Wire harness fault detection method and fault detection equipment based on time domain reflection

Abstract

The invention relates to the technical field of signal processing, and discloses a wire harness fault detection method and fault detection equipment based on time domain reflection, and the method comprises the steps: reading the signal edge order difference of a target detection signal when the signal processing module receives the target detection signal aiming at the detected equipment wire harness, thereby obtaining the fault detection result based on the time domain reflection principle; according to the signal edge order difference, calculating a fault position of the tested equipment wire harness; fault point positioning is carried out on the tested equipment wire harness according to the fault position through a three-dimensional engine module, and the three-dimensional fault position of the tested equipment wire harness is obtained; and according to the waveform detection data corresponding to the target detection signal, the fault type of the fault position is analyzed, the target detection signal is obtained by fusing the initial detection signal and an echo signal thereof, and the echo signal indicates that the detected equipment wire harness has a fault. Therefore, the detection efficiency of the wire harness fault can be improved, and the positioning precision of the wire harness fault point can be improved by performing three-dimensional positioning on the fault point.

Description

Technical Field

[0001] This invention relates to the field of signal processing technology, and in particular to a method and device for detecting wire harness faults based on time-domain reflection. Background Technology

[0002] Currently, fault detection of electrical wiring harnesses in construction machinery mainly relies on manual methods using tools such as multimeters and ammeters to measure electrical signals such as current, voltage, and resistance of the wiring harness, thereby determining whether faults such as short circuits, open circuits, and grounding have occurred in the wiring harness.

[0003] In practice, existing fault detection methods for electrical harnesses in engineering machinery aim to ensure the accuracy of fault detection results (such as fault location and / or fault type) by measuring the electrical signals at both ends of the harness, or to ensure ease of operation by using the time-domain reflection principle to measure the fault distance at one end.

[0004] However, practical experience has shown that measuring the electrical signals at both ends of the wire harness to ensure the accuracy of fault detection results requires sending and receiving signals at both ends, which is inconvenient and inefficient. While using the time-domain reflectometry principle to measure the fault distance at one end ensures ease of operation, it can only determine the length distance between the fault point and the measurement point, resulting in low positioning accuracy. Therefore, proposing a technical solution to improve the efficiency of wire harness fault detection and the positioning accuracy of wire harness fault points is particularly important. Summary of the Invention

[0005] This invention provides a wire harness fault detection method and fault detection device based on time-domain reflection, which can improve the efficiency of wire harness fault detection and also improve the positioning accuracy of wire harness fault points.

[0006] The first aspect of this invention discloses a wire harness fault detection method based on time-domain reflectometry. The method is applied to a fault detection device, which includes at least a signal processing module and a 3D engine module. The method includes: Upon receiving a target detection signal for the wiring harness of the device under test, the signal processing module reads the signal edge step difference of the target detection signal; The signal processing module calculates the fault location of the device under test wiring harness based on the preset time-domain reflection principle and the signal edge step difference; and through the three-dimensional engine module, it locates the fault point of the device under test wiring harness based on the fault location of the device under test wiring harness to obtain the three-dimensional fault location of the device under test wiring harness. The signal processing module analyzes the fault type of the wiring harness of the device under test based on the waveform detection data corresponding to the target detection signal. The target detection signal is obtained by fusing the initial detection signal for the wiring harness of the device under test and the echo signal corresponding to the initial detection signal. The echo signal is used to indicate that the wiring harness of the device under test has failed.

[0007] As an optional implementation, in the first aspect of the present invention, the fault detection device further includes: a signal acquisition module; The method further includes: If the wiring harness of the device under test generates an echo signal under the detection of the initial detection signal, the signal acquisition module acquires the target detection signal obtained by fusing the initial detection signal and the echo signal, and sends the target detection signal to the signal processing module.

[0008] As an optional implementation, in a first aspect of the present invention, the fault detection device further includes: a signal generation module; The method further includes: The signal generation module sends the initial detection signal to one end of the wiring harness of the device under test, so as to detect whether there is an impedance mismatch point in the wiring harness of the device under test through the initial detection signal, and generates the echo signal when the impedance mismatch point in the wiring harness of the device under test is detected. Specifically, when the impedance mismatch point is not present in the wiring harness of the device under test, it indicates that the wiring harness of the device under test is not faulty; when the impedance mismatch point is present in the wiring harness of the device under test, it indicates that the wiring harness of the device under test has failed.

[0009] As an optional implementation, in a first aspect of the present invention, a fault database module; The signal processing module analyzes the fault type of the wiring harness of the device under test based on the waveform detection data corresponding to the target detection signal, including: The signal processing module inputs the waveform detection data corresponding to the target detection signal into the fault database module for classification to obtain the fault type of the wire harness of the device under test.

[0010] As an optional implementation, in a first aspect of the present invention, the fault detection device further includes: a display module; The method further includes: The signal processing module provides the three-dimensional fault location of the wire harness under test to the display module, so that the display module displays the three-dimensional fault location of the wire harness under test.

[0011] As an optional implementation, in a first aspect of the present invention, the method further includes: The signal processing module inputs the fault type of the wiring harness of the device under test into the fault database module for matching, and obtains a troubleshooting and processing solution that matches the fault type; The signal processing module provides the display module with a troubleshooting solution that matches the fault type, so that the display module displays the fault type of the wire harness of the device under test and the troubleshooting solution that matches the fault type.

[0012] As an optional implementation, in a first aspect of the present invention, the signal processing module, through the three-dimensional engine module, locates the fault point of the wire harness under test according to the fault location of the wire harness under test, and obtains the three-dimensional fault location of the wire harness under test, including: The signal processing module acquires the three-dimensional data of the wire harness of the device under test from the three-dimensional engine module; The signal processing module locates the fault point of the wire harness under test based on the fault location and the three-dimensional data of the wire harness under test, thereby obtaining the three-dimensional fault location of the wire harness under test.

