WO2020194429A1 - Dispositif de détection d'anomalie de câblage - Google Patents

Dispositif de détection d'anomalie de câblage Download PDF

Info

Publication number
WO2020194429A1
WO2020194429A1 PCT/JP2019/012398 JP2019012398W WO2020194429A1 WO 2020194429 A1 WO2020194429 A1 WO 2020194429A1 JP 2019012398 W JP2019012398 W JP 2019012398W WO 2020194429 A1 WO2020194429 A1 WO 2020194429A1
Authority
WO
WIPO (PCT)
Prior art keywords
step signal
transmission line
unit
wiring
signal output
Prior art date
Application number
PCT/JP2019/012398
Other languages
English (en)
Japanese (ja)
Inventor
佑紀 岡南
幸司 澁谷
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2021508406A priority Critical patent/JP6956917B2/ja
Priority to PCT/JP2019/012398 priority patent/WO2020194429A1/fr
Publication of WO2020194429A1 publication Critical patent/WO2020194429A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing

Definitions

  • the present invention relates to a wiring abnormality detection device that detects the position of a wire breakage or short circuit.
  • bus wiring in which a plurality of electronic devices such as an ECU (Electronic Control Unit) are connected on the same line is used. If an electrical or physical load exceeding the specified value is applied to such bus wiring, or if it deteriorates over time, a wiring error such as a partial disconnection or short circuit of the wiring will occur, causing a communication error. There is a problem.
  • ECU Electronic Control Unit
  • Patent Document 1 discloses an impedance measuring device that measures the impedance of a terminator of a circuit to be measured by using a TDR (Time Domain Reflectometry) method.
  • the impedance measuring device applies a pulse signal having a pulse width longer than the propagation delay time of the signal propagating in the measurement target circuit to the measurement target circuit by the TDR method, and applies the reflected signal of the pulse signal to the output end of the pulse signal.
  • the impedance measuring device Based on the observed reflected signal, detects the change in impedance in the circuit to be measured together with the position where the change in impedance occurs.
  • This method is also used to detect the disconnection position of the circuit to be measured because the impedance changes at the position where the disconnection occurs in the wiring as well as the impedance changes at the terminator of the circuit to be measured.
  • the above-mentioned "pulse signal having a pulse width longer than the propagation delay time of the signal propagating in the measurement target circuit” is referred to as a "step signal”.
  • the “propagation delay time” means the time required for the signal to pass through the wiring.
  • a capacitor may be mounted between the signal input terminal and the terminal connected to the ground in order to remove external noise.
  • the capacitance value of such a capacitor varies depending on the manufacturer, but if the capacitance value of the capacitor is on the order of 0.01 ⁇ F to 0.1 ⁇ F, the above-mentioned TDR method is used to bus from the reflected wave waveform. Even if an attempt is made to detect a broken or short-circuited position of the wiring, there is a problem that the detection accuracy of the broken or short-circuited position is lowered because the charging time of the capacitor is long.
  • the present invention has been made to solve the above-mentioned problems, and the accuracy of detecting the position of wiring abnormality in the bus wiring is lowered by the capacitor for removing noise of the electronic device connected to the bus wiring. It is an object of the present invention to provide a technique capable of suppressing the operation.
  • the wiring abnormality detection device has a first step signal output unit that outputs a first step signal to a transmission line connected to an electronic device on which a capacitor is mounted via a branch wiring, and a transmission line.
  • a reflected wave observation unit that acquires the first observation data by observing the waveform of the reflected wave of the first step signal, and a rising edge of the first step signal output by the first step signal output unit.
  • the time is less than or equal to the propagation delay time of the branch wiring.
  • the noise reduction capacitor of the electronic device connected to the bus wiring can suppress the deterioration of the detection accuracy of the position of the wiring abnormality in the bus wiring.
  • FIG. 3A and 3B are graphs for explaining specific examples of the wiring abnormality detecting method by the wiring abnormality detecting device, respectively.
  • FIG. 3A and 3B are graphs for explaining specific examples of the wiring abnormality detecting method by the wiring abnormality detecting device, respectively.
  • FIG. It is a block diagram which shows the structure of the step signal output part provided in the wiring abnormality detection apparatus which concerns on Embodiment 2.
  • FIG. 7A, 7B, and 7C are graphs for explaining specific examples of the wiring abnormality detecting method by the wiring abnormality detecting device 20, respectively.
  • 8A and 8B are graphs showing waveforms of reflected waves observed by the TDR type measuring device, respectively.
  • Embodiment 1 As an example of the ECU in which the capacitor is mounted as described above, there is an evaluation board for evaluating the CAN transceiver described in the following URL. (URL: https://www.analog.com/media/jp/technical-documentation/user-guides/UG-234_jp.pdf ) It is assumed that a disconnection or short circuit in the bus wiring to which the ECU is connected as described above is detected by applying a step signal having a rise time of 3.0 ns to the bus wiring by using, for example, the TDR method (step). The output voltage of the signal is 2V).
  • the disconnection position can be specified based on the waveform of the reflected wave of the step signal.
  • the capacitance value of the capacitor mounted on the ECU is 0.1 ⁇ F, the accuracy of the disconnection detection position may decrease. The reason for this will be described below with reference to FIG.
  • FIG. 8A is a graph showing the waveform of the reflected wave observed by the TDR type measuring device when the capacitance value of the capacitor mounted on the ECU is 100 pF.
