Conduction test system and method for engine wire harness

Abstract

The invention relates to a system and a method for testing the conductivity of an engine wire harness, and relates to the field of intelligent detection, a programmable switch matrix is formed by acquiring a wire harness layout diagram and arranging matrix relays, and after logic self-inspection is executed, an optimal conduction path is searched based on a hierarchical partition model and a DFS algorithm; according to the method, the path image sets of the partitions are overlapped and mapped to identify abnormal wire harness sections, and finally, abnormity is determined through analog signal injection and waveform analysis and physical repair guidance is performed, so that the technical problems of low test efficiency, poor flexibility and difficulty in adapting to complex variable wire harness layout conductivity test are solved, and the purposes of improving the test flexibility and efficiency and reducing the test cost are achieved. And a fault point can be accurately positioned.

Description

Technical Field

[0001] The present invention relates to the field of intelligent detection, and particularly to a conduction test system and method for an engine wiring harness. Background Art

[0002] In the field of modern automobile manufacturing and maintenance, as an important part of the electrical system, the reliability of the conduction of the engine wiring harness is directly related to the performance and safety of the vehicle. The engine wiring harness is usually composed of multiple wires and connectors, which are intricately intertwined to form a complex electrical network. This network is responsible for transmitting various electrical signals and power to drive the normal operation of the engine and other key components.

[0003] However, due to the complexity of the engine wiring harness, the conduction test thereof has always been a technical problem. In the prior art, the conduction test for complex engine wiring harnesses mainly relies on voltage partition detection or point-by-point scanning methods to achieve fault location. The voltage partition detection method divides the wiring harness into multiple regions, then applies voltage to each region, and determines the conduction of the wiring harness by measuring the changes in voltage and current. Although this method can locate faults to a certain extent, since the partition is fixed, it is difficult to adapt to the changes in different vehicle models and wiring harness layouts, so the flexibility and efficiency are limited. The point-by-point scanning method tests each node on the wiring harness one by one, and determines the conduction of the wiring harness by comparing the test results with the preset standards. Although this method can cover all nodes, the test process is time-consuming and prone to a large number of redundant tests. Especially for complex and variable engine wiring harnesses, the test efficiency is even lower.

[0004] In summary, the existing conduction test methods for engine wiring harnesses have many limitations and are difficult to meet the requirements of modern automobile manufacturing and maintenance. Summary of the Invention

[0005] In view of the technical problems in the prior art, such as low test efficiency, poor flexibility, and difficulty in adapting to the conduction test of complex and variable wiring harness layouts, the present invention provides a conduction test system and method for an engine wiring harness to solve these problems.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: In a first aspect, the present invention provides a conductivity test system for an engine wiring harness. The system includes: a control matrix layout module, configured to obtain an engine wiring harness layout diagram, traverse key nodes of the engine wiring harness layout diagram, and layout matrix relays to obtain a programmable switch matrix; a logic self-check module, configured to perform a logic self-check on the matrix relays by triggering a control signal through an instruction to obtain an execution response set. If the results in the execution response set all indicate passing, activate the programmable switch matrix; a path search module, configured to combine the engine wiring harness layout diagram, based on a hierarchical partition model and with the conductivity of the wiring harness as a constraint, perform a path search on the programmable switch matrix based on the DFS algorithm to obtain multiple path conductivity node atlases, where the multiple path conductivity node atlases correspond one-to-one to the partitions in the hierarchical partition model; an atlas mapping module, configured to overlap and map the path conductivity node atlases corresponding to each partition based on the engine wiring harness layout diagram to obtain a wiring harness segment with abnormal topological map annotation; a repair guidance module, configured to inject analog signals into the wiring harness segments with abnormal topological map annotation one by one for receiving-end waveform analysis to obtain a set of abnormal wiring harness segment identifiers and perform physical repair guidance.

[0007] In a second aspect, the present invention provides a method for testing the conductivity of an engine wiring harness. The method includes: obtaining an engine wiring harness layout diagram, traversing key nodes of the engine wiring harness layout diagram, and layout matrix relays to obtain a programmable switch matrix; performing a logic self-check on the matrix relays by triggering a control signal through an instruction to obtain an execution response set. If the results in the execution response set all indicate passing, activate the programmable switch matrix; combining the engine wiring harness layout diagram, based on a hierarchical partition model and with the conductivity of the wiring harness as a constraint, perform a path search on the programmable switch matrix based on the DFS algorithm to obtain multiple path conductivity node atlases, where the multiple path conductivity node atlases correspond one-to-one to the partitions in the hierarchical partition model; overlapping and mapping the path conductivity node atlases corresponding to each partition based on the engine wiring harness layout diagram to obtain a wiring harness segment with abnormal topological map annotation; injecting analog signals into the wiring harness segments with abnormal topological map annotation one by one for receiving-end waveform analysis to obtain a set of abnormal wiring harness segment identifiers and perform physical repair guidance.

[0008] The beneficial effects of the present invention are as follows: By obtaining the wiring harness layout diagram, laying out matrix relays to form a programmable switch matrix, and performing a logic self-check, then searching for the optimal conduction path based on the hierarchical partition model and the DFS algorithm, overlapping and mapping the path atlases of each partition to identify abnormal wiring harness segments, and finally determining abnormalities and performing physical repair guidance through analog signal injection and waveform analysis, the flexibility and efficiency of the test are improved, and the fault point can be accurately located. Description of the Drawings

[0009] Figure 1Schematic structural diagram of a conductivity test system for an engine wiring harness provided by the present invention.

[0010] Figure 2 Schematic flow diagram of a conductivity test method for an engine wiring harness provided by the present invention.

[0011] Explanation of reference numerals: control matrix layout module 11, logic self-check module 12, path search module 13, atlas mapping module 14, repair guidance module 15. Detailed implementation manners

[0012] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

[0013] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0014] In the description of the present invention, the term "for example" is used to mean "serving as an example, illustration, or explanation". Any embodiment described as "for example" in the present invention is not necessarily construed as being more preferred or having more advantages than other embodiments. In order for any person skilled in the art to implement and use the present invention, the following description is given. In the following description, details are set forth for purposes of explanation. It should be understood that those skilled in the art can recognize that the present invention can be implemented without the use of these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the present invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

[0015] Embodiment 1:

[0016] As Figure 1 shown, the embodiment of the present invention provides a conductivity test system for an engine wiring harness, and the system includes: A control matrix layout module 11, configured to obtain an engine wiring harness layout diagram, traverse key nodes of the engine wiring harness layout diagram, and layout matrix relays to obtain a programmable switch matrix.

