Capability verification system and method for low-frequency electromagnetic field emission intensity testing laboratories

Abstract

The present invention provides a capability verification system for a low-frequency electromagnetic field emission intensity detection laboratory, comprising: a sample vehicle arranged inside the detection laboratory; an interference generating device connected to the sample vehicle, used to generate a magnetic field signal inside the detection laboratory through the sample vehicle; a magnetic field detection device, used to obtain the magnetic field strength at a preset position in the detection laboratory; a magnetic field analysis device, used to analyze and process the magnetic field strength detected by the magnetic field detection device to determine the capability of the detection laboratory. A capability verification method for a low-frequency electromagnetic field emission intensity detection laboratory is also provided. The present invention improves and supplements the existing standard method, uses a standard sample vehicle as a transmitting source, and a loop antenna as a receiving source, and analyzes the magnetic field information generated by the sample vehicle in the detection laboratory to determine the capability of the detection laboratory. At the same time, the method has the advantages of convenience, speed, and simple operation.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic compatibility testing of electric vehicles, and in particular to a capability verification system and method for a low-frequency electromagnetic field emission intensity testing laboratory. Background Art

[0002] Laboratory proficiency verification is one of the important technical methods for assessing laboratory technical capabilities, an effective means of judging and monitoring laboratory capabilities, and a supplement to laboratory internal quality control technology. Through proficiency verification, the quality and capabilities of the laboratory's own testing work can be evaluated, the overall level of technical capabilities of reference laboratories and the differences between laboratories can be assessed, and the consistency of laboratory test results can be promoted. At the same time, possible problems in the laboratory's testing can be discovered and improvement methods and corrective measures can be proposed, thereby enhancing the laboratory's customers' trust in the test data issued by the laboratory. It has a positive and important significance for further improving the laboratory's quality management and improving its technical capabilities.

[0003] With the vigorous development of new energy vehicles, the vehicle's drive system, body, and chassis control system are all electronic, and the electromagnetic radiation generated by electric vehicles during operation needs to be more comprehensively measured. Compared with fuel vehicles, electric vehicles need to additionally measure the vehicle's electromagnetic field emission intensity in the frequency band of 150kHz to 30MHz. This test project is currently an important control project for the implementation of automotive product announcements and product certification by national competent departments such as the Ministry of Industry and Information Technology, the Ministry of Environmental Protection, and the National Certification and Accreditation Administration. Its testing and evaluation standard GB / T 18387-2017 stipulates the limit and measurement method of the electromagnetic field emission intensity of electric vehicles in the frequency band of 150kHz to 30MHz.

[0004] At present, the test of electromagnetic field emission intensity of electric vehicles in the frequency band of 150kHz to 30MHz is all carried out in electromagnetic compatibility darkrooms in China. Different suppliers' electromagnetic compatibility darkrooms use different solutions, which leads to different field characteristics of the darkrooms they build when testing the electromagnetic field emission intensity in the frequency band of 150kHz to 30MHz, thus affecting the test results. In addition, the measurement uncertainty introduced by the measurement systems of different laboratories also needs to be compared and verified. In order to improve the technical level of domestic automobile electromagnetic compatibility testing and carry out inter-laboratory comparison and capability verification activities in a standardized manner, the automobile industry has carried out two automobile radio disturbance characteristic detection capability verifications in 2016 and 2020, based on GB 14023-2011 and GB 34660-2017. However, these two standards only measure the electromagnetic field emission intensity of vehicles in the frequency band of 30MHz-2GHz, which has led to the fact that the comparison of electromagnetic field emission intensity in the frequency band of 150kHz to 30MHz has not yet been carried out. In order to carry out electromagnetic compatibility proficiency verification for electric vehicles more comprehensively, better implement the GB / T 18387-2017 "Limits and measurement methods of electromagnetic field emission intensity of electric vehicles" standard and unify test procedures, improve test quality and data accuracy and reproducibility, reduce (eliminate) the differences in test results between laboratories, improve the testing technology and management level of each reference laboratory, and promote exchanges and cooperation, it is necessary to propose a laboratory proficiency verification program based on low-frequency electromagnetic field emission intensity detection of electric vehicles.

[0005] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a capability verification system and method for a low-frequency electromagnetic field emission intensity testing laboratory, which determines the capability of the testing laboratory by analyzing and processing the magnetic field information generated by sample vehicles in the testing laboratory.

[0007] To achieve the above-mentioned purpose and other related purposes, the present invention provides a capability verification system for a low-frequency electromagnetic field emission intensity detection laboratory, the capability verification system comprising:

[0008] A sample vehicle disposed inside the testing laboratory;

[0009] an interference generating device, connected to the sample vehicle, and used to generate a magnetic field signal inside the testing laboratory through the sample vehicle;

[0010] A magnetic field detection device, used to obtain the magnetic field strength at a preset position in the detection laboratory;

[0011] The magnetic field analysis device is used to analyze and process the magnetic field strength detected by the magnetic field detection device to determine the capability of the detection laboratory.

