A method and system for detecting damage to automobile cable body

Abstract

The present invention relates to the technical field of cable measurement and detection, and more specifically to a method and system for detecting damage to an automobile cable body. The method comprises: obtaining the true electrical damage of the cable body within each initial adjacent detection point cluster based on the damage and electrical damage authenticity of the cable body within the initial adjacent detection point cluster; obtaining the transmitted electrical damage interference between any two initial adjacent detection point clusters based on the true electrical damage of the cable body of other initial adjacent detection point clusters between the two initial adjacent detection point clusters; obtaining the similarity-corrected distance between any two initial adjacent detection point clusters based on the transmitted electrical damage interference between the two initial adjacent detection point clusters and the difference in the cable body damage; and merging all initial adjacent detection point clusters based on the similarity-corrected distance to obtain the damaged area on the metal cable body of the automobile. The present invention improves the accuracy of automobile cable body damage detection results.

Description

Technical Field

[0001] The present invention relates to the technical field of cable measurement and detection, and in particular to a method and system for detecting damage to a cable body of an automobile cable. Background Art

[0002] Automotive cables (or cables) are commonly used connectors in automobiles, primarily enabling the operation of various vehicle systems through mechanical transmission. For example, cables are commonly found in control systems such as the throttle, clutch, handbrake, and transmission. Damage to the cable body can lead to poor operation, transmission failure, and even, in severe cases, impact driving safety. Therefore, detecting cable damage is crucial to ensuring vehicle reliability and safety.

[0003] For metal cables in automobiles, the resistance detection method is usually used to detect damage to the cable body. A constant current is injected into the cable through a detection instrument, and the voltage at both ends of the cable is measured. The resistance value of the cable is calculated according to Ohm's law, and the measured real-time resistance value is compared with a preset fixed threshold. If the resistance value exceeds the set safety range, it can be determined that the cable is damaged. However, in actual applications, if electrical damage occurs, it may affect the voltage in adjacent areas of the automobile cable through changes in current distribution. This influence will be transmitted to other detection points, resulting in misjudgment of damage at other detection points, and thus inaccurate detection results of automobile cable body damage. Summary of the Invention

[0004] The present invention provides a method and system for detecting damage to an automobile cable body to solve an existing problem: in actual applications, if electrical damage occurs, it may affect the voltage in adjacent areas of the automobile cable by changing the current distribution. This influence will be transmitted to other detection points, resulting in misjudgment of the damage to other detection points.

[0005] The present invention provides a method and system for detecting damage to a vehicle cable body using the following technical solutions:

[0006] The present invention provides a method for detecting damage to a cable body of an automobile, the method comprising the following steps:

[0007] Obtaining voltage data sequences at several detection points on the metal cable body of the vehicle;

[0008] Based on the distribution of test points on the metal cable body of the automobile, all test points are divided into several initial adjacent test point clusters; based on the difference in voltage data at the last test moment between the voltage data series of two test points in each initial adjacent test point cluster, the damage of the cable body within each initial adjacent test point cluster is obtained; based on the difference in voltage data at different test moments between the voltage data series of two test points in each initial adjacent test point cluster, the authenticity of electrical damage within each initial adjacent test point cluster is obtained; based on the damage of the cable body and the authenticity of electrical damage within the initial adjacent test point cluster, the true electrical damage of the cable body within each initial adjacent test point cluster is obtained;

[0009] The transmission electrical damage interference between any two initial adjacent detection point clusters is obtained based on the actual electrical damage of the cable body of other initial adjacent detection point clusters between them. The similarity correction distance between any two initial adjacent detection point clusters is obtained based on the transmission electrical damage interference between any two initial adjacent detection point clusters and the difference in the cable body damage.

[0010] All initial adjacent detection point clusters are merged based on the similarity-corrected distance to obtain the damaged area on the metal cable body of the car.

[0011] Preferably, the specific method of dividing all detection points into a number of initial adjacent detection point clusters according to the distribution of detection points on the metal cable body of the automobile is:

[0012] The two adjacent detection points are regarded as an initial adjacent monitoring point cluster.

[0013] Preferably, the specific method for obtaining the damage of the cable body in each initial adjacent detection point cluster based on the difference in voltage data at the last detection moment between the voltage data sequences of two detection points in each initial adjacent detection point cluster is:

[0014] The absolute value of the difference between the voltage data of the last detection moment between the voltage data sequences of two detection points in the qth initial adjacent detection point cluster is recorded as the voltage difference of the qth initial adjacent detection point cluster at the current moment; the ratio between the voltage difference of the qth initial adjacent detection point cluster at the current moment and the constant current value injected during the resistance method detection is recorded as the resistance of the qth initial adjacent detection point cluster at the current moment;

[0015] The ratio of the distance between two detection points in the qth initial adjacent detection point cluster to the cross-sectional area of ​​the metal cable body is recorded as the material factor of the metal cable body; the product of the resistivity of the metal cable body and the material factor of the metal cable body is recorded as the lossless resistance within the qth initial adjacent detection point cluster; the absolute value of the difference between the current moment resistance of the qth initial adjacent detection point cluster and the lossless resistance within the qth initial adjacent detection point cluster is taken as the damage of the cable body within the qth initial adjacent detection point cluster.

