Automobile inhaul cable body damage detection method and system

Abstract

The invention relates to the technical field of inhaul cable measurement and detection, in particular to an automobile inhaul cable body damage detection method and system, and the method comprises the steps: obtaining the real electrical damage of a cable body in each initial adjacent detection point cluster according to the damage and electrical damage authenticity of the inhaul cable body in the initial adjacent detection point cluster; acquiring transmission electrical damage interference between any two initial adjacent detection point clusters according to cable body real electrical damage of other initial adjacent detection point clusters between any two initial adjacent detection point clusters; obtaining a similarity correction distance between any two initial adjacent detection point clusters according to the transmission electrical damage interference between any two initial adjacent detection point clusters and the damage difference of the inhaul cable body; and combining all the initial adjacent detection point clusters based on the similar correction distance to obtain a damaged area on the metal inhaul cable body of the automobile. According to the invention, the accuracy of the damage detection result of the automobile inhaul cable body is improved.

Description

Technical Field

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

[0002] Automotive cables (or called wire ropes) are commonly used connectors in automobiles, and their main function is to achieve operations between various vehicle systems through mechanical transmission. For example, cables are commonly found in control systems such as vehicle throttles, clutches, hand brakes, and transmissions. Damage to the cable body of a cable may cause malfunctioning of operations and transmission failure, and in severe cases, it may even affect driving safety. Therefore, detecting damage to the cable is crucial for ensuring the reliability and safety of automobiles;

[0003] For metal cables in automotive cables, the resistance detection method is usually used to detect damage to their cable bodies; a constant current is injected into the cable through a detection instrument, and the voltage at both ends of the cable is measured. According to Ohm's law, the resistance value of the cable is calculated, 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 on the automotive cable through changes in the current distribution, and this influence will be transmitted to other detection points, resulting in misjudgment of damage to other detection points, and thus inaccurate detection results for damage to the cable body of the automotive cable. Summary of the Invention

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

[0005] The method and system for detecting damage to the cable body of an automotive cable of the present invention adopt the following technical solutions:

[0006] The present invention proposes a method for detecting damage to the cable body of an automotive cable, and the method includes the following steps:

[0007] Obtain voltage data sequences of a plurality of detection points on the cable body of the metal cable of the vehicle;

[0008] According to the distribution of detection points on the metal cable body of the vehicle, all detection points are divided into several initial adjacent detection point clusters; according to the difference in the voltage data at the last detection moment between the voltage data sequences of two detection points in each initial adjacent detection point cluster, the cable body damage of each initial adjacent detection point cluster is obtained; according to the difference in the 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; according to the cable body damage 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;

[0009] According to the true electrical damage of the cable body of other initial adjacent detection point clusters between any two initial adjacent detection point clusters, the transmission electrical damage interference between any two initial adjacent detection point clusters is obtained; according to the transmission electrical damage interference between any two initial adjacent detection point clusters and the difference in cable body damage, the similarity correction distance between any two initial adjacent detection point clusters is obtained;

[0010] Based on the similarity correction distance, all initial adjacent detection point clusters are merged to obtain the damage area on the metal cable body of the vehicle.

[0011] Preferably, the specific method for dividing all detection points into several initial adjacent detection point clusters according to the distribution of detection points on the metal cable body of the vehicle is as follows:

[0012] Two adjacent detection points are used as an initial adjacent monitoring point cluster.

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

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

[0015] The ratio of the distance between two detection points in the q-th initial adjacent detection point cluster to the cross-sectional area of the metal cable body is denoted 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 denoted as the non-destructive resistance within the q-th initial adjacent detection point cluster; the absolute value of the difference between the resistance at the current moment of the q-th initial adjacent detection point cluster and the non-destructive resistance within the q-th initial adjacent detection point cluster is taken as the damage of the cable body within the q-th initial adjacent detection point cluster.