[0012] Preferably, the interference generating device comprises:

[0013] A radio frequency generating device, used to generate a radio frequency interference signal in a predetermined frequency band;

[0014] The amplification and injection device is respectively connected to the RF generating device and the grounding wire of the sample vehicle, and is used to amplify the RF interference signal and inject the amplified RF interference signal into the grounding wire so that the sample vehicle generates a magnetic field signal of a predetermined frequency band.

[0015] Preferably, the magnetic field detection device comprises:

[0016] at least one antenna, disposed at a preset position of the sample vehicle, for acquiring a magnetic field signal emitted by the sample vehicle;

[0017] A receiver is connected to the at least one antenna and is used to determine the corresponding magnetic field strength according to the acquired magnetic field signal.

[0018] Preferably, the magnetic field analysis device comprises:

[0019] A comparison unit, used for analyzing and processing the magnetic field intensity obtained by the magnetic field detection device and the target magnetic field intensity;

[0020] The output unit is used to output the result of the comparison processing performed by the comparison unit.

[0021] Preferably, the target magnetic field strength includes: a standard magnetic field strength, and / or a magnetic field strength obtained by a designated testing laboratory.

[0022] Preferably, the magnetic field analysis device further comprises: a storage unit, configured to store the standard magnetic field strength information and / or the magnetic field strength information obtained by the designated testing laboratory.

[0023] Preferably, the magnetic field analysis device further includes a control unit connected to the magnetic field interference device, and configured to send a control instruction to the interference generating device so that the sample vehicle generates a magnetic field signal.

[0024] The present invention also provides a capability verification method for a low-frequency electromagnetic field emission intensity detection laboratory, the capability verification method comprising:

[0025] Controlling the sample vehicle to generate a magnetic field signal of a predetermined frequency band inside the testing laboratory;

[0026] Obtaining the magnetic field strength at a preset position of the sample vehicle;

[0027] The magnetic field strength is analyzed and processed to determine and / or output the capability of the testing laboratory.

[0028] Preferably, the step of controlling the sample vehicle to generate a magnetic field signal of a predetermined frequency band inside the testing laboratory comprises:

[0029] Controlling a radio frequency generating device to generate a radio frequency interference signal in a predetermined frequency band;

[0030] Amplifying the radio frequency interference signal and injecting it into the sample vehicle via a ground line;

[0031] The sample vehicle generates a magnetic field signal of the predetermined frequency band inside the testing laboratory based on the amplified radio frequency interference signal.

[0032] Preferably, the step of obtaining the magnetic field strength at a preset position of the sample vehicle includes:

[0033] Acquire a magnetic field signal at a preset position through an antenna;

[0034] The receiver determines the corresponding magnetic field strength according to the magnetic field signal.

[0035] Preferably, the step of analyzing and processing the magnetic field strength to determine the capability of the testing laboratory comprises:

[0036] Obtaining a difference between the magnetic field strength and a target magnetic field strength;

[0037] The difference is compared and analyzed with a preset magnetic field difference threshold.

[0038] Preferably, the target magnetic field strength includes a standard magnetic field strength and / or a magnetic field strength obtained by a designated testing laboratory.

[0039] Preferably, the analysis and processing results include:

[0040] If the difference is within the preset magnetic field difference threshold range, it is determined that the laboratory meets the experimental conditions; and / or,

[0041] If the difference is not within the preset magnetic field difference threshold range, it is determined that the laboratory does not meet the experimental conditions.

[0042] As described above, the capability verification system and method for a low-frequency electromagnetic field emission intensity testing laboratory provided by the present invention improves and supplements the existing standard method, uses a standard sample vehicle as a transmitting source, and a loop antenna as a receiving source, and analyzes and processes the magnetic field information generated by the sample vehicle in the testing laboratory to determine the capability of the testing laboratory. At the same time, the method has the advantages of convenience, simplicity of operation, and significant comparability. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of the capability verification system of the low-frequency electromagnetic field emission intensity detection laboratory of the present invention.

[0044] Figure 2 It is a schematic diagram of the structure of the capability verification system of multiple low-frequency electromagnetic field emission intensity detection laboratories of the present invention.

[0045] Figure 3 It is a schematic diagram of the structure of the interference generating device of the present invention.

[0046] Figure 4 It is a structural schematic diagram of the capability verification system of the low-frequency electromagnetic field emission intensity detection laboratory of the present invention.

[0047] Figure 5 It is a structural schematic diagram of the capability verification system of the low-frequency electromagnetic field emission intensity detection laboratory of the present invention.

[0048] Figure 6 It is a structural schematic diagram of the magnetic field analysis device of the present invention.

[0049] Figure 7 It is a schematic diagram of the effect of the capability verification system of the low-frequency electromagnetic field emission intensity detection laboratory of the present invention.

[0050] Figure 8 The present invention is a schematic flow chart of the capability verification method of a low-frequency electromagnetic field emission intensity detection laboratory.

[0051] Fig. 9 This is a schematic diagram of the process of controlling a sample vehicle to generate magnetic field interference in a predetermined frequency band according to the present invention.

[0052] Fig.10 A schematic diagram of the process of obtaining the magnetic field strength at a preset position of a sample vehicle according to the present invention.

