Vehicle three-phase line shielding layer detection system and detection method

Abstract

The invention provides a vehicle three-phase line shielding layer detection system and method, and the system comprises a current clamp which is clamped at a detection point position disposed on a to-be-detected cable shielding layer of a to-be-detected vehicle, collects an electromagnetic signal of the detection point, and transmits the electromagnetic signal to a spectrum analyzer, the detection point is located at the port connection part of the to-be-detected cable and the motor or the to-be-detected cable and the motor controller; the spectrum analyzer is used for receiving the electromagnetic signal from the current clamp, converting the electromagnetic signal into signal frequency domain data and transmitting the signal frequency domain data to the upper computer; and the upper computer is used for receiving the signal frequency domain data corresponding to each detection point from the spectrum analyzer, comparing the signal frequency domain data of each detection point with standard data, and determining the connection condition of the shielding layer at the port position corresponding to the detection point according to the comparison result of the signal frequency domain data of each detection point. According to the invention, the positioning efficiency and accuracy of the three-phase line shielding layer fault of the vehicle motor are improved.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicles, and in particular to a vehicle three-phase line shielding layer detection system and detection method. Background Art

[0002] Currently, during vehicle assembly, if there is a connection fault in one or more ports of the shielding layer of the three-phase line connecting the motor controller and the motor, it may cause electromagnetic interference to the vehicle's low-voltage components or the CAN bus.

[0003] When a fault occurs, the solution of the prior art is as follows: taking a motor controller connected to a motor as an example, three cables are connected between the motor controller and the motor. When detecting the shielding layer port of each cable connected to the motor controller, it is necessary to remove the end of the cable connected to the motor, and use a multimeter to detect the resistance value between the cable shielding layer and the frame. Similarly, when detecting the signal at the connection end of the cable and the motor, it is necessary to remove the end of the cable connected to the motor controller for detection. At the same time, it must be ensured that the vehicle is in a power-off state. When detecting the grounding of the shielding layer at one end of the cable, the other end of the cable needs to be disassembled and reassembled. The accuracy of the reassembly cannot be guaranteed. The current solution is inefficient and the effect is not ideal. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a vehicle three-phase line shielding layer detection system and detection method to overcome at least one of the above-mentioned defects.

[0005] In a first aspect, an embodiment of the present application provides a vehicle three-phase line shielding layer detection system, the system comprising: a current clamp, used to clamp at a detection point position set on the shielding layer of a cable to be tested of the vehicle to be tested, collect the electromagnetic signal of the detection point, and transmit the electromagnetic signal to a spectrum analyzer, the cable to be tested is set between a motor controller and a motor, and the detection point is located at a port connection between the cable to be tested and the motor or between the cable to be tested and the motor controller; a spectrum analyzer, used to receive the electromagnetic signal from the current clamp, convert the electromagnetic signal into signal frequency domain data, and transmit the signal frequency domain data to a host computer; a host computer, used to receive the signal frequency domain data corresponding to each detection point from the spectrum analyzer, and respectively compare the signal frequency domain data of each detection point with the standard data, and determine the connection status of the shielding layer at the port position corresponding to the detection point according to the comparison result of the signal frequency domain data of each detection point.

[0006] In an optional embodiment of the present application, the detection system also includes: an attenuator, wherein one end of the attenuator is connected to the output end of the current clamp, and the other end of the attenuator is connected to the spectrum analyzer, for receiving an electromagnetic signal from the current clamp, and after attenuating the electromagnetic signal, sending the attenuated electromagnetic signal to the spectrum analyzer.

[0007] In an optional embodiment of the present application, the host computer is configured to: receive signal frequency domain data of all detection points; for each detection point, determine whether the signal frequency domain data of the detection point is greater than the standard data; for each detection point, if the signal frequency domain data of the detection point is greater than the standard data, then determine that the connection condition of the shielding layer at the port position corresponding to the detection point is a connection failure, and record the position of the detection point; for each detection point, if the signal frequency domain data of the detection point is not greater than the standard data, then determine that the connection condition of the shielding layer at the port position corresponding to the detection point is a good connection, and continue to detect the next detection point.

[0008] In an optional embodiment of the present application, the host computer is further configured to: determine whether the electromagnetic signals of all detection points have been detected; if the electromagnetic signals of all detection points have been detected, determine that the detection of the shielding layer of the detection point is completed; if there are still detection points whose electromagnetic signals have not been detected, determine the detection points that have not been detected, and continue detection based on the electromagnetic signals of the undetected detection points.

[0009] In an optional embodiment of the present application, the host computer is also configured to: after the shielding layer detection at the detection point is completed, the vehicle to be tested is powered off, the shielding layer connection fault position is disassembled and reassembled; the signal frequency domain data of the detection point set at the shielding layer connection fault position is received; for each detection point set at the shielding layer connection fault position, determine whether the signal frequency domain data of the detection point is greater than the standard data; for each detection point set at the shielding layer connection fault position, if the signal frequency domain data of the detection point is not greater than the standard data, the connection status of the shielding layer at the port position corresponding to the detection point is converted to a good connection; for each detection point, if the signal frequency domain data of the detection point is greater than the standard data, the shielding layer connection fault position is repeatedly disassembled and reassembled, and the signal frequency domain data of the detection point set at the shielding layer connection fault position is received again.