  • FIG. 8B is a graph showing the waveform of the reflected wave observed by the TDR type measuring device when the capacitance value of the capacitor mounted on the ECU is 0.1 ⁇ F.
  • the vertical axis represents the voltage [V] of the reflected wave observed by the TDR type measuring device
  • the horizontal axis is the time [ns]
  • the solid line is the disconnection in the bus wiring to be measured.
  • the graph shows the case where the wire is broken, and the dotted line shows the graph when there is no disconnection in the bus wiring to be measured.
  • the time on the horizontal axis corresponds to the distance from the TDR type measuring device, and the disconnection position or short-circuit position in the bus wiring is detected by detecting the disturbance of the waveform. be able to.
  • the disconnection position or short-circuit position of the bus wiring can be specified based on the waveform of the reflected wave. This is because the voltage is temporarily dropped by the 100 pF capacitor charging the pulse signal at 100 ns of time, but the reflected wave is generated immediately, so that the voltage at the point A is not affected.
  • the capacitance value of the capacitor mounted on the ECU is 0.1 ⁇ F
  • the voltage drops sharply at point B in FIG. 8B in both the solid line graph and the dotted line graph.
  • the 0.1 ⁇ F capacitor charges the pulse signal, which delays the time for the reflected wave from the capacitor to return to the measuring device. Therefore, in FIG. 8B, the voltage after the point B becomes lower than the voltage before the point B, and the disturbance of the waveform of the reflected wave as shown by the solid line in FIG. 8A cannot be detected.
  • the first embodiment aims to solve the above problems.
  • FIG. 1 is a block diagram showing a configuration of a wiring abnormality detection system 100 including a wiring abnormality detection device 1 according to the first embodiment.
  • the wiring abnormality detection system 100 includes a wiring abnormality detection device 1, a transmission line 2, an ECU 3, an ECU 4, an ECU 5, and an ECU 6.
  • the transmission line 2 is composed of a main line and a branch wiring, and the main line connects the ECU 3, the ECU 4, the ECU 5 and the ECU 6 via the branch wiring.
  • a disconnection point X exists in the wiring connecting the ECU 5 and the ECU 6 in the transmission line 2.
  • the ECU 5 is connected to a branch wiring Y having a branch wiring length L in the transmission line 2, and is equipped with a capacitor for noise removal (not shown).
  • the wiring abnormality detection device 1 is connected to a transmission line 2 in the vicinity of the ECU 3 connected to the terminal side of the transmission line 2, and detects the position of the disconnection point X of the transmission line 2 by using the TDR method.
  • Examples of the signal transmission method by the wiring abnormality detection device 1 include single-ended transmission using one signal line and ground, or differential transmission using two signal lines.
  • the wiring abnormality detection device 1 includes a first step signal output unit 11, a reflected wave observation unit 12, a storage unit 13, and a control unit 14.
  • the control unit 14 includes a clock generation unit 141 and a position calculation unit 142.
  • the first step signal output unit 11 outputs the first step signal to the transmission line 2.
  • the details of the first step signal output unit 11 will be described later.
  • the reflected wave observation unit 12 acquires the first observation data by observing the waveform of the reflected wave of the first step signal from the transmission line 2.
  • An analog-to-digital conversion circuit or the like can be mentioned as an example of the reflected wave observation unit 12.
  • Examples of the first observation data include data in which the voltage of the reflected wave of the observed first step signal is associated with the time when the voltage is observed.
  • the storage unit 13 stores the first observation data acquired by the reflected wave observation unit 12.
  • the clock generation unit 141 of the control unit 14 synchronizes the timing at which the first step signal output unit 11 outputs the first step signal with the timing at which the reflected wave observation unit 12 observes the waveform of the reflected wave. To generate.
  • the first step signal output unit 11 described above outputs the first step signal based on the clock signal
  • the reflected wave observation unit 12 described above outputs the first step signal based on the clock signal. Observe the waveform of the reflected wave of the first step signal.
  • the position calculation unit 142 of the control unit 14 calculates the position of the disconnection or short circuit of the transmission line 2 based on the waveform of the reflected wave observed by the reflected wave observation unit 12. More specifically, the position calculation unit 142 determines the position of the disconnection or short circuit of the transmission line 2 based on the reference data stored in the storage unit 13 and the waveform of the reflected wave observed by the reflected wave observation unit 12. calculate.
  • the rise time of the first step signal output by the first step signal output unit 11 is equal to or less than the propagation delay time of the branch wiring Y of the transmission line 2.
  • the propagation delay time is obtained by multiplying the branch wiring length L of the transmission line 2 and the propagation delay time per unit length of the branch wiring Y of the transmission line 2.
  • the rise time of the first step signal is the time from the time when the voltage of the first step signal becomes the value of 0 to the time when the voltage becomes the value of the amplitude.
  • the propagation delay time ⁇ d per unit length of the transmission line 2 can be calculated by using the following equation (1) if the relative permittivity ⁇ r of the transmission line 2 is known.
  • the dielectric constant of the transmission line 2 may be obtained from the information disclosed by the cable manufacturer.
  • the propagation delay time is defined as 5.0 ns / m in the standard, so that information may be used.