[0016] Preferably, the specific method for obtaining the authenticity of electrical damage in each initial adjacent detection point cluster based on the difference in voltage data at different detection moments between the voltage data sequences of two detection points in each initial adjacent detection point cluster is:

[0017] In the voltage data sequence of the detection point, all detection moments except the last detection moment are recorded as historical detection moments;

[0018] Obtain the characteristic value of the qth initial adjacent detection point cluster at each historical detection moment;

[0019] The reciprocal of the time interval between the i-th historical detection moment and the last detection moment is used as the influence weight factor of the i-th historical detection moment. The product of the characteristic value of the q-th initial adjacent detection point cluster at the i-th historical detection moment and the influence weight factor of the i-th historical detection moment is recorded as the electrical damage true factor of the q-th initial adjacent detection point cluster at the i-th historical detection moment.

[0020] The cumulative sum of the electrical damage authenticity factors of the qth initial adjacent detection point cluster at all historical detection moments is taken as the electrical damage authenticity within the qth initial adjacent detection point cluster.

[0021] Preferably, the specific method for obtaining the characteristic value of the qth initial adjacent detection point cluster at each historical detection moment is:

[0022] The difference in voltage data between the first detection point and the second detection point in the qth initial adjacent detection point cluster at the i-th historical detection moment in the voltage data sequence is recorded as the voltage difference of the qth initial adjacent detection point cluster at the i-th historical detection moment;

[0023] Preset three symbolic parameters a1, a2, and a3, and a1>a2>a3; if the voltage difference of the qth initial adjacent detection point cluster at the i-th historical detection moment is greater than 0, a1 is used as the characteristic value of the qth initial adjacent detection point cluster at the i-th historical detection moment; if the voltage difference of the qth initial adjacent detection point cluster at the i-th historical detection moment is equal to 0, a2 is used as the characteristic value of the qth initial adjacent detection point cluster at the i-th historical detection moment; if the voltage difference of the qth initial adjacent detection point cluster at the i-th historical detection moment is less than 0, a3 is used as the characteristic value of the qth initial adjacent detection point cluster at the i-th historical detection moment.

[0024] Preferably, the specific method for obtaining the true electrical damage of the cable body in each initial adjacent detection point cluster based on the damage of the cable body and the electrical damage authenticity in the initial adjacent detection point cluster is:

[0025] The normalized value of the difference between the voltage data at the last detection moment between the voltage data sequences of two detection points in the qth initial adjacent detection point cluster is recorded as the voltage drop factor; the product of the voltage drop factor, the electrical damage authenticity within the qth initial adjacent detection point cluster, and the cable body damage within the qth initial adjacent detection point cluster is taken as the true electrical damage of the cable body within the qth initial adjacent detection point cluster.

[0026] Preferably, the specific method for obtaining the transmission electrical damage interference between any two initial adjacent detection point clusters based on the real electrical damage of the cable body of other initial adjacent detection point clusters between any two initial adjacent detection point clusters is:

[0027] All initial adjacent detection point clusters between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster are recorded as influencing initial adjacent detection point clusters;

[0028] The ratio of the true electrical damage of the cable body that affects the kth initial adjacent detection point cluster to the number of all the clusters that affect the initial adjacent detection point cluster is recorded as the transfer influence factor that affects the kth initial adjacent detection point cluster; the sum of the true electrical damage of the cable body between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster is recorded as the first sum value; the ratio of the cumulative sum of all the transfer influence factors that affect the initial adjacent detection point clusters to the first sum value is recorded as the transfer electrical damage interference between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster.

[0029] Preferably, the specific method for obtaining the similarity correction distance between any two initial adjacent detection point clusters based on the transmission electrical damage interference between any two initial adjacent detection point clusters and the difference in cable body damage is:

[0030] The inversely proportional normalized value of the transferred electrical damage interference between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster is recorded as the first distance factor; the absolute value of the difference between the cable body damage in the qth initial adjacent detection point cluster and the cable body damage in the pth initial adjacent detection point cluster is recorded as the second distance factor; the product of the first distance factor and the second distance factor is taken as the similarity corrected distance between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster.