[0010] In an optional embodiment of the present application, the host computer is further configured to: determine whether the connection conditions of all the detection points set at the shielding layer connection fault locations are converted to good connections; if the connection conditions of all the detection points set at the shielding layer connection fault locations are converted to good connections, the rectification of the shielding layer connection fault locations is completed; if there are still detection points set at the shielding layer connection fault locations whose connection conditions have not been converted to good connections, determine the detection points whose connection conditions have not been converted to good connections, disassemble the shielding layer connection fault locations of the detection points and reassemble them, and receive the signal frequency domain data of the detection points whose connection conditions have not been converted to good connections again.

[0011] In an optional embodiment of the present application, the host computer is also configured to: determine whether there is standard data in the standard database, the standard data being data detected on a vehicle of the same model and the same vehicle configuration as the vehicle to be tested; if there is standard data in the standard database, compare the standard data with the signal frequency domain data to determine the connection status of the shielding layer at the port position corresponding to each detection point; if there is no standard data in the standard database, select a standard vehicle and use the data detected on the standard vehicle as the standard data, the standard vehicle being a vehicle with normal operating conditions and having passed the electromagnetic compatibility test certification.

[0012] In an optional embodiment of the present application, the host computer is further configured to: when the working mode of the standard vehicle is upper high voltage and the motor controller is in a normal working state, receive the electromagnetic signals detected one by one by the current clamp at the detection point positions set on the cable to be tested; determine whether the electromagnetic signals of all detection points have been detected; if the electromagnetic signals of all detection points have been detected, the measurement data collection of the standard vehicle is completed, and the measurement data is stored in the standard database; if there are still detection points whose electromagnetic signals have not been detected, determine the detection points that have not been detected, and continue to obtain the electromagnetic signals of the detection points that have not been detected.

[0013] In an optional embodiment of the present application, the system also includes: a coaxial cable and an Ethernet cable, wherein the current clamp clamps the cable to be tested, the output end of the current clamp is connected to one end of an attenuator via the coaxial cable, the other end of the attenuator is connected to a spectrum analyzer, and the output end of the spectrum analyzer is connected to a host computer via an Ethernet cable.

[0014] In the second aspect, an embodiment of the present application also provides a detection method, which is applied to a vehicle three-phase line shielding layer detection system, and the detection method includes: a current clamp is used to clamp at a detection point position set on the shielding layer of a cable to be tested of the vehicle to be tested, collect the electromagnetic signal of the detection point, and send the electromagnetic signal to a spectrum analyzer, the cable to be tested is set between the motor controller and the motor, and the detection point is located at the port connection between the cable to be tested and the motor or the cable to be tested and the motor controller; the spectrum analyzer is used to receive the electromagnetic signal from the current clamp, convert the electromagnetic signal into signal frequency domain data, and transmit the signal frequency domain data to a host computer; the host computer is used to receive the signal frequency domain data corresponding to each detection point from the spectrum analyzer, and compare the signal frequency domain data of each detection point with the standard data respectively, and determine the connection status of the shielding layer at the port position corresponding to the detection point according to the comparison result of the signal frequency domain data of each detection point.

[0015] The vehicle three-phase line shielding layer detection system and detection method provided in the embodiment of the present application, the vehicle three-phase line shielding layer detection system and detection method, the system includes: a current clamp, which is used to clamp at the detection point position set on the shielding layer of the cable to be tested of the vehicle to be tested, collect the electromagnetic signal of the detection point, and transmit the electromagnetic signal to the spectrum analyzer, the detection point is located at the port connection between the cable to be tested and the motor or the cable to be tested and the motor controller; the spectrum analyzer is used to receive the electromagnetic signal from the current clamp, convert the electromagnetic signal into signal frequency domain data, and transmit the signal frequency domain data to the host computer; the host computer is used to receive the signal frequency domain data corresponding to each detection point from the spectrum analyzer, and compare the signal frequency domain data of each detection point with the standard data respectively, and determine the connection status of the shielding layer at the port position corresponding to the detection point according to the comparison result of the signal frequency domain data of each detection point. Through this application, the positioning efficiency and accuracy of the fault of the shielding layer of the three-phase line of the vehicle motor are improved.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a vehicle three-phase line shielding layer detection system provided in an embodiment of the present application;

[0019] Figure 2 One of the flow charts of three-phase line shielding layer detection of the host computer provided in the embodiment of the present application;

[0020] Figure 3 The second flowchart of the three-phase line shielding layer detection of the host computer provided in the embodiment of the present application;

[0021] Figure 4 A flowchart of determining standard data of the host computer provided in the embodiment of the present application;

[0022] Figure 5 A flow chart of the detection method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, each other embodiment obtained by those skilled in the art without making creative work belongs to the scope of protection of the present application.

[0024] First, the application scenarios to which the present application is applicable are introduced. The present application can be applied in the field of new energy vehicle technology.

[0025] Research has found that once one or more ports of the three-phase wire shielding layer between the motor controller and the motor have a poor connection, it is impossible to locate which port or ports have poor shielding contact. A multimeter must be used to detect and confirm each port one by one, especially for dual motor controller / motor systems, where troubleshooting is more complicated.