[0053] Fig.11 The figure is a schematic diagram of the process of analyzing and processing the magnetic field strength in the present invention.

[0054] Fig.12 It is a schematic diagram of the magnetic field strength analysis results of the present invention.

[0055] Fig.13It is a schematic diagram of the magnetic field strength analysis results of the present invention. DETAILED DESCRIPTION

[0056] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0057] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context of the specific embodiment.

[0058] It should be understood that, although the terms first, second, third, etc. may be used to describe various information in this article, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this article, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination". Furthermore, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate that there are the described features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or", "and / or", "including at least one of the following" etc. used in this application can be interpreted as inclusive, or mean any one or any combination. For example, “comprising at least one of the following: A, B, C” means “any of the following: A; B; C; A and B; A and C; B and C; A and B and C”, and for another example, “A, B or C” or “A, B and / or C” means “any of the following: A; B; C; A and B; A and C; B and C; A and B and C”. An exception to this definition will only occur when a combination of elements, functions, steps or operations are inherently mutually exclusive in some manner.

[0059] It should be understood that, although the various steps in the flowchart in the embodiment of the present application are displayed in sequence according to the indication of the arrows, these steps are not necessarily performed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and it can be performed in other orders. Moreover, at least a portion of the steps in the figure may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and their execution order is not necessarily performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0060] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0061] It should be noted that in this article, step codes such as S301, S302, etc. are used for the purpose of expressing the corresponding content more clearly and concisely, and do not constitute a substantial limitation on the sequence. When implementing the step, those skilled in the art may execute S301 first and then S302, etc., but these should all be within the scope of protection of this application.

[0062] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0063] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present application, and have no specific meanings. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0064] See also Figure 1 As shown, the present invention provides a capability verification system for a low-frequency electromagnetic field emission intensity detection laboratory, and the capability verification system includes: a sample vehicle, an interference generating device, a magnetic field detecting device and a magnetic field analyzing device.

[0065] In an embodiment of the present application, when verifying the detection capabilities of different laboratories, in order to ensure the correctness and reproducibility of the verification results and reduce the differences in the detection results between laboratories, in the capability verification system of the present invention, an interference generating device for generating radio frequency signals is connected to a sample vehicle, and the entire sample vehicle is placed inside the laboratory to be verified as a standard magnetic field emission source. By injecting the radio frequency signal generated by the interference generating device into the sample vehicle, the sample vehicle can be used as an emission source to generate a magnetic field signal. The magnetic field strength information at a preset position of the sample vehicle is obtained by a magnetic field detection device, and the magnetic field strength information is sent to a magnetic field analysis device for analysis and processing, thereby obtaining the verification result of the current laboratory to be verified. In a preferred embodiment, when verifying multiple laboratories, the capability verification system of the present invention is used to complete the collection of magnetic field strength information of multiple laboratories one by one, and then the collected magnetic field strength information of multiple laboratories is analyzed and processed, thereby obtaining the verification result of the laboratory; in another preferred embodiment, the same sample vehicle and a magnetic field detection device are respectively set in each laboratory to be verified, with reference to Figure 2 As shown, during the verification process, the sample vehicles in each laboratory generate magnetic field signals respectively, and the magnetic field detection device in each laboratory sends the acquired magnetic field strength information to the magnetic field analysis device. The magnetic field analysis device completes the corresponding analysis and processing while receiving the magnetic field strength information. By collecting the magnetic field strength information in parallel and performing analysis and processing, the verification efficiency of the laboratory can be improved.

[0066] See also Figure 3 and Figure 7 As shown, the interference generating device includes: a radio frequency generating device and an amplifying and injecting device. The radio frequency interference signal generated by the radio frequency generating device is injected into the grounding wire of the sample vehicle after being amplified by the amplifying and injecting device. The sample vehicle generates a magnetic field signal based on the radio frequency interference information received from the grounding wire.

[0067] In one example, the capability verification system can be used for low-frequency electromagnetic field emission intensity testing laboratories. The low-frequency electromagnetic field specifically refers to an electromagnetic field with a frequency band of 150kHz~30MHz. Therefore, the sample vehicle is required to generate a magnetic field signal with a frequency band of 150kHz~30MHz. If the sample vehicle is to be controlled to generate a magnetic field signal with a frequency band of 150kHz~30MHz, the interference generating device needs to be able to generate radio frequency interference in the frequency band of 150kHz~30MHz. It can be understood that if a laboratory that can detect other frequency bands needs to be verified, the interference generating device needs to be able to generate radio frequency interference signals in other frequency bands.

[0068] In order to generate a radio frequency interference signal in the frequency band of 150kHz~30MHz, the above-mentioned radio frequency generating device can further select a conductive comb source with a frequency band of 150kHz~30MHz, and after amplification processing by an amplification injection device with a frequency band of 150kHz~30MHz, inject it into the grounding line of the sample vehicle, thereby controlling the sample vehicle to generate a magnetic field signal with a frequency band of 150kHz~30MHz. In a preferred embodiment, in order to facilitate accurate and rapid completion of laboratory capability verification, the interference generating device can generate radio frequency interference signals at multiple frequency points within 150kHz~30MHz, for example: radio frequency interference signals generated at 10 frequency points such as 0.3MHz, 0.5MHz, 0.8MHz, 1MHz, 5MHz, 10MHz, 15MHz, 20MHz, 25MHz, 30MHZ, etc. It should be noted that the above 10 frequency points are only exemplary descriptions and cannot be used as a limitation of the protection scope.