[0017] Exemplarily, first, obtain the layout diagram of the engine wiring harness, which is a network diagram that details each wire, connector, and their connection relationships in the wiring harness. Subsequently, the system traverses the key nodes on this layout diagram. These key nodes are usually connectors, branch points, or important circuit nodes in the wiring harness, and they are crucial for ensuring the conductivity of the wiring harness.

[0018] During the traversal of the key nodes, a matrix relay network is deployed in the wiring harness according to the positions and connection relationships of these nodes. The matrix relay network consists of multiple high-density relays, which can be programmed and controlled to form different conduction paths. By precisely deploying these relays, a programmable switch matrix can be obtained, which can dynamically switch the conduction paths according to the test requirements.

[0019] For example, assume there is a critical circuit in the engine wiring harness from the engine control unit (ECU) to the fuel injector, which passes through multiple connectors and branch points. When deploying the matrix relays, the system installs relays at these critical positions and controls them through programming to ensure the accurate detection of the conductivity of this circuit during testing. If a certain connector or branch point fails, the system can bypass the faulty point by switching the relays, thereby continuing to test other parts of the circuit.

[0020] This method of deploying matrix relays and obtaining a programmable switch matrix not only improves the flexibility of testing but also enables the system to adapt to changes in different vehicle models and wiring harness layouts. Whether it is a complex luxury vehicle model or a simple economy vehicle model, the system can deploy relays according to the actual wiring harness layout diagram and generate corresponding test paths.

[0021] The logic self-checking module 12 is used to trigger a control signal through an instruction to perform a logic self-check on the matrix relay, obtain an execution response set, and activate the programmable switch matrix if all the results in the execution response set indicate passing.

[0022] Preferably, during the conductivity test of the engine wiring harness, it is crucial to ensure the normal operation of the matrix relay. Therefore, the system triggers a control signal through an instruction to perform a logic self-check on the already deployed matrix relay. This process is equivalent to a comprehensive inspection of the relay network to check whether each relay unit can perform switch actions as expected.

[0023] Specifically, the system sends self-check control signals to each relay unit of the matrix relay and monitors the action responses of these relay units after receiving the signals. These responses are recorded by the system to form an execution response set. Next, each result in the execution response set is compared and analyzed according to a preset standard response list. This standard response list details parameters such as the contact action time range and the state change sequence that the relay unit should have under normal operating conditions.

[0024] If all the results in the execution response set match the expected values in the standard response list and the parameter deviation is not greater than the preset deviation threshold, then the system will mark these relay units as "passed" and activate the programmable switch matrix for subsequent wire harness continuity testing.

[0025] For example, assume that there is a relay unit in the matrix relay responsible for connecting the engine control unit and the ignition coil. During the logic self-check process, the system sends a self-check control signal to this relay unit and monitors its action response. If the relay unit can complete the switching action within the specified time and the state change sequence is consistent with the record in the standard response list, then the system will mark it as "passed" and allow it to participate in the subsequent test process, which can ensure that each relay unit can play a normal role in the test, thereby improving the accuracy and reliability of the entire test system.

[0026] The path search module 13 is used to perform path search on the programmable switch matrix based on the DFS algorithm by combining the engine wire harness layout diagram, taking the hierarchical partition model as the basis and the wire harness continuity as the constraint, to obtain multiple path conduction node atlases, where the multiple path conduction node atlases correspond one by one to the partitions in the hierarchical partition model.

[0027] Specifically, in order to efficiently locate and detect potential faults in the wire harness, the system adopts an innovative hierarchical partition model by combining the engine wire harness layout diagram. The hierarchical partition model divides the wire harness layout into multiple levels such as high-frequency fault areas and low-frequency fault areas according to the frequency of fault occurrence, so as to be able to dynamically optimize the test sequence and give priority to testing the areas where faults may occur.

[0028] In actual operation, the system performs path search on the programmable switch matrix based on this hierarchical partition model with the wire harness continuity as the constraint condition by using the depth-first search (DFS) algorithm. This process can be understood as that the system performs parallel testing on the matrix relays in each area according to the area division of different levels, so as to batch verify the continuity of multiple wire harness segments. This area division is not a division in the actual spatial sense, but is based on different frequency areas of faults as the starting point of the search.

[0029] For example, assume that there is a high-frequency fault area in the engine wiring harness. This area is likely to malfunction due to frequent vibration or high temperature. During testing, the system will prioritize testing the matrix relays in this area and quickly traverse all possible conduction paths based on the DFS algorithm. At the same time, for low-frequency fault areas, the system will also conduct corresponding tests, but may use a lower priority.

[0030] During the testing process, the system will record the detection results of each hierarchical area and generate multiple path conduction node atlases based on these results. These atlases are actually a visual representation of the wiring harness conductivity, showing which wiring harness segments can conduct normally in different hierarchical areas. In this way, once the system detects an abnormality in a certain wiring harness segment, it can immediately locate the specific layout position and connection relationship, providing precise guidance for subsequent physical repair.

[0031] By this testing method, not only can the efficiency and accuracy of testing be significantly improved, but it can also better adapt to the changes in different vehicle models and wiring harness layouts, providing a new solution for the conductivity testing of the engine wiring harness.

[0032] The atlas mapping module 14 is used to overlap and map the path conduction node atlases corresponding to each partition based on the engine wiring harness layout diagram to obtain the wiring harness segments with abnormal topological map markings.

