WO2024100699A1 - Dispositif de communication, système de communication et procédé de diagnostic de signe de défaillance - Google Patents

Dispositif de communication, système de communication et procédé de diagnostic de signe de défaillance Download PDF

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Publication number
WO2024100699A1
WO2024100699A1 PCT/JP2022/041318 JP2022041318W WO2024100699A1 WO 2024100699 A1 WO2024100699 A1 WO 2024100699A1 JP 2022041318 W JP2022041318 W JP 2022041318W WO 2024100699 A1 WO2024100699 A1 WO 2024100699A1
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communication device
value data
circuit
setting value
data
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PCT/JP2022/041318
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English (en)
Japanese (ja)
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雅人 北
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日立Astemo株式会社
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Priority to PCT/JP2022/041318 priority Critical patent/WO2024100699A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters

Definitions

  • the present invention relates to a communication device, a communication system, and a method for predictive failure diagnosis, for example, in data communication via an in-vehicle network.
  • Patent Document 1 discloses a method for diagnosing failure signs by comparing setting data for adjusting the transmission waveform during communication with diagnostic criteria information.
  • Patent Document 1 Using the technology of Patent Document 1, for example, if a sign of failure is detected in a communication path in which a first communication device and a second communication device are connected by a transmission line, it is possible to know that the diagnosed communication path is in a state of a sign of failure. However, it is not possible to identify whether the part where the sign of failure is occurring is the first communication device, the second communication device, or the transmission line. As a result, not only is it time-consuming to perform maintenance to identify the actual part where the sign of failure is occurring, but if the part where the sign of failure is not identified, it will be necessary to preventively replace suspect parts or communication devices more than necessary, resulting in increased costs.
  • a communication device that transmits data signals, and includes a transmission circuit that transmits the data signals, a reception circuit that receives the data signals, and a set value data fluctuation diagnostic unit that uses first set value data that adjusts the transmission waveform when the data signal is transmitted and received via a transmission line with an external device, and second set value data that adjusts the transmission waveform when the data signal is looped back between the transmission circuit and the reception circuit, to determine, based on a predetermined determination condition, the fluctuation of the first set value data when the data signal is transmitted and received via a transmission line with an external device, and the fluctuation of the second set value data when the data signal is looped back between the transmission circuit and the reception circuit, and to diagnose a failure sign in the communication device and the transmission line based on the determination result.
  • FIG. 1 is a block diagram showing an example of an internal configuration of a communication device constituting a communication system according to a first embodiment of the present invention.
  • 5 is a diagram showing an example of a time-dependent change in setting value data for transmission waveform adjustment according to the first embodiment of the present invention;
  • FIG. 4 is a diagram showing a table in which failure sign diagnosis results for a single communication device according to the first embodiment of the present invention are classified into cases.
  • FIG. 4 is a diagram showing a table in which failure sign diagnosis results in two communication devices according to the first embodiment of the present invention are classified into cases.
  • 3 is a block diagram showing an example of an internal configuration of a communication device according to a first embodiment of the present invention, when the communication device includes a temperature detection unit; 3 is a block diagram showing an example of an internal configuration of a communication device according to a first embodiment of the present invention, when the communication device includes a power supply voltage detection unit; 1 is a diagram showing an example of a configuration in which information on a failure sign diagnosis result is collected in a higher-level device in a communication system according to a first embodiment of the present invention, and the higher-level device identifies a failure sign location.
  • FIG. 11 is a diagram showing an example of a configuration for identifying a failure symptom location by a communication device without using a higher-level device in a communication system according to a second embodiment of the present invention.
  • FIG. 11 is a diagram showing an example of a configuration for changing a determination threshold used in a failure sign diagnosis of a communication device in response to an instruction from an external device in a communication system according to a third embodiment of the present invention.
  • FIG. 11 is a diagram showing an example of a configuration in which an instruction from an external device is transmitted and received via wireless communication between two communication devices in a communication system according to a third embodiment of the present invention.
  • 1 is a block diagram showing an example of the hardware configuration of a communication device, a microcomputer, and a computer included in a server according to a first embodiment of the present invention;
  • Fig. 1 is a block diagram showing an example of the internal configuration of a communication device constituting a communication system according to a first embodiment.
  • a communication device 1 and a communication device 2 are connected by one transmission line 10.
  • the transmission line 10 is a pair of twisted pair cables (differential transmission path).
  • Full-duplex communication can be performed between the communication device 1 and the communication device 2 using the twisted pair cable.
  • the communication device 1 and the communication device 2 are used as in-vehicle Ethernet switches.
  • the transmission circuit is made up of a transmission processing circuit 101, an emphasis circuit 102, and a transmission output circuit 103, while the reception circuit is made up of a reception input circuit 104, an equalizer circuit 105, an error detection section 106, and a reception processing circuit 107.
  • the communication device 1 is equipped with an input/output section 108 and a set value data fluctuation diagnosis section 109 which diagnoses fluctuations in the set value data for adjusting the transmission waveform, the details of which will be described later.
  • the transmission processing circuit 101 converts data (e.g., IP packets) output from the input/output unit 108 into a signal suitable for transmission (called a "data signal"), and outputs the data signal to the emphasis circuit 102 via the signal line 11.
  • data signal e.g., IP packets
  • TX Transmission Processing circuit 101
  • the emphasis circuit 102 amplifies the high frequency band of the data signal input from the transmission processing circuit 101 according to the attenuation characteristics at high frequencies specific to the transmission path, and outputs the amplified signal to the transmission output circuit 103. This improves the frequency characteristics of the data signal received by the receiving communication device 2.
  • the emphasis circuit 102 also outputs setting value data 1 for the transmission waveform adjustment described below (an index of the tap coefficient value for adjusting the transmission waveform) to the setting value data fluctuation diagnosis unit 109 via the signal line 12.
  • the emphasis circuit 102 is realized by a compensation circuit that uses a frequency filter or the like that adjusts the frequency characteristics of the data signal to optimize them.
