JP6240802B1 - Wire inspection device - Google Patents

Abstract

An object of the present invention is to detect whether or not an electric wire can withstand noise intrusion from the outside. An electric wire inspection apparatus includes a first power supply terminal, a second power supply terminal, a power supply unit, a power control unit, a measurement unit, and an output unit. The power supply unit 36 supplies power to the wire harness 200 through the one end power supply terminal 30 and the other end power supply terminal 32. The power control unit 38 varies the voltage applied to the wire harness 200 a predetermined number of times within a predetermined period. The measurement unit 40 measures the voltage applied to the wire harness 200. The output unit 42 outputs a test result of whether or not noise has entered the wire harness 200 according to whether or not the number of times that the voltage applied to the wire harness 200 fluctuates within a predetermined period is different from the predetermined number. [Selection] Figure 1

Description

  The present invention relates to an electric wire inspection apparatus.

  Patent Document 1 discloses a contact state detection device. This contact state detection device is a device that detects the contact state of the electrical connection portion. This electrical connection portion connects the main body of the electronic device and the load unit. The contact state detection device includes a reference potential detection unit, a measured voltage detection unit, a contact abnormality detection unit, and a normal return detection unit. The reference potential detection unit detects potentials at two positions other than the end of the reference resistor on the electrical connection side as first and second reference potentials. The reference resistance is provided in a path of current flowing from the main body through the electrical connection to the load unit. The measured voltage detection unit detects a potential difference between both ends of the electrical connection unit. The contact abnormality detection unit detects a contact abnormality of the electrical connection unit based on the first reference potential and the output of the measured voltage detection unit. The normal return detection unit detects the return from the contact abnormality of the electrical connection unit to the normal state based on the second reference potential and the output of the measured voltage detection means. According to the contact state detection device disclosed in Patent Document 1, contact failure or contact abnormality of an electrical connection portion is not affected by load fluctuation during operation of an electronic device to which the electrical connection portion is connected. It can be detected accurately. According to the contact state detection device disclosed in Patent Document 1, the return from the state in which contact failure or contact abnormality is detected to the state in which contact is normal is influenced by load fluctuations during operation of the electronic device. Can be detected accurately.

JP 2007-298288 A

  However, the contact state detection device disclosed in Patent Document 1 has a problem in that it cannot detect whether or not the electric wire for connecting the main body of the electronic device and the load unit can withstand the intrusion of noise from the outside. is there. When such an electric wire cannot withstand the intrusion of noise from the outside and the electric wire is used for signal communication, an abnormality occurs in the communication.

  The present invention solves such problems. The purpose is to provide an electric wire inspection apparatus capable of detecting whether or not an electric wire can withstand the invasion of noise from the outside.

  The wire inspection apparatus of the present invention will be described with reference to the drawings. Note that the use of the reference numerals in the figure in this column is intended to assist understanding of the contents of the invention, and is not intended to limit the contents to the illustrated range.

In order to solve the above problems, according to an aspect of the present invention, the wire inspection apparatus 20 includes a pair of power supply terminals 30 and 32, a power supply unit 36, a power control unit 38, a measurement unit 40, and an output unit. 42. The pair of power supply terminals 30, 32, Ru is removed from the wire 200 is connected before the start of the test for the wire 200 to wire 200 which is an inspection of the object after completion of the inspection. The power supply unit 36 supplies power to the electric wire 200 through a pair of power supply terminals 30 and 32. The power control unit 38 controls the magnitude of power supplied to the electric wire 200 from the pair of power supply terminals 30 and 32. The measurement unit 40 is connected to a pair of power supply terminals 30 and 32. The measuring unit 40 measures at least one of the voltage applied to the electric wire 200 and the current flowing through the electric wire 200. The output unit 42 outputs a test result of whether or not noise has entered the electric wire 200 according to at least one of the voltage and current measured by the measuring unit 40. The power control unit 38 changes at least one of the voltage applied to the electric wire 200 and the current flowing through the electric wire 200 a predetermined number of times within a predetermined period. The output unit 42 counts the number of fluctuations. The number of fluctuations is the number of times that the power control unit 38 of the voltage applied to the electric wire 200 and the current flowing through the electric wire 200 fluctuated within a predetermined period. The output unit 42 outputs a test result of whether or not noise has entered depending on whether or not the number of fluctuations is different from the predetermined number.