[0016] Preferably, the specific method for obtaining the electrical damage authenticity within each initial adjacent detection point cluster according to 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 as follows:

[0017] In the voltage data sequence of the detection point, all detection times except the last detection time are denoted as historical detection times;

[0018] Obtain the characteristic value of the q-th initial adjacent detection point cluster at each historical detection time;

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

[0020] The sum of the electrical damage true factors of the q-th initial adjacent detection point cluster at all historical detection times is taken as the electrical damage authenticity within the q-th initial adjacent detection point cluster.

[0021] Preferably, the specific method for obtaining the characteristic value of the q-th initial adjacent detection point cluster at each historical detection time is as follows:

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

[0023] Three symbol parameters a1, a2, and a3 are preset, and a1 > a2 > a3; if the voltage difference of the q-th initial adjacent detection point cluster at the i-th historical detection moment is greater than 0, a1 is taken as the characteristic value of the q-th initial adjacent detection point cluster at the i-th historical detection moment; if the voltage difference of the q-th initial adjacent detection point cluster at the i-th historical detection moment is equal to 0, a2 is taken as the characteristic value of the q-th initial adjacent detection point cluster at the i-th historical detection moment; if the voltage difference of the q-th initial adjacent detection point cluster at the i-th historical detection moment is less than 0, a3 is taken as the characteristic value of the q-th 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 according to the cable body damage and electrical damage authenticity in the initial adjacent detection point cluster is as follows:

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

[0026] Preferably, the specific method for obtaining the transfer electrical damage interference between any two initial adjacent detection point clusters according to the true electrical damage of the cable body in other initial adjacent detection point clusters between the two initial adjacent detection point clusters is as follows:

[0027] All initial adjacent detection point clusters between the q-th initial adjacent detection point cluster and the p-th initial adjacent detection point cluster are denoted as influencing initial adjacent detection point clusters;

[0028] The ratio of the true electrical damage of the cable body of the k-th influencing initial adjacent detection point cluster to the number of all influencing initial adjacent detection point clusters is denoted as the transfer influence factor of the k-th influencing initial adjacent detection point cluster; the sum of the true electrical damage of the cable body between the q-th initial adjacent detection point cluster and the p-th initial adjacent detection point cluster is denoted as the first sum value; the ratio of the cumulative sum of the transfer influence factors of all influencing initial adjacent detection point clusters to the first sum value is taken as the transfer electrical damage interference between the q-th initial adjacent detection point cluster and the p-th initial adjacent detection point cluster.

[0029] Preferably, the specific method for obtaining the similarity correction distance between any two initial adjacent detection point clusters according to the transfer electrical damage interference between the two initial adjacent detection point clusters and the difference in the cable body damage is as follows:

[0030] Denote the inverse proportional normalization value of the transmitted electrical damage interference between the q-th initial adjacent detection point cluster and the p-th initial adjacent detection point cluster as the first distance factor; denote the absolute value of the difference between the cable body damage within the q-th initial adjacent detection point cluster and the cable body damage within the p-th initial adjacent detection point cluster as the second distance factor; take the product of the first distance factor and the second distance factor as the similarity correction distance between the q-th initial adjacent detection point cluster and the p-th initial adjacent detection point cluster.

[0031] Preferably, the specific method for merging all the initial adjacent detection point clusters based on the similarity correction distance to obtain the damage area on the metal cable body of the vehicle is as follows:

[0032] Preset a merging parameter E, make any pairwise combinations of all the initial adjacent detection point clusters to obtain several detection point cluster combinations; among all the detection point cluster combinations, denote the detection point cluster combination with the smallest similarity correction distance between two initial adjacent detection point clusters in the detection point cluster combination as the detection point cluster combination to be merged; merge all the detection points in the detection point cluster combination to be merged to obtain the detection point cluster after the first merge; denote the similarity correction distance between two initial adjacent detection point clusters in the detection point cluster combination to be merged as the merging factor of the detection point cluster after the first merge.