[0069] Similarly, when the interference generating device is required to generate radio frequency interference signals in other frequency bands, the radio frequency interference signals can also be generated at multiple frequency points within other frequency bands, which will not be elaborated here.

[0070] In other embodiments of the present invention, reference Figure 4 and Figure 7 As shown, the magnetic field detection device in all the above embodiments specifically includes: an antenna and a receiver. In this embodiment, the antenna can be placed at a preset position to obtain magnetic field information at the position, and the receiver determines the magnetic field strength at the position according to the obtained magnetic field information.

[0071] The receiver can be connected to the antenna to determine the corresponding magnetic field strength according to the magnetic field signal obtained by the antenna.

[0072] In one example, the antenna for acquiring magnetic field information may be a loop antenna. When detecting the magnetic field strength around a sample vehicle in a laboratory, in order to ensure that the magnetic field information received by the antenna is not affected by the ground, the following implementation method may be adopted:

[0073] When placing the antenna, keep the center of the loop antenna 1.3 meters from the ground, with an error of no more than 0.05 meters.

[0074] The specific preset positions mentioned above may be one or more. When there are multiple preset positions, the multiple preset positions may be located in different directions of the sample vehicle. The above different directions exemplarily include at least two directions of left, right, head, tail, etc., or exemplarily include at least two directions of left, right, head, tail, up, down, etc. Of course, those skilled in the art can also flexibly select directions as needed, for example, selecting directions with an angle of 45 degrees, 30 degrees, etc. with the center line of the front of the vehicle, which will not be elaborated here. At least one preset position can be set in the selected direction.

[0075] The number of the antennas can be one or more.

[0076] In an exemplary scenario, when obtaining the magnetic field strength information around the vehicle, if there is only one antenna and only the magnetic field strength information at a preset position needs to be obtained, then when placing the antenna, the antenna only needs to be placed at the preset position of the sample vehicle, for example, at a position three meters away from the center line of the front of the vehicle with an error of no more than 0.03 meters.

[0077] In another example scenario, when there is only one loop antenna and it is necessary to obtain the magnetic field strength information of multiple preset positions around the sample vehicle, in the process of obtaining the magnetic field strength, the loop antenna can be placed in each preset position around the sample vehicle in turn, for example, in the preset positions of the front, rear, and both sides of the vehicle body in turn to collect magnetic field information. Exemplarily, the preset position in the direction of the front of the vehicle can be selected to be located on the center line of the front of the vehicle, and the error is not more than 0.03 meters away from the front of the vehicle. The preset position in the direction of the rear of the vehicle can be selected to be located on the center line of the rear of the vehicle, and the error is not more than 0.03 meters away from the rear of the vehicle. The preset position on the left side of the vehicle body may include: on the left side of the sample vehicle, and located on the center line between the front and rear axles, the error is not more than 0.03 meters away from the left side of the vehicle. The preset position on the right side of the vehicle body is similar to it, and will not be repeated here.

[0078] In another example scenario, refer to Figure 5As shown, when there are multiple antennas, for example, four, the four antennas are placed at preset positions in the front, rear, and both sides of the vehicle body, so that when acquiring magnetic field information, the magnetic field strength information of multiple preset positions in the same frequency band magnetic field can be acquired simultaneously, thereby improving the efficiency of magnetic field information acquisition. The preset positions in the front, rear, and both sides of the vehicle body can be referred to the above introduction and will not be repeated here.

[0079] As mentioned above, the interference generating device can generate radio frequency interference signals at multiple frequency points within a certain frequency band. Correspondingly, the frequency band of the above-mentioned antenna can cover the above-mentioned multiple frequency points, so that when it is placed at a preset position, it can receive magnetic field signals at multiple corresponding frequency points, and the receiver can determine the magnetic field strength of the preset position at multiple frequency points based on the magnetic field signals obtained by the antenna. It can be understood that, assuming there are N preset positions and M frequency points, the receiver can determine the magnetic field strength of each preset position at multiple frequency points, and a total of N*M magnetic field strengths can be determined.

[0080] The magnetic field analysis device is introduced below.

[0081] Please refer to Figure 6 As shown, the magnetic field analysis device exemplarily includes: a comparison unit and an output unit. After receiving the magnetic field strength sent by the magnetic field detection device, the magnetic field analysis device compares and analyzes the received magnetic field strength with the target magnetic field strength through the comparison unit, obtains the capability verification analysis result of the testing laboratory and outputs it.

[0082] In an embodiment of the present application, after receiving the magnetic field strength information sent by the magnetic field detection device, the magnetic field analysis device compares and analyzes the information with the standard magnetic field strength information at the same frequency stored in the storage unit, thereby determining the capability of the detection laboratory.