  The electric wire inspection apparatus 20 according to the present invention is used in an environment where the electric wire 200 receives noise. The power supply unit 36 supplies power to the electric wire 200 through a pair of power supply terminals 30 and 32. The power control unit 38 changes at least one of the voltage applied to the electric wire 200 and the current flowing through the electric wire 200 a predetermined number of times within a predetermined period. The measurement unit 40 measures at least one of the voltage applied to the electric wire 200 and the electric wire 200. The output unit 42 counts the number of fluctuations. There is a difference between the number of fluctuations by the power control unit 38 and the number of fluctuations counted by the output unit 42 depending on how much the electric wire 200 can withstand the intrusion of noise from the outside. Thereby, the difference corresponds to the durability of the electric wire 200 against the intrusion of noise from the outside. The output unit 42 outputs a test result of whether or not noise has entered depending on whether or not the number of fluctuations is different from the predetermined number. As a result, the electric wire inspection apparatus 20 according to the present invention can detect whether or not the electric wire 200 can withstand the intrusion of noise from the outside.

  In addition, the output unit 42 described above includes an absolute value determination unit 60, a frequency counting unit 62, a frequency difference calculation unit 66, an intrusion presence / absence specifying unit 68, and a result information output unit 70. desirable. The absolute value determination unit 60 determines whether the absolute value of the voltage applied to the electric wire 200 and the current flowing through the electric wire 200, which is changed by the power control unit 38, exceeds the threshold and then becomes equal to or lower than the threshold. To do. The number counting unit 62 counts the number of times that the absolute value determining unit 60 has determined that the absolute value of the power control unit 38 has fluctuated but has become less than the threshold after the threshold has been exceeded, in a predetermined period. The frequency difference calculation unit 66 determines the number of times the absolute value determination unit 60 has determined that the absolute value of the power control unit 38 has fluctuated but once has exceeded the threshold and then becomes equal to or less than the threshold, and the power control unit. The difference between the number of fluctuations by 38 and the number in a predetermined period is calculated. The intrusion presence / absence specifying unit 68 specifies information indicating the presence / absence of noise intrusion depending on whether or not the absolute value of the difference calculated by the number-of-times difference calculating unit 66 is equal to or less than a predetermined number of times difference that is a predetermined number of times difference. The result information output unit 70 outputs the information specified by the intrusion presence / absence specifying unit 68 as information representing the inspection result of the presence / absence of noise intrusion.

  The result information output unit 70 outputs the determination result as to whether or not the absolute value of the difference calculated by the number-of-times difference calculation unit 66 is equal to or less than the allowable number of times difference as the inspection result of the presence or absence of noise. As a result, based on the difference described below, a test result indicating whether noise has entered is output. The difference is the number of times the absolute value determination unit 60 has determined that the absolute value has become less than or equal to the threshold after the power control unit 38 has fluctuated, and the variation by the power control unit 38. Is the difference from the number of times in a given period. Based on the difference, a test result indicating whether noise has entered or not is output. Therefore, the power control unit 38 causes a weak fluctuation that does not exceed the threshold among the fluctuations of the power control unit 38 and the power control unit 38. However, it is possible to prevent the test result from being adversely affected by weak fluctuations of the absolute value that once exceeded the threshold and then slightly below the threshold.

  Alternatively, it is desirable that the intrusion presence / absence specifying unit 68 described above includes an allowable number difference storage unit 82, a specific information receiving unit 80, and a specific difference determining unit 84. The allowable frequency difference storage unit 82 stores a plurality of types of allowable frequency differences in advance. The specific information receiving unit 80 receives the frequency difference specifying information. The frequency difference specifying information indicates one of a plurality of types of allowable frequency differences. The specific difference determination unit 84 determines whether or not the absolute value of the difference calculated by the number difference calculation unit 66 is equal to or less than the allowable number difference indicated by the number difference specifying information among a plurality of types of allowable number differences.

  The specific difference determining unit 84 determines whether or not the absolute value of the difference calculated by the number-of-times difference calculating unit 66 is equal to or less than the allowable number of times indicated by the number-of-times difference specifying information among a plurality of types of allowable number of times differences. Thereby, compared with the case where the numerical value representing the allowable number of times is received at any time and the inspection is performed based on the numerical value, the inspection in accordance with the resistance required for the electric wire 200 can be easily realized.

  The electric wire inspection apparatus according to the present invention can detect whether or not the electric wire can withstand the intrusion of noise from the outside.