  • the rise time of the first step signal output by the first step signal output unit 11 As an example of the rise time of the first step signal output by the first step signal output unit 11, an example in which the transmission line 2 from which the first step signal is output is a CAN cable will be described below.
  • the unit length of the CAN cable is calculated from the above equation (1).
  • the propagation delay time ⁇ d of is calculated to be about 4.47 ns / m.
  • the propagation delay time of the branch wiring of the CAN cable is calculated to be about 223 ps by the product of the propagation delay time ⁇ d per unit length of the CAN cable and the length of the branch wiring length of the CAN cable. .. Therefore, the rise time of the first step signal output by the first step signal output unit 11 is about 223 ps or less.
  • the FPGA field-programmable gate array
  • URL https://japan.xilinx.com/support/documentation/data_sheets/j_ds181_Artix_7_Data_Sheet.pdf
  • the FPGA of Xilinx Artix®-7 described in the above URL can output a step signal having a rise time of 50 ps, such a signal source may be used.
  • the FPGA may be adopted as a configuration having the above-mentioned function of the first step signal output unit 11, the function of the clock generation unit 141 of the above-mentioned control unit 14, and the function of the position calculation unit 142. ..
  • FIG. 2 is a flowchart showing a wiring abnormality detection method by the wiring abnormality detection device 1 according to the first embodiment.
  • the wiring abnormality detection device 1 executes the wiring abnormality detection method when the communication network is stopped.
  • the first step signal output unit 11 outputs the first step signal to the transmission line 2 (step ST1).
  • the rise time of the first step signal is equal to or less than the propagation delay time of the branch wiring Y of the transmission line 2.
  • the reflected wave observation unit 12 acquires the first observation data by observing the waveform of the reflected wave of the first step signal from the transmission line 2 (step ST2).
  • the reflected wave observation unit 12 stores the acquired first observation data in the storage unit 13.
  • step ST1 and step ST2 the timing at which the first step signal output unit 11 outputs the first step signal and the reflected wave observation unit by the clock signal generated by the clock generation unit 141 of the control unit 14
  • the timing at which 12 observes the waveform of the reflected wave is synchronized. That is, at the same time that the first step signal output unit 11 starts outputting the first step signal, the reflected wave observation unit 12 starts observing the waveform of the reflected wave.
  • the position calculation unit 142 determines whether or not the reference data is stored in the storage unit 13 (step ST3).
  • the reference data include observation data acquired by the reflected wave observation unit 12 when the transmission line 2 is not disconnected or short-circuited.
  • the position calculation unit 142 proceeds to the process of step ST4 described later.
  • the position calculation unit 142 determines that the reference data is not stored in the storage unit 13 (NO in step ST3), the position calculation unit 142 stores the acquired first observation data in the storage unit 13 as a candidate for the reference data (step ST5). ).
  • the wiring abnormality detection device 1 returns to the process of step ST1 described above.
  • step ST4 the position calculation unit 142 subtracts the voltage of the reference data stored in the storage unit 13 from the voltage of the first observation data acquired by the reflected wave observation unit 12 in step ST2 for each time. calculate.
  • step ST6 the position calculation unit 142 determines whether or not there is a time when the difference exceeds the threshold value in the difference data calculated in step ST4 (step ST6).
  • the threshold value may be a value less than or equal to the difference observed when a disconnection occurs in the transmission line 2. Alternatively, the threshold value may be a value greater than or equal to the difference observed when a short circuit occurs in the transmission line 2.
  • step ST6 determines that there is a time when the difference exceeds the threshold value in the difference data calculated in step ST4 (YES in step ST6)
  • the position calculation unit 142 proceeds to the process of step ST7 described later.
  • the position calculation unit 142 determines that there is no time when the difference exceeds the threshold value in the difference data calculated in step ST4 (NO in step ST6), it determines that there is no disconnection or short circuit in the transmission line 2. (Step ST8).
  • step ST7 the position calculation unit 142 determines that there is a disconnection or short circuit in the transmission line 2, and determines the position of the disconnection or short circuit in the transmission line 2 based on the time when the difference exceeds the threshold value in the difference data. calculate.
  • the position calculation unit 142 calculates the position of the disconnection or short circuit of the transmission line 2 based on the time when the difference exceeds the threshold value in the difference data.
  • the calculation method shown in the following equation (2) can be mentioned. ..
  • T indicates the time from the time when the first step signal output unit 11 outputs the first step signal to the time when the reflected wave observation unit 12 observes the waveform of the reflected wave.
  • X indicates the distance from the wiring abnormality detecting device 1.
  • the position X of the disconnection or short circuit of the transmission line 2 can be calculated by inputting the time when the difference exceeds the threshold value into T.
  • the position calculation unit 142 may calculate the position of the disconnection of the transmission line 2 based on the time when the difference changes from 0 to a positive value in the difference data in step ST7.
  • the position calculation unit 142 may calculate the position of the short circuit of the transmission line 2 based on the time when the difference changes from 0 to a negative value in the difference data in step ST7.
  • 3A and 3B are graphs for explaining specific examples of the wiring abnormality detection method by the wiring abnormality detection device 1, respectively.