[0083] In a preferred embodiment, in the process of verifying the capability of the testing laboratory, the magnetic field detection device obtains the magnetic field strength around the sample vehicle in real time and sends it to the magnetic field analysis device. After obtaining the real-time received magnetic field strength information, the magnetic field analysis device obtains the standard magnetic field strength information of the same frequency from the storage unit according to the frequency corresponding to the currently received magnetic field strength for comparison and analysis. After the comparison and analysis of the magnetic field strengths of all received frequency points are completed, the capability verification analysis results of the testing laboratory are output. In this embodiment, when obtaining the standard magnetic field strength information of the same frequency from the storage unit, the standard magnetic field strength information of the same position and the same frequency can also be obtained from the storage unit according to the position corresponding to the received magnetic field strength, such as the front of the vehicle, the parking space, the two sides of the vehicle body, etc. In this embodiment, by real-time detection and analysis and processing, while completing the verification of the capability of the testing laboratory, the efficiency of the comparison and analysis processing can also be improved.

[0084] In another preferred embodiment, in the process of verifying the capabilities of the testing laboratory, the magnetic field analysis device, after receiving all the magnetic field strength information within a specified frequency band, such as the frequency band of 150kHz~30MHz, compares and analyzes the received magnetic field strengths one by one with the target magnetic field strengths with the same frequency, and outputs the capabilities verification analysis results of the testing laboratory.

[0085] In other embodiments of the present application, after receiving the magnetic field strengths obtained from multiple testing laboratories, the magnetic field analysis device in all the above embodiments can designate one of the testing laboratories as the target testing laboratory, use the magnetic field strength of the target testing laboratory as the target magnetic field strength, compare and analyze the target magnetic field strength with the magnetic field strengths of other testing laboratories, and compare and analyze the magnetic field strengths of the same frequency of other testing laboratories with the target testing laboratory, thereby determining the capability differences of different testing laboratories. In a preferred embodiment, in the process of verifying the capability of the testing laboratory, the magnetic field detection device obtains the magnetic field strength information around the sample vehicles of different testing laboratories in real time, and sends it to the magnetic field analysis device synchronously. The magnetic field analysis device uses the magnetic field strength of one of the testing laboratories as the target magnetic field strength and compares and analyzes the magnetic field strength of other testing laboratories according to the received user operation instructions. During the comparison and analysis, the magnetic field strengths of the same frequency of the target testing laboratory and other testing laboratories are compared and analyzed. After the comparison and analysis of the magnetic field strengths of all received frequency points are completed, the capability verification analysis results of the testing laboratory are output. In another preferred embodiment, in the process of verifying the capability of the testing laboratory, the magnetic field analysis device, after receiving all the magnetic field strength information of all testing laboratories in a specified frequency band, such as the frequency band of 150kHz~30MHz, compares and analyzes the received magnetic field strengths one by one with the target magnetic field strengths with the same frequency, and outputs the capability verification analysis results of the testing laboratory.

[0086] In other embodiments of the present application, the magnetic field analysis device in all the above embodiments further has a storage unit for storing standard magnetic field strength information, and at the same time, for storing the magnetic field strength information sent by the receiving magnetic field detection device. In a preferred embodiment, when the magnetic field analysis device receives magnetic field strength information from multiple testing laboratories, the information of the testing laboratories is also associated with the magnetic field strength information and stored separately, so as to facilitate the subsequent comparison and analysis, and to quickly obtain the corresponding magnetic field strength information according to the testing laboratory information.

[0087] In other embodiments of the present application, the magnetic field analysis device in all the above embodiments also includes a control unit, which is connected to the interference generating device, and sends a control instruction to the interference generating device according to the received user operation, so that the interference generating device transmits a radio frequency interference signal of a predetermined frequency band, such as a radio frequency interference signal of a frequency band of 150kHz~30MHz. In a preferred embodiment, in order to facilitate accurate and rapid completion of the test verification, when controlling the interference generating device to transmit the radio frequency interference signal, the user can control the interference generating device to transmit a frequency point radio frequency signal within the frequency band of 150kHz~30MHz through the control unit of the magnetic field analysis control, for example: at 0.3MHz, 0.5MHz, 0.8MHz, 1MHz, 5MHz, 10MHz, 15MHz, 20MHz, 25MHz, 30MH and other 10 frequency points. The radio frequency interference signal generated, in this embodiment, the above 10 frequency points are only exemplary descriptions and cannot be used as a limiting description of the protection scope. The user can control the interference generating device to transmit a radio frequency interference signal of a fewer frequency point through the control unit of the magnetic field analysis device, and can also control the generation of radio frequency interference signals of more frequency points. In an embodiment of the present application, before the magnetic field analysis device performs analysis through the comparison unit, the user can also determine the target magnetic field strength from the magnetic field strengths stored in the storage unit through the control unit for comparative analysis. The user can determine the appropriate target magnetic field strength by selection, thereby improving the accuracy of capability verification.