It is a figure showing the structure of the electric wire inspection apparatus concerning one Embodiment of this invention. It is a figure which shows the wiring in the pair of the electric power supply terminal concerning one Embodiment of this invention. It is a figure which shows the correspondence of each terminal of a power control part, and each terminal of a measurement part in case a certain wire harness concerning one Embodiment of this invention is used. It is a conceptual diagram which shows the hardware constitutions of the control test | inspection part concerning one Embodiment of this invention. It is a flowchart which shows the procedure of control of the electric wire inspection method concerning one Embodiment of this invention. It is a 1st flowchart which shows the procedure of control of the output process concerning one Embodiment of this invention. It is a 2nd flowchart which shows the procedure of control of the output process concerning one Embodiment of this invention. It is a conceptual diagram which shows the waveform of the electric power supplied to the electric power supply terminal concerning one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[Description of configuration of wire inspection device]
Hereinafter, an embodiment of the present invention will be described. FIG. 1 is a diagram illustrating a configuration of an electric wire inspection apparatus 20 according to the present embodiment. Based on FIG. 1, the structure of the electric wire inspection apparatus 20 concerning this embodiment is demonstrated.

  The wire inspection device 20 according to the present embodiment includes a first power supply terminal 30, a second power supply terminal 32, a bypass unit 34, a power supply unit 36, a power control unit 38, a measurement unit 40, and an output unit 42. With.

The one end power supply terminal 30 and the other end power supply terminal 32 are connected to one end and the other end of the wire harness 200 to be inspected before the inspection of the wire harness 200 is started, and after the inspection ends, the wire harness. Ru is removed from the 200. The bypass unit 34 is provided in parallel with the one end power supply terminal 30 and the other end power supply terminal 32. Thereby, even if the wire harness 200 is not connected between the one-end power supply terminal 30 and the other-end power supply terminal 32, it is possible to allow a current to flow between them via the bypass unit 34. In FIG. 1, the bypass portion 34 is indicated by a single line. However, in the case of this embodiment, the bypass part 34 is connected by the many electric wires so that a current can flow between the one end power supply terminal 30 and the other end power supply terminal 32. The power supply unit 36 supplies power to the wire harness 200 through the one end power supply terminal 30 and the other end power supply terminal 32. However, in the case of this embodiment, the electric power supplied to the wire harness 200 has a very small current value. The reason why the current value is negligible is that the signal is identified based on the magnitude of the voltage in the present embodiment. The power control unit 38 controls the magnitude of power supplied to the wire harness 200 via the one end power supply terminal 30 and the other end power supply terminal 32. In the case of the present embodiment, the power control unit 38 controls the magnitude of power by controlling the magnitude of the voltage in the power. The measurement unit 40 is connected to a pair of one end power supply terminal 30 and the other end power supply terminal 32. The measurement unit 40 measures the voltage applied to the wire harness 200. The output unit 42 outputs a test result of whether or not noise has entered the wire harness 200 according to the voltage measured by the measurement unit 40. The power control unit 38 varies the voltage applied to the wire harness 200 a predetermined number of times within a predetermined period. The output unit 42 counts the number of fluctuations. The number of fluctuations is the number of times that the voltage applied to the wire harness 200 has fluctuated within a predetermined period. The output unit 42 outputs a test result of whether or not noise has entered depending on whether or not the number of fluctuations is different from the predetermined number.

  In addition, the noise in this invention means what has influence with respect to the electric power supplied to the wire harness 200. Specific examples of noise include harmonics.

  In the case of this embodiment, the output unit 42 is realized by a known computer. The computer includes a control unit 50, a storage unit 52, an input device 54, a display device 56, and an I / O (Input / Output) 58. The control unit 50 is realized by a CPU (Central Processing Unit) or the like. The control unit 50 executes each program read from the storage unit 52, thereby controlling each device constituting the computer according to a procedure defined in the program. The storage unit 52 is realized by a ROM (Read Only Memory), a RAM (Random Access Memory), or the like. The storage unit 52 stores programs and data. The input device 54 generates a signal in response to an operator input. As a result, information is input to the computer. The display device 56 outputs information by displaying an image. The I / O 58 is connected to the measurement unit 40. The I / O 58 receives a signal output from the measurement unit 40. As a result, the I / O 58 receives the measurement value indicated by the signal.