[0026] The detection methods in the prior art have the following defects:

[0027] 1) When detecting the position of the cable port, the other end of the cable needs to be removed, but it is difficult to quantify after reinstallation to ensure that the shielding layer is well installed;

[0028] 2) Repeated disassembly can easily cause physical damage to the port shield connection;

[0029] 3) When checking each port with a multimeter, if there are multiple ports with poor shielding contact, the troubleshooting work will be extremely cumbersome;

[0030] 4) If there are multiple port shielding layers with poor contact, when reinstalling one of the port shielding layers, it is difficult to judge whether it is installed properly based on the vehicle status;

[0031] 5) Troubleshooting is only performed when electromagnetic interference occurs in the vehicle. It is impossible to find that the shielding layer has poor contact and has not caused a fault due to electromagnetic interference, which poses a safety hazard.

[0032] Based on this, the embodiment of the present application provides a vehicle three-phase line shielding layer detection system and detection method, the system includes: a current clamp, which is used to clamp at the detection point position set on the shielding layer of the cable to be tested of the vehicle to be tested, collect the electromagnetic signal of the detection point, and transmit the electromagnetic signal to the spectrum analyzer, the detection point is located at the port connection between the cable to be tested and the motor or the cable to be tested and the motor controller; the spectrum analyzer is used to receive the electromagnetic signal from the current clamp, convert the electromagnetic signal into signal frequency domain data, and transmit the signal frequency domain data to the host computer; the host computer is used to receive the signal frequency domain data corresponding to each detection point from the spectrum analyzer, and compare the signal frequency domain data of each detection point with the standard data respectively, and determine the connection status of the shielding layer at the port position corresponding to the detection point according to the comparison result of the signal frequency domain data of each detection point. Through this application, the positioning efficiency and accuracy of the shielding layer fault of the vehicle motor three-phase line are improved, and the personnel, production and maintenance costs caused by the poor connection problem of the shielding layer port are reduced.

[0033] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of the vehicle three-phase line shielding layer detection system provided in the embodiment of the present application. Figure 1 As shown in , the vehicle three-phase line shielding layer detection system provided in the embodiment of the present application includes: a current clamp 11, a spectrum analyzer 12 and a host computer 13.

[0034] First, the connection relationship is determined. The output end of the current clamp 11 is connected to the spectrum analyzer 12 , and the output end of the spectrum analyzer 12 is connected to the host computer 13 .

[0035] The current clamp 11 is used to clamp at the detection point position set on the shielding layer of the cable to be tested of the vehicle to be tested, collect the electromagnetic signal of the detection point, and send the electromagnetic signal to the spectrum analyzer. The cable to be tested is set between the motor controller and the motor, and the detection point is located at the port connection between the cable to be tested and the motor or the cable to be tested and the motor controller;

[0036] In an optional embodiment, the current clamp model is F-52, which is used for signal acquisition, and the impedance of the cable to be tested, that is, the coaxial cable, is 50Ω, which can be used for signal transmission.

[0037] Here, the current clamp 11 is used to clamp at the detection points set on the shielding layer of the cable to be tested of the vehicle to be tested. These detection points are usually located at the port connection between the cable to be tested and the motor or motor controller. The current clamp 11 can accurately collect the electromagnetic signals of these detection points and transmit them to subsequent equipment. In addition, the current clamp 11 can realize non-contact measurement and can perform measurement without disconnecting the circuit, thereby reducing system downtime caused by improper operation and improving detection efficiency.

[0038] A spectrum analyzer 12, for receiving electromagnetic signals from the current clamp, converting the electromagnetic signals into signal frequency domain data, and transmitting the signal frequency domain data to a host computer;

[0039] In an optional embodiment, the spectrum analyzer 12 is a PFH model, which is used for signal processing and wiring harness.

[0040] Here, the spectrum analyzer 12 receives the electromagnetic signal and converts it into signal frequency domain data. These signal frequency domain data can clearly show the spectrum characteristics of the electromagnetic signal, including the frequency distribution, intensity and other key information of the signal. Subsequently, the spectrum analyzer 12 transmits these signal frequency domain data to the host computer 13 for further analysis.

[0041] The host computer 13 is used to receive the signal frequency domain data corresponding to each detection point from the spectrum analyzer 12, and compare the signal frequency domain data of each detection point with the standard data respectively, and determine the connection status of the shielding layer at the port position corresponding to the detection point according to the comparison result of the signal frequency domain data of each detection point.

[0042] Here, the host computer 13 is responsible for receiving the signal frequency domain data corresponding to each detection point transmitted by the spectrum analyzer 12. Through the built-in intelligent comparison algorithm, the host computer 13 can compare these signal frequency domain data with the standard data, and determine the shielding layer connection status of the port position corresponding to the detection point according to the comparison result. In addition, the host computer 13 can also generate a detailed detection report, including spectrum images, data analysis results and maintenance suggestions, etc., to provide comprehensive diagnostic information for technicians.