[0013] As an optional implementation, in a first aspect of the present invention, the fault detection device further includes: a power supply module; The method further includes: The power supply module directly or indirectly supplies the first power supply within the power supply module to the target module within the fault detection device, the target module including at least the signal processing module; and / or When receiving an external power source, the power supply module converts the external power source into a second power supply, which is used to directly or indirectly power the target module within the fault detection device.

[0014] A second aspect of the present invention discloses a fault detection device, the fault detection device comprising at least a signal processing module and a 3D engine module, wherein the signal processing module is used for: Upon receiving a target detection signal for the wiring harness of the device under test, the signal edge difference of the target detection signal is read. Based on the preset time-domain reflection principle, the fault location of the device under test wiring harness is calculated according to the signal edge step difference; and through the three-dimensional engine module, the fault point of the device under test wiring harness is located according to the fault location of the device under test wiring harness to obtain the three-dimensional fault location of the device under test wiring harness. Based on the waveform detection data corresponding to the target detection signal, analyze the fault type of the wiring harness of the device under test; The target detection signal is obtained by fusing the initial detection signal for the wiring harness of the device under test and the echo signal corresponding to the initial detection signal. The echo signal is used to indicate that the wiring harness of the device under test has failed.

[0015] As an optional implementation, in a second aspect of the present invention, the fault detection device further includes: a signal acquisition module; The signal acquisition module is used to acquire the target detection signal obtained by fusing the initial detection signal and the echo signal if the wiring harness of the device under test generates an echo signal under the detection action of the initial detection signal, and send the target detection signal to the signal processing module.

[0016] As an optional implementation, in a second aspect of the present invention, the fault detection device further includes: a signal generation module; The signal generation module is used to send the initial detection signal to one end of the wiring harness of the device under test, so as to detect whether there is an impedance mismatch point in the wiring harness of the device under test through the initial detection signal, and generate the echo signal when the impedance mismatch point in the wiring harness of the device under test is detected. Specifically, when the impedance mismatch point is not present in the wiring harness of the device under test, it indicates that the wiring harness of the device under test is not faulty; when the impedance mismatch point is present in the wiring harness of the device under test, it indicates that the wiring harness of the device under test has failed.

[0017] As an optional implementation, in a second aspect of the present invention, the fault detection device further includes: a fault database module; The fault database module is configured to receive waveform detection data corresponding to the target detection signal input by the signal processing module, classify the target detection signal according to the waveform detection data to obtain the fault type of the wire harness under test, and output the fault type of the wire harness under test to the signal processing module.

[0018] As an optional implementation, in a second aspect of the present invention, the fault detection device further includes: a display module; The display module is used to display the three-dimensional fault location of the wire harness of the device under test sent by the signal processing module.

[0019] As an optional implementation, in a second aspect of the present invention, the signal processing module is further configured to input the fault type of the wire harness under test into the fault database module for matching, to obtain a troubleshooting and processing scheme that matches the fault type; and to provide the troubleshooting and processing scheme that matches the fault type to the display module, so that the display module displays the fault type of the wire harness under test and the troubleshooting and processing scheme that matches the fault type.

[0020] As an optional implementation, in a second aspect of the present invention, the signal processing module, through the three-dimensional engine module, locates the fault point of the wire harness under test based on the fault location of the wire harness under test, and obtains the three-dimensional fault location of the wire harness under test by specifically including: The signal processing module acquires the three-dimensional data of the wire harness of the device under test from the three-dimensional engine module; The signal processing module locates the fault point of the wire harness under test based on the fault location and the three-dimensional data of the wire harness under test, thereby obtaining the three-dimensional fault location of the wire harness under test.

[0021] As an optional implementation, in a second aspect of the present invention, the fault detection device further includes: a power supply module; The power supply module is configured to directly or indirectly supply a first power supply within the power supply module to a target module within the fault detection device, the target module including at least the signal processing module; and, upon receiving an external power supply, convert the external power supply into a second power supply, the second power supply being used to directly or indirectly supply power to the target module within the fault detection device.

[0022] A third aspect of the present invention discloses another fault detection device, the fault detection device comprising a device body and a wire harness fault detection apparatus; wherein the wire harness fault detection apparatus is used to perform a wire harness fault detection method based on time-domain reflection as described in any of the first aspects of the present invention.

[0023] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a fault detection device for implementing a wire harness fault detection process, comprising at least a signal processing module and a 3D engine module. Specifically, the signal processing module receives a detection signal for the wire harness under test. Upon receiving a target detection signal obtained by fusing the initial detection signal and its echo signal, it reads the signal edge difference of the target detection signal. Based on a preset time-domain reflection principle, it calculates the fault location of the wire harness under test according to the signal edge difference. The 3D engine module then locates the fault point in the wire harness based on its fault location to obtain the 3D fault location. Furthermore, it analyzes the fault type of the wire harness based on the waveform detection data corresponding to the target detection signal. Therefore, this invention can calculate the fault location of the wire harness under test using the time-domain reflection principle, ensuring ease of operation for wire harness fault detection and improving the efficiency and accuracy of fault location detection. It also improves the positioning accuracy of fault points through 3D fault point localization and enhances the efficiency and accuracy of fault type detection by analyzing the waveform detection data corresponding to the target detection signal. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a flowchart illustrating a wire harness fault detection method based on time-domain reflection disclosed in an embodiment of the present invention. Figure 2 This is a flowchart illustrating another wire harness fault detection method based on time-domain reflection disclosed in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a fault detection instrument disclosed in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a fault detection device disclosed in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of another fault detection device disclosed in an embodiment of the present invention; Figure 6 This is a structural schematic diagram of another fault detection device disclosed in an embodiment of the present invention; Figure 7 This is a structural schematic diagram of another fault detection device disclosed in an embodiment of the present invention. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, product, or end that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or ends.

[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] This invention discloses a wire harness fault detection method and device based on time-domain reflection. It can calculate the signal edge step difference of the target detection signal using the time-domain reflection principle to obtain the fault location of the wire harness under test, ensuring ease of operation in detecting wire harness faults and improving the detection efficiency and accuracy. Furthermore, it can improve the positioning accuracy of the fault point by performing three-dimensional localization, and analyze the fault type of the wire harness under test using the waveform detection data corresponding to the target detection signal, thus improving the detection efficiency and accuracy of wire harness fault types. These will be described in detail below.