[0033] Furthermore, the path conduction node atlases corresponding to each partition have been obtained, which detail the connection relationships and conduction states between the wiring harness segments in different hierarchical areas. Next, the system will perform an overlapping mapping of these path conduction node atlases according to the engine wiring harness layout diagram. The process of overlapping mapping can be understood as the system superimposing and displaying the nodes and connection relationships in different partition atlases to form a complete wiring harness topology diagram. During this process, the system will carefully check the conduction states and connection attributes of each node to ensure their consistency. For example, assume there are two adjacent partitions with a common wiring harness segment between them. During overlapping mapping, the system will check whether the representation of this wiring harness segment in the two partition atlases is consistent. If it is consistent, then this wiring harness segment is considered normal; if it is inconsistent, such as showing conduction in one partition atlas and open circuit in the other, then this wiring harness segment will be marked as suspected abnormal.

[0034] Through this overlapping mapping method, the system can accurately identify the abnormal wire harness segments in the topology diagram and label them. These labels will clearly show the locations of the abnormal wire harness segments and possible fault types, such as open circuit, short circuit, or poor contact, etc. In this way, maintenance personnel can quickly locate the fault points based on this labeled information and take corresponding repair measures. This abnormal labeling method based on overlapping mapping not only improves the accuracy of testing but also provides great convenience for subsequent maintenance work. It enables maintenance personnel to quickly understand the layout and connection relationship of the wire harness, as well as the specific location of the fault points, thus greatly shortening the maintenance time and cost.

[0035] The repair guidance module 15 is used to analyze the waveforms at the receiving end by injecting analog signals into the abnormal labeled wire harness segments in the topology diagram one by one, obtain a set of abnormal wire harness segment identifiers, and perform physical repair guidance.

[0036] Specifically, at the final stage of the engine wire harness continuity test, the system will check each of the wire harness segments abnormally labeled in the topology diagram one by one. This step is crucial because it directly relates to the precise location of the fault points and subsequent physical repair work. Specifically, for each wire harness segment labeled as abnormal, the system will inject an analog signal, which can be a current or voltage signal, with the aim of simulating the signal transmission situation in the wire harness under actual working conditions. After injecting the signal, the system will collect the waveform at the receiving end, that is, record the received signal waveform. Next, the collected receiving-end waveform will be compared and analyzed with a preset standard waveform. Among them, the standard waveform is set according to the normal working state of the engine wire harness, and it represents the signal transmission characteristics of the wire harness under fault-free conditions. Through the comparison and analysis, the system can determine the specific fault type of the abnormal wire harness segment, such as open circuit, short circuit, or poor contact, etc. For example, assume that the waveform collected at the receiving end of a certain wire harness segment has a significant difference from the standard waveform, and the waveform shows obvious interruption or distortion, then the system can determine that this wire harness segment has an open circuit fault. Once the fault type and location are determined, the system will organize the information of these abnormal wire harness segments into a set of identifiers and generate a corresponding physical repair guidance plan. This repair guidance plan will detail the location of the fault point, possible fault causes, and repair suggestions. Maintenance personnel can quickly locate the fault point based on this plan and take corresponding repair measures, such as replacing the damaged wire harness segment, re-welding the connector, etc. By this method of checking one by one, waveform analysis, and physical repair guidance, it can ensure that each fault point is accurately identified and effectively repaired, thus greatly improving the reliability and safety of the engine wire harness.

[0037] In a preferred embodiment, the system further includes: if there is a result with an identification of "failed" in the execution response set, the relay with the identification of "failed" is extracted for position warning processing.

[0038] Specifically, when the system completes the logic self-check of the matrix relay and obtains the execution response set, it will enter the result verification stage. The system will check each result in the execution response set one by one to determine whether each relay unit operates normally according to the preset logic and parameter requirements. If it is found during the verification process that there is a result with an identification of "failed" in the execution response set, this indicates that the corresponding relay unit fails to meet the expected response standard, and there may be abnormal conditions such as contact adhesion, coil open circuit, response delay, etc., which will directly affect the accuracy of the subsequent wire harness conductivity test and even cause the interruption of the entire test process.

[0039] In response to such a situation, the relay position warning processing mechanism is immediately activated. Specifically, the system will accurately extract the relevant information of the relay unit with an identification of "failed", and these information cover key elements such as the specific coordinate position of the relay in the wire harness layout diagram, the circuit loop number to which it belongs, and the unique identity identifier. Subsequently, based on these information, an intuitive position warning prompt is generated and presented to the test personnel in the form of a visual interface or an alarm prompt sound.

[0040] For example, when a relay located in the core area of the engine wire harness and responsible for connecting key sensors and control modules fails the self-check, the system will prominently display the position of the relay on the layout diagram with a striking red mark, and at the same time pop up a detailed prompt window indicating the relay number, fault type and possible affected circuit functions. Based on these warning messages, the test personnel can quickly locate the position of the faulty relay without spending a lot of time checking one by one in the complex wire harness, greatly shortening the fault diagnosis time. Next, the test personnel can further conduct physical inspection and replacement operations on the relay to ensure that the matrix relay network resumes normal operation, providing a reliable guarantee for the smooth progress of the subsequent engine wire harness conductivity test.

[0041] In a preferred embodiment, a logic self-check is performed on the matrix relay by triggering a control signal through an instruction to obtain an execution response set. If the results in the execution response set all indicate passing, the programmable switch matrix is activated, including: triggering a self-check control signal through a wire harness conductivity test start instruction, sequentially sending the self-check control signal to each relay unit of the matrix relay, monitoring the action response of each relay unit, and obtaining an execution response set; judging the signal-action matching relationship in the execution response set based on a preset standard response list. When the matching relationship is consistent with the relationship in the preset standard response list and the parameter deviation is not greater than a preset deviation threshold, the corresponding relay unit is marked as passing; if the results in the execution response set all indicate passing, the programmable switch matrix is activated for wire harness conductivity test.

[0042] In a specific embodiment, the first step in the system startup test is to perform a logic self-check on the matrix relay. Specifically, when the tester issues a wire harness conductivity test start instruction, the system triggers a self-check control signal, which is sequentially sent to each relay unit in the matrix relay. At this time, the system monitors the action response of each relay unit after receiving the self-check control signal, including the closing and opening actions of the contacts, the response speed of the actions, etc., and integrates these monitoring results to form an execution response set, which is equivalent to the self-check performance of each relay unit.