[0033] Obtain the similarity correction distance between the detection point cluster after the first merge and all other initial adjacent detection point clusters, denote the initial adjacent detection point cluster with the smallest similarity correction 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 merge to obtain the detection point cluster after the second merge; denote the similarity correction distance between the detection point cluster to be merged and the detection point cluster after the first merge as the merging factor of the detection point cluster after the second merge.

[0034] And so on, until the ratio of the merging factor between the detection point cluster after the latest merge and the detection point cluster after the previous merge is greater than or equal to the merging parameter E, then stop the merging; take the area composed of all the detection points in the detection point cluster after the latest merge as the damage area on the metal cable body of the vehicle.

[0035] The present invention also proposes a vehicle cable body damage detection system, including a memory and a processor, and the processor executes the computer program stored in the memory to implement the steps of the above-mentioned vehicle cable body damage detection method.

[0036] The beneficial effects of the technical solution of the present invention are as follows: According to the cable body damage and electrical damage authenticity within the initial adjacent detection point clusters, the true electrical damage of the cable body within each initial adjacent detection point cluster is obtained; according to the true electrical damage of the cable bodies of other initial adjacent detection point clusters between any two initial adjacent detection point clusters, the transfer electrical damage interference between any two initial adjacent detection point clusters is obtained; according to the transfer electrical damage interference between any two initial adjacent detection point clusters and the difference in the cable body damage, the similarity correction distance between any two initial adjacent detection point clusters is obtained; based on the similarity correction distance, all the initial adjacent detection point clusters are merged to obtain the damage area on the metal cable body of the vehicle; in this way, the influence of electrical interference transmitted to other detection points through current distribution can be more effectively eliminated, thereby improving the accuracy of the detection result of the cable body damage of the vehicle cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

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

[0039] Figure 2 It is a flowchart of the characteristic relationship of a method for detecting damage to the cable body of a vehicle cable according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will, in conjunction with the drawings and preferred embodiments, describe in detail the specific implementation manners, structures, characteristics and effects of a method and system for detecting damage to the cable body of a vehicle cable according to the present invention. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs.

[0042] The following will specifically describe the specific solutions of a method and system for detecting damage to the cable body of a vehicle cable provided by the present invention in conjunction with the drawings.

[0043] Please refer to Figure 1, which shows a step flow chart of a method for detecting damage to the cable body of an automotive cable provided by an embodiment of the present invention. The method includes the following steps:

[0044] Step S001: Obtain a voltage data sequence of a plurality of detection points on the metal cable body of the vehicle.

[0045] In a specific implementation manner of the embodiment of the present invention, the specific method for collecting the voltage data sequence of a plurality of detection points on the metal cable body of the vehicle is as follows:

[0046] Preset a detection parameter N. In this embodiment, N = 50 is used as an example for description, and this embodiment does not make specific limitations, where N is determined according to specific implementation circumstances;

[0047] On the metal cable body of the vehicle, evenly divide N detection points and arrange voltage sensors at each detection point;

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

[0049] Thus, a voltage data sequence of a plurality of detection points on the metal cable body of the vehicle is obtained through the above method.

[0050] Step S002: According to the distribution of the detection points on the metal cable body of the vehicle, divide all the detection points into several initial adjacent detection point clusters; according to the difference in the voltage data at the last detection moment between the voltage data sequences of two detection points in each initial adjacent detection point cluster, obtain the cable body damage of each initial adjacent detection point cluster; according to the difference in the voltage data at different detection moments between the voltage data sequences of two detection points in each initial adjacent detection point cluster, obtain the authenticity of electrical damage in each initial adjacent detection point cluster; according to the cable body damage and the authenticity of electrical damage in the initial adjacent detection point cluster, obtain the true electrical damage of the cable body in each initial adjacent detection point cluster.