[0030] Example 1 Please see Figure 1 , Figure 1 This is a flowchart illustrating a wire harness fault detection method based on time-domain reflection disclosed in an embodiment of the present invention. Wherein, Figure 1 The described time-domain reflectometry-based wire harness fault detection method can be applied to fault detection equipment. The fault detection equipment includes at least a signal processing module and a 3D engine module, and can be used to detect faults in any wire harness of the device under test. This embodiment of the invention does not limit the specific wire harness of the device under test. Figure 1As shown, the wire harness fault detection method based on time-domain reflection may include the following steps: 101. When a target detection signal is received for the wiring harness of the device under test, the signal processing module reads the signal edge step difference of the target detection signal.

[0031] In this embodiment of the invention, optionally, the wiring harness of the device under test can be the wiring harness of engineering machinery equipment such as hydraulic excavators and loaders, and this embodiment of the invention does not limit it.

[0032] In this embodiment of the invention, the target detection signal is obtained by fusing the initial detection signal for the wiring harness of the device under test and the echo signal corresponding to the initial detection signal. Optionally, the initial detection signal can be a pulse signal or a step signal, and the echo signal is used to indicate that the wiring harness of the device under test has failed; this embodiment of the invention does not impose any limitations.

[0033] Specifically, the initial detection signal propagates in the wiring harness of the device under test. When it encounters an impedance mismatch point (such as a short circuit, open circuit, grounding, etc.) in the wiring harness, an echo signal is generated. The impedance mismatch point is used to indicate the location where a fault has occurred in the wiring harness of the device under test.

[0034] Specifically, the signal processing module receives the detection signal for the wiring harness of the device under test. When the received detection signal is the initial detection signal mentioned above, it is determined that the wiring harness of the device under test has not been faulted, and the process can end at this time. When the received detection signal is the target detection signal obtained by fusing the initial detection signal and the echo signal, it is determined that the wiring harness of the device under test has been faulted. At this time, the signal processing module performs the operation of reading the signal edge step difference of the target detection signal in step 101.

[0035] 102. The signal processing module calculates the fault location of the wire harness of the device under test based on the preset time-domain reflection principle and the signal edge step difference.

[0036] In this embodiment of the invention, the difference in signal edge steps can be used to characterize the time difference between the time of transmitting the initial detection signal and the time of receiving the echo signal.

[0037] In this embodiment of the invention, the time-domain reflection principle is as follows: by sending a pulse or step signal to the medium under test, an echo is generated when the impedance of the medium changes, and the remaining electromagnetic energy continues to travel in the medium. The impedance change is calculated by comparing the amplitude of the incident wave and the amplitude of the reflected wave, and the location information of the impedance change point is obtained based on the time difference. Specifically, the signal processing module, based on the time-domain reflection principle, calculates the distance between the transmission point of the initial detection signal and the impedance mismatch point of the wire harness under test according to the signal edge step difference, obtaining the fault distance of the impedance mismatch point. Then, based on the location of the transmission point and the fault distance of the impedance mismatch point, an inverse operation is performed to obtain the location of the impedance mismatch point, which is used as the fault location of the wire harness under test.

[0038] 103. The signal processing module, through the 3D engine module, locates the fault point of the wire harness under test based on the fault location of the wire harness under test, and obtains the 3D fault location of the wire harness under test.

[0039] In this embodiment of the invention, the data source of the 3D engine module is the 3D data during the design and finalization of the engineering machinery (the 3D data corresponds one-to-one with the model of the equipment under test). By importing the design data from the 3D software into the 3D engine module, the accuracy of fault location can be guaranteed.

[0040] 104. The signal processing module analyzes the fault type of the wiring harness of the device under test based on the waveform detection data corresponding to the target detection signal.

[0041] In this embodiment of the invention, the fault type may optionally include one of the following: short circuit, open circuit, grounding, etc., and this embodiment of the invention does not limit the type.

[0042] In this embodiment of the invention, optionally, the fault detection device may further include a storage module, which can be used to store the initial detection signal for any wire harness under test, and to store the target detection signal for any wire harness under test and its corresponding fault detection result. Optionally, the fault detection result may include at least one or more combinations of the fault location of the corresponding wire harness under test, the three-dimensional fault location of the corresponding wire harness under test, and the fault type of the corresponding wire harness under test. Further optionally, the fault detection result may also include a troubleshooting and processing scheme matching the fault type of the corresponding wire harness under test; however, this embodiment of the invention does not impose limitations on this.

[0043] It is evident that implementation Figure 1The described wire harness fault detection method based on time-domain reflection can calculate the signal edge step difference of the target detection signal to obtain the fault location of the wire harness under test, thus ensuring the ease of operation of wire harness fault detection and improving the detection efficiency and accuracy of wire harness fault location. Furthermore, it can improve the positioning accuracy of the wire harness fault point by performing three-dimensional positioning of the fault point, and can analyze the fault type of the wire harness under test through the waveform detection data corresponding to the target detection signal, which is beneficial to improving the detection efficiency and accuracy of wire harness fault type.

[0044] In an optional embodiment, the fault detection device further includes a signal acquisition module. The method may also include: If the wiring harness of the device under test generates an echo signal under the detection of the initial detection signal, the signal acquisition module acquires the target detection signal obtained by fusing the initial detection signal and the echo signal, and sends the target detection signal to the signal processing module.

[0045] In this embodiment of the invention, the initial detection signal travels through the signal transmission channel of the wiring harness of the device under test. When the signal encounters an impedance mismatch point in the wiring harness, it cannot continue to travel without loss along the original channel. As a result, a portion of the echo signal is generated, and the signal acquisition module (such as an oscilloscope) can then acquire the new signal.