  FIG. 2 is a diagram illustrating wiring in a pair of power supply terminals according to the present embodiment, that is, one end power supply terminal 30 and the other end power supply terminal 32. Based on FIG. 2, the structure of the bypass part 34 concerning this embodiment is demonstrated. As described above, in the case of the present embodiment, the bypass unit 34 is connected in parallel to the one end power supply terminal 30 and the other end power supply terminal 32 by a number of electric wires. In the case of this embodiment, the one end power supply terminal 30 and the other end power supply terminal 32 have the same number of contacts (not shown). In the case of the present embodiment, the power control unit 38 and the measurement unit 40 have twice as many contacts (not shown) as the one-end power supply terminal 30 and the other-end power supply terminal 32. These contacts are numbered. Each contact is identified by its number. In the case of this embodiment, each contact of the one-end power supply terminal 30 is connected to a contact of the power control unit 38 having the same number as the number assigned to them. Each contact of the other end power supply terminal 32 is connected to the contact of the measuring unit 40 which is given the number described below. The number is equal to the sum of the number given to each contact of the other end power supply terminal 32 and half the number of contacts of the measurement unit 40. For example, in the case of this embodiment, the measurement unit 40 has 128 contacts. Therefore, the terminal labeled “1” among the contacts of the other end power supply terminal 32 is connected to the terminal labeled “65” among the contacts of the measuring unit 40. Further, in the case of the present embodiment, each contact of the power control unit 38 is connected to a contact of the measurement unit 40 having the same number as the number assigned thereto. Since the bypass unit 34 is configured in this manner, the output unit 42 determines whether any of the electric wires constituting the wire harness 200 is disconnected based on the measurement result of the measurement unit 40 or power It can be determined whether power is not supplied from the control unit 38. Moreover, the output part 42 can judge how the electric wire which comprises the wire harness 200 is connected based on the measurement result of the measurement part 40. FIG. FIG. 3 is a diagram illustrating a correspondence relationship between each terminal of the power control unit 38 and each terminal of the measurement unit 40 when a certain wire harness 200 is used. When the wire harness 200 is not connected between the one-end power supply terminal 30 and the other-end power supply terminal 32, power can be supplied via the gap between the one-end power supply terminal 30 and the other-end power supply terminal 32. Can not. Since power cannot be supplied, the power supply terminal 30 at one end and the power supply terminal 32 at the other end are connected via the bypass unit 34. In this case, as shown in the “when the wire harness is not connected” column on the left side of FIG. 3, each contact point of the power control unit 38 has the same number as the number assigned to them. Connected to contact. On the other hand, when the wire harness 200 as shown in FIG. 2 is connected between the one-end power supply terminal 30 and the other-end power supply terminal 32, the wire harness 200 causes the one-end power supply terminal 30 to The terminal labeled “2” and the terminal labeled “3” are connected. Of the other end power supply terminal 32, the terminal labeled “63” and the terminal labeled “64” are connected. Although omitted in FIG. 2, any terminal of the wire harness 200 is electrically connected to any other terminal. As a result, as shown in the “wire harness connected” column on the right side of FIG. 3, each contact of the power control unit 38 is a contact of the measuring unit 40 having the same number as the number assigned thereto. In addition, it is connected to other contacts.

[Explanation of functions of wire inspection device]
FIG. 4 is a functional block diagram of the output unit 42. Based on FIG. 4, the structure and function of the output unit 42 according to the present embodiment will be described. The control unit 50, the storage unit 52, the input device 54, the display device 56, and the I / O 58 of the computer described above constitute the output unit 42 of the wire inspection device 20.

  The output unit 42 includes an absolute value determination unit 60, a number counting unit 62, an end detection unit 64, a number difference calculation unit 66, an intrusion presence / absence specifying unit 68, and a result information output unit 70. The absolute value determination unit 60 determines whether the power control unit 38 has changed, that is, whether or not the absolute value of the voltage applied to the wire harness 200 has exceeded the threshold value and has become equal to or less than the threshold value. The number counting unit 62 counts the number of times that the absolute value determining unit 60 has determined that the absolute value of the power control unit 38 has fluctuated but has become less than the threshold after the threshold has been exceeded, in a predetermined period. The frequency difference calculation unit 66 determines the number of times the absolute value determination unit 60 has determined that the absolute value of the power control unit 38 has fluctuated but once has exceeded the threshold and then becomes equal to or less than the threshold, and the power control unit. The difference between the number of fluctuations by 38 and the number in a predetermined period is calculated. The intrusion presence / absence specifying unit 68 determines whether or not the difference calculated by the number-of-times difference calculating unit 66 is equal to or less than an allowable number of times difference that is a predetermined number of times difference. The result information output unit 70 outputs the result determined by the intrusion presence / absence specifying unit 68 as the inspection result of the presence / absence of noise intrusion.