[0043] This application is used to detect the shielding layer connection quality of the cable between the motor controller and the motor of a new energy commercial vehicle to ensure the stability and safety of the vehicle's power system. In the power system, it is used to detect the electromagnetic interference of high-voltage cables and equipment to prevent system failures caused by electromagnetic interference.

[0044] In summary, the system consisting of current clamp, spectrum analyzer and host computer is not only highly professional and accurate, but also has good flexibility and scalability, and can meet the needs of electromagnetic signal analysis and fault diagnosis in different fields and application scenarios.

[0045] Specifically, the detection system also includes an attenuator.

[0046] In an optional embodiment, the attenuator may be a 20 dB attenuator for protecting the handheld spectrum analyzer 12 .

[0047] Among them, one end of the attenuator is connected to the output end of the current clamp, and the other end of the attenuator is connected to the spectrum analyzer, which is used to receive the electromagnetic signal from the current clamp, attenuate the electromagnetic signal, and then send the attenuated electromagnetic signal to the spectrum analyzer.

[0048] Here, one end of the attenuator is closely connected to the output end of the current clamp, and the other end is connected to the spectrum analyzer. Its main function is to receive high-intensity electromagnetic signals from the current clamp and appropriately attenuate these signals to ensure that when the signal is transmitted to the spectrum analyzer, its power is within the safe range that the analyzer can withstand. This design not only protects the spectrum analyzer from damage, but also ensures accurate transmission and analysis of the signal.

[0049] By introducing the attenuator, the detection system can handle a wider range of electromagnetic signal strengths, thereby improving the dynamic range of the system. This enables the detection system to more accurately capture and analyze weak signals, as well as withstand the impact of strong signals without damaging the equipment. The use of the attenuator reduces the signal strength entering the spectrum analyzer, but does not change the spectral characteristics of the signal, which enables the spectrum analyzer to work under a lower noise background and improves the sensitivity of the system. In addition, the detection system supports electromagnetic signal analysis within a wide bandwidth. By adjusting the settings of the current clamp and the spectrum analyzer, accurate capture and analysis of signals in different frequency bands can be achieved to meet the needs of different application scenarios.

[0050] The host computer 13 can realize remote monitoring and management of multiple detection points through network connection, which enables technicians to obtain detection data in real time, perform remote fault diagnosis and early warning, and improve operation and maintenance efficiency and response speed.

[0051] In an optional embodiment, the detection system also includes: a coaxial cable and an Ethernet cable, wherein the current clamp 11 clamps the cable to be tested, the output end of the current clamp is connected to one end of the attenuator via the coaxial cable, the other end of the attenuator is connected to the spectrum analyzer 12, and the output end of the spectrum analyzer 12 is connected to the host computer 13 via the Ethernet cable.

[0052] Specifically, the host computer 13 is configured as follows:

[0053] See also Figure 2 , Figure 2 This is one of the flow charts of the three-phase line shielding layer detection of the host computer provided in the embodiment of the present application. Figure 2As shown in the figure, the vehicle three-phase line shielding layer detection system provided by the embodiment of the present application includes:

[0054] S101, receiving signal frequency domain data of all detection points.

[0055] Here, after the system is started, the electromagnetic signals from all detection points after attenuator processing are received through the spectrum analyzer 12 to ensure that the spectrum analyzer 12 is set correctly, including parameters such as frequency range, detection method, trajectory mode, etc., to accurately capture signal characteristics.

[0056] In this step, the position and number of detection points must be determined first. Preferably, the three-phase line of the motor is three cables connected one-to-one between the motor and the motor controller, namely U, V, and W cables. The number of detection points is the number of motors (n) × 3 × 2, that is, the two ends of the U, V, and W cables between each pair of motor controllers and motors. The detection point position is the connection between the shielding layer and the motor or the shielding layer and the motor controller port.

[0057] Set the frequency range of spectrum analyzer 12 to 150kHz~30MHz, the trace mode to average, the detection mode to root mean square, and the detection points are defined as U-phase cable motor controller end, U-phase cable motor end, V-phase cable motor controller end, V-phase cable motor end, W-phase cable motor controller end, and W-phase cable motor end.

[0058] S102: for each detection point, determine whether the signal frequency domain data of the detection point is greater than the standard data.

[0059] For example, the standard data may be a threshold value set based on historical data, theoretical calculations, or industry standards.

[0060] Compare the received frequency domain signal with the standard data, including key indicators such as signal strength and frequency distribution.

[0061] Install the current clamps on the cables at the detection points one by one and compare the data.

[0062] S103 . For each detection point, if the signal frequency domain data of the detection point is greater than the standard data, it is determined that the connection condition of the shielding layer at the port position corresponding to the detection point is a connection failure, and the detection point position is recorded.

[0063] Once an abnormal signal frequency domain data is detected (such as excessive intensity), the detection point is immediately marked as a potential fault point, and detailed information of the fault point is recorded, including vehicle information, detection point location, signal characteristics, etc., for subsequent analysis and processing.

[0064] If the test data is higher than the standard data, it is determined that the shielding layer at the corresponding position of the test point has a poor connection. If the vehicle is equipped with multiple groups of motor controllers or multiple motors, the above-mentioned sequential detection and data judgment are performed in the order of the groups.