[0046] As can be seen, this optional embodiment can acquire target detection signals for the wire harness of the device under test through the signal acquisition module and send them to the signal processing module, so as to realize the rapid and accurate reception of the target detection signals by the signal processing module. This is beneficial to improving the accuracy, efficiency and timeliness of the signal processing module in detecting target detection signals, thereby improving the accuracy, efficiency and timeliness of the signal processing module in detecting faults in the wire harness of the device under test.

[0047] In this optional embodiment, as an optional implementation, the fault detection device further includes a signal generation module. The method further includes: The signal generation module sends an initial detection signal to one end of the wiring harness of the device under test (DUT) to detect whether there is an impedance mismatch point in the DUT wiring harness, and generates an echo signal when an impedance mismatch point is detected in the DUT wiring harness.

[0048] When there is no impedance mismatch point in the wiring harness of the device under test, it indicates that the wiring harness of the device under test is not faulty, and no echo signal is generated. When there is an impedance mismatch point in the wiring harness of the device under test, it indicates that the wiring harness of the device under test has been faulty, and an echo signal is generated.

[0049] In this embodiment of the invention, when the signal generation module sends the initial detection signal to one end of the wiring harness of the device under test, the signal acquisition module can simultaneously acquire the initial detection signal and detect the reflected waveform of the initial detection signal, thereby facilitating the subsequent signal processing module to compare the reflected waveform of the initial detection signal sent by the signal acquisition module with the waveform detection data of the target detection signal.

[0050] As can be seen, this optional implementation can send an initial detection signal to one end of the wire harness under test through the signal generation module, so as to accurately detect whether there is an impedance mismatch point in the wire harness under test through the initial detection signal, and generate an echo signal when an impedance mismatch point exists. This not only improves the accuracy and reliability of detecting whether there is an impedance mismatch point in the wire harness under test, but also generates and feeds back an echo signal in a timely manner when an impedance mismatch point is detected. Fault detection of the wire harness under test can be achieved without feeding back the initial detection signal from the other end of the wire harness under test, which is conducive to further improving the efficiency and speed of fault detection.

[0051] Example 2 Please see Figure 2 , Figure 2 This is a flowchart illustrating a wire harness fault detection method based on time-domain reflection disclosed in an embodiment of the present invention. Wherein, Figure 2 The described time-domain reflectometry-based wire harness fault detection method can be applied to fault detection equipment. The fault detection equipment includes at least a signal processing module, a 3D engine module, and a fault database module. Furthermore, the fault detection equipment can be used to detect faults in any wire harness of the device under test. This embodiment of the invention does not limit the specific wire harness of the device under test. Figure 2 As shown, the wire harness fault detection method based on time-domain reflection may include the following steps: 201. When a target detection signal is received for the wiring harness of the device under test, the signal processing module reads the signal edge step difference of the target detection signal.

[0052] 202. The signal processing module calculates the fault location of the wiring harness of the device under test based on the preset time-domain reflection principle and the signal edge step difference.

[0053] 203. The signal processing module, through the 3D engine module, locates the fault point of the wire harness under test based on the fault location of the wire harness under test, and obtains the 3D fault location of the wire harness under test.

[0054] In this embodiment of the invention, for other descriptions of steps 201-203, please refer to the detailed description of steps 101-103 in Embodiment 1. These descriptions will not be repeated in this embodiment of the invention.

[0055] 204. The signal processing module inputs the waveform detection data corresponding to the target detection signal into the fault database module for classification to obtain the fault type of the wire harness of the device under test.

[0056] In this embodiment of the invention, the fault database module may integrate a first database. The first database is an expert fault database derived by training all available historical fault data of construction machinery using a neural network algorithm. Optionally, the historical fault data of construction machinery may include different historical fault phenomena (fault phenomena include fault types and may also include fault states) and waveform feature data of historical detection signals corresponding to each historical fault phenomenon. Specifically, the waveform feature data of each historical detection signal is used as input, and the historical fault phenomenon corresponding to each historical detection signal is used as output to train a pre-constructed neural network architecture, obtaining the trained neural network architecture as a fault classification model. The fault classification model and the historical fault data of construction machinery are then integrated into the first database.

[0057] Specifically, the signal processing module inputs the waveform detection data corresponding to the target detection signal into the fault database module; The fault database module receives the waveform detection data and checks if there is waveform feature data identical to the waveform detection data in the first database. If identical waveform feature data is detected, the fault type contained in the historical fault phenomena corresponding to the identical waveform feature data is determined as the fault type of the fault location. If no identical waveform feature data is detected, the waveform detection data is input into the fault classification model in the first database for classification to obtain the fault type of the fault location. This allows for direct determination of the fault type of the same waveform feature as the fault type of the tested equipment harness when the database stores identical waveform feature data. This improves fault classification efficiency while reducing the computing power required for classification. Furthermore, classification is performed using the trained fault classification model only when identical waveform feature data is not found in the database, thus improving the accuracy and flexibility of fault classification.

[0058] It is evident that implementation Figure 2The described time-domain reflectometry-based wire harness fault detection method can calculate the signal edge step difference of the target detection signal to obtain the fault location of the wire harness under test, ensuring ease of operation and improving the efficiency and accuracy of fault location detection. Furthermore, it can improve the location accuracy of the fault point through three-dimensional localization and analyze the fault type at the fault location using the waveform detection data corresponding to the target detection signal, thus improving the efficiency and accuracy of fault type detection. In addition, the waveform detection data corresponding to the target detection signal can be input into a fault database module for classification to obtain the fault type at the fault location, further improving the accuracy and reliability of wire harness fault type detection.

[0059] In an optional embodiment, the fault detection device further includes a display module. The method further includes: The signal processing module provides the three-dimensional fault location of the wire harness under test to the display module, so that the display module can display the three-dimensional fault location of the wire harness under test.

[0060] As can be seen, this optional embodiment can integrate a display module into the fault detection device, which not only enriches the functions of the fault detection device, but also displays the three-dimensional fault location of the wire harness under test, realizing the visualization of the wire harness fault location. This is beneficial for accurately prompting users the three-dimensional fault location of the wire harness under test, and makes it easier for users to find the fault point of the wire harness under test in a timely manner.