[0051] It should be noted that for the metal cable in the automotive cable, the resistance detection method is usually used to detect the damage of 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. According to Ohm's law, the resistance value of the cable is calculated, 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 the adjacent area through the change of current distribution, and this influence will be transmitted to other detection points, resulting in misjudgment of the damage at other detection points; therefore, it is necessary to obtain the damage of the cable body within each initial adjacent detection point cluster.

[0052] Preferably, in some implementation manners of the embodiments of the present invention, the specific method for dividing all detection points into several initial adjacent detection point clusters according to the distribution of detection points on the metal cable body of the vehicle is as follows:

[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 implementation manners of the embodiments of the present invention, the specific method for obtaining the damage of the cable body within each initial adjacent detection point cluster according to the difference in the voltage data at the last detection moment between the voltage data sequences of the two detection points in each initial adjacent detection point cluster is as follows:

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

[0056] The ratio of the distance between the two detection points in the q-th initial adjacent detection point cluster to the cross-sectional area of the metal cable body is denoted 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 denoted as the non-damaged resistance within the q-th initial adjacent detection point cluster; the absolute value of the difference between the resistance at the current moment of the q-th initial adjacent detection point cluster and the non-damaged resistance within the q-th initial adjacent detection point cluster is used as the damage of the cable body within the q-th initial adjacent detection point cluster;

[0057] The specific formula is:

[0058]

[0059] In the formula, W q represents the cable body damage in the q-th initial adjacent detection point cluster; U1 q represents the voltage data at the last detection moment in the voltage data sequence of the first detection point in the q-th initial adjacent detection point cluster; U2 q represents the voltage data at the last detection moment in the voltage data sequence of the second detection point in the q-th initial adjacent detection point cluster; I represents the constant current value injected during the resistance method detection; ρ represents the resistivity of the metal cable body; L q represents the distance between the two detection points in the q-th initial adjacent detection point cluster; S represents the cross-sectional area of the metal cable body; || represents taking 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 the largest 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 gradually decreasing voltage data, that is, the voltage gradually decreases in the metal cable body. Therefore, for each initial adjacent detection point cluster, the voltage data sequence of its detection points should conform to the characteristic of voltage drop. Since the damage of voltage data will have a continuous impact in time series, the historical true and credible data will affect the true and credible of the current damage detection. That is, the farther the historical data is from the current detection moment, the smaller the influence value it provides.

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

[0062] Preset three symbol parameters a1, a2, a3, and a1 > a2 > a3. In this embodiment, a1 = 1, a2 = 0, and a3 = -1 are taken as examples for description, 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 between the voltage data at the i-th historical detection moment in the voltage data sequence between the first detection point and the second detection point in the q-th initial adjacent detection point cluster is recorded as the voltage difference at the i-th historical detection moment in the q-th initial adjacent detection point cluster;

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

[0066] Take the reciprocal of the time interval between the i-th historical detection moment and the last detection moment as the influence weight factor of the i-th historical detection moment; Denote 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 as the true electrical damage factor of the q-th initial adjacent detection point cluster at the i-th historical detection moment;

[0067] Take the sum of the true electrical damage factors of the q-th initial adjacent detection point cluster at all historical detection moments as the authenticity of electrical damage within the q-th initial adjacent detection point cluster;

[0068] The specific formula is:

[0069]

[0070] In the formula, Y q represents the authenticity of electrical damage within the q-th initial adjacent detection point cluster; M represents the number of all historical detection moments in the voltage data sequence of the detection points; U1 q,i 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; U2 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 since the physical damages such as wear and cracks of the metal cable body are usually local and will not be directly transmitted to other initial adjacent detection point clusters, while the electrical damage may affect the voltage in the adjacent area through the change of current distribution, and this influence will be transmitted to different initial adjacent detection point clusters, so it is necessary to determine the true electrical damage of the cable body within each initial adjacent detection point cluster.