  • the transmission output circuit 103 amplifies the data signal input from the emphasis circuit 102 with a preset gain, and outputs the data signal to the input/output unit 108 via the signal line 13.
  • the input/output unit 108 performs a process of outputting the data signal input from the transmission output circuit 103 to the transmission line 10 (solid line).
  • the input/output unit 108 also receives a data signal from the communication device 2 via the transmission line 10 (dashed line).
  • the input/output unit 108 outputs the data signal input from the transmission output circuit 103 during loopback to the reception input circuit 104 via signal line 14 (dash-dotted line).
  • the input/output unit 208 outputs the data signal input from the transmission output circuit 203 during loopback to the reception input circuit 204 via signal line 24 (dash-dotted line).
  • the receiving input circuit 104 amplifies the data signal input from the input/output unit 108 with a preset gain and outputs the data signal to the equalizer circuit 105.
  • the equalizer circuit 105 After receiving a data signal from the receiving input circuit 104, the equalizer circuit 105 adjusts the frequency characteristics of the data signal to restore the signal waveform that has been altered by the characteristics of the transmission line and to minimize the changes, and outputs the data signal to the error detection unit 106.
  • the equalizer circuit 105 also outputs setting value data 2 for the transmission waveform adjustment (which is an index of the tap coefficient value for adjusting the transmission waveform) to the setting value data fluctuation diagnosis unit 109 via the signal line 15, which will be described later.
  • the equalizer circuit 105 is realized by a compensation circuit that uses a frequency filter or the like that adjusts the frequency characteristics of the data signal to optimize them. In many cases, the high frequency band is amplified in order to compensate for the lost high frequency components of the signal sent from the transmission line.
  • the error detection unit 106 compares the data signal input from the equalizer circuit 105 with a predetermined data signal to detect errors, and outputs the error detection result together with the data signal to the reception processing circuit 107.
  • the receiving processing circuit 107 receives the data signal and the error detection result, and converts the data signal into data suitable for use in a downstream processing block or device (not shown). In the figure, the receiving processing circuit 107 is indicated as "RX.”
  • the set value data variation diagnostic unit 109 monitors the variations of the transmission waveform adjustment set value data 1 obtained from the emphasis circuit 102 and the transmission waveform adjustment set value data 2 obtained from the equalizer circuit 105, and diagnoses signs of failure in the communication device and transmission line.
  • the set value data variation diagnostic unit 109 outputs the results of the diagnosis of signs of failure to a device external to the communication device 1 via the signal line 16.
  • the transmission circuit is made up of a transmission processing circuit 201, an emphasis circuit 202, and a transmission output circuit 203
  • the reception circuit is made up of a reception input circuit 204, an equalizer circuit 205, an error detection unit 206, and a reception processing circuit 207.
  • the communication device 2 is equipped with an input/output unit 208 and a setting value data fluctuation diagnosis unit 209, the details of which will be described later.
  • the transmission processing circuit 201, emphasis circuit 202, and transmission output circuit 203 constituting the transmission circuit have the same configuration as the transmission processing circuit 101, emphasis circuit 102, and transmission output circuit 103 of the communication device 1.
  • the reception input circuit 204, equalizer circuit 205, error detection unit 206, and reception processing circuit 207 constituting the reception circuit have the same configuration as the reception input circuit 104, equalizer circuit 105, error detection unit 106, and reception processing circuit 107 of the communication device 1.
  • the input/output unit 208 and setting value data fluctuation diagnosis unit 209 have the same configuration as the input/output unit 108 and setting value data fluctuation diagnosis unit 109 of the communication device 1. A description of these processing blocks of the communication device 2 will be omitted.
  • the signal lines 21 to 26 correspond to the signal lines 11 to 16 of the communication device 1.
  • communication device 1 and communication device 2 are affected by the frequency characteristics of transmission line 10, so they adjust the transmission waveform.
  • the circuits that perform this adjustment function are emphasis circuits 102 and 202 on the transmitting side, and equalizer circuits 105 and 205 on the receiving side.
  • the emphasis circuits 102, 202 are, for example, Finite Impulse Response (FIR) type digital filters (frequency filters).
  • FIR filter Finite Impulse Response
  • the transmission waveform can be adjusted using three tap coefficients.
  • tap coefficients will also be simply referred to as "coefficients.”
  • the equalizer circuits 105 and 205 are, for example, decision feedback equalizers (DFEs) that use digital filters (frequency filters).
  • DFEs decision feedback equalizers
  • a DFE for example, if the transfer function has three taps, the transmission waveform can be adjusted using three tap coefficients.
  • setting value data for transmission waveform adjustment the values obtained by indexing the tap coefficients used to adjust the transmission waveform are referred to as "setting value data for transmission waveform adjustment.”
  • setting value data for transmission waveform adjustment may be abbreviated to “setting value data.”
  • at least changes in either the setting value data for the emphasis circuit or the setting value data for the equalizer circuit are monitored to detect signs of failure.
  • the absolute value of the rate of change from the initial value is maximum when coefficient a0 is -50.0% and the maximum value is 50%.
  • the indexed value is -50.
  • the percentage value is normalized to 0 to 100.
  • the setting value data for the transmission waveform adjustment (the indexed value of the tap coefficient value for adjusting the transmission waveform) tends to change more from the initial value as the communication devices 1, 2 and the transmission line 10 deteriorate. Therefore, the setting value data fluctuation diagnosis unit 109 can diagnose signs of failure by monitoring fluctuations in the setting value data for the transmission waveform adjustment.
  • an allowable range for the three coefficients may be determined, and the margin to the allowable range may be an index value obtained by indexing the minimum value of the three coefficients, or an index value obtained by indexing each of the three coefficients individually.
  • a0 and a2 generate an undershoot waveform and play an important role in adjusting the transmission waveform, so the coefficients may be weighted and indexed.
  • the FIR filter and DFE mentioned above are examples of emphasis circuits and equalizer circuits used to adjust the transmission waveform, and are not limited to this circuit type, but also include analog signal processing circuits. Also, the number of taps is not limited to three, and if the number of taps is N, the transmission waveform can be adjusted with N coefficients.