[0061] In this optional embodiment, as an alternative implementation, the method may further include: The signal processing module inputs the fault type of the wiring harness of the device under test into the fault database module for matching, and obtains a troubleshooting and handling solution that matches the fault type; The signal processing module provides the troubleshooting and handling solutions that match the fault type to the display module, so that the display module can display the fault type of the wire harness of the device under test and the troubleshooting and handling solutions that match the fault type.

[0062] In this embodiment of the invention, the fault database module may integrate a second database. This second database is an expert fault database derived by training all available historical inspection data of construction machinery using a neural network algorithm. Optionally, the historical inspection data of construction machinery may include different historical fault types and corresponding historical inspection and handling schemes for each fault type. Specifically, each historical fault type is used as input, and the corresponding historical inspection and handling scheme is used as output to train a pre-built neural network architecture. The trained neural network architecture serves as the fault inspection scheme identification model, and the fault inspection scheme identification model and the historical inspection data of construction machinery are integrated into the second database.

[0063] Specifically, the signal processing module inputs the fault type of the wiring harness of the device under test into the fault database module; The fault database module receives the fault type and checks if a historical fault type identical to the current fault type exists in the second database. If a historical fault type identical to the current fault type is detected, the historical troubleshooting and handling scheme corresponding to that historical fault type is identified as the matching troubleshooting and handling scheme for this fault type. If no historical fault type identical to the current fault type is detected, the fault type is input into the fault troubleshooting and handling scheme identification model in the second database for identification, thereby obtaining a matching troubleshooting and handling scheme. This allows for the direct identification of historical troubleshooting and handling schemes corresponding to the same historical fault type when the database stores such a scheme, thus improving the efficiency of scheme identification while reducing the computational power required. Furthermore, if a historical fault type identical to the current fault type does not exist in the database, identification is performed using the trained fault troubleshooting and handling scheme identification model, improving the accuracy and flexibility of the troubleshooting and handling scheme identification.

[0064] As can be seen, this optional implementation can continue to match the fault type with the fault type after the signal processing module determines the fault type through the fault database, and provide it to the display module to display the fault type of the wire harness under test and its matching troubleshooting solution. This realizes the visualization of the fault type of the wire harness under test and its matching troubleshooting solution, and quickly and accurately provides users with the troubleshooting solution corresponding to the fault point of the wire harness under test, which is conducive to improving the accuracy and efficiency of repairing the fault point of the wire harness under test.

[0065] In another optional embodiment, the signal processing module, through the 3D engine module, locates the fault point of the wire harness under test based on the fault location of the wire harness, obtaining the 3D fault location of the wire harness, including: The signal processing module acquires the 3D data of the wire harness of the device under test from the 3D engine module; The signal processing module locates the fault point in the wiring harness of the device under test based on the fault location and the three-dimensional data of the wiring harness, thereby obtaining the three-dimensional fault location of the wiring harness.

[0066] As can be seen, this optional embodiment can obtain the three-dimensional data of the wire harness of the device under test by the three-dimensional engine module through the signal processing module, and then locate the fault point based on the three-dimensional dataset to accurately obtain the three-dimensional fault location of the wire harness of the device under test, thereby improving the positioning accuracy and reliability of the wire harness fault point.

[0067] In yet another optional embodiment, the fault detection device further includes a power supply module. The method also includes: The power supply module directly or indirectly supplies the first power supply within the power supply module to the target module within the fault detection equipment; and / or, When an external power source is received, the power supply module converts the external power source into a second power supply, which is used to directly or indirectly power the target module inside the fault detection device.

[0068] In this embodiment of the invention, the power supply module may be provided with an external power supply port to receive external power, thereby enabling the power supply module to convert the external power into a second power supply. Optionally, the electrical energy in the first power supply within the power supply module may be the electrical energy stored from the second power supply converted from the external power when the fault detection device does not require power, or it may be the remaining electrical energy stored after the second power supply converted from the external power has supplied power. This embodiment of the invention does not impose any limitations.

[0069] In this embodiment of the invention, the target power supply in the power supply module (the target power supply includes a stored first power supply and / or a converted second power supply) can directly or indirectly power the target module within the fault detection device. The target module may include at least a signal processing module, and may also include modules requiring power such as a signal generation module and a signal acquisition module. Optionally, the first power supply and / or the converted second power supply stored in the power supply module are used to directly power the signal generation module in the fault detection device. This enables the signal generation module to generate an initial detection signal and inject it into the wiring harness of the device under test and the signal acquisition module. The electrical energy carried by the initial detection signal powers the signal acquisition module, thus indirectly powering the signal acquisition module through the first power supply and / or the second power supply. Furthermore, after the signal acquisition module is powered on, it sends the initial detection signal to the signal processing module, and the electrical energy carried by the initial detection signal powers the signal processing module, again indirectly powering the signal processing module through the first power supply and / or the second power supply. Further optionally, the first power supply stored in the power supply module and / or the second power supply obtained by conversion can also be used to directly power the signal generation module, signal acquisition module and signal processing module in the fault detection device. This embodiment of the invention does not limit this.

[0070] As can be seen, this optional embodiment can integrate a power supply module into the fault detection device, which not only enriches the functions of the fault detection device, but also ensures the operation of the subsequent wire harness fault detection process by supplying power to the target module of the fault detection device. This can improve the efficiency and reliability of wire harness fault detection to a certain extent. In addition, when receiving external power, it can directly use the power of the external power source to supply power, so as to realize the accumulation of excess power in the power supply module, reduce the waste of power and improve the utilization rate of power.