[0065] S104 , for each detection point, if the signal frequency domain data of the detection point is not greater than the standard data, it is determined that the connection condition of the shielding layer at the port position corresponding to the detection point is good, and the next detection point is detected.

[0066] For the detection points with normal signals, record their status as "well connected" and detect the next detection point in turn until all detection points have been checked.

[0067] S105: Determine whether the electromagnetic signals of all detection points have been detected.

[0068] Here, during the detection process, the system should track the number of detected detection points in real time, and proceed to the next step when all the predetermined detection points have been detected.

[0069] S106: If the electromagnetic signals of all the detection points are detected, it is determined that the detection of the shielding layer of the detection point is completed.

[0070] After the electromagnetic signals of all detection points are detected, the system can generate a detection report summarizing the status of all detection points. The report should include detailed information of the fault point, a list of well-connected detection points, and possible repair suggestions. The detection report should be saved to a database or cloud storage for subsequent review and analysis.

[0071] S107: If there are still detection points whose electromagnetic signals have not been detected, determine the detection points that have not been detected, and continue detection based on the electromagnetic signals of the detection points that have not been detected.

[0072] Specifically, the host computer is also configured as follows:

[0073] See also Figure 3 , Figure 3 This is the second flow chart of the three-phase line shielding layer detection of the host computer provided in the embodiment of the present application. Figure 3 As shown in the figure, the vehicle three-phase line shielding layer detection system provided by the embodiment of the present application includes:

[0074] S201. After the shielding layer detection at the detection point is completed, the vehicle to be tested is powered off, the shielding layer is disassembled from the faulty connection position and reassembled.

[0075] In this step, before the vehicle is powered off, ensure that the vehicle is in a safe state to avoid risks such as electric shock or short circuit. During the disassembly process, record the disassembly steps and connection details in detail for subsequent reassembly. When reassembling, follow the steps and details in the disassembly record to ensure correct connections and reliable fastening.

[0076] Preferably, according to the connection status of the shielding layer of each detection point, after the shielding wires at the corresponding positions of all detection points that do not meet the requirements are rectified, these detection points are re-detected and determined again until all requirements are met.

[0077] S202, receiving signal frequency domain data of a detection point set at a location where the shielding layer is connected to a fault.

[0078] Here, a spectrum analyzer 12 is used to receive the signal frequency domain data of the detection point to ensure that the equipment is set correctly, including parameters such as frequency range, detection method, trajectory mode, etc., so as to accurately capture the signal characteristics.

[0079] S203 , for each detection point set at the shielding layer connection fault location, determine whether the signal frequency domain data of the detection point is greater than the standard data.

[0080] The received signal frequency domain data is compared with the standard data, including key indicators such as signal strength and frequency distribution. If the signal is abnormal (such as too high strength), it indicates that the connection may still be faulty.

[0081] S204 , for each detection point set at the shielding layer connection fault location, if the signal frequency domain data of the detection point is not greater than the standard data, converting the connection status of the shielding layer at the port position corresponding to the detection point to a good connection.

[0082] Update the database or recording system to mark the status of the detection point as "well connected". If the status of all detection points is updated to "well connected", proceed to the next step.

[0083] S205 , for each detection point, if the signal frequency domain data of the detection point is greater than the standard data, repeatedly dismantle the shielding layer connection fault position and reassemble it, and receive the signal frequency domain data of the detection point set at the shielding layer connection fault position again.

[0084] Before repeated disassembly and reassembly, check whether there are any problems in the previous disassembly and assembly process. If problems are found, they are corrected; if no problems are found, try different assembly methods or check whether the connecting parts are damaged, receive the signal frequency domain data again, and make comparative judgments.

[0085] Determine whether the connection conditions of all detection points set at the shield layer connection fault locations are converted to good connections;

[0086] Here, the system should track the status update of each detection point in real time, and proceed to the next step when the status of all detection points is updated to "good connection".

[0087] If the connection conditions of all the detection points set at the shielding layer connection fault locations are converted to good connections, the rectification of the shielding layer connection fault locations is completed.

[0088] Generate a rectification report that summarizes all steps, test results, and final status of the rectification process. The report should include a comparison before and after the rectification, possible causes of the problem, and solutions. Save the rectification report to a database or cloud storage for subsequent review and analysis.

[0089] If the connection condition of the detection point set at the shielding layer connection fault still has not been converted to a good connection, then determine that the connection condition has not been converted to a good connection detection point, disassemble the shielding layer connection fault position of the detection point and reassemble it, and receive the signal frequency domain data of the detection point whose connection condition has not been converted to a good connection again.

[0090] If there are still detection points set at the shielding layer connection fault location where the connection status has not been converted to "good connection", analyze the signal frequency domain data of the unconverted detection points to find possible causes of the fault, and repeat the disassembly, reassembly and detection process based on the analysis results and suggestions until the status of all detection points is updated to "good connection".

[0091] Through the above steps, the rectification process is not only more detailed and complete, but also able to more accurately locate and solve shielding layer connection faults, improve rectification efficiency and accuracy. At the same time, the generated rectification report also provides valuable data support for subsequent analysis and improvement.

[0092] Specifically, the host computer 13 is also configured as follows:

[0093] Determine whether standard data exists in the standard database.