  • the set value data for the transmission waveform adjustment is determined before data signals are transmitted or received. For example, transmission and reception is repeated between communication device 1 and communication device 2 using a predetermined signal pattern, and the set value data for the transmission waveform adjustment is determined so as to achieve optimal conditions that result in zero errors in error detection units 106 and 206.
  • a method for diagnosing signs of failure in a communication path using the set value data for the transmission waveform adjustment during normal transmission and reception is known from Patent Document 1.
  • the present invention performs failure sign diagnosis using setting value data 1 for adjusting the transmission waveform during normal transmission and reception (referred to as “setting value data 1" to distinguish it from setting value data 1) and setting value data 2 for adjusting the transmission waveform during loopback from the transmitting circuit to the receiving circuit within the same communication device (referred to as “setting value data 2" to distinguish it from setting value data 1).
  • setting value data 1 for adjusting the transmission waveform during normal transmission and reception
  • setting value data 2 for adjusting the transmission waveform during loopback from the transmitting circuit to the receiving circuit within the same communication device
  • the present invention makes it possible to identify the location of the failure sign (communication device 1 or communication device 2 or transmission line 10) by using the diagnosis results of transmission and reception between communication device 1 and communication device 2.
  • a failure sign diagnosis during normal transmission and reception determines that there is a failure sign in "Communication device 2 transmission" ⁇ "Transmission line 10" ⁇ "Communication device 1 reception,” it will be possible to determine that there is an abnormality in this communication path, but it will not be possible to identify the location of the failure sign. Therefore, in this invention, by adding a failure sign diagnosis during loopback, self-diagnosis result information can be obtained for each of communication device 1 and communication device 2, making it possible to identify the location of the failure sign. If there is a response of normal reception from the communication device at the transmission destination (e.g., communication device 1), it can be confirmed that the communication is normal. The presence or absence of a response from the communication partner is confirmed by the communication device that sent the data signal or by a higher-level device, which will be described later.
  • the signal path when looping back within the same communication device is, for example, in the case of communication device 1, "transmission processing circuit 101" ⁇ "emphasis circuit 102” ⁇ “transmission output circuit 103” ⁇ “signal line 13" ⁇ “input/output unit 108” ⁇ "signal line 14" ⁇ "reception input circuit 104" ⁇ "equalizer circuit 105" ⁇ "error detection unit 106".
  • the setting value data 2 for adjusting the transmission waveform is determined so as to achieve the optimal condition where the error detection unit 106 of the communication device 1 detects zero errors. The same is true for the communication device 2, so a description thereof will be omitted.
  • the communication path does not include the transmission line 10, so there is less distortion in the transmission waveform. For this reason, it is more effective to adjust the transmission waveform in the emphasis circuit 102 and the equalizer circuit 105 under different settings than those used during normal transmission and reception.
  • the tap coefficients of the transfer function in the emphasis circuit 102 are set to reduce the signal amplitude.
  • the gain for the entire signal in the transmission output circuit 103 or the gain for the entire signal in the reception input circuit 104 can be adjusted to reduce the signal amplitude.
  • a signal pattern that is prone to errors such as only one Hi level during successive Lo levels, or conversely, only one Lo level during successive Hi levels, is considered to be more suitable for capturing changes as a failure sign diagnosis.
  • errors are more likely to be detected by the error detection unit 106.
  • Another diagnostic pattern that is prone to errors is one in which the signal frequency is increased and the interval on the time axis is narrowed.
  • an echo canceller circuit (not shown) is installed to remove the transmission signal contained in the received signal. If this echo canceller function works during loopback and removes the looped-back signal, it is necessary to take measures such as disabling the echo canceller function.
  • a circuit for disabling the echo canceller function is provided at least before the equalizer circuit 105, such as between the input/output unit 108 and the receiving input circuit 104.
  • the communication device 1 is affected by the reflection of the electrical signal by the connected transmission line 10, or by the data signal received from communication device 2.
  • a method may be considered in which the input/output unit 108 is provided with a function for disconnecting the connection to the transmission line 10 using a switch circuit or the like, and a failure sign diagnosis during loopback is performed with the transmission line 10 disconnected.
  • failure sign diagnosis must be performed at a timing that does not interfere with normal communication.
  • the transmission waveform adjustment setting value data fluctuation diagnosis unit 109 diagnoses signs of failure using transmission waveform adjustment setting value data 1 and setting value data 2, which are indexes of the tap coefficients of the transfer functions of the emphasis circuit 102 and the equalizer circuit 105.
  • FIG. 2 is a diagram showing an example of a time-dependent change in the setting data for the transmission waveform adjustment according to the present embodiment, in which the horizontal axis represents time and the vertical axis represents the setting data for the transmission waveform adjustment, and a determination is made based on a plurality of threshold values.
  • the setting data fluctuation diagnostic unit 109 judges fluctuations in the setting data (signs of failure) based on the relationship between the setting data for transmission waveform adjustment and the thresholds (TH-U1, TH-U2, TH-U3, TH-D1, TH-D2, TH-D3).
  • the relationship between the upper thresholds is TH-U1 ⁇ TH-U2 ⁇ TH-U3, and the relationship between the lower thresholds is TH-D1>TH-D2>TH-D3.
  • the value of the set value data for the transmission waveform adjustment fluctuates upward over time.
  • the simplest diagnostic method in which exceeding the upper threshold TH-U3 is determined to be a sign of failure, would be to simply determine that a sign of failure exists when the value of the set value data for the transmission waveform adjustment exceeds threshold TH-U3. Note that a sign of failure is also determined when the value of the set value data for the transmission waveform adjustment falls below the lower threshold TH-D3.
  • the time until a failure symptom (here, threshold value TH-U3) can be predicted based on the time exceeded by threshold value TH-U1 or the time exceeded by threshold value TH-U2. That is, the time at which the set value data for the transmission waveform adjustment reaches threshold value TH-U3 can be determined by the time that has elapsed since the data exceeded threshold value TH-U1 until it exceeded threshold value TH-U2.