[0031] Preferably, the specific method of merging all initial adjacent detection point clusters based on the similarity-corrected distance to obtain the damaged area on the metal cable body of the automobile is:

[0032] A merging parameter E is preset, and all initial adjacent detection point clusters are randomly combined to obtain several detection point cluster combinations; among all detection point cluster combinations, the detection point cluster combination with the smallest similarity correction distance between two initial adjacent detection point clusters in the detection point cluster combination is recorded as the detection point cluster combination to be merged; all detection points in the detection point cluster combination to be merged are merged to obtain the detection point cluster after the first merger; the similarity correction distance between two initial adjacent detection point clusters in the detection point cluster combination to be merged is recorded as the merger factor of the detection point cluster after the first merger;

[0033] Obtain the similarity-corrected distance between the detection point cluster after the first merger and all other initial adjacent detection point clusters, and record the initial adjacent detection point cluster with the smallest similarity-corrected distance as the detection point cluster to be merged; merge the detection points in the detection point cluster to be merged with the detection points in the detection point cluster after the first merger to obtain the detection point cluster after the second merger; record the similarity-corrected distance between the detection point cluster to be merged and the detection point cluster after the first merger as the merging factor of the detection point cluster after the second merger;

[0034] The merging is stopped by analogy until the ratio of the merging factor between the latest merged detection point cluster and the previous merged detection point cluster is greater than or equal to the merging parameter E. The area formed by all the detection points in the latest merged detection point cluster is used as the damaged area on the metal cable body of the automobile.

[0035] The present invention also proposes a system for detecting damage to an automobile cable body, comprising a memory and a processor, wherein the processor executes a computer program stored in the memory to implement the steps of the above-mentioned method for detecting damage to an automobile cable body.

[0036] The beneficial effects of the technical solution of the present invention are as follows: the present invention obtains the true electrical damage of the cable body in each initial adjacent detection point cluster based on the damage of the cable body and the authenticity of electrical damage in the initial adjacent detection point cluster; obtains the transmission electrical damage interference between any two initial adjacent detection point clusters based on the true electrical damage of the cable body of other initial adjacent detection point clusters between any two initial adjacent detection point clusters; obtains the similarity correction distance between any two initial adjacent detection point clusters based on the transmission electrical damage interference between any two initial adjacent detection point clusters and the difference in the damage of the cable body; merges all initial adjacent detection point clusters based on the similarity correction distance to obtain the damaged area on the metal cable body of the automobile; thereby, the influence of some electrical interference transmitted through current distribution on other detection points can be more effectively eliminated, thereby improving the accuracy of the automobile cable body damage detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 This is a flowchart of the steps of a method for detecting damage to a cable body of an automobile according to the present invention;

[0039] Figure 2 The present invention is a flow chart showing the characteristic relationship of a method for detecting damage to a cable body of an automobile. DETAILED DESCRIPTION

[0040] To further illustrate the technical means and effectiveness of the present invention in achieving its intended objectives, the following, in conjunction with the accompanying drawings and preferred embodiments, describes in detail the specific implementation, structure, features, and effectiveness of a method and system for detecting damage to an automotive cable according to the present invention. In the following description, references to "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0041] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0042] The following describes in detail a method and system for detecting damage to a vehicle cable provided by the present invention with reference to the accompanying drawings.

[0043] See also Figure 1, which shows a flowchart of a method for detecting damage to an automobile cable body provided by one embodiment of the present invention, the method comprising the following steps:

[0044] Step S001: obtaining a voltage data sequence of several detection points on a metal cable body of a vehicle.

[0045] In a specific implementation of the embodiment of the present invention, a specific method for collecting voltage data sequences at several detection points on a metal cable body of an automobile is as follows:

[0046] A detection parameter N is preset, wherein this embodiment is described by taking N=50 as an example, and this embodiment is not specifically limited thereto, wherein N is determined according to specific implementation conditions;

[0047] N detection points are evenly divided on the metal cable body of the car, and a voltage sensor is arranged at each detection point;

[0048] For any detection point, every 1 second is a detection moment. After injecting a constant current on one side of the cable each time, the voltage data of the arbitrary detection point is collected using a voltage sensor for a total of 30 minutes; the voltage data at each detection moment is used as the voltage data sequence of the arbitrary detection point.

[0049] So far, the voltage data sequence of several detection points on the metal cable body of the automobile has been obtained through the above method.

[0050] Step S002: Based on the distribution of detection points on the metal cable body of the automobile, all detection points are divided into several initial adjacent detection point clusters; based on the difference in voltage data at the last detection moment between the voltage data sequences of two detection points in each initial adjacent detection point cluster, the damage of the cable body in each initial adjacent detection point cluster is obtained; based on the difference in voltage data at different detection moments between the voltage data sequences of two detection points in each initial adjacent detection point cluster, the authenticity of electrical damage in each initial adjacent detection point cluster is obtained; based on the damage of the cable body and the authenticity of electrical damage in the initial adjacent detection point cluster, the true electrical damage of the cable body in each initial adjacent detection point cluster is obtained.

[0051] It should be noted that for metal cables in automobiles, the resistance detection method is usually used to detect damage to the cable body. A constant current is injected into the cable through a detection instrument, and the voltage at both ends of the cable is measured. The resistance value of the cable is calculated according to Ohm's law, and the measured real-time resistance value is compared with a preset fixed threshold. If the resistance value exceeds the set safety range, it can be determined that the cable is damaged. However, in actual applications, if electrical damage occurs, it may affect the voltage in adjacent areas through changes in current distribution. This influence will be transmitted to other detection points, resulting in misjudgment of the damage to other detection points. Therefore, it is necessary to obtain the damage to the cable body within each initial cluster of adjacent detection points.