[0071] For example, such as Figure 3 As shown, Figure 3 This is a schematic diagram of the structure of a fault detector disclosed in an embodiment of the present invention, and Figure 3 Taking a fault detector as an example, such as... Figure 3 As shown, the fault detector 1 consists of a display 2, a processor 3, a memory 4, a power supply module 5, a 3D engine 6, an expert fault database 7, an oscilloscope 8, and a signal generator 9. The display 2, processor 3, memory 4, power supply module 5, 3D engine 6, expert fault database 7, oscilloscope 8, and signal generator 9 correspond to the display module, signal processing module, storage module, fault database module, signal acquisition module, and signal generation module, respectively. 10 is the wiring harness of the device under test. The display 2 is connected to the first terminal of the processor 3 and the first terminal of the oscilloscope 8 to display the three-dimensional fault location and troubleshooting solution obtained by the processor 3, as well as the signal waveform acquired by the oscilloscope 8. The second terminal of the processor 3 is connected to the second terminal of the oscilloscope 8, and the third terminal of the oscilloscope 8 is connected to the signal generator 9 and used to connect the wiring harness of the device under test. The third terminal of the processor 3 is connected to the three-dimensional engine 6, the fourth terminal of the processor 3 is connected to the expert fault database 7, the fifth terminal of the processor 3 is connected to the memory 4, and the sixth terminal of the processor 3, the fourth terminal of the oscilloscope 8, and the second terminal of the signal generator 9 are all connected to the power module 5. Optionally, the connection between the above components in the fault detector 1 can be electrical or communication. For example, all components in the fault detector 1 are connected electrically; or, the power module 5 is electrically connected to the processor 3, the oscilloscope 8, and the signal generator 9, while other components are connected via communication. This embodiment of the invention does not limit the connection.

[0072] Using the time-domain reflectometry principle, a pulse signal from a step signal generator is emitted and injected into one end of the wiring harness 10 of the device under test. Simultaneously, an oscilloscope 8 operates and detects the reflected waveform. When the signal encounters impedance mismatch in the wiring harness, it cannot continue its original path without loss, resulting in a partial echo. The injected signal and the echo signal are merged, and the sampling oscilloscope can acquire a new signal waveform. This new signal has a step difference that can be read at the edge; this difference represents the time difference between the emitted signal and the echo. This allows for the calculation of the wire length relationship between the fault reflection point and the signal input point using a formula, thus enabling fault location. The detected fault point can be one end of the machine connector or a fault detection point pre-designed in the machine's initial design. Each fault type / fault state of the wiring harness corresponds to a different waveform. Through training, the fault phenomena (including fault types / fault states) occurring in the engineering machinery wiring harness can be learned and stored in the expert fault library 7 of the fault detector 1. The waveform detection data of the oscilloscope 8 is transmitted to the processor 3 for analysis to obtain the corresponding fault type and fault location. Through the 3D engine 6 and the expert fault library 7, the 3D fault location is displayed on the monitor 2 and a troubleshooting and processing solution matching the fault type of the fault location is given.

[0073] The data source for 3D Engine 6 is the 3D data from the design finalization of engineering machinery. By importing the design data from the 3D software into the 3D engine, the 3D data corresponds one-to-one with the machine model, which can ensure the accuracy of fault location.

[0074] Expert Fault Database 7 is an expert fault database that is trained and learned by using a neural network algorithm to train all available historical faults of engineering machinery.

[0075] Power supply module 5 is equipped with a lithium battery of a certain capacity, enabling wireless operation, and also has a reserved external power supply port for jump-starting. Power supply module 5 is the power source for fault detector 1 and its internal components.

[0076] Example 3 Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of a fault detection device disclosed in an embodiment of the present invention. Figure 4 The fault detection device shown is used to detect faults in any wire harness of any device under test based on any of the time-domain reflectometry-based wire harness fault detection methods described in Embodiments 1 and 2. This embodiment of the invention does not limit the specific wire harness of the device under test. For example... Figure 4 As shown, the fault detection device may include at least a signal processing module 301 and a 3D engine module 302, wherein the signal processing module 301 is used for: Upon receiving a target detection signal for the wiring harness of the device under test, the signal edge difference of the target detection signal is read. Based on the preset time-domain reflection principle, the fault location of the wire harness under test is calculated according to the signal edge step difference; and through the three-dimensional engine module 302, the fault point of the wire harness under test is located according to the fault location of the wire harness under test, and the three-dimensional fault location of the wire harness under test is obtained. Based on the waveform detection data corresponding to the target detection signal, analyze the fault type of the wiring harness of the device under test; The target detection signal is obtained by fusing the initial detection signal for the wiring harness of the device under test and the echo signal corresponding to the initial detection signal. The echo signal is used to indicate that the wiring harness of the device under test has failed.

[0077] It is evident that implementation Figure 4 The described fault detection device can calculate the signal edge step difference of the target detection signal to obtain the fault location of the wire harness of the device under test through the time domain reflection principle, so as to ensure the ease of operation of wire harness fault detection, improve the detection efficiency and accuracy of wire harness fault location, improve the positioning accuracy of wire harness fault point by performing three-dimensional positioning of the fault point, and analyze the fault type of the wire harness of the device under test through the waveform detection data corresponding to the target detection signal, which is conducive to improving the detection efficiency and accuracy of wire harness fault type.

[0078] In an optional embodiment, such as Figure 5 As shown, Figure 5 This is a schematic diagram of another fault detection device disclosed in an embodiment of the present invention. The fault detection device may further include a signal acquisition module 303. The signal acquisition module 303 is used to acquire a target detection signal obtained by fusing the initial detection signal and the echo signal if the wire harness of the device under test generates an echo signal under the detection action of the initial detection signal, and send the target detection signal to the signal processing module 301.

[0079] As can be seen, this optional embodiment can acquire target detection signals for the wire harness of the device under test through the signal acquisition module and send them to the signal processing module, so as to realize the rapid and accurate reception of the target detection signals by the signal processing module. This is beneficial to improving the accuracy, efficiency and timeliness of the signal processing module in detecting target detection signals, thereby improving the accuracy, efficiency and timeliness of the signal processing module in detecting faults in the wire harness of the device under test.