  • the capacitance of the noise removing capacitor mounted on the ECU 5 is 0.1 ⁇ F
  • the rise time of the first step signal output by the first step signal output unit 11 is set to 220 ps.
  • the result of the circuit simulation is shown.
  • the disconnection position of the transmission line 2 is 15.0 m from the ECU 3 on the terminal side.
  • FIG. 3A is a graph showing the waveform of the first observation data acquired by the reflected wave observation unit 12 in the above step ST2 and the waveform of the reference data used by the position calculation unit 142 in the above step ST4.
  • the vertical axis represents the voltage [V] of the reflected wave
  • the horizontal axis is the time [ns] at which the voltage [V] was observed.
  • the solid line graph in FIG. 3A shows the first observation data
  • the dotted line graph shows the reference data.
  • the voltage drops sharply in both the solid line graph and the dotted line graph.
  • FIG. 3B is a graph showing the difference obtained by subtracting the voltage of the reference data from the voltage of the first observation data calculated by the position calculation unit 142 in step ST4.
  • the vertical axis represents the differential voltage [V]
  • the horizontal axis is the time [ns] at which the differential voltage [V] was observed.
  • the waveform of the differential voltage is disturbed, indicating that the disconnection point X exists in the transmission line 2.
  • the turbulence of the waveform shows a sharp peak at time 145 ns.
  • the position calculation unit 142 inputs the time into the above equation (2) ( ⁇ r uses a value different from the above value), and 14.9 m from the wiring abnormality detection device 1.
  • the position is calculated as the position of the disconnection of the transmission line 2. Since the disconnection position of the transmission line 2 in the circuit simulation is 15.0 m from the ECU 3 on the terminal side, assuming that the position of the wiring abnormality detection device 1 and the position of the ECU 3 are substantially the same, the position calculation unit 142 It can be seen that the disconnection position calculated by is within the range of an error of 0.1 m.
  • the wiring abnormality detection device 1 outputs the first step signal to the transmission line 2 connected to the ECU 5 of the electronic device on which the capacitor is mounted via the branch wiring Y.
  • the first step signal output unit 11 and the reflected wave observation unit 12 for acquiring the first observation data by observing the waveform of the reflected wave of the first step signal from the transmission line 2 are provided.
  • the rise time of the first step signal output by the step signal output unit 11 of the above is equal to or less than the propagation delay time of the branch wiring Y. According to the above configuration, it is possible to suppress a decrease in the detection accuracy of a wiring abnormality position in the bus wiring due to the noise removing capacitor of the electronic device connected to the bus wiring. The reason why the wiring abnormality detecting device 1 according to the first embodiment exerts such an effect will be described in detail below.
  • the step signal output by the first step signal output unit 11 When reaches the capacitor, charging of the capacitor begins. If the capacitance value of the capacitor is large, it takes time to charge, so even if the main line of the transmission line 2 ahead of the branch wiring Y connected to the ECU 5 is disconnected, a wiring abnormality detection at the output end of the step signal is detected. It takes time for the reflected signal to be returned to the device 1. Therefore, the voltage of the observed reflected signal becomes low, and the disturbance of the waveform due to the disconnection cannot be detected.
  • the step signal flowing through the branch wiring usually reaches the above-mentioned capacitor before the voltage of the step signal reaches the upper limit value at the branch point between the main line and the branch wiring. ..
  • the voltage drops due to the influence of the above-mentioned capacitor, and the power of the step signal is not distributed to the main line after the branch point. Therefore, since no reflected wave is generated at the disconnection point of the main line after the branch point, the disconnection cannot be detected.
  • the rise time of the step signal is equal to or less than the propagation delay time of the branch wiring Y as in the configuration of the wiring abnormality detection device 1 according to the first embodiment, the length of the branch wiring Y is the branch wiring Y.
  • the step signal flowing through the branch wiring Y does not reach the above-mentioned capacitor when the voltage of the step signal reaches the upper limit value at the branch point. become.
  • the power of the step signal whose voltage reaches the upper limit value at the branch point is not affected by the above-mentioned capacitor, and depends on each impedance between the main line and the branch wiring Y after the branch point. Will be distributed. Then, the electric power flowing through the main line is reflected at the disconnection point X, so that the waveform of the reflected wave is disturbed and the disconnection position can be detected.
  • the detection accuracy of the wiring abnormality position in the bus wiring can be improved by the noise removing capacitor of the electronic device connected to the bus wiring. It is possible to suppress the decrease.
  • the timing at which the first step signal output unit 11 outputs the first step signal and the timing at which the reflected wave observation unit 12 observes the waveform of the reflected wave It also has a clock generator that generates a clock signal that synchronizes the clock signals.
  • the timing of outputting the first step signal and the timing of observing the waveform of the reflected wave of the first step signal can be synchronized, so that the first step signal is output.
  • the time from the time to the time when the waveform of the reflected wave of the first step signal is observed can be accurately measured.
  • the accuracy of detecting the position of the wiring abnormality in the bus wiring can be improved by detecting the position of the wiring abnormality in the bus wiring based on the time.