[0088] refer to Figure 8 As shown, the present invention provides a capability verification method for a low-frequency electromagnetic field emission intensity detection laboratory, the capability verification method comprising:

[0089] Controlling the sample vehicle to generate a magnetic field signal of a predetermined frequency band inside the testing laboratory;

[0090] In the embodiments of the present application, since different suppliers' testing laboratories use different solutions, the testing laboratories they built show different site characteristics when testing the electromagnetic field emission intensity of the vehicle. In order to ensure the correctness and reproducibility of the verification results, and at the same time reduce the differences in the test results between the testing laboratories, in the capability verification method of the present invention, a predetermined magnetic field signal is generated inside the testing laboratory by controlling the sample vehicle. In one example, the above-mentioned capability verification method can be used for a low-frequency electromagnetic field emission intensity detection laboratory, and the above-mentioned low-frequency electromagnetic field specifically refers to an electromagnetic field with a frequency band of 150KHz~30MHz. Therefore, it is necessary to control the sample vehicle as the source of the standard magnetic field to generate a magnetic field signal with a frequency band of 150kHz~30MHz. It can be understood that if it is necessary to conduct capability verification on a testing laboratory that can detect other frequency bands, it is necessary to control the sample vehicle to generate magnetic field signals of other frequency bands.

[0091] It should be noted that the above 10 frequency points are only exemplary and cannot be used as a limitation on the scope of protection.

[0092] Similarly, when it is necessary to generate a magnetic field signal in other frequency bands, the magnetic field signal can also be generated at multiple frequency points in other frequency bands, which will not be described in detail here.

[0093] refer to Fig. 9 As shown, the step of controlling the sample vehicle to generate a magnetic field signal of a predetermined frequency band in the testing laboratory includes:

[0094] Controlling a radio frequency generating device to generate a radio frequency interference signal in a predetermined frequency band;

[0095] Amplifying the radio frequency interference signal and injecting it into the sample vehicle via a ground line;

[0096] The sample vehicle generates a magnetic field signal of the predetermined frequency band inside the testing laboratory based on the amplified radio frequency interference signal.

[0097] In an embodiment of the present application, in order to control the sample vehicle to generate a magnetic field signal in the frequency band of 150KHz~30MHz inside the testing laboratory, the above-mentioned radio frequency generating device can further select a conductive comb source with a frequency band of 150kHz~30MHz to generate a radio frequency interference signal with a frequency band of 150kHz~30MHz, and pass an amplifying injection device with a frequency band of 150KHz~30MHz to amplify the radio frequency interference signal, and then inject it into the grounding wire of the sample vehicle through the radio frequency line connected to the BCI probe, thereby controlling the sample vehicle to generate a magnetic field signal with a frequency band of 150kHz~30MHz. In a preferred embodiment, in order to facilitate the accurate and rapid completion of the capability verification of the testing laboratory, the radio frequency generating equipment is controlled to generate radio frequency interference signals at multiple frequency points within 150KHz~30MHz, for example: radio frequency interference signals generated at 10 frequency points such as 0.3MHz, 0.5MHz, 0.8MHz, 1MHz, 5MHz, 10MHz, 15MHz, 20MHz, 25MHz, 30MHz, etc. It should be noted that the above 10 frequency points are only for exemplary purposes and cannot be used as a limitation on the scope of protection.

[0098] Similarly, when the RF generating device is required to generate RF interference signals in other frequency bands, the RF interference signals can also be generated at multiple frequency points within other frequency bands, which will not be elaborated here.

[0099] Obtaining the magnetic field strength at a preset position of the sample vehicle;

[0100] In an embodiment of the present application, after controlling the sample vehicle to generate a magnetic field signal of a predetermined frequency band, the corresponding magnetic field strength is obtained at a preset position of the sample vehicle. Specifically, the preset position may be one or more. When there are multiple preset positions, the multiple preset positions may be located in different directions of the sample vehicle. The above-mentioned different directions exemplarily include at least two directions of left, right, head, tail, etc., or exemplarily include at least two directions of left, right, head, tail, up, down, etc. Of course, those skilled in the art may also flexibly select a direction as needed, for example, selecting a direction with an angle of 45 degrees, 30 degrees, etc. with the center line of the front of the vehicle, which will not be elaborated here. At least one preset position may be set in the selected direction.

[0101] refer to Fig.10 As shown, the step of obtaining the magnetic field strength of the preset position of the sample vehicle includes:

[0102] Acquire a magnetic field signal at a preset position through an antenna;

[0103] The receiver determines the corresponding magnetic field strength according to the magnetic field signal.

[0104] In an embodiment of the present application, one or more antennas are arranged at preset positions around the sample vehicle to obtain the magnetic field strength around the vehicle. In an exemplary scenario, if there is only one antenna and only one preset position needs to be obtained, then when placing the antenna, the antenna only needs to be placed at the preset position of the sample vehicle, for example, the antenna is placed at a position 3 meters away from the center line of the front of the sample vehicle and the error does not exceed 0.03 meters. In another exemplary scenario, when there is only one antenna and the magnetic field strength at multiple preset positions around the sample vehicle needs to be obtained, in the process of obtaining the magnetic field strength, the antenna can be placed at each preset position around the sample vehicle in sequence, for example, placed at the front of the vehicle in sequence, so as to collect magnetic field strength information at preset positions on both sides of the vehicle body. Exemplarily, the preset position in the direction of the front of the vehicle can be selected to be located on the center line of the front of the vehicle, and the error is not more than 0.03 meters away from the front of the vehicle, and the preset position in the direction of the rear of the vehicle can be selected to be located on the center line of the rear of the vehicle, and the error is not more than 0.03 meters away from the rear of the vehicle. The preset position on the left side of the vehicle body may include: on the left side of the sample vehicle, and on the center line between the front and rear axles, at a distance of 3 meters from the left side of the vehicle with an error of no more than 0.03 meters. The preset position on the right side of the vehicle body is similar and will not be elaborated here.