  • the condition of the failure symptom (the rate at which component deterioration progresses) can also be inferred from the time that has elapsed from threshold value TH-U1 to threshold value TH-U3, or from threshold value TH-U2 to threshold value TH-U3.
  • the condition of the failure symptom may be inferred by comparing the time that has elapsed from threshold value TH-U1 to threshold value TH-U3 with the time that has elapsed from threshold value TH-U2 to threshold value TH-U3.
  • the time until a failure symptom occurs by acquiring the setting value data for the transmission waveform adjustment in a time series without using multiple thresholds.
  • at least one threshold e.g., threshold TH-U3
  • the time at which threshold TH-U3 is reached can be estimated from the slope or degree of the upward curve of the data (time series data) of the setting value data for the transmission waveform adjustment acquired in a time series.
  • a judgment using multiple thresholds has the advantage of requiring less data than a judgment using time series data.
  • the acquired transmission waveform adjustment setting value data can be used to diagnose signs of failure using statistical methods or machine learning.
  • the procedure for failure sign diagnosis in the setting value data variation diagnosis unit 109 will be described. For example, a case where failure sign diagnosis is performed at startup in the communication device 1 will be described as an example.
  • the communication device 1 performs failure sign diagnosis during loopback, and checks by self-diagnosis whether there is a problem with the communication device 1 itself.
  • the communication device 1 performs failure sign diagnosis during normal transmission and reception.
  • the setting value data variation diagnosis unit 109 acquires the following four patterns of setting value data for transmission waveform adjustment.
  • Setting value data 2 for adjusting the transmission waveform of the emphasis circuit 102 during loopback (2) Setting value data 2 for adjusting the transmission waveform of the equalizer circuit 105 during loopback (3) Setting value data 1 for adjusting the transmission waveform of the emphasis circuit 102 during normal transmission and reception (4) Setting value data 1 for adjusting the transmission waveform of the equalizer circuit 105 during normal transmission and reception
  • the set value data variation diagnostic unit 109 performs a failure sign diagnosis on the set value data for each of the transmission waveform adjustments (1) to (4) above, based on a predetermined judgment condition. If the set value data variation diagnostic unit 109 judges that there is a failure sign, it outputs a failure sign signal from the signal line 16 to a device external to the communication device 1.
  • FIG. Fig. 3 is a diagram showing a table dividing the results of a failure sign diagnosis for a single communication device 1.
  • Table 3 dividing the cases shown in Fig. 3 has the following items: "No.”, "Communication device 1 ⁇ 2 (normal)", “Communication device 1 (loopback)", “Communication device 2 ⁇ 1 (normal)", and "Failure sign location”.
  • “No.” is an identifier (for example, a number) for uniquely identifying a row (record) in the table.
  • "Communication device 1 ⁇ 2 (normal)” indicates a normal communication state in which a data signal is transmitted from communication device 1 to communication device 2. In the figure, “ ⁇ ” indicates normality, and “X” indicates a failure precursor state.
  • “Communication device 1 (loopback)” indicates the communication state when loopback is performed in communication device 1.
  • “Communication device 2 ⁇ 1 (normal)” indicates a normal communication state in which a data signal is transmitted from communication device 2 to communication device 1. In the figure, “ ⁇ ” indicates normality, and “X” indicates a failure precursor state.
  • the "failure symptom location” indicates a failure symptom location identified from the communication states shown as “communication device 1 ⁇ 2 (normal)", “communication device 1 (loopback)", and “communication device 2 ⁇ 1 (normal)”.
  • diagnosis of signs of failure from "communication device 1 (loopback)". If “communication device 1 (loopback)" is in a state of signs of failure, it can be determined that there are signs of failure in communication device 1 regardless of the results of the diagnosis of "communication device 1 ⁇ 2 (normal)” and “communication device 2 ⁇ 1 (normal)” (see No. 1, No. 2, No. 5, No. 6). In this way, the diagnosis of "communication device 1 ⁇ 2 (normal)” and “communication device 2 ⁇ 1 (normal)” can be omitted.
  • the communication device of this embodiment is a communication device that transmits data signals, and includes a transmission circuit (transmission processing circuit 101 to transmission output circuit 103) that transmits the data signals, a reception circuit (reception input circuit 104 to reception processing circuit 107) that receives the data signals, and a setting value data fluctuation diagnosis unit (setting value data fluctuation diagnosis unit 109).
  • the setting value data fluctuation diagnosis unit is configured to use first setting value data for adjusting the transmission waveform when a data signal is transmitted and received with an external device (e.g., communication device 2) via a transmission line (communication device 1 ⁇ 2 (normal), communication device 2 ⁇ 1 (normal)) and second setting value data for adjusting the transmission waveform when the data signal is looped back between the transmitting circuit and the receiving circuit (communication device 1 (loopback)) based on predetermined judgment conditions to judge the fluctuation of the first setting value data when a data signal is transmitted and received with an external device via the transmission line and the fluctuation of the second setting value data when the data signal is looped back between the transmitting circuit and the receiving circuit, and to diagnose signs of failure in the communication device and the transmission line based on the judgment results.
  • an external device e.g., communication device 2
  • second setting value data for adjusting the transmission waveform when the data signal is looped back between the transmitting circuit and the receiving circuit based on predetermined judgment conditions to judge the fluctuation of the
  • the communication device e.g., communication device 1
  • an external device e.g., communication device 2
  • diagnose signs of failure based on the setting value data for transmission waveform adjustment under different conditions.
  • This enables the communication device itself to perform self-diagnosis, improving the accuracy of diagnosis of signs of failure.
  • it is possible to know whether the communication device to be diagnosed e.g., communication device 1) is in a state of signs of failure.
  • FIG. 4 is a diagram showing a table in which the failure sign diagnosis results in two communication devices 1 and 2 are classified into cases.
  • the example in FIG. 4 is an example of a case in which a failure sign location is specified using the failure sign diagnosis results of the communication device 1 alone and the communication device 2 alone.