  The intrusion presence / absence specifying unit 68 includes a specific information receiving unit 80, an allowable number of times difference storage unit 82, and a specific difference determination unit 84. The specific information receiving unit 80 receives the frequency difference specifying information. The frequency difference specifying information indicates one of a plurality of types of allowable frequency differences. The allowable frequency difference storage unit 82 stores a plurality of types of allowable frequency differences in advance. The specific difference determining unit 84 determines whether or not the difference calculated by the number-of-times difference calculating unit 66 is equal to or less than the allowable number of times difference indicated by the number-of-times difference specifying information among a plurality of types of allowable number of times difference.

[Explanation of flowchart]
FIG. 5 is a flowchart showing a control procedure of the electric wire inspection method according to the present embodiment. As shown in FIG. 5, this program causes the above-described computer to execute a plurality of steps described below. The plurality of steps are a terminal connection step S200, a power control step S202, a measurement step S204, and an output step S206. As a result of executing the program, the computer implements the electric wire inspection method including the plurality of steps. Hereinafter, the specific content of each of these processes is demonstrated.

  In the terminal connection step S200, the inspector connects one end and the other end of the wire harness 200 to be inspected to one end and the other of the one end power supply terminal 30 and the other end power supply terminal 32.

  In the power control step S202, the predetermined wire inspection device 20 controls the magnitude of the power supplied to the wire harness 200 from the one end power supply terminal 30 and the other end power supply terminal 32. In the case of the present embodiment, the power control unit 38 of the wire inspection device 20 determines the voltage applied to the wire harness 200, that is, the voltage applied between the one end power supply terminal 30 and the other end power supply terminal 32 within a predetermined period. Fluctuate times.

  In the measurement step S <b> 204, the measurement unit 40 of the wire inspection device 20 measures the voltage applied to the wire harness 200.

  In the output step S206, the electric wire inspection device 20 outputs the inspection result of whether or not noise has entered the wire harness 200 according to the voltage measured in the measurement step S204. Therefore, in the electric wire inspection apparatus 20, the output part 42 counts the frequency | count of fluctuation | variation which is the frequency | count that the voltage applied to the wire harness 200 fluctuated within the predetermined period. The output unit 42 outputs a test result of whether or not noise has entered depending on whether or not the number of fluctuations is different from the predetermined number.

  FIG. 6 is a first flowchart showing a control procedure of the output step S206 according to the present embodiment. FIG. 7 is a second flowchart showing the control procedure of the output step S206 according to the present embodiment. Based on FIG. 6 and FIG. 7, the control procedure of the output step S206 according to the present embodiment will be described. In the case of the present embodiment, the output step S206 includes an absolute value determination step S220, a number counting step S222, an end determination step S224, a number difference calculation step S226, an intrusion presence / absence identification step S228, and a result information output step S230. have.

  In the absolute value determination step S220, the absolute value determination unit 60 determines whether or not the absolute value of the voltage applied to the wire harness 200 once falls below the threshold after exceeding the threshold. If the absolute value of the voltage once exceeds the threshold and then becomes equal to or lower than the threshold (YES in S220), the process proceeds to S222. If not (NO in S220), the process proceeds to S224.

  In the number counting step S222, the number counting unit 62 increments the number of times that the absolute value determining unit 60 determines that the absolute value of the voltage once exceeds the threshold value and then becomes equal to or less than the threshold value by “1”. .

  In the end determination step S224, the end detection unit 64 determines whether or not a period during which power is supplied to the wire harness 200 (supply period) has elapsed. If it is determined that the supply period has elapsed (YES in S224), the process proceeds to the number difference calculation step S226. If not (NO in S224), the process proceeds to absolute value determination step S220.

  In the number difference calculation step S226, the number difference calculation unit 66 determines the number of times in a predetermined period and the power control unit 38 that the absolute value determination unit 60 determines that the absolute value of the voltage once exceeds the threshold and then becomes equal to or less than the threshold. A difference from the number of fluctuations in a predetermined period is calculated.

