparatus, the same effects as those of the failure diagnosis system can be obtained.

It is a block diagram which shows schematic structure of a failure diagnosis system. It is a functional block diagram of diagnostic assistance ECU. It is a block diagram which shows schematic structure of ECU used as a diagnostic object. It is a flowchart which shows the wake-up process which diagnostic assistance ECU performs. It is an example of the table which shows a response | compatibility with ECU information and starting ID. It is a block diagram which shows schematic structure of the failure diagnosis system of another embodiment.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram illustrating a schematic configuration of the failure diagnosis system 1. The failure diagnosis system 1 includes an in-vehicle communication network 10 and a diagnosis device 20. In the communication network 10, serial communication is performed by a so-called CAN (Controller Area Network) protocol.

  The diagnostic device 20 is connected to the communication network 10 via a diagnostic connector 30. The communication network 10 includes a diagnosis support ECU 40 and a plurality of ECUs 50 that can be diagnosed. These ECUs 40 and 50 function as nodes and are connected to each other via a bus communication path 60. The ECU 50 is embodied as an engine ECU, a transmission ECU, an air conditioner ECU, a navigation ECU, or the like.

  The bus communication path 60 is configured such that when a high level signal and a low level signal are simultaneously output from different ECUs 40 and 50, the signal level on the bus communication path 60 becomes a low level. To achieve mediation.

  A diagnostic frame is used for communication between the diagnostic device 20 and the ECU 50. There are two types of diagnostic frames: a request frame for requesting transmission of a diagnosis result and a variable-length response frame for transmitting data specified by the request frame. The request frame includes an identifier (NID) of an ECU that requests transmission of a diagnosis result and an identifier (SID) that represents diagnosis contents. On the other hand, the response frame includes size information indicating the size of the data (response) in addition to the data.

  Here, each ECU 50 operates in a wake-up mode that is an operation mode in which all functions assigned in advance can be executed, and a sleep mode that is an operation mode in which some functions are stopped in order to reduce power consumption. This is wake-up / sleep of the entire failure diagnosis system 1, and the operation mode of diagnosis is switched by turning on / off an ignition switch of the vehicle.

The wakeup mode includes a selective wakeup mode. In the selective wake-up mode, the ECU 50 sleeps by individual determination. Hereinafter, the sleep in the selective wake-up mode is simply referred to as “sleep”.
The diagnosis support ECU 40 monitors in real time whether the ECU 50 of the failure diagnosis system 1 that performs selective wake-up is in the wake-up mode or the sleep mode.

  A diagnostic request is transmitted from the diagnostic device 20 to such a communication network 10. At this time, when the ECU 50 to be diagnosed is sleeping, the diagnosis support ECU 40 causes the ECU 50 to be diagnosed to wake up.

As shown in FIG. 2, the diagnosis support ECU 40 includes a frame reception unit 41, a reception ID determination unit 42, a diagnosis target ECU search unit 43, and a frame transmission unit 44.
The frame receiving unit 41 is configured to receive a frame transmitted on the bus communication path 60. The reception ID determination unit 42 determines whether or not the reception frame received by the frame reception unit 41 is a diagnostic frame. When the frame is a diagnostic frame, the diagnostic target ECU search unit 43 specifies the ECU 50 to be diagnosed, and the frame transmission unit 44 transmits a wakeup frame for wakeup of the ECU 50 to the bus communication path 60.

  On the other hand, the ECU 50 includes a CPU 51, a transceiver 52, and a power supply circuit 53 as shown in FIG. Here, the CPU 51 has a CAN controller 54. During wakeup, power is supplied from the power supply circuit 53 to both the CPU 51 and the transceiver 52. Thus, during the wakeup, when a diagnosis request from the diagnostic device 20 is received via the transceiver 52, the CPU 51 determines whether or not the diagnosis request is for the own ECU 50. Self-diagnosis is performed, and the diagnosis result is output to the bus communication path 60 via the transceiver 52. This is a response to the diagnosis request of the diagnosis device 20, and the diagnosis of the ECU 50 is completed.

  During sleep, power is supplied from the power supply circuit 53 only to the transceiver 52. That is, the power supply to the CPU 51 is stopped. Therefore, a response to the diagnosis request from the diagnostic device 20 cannot be returned.

  Therefore, in the present embodiment, the diagnosis support ECU 40 executes the wake-up process to wake up the ECU 50 to be diagnosed. FIG. 4 is a flowchart showing the wake-up process.