[0072] Preferably, in some implementation manners of the embodiments of the present invention, since electrical interference changes the current distribution, resistance, load, and system impedance, for example, electrical interference can cause resonance or transient phenomena in the system, and this phenomenon is particularly obvious when abnormal interactions occur between electrical components. Resonance may cause a sharp increase in current within certain frequency ranges, which in turn leads to significant changes in voltage drops. Therefore, when judging the electrical damage of the metal cable body, it is necessary to obtain the true damage of the metal cable body based on the cable body damage and electrical damage authenticity within the initial adjacent detection point cluster. The specific method for obtaining the true electrical damage of the cable body in each initial adjacent detection point cluster according to the cable body damage and electrical damage authenticity within the initial adjacent detection point cluster is as follows:

[0073] Denote the normalized value of the difference in voltage data at the last detection moment between the voltage data sequences of two detection points in the q-th initial adjacent detection point cluster as the voltage drop factor; take the product of the voltage drop factor, the electrical damage authenticity within the q-th initial adjacent detection point cluster, and the cable body damage within the q-th initial adjacent detection point cluster as the true electrical damage of the cable body within the q-th initial adjacent detection point cluster;

[0074] The specific formula is:

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

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

[0077] Thus, 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 transfer electrical damage interference between any two initial adjacent detection point clusters according to the true 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 according to the transfer electrical damage interference between any two initial adjacent detection point clusters and the difference in the cable body damage of the stay cables.

[0079] It should be noted that since electrical damage will affect the voltage in the adjacent area by changing the current distribution, and then affect other initial adjacent detection point clusters; therefore, when analyzing any two initial adjacent detection point clusters, it is necessary to judge 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 small, and there is a cluster with a large electrical damage between them, these two initial adjacent detection point clusters will be electrically interfered by the initial adjacent detection point cluster with a large damage in the middle, which also shows that although the electrical damage of the two initial adjacent detection point clusters themselves is small, due to the large damage of the middle initial adjacent detection point cluster, it may be transmitted through the changes in voltage and current, resulting in the electrical performance of these two initial adjacent detection point clusters being affected.

[0080] Preferably, in some implementation manners of the embodiments of the present invention, the specific method for obtaining the transfer electrical damage interference between any two initial adjacent detection point clusters according to the true electrical damage of the cable body of other initial adjacent detection point clusters between any two initial adjacent detection point clusters is as follows:

[0081] All initial adjacent detection point clusters between the q-th initial adjacent detection point cluster and the p-th initial adjacent detection point cluster are denoted as influencing initial adjacent detection point clusters;

[0082] The ratio of the true electrical damage of the cable body of the k-th influencing initial adjacent detection point cluster to the number of all influencing initial adjacent detection point clusters is denoted as the transfer influence factor of the k-th influencing initial adjacent detection point cluster; the sum of the true electrical damage of the cable body between the q-th initial adjacent detection point cluster and the p-th initial adjacent detection point cluster is denoted as the first sum value; the ratio of the cumulative sum of the transfer influence factors of all influencing initial adjacent detection point clusters to the first sum value is used as the transfer electrical damage interference between the q-th initial adjacent detection point cluster and the p-th initial adjacent detection point cluster;

[0083] The specific formula is:

[0084]

[0085] In the formula, C q,p represents the transfer electrical damage interference between the q-th initial adjacent detection point cluster and the p-th initial adjacent detection point cluster; WD qDenote the true electrical damage of the cable body within the q-th initial adjacent detection point cluster; WD p Denote the true electrical damage of the cable body within the p-th initial adjacent detection point cluster; M q,p Denote the number of all initial adjacent detection point clusters between the q-th initial adjacent detection point cluster and the p-th initial adjacent detection point cluster; WD q,p,k Denote the true electrical damage of the cable body of the k-th initial adjacent detection point cluster between the q-th initial adjacent detection point cluster and the p-th initial adjacent detection point cluster.