[0094] The standard data refers to data detected on a vehicle of the same model and configuration as the vehicle to be tested.

[0095] Among them, use a suitable database access tool or interface to connect to the database that stores standard data, and query whether there is corresponding standard data in the database according to the model and vehicle configuration information of the vehicle to be tested. If there are multiple data sets of the same model and configuration in the database, further screening may be required, such as selecting the latest, most complete or verified data set, checking the integrity of the standard data, and ensuring that all necessary test point data are included. Verification can be performed by comparing the consistency of different data sets or referring to other reliable data sources.

[0096] If standard data exists in the standard database, the standard data is compared with the signal frequency domain data to determine the connection status of the shielding layer at the port position corresponding to each detection point.

[0097] The queried standard data is loaded into the memory or a temporary storage area for comparison with the signal frequency domain data of the vehicle to be tested. The signal frequency domain data of the vehicle to be tested is compared with the standard data at each detection point. A specific comparison algorithm or threshold can be used to determine whether the signal frequency domain data is abnormal, thereby determining the connection status of the shielding layer. The comparison result of each detection point is recorded, including good connection, connection failure or other states. If a connection failure is found, the specific location of the fault and the possible cause of the fault can be recorded.

[0098] If the standard data does not exist in the standard database, a standard vehicle is selected and the data detected on the standard vehicle is used as the standard data.

[0099] A standard vehicle is a vehicle that operates normally in all conditions and has passed electromagnetic compatibility testing and certification.

[0100] Preferably, a standard vehicle that meets the requirements is selected based on the model and vehicle configuration information of the vehicle to be tested. The standard vehicle should have undergone electromagnetic compatibility testing and certification, and all operating conditions should be normal.

[0101] Ensure that the standard vehicle is in the working mode required for the test, such as high voltage and the motor controller is in normal working condition, and prepare the equipment required for the test, such as current clamp, spectrum analyzer, attenuator, etc.

[0102] High voltage on a vehicle usually refers to the new energy vehicle (such as a pure electric vehicle or a hybrid vehicle) starting its high voltage system to provide power to the motor or other high energy consumption components.

[0103] Different vehicle models and configurations have different standard data. According to production requirements, the standard data of the same vehicle model and configuration are selected as a reference. If the standard database does not have its data, a standard vehicle (a vehicle that is completely normal in all operating conditions and has passed the electromagnetic compatibility test certification) is selected for standard data testing.

[0104] See also Figure 4 , Figure 4 This is a flow chart of determining standard data of the host computer provided in the embodiment of the present application. Figure 4 As shown in the figure, the vehicle three-phase line shielding layer detection system provided by the embodiment of the present application includes:

[0105] S301. When the working mode of the standard vehicle is upper high voltage and the motor controller is in a normal working state, electromagnetic signals detected one by one by the current clamp at the detection point positions set on the cable to be tested.

[0106] The vehicle operating mode is that the vehicle is high voltage and the motor controller IGBT is in normal working state.

[0107] Specifically, the frequency range of the spectrum analyzer 12 is set to 150kHz~30MHz, the trajectory mode is set to average, the detection method is set to root mean square, and the detection points are defined as U-phase cable motor controller end, U-phase cable motor end, V-phase cable motor controller end, V-phase cable motor end, W-phase cable motor controller end, and W-phase cable motor end, and the current clamp 11 is clamped on the cables at the detection points in turn for detection and data storage one by one.

[0108] If the vehicle is equipped with multiple groups of motor controllers and multiple motors, the above-mentioned sequential detection and data storage are performed in the order of the groups.

[0109] Ensure that the standard vehicle is already at high voltage and the motor controller is in normal working condition, and all systems are in normal working mode. Check the connection and calibration of equipment such as current clamps and spectrum analyzers to ensure the accuracy and reliability of the test equipment. Mark the predetermined test point positions on the cable to be tested to ensure that each test point is accurately clamped.

[0110] According to the predetermined order, the detection points are clamped one by one, and the electromagnetic signal is received by the spectrum analyzer 12. When receiving the electromagnetic signal, it is ensured that the setting of the spectrum analyzer 12 matches the detection requirements, including the frequency range, detection method, trajectory mode and other parameters, and the signal frequency domain data of each detection point is recorded, including the key information such as the signal strength and frequency distribution.

[0111] S302: Determine whether the electromagnetic signals of all detection points have been detected.

[0112] Record the number of test points that have been tested and compare the number of test points that have been tested with the total number of test points scheduled to ensure that no test points are missed.

[0113] S303: If the electromagnetic signals of all detection points are detected, the measurement data collection of the standard vehicle is completed, and the measurement data is stored in the standard database.

[0114] If the electromagnetic signals of all detection points are detected, the signal frequency domain data of all detection points are sorted, including removing abnormal data, smoothing, data normalization and other steps to ensure that the format of the sorted data matches the requirements of the standard database.

[0115] S304: If there are still detection points whose electromagnetic signals have not been detected, determine the detection points whose detection has not been completed, and continue to acquire the electromagnetic signals of the detection points whose detection has not been completed.

[0116] Through the above steps, it is possible to accurately determine whether there is standard data in the standard database, and obtain the standard data according to the actual situation.