  • the wiring abnormality detection device 1 further includes a position calculation unit that calculates the position of the disconnection or short circuit of the transmission line 2 based on the first observation data acquired by the reflected wave observation unit 12. ing. According to the above configuration, the position of the disconnection or short circuit in the bus wiring can be detected based on the acquired first observation data.
  • Embodiment 2 In the first embodiment described above, in step ST4, the position calculation unit 142 calculates the difference obtained by subtracting the reference data from the first observation data for each time, and in step ST6, the difference among the difference data sets a threshold value.
  • the configuration for determining the presence or absence of disconnection or short circuit by determining whether or not there is an exceeded time has been described. However, in the first embodiment, when the reference data does not exist, the position calculation unit 142 cannot determine whether or not there is a disconnection or a short circuit.
  • the second embodiment aims to solve such a problem.
  • the second embodiment will be described below with reference to the drawings. The same reference numerals are given to the configurations having the same functions as those described in the first embodiment, and the description thereof will be omitted.
  • FIG. 4 is a block diagram showing the configuration of the wiring abnormality detection system 101 including the wiring abnormality detection device 20 according to the second embodiment.
  • the wiring abnormality detection device 20 according to the second embodiment further includes the switch control unit 153 in the control unit 15 as compared with the wiring abnormality detection device 1 according to the first embodiment. The difference is that the step signal output unit 16 is provided instead of the first step signal output unit 11.
  • FIG. 5 is a block diagram showing a configuration of a step signal output unit 16 included in the wiring abnormality detection device 20.
  • the step signal output unit 16 includes a switch 111, a first step signal output unit 112, a second step signal output unit 113, and an output resistor 114.
  • the wiring abnormality detection device 20 includes two signal sources, the first step signal output unit 112 and the second step signal output unit 113, but the wiring abnormality detection device 20 will be described. May include three or more signal sources.
  • the first step signal output unit 112 outputs the first step signal to the transmission line 2 in the same manner as the first step signal output unit 11 in the first embodiment.
  • the rise time of the first step signal output by the first step signal output unit 112 is equal to or less than the propagation delay time of the branch wiring Y of the transmission line 2.
  • the reflected wave observation unit 12 in the second embodiment acquires the first observation data by observing the waveform of the reflected wave of the first step signal from the transmission line 2, and stores the first observation data. It is stored in the part 13.
  • the position calculation unit 142 in the second embodiment determines whether or not there is a time when the voltage exceeds the threshold value in the first observation data acquired by the reflected wave observation unit 12 observing the first step signal. To judge. When the position calculation unit 142 determines that the time when the voltage exceeds the threshold value exists in the first observation data, it determines that the transmission line 2 has a disconnection or a short circuit.
  • the threshold value is a value equal to or lower than the voltage observed when a disconnection occurs in the transmission line 2. Alternatively, the threshold value is a value equal to or higher than the voltage observed when a short circuit occurs in the transmission line 2.
  • the switch control unit 153 of the control unit 15 controls the switch 111 of the step signal output unit 16 when the position calculation unit 142 determines that there is no time when the voltage exceeds the threshold value in the first observation data. As a result, the signal source for outputting the step signal is switched from the first step signal output unit 112 to the second step signal output unit 113.
  • the second step signal output unit 113 outputs the second step signal to the transmission line 2.
  • the rise time of the second step signal output by the second step signal output unit 113 is more than twice the propagation delay time of the branch wiring Y of the transmission line 2.
  • the propagation delay time is obtained by multiplying the branch wiring length L of the transmission line 2 and the propagation delay time per unit length of the transmission line 2. For example, when the rise time of the first step signal is about 223 ps or less as in the example of the rise time of the first step signal in the first embodiment, the rise time of the second step signal is the first. It may be 446 ps or more as long as it is twice or more the rise time of the step signal.
  • the reflected wave observation unit 12 acquires the second observation data by observing the waveform of the reflected wave of the second step signal from the transmission line 2, and stores the second observation data in the storage unit 13. ..
  • the position calculation unit 142 calculates the position of the disconnection or short circuit of the transmission line 2 based on the waveform of the reflected wave of the first step signal and the waveform of the reflected wave of the second step signal stored in the storage unit 13. To do. More specifically, the difference obtained by subtracting the voltage of the second observation data from the voltage of the first observation data stored in the storage unit 13 is calculated for each time.
  • the position calculation unit 142 determines whether or not there is a time when the difference changes from 0 to a positive value in the calculated difference data, and thus determines whether or not there is a disconnection point in the transmission line 2. To judge. Then, the position calculation unit 142 calculates the position of the disconnection of the transmission line 2 based on the time when the difference changes from 0 to a positive value. Alternatively, the position calculation unit 142 determines whether or not there is a time when the difference changes from 0 to a negative value in the calculated difference data, and thus determines whether or not there is a short-circuited portion in the transmission line 2. To judge. Then, the position calculation unit 142 calculates the position of the short circuit of the transmission line 2 based on the time when the difference changes from 0 to a negative value.