[0105] In another exemplary scenario, when there are multiple antennas, for example four, the four antennas are placed at preset positions at the front, rear, and both sides of the vehicle body, so that when acquiring magnetic field signals, the magnetic field strength information of multiple preset positions in the same frequency band magnetic field can be simultaneously acquired, thereby improving the efficiency of magnetic field information acquisition. The preset positions at the front, rear, and both sides of the vehicle body can be referred to in the above description and will not be repeated here.

[0106] As mentioned above, the sample vehicle can generate magnetic field signals at multiple frequency points within a certain frequency band. Correspondingly, the frequency band of the above antenna can cover the above multiple frequency points. In this way, when it is placed at a preset position, it can receive magnetic field signals at multiple corresponding frequency points, and the receiver can determine the magnetic field strength of the preset position at multiple frequency points based on the magnetic field signals obtained by the antenna. It can be understood that, assuming there are N preset positions and M frequency points, the receiver can determine the magnetic field strength of each preset position at multiple frequency points, and a total of N*M magnetic field strengths can be determined.

[0107] In an embodiment of the present application, the antenna for obtaining magnetic field information may be a loop antenna. When placing the loop antenna, the center of the loop antenna is kept at a height of 1.3 meters from the ground with an error of 0.05 meters. Setting it at this height enables the antenna to fully receive the magnetic field information of the sample vehicle without being affected by ground reflection. After the magnetic field signal is obtained through the antenna, the receiver further determines the corresponding magnetic field strength based on the obtained magnetic field signal. In an embodiment of the present application, the receiver uses an EMI test receiver, which can determine the corresponding magnetic field strength based on the current in the loop antenna.

[0108] The magnetic field strength is analyzed and processed to determine the capability of the testing laboratory.

[0109] In an embodiment of the present application, after obtaining the magnetic field strength at the preset position of the sample vehicle, the magnetic field strength is further compared and analyzed with the target magnetic field strength. In one embodiment, the target magnetic field strength may be a standard magnetic field strength obtained by a standard laboratory and a standard vehicle, and the capability of the testing laboratory is determined by comparing and analyzing the magnetic field strength of the obtained testing laboratory with the standard magnetic field strength; in another embodiment, when there are multiple testing laboratories that need to be verified for capability, the target magnetic field strength may be the magnetic field strength obtained by specifying one of the testing laboratories, and the capability difference between different testing laboratories can be determined by comparing and analyzing the magnetic field strength of the specified testing laboratory with that of other testing laboratories. After confirming the capability of the testing laboratory, the analysis results are output according to the needs of the user, for example, the analysis results are output to the target terminal for storage and display; the analysis results are sent to the printer for print output, etc. The above output method of the analysis results is only an exemplary explanation, and cannot be used as a limiting interpretation of the scope of protection. Other output methods based on this idea are within the scope of protection of this application and will not be repeated here.

[0110] In an exemplary scenario, when the magnetic field strengths of multiple testing laboratories or multiple sets of standard magnetic field strengths are stored, before performing the magnetic field strength analysis and processing, it is also possible to select a suitable magnetic field strength from the magnetic field strengths of multiple testing laboratories or multiple sets of standard magnetic field strengths as the current target magnetic field strength based on the selection instructions input by the user.

[0111] refer to Fig.11 As shown, the step of analyzing and processing the magnetic field strength to determine the capability of the testing laboratory includes:

[0112] Obtaining a difference between the magnetic field strength and a target magnetic field strength;

[0113] The difference is compared and analyzed with a preset magnetic field difference threshold.

[0114] In an embodiment of the present application, when the target magnetic field strength is the standard magnetic field strength, after obtaining the magnetic field strength of the testing laboratory, a difference processing is performed with the standard magnetic field strength, and the obtained difference is compared and analyzed with a preset magnetic field difference threshold. When the obtained difference is within the preset magnetic field difference threshold range, it is determined that the capability of the testing laboratory meets the testing conditions; and when the obtained difference is not within the preset magnetic field difference threshold range, it is determined that the capability of the testing laboratory does not meet the testing conditions. Reference Fig.12As shown, the differences between the test results of the testing laboratory and the target magnetic field strength at 10 frequencies of 0.3MHz, 0.5MHz, 0.8MHz, 1MHz, 5MHz, 10MHz, 15MHz, 20MHz, 25MHz, and 30MHz are all within the magnetic field difference threshold range of -4dB / m to 4dB / m. Therefore, the testing laboratory meets the requirements for testing.