[0117] The vehicle three-phase line shielding layer detection system and detection method provided in the embodiment of the present application include: a current clamp, which is used to clamp at the detection point position set on the shielding layer of the cable to be tested of the vehicle to be tested, collect the electromagnetic signal of the detection point, and transmit the electromagnetic signal to the spectrum analyzer, the detection point is located at the port connection between the cable to be tested and the motor or the cable to be tested and the motor controller; the spectrum analyzer is used to receive the electromagnetic signal from the current clamp, convert the electromagnetic signal into signal frequency domain data, and transmit the signal frequency domain data to the host computer; the host computer is used to receive the signal frequency domain data corresponding to each detection point from the spectrum analyzer, and compare the signal frequency domain data of each detection point with the standard data respectively, and determine the connection status of the shielding layer at the port position corresponding to the detection point according to the comparison result of the signal frequency domain data of each detection point. Through this application, the positioning efficiency and accuracy of the shielding layer fault of the vehicle motor three-phase line are improved, and the personnel, production and maintenance costs caused by the poor connection problem of the shielding layer port are reduced.

[0118] The vehicle three-phase line shielding layer detection system and detection method provided in the present application have the advantages of safety, efficiency and accuracy, improve the efficiency and accuracy of locating three-phase line shielding layer faults of new energy commercial vehicle motors, and reduce the personnel, production and maintenance costs caused by poor connection problems of the shielding layer ports.

[0119] This application can accurately locate ports with poor shielding layer connections; reduce the number of times the cable shielding layer is disassembled, and reduce the physical damage to the shielding layer caused by the number of disassembly times; accurately determine the effect of shielding layer rectification; and adjust the working mode of rectification after verifying electromagnetic interference problems to detection when the vehicle is offline, to ensure that the shielding layer connections of all three-phase lines of motors in vehicles leaving the factory are good.

[0120] The present application is a non-electrical contact detection method, which ensures the work safety of personnel under high-voltage working conditions of the vehicle. The present application is executed under the normal working state of the vehicle, which ensures the validity of the detection point data and reduces the impact of misjudgment caused by indirect judgment of the vehicle status. The present application can quantify the detection data and improve the accuracy of the detection.

[0121] Compared with traditional detection methods, the present application can directly locate the poorly connected parts of the shielding layer, thereby improving work efficiency and avoiding physical damage to the port connection caused by multiple disassembly of traditional methods. It can accurately determine the rectification effect after reconnecting the shielding layer, and can also be used for vehicle offline detection to ensure that the shielding layer connections of all three-phase motors in vehicles leaving the factory are in good condition.

[0122] Based on the same inventive concept, a detection method corresponding to the vehicle three-phase line shielding layer detection system is also provided in the embodiment of the present application. Since the principle of solving the problem by the method in the embodiment of the present application is similar to the above-mentioned vehicle three-phase line shielding layer detection system in the embodiment of the present application, the implementation of the method can refer to the implementation of the method, and the repeated parts will not be repeated.

[0123] See also Figure 5 , Figure 5 This is a flow chart of the detection method provided in the embodiment of the present application. Figure 5 As shown in, the detection method is applied to a vehicle three-phase line shielding layer detection system, comprising:

[0124] S401, a current clamp is used to clamp at a detection point position set on the shielding layer of a cable to be tested of the vehicle to be tested, collect an electromagnetic signal at the detection point, and send the electromagnetic signal to a spectrum analyzer, the cable to be tested is set between a motor controller and a motor, and the detection point is located at a port connection between the cable to be tested and the motor or between the cable to be tested and the motor controller;

[0125] S402, a spectrum analyzer is used to receive the electromagnetic signal from the current clamp, convert the electromagnetic signal into signal frequency domain data, and transmit the signal frequency domain data to a host computer;

[0126] S403, the host computer is used to receive the signal frequency domain data corresponding to each detection point from the spectrum analyzer, and compare the signal frequency domain data of each detection point with the standard data respectively, and determine the connection status of the shielding layer at the port position corresponding to the detection point according to the comparison result of the signal frequency domain data of each detection point.

[0127] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0128] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0129] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0130] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0131] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application can essentially be embodied in the form of a software product, or in other words, the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0132] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A vehicle three-phase line shielding layer detection system, characterized in that: include: A current clamp is used to clamp at a detection point position set on the shielding layer of the cable to be tested of the vehicle to be tested, collect electromagnetic signals at the detection point, and transmit the electromagnetic signals to a spectrum analyzer, the cable to be tested is set between the motor controller and the motor, and the detection point is located at the port connection between the cable to be tested and the motor or the cable to be tested and the motor controller; A spectrum analyzer, used for receiving the electromagnetic signal from the current clamp, converting the electromagnetic signal into signal frequency domain data, and transmitting the signal frequency domain data to a host computer; The host computer is used to receive the signal frequency domain data corresponding to each detection point from the spectrum analyzer, and compare the signal frequency domain data of each detection point with the standard data respectively, and determine the connection status of the shielding layer at the port position corresponding to the detection point according to the comparison result of the signal frequency domain data of each detection point.