  In the intrusion presence / absence identification step S228, the intrusion presence / absence identification unit 68 identifies information indicating the presence or absence of noise intrusion according to whether or not the difference calculated by the number-of-times difference calculation unit 66 is equal to or less than an allowable number of times difference that is a predetermined number of times difference. To do. The intrusion presence / absence specifying step S228 includes a frequency difference selecting step S240, a specific difference determining step S242, an intrusion information specifying step S244, and a non-intrusion information specifying step S246. In the number difference selection step S240, the specific difference determination unit 84 selects an allowable number difference used for determination described later from among a plurality of types of allowable number differences stored in advance by the allowable number difference storage unit 82. The allowable number of times difference is selected based on the number of times difference specifying information received in advance. The number difference specifying information is received by the specifying information receiving unit 80. In the specific difference determination step S242, the specific difference determination unit 84 determines whether the absolute value of the difference calculated by the number difference calculation unit 66 in the number difference calculation step S226 is selected by the specific difference determination unit 84 in the number difference selection step S240. Determine if it is less than or equal to the difference. When it is determined that the absolute value of the difference calculated by the frequency difference calculating unit 66 in the frequency difference calculating step S226 is equal to or less than the allowable frequency difference selected by the specific difference determining unit 84 in the frequency difference selecting step S240 (YES in S242). The process proceeds to intrusion information specifying step S244. If not (NO in S242), the process proceeds to the non-intrusion information specifying step S246. In the intrusion information specifying step S244, the result information setting unit 86 sets information indicating whether or not noise has entered the wire harness 200 as “none”. In the non-intrusion information specifying step S246, the result information setting unit 86 sets “present” as information indicating whether or not noise has entered the wire harness 200.

  In the result information output step S230, the result information output unit 70 outputs the information set by the result information setting unit 86 as “present” or “not present” as information indicating the inspection result of the presence or absence of noise.

[Description of operation]
(When there is no noise intrusion)
The inspector connects one end and the other end of the wire harness 200 to be inspected to one and the other of the one end power supply terminal 30 and the other end power supply terminal 32 (S200). When these are completed, the power control unit 38 controls the voltage applied between the one end power supply terminal 30 and the other end power supply terminal 32. As a result, the voltage is varied a predetermined number of times within a predetermined period (S202). As a result, it is assumed that the voltage fluctuates so as to form the waveform shown in FIG. The measuring unit 40 measures the voltage (S204). In this case, since noise does not enter the wire harness 200, the waveform of the voltage measured by the measurement unit 40 is the same as that shown in FIG. When the voltage is measured by the measuring unit 40, the absolute value determining unit 60 determines whether or not the absolute value of the voltage applied to the wire harness 200 once falls below the threshold value after exceeding the threshold value (S220). In the case of the present embodiment, it is assumed that the voltage indicated by a broken line in FIG. If there is no noise intrusion, the absolute value of the voltage applied to the wire harness 200 once exceeds the threshold value and then becomes equal to or less than the threshold value (YES in S220). 1 "is increased (S222). The number is the number of times that the absolute value determination unit 60 determines that the absolute value of the voltage applied to the wire harness 200 once falls below the threshold value after exceeding the threshold value in a predetermined period. When the number increases by “1”, the end detection unit 64 determines whether the supply period has passed (S224). In this case, since the supply period has not yet elapsed (NO in S224), the processes after absolute value determination step S220 are repeated. After that, when the supply period elapses (YES in S224), the frequency difference calculation unit 66 sets the number of times that the absolute value of the voltage applied to the wire harness 200 in the supply period once exceeded the threshold and became equal to or less than the threshold. The difference from the number of times by the power control unit 38 is calculated (S226). In this case, since the waveform of the voltage measured by the measuring unit 40 is the same as that shown in FIG. 8A, the difference calculated by the number-of-times difference calculating unit 66 is “0”. When the difference is calculated, the specific difference determination unit 84 selects the allowable number of times difference from the plural types of allowable number of times stored in advance by the allowable number of times difference storage unit 82 (S240). In this case, the allowable number of times difference is “0”. When the allowable number difference is selected, the specific difference determination unit 84 determines whether or not the difference calculated by the number difference calculation unit 66 in the number difference calculation step S226 is equal to or less than the allowable number difference of “0” (S242). In this case, since the difference “0” calculated by the number difference calculation unit 66 in the number difference calculation step S226 is equal to the allowable number difference (YES in S242), the result information setting unit 86 causes noise intrusion to the wire harness 200. Information indicating presence / absence is set to “none” (S244). When the information indicating the presence / absence of noise intrusion is set to “none”, the result information output unit 70 sets the information set by the result information setting unit 86 to “none” to indicate the inspection result of the presence / absence of noise intrusion. (S230).