[0052] Preferably, in some implementations of the embodiments of the present invention, the specific method of dividing all detection points into a number of initial adjacent detection point clusters according to the distribution of detection points on the metal cable body of the automobile is:

[0053] The first detection point and the second detection point are combined into the first initial adjacent detection point cluster; the second detection point and the third detection point are combined into the second initial adjacent detection point cluster; the third detection point and the fourth detection point are combined into the third initial adjacent detection point cluster; and so on, all detection points are divided into several initial adjacent detection point clusters.

[0054] Preferably, in some implementations of the embodiments of the present invention, the specific method for obtaining the damage of the cable body in each initial adjacent detection point cluster based on the difference in voltage data at the last detection moment between the voltage data sequences of two detection points in each initial adjacent detection point cluster is:

[0055] The absolute value of the difference between the voltage data of the last detection moment between the voltage data sequences of two detection points in the qth initial adjacent detection point cluster is recorded as the voltage difference of the qth initial adjacent detection point cluster at the current moment; the ratio between the voltage difference of the qth initial adjacent detection point cluster at the current moment and the constant current value injected during the resistance method detection is recorded as the resistance of the qth initial adjacent detection point cluster at the current moment;

[0056] The ratio of the distance between two detection points in the qth initial adjacent detection point cluster to the cross-sectional area of ​​the metal cable body is recorded as the material factor of the metal cable body; the product of the resistivity of the metal cable body and the material factor of the metal cable body is recorded as the lossless resistance in the qth initial adjacent detection point cluster; the absolute value of the difference between the current moment resistance of the qth initial adjacent detection point cluster and the lossless resistance in the qth initial adjacent detection point cluster is recorded as the damage of the cable body in the qth initial adjacent detection point cluster;

[0057] The specific formula is:

[0058]

[0059] Where W q Indicates the damage of the cable body in the qth initial adjacent detection point cluster; U1 q U2 represents the voltage data at the last detection moment in the voltage data sequence of the first detection point in the qth initial adjacent detection point cluster; q represents the voltage data of the last detection moment in the voltage data sequence of the second detection point in the qth initial adjacent detection point cluster; I represents the constant current value injected during resistance method detection; ρ represents the resistivity of the metal cable body; L q represents the distance between two detection points in the qth initial adjacent detection point cluster; S represents the cross-sectional area of ​​the metal cable body; || represents the absolute value.

[0060] It should be noted that when using the resistance method for detection, a constant current needs to be input at the input end. The voltage is maximum when the current just starts to flow. As the current passes through the metal cable body, due to the resistance of the metal cable body, a part of the voltage is gradually lost at each detection point. Therefore, the whole process is a process of gradual voltage data decrease, that is, the voltage is gradually reduced in the metal cable body; therefore, for each initial adjacent detection point cluster, the voltage data sequence of its detection point must conform to the characteristics of the voltage drop; since the damage to the voltage data will have a continuous impact on the time series, the authenticity of the historical credibility data will affect the authenticity of the current damage detection, that is, the farther the historical data is from the current detection moment, the smaller the impact value provided should be.

[0061] Preferably, in some implementations of the embodiments of the present invention, based on the difference in voltage data at different detection moments between voltage data sequences of two detection points in each initial adjacent detection point cluster, a specific method for obtaining the authenticity of electrical damage in each initial adjacent detection point cluster is as follows:

[0062] Three symbolic parameters a1, a2, and a3 are preset, and a1>a2>a3. This embodiment is described by taking a1=1, a2=0, and a3=-1 as an example, and this embodiment is not specifically limited.

[0063] In the voltage data sequence of the detection point, all detection moments except the last detection moment are recorded as historical detection moments;

[0064] The difference in voltage data between the first detection point and the second detection point in the qth initial adjacent detection point cluster at the i-th historical detection moment in the voltage data sequence is recorded as the voltage difference of the qth initial adjacent detection point cluster at the i-th historical detection moment;

[0065] If the voltage difference of the qth initial adjacent detection point cluster at the i-th historical detection time is greater than 0, a1 is used as the characteristic value of the qth initial adjacent detection point cluster at the i-th historical detection time; if the voltage difference of the qth initial adjacent detection point cluster at the i-th historical detection time is equal to 0, a2 is used as the characteristic value of the qth initial adjacent detection point cluster at the i-th historical detection time; if the voltage difference of the qth initial adjacent detection point cluster at the i-th historical detection time is less than 0, a3 is used as the characteristic value of the qth initial adjacent detection point cluster at the i-th historical detection time;

[0066] The reciprocal of the time interval between the i-th historical detection moment and the last detection moment is used as the influence weight factor of the i-th historical detection moment. The product of the characteristic value of the q-th initial adjacent detection point cluster at the i-th historical detection moment and the influence weight factor of the i-th historical detection moment is recorded as the electrical damage true factor of the q-th initial adjacent detection point cluster at the i-th historical detection moment.