  • FIG. 6 is a flowchart showing a wiring abnormality detection method by the wiring abnormality detection device 20 according to the second embodiment.
  • the first step signal output unit 112 outputs the first step signal to the transmission line 2 (step ST10).
  • the rise time of the first step signal is equal to or less than the propagation delay time of the branch wiring Y of the transmission line 2.
  • the reflected wave observing unit 12 observes the waveform of the reflected wave of the first step signal from the transmission line 2 (step ST11).
  • step ST10 and step ST11 the timing at which the first step signal output unit 112 outputs the first step signal by the clock signal generated by the clock generation unit 141 of the control unit 15, and the reflected wave observation unit.
  • the timing at which 12 observes the waveform of the reflected wave is synchronized.
  • the reflected wave observation unit 12 stores the first observation data obtained by the observation in step ST11 in the storage unit 13 (step ST12). Further, the reflected wave observation unit 12 stores the first observation data acquired by the observation in step ST2 in the storage unit 13.
  • the position calculation unit 142 determines whether or not there is a time when the voltage exceeds the threshold value in the first observation data acquired by the reflected wave observation unit 12 observing the first step signal in step ST11. (Step ST13).
  • the position calculation unit 142 determines that there is a time when the voltage exceeds the threshold value in the first observation data (YES in step ST13)
  • it determines that there is a disconnection or short circuit in the transmission line 2
  • the first The position of the disconnection or short circuit of the transmission line 2 is calculated based on the time when the voltage exceeds the threshold value in the observation data of (step ST14).
  • the wiring abnormality detection device 20 proceeds to step ST15. ..
  • step ST15 the switch control unit 153 of the control unit 15 switches the signal source for outputting the step signal from the first step signal output unit 112 to the second step signal output unit 113 by controlling the switch 111.
  • the second step signal output unit 113 outputs the second step signal to the transmission line 2 (step ST15).
  • the rise time of the second step signal output by the second step signal output unit 113 is more than twice the propagation delay time of the branch wiring Y of the transmission line 2.
  • step ST16 the reflected wave observing unit 12 observes the waveform of the reflected wave of the second step signal from the transmission line 2 (step ST16).
  • step ST15 and step ST16 the timing at which the second step signal output unit 113 outputs the second step signal by the clock signal generated by the clock generation unit 141 of the control unit 15, and the reflected wave observation unit.
  • the timing at which 12 observes the waveform of the reflected wave is synchronized.
  • the reflected wave observation unit 12 stores the second observation data acquired by the observation in step ST16 in the storage unit 13 (step ST17).
  • the position calculation unit 142 calculates the difference obtained by subtracting the voltage of the second observation data from the voltage of the first observation data stored in the storage unit 13 for each time (step ST18).
  • the position calculation unit 142 determines whether or not there is a time when the difference changes from 0 to a positive value in the calculated difference data (step ST19).
  • the position calculation unit 142 determines that there is a time when the difference changes from 0 to a positive value in the difference data (YES in step ST19)
  • the position calculation unit 142 proceeds to the process of step ST20 described later.
  • the position calculation unit 142 determines that there is no time when the difference changes from 0 to a positive value in the difference data (NO in step ST19)
  • the position calculation unit 142 determines that there is no disconnection or short circuit in the transmission line 2. (Step ST21).
  • the position calculation unit 142 determines that there is a disconnection or short circuit in the transmission line 2, and determines the position of the disconnection or short circuit in the transmission line 2 based on the time when the difference exceeds the threshold value in the difference data. calculate.
  • the position calculation unit 142 may calculate the position of the disconnection of the transmission line 2 based on the time when the difference changes from 0 to a positive value in the difference data in step ST20.
  • the position calculation unit 142 may calculate the position of the short circuit of the transmission line 2 based on the time when the difference changes from 0 to a negative value in the difference data in step ST20.
  • the position calculation unit 142 calculate the position of the disconnection or short circuit of the transmission line 2 based on the time when the difference changes from 0 to a negative value in the difference data in step ST20.
  • the position calculation unit 142 determines in step ST19 whether or not there is a time when the difference changes from 0 to a positive value in the difference data. Judgment is made by comparing two adjacent points included in. More specifically, the position calculation unit 142 sets v 1 > 0 and v 1 > 0, where each time and difference voltage of two adjacent points in the difference data are (t 1 , v 1 ) (t 2 , v 2 ). If v 2 > 0.1, "1" is returned, and if v 1 and v 2 are other values, "0" is returned.
  • the position calculation unit 142 executes this work for all of the difference data, and determines that the time when "1" is returned is the time when the difference exceeds the threshold value in the difference data. Next, in step ST20, the position calculation unit 142 calculates the position of the disconnection of the transmission line 2 based on the time.