2. The system according to claim 1, characterized in that The detection system further comprises: an attenuator, Among them, one end of the attenuator is connected to the output end of the current clamp, and the other end of the attenuator is connected to the spectrum analyzer, which is used to receive the electromagnetic signal from the current clamp, attenuate the electromagnetic signal, and then send the attenuated electromagnetic signal to the spectrum analyzer.

3. The system according to claim 1, characterized in that The host computer is configured as follows: Receive signal frequency domain data of all detection points; For each detection point, determine whether the signal frequency domain data of the detection point is greater than the standard data; For each detection point, if the signal frequency domain data of the detection point is greater than the standard data, the connection condition of the shielding layer at the port position corresponding to the detection point is determined to be a connection failure, and the position of the detection point is recorded; For each detection point, if the signal frequency domain data of the detection point is not greater than the standard data, it is determined that the connection condition of the shielding layer at the port position corresponding to the detection point is good, and the next detection point is detected.

4. The system according to claim 3, characterized in that The host computer is also configured as follows: Determine whether the electromagnetic signals of all detection points have been detected; If the electromagnetic signals of all the detection points are detected, it is determined that the detection of the shielding layer of the detection point is completed; If there are still detection points whose electromagnetic signals have not been completely detected, the detection points that have not been detected are determined, and detection is continued based on the electromagnetic signals of the detection points that have not been detected.

5. The system according to claim 4, characterized in that The host computer is also configured as follows: After the shield layer test at the test point is completed, the vehicle to be tested is powered off, the shield layer connection fault position is disassembled and reassembled; Receive signal frequency domain data of a detection point set at a faulty connection of the shielding layer; For each detection point set at the shielding layer connection fault location, determine whether the signal frequency domain data of the detection point is greater than the standard data; For each detection point set at the shielding layer connection fault location, if the signal frequency domain data of the detection point is not greater than the standard data, the connection status of the shielding layer at the port position corresponding to the detection point is converted to a good connection; For each detection point, if the signal frequency domain data of the detection point is greater than the standard data, the shielding layer connection fault position is repeatedly disassembled and reassembled, and the signal frequency domain data of the detection point set at the shielding layer connection fault position is received again.

6. The system according to claim 5, characterized in that The host computer is also configured as follows: Determine whether the connection conditions of all detection points set at the shield layer connection fault locations are converted to good connections; If the connection conditions of all the detection points set at the shielding layer connection fault locations are converted to good connections, the rectification of the shielding layer connection fault locations is completed; If the connection condition of the detection point set at the shielding layer connection fault still has not been converted to a good connection, then determine that the connection condition has not been converted to a good connection detection point, disassemble the shielding layer connection fault position of the detection point and reassemble it, and receive the signal frequency domain data of the detection point whose connection condition has not been converted to a good connection again.

7. The system according to claim 3, characterized in that The host computer is also configured as follows: Determine whether there is standard data in the standard database, where the standard data is data detected on a vehicle of the same model and configuration as the vehicle to be tested; If the standard database contains standard data, the standard data is compared with the signal frequency domain data to determine the connection status of the shielding layer at the port position corresponding to each detection point; If the standard database does not contain standard data, a standard vehicle is selected and the data detected on the standard vehicle is used as the standard data. The standard vehicle is a vehicle that is normal in all operating conditions and has passed the electromagnetic compatibility test certification.

8. The system according to claim 7, characterized in that The host computer is also configured as follows: When the working mode of the standard vehicle is high voltage and the motor controller is in a normal working state, receiving electromagnetic signals detected one by one by the current clamp at the detection point positions set on the cable to be tested; Determine whether the electromagnetic signals of all detection points have been detected; If the electromagnetic signals of all detection points are detected, the measurement data collection of the standard vehicle is completed, and the measurement data is stored in the standard database; If there are still detection points whose electromagnetic signals have not been completely detected, the detection points whose detection has not been completely completed are determined, and the electromagnetic signals of the detection points whose detection has not been completely completed are continuously acquired.

9. The system according to claim 2, characterized in that The system also includes: a coaxial cable and an Ethernet cable, The current clamp clamps the cable to be tested, the output end of the current clamp is connected to one end of the attenuator through a coaxial cable, the other end of the attenuator is connected to the spectrum analyzer, and the output end of the spectrum analyzer is connected to the host computer through an Ethernet cable.

10. A detection method, characterized in that: Applied to a vehicle three-phase line shielding layer detection system, the method comprises: The current clamp is used to clamp at the detection point position set on the shielding layer of the cable to be tested of the vehicle to be tested, collect the electromagnetic signal of the detection point, and send the electromagnetic signal to the spectrum analyzer, the cable to be tested is set between the motor controller and the motor, and the detection point is located at the port connection between the cable to be tested and the motor or the cable to be tested and the motor controller; The spectrum analyzer is used to receive the electromagnetic signal from the current clamp, convert the electromagnetic signal into signal frequency domain data, and transmit the signal frequency domain data to a host computer; The host computer is used to receive the signal frequency domain data corresponding to each detection point from the spectrum analyzer, and compare the signal frequency domain data of each detection point with the standard data respectively, and determine the connection status of the shielding layer at the port position corresponding to the detection point according to the comparison result of the signal frequency domain data of each detection point.

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