[0067] The cumulative sum of the electrical damage authenticity factors of the qth initial adjacent detection point cluster at all historical detection moments is taken as the electrical damage authenticity within the qth initial adjacent detection point cluster;

[0068] The specific formula is:

[0069]

[0070] Where Y q represents the authenticity of the electrical damage in the qth initial adjacent detection point cluster; M represents the number of all historical detection moments in the voltage data sequence of the detection point; U1 q,i U2 represents the voltage data of the i-th historical detection moment in the voltage data sequence of the first detection point in the q-th initial adjacent detection point cluster; q,i represents the voltage data of the i-th historical detection moment in the voltage data sequence of the second detection point in the q-th initial adjacent detection point cluster; t i represents the time interval between the i-th historical detection moment and the last detection moment; sgn() represents the sign function.

[0071] It should be noted that physical damage such as wear and cracks on the metal cable body is usually local and will not be directly transmitted to other initial adjacent detection point clusters. However, electrical damage may affect the voltage in adjacent areas by changing the current distribution. This impact will be transmitted to different initial adjacent detection point clusters. Therefore, it is necessary to determine the actual electrical damage of the cable body in each initial adjacent detection point cluster.

[0072] Preferably, in some implementations of the embodiments of the present invention, since electrical interference is caused by changing current distribution, resistance changes, load changes, and system impedance, for example, electrical interference may cause resonance or transient phenomena within the system. This phenomenon is particularly obvious when abnormal interactions occur between electrical components. Resonance may cause a sharp increase in current within certain frequency ranges, thereby causing a significant change in voltage drop. Therefore, when judging the electrical damage of the metal cable body, it is necessary to obtain the authenticity of the damage of the metal cable body based on the damage and electrical damage authenticity of the cable body within the initial adjacent detection point cluster. The specific method for obtaining the true electrical damage of the cable body within each initial adjacent detection point cluster based on the damage and electrical damage authenticity of the cable body within the initial adjacent detection point cluster is:

[0073] The normalized value of the difference between the voltage data of the last detection moment between the voltage data series of two detection points in the qth initial adjacent detection point cluster is recorded as the voltage drop factor; the product of the voltage drop factor, the electrical damage authenticity in the qth initial adjacent detection point cluster, and the cable body damage in the qth initial adjacent detection point cluster is taken as the cable body true electrical damage in the qth initial adjacent detection point cluster;

[0074] The specific formula is:

[0075] WD q =W q ×Y q ×norm(U1 q -U2 q )

[0076] Where, WD q W represents the actual electrical damage of the cable body within the qth initial adjacent detection point cluster; q Y represents the damage of the cable body in the qth initial adjacent detection point cluster; q Indicates the authenticity of electrical damage within the qth initial adjacent detection point cluster; U1 q U2 represents the voltage data at the last detection moment in the voltage data sequence of the first detection point in the qth initial adjacent detection point cluster; q represents the voltage data at the last detection moment in the voltage data sequence of the second detection point in the qth initial adjacent detection point cluster; norm() represents the linear normalization function.

[0077] So far, the true electrical damage of the cable body in each initial adjacent detection point cluster is obtained through the above method.

[0078] Step S003: Obtain the transmission electrical damage interference between any two initial adjacent detection point clusters based on the actual electrical damage of the cable body of other initial adjacent detection point clusters between any two initial adjacent detection point clusters; obtain the similarity correction distance between any two initial adjacent detection point clusters based on the transmission electrical damage interference between any two initial adjacent detection point clusters and the difference in the cable body damage.

[0079] It should be noted that electrical damage will affect the voltage in adjacent areas by changing the current distribution, and thus affect other initial adjacent detection point clusters; therefore, when analyzing any two initial adjacent detection point clusters, it is necessary to determine whether there is a potential impact of electrical interference between them, that is, when the electrical damage of these two initial adjacent detection point clusters is relatively small, and there is a cluster with relatively large electrical damage between them, these two initial adjacent detection point clusters will be subject to electrical interference from the initial adjacent detection point cluster with relatively large damage in the middle. This also shows that although the electrical damage of the two initial adjacent detection point clusters themselves is relatively small, due to the large damage of the middle initial adjacent detection point cluster, it may be propagated through changes in voltage and current, causing the electrical performance of the two initial adjacent detection point clusters to be affected.