  • an item of "communication device 2 (loopback)" is added to the case classification table 4 shown in FIG. 4.
  • the case classification table 4 has the items of "No.”, "communication device 1 ⁇ 2 (normal)”, “communication device 1 (loopback)”, “communication device 2 ⁇ 1 (normal)”, “communication device 2 (loopback)", and "failure sign location”.
  • the failure sign diagnosis result for "No. 3" in Table 3 shown in FIG. 3 corresponds to the failure sign diagnosis results for "No. 5" and “No. 6” in Table 4 in FIG. 4.
  • “No. 5" in Table 4 if "communication device 1 ⁇ 2 (normal)” is in a failure sign state, “communication device 1 (loopback)” is normal, and “communication device 2 ⁇ 1 (normal)” is in a failure sign state, and “communication device 2 (loopback)” is in a failure sign state, communication device 2 can be identified as the failure sign location.
  • “No. 5" in Table 4 if "communication device 1 ⁇ 2 (normal)” is in a failure sign state, “communication device 1 (loopback)” is normal, and “communication device 2 ⁇ 1 (normal)” is in a failure sign state, and “communication device 2 (loopback)” is in a failure sign state, communication device 2 can be identified as the failure sign location.
  • “No. 5" in Table 4 if “communication device 1 ⁇
  • transmission line 10 can be identified as the failure sign location.
  • the failure sign diagnosis result in “No. 4" in Table 3 shown in FIG. 3 corresponds to the failure sign diagnosis result in "No. 7" and “No. 8” in Table 4 in FIG. 4.
  • “No. 7” in Table 4 if "communication device 1 ⁇ 2 (normal)” is in a failure sign state, “communication device 1 (loopback)” is normal, and “communication device 2 ⁇ 1 (normal)” is normal, and “communication device 2 (loopback)” is in a failure sign state, communication device 2 can be identified as the failure sign location.
  • “No. 7” in Table 4 if “communication device 1 ⁇ 2 (normal)” is in a failure sign state, “communication device 1 (loopback)” is normal, and “communication device 2 ⁇ 1 (normal)” is normal, and “communication device 2 (loopback)” is in a failure sign state, communication device 2 can be identified as the failure sign location.
  • “No. 7” in Table 4 if “communication device 1 ⁇ 2 (normal)” is in a failure
  • the failure sign diagnosis result in “No. 7" in Table 3 shown in FIG. 3 corresponds to the failure sign diagnosis result in "No. 13" and “No. 14" in Table 4 in FIG. 4.
  • “No. 13” in Table 4 if "communication device 1 ⁇ 2 (normal)” is normal, “communication device 1 (loopback)” is normal, and “communication device 2 ⁇ 1 (normal)” is in a failure sign state, and "communication device 2 (loopback)" is in a failure sign state, communication device 2 can be identified as the failure sign location.
  • “No. 13” in Table 4 if “communication device 1 ⁇ 2 (normal)” is normal, “communication device 1 (loopback)” is normal, and “communication device 2 ⁇ 1 (normal)” is in a failure sign state, and “communication device 2 (loopback)” is in a failure sign state, communication device 2 can be identified as the failure sign location.
  • “No. 13” in Table 4 if “communication device 1 ⁇ 2 (normal)” is normal, “communication
  • transmission line 10 can be identified as the failure sign location.
  • diagnosis of the communication state i.e., diagnosis of signs of failure, should be performed from “communication device 1 (loopback)" and "communication device 2 (loopback)".
  • the communication system is a communication system including a first communication device (e.g., communication device 1) and a second communication device (e.g., communication device 2) that transmit data signals.
  • Each of the first communication device and the second communication device includes a transmission circuit (transmission processing circuit 101 to transmission output circuit 103, transmission processing circuit 201 to transmission output circuit 203) that transmits the data signal, a reception circuit (reception input circuit 104 to reception processing circuit 107, reception input circuit 204 to reception processing circuit 207) that receives the data signal, and a setting value data fluctuation diagnosis unit (setting value data fluctuation diagnosis unit 109, 209).
  • the set value data fluctuation diagnostic unit uses first set value data for adjusting a transmission waveform when a data signal is transmitted and received between a first communication device and a second communication device via a transmission line (communication device 1 ⁇ 2 (normal), communication device 2 ⁇ 1 (normal)), second set value data for adjusting a transmission waveform when a loopback is performed between a transmission circuit and a reception circuit in the first communication device (communication device 1 (loopback)), and third set value data for adjusting a transmission waveform when a loopback is performed between a transmission circuit and a reception circuit in the second communication device (communication device 2 (loopback)).
  • the system is configured to determine, based on predetermined determination conditions, a fluctuation in first setting value data when a data signal is transmitted and received between the first communication device and the second communication device via the transmission line, a fluctuation in second setting value data when a loopback is performed between the transmitting circuit and the receiving circuit in the first communication device, and a fluctuation in third setting value data when a loopback is performed between the transmitting circuit and the receiving circuit in the second communication device, and to diagnose signs of failure in the first communication device, the second communication device, and the transmission line based on the determination results, and to identify locations having signs of failure.
  • a diagnosis is performed when transmitting and receiving between two communication devices (for example, communication devices 1 and 2) via a transmission line, and a diagnosis is also performed when looping back in each communication device. This allows the location of the potential failure to be identified as being in either the communication device or the transmission line.
  • FIG. 5 is a block diagram showing an example of an internal configuration of a communication device according to the present embodiment, in which a temperature detection unit (temperature detection circuit) is provided.
  • a temperature detection unit temperature detection circuit
  • This example is an example in which the influence of the temperature of the communication device is taken into consideration in failure sign diagnosis.
  • the communication device 1 and the communication device 2 shown in FIG. 1 each include a temperature detection unit 111 and a temperature detection unit 211 that detect the temperature inside the communication device.
  • the set value data fluctuation diagnosis units 109 and 209 change the judgment threshold for the failure sign diagnosis according to the temperature inside the communication device 1 and 2 detected by the temperature detection units 111 and 211. This makes it possible to prevent the set value data that adjusts the transmission waveform of the data signal from being erroneously judged as a failure sign state when it changes due to the influence of temperature.