[0043] Subsequently, the system judges the execution response set according to the preset standard response list. The preset standard response list is like a detailed standard answer, which stores the corresponding relationship between the contact action time range and the state change sequence parameters that the relay unit should have in the normal working state. The system will carefully compare the signal-action matching relationship in the execution response set with the relationship in the preset standard response list, not only requiring the matching relationship to be consistent, but also strictly examining the parameter deviation such as the action time. Only when the parameter deviation is not greater than the preset deviation threshold, the corresponding relay unit will be marked as "passing". For example, if the contact closing action time of a certain relay unit is specified in the standard response list to be within 50-70 milliseconds, and the actually monitored action time is 60 milliseconds, and the deviation is within the allowable range, then this unit passes this judgment; if the actual action time is 80 milliseconds, exceeding the deviation threshold, it will be judged as abnormal.

[0044] When all the results in the response set are marked as "passed", it means that the overall performance of the matrix relay meets the test requirements. Subsequently, the system activates the programmable switch matrix and makes it enter the standby working state, ready to conduct a continuity test on the engine wiring harness. This series of rigorous self-check and activation processes ensure the reliable operation of the matrix relay during the test, laying a solid foundation for accurately detecting the continuity of the wiring harness later, avoiding the distortion of test results caused by the relay's own faults, and guaranteeing the accuracy and reliability of the entire test process.

[0045] In a preferred embodiment, in combination with the layout diagram of the engine wiring harness, based on the hierarchical partition model and with the wiring harness continuity as a constraint, path search is performed on the programmable switch matrix based on the DFS algorithm to obtain multiple path conduction node atlases, including: obtaining the historical fault areas, dividing the area of the engine wiring harness layout diagram based on the fault frequency, and constructing a hierarchical partition model based on the area division result. Among them, each area corresponds to a partition level; taking the wiring harness continuity as a constraint, parallel tests for wiring harness continuity path search are performed on the programmable switch matrix in different layer areas based on the DFS algorithm to batch verify the continuity of multiple wiring harness segments and obtain multiple path conduction node atlases; where each partition level corresponds to a path conduction node atlas, and the path conduction node atlas is the path topology diagram of all normally conducting wiring harnesses in the engine wiring harness layout diagram.

[0046] Optionally, to improve the test efficiency and the accuracy of fault location, collect and analyze the historical engine wiring harness fault data accumulated in the past, and extract the historical fault area information from it. These historical fault areas are like the "high-incidence areas" of the wiring harness, covering the specific positions of the wiring harness segments where faults such as open circuits, short circuits, or poor contacts have frequently occurred. Furthermore, based on the fault frequencies reflected by these historical fault data, the system will perform area division on the engine wiring harness layout diagram. For example, if the fault incidence rate of the wiring harness in a certain area is as high as 30% in the past year, while that in another area is only 5%, the system will, based on this significant difference, define the high-fault-incidence area as the high-frequency fault area and the low-fault-incidence area as the low-frequency fault area, and then construct a hierarchical partition model based on the area division result. In this model, each area corresponds to a specific partition level, and the higher the level, the greater the fault risk usually means, and higher test priorities need to be given.

[0047] After the hierarchical partition model is constructed, the key indicator of wire harness conductivity is used as the core constraint condition, setting a strict "passing criterion" for the test process. Subsequently, the depth-first search (DFS) algorithm is used to conduct parallel tests on the wire harness conductivity path search for the programmable switch matrix in different layer regions. The DFS algorithm can penetrate into every corner of the wire harness network to explore all possible conduction paths. During the parallel test, the test tasks of multiple partition levels are advanced simultaneously, and the system can batch verify the conductivity of multiple wire harness segments, greatly shortening the overall test time. For example, the wire harness segment tests in the high-frequency fault area and the low-frequency fault area are carried out simultaneously, and the system quickly traverses the wire harness connection relationships in these areas to check for abnormalities such as open circuits or short circuits.

[0048] After path search and test verification, the system will finally obtain multiple path conduction node atlases. Each partition level corresponds to a dedicated path conduction node atlas. These atlases are essentially the path topologies of all normally conducting wire harnesses in the engine wire harness layout diagram, presenting the connection and conduction states of the wire harnesses in each partition level in an intuitive graphical way. By viewing these atlases, testers can clearly understand which wire harness segments are in a normally conducting state and which may have potential problems, providing a highly valuable reference for subsequent fault troubleshooting and repair work, effectively improving the efficiency and quality of engine wire harness maintenance.

[0049] In a preferred embodiment, performing path search on the programmable switch matrix based on the DFS algorithm includes: taking each relay unit node in the programmable switch matrix as the vertex of the graph, taking the connecting wire harnesses between the nodes as the edges of the graph, and constructing a path search graph; configuring a path stack structure, based on the path search graph, arbitrarily selecting a relay unit node in the corresponding partition level as the starting node, recording the node path from the starting node to the currently searched path node through the path stack structure, and identifying all nodes on the path to add them to the access marker array set; when accessing a new node, pushing the path corresponding to the new node into the path stack structure, adding the new node to the access marker array set, and determining whether the new node is a cut-off node, where the cut-off node is to determine that the current path wire harness is an abnormally conducting wire harness; when it is the cut-off node, storing the node path and popping the current node from the path stack, backtracking to the previous node, and continuing to search for the unvisited nodes outside the access marker array set until all nodes are added to the access marker array set to obtain multiple path conduction node atlases.

[0050] Exemplarily, performing path search on the programmable switch matrix based on the DFS (Depth-First Search) algorithm is a key step in accurately locating the conduction status of the wire harness. First, the system abstracts each relay unit node in the programmable switch matrix as a vertex in graph theory, and the wire harnesses used to connect signals between nodes are regarded as the edges of the graph. Through this mapping, a path search graph is constructed. It can be understood as drawing a map for the complex wire harness network, enabling subsequent search operations to follow rules. For example, in an engine wire harness system containing multiple relay units, relays A, B, C, etc. are like different locations on the map, and the connecting wire harnesses between them are like the roads connecting these locations.

[0051] Next, the system configures a path stack structure, which is used to record the complete path information from the starting node to the current search path node. Within the current partition level, the system randomly selects a relay unit node as the starting node, pushes it into the path stack structure, and at the same time adds this starting node to the access marker array set. This set can be understood as a "visited list", which is used to mark which nodes have been searched to avoid repeated searches.