  In first S100, it is determined whether or not the received frame is a diagnostic frame. This process is realized as a function of the reception ID determination unit 42. Here, it is determined based on the ID included in the header of the received frame that the frame is a diagnostic frame. If it is determined that the received frame is a diagnostic frame (S100: YES), the process proceeds to S110. On the other hand, when it is determined that the received frame is not a diagnostic frame (S100: NO), the subsequent process is not executed and the wake-up process is terminated.

In S110, the ECU 50 to be diagnosed is searched. In this process, the ECU 50 to be diagnosed is searched based on the ECU information included in the data of the diagnostic frame.
In subsequent S120, an activation ID is set in the wake-up frame. In this process, the activation ID corresponding to the ECU 50 to be diagnosed is set in the wake-up frame.
The processing of S110 and S120 is realized as a function of the diagnosis target ECU search unit 43.

  The correspondence relationship between the ECU 50 to be diagnosed and the activation ID for waking up the ECU 50 is stored as a table as shown in FIG. Here, the activation ID is set for each ECU 50.

  Further, as shown in FIG. 5, the table also includes information on the diagnosis-related ECU 50 that needs to be diagnosed in relation to the ECU 50 to be diagnosed. For example, when the ECU 50 to be diagnosed is an engine ECU, the transmission ECU and the air conditioner ECU are the diagnosis-related ECU 50. Therefore, in the example of FIG. 5, when the ECU 50 to be diagnosed is an engine ECU, in addition to the activation ID “0x701” corresponding to the engine ECU, activation IDs “0x702” and “0x703” corresponding to the transmission ECU and the air conditioner ECU are set. Set to wake-up frame.

Furthermore, when the ECUs 50 to be diagnosed are all ECUs, a predetermined activation ID “0x7FF” is set.
In the next S130, a wakeup frame is transmitted. This process transmits a wake-up frame in which the activation ID is set in S120, and is realized as a function of the frame transmission unit 44.

  When a wake-up frame is transmitted on the bus communication path 60 by such wake-up processing, the sleeping ECU 50 receives the wake-up frame at the transceiver 52 and is set to its own activation ID and wake-up frame. If the activation IDs match, the transceiver 52 instructs the power supply circuit 53 to supply power to the CPU 51. As a result, the ECU 50 to be diagnosed and the ECU 50 related to the diagnosis of the ECU 50 wake up. If the activation ID included in the wake-up frame from the diagnosis support ECU 40 is “0x7FF”, all the ECUs 50 start supplying power from the power supply circuit 53 to the CPU 51 and wake up.

  After the ECU 50 wakes up, as described above, when a diagnostic request from the diagnostic device 20 is received via the transceiver 52, the CPU 51 determines whether or not the diagnostic request is directed to the own ECU 50. If it is a diagnosis request, a self-diagnosis is performed and the diagnosis result is transmitted to the bus communication path 60 via the transceiver.

  As described above in detail, in the present embodiment, the diagnosis support ECU 50 determines whether or not the received frame from the diagnostic device 20 is a diagnostic frame (S100 in FIG. 4), and if it is a diagnostic frame (S100). : YES), the diagnosis target ECU 50 is searched (S110). Then, the activation ID of the diagnosis target ECU 50 is set in the wakeup frame (S120), and the wakeup frame is transmitted to the bus communication path 60 (S130). The sleeping ECU 50 receives the wake-up frame at the transceiver 52, compares its own activation ID with the activation ID set in the wake-up frame, and if they match, the transceiver 52 sends to the CPU 51. The power supply circuit 53 is instructed to supply power (see FIG. 3).

  That is, in the present embodiment, the diagnosis support ECU 40 that receives the diagnosis frame from the diagnosis device 20 causes the ECU 50 to be diagnosed to shift to the wake-up state. Thereby, when a diagnostic frame is output from the diagnostic device 20 thereafter, the ECU 50 to be diagnosed can respond.

In this way, it is possible to perform failure diagnosis by the diagnosis device 20 on the ECU 50 that is in the sleep state in the selective wakeup mode.
In the present embodiment, as shown in FIG. 3, the ECU 50 includes a CPU 51 that stops functioning in the sleep state and a transceiver 52 that operates in the sleep state. A wakeup frame including an activation ID for causing the ECU 50 to shift to the wakeup state is output to the bus communication path (S120 and S130 in FIG. 4). At this time, the activation ID is set corresponding to each ECU as shown in FIG. Further, when all the ECUs 50 are to be diagnosed, a predetermined activation ID “0x7FF” is set. Thereby, the ECU 50 to be diagnosed can be shifted to the wake-up state by using the wake-up frame in the selective wake-up mode.