[0086] It should be noted that in this embodiment, by clustering the regions with similar damage characteristics, the damaged regions can be automatically identified; during this clustering process, the greater the difference in damage between the initial adjacent monitoring point clusters, the greater the distance between them should be accordingly, in order to accurately reflect the damage degree 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 distributions, so electrical damage may cause the distance between two initial adjacent monitoring point clusters to be artificially changed, resulting in inaccurate distance calculation; to overcome this problem, this step adjusts appropriately to narrow the distance between the initial adjacent monitoring point clusters affected by electrical damage interference, ensuring the accuracy of the clustering process.

[0087] Preferably, in some implementation manners of the embodiments of the present invention, when the difference in damage between any two initial adjacent monitoring point clusters is large, it may be due to the interference of electrical damage, so the actual physical distance between these two clusters may not need to be so far apart. Therefore, when calculating the distance between clusters, the influence of electrical damage is considered, and thus the distance between these two initial adjacent monitoring point clusters needs to be corrected and narrowed to more truly reflect the similarity between the damaged regions; then, according to the transmitted electrical damage interference between any two initial adjacent detection point clusters and the difference in the damage of the cable body of the stay cable, the specific method for obtaining the similarity correction distance between any two initial adjacent detection point clusters is as follows:

[0088] Denote the inverse proportional normalization value of the transmitted electrical damage interference between the q-th initial adjacent detection point cluster and the p-th initial adjacent detection point cluster as the first distance factor; denote the absolute value of the difference between the damage of the cable body of the stay cable within the q-th initial adjacent detection point cluster and the damage of the cable body of the stay cable within the p-th initial adjacent detection point cluster as the second distance factor; take the product of the first distance factor and the second distance factor as the similarity correction distance between the q-th initial adjacent detection point cluster and the p-th 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 q-th initial adjacent detection point cluster and the p-th initial adjacent detection point cluster; C q,p represents the transfer electrical damage interference between the q-th initial adjacent detection point cluster and the p-th initial adjacent detection point cluster; W q represents the cable body damage within the q-th initial adjacent detection point cluster; W p represents the cable body damage within the p-th initial adjacent detection point cluster; || represents taking the absolute value; exp() represents the exponential function with the natural constant as the base. In the embodiment, the exp(-x) model is used to present the inverse proportional relationship and normalization process. x is the input of the model, and the implementer can select the inverse proportional function and normalization function according to the actual situation.

[0092] Thus, the similarity correction distance between any two initial adjacent detection point clusters is obtained through the above method.

[0093] Step S004: Based on the similarity correction distance, all initial adjacent detection point clusters are merged to obtain the damage area on the metal cable body of the vehicle.

[0094] Preferably, in some implementation manners of the embodiment of the present invention, the specific method for merging all initial adjacent detection point clusters based on the similarity correction distance to obtain the damage area on the metal cable body of the vehicle is as follows:

[0095] A merging parameter E is preset. In this embodiment, E = 1.05 is taken as an example for description. This embodiment does not make specific limitations, and E is determined according to the specific implementation situation;

[0096] All initial adjacent detection point clusters are combined in any pairwise manner 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 denoted as the detection point cluster combination to be merged; all detections in the detection point cluster combination to be merged are combined to obtain the detection point cluster after the first merge; the similarity correction distance between two initial adjacent detection point clusters in the detection point cluster combination to be merged is denoted as the merging factor of the detection point cluster after the first merge;

[0097] Obtain the similarity correction distance between the detected point cluster after the first merger and all other initial adjacent detected point clusters. Denote the initial adjacent detected point cluster with the minimum similarity correction distance as the detected point cluster to be merged. Merge the detected points in the detected point cluster to be merged with the detected points in the detected point cluster after the first merger to obtain the detected point cluster after the second merger. Denote the similarity correction distance between the detected point cluster to be merged and the detected point cluster after the first merger as the merger factor of the detected point cluster after the second merger.