[0052] When a new node is searched, the system immediately pushes the path corresponding to this new node into the path stack structure, that is, adds a new record to the path record, and at the same time adds the new node to the access marker array set and tags it as "visited". Subsequently, the system determines whether this new node is a cut-off node. Here, the cut-off node has a special meaning. It represents that the current path wire harness is determined to be an abnormal conduction wire harness, such as faults like open circuit or short circuit.

[0053] Suppose during the search process, when the system accesses the new node of relay D and it is detected that there is an open circuit in its connecting wire harness, then relay D will be determined as the cut-off node. At this time, the system will store the complete path from the starting node to the cut-off node D. This is like properly preserving a problematic "path clue". After that, the system pops the cut-off node D from the path stack and backtracks to the previous node to continue exploring the unvisited nodes outside the access marker array set. That is, it is like when exploring a maze, when finding that a road is blocked, retreating to the fork in the road and trying other directions.

[0054] By this continuous way of backtracking and continuing to search, the system will keep advancing until all nodes are added to the access marker array set, which means that all possible paths in the entire wire harness network have been thoroughly searched. Finally, the system can obtain multiple path conduction node atlases, which detail the path information of all normal conduction wire harnesses in the engine wire harness, providing strong data support for subsequent fault troubleshooting, wire harness optimization, etc.

[0055] In a preferred embodiment, the system also includes: checking whether the path corresponding to the new node exists in the path stack structure; if so, determining that a loop is found, pausing the current search, and recording the loop information, wherein the loop information includes the node sequence in the loop, the starting node and the ending node of the loop; marking the loop, bypassing the marked loop in subsequent searches, and continuing the search from other adjacent nodes of the starting node of the loop; after the search for non-loop nodes is completed, introducing additional test signals to perform a separate conductivity test on the loop node harness.

[0056] Furthermore, when the system explores a new node based on the path stack structure, it will simultaneously conduct a detailed check on the path corresponding to the current new node, and carefully check whether this path has already existed in the path stack structure. The path stack structure records the complete path information from the starting node to the current search path node. If the path corresponding to the new node already exists in it, this means that the system encountered a closed loop structure during the search process, that is, it is determined that a loop is found. For example, in the complex connection network of the engine harness, the system originally started from node A, passed through nodes B, C, and D. When searching for node E, it was found that the path from A to E partially or completely overlapped with a path recorded in the path stack, forming a closed loop similar to ABCDEA, which indicates that there is a loop. At this time, the system will immediately suspend the current search process to prevent falling into the dilemma of an infinite loop search. At the same time, the system will accurately record the loop information, which is like the "identity file" of the loop, and contains in detail the node sequence in the loop, that is, the arrangement of each node on the loop in the order of connection, and the starting node and the ending node of the loop (in the case of a loop, the starting node and the ending node are the same node).

[0057] After recording the loop information, the system will mark the loop specially, just like giving it a "processed" label. In the subsequent search process, the system will bypass the marked loop and continue searching from other adjacent nodes of the loop starting node. This is like exploring a maze and finding that a road is a dead end (loop), giving up decisively and looking for other possible exits (adjacent nodes).

[0058] After all non-loop nodes have been searched, it means that the system has fully checked most of the normal connection paths of the engine harness. At this time, the system will introduce additional test signals to perform a separate continuity test on the loop node harness. This additional test signal can more deeply and accurately detect whether the loop harness has potential problems such as open circuit, short circuit or poor contact. In this way, the system can not only avoid search confusion caused by loops, but also conduct targeted detection of loop harnesses, ensure the comprehensiveness and accuracy of the engine harness continuity test results, and provide a reliable basis for subsequent fault diagnosis and maintenance.

[0059] In a preferred embodiment, based on the engine wiring harness layout diagram, the path conduction node atlas corresponding to each partition is overlapped and mapped to obtain the wiring harness segment with abnormal marking in the topology diagram, including: coordinate matching of the path conduction node atlas corresponding to each partition according to the engine wiring harness layout diagram, using coordinate overlap mapping to superimpose and display the nodes and connection relationships in different partition atlases, and performing consistency check on the conduction status and connection properties of the nodes; if there is a conflict in the consistency check or the difference exceeds a preset threshold, the wiring harness segment is marked as a suspected abnormality and the wiring harness segment with abnormal marking in the topology diagram is determined.

[0060] Specifically, in order to accurately locate the abnormal position of the wiring harness, the system will conduct overlapping mapping analysis of multi-partition path conduction node atlases based on the engine wiring harness layout diagram. Specifically, the system will perform detailed coordinate matching operations on the path conduction node atlases corresponding to each partition based on the engine wiring harness layout diagram. These path conduction node atlases record the nodes and connection relationships of the normal conduction harnesses in each partition, and the coordinate matching ensures that different partition atlases can be compared and analyzed under the same coordinate system.

[0061] After completing the coordinate matching, the system uses the coordinate overlapping mapping technology to map the nodes and connection relationships in different partition graph sets like a puzzle. Figure 1 The nodes are displayed in a unified interface. At this time, the system will conduct a comprehensive and detailed consistency check on the conduction status and connection properties of all overlapping nodes. The conduction status of the node reflects whether the relay or wiring harness connection point represented by the node can transmit signals normally, and the connection properties involve key information such as the connection method between nodes and the direction of signal transmission.

[0062] For example, in a certain engine harness system, the path connectivity node atlas of partition A shows that a certain node is in a normal connectivity state, and its connection attribute with the adjacent node is unidirectional signal transmission; while the corresponding atlas of partition B shows that the connectivity state of the node is intermittent after the coordinates overlap, and the connection attribute also becomes bidirectional signal transmission, which is an obvious conflict. The system sets a preset threshold to measure the acceptable range of differences in node connectivity and connection attributes between different partitions. When a conflict or difference exceeding this preset threshold is found in the consistency check, it means that there may be potential problems in the harness segment, and the system will decisively mark the harness segment as suspected abnormality. These marked harness segments constitute the abnormally marked harness segments in the topology map.