(In case of noise intruding voltage fluctuations)
One end and the other end of the wire harness 200 are connected (S200), and the voltage is varied a predetermined number of times within a predetermined period by the power control unit 38 (S202). As a result, the voltage is shown in FIG. Suppose that it fluctuates so as to form the waveform shown in FIG. The measuring unit 40 measures the voltage (S204). In this case, noise that impairs the fluctuation of the voltage enters the wire harness 200, so that the voltage waveform measured by the measurement unit 40 is the same as that shown in FIG. 8B. When the voltage is measured by the measuring unit 40, the absolute value determining unit 60 determines whether or not the absolute value of the voltage applied to the wire harness 200 once falls below the threshold value after exceeding the threshold value (S220). In the case of the present embodiment, it is assumed that the voltage indicated by the broken line in FIG. When the absolute value of the voltage applied to wire harness 200 once exceeds the threshold and then becomes equal to or lower than the threshold (YES in S220), frequency counting unit 62 increases the number described next by “1” (S222). ). The number is the number of times that the absolute value determination unit 60 determines that the absolute value of the voltage applied to the wire harness 200 once falls below the threshold value after exceeding the threshold value in a predetermined period. When the number increases by “1”, the end detection unit 64 determines whether the supply period has passed (S224). In this case, since the supply period has not yet elapsed (NO in S224), absolute value determination unit 60 determines whether or not the absolute value of the voltage applied to wire harness 200 once falls below the threshold after exceeding the threshold. Is determined (S220). If the absolute value of the voltage applied to wire harness 200 does not exceed the threshold value (NO in S220), end detection unit 64 determines whether the supply period has elapsed (S224). In this case, since the supply period has not yet elapsed (NO in S224), the processes after absolute value determination step S220 are repeated. After that, when the supply period elapses (YES in S224), the frequency difference calculation unit 66 sets the number of times that the absolute value of the voltage applied to the wire harness 200 in the supply period once exceeded the threshold and became equal to or less than the threshold. The difference from the number of times by the power control unit 38 is calculated (S226). In this case, as described above, the waveform of the voltage measured by the measurement unit 40 is the same as that shown in FIG. 8B, so the difference calculated by the number-of-times difference calculation unit 66 is “−1”. It becomes. When the difference is calculated, the specific difference determination unit 84 selects the allowable number of times difference from the plural types of allowable number of times stored in advance by the allowable number of times difference storage unit 82 (S240). In this case, the allowable number of times difference is “0”. When the allowable number difference is selected, the specific difference determination unit 84 determines whether or not the absolute value of the difference calculated by the number difference calculation unit 66 in the number difference calculation step S226 is equal to or less than the allowable number difference of “0” ( S242). In this case, since the absolute value “1” of the difference calculated by the number difference calculation unit 66 in the number difference calculation step S226 is larger than the allowable number difference (NO in S242), the result information setting unit 86 determines whether the noise to the wire harness 200 Is set to “present” (S246). When the information indicating the presence / absence of noise intrusion is set as “present”, the result information output unit 70 sets the information set by the result information setting unit 86 as “present” to the information indicating the inspection result of the presence / absence of noise intrusion. (S230).

(In case of noise invading voltage fluctuation that should not exist)
One end and the other end of the wire harness 200 are connected (S200), and the voltage is varied a predetermined number of times within a predetermined period by the power control unit 38 (S202). As a result, the voltage is shown in FIG. Suppose that it fluctuates so as to form the waveform shown in FIG. The measuring unit 40 measures the voltage (S204). In this case, since noise invading voltage that should not originally exist enters, the waveform of the voltage measured by the measurement unit 40 is the same as that shown in FIG. 8C. When the voltage is measured by the measuring unit 40, the absolute value determining unit 60 determines whether or not the absolute value of the voltage applied to the wire harness 200 once falls below the threshold value after exceeding the threshold value (S220). Thereafter, the processing from S220 to S224 is repeated. After that, when the supply period elapses (YES in S224), the frequency difference calculation unit 66 sets the number of times that the absolute value of the voltage applied to the wire harness 200 in the supply period once exceeded the threshold and became equal to or less than the threshold. The difference from the number of times by the power control unit 38 is calculated (S226). In this case, as described above, noise invading voltage that should not originally exist enters, so the waveform of the voltage measured by the measurement unit 40 is the same as that shown in FIG. 8C. become. As a result, the difference calculated by the number difference calculation unit 66 is “+1”. When the difference is calculated, the specific difference determination unit 84 selects the allowable number of times difference from the plural types of allowable number of times stored in advance by the allowable number of times difference storage unit 82 (S240). In this case, the allowable number of times difference is “0”. When the allowable number difference is selected, the specific difference determination unit 84 determines whether or not the absolute value of the difference calculated by the number difference calculation unit 66 in the number difference calculation step S226 is equal to or less than the allowable number difference of “0” ( S242). In this case, since the absolute value “1” of the difference calculated by the number difference calculation unit 66 in the number difference calculation step S226 is larger than the allowable number difference (NO in S242), the result information setting unit 86 determines whether the noise to the wire harness 200 Is set to “present” (S246). When the information indicating the presence / absence of noise intrusion is set as “present”, the result information output unit 70 sets the information set by the result information setting unit 86 as “present” to the information indicating the inspection result of the presence / absence of noise intrusion. (S230).