[0080] Preferably, in some implementations of the embodiments of the present invention, a specific method for obtaining the transmission electrical damage interference between any two initial adjacent detection point clusters based on the actual electrical damage of the cable body of other initial adjacent detection point clusters between the two initial adjacent detection point clusters is:

[0081] All initial adjacent detection point clusters between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster are recorded as influencing initial adjacent detection point clusters;

[0082] The ratio of the true electrical damage of the cable body that affects the kth initial adjacent detection point cluster to the number of all the clusters that affect the initial adjacent detection point cluster is recorded as the transmission influence factor of the kth initial adjacent detection point cluster; the sum of the true electrical damage of the cable body between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster is recorded as the first sum value; the ratio of the cumulative sum of all the transmission influence factors that affect the initial adjacent detection point clusters to the first sum value is recorded as the transmission electrical damage interference between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster;

[0083] The specific formula is:

[0084]

[0085] Where C q,p WD represents the transmission electrical damage interference between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster; qrepresents the actual electrical damage of the cable body within the qth initial adjacent detection point cluster; WD p represents the actual electrical damage of the cable body within the pth initial adjacent detection point cluster; M q,p represents the number of all initial adjacent detection point clusters between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster; WD q,p,k It represents the real electrical damage of the cable body of the kth initial adjacent detection point cluster between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster.

[0086] It should be noted that this embodiment automatically identifies damaged areas by clustering areas with similar damage characteristics; in this clustering process, the greater the damage difference between the initial adjacent monitoring point clusters, the larger the distance between them should be, so as to accurately reflect the degree of damage and differences of each cluster; and since electrical damage may cause interference, it will affect the relative distance between the initial adjacent monitoring point clusters by changing the current and voltage distribution. Therefore, electrical damage may cause the distance between two initial adjacent monitoring point clusters to be artificially changed, resulting in inaccurate distance calculation; in order to overcome this problem, this step reduces the distance between the initial adjacent monitoring point clusters affected by electrical damage interference through appropriate adjustments to ensure the accuracy of the clustering process.

[0087] Preferably, in some implementations of the embodiments of the present invention, when the damage difference between any two initial adjacent monitoring point clusters is large, it may be due to interference from electrical damage. Therefore, the actual physical distance between the two clusters may not need to be so far. Therefore, the influence of electrical damage is taken into account when calculating the cluster distance, so that the distance between the two initial adjacent monitoring point clusters needs to be corrected and reduced to more realistically reflect the similarity between the damaged areas. Based on the transmitted electrical damage interference between any two initial adjacent detection point clusters and the difference in cable body damage, the specific method for obtaining the similarity correction distance between any two initial adjacent detection point clusters is as follows:

[0088] The inversely proportional normalized value of the transferred electrical damage interference between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster is recorded as the first distance factor; the absolute value of the difference between the cable body damage in the qth initial adjacent detection point cluster and the cable body damage in the pth initial adjacent detection point cluster is recorded as the second distance factor; the product of the first distance factor and the second distance factor is used as the similarity correction distance between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster;

[0089] The specific formula is:

[0090] d q,p =exp(-C q,p )×|W q-W p |

[0091] Where, d q,p represents the similarity correction distance between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster; C q,p W represents the transmission electrical damage interference between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster; q W represents the damage of the cable body in the qth initial adjacent detection point cluster; p Indicates the damage of the cable body within the pth initial adjacent detection point cluster; || indicates taking the absolute value; exp() represents an exponential function with a natural constant as the base. The embodiment adopts the exp(-x) model to present the inverse proportional relationship and normalization processing, and x is the input of the model. The implementer can select the inverse proportional function and normalization function according to the actual situation.

[0092] So far, the similarity-corrected distance between any two initial adjacent detection point clusters is obtained through the above method.

[0093] Step S004: merging all initial adjacent detection point clusters based on the similarity-corrected distance to obtain the damaged area on the metal cable body of the automobile.

[0094] Preferably, in some implementations of the embodiments of the present invention, a specific method for merging all initial adjacent detection point clusters based on similarity-corrected distances to obtain the damaged area on the metal cable body of the automobile is as follows:

[0095] A merging parameter E is preset, wherein this embodiment is described by taking E=1.05 as an example, and this embodiment is not specifically limited, wherein E is determined according to specific implementation conditions;

[0096] All initial adjacent detection point clusters are randomly combined in pairs to obtain several detection point cluster combinations; among all detection point cluster combinations, the detection point cluster combination with the smallest similarity correction distance between two initial adjacent detection point clusters in the detection point cluster combination is recorded as the detection point cluster combination to be merged; all detection points in the detection point cluster combination to be merged are merged to obtain the detection point cluster after the first merger; the similarity correction distance between two initial adjacent detection point clusters in the detection point cluster combination to be merged is recorded as the merger factor of the detection point cluster after the first merger;

[0097] Obtain the similarity-corrected distance between the detection point cluster after the first merger and all other initial adjacent detection point clusters, and record the initial adjacent detection point cluster with the smallest similarity-corrected distance as the detection point cluster to be merged; merge the detection points in the detection point cluster to be merged with the detection points in the detection point cluster after the first merger to obtain the detection point cluster after the second merger; record the similarity-corrected distance between the detection point cluster to be merged and the detection point cluster after the first merger as the merging factor of the detection point cluster after the second merger;

[0098] Obtain the similarity-corrected distance between the detection point cluster after the second merger and all other initial adjacent detection point clusters, and record the initial adjacent detection point cluster with the smallest similarity-corrected distance as the detection point cluster to be merged; merge the detection points in the detection point cluster to be merged with the detection points in the detection point cluster after the second merger to obtain the detection point cluster after the third merger; record the similarity-corrected distance between the detection point cluster to be merged and the detection point cluster after the second merger as the merging factor of the detection point cluster after the third merger;

[0099] The merging is stopped by analogy until the ratio of the merging factor between the latest merged detection point cluster and the previous merged detection point cluster is greater than or equal to the merging parameter E. The area formed by all the detection points in the latest merged detection point cluster is used as the damaged area on the metal cable body of the automobile.