[0063] In this way, the system can intuitively display the differences in the connectivity of wiring harnesses in different partitions, helping inspectors quickly lock in suspected abnormal areas, providing a clear target direction for subsequent in-depth fault diagnosis and repair work, and effectively improving the efficiency of engine wiring harness detection and maintenance.

[0064] In a preferred embodiment, analog signals are injected one by one into the abnormally labeled wire harness segments in the topology diagram for waveform analysis at the receiving end to obtain a set of abnormal wire harness segment identifiers, and physical repair guidance is executed, including: selecting an analog signal source according to the position and electrical characteristics of the abnormally labeled wire harness segments in the topology diagram, injecting the analog signal source into the abnormally labeled wire harness segments, and performing global detection in sequence, and collecting waveforms at the corresponding receiving end; comparing and analyzing the collected waveforms at the receiving end with the corresponding preset standard waveforms to obtain a set of abnormal wire harness segment identifiers, where the types of the identifiers include open circuit, short circuit, and poor contact; formulating a corresponding physical repair guidance plan based on the set of abnormal wire harness segment identifiers for repair work.

[0065] Specifically, technicians will customize a detection plan based on the specific position and electrical characteristics of the abnormally labeled wire harness segments in the topology diagram and carefully select a suitable analog signal source. These analog signal sources are like "signal probes" that can simulate the signal characteristics of the wire harness under actual working conditions and accurately inject them into the abnormally labeled wire harness segments to initiate global detection. After the signal injection, the system will perform waveform collection at the corresponding receiving end, and the receiving end records the changes in the signal after passing through the abnormal wire harness segment.

[0066] After the waveform collection is completed, the system will start the comparison and analysis process. It will carefully compare the collected waveforms at the receiving end with the corresponding preset standard waveforms set in advance. The preset standard waveforms reflect the signal characteristics that the wire harness should have under normal working conditions. Through this comparison, the system can keenly capture the specific abnormal conditions of the abnormal wire harness segments. For example, when there is an obvious interruption in the waveform at the receiving end, in sharp contrast to the continuous and stable signal in the preset standard waveform, the system will determine that there is an open circuit problem in this wire harness segment; if the waveform shows abnormal peaks or fluctuations and deviates too much from the preset standard waveform range, it may mean a short circuit fault; and if the waveform shows periodic attenuation or distortion, it may indicate a poor contact situation. Based on these comparison results, the system will generate a set of abnormal wire harness segment identifiers, clearly identifying the specific problem types of each abnormal wire harness segment, including open circuit, short circuit, and poor contact, etc.

[0067] Finally, based on this clear and definite set of abnormal wire harness segment identifiers, technicians can formulate a targeted physical repair guidance plan. For open circuit problems, it may be necessary to reconnect the wire harness or replace the damaged wire harness segment; for short circuit situations, carefully check and eliminate the abnormal conduction points between the wire harnesses; if it is a poor contact, it may be necessary to clean, tighten or replace the connector. According to these scientific and reasonable repair guidance plans, technicians can carry out repair work efficiently and accurately, ensuring that the engine wire harness resumes normal functions and guaranteeing the stability and reliability of the overall engine operation.

[0068] An electrical continuity test system for an engine wiring harness provided by an embodiment of the present invention has at least the following technical effects: 1. By obtaining the layout diagram of the engine wiring harness and arranging matrix relays to form a programmable switch matrix, an instruction trigger logic self-check process is designed on this basis. During self-check, the self-check control signal is sequentially sent to each relay unit, and the signal-action matching relationship and parameter deviation are strictly judged based on a preset standard response list. This mechanism can accurately identify the relays that fail to pass the execution response before the test and give a position warning, eliminating potential hardware failure hazards in advance, ensuring that the subsequent electrical continuity test based on the programmable switch matrix is carried out in a reliable hardware environment, significantly improving the stability and reliability of the entire test system, and avoiding test errors and invalid operations caused by hardware failures.

[0069] 2. Combining the layout diagram of the engine wiring harness, a hierarchical partition model is constructed based on the historical fault areas and fault frequencies. On this basis, a path search is performed on the programmable switch matrix based on the DFS algorithm. Through regional division and hierarchical partitioning, the complex wiring harness network is decomposed into multiple partition levels that can be tested in parallel. The DFS algorithm is used to batch verify the electrical continuity of multiple wiring harness segments, and a path conduction node atlas corresponding to each partition is obtained. In addition, during the execution of the DFS algorithm, a loop detection and processing mechanism is added to avoid getting stuck in an infinite loop search. After the non-loop node search is completed, the wiring harness of the loop node is separately tested for electrical continuity. This method combining multi-level, regional parallel testing with depth-first search, and a perfect loop processing mechanism greatly improves the efficiency and accuracy of fault location, and can quickly and accurately find the abnormal positions in the wiring harness.

[0070] 3. After obtaining the path conduction node atlas, by overlapping and mapping the atlases of each partition, a consistency check is performed on the node conduction state and connection attributes to accurately determine the wiring harness segments with abnormal topology markings. Subsequently, for these abnormal wiring harness segments, analog signal sources are selected for injection according to their positions and electrical characteristics, waveforms are collected at the receiving end and compared and analyzed with the preset standard waveforms to obtain an identification set including abnormal types such as open circuit, short circuit, and poor contact. Finally, a targeted physical repair guidance plan is formulated based on this set. This multi-stage comprehensive analysis process from abnormal wiring harness segment identification to waveform analysis and then to accurate repair guidance forms a complete closed-loop for fault troubleshooting and repair, which can provide clear repair directions and methods for technicians, effectively improving the efficiency and quality of engine wiring harness fault repair, and reducing maintenance costs and time.

[0071] Embodiment 2:

[0072] As Figure 2As shown, based on the same inventive concept as the conductivity test system for an engine wiring harness provided in Embodiment 1, an embodiment of the present invention further provides a method for testing the conductivity of an engine wiring harness, the method including: Obtain the layout diagram of the engine wiring harness, traverse the key nodes of the layout diagram of the engine wiring harness, arrange matrix relays, and obtain a programmable switch matrix.