  Furthermore, in the present embodiment, when searching for the ECU 50 to be diagnosed based on the diagnosis frame, the diagnosis-related ECU 50 necessary for diagnosis of the ECU 50 to be diagnosed is also searched (S110 in FIG. 4). The activation ID of the diagnosis-related ECU 50 is also set in the wake-up frame (S120). As a result, the diagnosis-related ECU 50 necessary for diagnosis of the ECU 50 to be diagnosed can also be shifted to the wake-up state.

  The failure diagnosis system 1 in the present embodiment constitutes the “failure diagnosis system” in the claims, the communication network 10 constitutes the “communication network”, the ECU 50 constitutes the “node”, and the diagnosis-related ECU 50 The “related node” is configured, the CPU 51 of the ECU 50 configures the “signal processing unit”, the transceiver 52 configures the “transceiver”, the bus communication path 60 configures the “bus communication path”, and the diagnostic device 20 “ The diagnosis support ECU 40 constitutes a “diagnosis support device”.

Further, the diagnostic frame output from the diagnostic device 20 corresponds to a “diagnosis request”, and the wakeup frame output from the diagnostic support ECU 40 corresponds to a “wakeup signal”.
The present invention is not limited to the above-described embodiments, and can be implemented in various forms without departing from the technical scope thereof.

  (A) In the above embodiment, the diagnosis support ECU 40 outputs a wakeup frame in which the activation ID is set to the bus communication path 60, and the ECU 50 receives the activation ID of the ECU 50 in the wakeup frame received by the transceiver 52. Is included, the transceiver 52 instructs the power supply circuit 53 to supply power to the CPU 51.

  On the other hand, in the second embodiment, as shown in FIG. 6, the relay 55 corresponding to each ECU 50 is provided, and the diagnosis support ECU 40 controls the relay 55 corresponding to the ECU 50 to be diagnosed. Specifically, instead of S120 and S130 in FIG. 4, a predetermined signal is output to the relay 55 corresponding to the ECU 50 to be diagnosed. With this configuration, as indicated by a two-dot chain line in FIG. 3, a signal is output from the relay 55 to the power supply circuit 53 of the ECU 50, and power supply from the power supply circuit 53 to the CPU 51 is started. Thereby, although it is necessary to provide the relay 55 corresponding to each node in the communication network 10, the ECU 50 to be diagnosed can be shifted to the wake-up state by relatively simple control.

In this case, the relay 55 constitutes a “relay” in the claims.
(B) In the above embodiment, the diagnostic frame from the diagnostic device 20 is repeatedly transmitted. Therefore, when the diagnosis target ECU 50 is in the sleep state, no response is made to the diagnosis frame, and after the diagnosis support ECU 40 shifts to the wake-up state, the diagnosis target ECU 50 displays the diagnosis result for the diagnosis frame. respond.

  On the other hand, when the diagnosis target ECU 50 is in the sleep state, the diagnosis support ECU 40 may return a response frame (NAK) indicating that the ECU 50 cannot respond in place of the diagnosis target ECU 50. In this way, the diagnosis device 20 side can grasp that the ECU 50 to be diagnosed cannot respond because it is in the sleep state.

  Further, after the diagnosis target ECU 50 shifts from the sleep state to the wake-up state, the diagnosis support ECU 40 sends the frame transmitted by the diagnosis device 20 while the diagnosis target ECU 50 is in the sleep state to the ECU 50 instead of the diagnosis device 20. You may make it transmit. Thereby, as described above, it is not necessary for the diagnostic apparatus 20 to repeatedly output a diagnostic frame, and useless communication from the diagnostic apparatus 20 can be suppressed.

  DESCRIPTION OF SYMBOLS 1 ... Fault diagnosis system, 10 ... Communication network, 20 ... Diagnosis apparatus, 30 ... Diagnosis connector, 40 ... Diagnosis support ECU, 41 ... Frame reception part, 42 ... Reception ID determination part, 43 ... Diagnosis object ECU search part, 44 ... Frame transmission unit, 50 ... ECU, 51 ... CPU, 52 ... Transceiver, 53 ... Power supply circuit, 54 ... CAN controller, 55 ... Relay, 60 ... Bus communication path, 60 ... Communication bus

Claims (11)