  • FIGS. 7A, 7B, and 7C are graphs for explaining specific examples of the wiring abnormality detection method by the wiring abnormality detection device 20, respectively.
  • the capacitance of the noise removing capacitor mounted on the ECU 5 is 0.1 ⁇ F
  • the rise time of the first step signal output by the first step signal output unit 112 is 220 ps
  • the second The result of the circuit simulation executed with the rise time of the first step signal output by the step signal output unit 113 of the above as 3000 ps is shown.
  • the disconnection position of the transmission line 2 is 15.0 m from the ECU 3 on the terminal side, as in the specific example shown in FIGS. 3A and 3B of the first embodiment.
  • FIG. 7A is a graph showing a waveform of the first observation data acquired by the reflected wave observation unit 12 in the above step ST11 and a waveform of the second observation data acquired by the reflected wave observation unit 12 in the above step ST16.
  • the vertical axis represents the voltage [V] of the reflected wave
  • the horizontal axis represents the time [ns] at which the voltage [V] was observed.
  • the solid line graph in FIG. 7A shows the first observation data
  • the dotted line graph shows the second observation data.
  • the voltage drops sharply in both the solid line graph and the dotted line graph.
  • FIG. 7B is a graph showing the difference obtained by subtracting the voltage of the second observation data from the voltage of the first observation data calculated by the position calculation unit 142 in step ST18.
  • the vertical axis represents the differential voltage [V]
  • the horizontal axis is the time [ns] at which the differential voltage [V] was observed.
  • the waveform of the difference voltage is disturbed, indicating that the disconnection point X exists in the transmission line 2.
  • the turbulence of the waveform shows a sharp peak at time 145 ns.
  • the position calculation unit 142 determines that the time at point H is the time when the difference changes from 0 to a positive value in the difference data.
  • the waveform is also distorted at the time 45ns and the time 95ns before the time of the point H, but these times are the times when the difference changes from 0 to a negative value.
  • FIG. 7C is a graph showing the determination result.
  • the vertical axis takes a value of "1" or "0", where "1" indicates that there is a disconnection and "0" indicates that there is no disconnection.
  • the horizontal axis is the observation time [ns] from which the determination result was obtained. As shown in FIG.
  • the position calculation unit 142 calculates the position of the disconnection or short circuit of the transmission line 2 based on the time 145 ns.
  • the wiring abnormality detection device 20 further includes a second step signal output unit 113 that outputs a second step signal on the transmission line 2, and is further provided with a second step signal output unit 113.
  • the rise time of the second step signal output by 113 is more than twice the propagation delay time of the branch wiring Y, and the reflected wave observation unit 12 is the reflected wave of the second step signal from the transmission line 2.
  • the second observation data is acquired by further observing the waveform, and the position calculation unit 142 calculates the position of the disconnection or short circuit of the transmission line 2 based on the first observation data and the second observation data. To do.
  • the position of the disconnection or short circuit of the transmission line 2 is calculated based on the first observation data and the second observation data, it is not necessary to prepare the above reference data in advance. Therefore, it is possible to determine the presence or absence of disconnection immediately after acquiring the first observation data and the second observation data without preparing the reference data in advance.
  • the presence or absence of disconnection could be determined only after the reference data was acquired. That is, if a disconnection occurs before the reference data is acquired, the disconnection cannot be detected when a capacitor having a capacitance of 0.01 ⁇ F to 0.1 ⁇ F is mounted in the ECU.
  • the wiring abnormality detection device 20 it is possible to determine the presence or absence of disconnection at the time when the first observation data and the second observation data are acquired, regardless of the characteristics of the capacitor of the ECU.
  • the wiring abnormality detection device 20 has a switch control unit that switches a signal source that outputs a step signal to the transmission line 2 from the first step signal output unit to the second step signal output unit. Further prepared.
  • the signal source for outputting the step signal to the transmission line 2 is switched from the first step signal output unit 112 to the second step signal output unit 113, and the second step signal is transmitted to the transmission line 2.
  • the second observation data is acquired by outputting and observing the waveform of the reflected wave of the second step signal.
  • the position of the disconnection or short circuit of the transmission line 2 can be calculated based on the first observation data and the second observation data, and it is not necessary to prepare the above-mentioned reference data in advance.
  • the wiring abnormality detection device it is possible to prevent the detection accuracy of the wiring abnormality position in the bus wiring from being lowered by the capacitor for removing noise of the electronic device connected to the bus wiring. It can be used as a wiring abnormality detection device that detects the position of a disconnection or short circuit.
  • 1 Wiring abnormality detection device 2 Transmission line, 3 ECU, 4 ECU, 5 ECU, 6 ECU, 11 1st step signal output unit, 12 reflected wave observation unit, 13 storage unit, 14 control unit, 15 control unit, 16 Step signal output unit, 20 wiring abnormality detection device, 100 wiring abnormality detection system, 101 wiring abnormality detection system, 111 switch, 112 first step signal output unit, 113 second step signal output unit, 114 output resistance, 141 clock Generation unit, 142 position calculation unit, 153 switch control unit