[0073] Execute a logic self-check on the matrix relay through an instruction-triggered control signal to obtain an execution response set. If the results in the execution response set all indicate passing, activate the programmable switch matrix.

[0074] Combined with the layout diagram of the engine wiring harness, based on the hierarchical partition model and with the wiring harness conductivity as a constraint, perform path search on the programmable switch matrix based on the DFS algorithm to obtain multiple path conduction node atlases, where the multiple path conduction node atlases correspond one-to-one to the partitions in the hierarchical partition model.

[0075] Based on the layout diagram of the engine wiring harness, overlap and map the path conduction node atlas corresponding to each partition to obtain a wiring harness segment with abnormal topology annotation.

[0076] Inject a simulated signal into the wiring harness segment with abnormal topology annotation one by one for receiving-end waveform analysis to obtain a set of abnormal wiring harness segment identifiers, and perform physical repair guidance.

[0077] Further, the method further includes: if there is a result indicating non-passing in the execution response set, extract the relay with the non-passing indication for position warning processing.

[0078] Further, execute a logic self-check on the matrix relay through an instruction-triggered control signal to obtain an execution response set. If the results in the execution response set all indicate passing, activate the programmable switch matrix, including: trigger a self-check control signal through a wiring harness conductivity test start instruction, send the self-check control signal to each relay unit of the matrix relay in sequence, monitor the action response of each relay unit to obtain an execution response set; judge the signal-action matching relationship in the execution response set based on a preset standard response list. When the matching relationship is consistent with the relationship in the preset standard response list and the parameter deviation is not greater than the preset deviation threshold, mark the corresponding relay unit as passing; if the results in the execution response set all indicate passing, activate the programmable switch matrix for wiring harness conductivity test.

[0079] Further, in combination with the engine wiring harness layout diagram, based on the hierarchical partition model and with the wiring harness conductivity as a constraint, perform path search on the programmable switch matrix based on the DFS algorithm to obtain multiple path-conducting node atlases, including: obtaining the historical fault area, dividing the engine wiring harness layout diagram based on the fault frequency, constructing a hierarchical partition model based on the area division result, where each area corresponds to a partition level; using the wiring harness conductivity as a constraint, perform parallel tests on the wiring harness conductivity path search for the programmable switch matrix in different-level areas based on the DFS algorithm, batch verify the conductivity of multiple wiring harness segments, and obtain multiple path-conducting node atlases; where each partition level corresponds to a path-conducting node atlas, and the path-conducting node atlas is the path topology diagram of all normally-conducting wiring harnesses in the engine wiring harness layout diagram.

[0080] Further, performing path search on the programmable switch matrix based on the DFS algorithm includes: taking each relay unit node in the programmable switch matrix as the vertex of the graph, taking the connecting wiring harness between nodes as the edge of the graph, and constructing a path search graph; configuring a path stack structure, based on the path search graph, randomly select a relay unit node in the current partition level as the starting node, record the node path from the starting node to the currently searched path node through the path stack structure, and identify all nodes on the path and add them to the access marker array set; when accessing a new node, push the path corresponding to the new node into the path stack structure, add the new node to the access marker array set, and determine whether the new node is a cut-off node, where the cut-off node is to determine that the current path wiring harness is an abnormally-conducting wiring harness; when it is the cut-off node, store the node path and pop the current node from the path stack, backtrack to the previous node, and continue to search for the unvisited nodes outside the access marker array set until all nodes are added to the access marker array set to obtain multiple path-conducting node atlases.

[0081] Further, the method further includes: checking whether the path corresponding to the new node exists in the path stack structure, if it exists, it is determined that a loop is found, suspend the current search, and record the loop information, where the loop information includes the node sequence in the loop, the starting node and the ending node of the loop; mark the loop, bypass the marked loop in subsequent searches, and continue to search from other adjacent nodes of the starting node of the loop; after the non-loop nodes are searched, introduce an additional test signal to separately perform a conductivity test on the wiring harness of the loop nodes.

[0082] Further, based on the engine wiring harness layout diagram, the path conduction node atlases corresponding to each partition are overlapped and mapped to obtain the wiring harness segments with abnormal markings in the topology diagram, including: performing coordinate matching on the path conduction node atlases corresponding to each partition according to the engine wiring harness layout diagram, using coordinate overlapping mapping to superimpose and display the nodes and connection relationships in the atlases of different partitions, and performing consistency checks on the conduction states and connection attributes of the nodes; if there are conflicts or differences exceeding the preset threshold in the consistency check, mark the wiring harness segment as suspected abnormal and determine the wiring harness segments with abnormal markings in the topology diagram.

[0083] Further, inject analog signals into the wiring harness segments with abnormal markings in the topology diagram one by one for receiving-end waveform analysis to obtain a set of abnormal wiring harness segment identifiers, and perform physical repair guidance, including: according to the positions and electrical characteristics of the wiring harness segments with abnormal markings in the topology diagram, select an analog signal source to inject into the wiring harness segments with abnormal markings, perform global detection in sequence, and collect waveforms at the corresponding receiving ends; compare and analyze the collected receiving-end waveforms with the corresponding preset standard waveforms to obtain a set of abnormal wiring harness segment identifiers, where the types of the identifiers include open circuit, short circuit, and poor contact; formulate corresponding physical repair guidance plans based on the set of abnormal wiring harness segment identifiers for repair work.

[0084] It should be noted that the above sequence of embodiments of the present application is only for description and does not represent the superiority or inferiority of the embodiments. And the above specific embodiments of this specification have been described. The processes depicted in the drawings do not necessarily require the specific order and continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0085] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0086] This specification and the drawings are only exemplary descriptions of the present application and are considered to have covered any and all modifications, variations, combinations, or equivalents within the scope of the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalent technologies, the present application is intended to include these changes and modifications.