Selective operation in which a plurality of nodes are connected to the same bus communication path, and the nodes are individually operated in either a sleep state in which some functions are stopped or a wake-up state in which a pre-assigned function can be executed. A communication network that can operate in wake-up mode;
A diagnostic device that is externally connected to the communication network, performs data communication with the node, and outputs a diagnostic request for responding a result of self-diagnosis to the node;
A fault diagnosis system comprising:
When the diagnostic request is output from the diagnostic device, the communication network searches for a node to be diagnosed included in the diagnostic request and causes the node to be diagnosed to shift to the wake-up state. And a relay for performing power supply control for shifting the node to the wake-up state, corresponding to each node.
The diagnosis support apparatus outputs the wake-up signal to the relay corresponding to the node to be diagnosed. The failure diagnosis system according to claim 1 ,
The diagnosis support apparatus searches for a node to be diagnosed, searches for a related node necessary for diagnosis of the node to be diagnosed, and outputs a wakeup signal for shifting the related node to the wakeup state. A fault diagnosis system characterized by Selective operation in which a plurality of nodes are connected to the same bus communication path, and the nodes are individually operated in either a sleep state in which some functions are stopped or a wake-up state in which a pre-assigned function can be executed. A communication network that can operate in wake-up mode;
A diagnostic device that is externally connected to the communication network, performs data communication with the node, and outputs a diagnostic request for responding a result of self-diagnosis to the node;
A fault diagnosis system comprising:
When the diagnostic request is output from the diagnostic device, the communication network searches for a node to be diagnosed included in the diagnostic request and causes the node to be diagnosed to shift to the wake-up state. includes a diagnosis support apparatus that outputs,
The diagnosis support apparatus searches for a node to be diagnosed, searches for a related node necessary for diagnosis of the node to be diagnosed, and outputs a wakeup signal for shifting the related node to the wakeup state. A fault diagnosis system characterized by The failure diagnosis system according to claim 3 ,
The node includes a signal processing unit that stops functioning in the sleep state, and a transceiver that operates in the sleep state.
The diagnosis support apparatus outputs a wakeup frame including an activation ID for shifting the diagnosis target node to the wakeup state to the bus communication path,
The fault diagnosis system, wherein the transceiver controls the power supply to the signal processing unit by determining the activation ID included in the wake-up frame. In the failure diagnosis system according to any one of claims 1 to 4,
The diagnosis support apparatus returns a response instead of the node when the node cannot respond to the diagnosis request from the diagnosis apparatus because the node is in the sleep state. Selective operation in which a plurality of nodes are connected to the same bus communication path, and the nodes are individually operated in either a sleep state in which some functions are stopped or a wake-up state in which a pre-assigned function can be executed. A communication network that can operate in wake-up mode;
A diagnostic device that is externally connected to the communication network, performs data communication with the node, and outputs a diagnostic request for responding a result of self-diagnosis to the node;
A fault diagnosis system comprising:
When the diagnostic request is output from the diagnostic device, the communication network searches for a node to be diagnosed included in the diagnostic request and causes the node to be diagnosed to shift to the wake-up state. includes a diagnosis support apparatus that outputs,
When the node cannot respond to the diagnosis request from the diagnosis device because the node is in the sleep state, the diagnosis support device returns a response instead of the node . The failure diagnosis system according to claim 6 ,
The node includes a signal processing unit that stops functioning in the sleep state, and a transceiver that operates in the sleep state.
The diagnosis support apparatus outputs a wakeup frame including an activation ID for shifting the diagnosis target node to the wakeup state to the bus communication path,
The fault diagnosis system, wherein the transceiver controls the power supply to the signal processing unit by determining the activation ID included in the wake-up frame. In the failure diagnosis system according to any one of claims 1 to 7 ,
The diagnosis support apparatus transmits a diagnosis request from the diagnosis apparatus to the node instead of the diagnosis apparatus when the node shifts from the sleep state to the wake-up state. Selective operation in which a plurality of nodes are connected to the same bus communication path, and the nodes are individually operated in either a sleep state in which some functions are stopped or a wake-up state in which a pre-assigned function can be executed. A communication network that can operate in wake-up mode;
A diagnostic device that is externally connected to the communication network, performs data communication with the node, and outputs a diagnostic request for responding a result of self-diagnosis to the node;
A fault diagnosis system comprising:
When the diagnostic request is output from the diagnostic device, the communication network searches for a node to be diagnosed included in the diagnostic request and causes the node to be diagnosed to shift to the wake-up state. includes a diagnosis support apparatus that outputs,
The diagnosis support apparatus transmits a diagnosis request from the diagnosis apparatus to the node instead of the diagnosis apparatus when the node shifts from the sleep state to the wake-up state . The failure diagnosis system according to claim 9 ,
The node includes a signal processing unit that stops functioning in the sleep state, and a transceiver that operates in the sleep state.
The diagnosis support apparatus outputs a wakeup frame including an activation ID for shifting the diagnosis target node to the wakeup state to the bus communication path,
The fault diagnosis system, wherein the transceiver controls the power supply to the signal processing unit by determining the activation ID included in the wake-up frame. The diagnosis assistance apparatus which comprises the failure diagnosis system as described in any one of Claims 1-10 .

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