  • One possible method for changing the threshold according to temperature is, for example, to measure the temperature dependency of the set value data during product shipping inspection and store threshold information corresponding to the temperature inside the communication device.
  • FIG. 6 is a block diagram showing an example of the internal configuration of a communication device according to the present embodiment, which includes a power supply voltage detection unit (power supply voltage detection circuit).
  • a power supply voltage detection unit power supply voltage detection circuit
  • Communication device 1 and communication device 2 shown in FIG. 1 each include a power supply voltage detection unit 112 and a power supply voltage detection unit 212.
  • the set value data variation diagnosis units 109 and 209 change the judgment threshold for failure sign diagnosis according to the power supply voltage supplied to communication devices 1 and 2 detected by the power supply voltage detection units 112 and 212. This makes it possible to prevent the set value data that adjusts the transmission waveform of the data signal from being erroneously determined to be in a failure sign state when it changes due to the influence of the power supply voltage.
  • One possible method for changing the threshold according to the power supply voltage is, for example, to measure the power supply voltage dependency of the set value data during product shipping inspection and store threshold information corresponding to the power supply voltage.
  • FIG. 7 is a diagram showing an example of a configuration in a communication system in which information on the results of failure sign diagnosis is collected in a higher-level device and the higher-level device identifies the location of the failure sign.
  • FIG. 7 shows an example of a configuration in which information on the results of failure sign diagnosis by the setting value data variation diagnosis units 109, 209 of communication device 1 and communication device 2 is collected in the higher-level device 300, and the higher-level device 300 identifies communication devices and transmission lines that have a location of the failure sign.
  • electronic control device 100 equipped with communication device 1 further includes communication device 3, and electronic control device 200 equipped with communication device 2 further includes communication device 5.
  • communication device 1 and communication device 3 are connected via signal line 16.
  • communication device 2 and communication device 5 are connected via signal line 26.
  • Communication device 3 may have the same configuration as communication device 1, or may have a configuration that does not include the setting value data fluctuation diagnosis unit 109 of communication device 1.
  • communication device 5 may have the same configuration as communication device 2, or may have a configuration that does not include the setting value data fluctuation diagnosis unit 209 of communication device 2.
  • the higher-level device 300 includes a communication device 4, a communication device 6, and a microcomputer 310 that identifies the location of the failure sign based on the failure sign diagnosis result.
  • the communication device 3 of the electronic control device 100 and the communication device 4 of the higher-level device 300 are connected by a transmission line 30.
  • the communication device 5 of the electronic control device 200 and the communication device 6 of the higher-level device 300 are connected by a transmission line 50.
  • the communication device 4 may have the same configuration as the communication device 1, or may have a configuration that does not include the setting value data fluctuation diagnosis unit 109 of the communication device 1.
  • the communication device 6 may have the same configuration as the communication device 2, or may have a configuration that does not include the setting value data fluctuation diagnosis unit 209 of the communication device 2.
  • the failure sign diagnosis result of communication device 1 is sent from signal line 16 via communication device 3, transmission line 30, and communication device 4 to microcomputer 310. That is, the failure sign diagnosis result of communication device 1 is sent from the set value data fluctuation diagnosis unit 109 to the transmission processing circuit 101 of communication device 3 via signal line 16. Then, by normal data communication, the failure sign diagnosis result is sent from the input/output unit 108 of communication device 3 to the input/output unit 108 of communication device 4 via transmission line 30. Furthermore, the failure sign diagnosis result is sent from the receiving processing circuit 107 of communication device 4 to the microcomputer 310.
  • the failure sign diagnosis result of communication device 2 is sent from signal line 26 to microcomputer 310 via communication device 5, transmission line 50, and communication device 6.
  • the specific communication path by which the failure sign diagnosis result of communication device 2 is sent from signal line 26 to microcomputer 310 via communication device 5, transmission line 50, and communication device 6 is the same as the communication path for the failure sign diagnosis result of communication device 1 described above, so a detailed description will be omitted.
  • the microcomputer 310 based on the results of the failure sign diagnosis of the communication device 1 and the failure sign diagnosis of the communication device 2, the locations of the failure signs of the communication device 1, the communication device 2, and the transmission line 10 are identified.
  • the setting value data for the transmission waveform adjustment of the emphasis circuit 102 and the equalizer circuit 105 of the communication device 1 and the setting value data for the transmission waveform adjustment of the emphasis circuit 202 and the equalizer circuit 205 of the communication device 2 may be transmitted to the higher-level device 300.
  • the microcomputer 310 of the higher-level device 300 can also aggregate the setting value data for each circuit transmitted by the communication device 1 and the setting value data for each circuit transmitted by the communication device 2, and perform failure sign diagnosis and identify the location of the failure sign.
  • the higher-level device 300 corresponds to an integrated ECU that provides integrated control of these ECUs.
  • the communication system is a communication system including a first communication device (e.g., communication device 1) and a second communication device (e.g., communication device 2) that transmit data signals, and an information processing device (higher-level device 300).
  • Each of the first communication device and the second communication device includes a transmission circuit (transmission processing circuit 101 to transmission output circuit 103, transmission processing circuit 201 to transmission output circuit 203) for transmitting a data signal,
  • the device includes receiving circuits (receiving input circuit 104 to receiving processing circuit 107, receiving input circuit 204 to receiving processing circuit 207) that receive data signals, and setting value data fluctuation diagnostic units (setting value data fluctuation diagnostic units 109, 209).