[0115] In the embodiment of the present application, when the target magnetic field strength is the magnetic field strength of the designated testing laboratory, the change curves of the magnetic field strength at each frequency point of the designated testing laboratory and other testing laboratories are compared to determine whether the capabilities of the two testing laboratories meet the requirements, referring to Fig.13 As shown, the magnetic field strength curve information of other testing laboratories and the designated testing laboratory at frequencies of 0.3MHz, 0.5MHz, 0.8MHz, 1MHz, 5MHz, 10MHz, 15MHz, 20MHz, 25MHz, and 30MHz respectively. By judging that the magnetic field strength curves of other testing laboratories are close to that of the designated testing laboratory, the performance of the two testing laboratories is close and meets the requirements for testing.

[0116] In summary, the capability verification system and method of the low-frequency electromagnetic field emission intensity detection laboratory of the present invention improves and supplements the existing standard method and improves the standard source (sample vehicle), that is, the standard sample vehicle is used as the emission source and the loop antenna is used as the receiving source, thereby improving the applicability in the actual test of the difference comparison between different laboratories. At the same time, the method has the advantages of convenience, simplicity of operation, and significant comparison. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0117] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A capability verification system for a low-frequency electromagnetic field emission intensity detection laboratory, characterized in that: The proficiency verification system comprises: A sample vehicle disposed inside the testing laboratory; an interference generating device, connected to the sample vehicle, and used to generate a magnetic field signal inside the testing laboratory through the sample vehicle; A magnetic field detection device, used to obtain the magnetic field strength at a preset position in the detection laboratory; The magnetic field analysis device is used to analyze and process the magnetic field strength detected by the magnetic field detection device and the target magnetic field strength to determine the capability of the detection laboratory.

2. The capability verification system according to claim 1, characterized in that: The interference generating device comprises: A radio frequency generating device, used to generate a radio frequency interference signal in a predetermined frequency band; The amplification and injection device is respectively connected to the RF generating device and the grounding wire of the sample vehicle, and is used to amplify the RF interference signal and inject the amplified RF interference signal into the grounding wire so that the sample vehicle generates a magnetic field signal of a predetermined frequency band.

3. The capability verification system according to claim 1, characterized in that: The magnetic field detection device comprises: at least one antenna, disposed at a preset position of the sample vehicle, for acquiring a magnetic field signal emitted by the sample vehicle; A receiver is connected to the at least one antenna and is used to determine the corresponding magnetic field strength according to the acquired magnetic field signal.

4. The capability verification system according to claim 1, characterized in that: The magnetic field analysis device comprises: A comparison unit, used for analyzing and processing the magnetic field intensity obtained by the magnetic field detection device and the target magnetic field intensity; The output unit is used to output the result of the comparison processing performed by the comparison unit.

5. The capability verification system according to claim 4, characterized in that: The target magnetic field strength includes: Standard magnetic field strength, and / or, magnetic field strength obtained by a specified testing laboratory.

6. The capability verification system according to claim 5, characterized in that: The magnetic field analysis device also includes: A storage unit is used to store the standard magnetic field strength information and / or the magnetic field strength information obtained by the designated testing laboratory.

7. The capability verification system according to any one of claims 1 to 6, characterized in that: The magnetic field analysis device also includes a control unit connected to the interference generating device and configured to send a control instruction to the interference generating device so that the sample vehicle generates a magnetic field signal.

8. A capability verification method for a low-frequency electromagnetic field emission intensity detection laboratory, characterized in that: The proficiency verification method comprises: Controlling the sample vehicle to generate a magnetic field signal of a predetermined frequency band inside the testing laboratory; Obtaining the magnetic field strength at a preset position of the sample vehicle; The magnetic field strength and the target magnetic field strength are analyzed and processed to determine the capability of the testing laboratory.

9. The capability verification method according to claim 8, characterized in that: The step of controlling the sample vehicle to generate a magnetic field signal of a predetermined frequency band inside the testing laboratory comprises: Controlling a radio frequency generating device to generate a radio frequency interference signal in a predetermined frequency band; Amplifying the radio frequency interference signal and injecting it into the sample vehicle via a ground line; The sample vehicle generates a magnetic field signal of the predetermined frequency band inside the testing laboratory based on the amplified radio frequency interference signal.

10. The capability verification method according to claim 8, characterized in that: The step of obtaining the magnetic field strength of the preset position of the sample vehicle includes: Acquire a magnetic field signal at a preset position through an antenna; The receiver determines the corresponding magnetic field strength according to the magnetic field signal.

11. The capability verification method according to claim 8, characterized in that: The step of analyzing and processing the magnetic field strength to determine the capability of the testing laboratory comprises: Obtaining a difference between the magnetic field strength and a target magnetic field strength; The difference is compared and analyzed with a preset magnetic field difference threshold.

12. The capability verification method according to claim 11, characterized in that: The target magnetic field strength includes a standard magnetic field strength and / or a magnetic field strength obtained by a designated testing laboratory.

13. The capability verification method according to claim 11, characterized in that: The analysis and processing results include: If the difference is within the preset magnetic field difference threshold range, it is determined that the laboratory meets the experimental conditions; and / or, If the difference is not within the preset magnetic field difference threshold range, it is determined that the laboratory does not meet the experimental conditions.

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