[0080] In this optional embodiment, as an optional implementation method, such as Figure 5As shown, the fault detection device may further include a signal generation module 304. The signal generation module 304 is used to send an initial detection signal to one end of the wiring harness of the device under test, to detect whether there is an impedance mismatch point in the wiring harness of the device under test through the initial detection signal, and to generate an echo signal when an impedance mismatch point is detected in the wiring harness of the device under test. When there is no impedance mismatch point in the wiring harness of the device under test, it indicates that the wiring harness of the device under test is not faulty; when there is an impedance mismatch point in the wiring harness of the device under test, it indicates that the wiring harness of the device under test has been faulty.

[0081] As can be seen, this optional implementation can send an initial detection signal to one end of the wire harness under test through the signal generation module, so as to accurately detect whether there is an impedance mismatch point in the wire harness under test through the initial detection signal, and generate an echo signal when an impedance mismatch point exists. This not only improves the accuracy and reliability of detecting whether there is an impedance mismatch point in the wire harness under test, but also generates and feeds back an echo signal in a timely manner when an impedance mismatch point is detected. Fault detection of the wire harness under test can be achieved without feeding back the initial detection signal from the other end of the wire harness under test, which is conducive to further improving the efficiency and speed of fault detection.

[0082] In another alternative embodiment, such as Figure 5 As shown, the fault detection device may further include a fault database module 305. The fault database module 305 is used to receive waveform detection data corresponding to the target detection signal input by the signal processing module 301, classify the target detection signal according to the waveform detection data to obtain the fault type of the wire harness under test, and output the fault type of the wire harness under test to the signal processing module 301.

[0083] As can be seen, this optional embodiment can input the waveform detection data corresponding to the target detection signal into the fault database module for classification, thereby obtaining the fault type of the wire harness of the device under test, and improving the detection accuracy and reliability of the wire harness fault type.

[0084] In yet another alternative embodiment, such as Figure 5 As shown, the fault detection device may also include a display module 306. The display module 306 is used to display the three-dimensional fault location of the tested device harness sent by the signal processing module 301.

[0085] As can be seen, this optional embodiment can integrate a display module into the fault detection device, which not only enriches the functions of the fault detection device, but also displays the three-dimensional fault location of the wire harness under test, realizing the visualization of the wire harness fault location. This is beneficial for accurately prompting users the three-dimensional fault location of the wire harness under test, and makes it easier for users to find the fault point of the wire harness under test in a timely manner.

[0086] In this optional embodiment, as an optional implementation, the signal processing module 301 is further configured to input the fault type of the wire harness of the device under test into the fault database module 305 for matching, to obtain a troubleshooting and processing scheme that matches the fault type; and to provide the troubleshooting and processing scheme that matches the fault type to the display module 306, so that the display module 306 displays the fault type of the wire harness of the device under test and the troubleshooting and processing scheme that matches the fault type.

[0087] As can be seen, this optional implementation can continue to match the fault type with the fault type after the signal processing module determines the fault type through the fault database, and provide it to the display module to display the fault type of the wire harness under test and its matching troubleshooting solution. This realizes the visualization of the fault type of the wire harness under test and its matching troubleshooting solution, and quickly and accurately provides users with the troubleshooting solution corresponding to the fault point of the wire harness under test, which is conducive to improving the accuracy and efficiency of repairing the fault point of the wire harness under test.

[0088] In another optional embodiment, the signal processing module 301, through the 3D engine module 302, locates the fault point of the wire harness under test based on the fault location of the wire harness under test, and obtains the 3D fault location of the wire harness under test in the following specific ways: The signal processing module 301 acquires the three-dimensional data of the wire harness of the device under test from the three-dimensional engine module 302; The signal processing module 301 locates the fault point of the wire harness under test based on the fault location of the wire harness and the three-dimensional data of the wire harness under test, and obtains the three-dimensional fault location of the wire harness under test.

[0089] As can be seen, this optional embodiment can obtain the three-dimensional data of the wire harness of the device under test by the three-dimensional engine module through the signal processing module, and then locate the fault point based on the three-dimensional dataset to accurately obtain the three-dimensional fault location of the wire harness of the device under test, thereby improving the positioning accuracy and reliability of the wire harness fault point.

[0090] In yet another alternative embodiment, such as Figure 5 As shown, the fault detection device may further include a power supply module 307. The power supply module 307 is used to directly or indirectly supply a first power supply within the power supply module 307 to a target module within the fault detection device, the target module including at least a signal processing module 301; and, upon receiving an external power supply, to convert the external power supply into a second power supply, the second power supply being used to directly or indirectly power the target module within the fault detection device.

[0091] As can be seen, this optional embodiment can integrate a power supply module into the fault detection device, which not only enriches the functions of the fault detection device, but also ensures the operation of the subsequent wire harness fault detection process by supplying power to the target module of the fault detection device. This can improve the efficiency and reliability of wire harness fault detection to a certain extent. In addition, when receiving external power, it can directly use the power of the external power source to supply power, so as to realize the accumulation of excess power in the power supply module, reduce the waste of power and improve the utilization rate of power.

[0092] Example 4 Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of another fault detection device disclosed in an embodiment of the present invention. Figure 6 The fault detection device shown is used to detect faults in any wire harness of any device under test based on any of the time-domain reflectometry-based wire harness fault detection methods described in Embodiments 1 and 2. This embodiment of the invention does not limit the specific wire harness of the device under test. For example... Figure 6 As shown, the fault detection device includes a device body 401 and a wire harness fault detection device 402; wherein, the wire harness fault detection device 402 is used to perform the wire harness fault detection method based on time domain reflection as described in any of the embodiments of the present invention 1 and 2, or, the wire harness fault detection device 402 may include any of the fault detection devices described in embodiment 3, and the embodiments of the present invention will not be repeated.