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Locating Faults (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

L'invention concerne un dispositif de détection d'anomalie de câblage (1) qui comprend : une première unité de sortie de signal échelon (11) qui délivre en sortie un premier signal échelon à une ligne de transmission (2) connectée par un câblage de ramification à un ECU (5) qui est un instrument électronique dans lequel un condensateur est monté; et une unité d'observation d'onde réfléchie (12) qui acquiert des premières données d'observation en observant la forme d'onde de l'onde réfléchie du premier signal échelon à partir de la ligne de transmission (2). Le temps de montée du premier signal échelon délivré en sortie par la première unité de sortie de signal échelon (11) est inférieur ou égal au temps de retard de propagation du câblage de ramification.
PCT/JP2019/012398 2019-03-25 2019-03-25 Dispositif de détection d'anomalie de câblage WO2020194429A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2021508406A JP6956917B2 (ja) 2019-03-25 2019-03-25 配線異常検出装置
PCT/JP2019/012398 WO2020194429A1 (fr) 2019-03-25 2019-03-25 Dispositif de détection d'anomalie de câblage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2019/012398 WO2020194429A1 (fr) 2019-03-25 2019-03-25 Dispositif de détection d'anomalie de câblage

Publications (1)

Publication Number Publication Date
WO2020194429A1 true WO2020194429A1 (fr) 2020-10-01

Family

ID=72609222

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/012398 WO2020194429A1 (fr) 2019-03-25 2019-03-25 Dispositif de détection d'anomalie de câblage

Country Status (2)

Country Link
JP (1) JP6956917B2 (fr)
WO (1) WO2020194429A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004056197A (ja) * 2002-07-16 2004-02-19 Denso Corp 電力線通信システム
JP2015007552A (ja) * 2013-06-25 2015-01-15 三菱電機株式会社 プリント基板の検査方法
JP2015022846A (ja) * 2013-07-17 2015-02-02 株式会社オートネットワーク技術研究所 ツイストペア線及びハーネス
JP2018181732A (ja) * 2017-04-19 2018-11-15 矢崎総業株式会社 車両用回路体

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006071462A (ja) * 2004-09-02 2006-03-16 Matsushita Electric Ind Co Ltd インピーダンス測定装置、治具基板、回路ユニット、及び治具回路

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004056197A (ja) * 2002-07-16 2004-02-19 Denso Corp 電力線通信システム
JP2015007552A (ja) * 2013-06-25 2015-01-15 三菱電機株式会社 プリント基板の検査方法
JP2015022846A (ja) * 2013-07-17 2015-02-02 株式会社オートネットワーク技術研究所 ツイストペア線及びハーネス
JP2018181732A (ja) * 2017-04-19 2018-11-15 矢崎総業株式会社 車両用回路体

Also Published As

Publication number Publication date
JP6956917B2 (ja) 2021-11-02
JPWO2020194429A1 (ja) 2021-09-13

Similar Documents

Publication Publication Date Title
JP4841166B2 (ja) 配線診断のための低電流ａｃ部分放電診断システム
KR102157507B1 (ko) 음향 거리 측정용 회로
KR100915712B1 (ko) 전력기기의 부분방전위치 검출시스템 및 방전위치 검출방법
JP5025224B2 (ja) 試験装置、ドライバコンパレータチップ、応答測定装置および校正方法
KR101548288B1 (ko) 반사파 계측을 이용한 배선 진단 시스템
TWI571066B (zh) A compensation circuit, an information processing device, a compensation method, and a computer-readable recording medium
KR101066563B1 (ko) 차동 신호 전송 장치 및 시험 장치
US20160245685A1 (en) Process and apparatus for the measurement
JP6956917B2 (ja) 配線異常検出装置
JP3509258B2 (ja) 伝送線路損失の補償手段を有するドライバ回路
JP5715060B2 (ja) 自動車両のための物体検出装置
KR20090011806A (ko) 펄스파 반사현상을 이용한 캔배선 진단시스템 및 방법
CN104614661A (zh) 电路雷达装置
US11927617B2 (en) Apparatus for monitoring a condition of an electrical power transmission medium
CN110709729A (zh) 物体检测装置
CN103217611A (zh) 绝缘检查装置及绝缘检查方法
CN104883147A (zh) 声发射检测仪前置放大器
KR20100039400A (ko) 시험 장치 및 전송 장치
US10527664B2 (en) Noise source analysis method
KR20210127874A (ko) 검사 장치 및 검사 방법
EP2684063B1 (fr) Dispositifs de test sans contact destinés à des cartes de circuits imprimés acheminant des signaux à grande vitesse
JP4466258B2 (ja) 回路配線基板の伝送線路の特性インピーダンスの算出方法
EP3982130A1 (fr) Appareil et procédé permettant de déterminer une réponse d'un dispositif sous test à une impulsion électrique générée par un générateur d'impulsions
JP4506154B2 (ja) 特性インピーダンス測定方法および測定装置
CN204422715U (zh) 电路雷达装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19921366

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2021508406

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19921366

Country of ref document: EP

Kind code of ref document: A1