[0098] Obtain the similarity correction distance between the detected point cluster after the second merger and all other initial adjacent detected point clusters. Denote the initial adjacent detected point cluster with the minimum similarity correction distance as the detected point cluster to be merged. Merge the detected points in the detected point cluster to be merged with the detected points in the detected point cluster after the second merger to obtain the detected point cluster after the third merger. Denote the similarity correction distance between the detected point cluster to be merged and the detected point cluster after the second merger as the merger factor of the detected point cluster after the third merger.

[0099] And so on, until the ratio of the merger factor between the detected point cluster after the latest merger and the detected point cluster after the previous merger is greater than or equal to the merger parameter E, then stop the merger. Take the area composed of all detected points in the detected point cluster after the latest merger as the damaged area on the metal cable body of the vehicle.

[0100] Transmit the damaged area on the metal cable body of the vehicle to the system, and trigger an alarm to help the maintenance personnel locate it quickly.

[0101] Through the above steps, a method for detecting damage to the cable body of an automobile cable is completed.

[0102] Please refer to Figure 2 , which shows a characteristic relationship flowchart of a method for detecting damage to the cable body of an automobile cable.

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

[0104] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present invention shall be included within the protection scope 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 of several detection points on the metal cable body of the automobile; According to 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; according to 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; according to 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; according to 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; According to the real electrical damage of the cable body of other initial adjacent detection point clusters between any two initial adjacent detection point clusters, the transmission electrical damage interference between any two initial adjacent detection point clusters is obtained; according to the transmission electrical damage interference between any two initial adjacent detection point clusters and the difference in the cable body damage of the cable, the similarity correction distance between any two initial adjacent detection point clusters is obtained; 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 automobile.

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 detection point distribution on the metal cable body of the automobile is: Take two adjacent detection points as an initial adjacent monitoring point cluster.

3. A method for detecting damage to a car cable according to claim 1, characterized in that: The specific method for obtaining the damage of the cable body in each initial adjacent detection point cluster according to 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 in the qth initial adjacent detection point cluster; the absolute value of the difference between the current resistance of the qth initial adjacent detection point cluster and the lossless resistance in the qth initial adjacent detection point cluster is taken as the damage of the cable body in the qth initial adjacent detection point cluster.

4. A method for detecting damage to a car cable according to claim 1, characterized in that: The specific method for obtaining the authenticity of electrical damage in each initial adjacent detection point cluster according to 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 inverse 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 time and the influence weight factor at the i-th historical detection time is recorded as the electrical damage real factor of the qth initial adjacent detection point cluster at the i-th historical detection time; 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. A method for detecting damage to a car 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 time 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 time; Preset three symbolic parameters a1, a2, a3, 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 ith historical detection time is less than 0, a3 is used as the characteristic value of the qth initial adjacent detection point cluster at the ith historical detection time.

6. A method for detecting damage to a car cable according to claim 1, characterized in that: The specific method for obtaining the real electrical damage of the cable body in each initial adjacent detection point cluster according to the damage of the cable body and the authenticity of electrical damage in the initial adjacent detection point cluster is: The normalized value of the difference between the voltage data sequences of two detection points in the qth initial adjacent detection point cluster at the last detection moment 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 a car 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 according to 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 real 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 is recorded as the transmission influence factor that affects the kth initial adjacent detection point cluster; the sum of the real 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 taken as the transmission 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 a car 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 according to 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 a car cable according to claim 1, characterized in that: The specific method of merging 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 is: A merging parameter E is preset, and 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; 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 merge is recorded as the merging factor of the detection point cluster after the second merge; And so on, until the ratio of the merging factor between the latest merged detection point cluster and the last merged detection point cluster is greater than or equal to the merging parameter E, the merging is stopped; the area formed by all the detection points in the latest merged detection point cluster is taken 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 a method for detecting damage to a cable body of an automobile cable as described in any one of claims 1 to 9 are implemented.

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