[0100] The damaged area on the metal cable body of the car is transmitted to the system, triggering an alarm and helping maintenance personnel to quickly locate the damaged area.

[0101] Through the above steps, a method for detecting damage to a car cable body is completed;

[0102] See also Figure 2 , which shows a characteristic relationship flow chart of a method for detecting damage to an automobile cable body.

[0103] Another embodiment of the present invention provides a system for detecting damage to a cable body of an automobile. The system includes a memory and a processor. When the processor executes a computer program stored in the memory, the processor performs steps S001 to S004 of the above method.

[0104] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for detecting damage to a car cable, characterized in that: The method comprises the following steps: Obtaining voltage data sequences at several detection points on the metal cable body of the vehicle; Based on the distribution of test points on the metal cable body of the automobile, all test points are divided into several initial adjacent test point clusters; based on the difference in voltage data at the last test moment between the voltage data series of two test points in each initial adjacent test point cluster, the damage of the cable body within each initial adjacent test point cluster is obtained; based on the difference in voltage data at different test moments between the voltage data series of two test points in each initial adjacent test point cluster, the authenticity of electrical damage within each initial adjacent test point cluster is obtained; based on the damage of the cable body and the authenticity of electrical damage within the initial adjacent test point cluster, the true electrical damage of the cable body within each initial adjacent test point cluster is obtained; The transmission electrical damage interference between any two initial adjacent detection point clusters is obtained based on the actual electrical damage of the cable body of other initial adjacent detection point clusters between them. The similarity correction distance between any two initial adjacent detection point clusters is obtained based on the transmission electrical damage interference between any two initial adjacent detection point clusters and the difference in the cable body damage. All initial adjacent detection point clusters are merged based on the similarity-corrected distance to obtain the damaged area on the metal cable body of the car.

2. A method for detecting damage to a car cable according to claim 1, characterized in that: The specific method of dividing all detection points into a number of initial adjacent detection point clusters according to the distribution of detection points on the metal cable body of the automobile is as follows: The two adjacent detection points are regarded as an initial adjacent monitoring point cluster.

3. The method for detecting damage to an automobile cable according to claim 1, wherein: The specific method for obtaining the damage of the cable body in each initial adjacent detection point cluster based on the difference in voltage data at the last detection moment between the voltage data sequences of two detection points in each initial adjacent detection point cluster is: The absolute value of the difference between the voltage data of the last detection moment between the voltage data sequences of two detection points in the qth initial adjacent detection point cluster is recorded as the voltage difference of the qth initial adjacent detection point cluster at the current moment; the ratio between the voltage difference of the qth initial adjacent detection point cluster at the current moment and the constant current value injected during the resistance method detection is recorded as the resistance of the qth initial adjacent detection point cluster at the current moment; The ratio of the distance between two detection points in the qth initial adjacent detection point cluster to the cross-sectional area of ​​the metal cable body is recorded as the material factor of the metal cable body; the product of the resistivity of the metal cable body and the material factor of the metal cable body is recorded as the lossless resistance within the qth initial adjacent detection point cluster; the absolute value of the difference between the current moment resistance of the qth initial adjacent detection point cluster and the lossless resistance within the qth initial adjacent detection point cluster is taken as the damage of the cable body within the qth initial adjacent detection point cluster.

4. The method for detecting damage to an automobile cable according to claim 1, wherein: The specific method for obtaining the authenticity of electrical damage in each initial adjacent detection point cluster based on the difference in voltage data at different detection times between the voltage data sequences of two detection points in each initial adjacent detection point cluster is: In the voltage data sequence of the detection point, all detection moments except the last detection moment are recorded as historical detection moments; Obtain the characteristic value of the qth initial adjacent detection point cluster at each historical detection moment; The reciprocal of the time interval between the i-th historical detection moment and the last detection moment is used as the influence weight factor of the i-th historical detection moment; The product of the characteristic value of the qth initial adjacent detection point cluster at the i-th historical detection moment and the influence weight factor at the i-th historical detection moment is recorded as the electrical damage true factor of the qth initial adjacent detection point cluster at the i-th historical detection moment; The cumulative sum of the electrical damage authenticity factors of the qth initial adjacent detection point cluster at all historical detection moments is taken as the electrical damage authenticity within the qth initial adjacent detection point cluster.