  • the set value data variation diagnosis unit is configured to use first set value data for adjusting a transmission waveform when a data signal is transmitted and received between the first communication device and the second communication device via the transmission line (communication device 1 ⁇ 2 (normal), communication device 2 ⁇ 1 (normal)), second set value data for adjusting a transmission waveform when a loopback is performed between a transmitting circuit and a receiving circuit in the first communication device (communication device 1 (loopback)), and third set value data for adjusting a transmission waveform when a loopback is performed between a transmitting circuit and a receiving circuit in the second communication device (communication device 2 (loopback)), based on a predetermined judgment condition, to respectively judge a variation of the first set value data when a data signal is transmitted and received between the first communication device and the second communication device via the transmission line, a variation of the second set value data when a loopback is performed between the transmitting circuit and the receiving circuit in the first communication device, and a variation of the third set value data when a loopback is performed between the transmit
  • the results of failure sign diagnosis by multiple communication devices can be aggregated in an external information processing device, and the location of the failure sign can be identified by the information processing device. Therefore, the location of the failure sign can be identified by an information processing device with a higher data processing capacity than the communication devices.
  • the second embodiment is an example in which a communication device identifies a location of a failure sign without using a higher-level device, in contrast to the communication system according to the first embodiment (see FIG. 7).
  • the second embodiment will be described with reference to FIG.
  • FIG. 8 is a diagram showing an example of a configuration for identifying a failure symptom location by a communication device without using a higher-level device in a communication system according to this embodiment.
  • a signal line 17 connecting the transmission processing circuit 101 and the set value data variation diagnosis unit 109, and a signal line 18 connecting the reception processing circuit 107 and the set value data variation diagnosis unit 109 are added to the communication device 1 (see FIG. 1) described above.
  • a signal line 27 connecting the transmission processing circuit 201 and the set value data variation diagnosis unit 209, and a signal line 28 connecting the reception processing circuit 207 and the set value data variation diagnosis unit 209 are added to the communication device 2.
  • they are referred to as communication device 1A and communication device 2A.
  • the failure sign diagnosis result of the set value data variation diagnosis unit 109 is sent to the transmission processing circuit 101 via signal line 17, and is then transmitted to communication device 2A by normal data communication.
  • the failure sign diagnosis result of communication device 1A that has arrived at communication device 2A is sent from the reception processing circuit 207 via signal line 28 to the set value data variation diagnosis unit 209.
  • the failure sign diagnosis results of communication device 1A and communication device 2A are aggregated in the set value data variation diagnosis unit 209, so that the locations of the failure signs in communication device 1A, communication device 2A, and transmission line 10 can be identified.
  • the failure sign diagnosis result of the set value data variation diagnosis unit 209 is sent to the transmission processing circuit 201 via signal line 27, and is transmitted to communication device 1A by normal data communication.
  • the failure sign diagnosis result of communication device 2A that has arrived at communication device 1A is sent from the reception processing circuit 107 to the set value data variation diagnosis unit 109 via signal line 18.
  • the set value data variation diagnosis unit 109 aggregates the failure sign diagnosis results of communication device 1A and communication device 2A, so that it is possible to identify the failure sign locations of communication device 1A, communication device 2A, and transmission line 10.
  • the result of identifying the failure sign location in communication device 1A is output to a device external to communication device 1A via signal line 16.
  • the result of identifying the failure sign location in communication device 2A is output to a device external to communication device 2A via signal line 26.
  • the third embodiment is an example in which a determination threshold used in a failure sign diagnosis of a communication device is changed in response to an instruction from an external device.
  • FIG. 9 is a diagram showing an example of a configuration for changing a determination threshold used in a failure sign diagnosis of a communication device in response to an instruction from an external device in the communication system according to this embodiment.
  • FIG. 10 is a diagram showing an example of a configuration in which an instruction from an external device is transmitted and received between two communication devices via wireless communication in a communication system according to this embodiment.
  • communication device 1B includes a signal line T1 that connects transmission processing circuit 101 to an external device, and a signal line R1 that connects reception processing circuit 107 to an external device in addition to communication device 1A described above (see FIG. 8).
  • communication device 2B includes a signal line T2 that connects transmission processing circuit 201 to an external device, and a signal line R2 that connects reception processing circuit 207 to an external device in addition to communication device 2A described above.
  • signal line 16 that was present in communication device 1A and that outputs a failure sign diagnosis result from set value data variation diagnosis unit 109 is deleted, and the failure sign diagnosis result is output from signal line R1 via signal line 18 and reception processing circuit 107.
  • signal line 26 that was present in communication device 2A and that outputs a failure sign diagnosis result from set value data variation diagnosis unit 209 is deleted, and the failure sign diagnosis result is output from signal line R2 via signal line 28 and reception processing circuit 207.
  • electronic control device 100B is capable of transmitting and receiving data signals to and from electronic control device 200B via transmission line 10.
  • Electronic control device 100B is also capable of transmitting and receiving data signals to and from server 400 (an example of an external device) using wireless communication.
  • Electronic control device 200B has a wired communication function, but may have the same configuration as electronic control device 100B having a wireless communication function.
  • instruction data from an external device received by an antenna 130 installed in the electronic control device 100B is sent via the wireless communication module 120 to the microcomputer 110 that controls the electronic control device 100B.
  • the instruction data from the external device includes information for changing the judgment threshold for the failure sign diagnosis.
  • the instruction data from the external device is sent from the microcomputer 110 to the transmission processing circuit 101 of the communication device 1B via signal line T1.
  • the instruction data is delivered from the transmission processing circuit 101 to the setting value data variation diagnosis unit 109 via signal line 17. Therefore, the setting value data variation diagnosis unit 109 can change the judgment threshold for the failure sign diagnosis in response to an instruction from the external device.
  • the set value data variation diagnosis unit 209 can change the judgment threshold for the failure sign diagnosis in response to an instruction from the external device.
  • the set value data variation diagnosis unit 109, 209 can obtain instructions from an external device via a communication network using wireless communication, and change the threshold value for failure sign diagnosis based on the instructions from the external device.
  • the set value data variation diagnosis unit 109, 209 in the communication device can obtain information on the occurrence of failures in the same vehicle model as an instruction from the external device, and can improve the accuracy of failure sign diagnosis by changing the judgment conditions based on the information on the occurrence of failures.
  • changing the judgment conditions means changing the threshold value as shown in Figure 2.