[Description of effects]
According to the electric wire inspection apparatus 20 according to the present embodiment, it is possible to detect whether or not the wire harness 200 can withstand the intrusion of noise from the outside.

  The embodiments disclosed herein are illustrative in all respects. The scope of the present invention is not limited based on the above-described embodiment. Of course, various design changes may be made without departing from the spirit of the present invention.

  For example, the configuration of the intrusion presence / absence specifying unit 68 is not limited to that described above. Further, the allowable number of times used for determination by the intrusion presence / absence specifying unit 68 may be one type.

  Further, the number of fluctuations counted by the output unit 42 may be the number of fluctuations in the current flowing through the wire harness 200. In that case, the power control unit 38 controls the magnitude of the power by controlling the magnitude of the current out of the power supplied to the wire harness 200 from the one end power supply terminal 30 and the other end power supply terminal 32. It will be. The measuring unit 40 will measure the current flowing through the wire harness 200.

DESCRIPTION OF SYMBOLS 20 ... Electric wire inspection apparatus 30 ... One end power supply terminal 32 ... Other end power supply terminal 34 ... Bypass part 36 ... Power supply part 38 ... Power control part 40 ... Measurement part 42 ... Output part 50 ... Control part 52 ... Memory | storage part 54 ... Input Device 56 ... Display device 58 ... I / O
60 ... Absolute value determination unit 62 ... Count counting unit 64 ... End detection unit 66 ... Count difference calculation unit 68 ... Intrusion presence / absence specifying unit 70 ... Result information output unit 80 ... Specific information receiving unit 82 ... Allowable frequency difference storage unit 84 ... Specific Difference determination unit 86 ... Result information setting unit 200 ... Wire harness

Claims (3)

A pair of power supply terminals are connected before the start of the inspection of the electric wire to the electric wire Ru removed from the wire after completion of the test is a test of the subject,
A power supply for supplying power to the wire via the pair of power supply terminals;
A power control unit for controlling the magnitude of power supplied to the electric wire from the pair of power supply terminals;
A measuring unit connected to the pair of power supply terminals and measuring at least one of a voltage applied to the electric wire and a current flowing through the electric wire;
An electric wire inspection apparatus comprising: an output unit that outputs an inspection result of whether or not noise has entered the electric wire according to at least one of the voltage and the current measured by the measuring unit;
The power control unit varies at least one of a voltage applied to the electric wire and a current flowing through the electric wire a predetermined number of times within a predetermined period,
The output unit counts the number of fluctuations, which is the number of times the power control unit fluctuated among the voltage applied to the electric wire and the current flowing through the electric wire, and the number of fluctuations within the predetermined period; and An electric wire inspection apparatus that outputs an inspection result of the presence or absence of the noise depending on whether or not the number of fluctuations is different from the predetermined number. The output unit is
An absolute value determination unit for determining whether the absolute value of the voltage applied to the electric wire and the current flowing through the electric wire has changed by the power control unit once exceeds a threshold value, or not,
Although the power control unit is varied, the number counting unit that counts the number of times that the absolute value determination unit determines that the absolute value is equal to or less than the threshold after once exceeding the threshold, in the predetermined period;
Although the power control unit fluctuates, the number of times the absolute value determination unit determines that the absolute value has become equal to or less than the threshold value once exceeds the threshold value, and the variation by the power control unit. A number difference calculation unit for calculating a difference between the number of times and the number in the predetermined period;
An intrusion presence / absence specifying unit that specifies information indicating the presence / absence of intrusion of the noise according to whether or not the absolute value of the difference calculated by the number of times difference calculation unit is a predetermined number of times difference or less,
The electric wire inspection apparatus according to claim 1, further comprising: a result information output unit that outputs the information specified by the intrusion presence / absence specifying unit as information representing an inspection result of the presence / absence of noise intrusion. The intrusion presence / absence specifying unit
An allowable number of times difference storage unit that stores in advance a plurality of types of allowable number of times difference;
A specific information receiving unit that receives number-of-times difference specifying information indicating any of the plurality of types of allowable number of times;
A specific difference determining unit that determines whether or not the absolute value of the difference calculated by the number of times difference calculating unit is equal to or less than the allowable number of times difference indicated by the number of times difference specifying information among the plurality of types of allowable number of times difference The electric wire inspection apparatus according to claim 2.

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