5. The method for detecting damage to an automobile cable according to claim 4, characterized in that: The specific method for obtaining the characteristic value of the qth initial adjacent detection point cluster at each historical detection moment is: The difference in voltage data between the first detection point and the second detection point in the qth initial adjacent detection point cluster at the i-th historical detection moment in the voltage data sequence is recorded as the voltage difference of the qth initial adjacent detection point cluster at the i-th historical detection moment; Three symbolic parameters a1, a2, and a3 are preset, and a1>a2>a3; if the voltage difference of the qth initial adjacent detection point cluster at the i-th historical detection time is greater than 0, a1 is used as the characteristic value of the qth initial adjacent detection point cluster at the i-th historical detection time; If the voltage difference of the qth initial adjacent detection point cluster at the i-th historical detection time is equal to 0, a2 is used as the characteristic value of the qth initial adjacent detection point cluster at the i-th historical detection time; If the voltage difference of the qth initial adjacent detection point cluster at the i-th historical detection time is less than 0, a3 is used as the characteristic value of the qth initial adjacent detection point cluster at the i-th historical detection time.

6. The method for detecting damage to an automobile cable according to claim 1, characterized in that: The specific method for obtaining the true electrical damage of the cable body in each initial adjacent detection point cluster based on the damage and electrical damage authenticity of the cable body in the initial adjacent detection point cluster is: The normalized value of the difference between the voltage data of the last detection moment between the voltage data sequences of two detection points in the qth initial adjacent detection point cluster is recorded as the voltage drop factor; The product of the voltage drop factor, the electrical damage authenticity within the qth initial adjacent detection point cluster, and the cable body damage within the qth initial adjacent detection point cluster is taken as the cable body true electrical damage within the qth initial adjacent detection point cluster.

7. The method for detecting damage to an automobile cable according to claim 1, characterized in that: The specific method for obtaining the transmission electrical damage interference between any two initial adjacent detection point clusters based on the real electrical damage of the cable body of other initial adjacent detection point clusters between any two initial adjacent detection point clusters is: All initial adjacent detection point clusters between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster are recorded as influencing initial adjacent detection point clusters; The ratio of the true electrical damage of the cable body that affects the kth initial adjacent detection point cluster to the number of all the clusters that affect the initial adjacent detection point cluster is recorded as the transfer influence factor that affects the kth initial adjacent detection point cluster; the sum of the true electrical damage of the cable body between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster is recorded as the first sum value; the ratio of the cumulative sum of all the transfer influence factors that affect the initial adjacent detection point clusters to the first sum value is recorded as the transfer electrical damage interference between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster.

8. The method for detecting damage to an automobile cable according to claim 1, characterized in that: The specific method for obtaining the similarity correction distance between any two initial adjacent detection point clusters based on the transmission electrical damage interference between any two initial adjacent detection point clusters and the difference in the damage of the cable body is: The inversely proportional normalized value of the transmission electrical damage interference between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster is recorded as the first distance factor; The absolute value of the difference between the damage of the cable body in the qth initial adjacent detection point cluster and the damage of the cable body in the pth initial adjacent detection point cluster is recorded as the second distance factor; The product of the first distance factor and the second distance factor is used as the similarity correction distance between the qth initial adjacent detection point cluster and the pth initial adjacent detection point cluster.

9. The method for detecting damage to an automobile cable according to claim 1, characterized in that: The specific method of merging all initial adjacent detection point clusters based on the similarity-corrected distance to obtain the damaged area on the metal cable body of the automobile is as follows: A merging parameter E is preset, and all initial adjacent detection point clusters are randomly combined to obtain several detection point cluster combinations; among all the detection point cluster combinations, the detection point cluster combination with the smallest similarity correction distance between two initial adjacent detection point clusters is recorded as the detection point cluster combination to be merged; Merge all detection points in the detection point cluster combination to be merged to obtain the detection point cluster after the first merger; record the similarity correction distance between two initial adjacent detection point clusters in the detection point cluster combination to be merged as the merger factor of the detection point cluster after the first merger; Obtain the similarity-corrected distances between the detection point cluster after the first merger and all other initial adjacent detection point clusters, and record the initial adjacent detection point cluster with the smallest similarity-corrected distance as the detection point cluster to be merged; Merge the detection points in the detection point cluster to be merged with the detection points in the detection point cluster after the first merger to obtain the detection point cluster after the second merger; The similarity-corrected distance between the detection point cluster to be merged and the detection point cluster after the first merger is recorded as the merging factor of the detection point cluster after the second merger; The merging is stopped by analogy until the ratio of the merging factor between the latest merged detection point cluster and the previous merged detection point cluster is greater than or equal to the merging parameter E. The area formed by all the detection points in the latest merged detection point cluster is used as the damaged area on the metal cable body of the automobile.

10. A system for detecting damage to a cable body of an automobile, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the computer program is executed by a processor, the steps of the method for detecting damage to a car cable body as described in any one of claims 1 to 9 are implemented.

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