[0093] Example 5 Please see Figure 7 , Figure 7 This is a schematic diagram of the structure of another fault detection device disclosed in an embodiment of the present invention. Figure 7 The fault detection device shown is used to detect faults in any wire harness of any device under test based on any of the time-domain reflectometry-based wire harness fault detection methods described in Embodiments 1 and 2. This embodiment of the invention does not limit the specific wire harness of the device under test. For example... Figure 7 As shown, the fault detection device may include: Memory 501 storing executable program code; Processor 502 coupled to memory 501; The processor 502 calls the executable program code stored in the memory 501 to execute some or all of the steps in the harness fault detection method based on time-domain reflection described in either Embodiment 1 or Embodiment 2 of the present invention.

[0094] Example 6 This invention discloses a computer storage medium storing computer instructions. When these computer instructions are invoked, they are used to execute some or all of the steps in the wire harness fault detection method based on time-domain reflection described in either Embodiment 1 or Embodiment 2 of this invention.

[0095] The device embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0096] Through the detailed description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-Erasable Programmable Read-Only Memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0097] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present invention and are only used to illustrate the technical solutions of the present invention, not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A time domain reflection based wire harness fault detection method, characterized by, The method is applied to a fault detection device, and the fault detection device at least comprises a signal processing module and a three-dimensional engine module, and the method comprises: Upon receiving a target detection signal for a wire harness of a device under test, the signal processing module reads a signal edge step difference of the target detection signal; The signal processing module calculates a fault position of the wire harness of the device under test based on a preset time domain reflection principle according to the signal edge step difference, and performs fault point positioning on the wire harness of the device under test according to the fault position of the wire harness of the device under test through the three-dimensional engine module, to obtain a three-dimensional fault position of the wire harness of the device under test; The signal processing module analyzes a fault type of the wire harness of the device under test according to waveform detection data corresponding to the target detection signal; The target detection signal is obtained by fusing an initial detection signal for the wire harness of the device under test and an echo signal corresponding to the initial detection signal, and the echo signal is used to indicate that the wire harness of the device under test has occurred a fault.

2. The time domain reflection based wire bundle fault detection method of claim 1, wherein, The fault detection device further comprises a signal acquisition module. The method further comprises: If the wire harness of the device under test generates an echo signal under the detection of the initial detection signal, the signal acquisition module acquires the target detection signal obtained by fusing the initial detection signal and the echo signal, and sends the target detection signal to the signal processing module.

3. The time domain reflection based wire bundle fault detection method of claim 2, wherein, The fault detection device further comprises a signal generation module. The method further comprises: The signal generation module sends the initial detection signal to one end of the wire harness of the device under test, to detect whether there is an impedance mismatch point in the wire harness of the device under test through the initial detection signal, and generates the echo signal when the impedance mismatch point in the wire harness of the device under test is detected; When the wire harness of the device under test does not have the impedance mismatch point, it indicates that the wire harness of the device under test has not occurred a fault, and when the wire harness of the device under test has the impedance mismatch point, it indicates that the wire harness of the device under test has occurred a fault.

4. The time domain reflection based wire bundle fault detection method of any of claims 1-3, wherein, The fault detection device further comprises a fault database module. The signal processing module analyzes the fault type of the wire harness of the device under test according to the waveform detection data corresponding to the target detection signal, which comprises: The signal processing module inputs the waveform detection data corresponding to the target detection signal into the fault database module for classification, to obtain the fault type of the wire harness of the device under test.

5. The time domain reflection based wire bundle fault detection method of claim 4, wherein, The fault detection device further comprises a display module. The method further comprises: The signal processing module provides the three-dimensional fault position of the wire harness of the device under test to the display module, so that the display module displays the three-dimensional fault position of the wire harness of the device under test.

6. The time domain reflection based wire bundle fault detection method of claim 5, wherein, The method further comprises: The signal processing module inputs the fault type of the wire harness of the device under test into the fault database module for matching, to obtain an investigation and processing scheme matched with the fault type. The signal processing module provides the troubleshooting scheme matched with the fault type to the display module, so that the display module displays the fault type of the wire harness of the measured device and the troubleshooting scheme matched with the fault type.

7. The time domain reflection based wire bundle fault detection method according to any one of claims 1, 2, 3, 5 and 6, characterized in that, The signal processing module performs fault point positioning on the wire harness of the measured device according to the fault position of the wire harness of the measured device through the three-dimensional engine module, and obtains the three-dimensional fault position of the wire harness of the measured device, including: The signal processing module obtains the three-dimensional data of the wire harness of the measured device from the three-dimensional engine module; The signal processing module performs fault point positioning on the wire harness of the measured device according to the fault position of the wire harness of the measured device and the three-dimensional data of the wire harness of the measured device, and obtains the three-dimensional fault position of the wire harness of the measured device.

8. The time domain reflection based wire bundle fault detection method according to any one of claims 1, 2, 3, 5 and 6, characterized in that, The fault detection device further comprises a power supply module; The method further comprises: The power supply module directly or indirectly provides the first power supply in the power supply module to the target module in the fault detection device, and the target module at least includes the signal processing module; and / or, When receiving an external power supply, the power supply module converts the external power supply into a second power supply, and the second power supply is used to directly or indirectly supply power to the target module in the fault detection device.

9. A fault detection device, characterized by The fault detection device at least includes a signal processing module and a three-dimensional engine module, wherein the signal processing module is configured to: When receiving a target detection signal of a wire harness of a measured device, read the signal edge difference of the target detection signal; Based on a preset time domain reflection principle, calculate the fault position of the wire harness of the measured device according to the signal edge difference; and through the three-dimensional engine module, perform fault point positioning on the wire harness of the measured device according to the fault position of the wire harness of the measured device, and obtain the three-dimensional fault position of the wire harness of the measured device; According to the waveform detection data corresponding to the target detection signal, analyze the fault type of the wire harness of the measured device; The target detection signal is obtained by fusing an initial detection signal of the wire harness of the measured device and an echo signal corresponding to the initial detection signal, and the echo signal is used to indicate that the wire harness of the measured device has failed.

10. A fault detection device, characterized by The fault detection device comprises a device body and a wire harness fault detection device; wherein the wire harness fault detection device is configured to perform the time domain reflection-based wire harness fault detection method according to any one of claims 1-8.

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