  • one possible measure is to reduce the value of the threshold value TH-U3 to bring it closer to the threshold value TH-U2.
  • the server 400 can perform failure sign diagnosis using the transmitted failure sign diagnosis results and the setting value data for the transmission waveform adjustment.
  • the server 400 can also send the obtained failure sign diagnosis results back to electronic control devices 100B, 200B (communication devices 1B, 2B) by wireless communication.
  • the wireless communication formed by the wireless communication module 120 and antenna 130 corresponds to OTA (Over the Air).
  • the external device may be a maintenance terminal used by a mechanic for maintenance.
  • the mechanic operates the maintenance terminal to send an instruction to change the threshold value for the failure sign diagnosis to the communication devices 1B, 2B of the electronic control devices 100B, 200B.
  • FIG. 11 is a block diagram showing an example of the hardware configuration of a computer provided in a communication device, a microcomputer, and a server according to each embodiment of the present invention.
  • the calculator 500 shown in FIG. 11 is hardware used as a so-called computer.
  • the computer 500 includes a CPU (Central Processing Unit) 501, a ROM (Read Only Memory) 502, a RAM (Random Access Memory) 503, non-volatile storage 506, and a network interface 507, each of which is connected to a bus.
  • CPU Central Processing Unit
  • ROM Read Only Memory
  • RAM Random Access Memory
  • CPU 501 is an example of a processor as a computing device.
  • ROM 502 and RAM 503 are examples of memory.
  • the non-volatile storage 506 is a non-volatile storage element with a larger capacity than a memory.
  • a program that realizes the functions of the communication device according to each embodiment of the present invention is stored in the non-volatile storage 506.
  • This non-volatile storage 506 is an example of a computer-readable non-transient recording medium.
  • the program may be stored in the ROM 502.
  • the CPU 501 executes a program stored in the ROM 502 or the non-volatile storage 506 to realize the functions of the setting value data variation diagnosis unit.
  • the non-volatile storage 506 may also store the judgment thresholds for failure sign diagnosis used by the setting value data fluctuation diagnosis units 109 and 209 in the communication device ( Figure 2), case classification of failure sign diagnosis results ( Figures 3 and 4), and data acquired in a chronological order of setting value data for adjusting the transmission waveform ( Figure 2).
  • microcomputer 310 of the higher-level device 300 in FIG. 7 or the server 400 in FIG. 10 is to have a function for diagnosing signs of failure or a function for identifying the location of signs of failure
  • a program that realizes the same function as the setting value data fluctuation diagnosis unit 109, 209 is recorded in the ROM 502 or non-volatile storage 506 provided in the microcomputer 310 and the server 400.
  • the network interface 507 is configured with a communication device that controls communication with other devices (e.g., ECUs) via a network such as a communication line or in-vehicle Ethernet.
  • a communication device that controls communication with other devices (e.g., ECUs) via a network such as a communication line or in-vehicle Ethernet.
  • the input/output units 108, 208 of the communication device are realized by the network interface 507.
  • the wireless communication module 120 in the electronic control device 100B in FIG. 10 is an example of the network interface 507.
  • the present invention is not limited to the above-described embodiments, and it goes without saying that various other applications and modifications are possible without departing from the gist of the present invention as set forth in the claims.
  • the above-described embodiments are described in detail and specifically to clearly explain the present invention, and are not necessarily limited to those including all of the components described. It is also possible to replace part of the configuration of one embodiment with a component of another embodiment. It is also possible to add a component of another embodiment to the configuration of one embodiment. It is also possible to add, replace, or delete other components from part of the configuration of each embodiment.
  • each of the above configurations, functions, processing units, etc. may be realized in hardware, for example by designing some or all of them as an integrated circuit.
  • a broad processor device such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit) may be used as the hardware.
  • each of the above configurations, functions, processing units, etc. may be realized in software by a processor in a computer interpreting and executing a program that realizes each function.
  • control lines and information lines are those that are considered necessary for the explanation, and not all control lines and information lines in the product are necessarily shown. In reality, it can be considered that almost all components are connected to each other.

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  • Environmental & Geological Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)

Abstract

Ce dispositif de communication effectue une transmission de signaux de données, et comprend une unité de diagnostic de variation de données de consigne qui utilise des premières données de consigne, qui sont destinées à ajuster une forme d'onde de transmission lorsque des signaux de données sont échangés avec un dispositif externe par l'intermédiaire d'une ligne de transmission, et des secondes données de consigne, qui sont destinées à régler la forme d'onde de transmission lorsque des signaux de données sont rebouclés entre un circuit d'émission et un circuit de réception à l'intérieur du dispositif de transmission, pour déterminer, sur la base d'une condition de détermination prescrite, une variation des premières données de consigne lorsque des signaux de données sont échangés par l'intermédiaire du dispositif externe et de la ligne de transmission, et une variation des secondes données de consigne lorsque des signaux de données sont rebouclés entre le circuit d'émission et le circuit de réception, et qui diagnostique un signe de défaillance dans le dispositif de communication et la ligne de transmission sur la base du résultat de détermination.
PCT/JP2022/041318 2022-11-07 2022-11-07 Dispositif de communication, système de communication et procédé de diagnostic de signe de défaillance WO2024100699A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04239296A (ja) * 1991-01-14 1992-08-27 Matsushita Electric Works Ltd 多重伝送装置
WO2020179151A1 (fr) * 2019-03-04 2020-09-10 株式会社日立製作所 Appareil de communication embarqué et véhicule ferroviaire
WO2021084635A1 (fr) * 2019-10-30 2021-05-06 日本電信電話株式会社 Dispositif de transmission et procédé de transmission

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04239296A (ja) * 1991-01-14 1992-08-27 Matsushita Electric Works Ltd 多重伝送装置
WO2020179151A1 (fr) * 2019-03-04 2020-09-10 株式会社日立製作所 Appareil de communication embarqué et véhicule ferroviaire
WO2021084635A1 (fr) * 2019-10-30 2021-05-06 日本電信電話株式会社 Dispositif de transmission et procédé de transmission

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