Claims

1. A conductivity test system for an engine wiring harness, characterized in that, The system includes: A control matrix layout module, which is used to obtain the engine wiring harness layout diagram, traverse the key nodes of the engine wiring harness layout diagram, layout matrix relays, and obtain a programmable switch matrix; A logic self-check module, which is used to perform logic self-check on the matrix relays by triggering a control signal through an instruction to obtain an execution response set. If all the results in the execution response set are marked as passed, activate the programmable switch matrix; A path search module, which is used to combine the engine wiring harness layout diagram, based on a hierarchical partition model, with wiring harness conductivity as a constraint, and perform path search on the programmable switch matrix based on the DFS algorithm to obtain multiple path-conducting node atlases, where each of the multiple path-conducting node atlases corresponds to a partition in the hierarchical partition model; An atlas mapping module, which is used to overlap and map the path-conducting node atlas corresponding to each partition based on the engine wiring harness layout diagram to obtain a wiring harness segment with abnormal topology annotation; A repair guidance module, which is used to inject simulation signals into the wiring harness segments with abnormal topology annotation one by one for receiving-end waveform analysis to obtain a set of abnormal wiring harness segment identifiers and perform physical repair guidance.

2. The conductivity testing system for an engine wiring harness according to claim 1, wherein, The system further includes: If there is a result marked as not passed in the execution response set, extract the relays marked as not passed for position warning processing.

3. The conductivity test system for an engine wiring harness according to claim 1, characterized in that The logic self-check module includes: Trigger a self-check control signal through a wiring harness conductivity test start instruction, sequentially send the self-check control signal to each relay unit of the matrix relay, monitor the action response of each relay unit, and obtain an execution response set; Judge the signal-action matching relationship in the execution response set based on a preset standard response list. When the matching relationship is consistent with the relationship in the preset standard response list and the parameter deviation is not greater than the preset deviation threshold, mark the corresponding relay unit as passed; If all the results in the execution response set are marked as passed, activate the programmable switch matrix for wiring harness conductivity test.

4. The conductivity testing system for an engine wiring harness according to claim 1, characterized in that, The path search module includes: Obtain the historical failure area, divide the engine wiring harness layout diagram based on the failure frequency, and construct a hierarchical partition model based on the area division result, where each area corresponds to a partition level; Use the wiring harness conductivity as a constraint, perform parallel tests on the wiring harness conductivity paths of the programmable switch matrix in different layer areas based on the DFS algorithm, batch verify the conductivity of multiple wiring harness segments, and obtain multiple path-conducting node atlases; Among them, each partition level corresponds to a path-conducting node atlas, and the path-conducting node atlas is the path topology diagram of all normally conducting wiring harnesses in the engine wiring harness layout diagram.

5. The conductivity test system for an engine wiring harness according to claim 4, wherein, The path search module further includes: Take each relay unit node in the programmable switch matrix as the vertex of the graph, and take the connecting wiring harness between the nodes as the edge of the graph to construct a path search graph; Configure a path stack structure. Based on the path search graph, select any relay unit node in the current partition level as the starting node, record the node path from the starting node to the currently searched path node through the path stack structure, and identify all the nodes on the path and add them to the access marker array set; When accessing a new node, push the path corresponding to the new node into the path stack structure, and add the new node to the access marker array set. Determine whether the new node is a cut-off node, where the cut-off node is used to determine that the current path harness is an abnormally conducting harness; When it is the cut-off node, store the node path and pop the current node from the path stack, backtrack to the previous node, and continue to search for unvisited nodes outside the access marker array set until all nodes are added to the access marker array set, obtaining multiple path-conducting node atlases.

6. The conductivity test system for an engine wiring harness according to claim 5, wherein The system further includes: Check whether the path corresponding to the new node exists in the path stack structure. If it exists, it is determined that a loop is found, the current search is paused, and loop information is recorded, where the loop information includes the node sequence in the loop, the start node and the end node of the loop; Mark the loop, bypass the marked loop in subsequent searches, and continue to search from other adjacent nodes of the start node of the loop; After the non-loop nodes are searched, introduce an additional test signal to conduct a conductivity test on the loop node harness alone.

7. The conductivity test system for an engine wiring harness according to claim 1, characterized in that, The atlas mapping module includes: Perform coordinate matching on the path-conducting node atlas corresponding to each partition according to the engine harness layout diagram, and use coordinate overlapping mapping to superimpose and display the nodes and connection relationships in the atlases of different partitions, and conduct a consistency check on the conduction state and connection attributes of the nodes; If there are conflicts or differences in the consistency check exceeding a preset threshold, mark the harness segment as suspected abnormal and determine the topological map abnormal annotation harness segment.

8. The conductivity test system for an engine wiring harness according to claim 1, characterized in that The repair guidance module includes: According to the position and electrical characteristics of the topological map abnormal annotation harness segment, select a simulation signal source to inject into the abnormal annotation harness segment, conduct global detection in sequence, and collect waveforms at the corresponding receiving end; Compare and analyze the waveforms collected at the receiving end with the corresponding preset standard waveforms to obtain a set of abnormal harness segment identifiers, where the types of the identifiers include open circuit, short circuit, and poor contact; Based on the set of abnormal harness segment identifiers, formulate a corresponding physical repair guidance plan for repair work.

9. A method for testing the conductivity of an engine wiring harness, characterized in that, The method is applied to a conductivity test system for an engine harness according to any one of claims 1-8. The method includes: Obtain the engine harness layout diagram, traverse the key nodes of the engine harness layout diagram, and arrange matrix relays to obtain a programmable switch matrix; Execute a logic self-check on the matrix relay through an instruction trigger control signal to obtain an execution response set. If the results in the execution response set all indicate passing, activate the programmable switch matrix; Combined with the engine harness layout diagram, based on the hierarchical partition model and with the harness conductivity as a constraint, perform path search on the programmable switch matrix based on the DFS algorithm to obtain multiple path-conducting node atlases, where the multiple path-conducting node atlases correspond one by one to the partitions in the hierarchical partition model; Based on the engine harness layout diagram, overlap and map the path-conducting node atlas corresponding to each partition to obtain the topological map abnormal annotation harness segment; Analyze the waveforms at the receiving end for the analog signals injected into the abnormal labeled wire harness segments in the topology diagram one by one, obtain the set of abnormal wire harness segment identifiers, and perform physical repair guidance.

10. The conductivity test method for an engine wiring harness according to claim 9, wherein, The method further includes: if there is an identification failure result in the execution response set, extract the relays with identification failures for position warning processing.

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