Axle counter immunity test system, method, device, equipment, medium and product

Abstract

The invention relates to the technical field of axle counter immunity testing, in particular to an axle counter immunity testing system, method, device and equipment, a medium and a product, and the system comprises a measuring unit which is arranged on a track and is used for measuring the amplitude and frequency of an interference signal; the injection unit is arranged to rotate around the measurement unit and emit interference signals in different directions; by arranging the axle counter immunity testing system comprising the measuring unit and the injection unit, the injection unit rotates around the measuring unit and emits interference signals in different directions, so that interference magnetic fields in different directions can be simulated, and the immunity of the axle counter under interference in different directions can be comprehensively evaluated.

Description

Technical Field

[0001] This invention relates to the field of axle counter immunity testing technology, and particularly to an axle counter immunity testing system, method, apparatus, equipment, medium, and product. Background Technology

[0002] With the accelerated application of domestically produced axle counters, more and more of these counters are being used on domestic railway lines. However, due to the lack of methods for measuring the magnetic field immunity of axle counters, it is often difficult to effectively assess whether locomotives and rolling stock pose an interference risk to the axle counters during electromagnetic compatibility certification testing of locomotives and rolling stock with domestically produced axle counters. This could lead to a series of safety hazards after the vehicles are put into operation. There is a technical problem in this field regarding the difficulty in assessing the immunity of axle counters. Summary of the Invention

[0003] This invention provides a system, method, apparatus, equipment, medium, and product for testing the immunity of axle counters, solving the technical problem of difficulty in evaluating the immunity of axle counters.

[0004] In a first aspect, the present invention provides a shaft counter immunity testing system, comprising: a measuring unit disposed on a track for measuring the amplitude and frequency of interference signals; and an injection unit configured to rotate around the measuring unit and emit interference signals in different directions.

[0005] In some embodiments, the measurement unit includes a measurement antenna or an axis counter, wherein the measurement antenna includes a triaxial magnetic field antenna, and the triaxial magnetic field antenna includes a high-frequency antenna and a low-frequency antenna.

[0006] In some embodiments, the injection unit includes: an injection antenna; the uniformity of the magnetic field within a preset distance from the center point of the injection antenna is less than a preset magnetic field threshold; when the injection antenna rotates around the measurement unit, the distance between the injection antenna and the center point of the measurement unit is a preset distance.

[0007] Secondly, the present invention provides a method for testing the immunity of a shaft counter based on any of the above-mentioned shaft counter immunity testing systems. The method includes: setting the measuring unit as a shaft counter; setting the frequency of the interference signal as the most sensitive frequency of the shaft counter; setting the injection unit at a preset position and gradually increasing the amplitude of the interference signal until the shaft counter outputs a pulse; and recording the correspondence between the preset position and the current amplitude of the interference signal.

[0008] In some embodiments, the method further includes: setting the measurement unit as a measurement antenna; recording the magnetic field strength measured by the measurement antenna at a preset position and under the action of the corresponding interference signal; and correcting the magnetic field strength when the most sensitive angle of the injection unit is within a preset angle range.

[0009] In some embodiments, the method further includes: plotting the immunity-interference duration curve of the axle counter; and / or plotting the filter amplitude-frequency response curve of the axle counter.

[0010] Thirdly, the present invention provides a shaft counter immunity testing device based on a shaft counter immunity testing system, the device comprising:

[0011] The first setting module is used to set the measuring unit as a shaft counter;

[0012] The second setting module is used to set the frequency of the interference signal to the most sensitive frequency of the shaft counter.

[0013] The control module is used to set the injection unit to a preset position and gradually increase the amplitude of the interference signal until the shaft counter outputs a pulse;

[0014] The recording module is used to record the correspondence between the preset position and the current amplitude of the interference signal.

[0015] Fourthly, the present invention provides a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any of the above-described axle counter immunity test methods.

[0016] Fifthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-described methods for testing the immunity of a shaft counter.

[0017] In a sixth aspect, the present invention provides a computer program product, including a computer program that, when executed by a processor, implements the steps of any of the above-described methods for testing the immunity of a shaft counter.

[0018] This invention provides a shaft counter immunity testing system, method, apparatus, device, medium, and product. The system includes: a measuring unit mounted on a track for measuring the amplitude and frequency of interference signals; and an injection unit configured to rotate around the measuring unit and emit interference signals in different directions. By setting up a shaft counter immunity testing system including the measuring unit and the injection unit, wherein the injection unit rotates around the measuring unit and emits interference signals in different directions, it is possible to simulate interference magnetic fields in different directions to comprehensively evaluate the immunity of the shaft counter under interference in different directions. Attached Figure Description

[0019] The invention will now be described in more detail with reference to embodiments and the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the structure of a shaft counter immunity testing system provided in an embodiment of this application;

[0021] Figure 2 This is a schematic flowchart of a shaft counter immunity test method provided in an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the structure of a shaft counter immunity testing device provided in an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the anti-interference evaluation of the shaft counter disclosed in an embodiment of the present invention;

[0024] Figure 5 This is a front view schematic diagram of the XZ plane magnetic field immunity measurement setup in the direction of α = 0° as disclosed in an embodiment of the present invention.

[0025] Figure 6 This is a side view schematic diagram of an XZ plane magnetic field immunity measurement system provided in an embodiment of this application;

[0026] Figure 7 This is a front view schematic diagram of a YZ plane magnetic field immunity measurement setup provided in an embodiment of this application;

[0027] Figure 8 This is a schematic diagram of a forward-looking measurement setup for the YZ plane magnetic field immunity α = 0° direction provided in an embodiment of this application;

[0028] Figure 9 This is a schematic diagram of a magnetic field injection antenna provided in an embodiment of this application;

[0029] Figure 10 This is a schematic diagram of a measurement antenna structure provided in an embodiment of this application;

[0030] Figure 11 This is a schematic diagram illustrating the response of a shaft counter to intermittent sinusoidal interference, as provided in an embodiment of this application.

[0031] Figure 12 This is a schematic diagram of a measurement curve of axis immunity-interference duration provided in an embodiment of this application;

[0032] Figure 13 This is a schematic diagram of the filtered amplitude-frequency response of an axle counter provided in an embodiment of this application.

[0033] In the accompanying drawings, the same parts are referred to by the same reference numerals, and the drawings are not drawn to scale. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present invention and to fully understand and implement the process of how the present invention uses technical means to solve technical problems and achieve corresponding technical effects, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The embodiments of the present invention and the various features therein can be combined with each other without conflict, and the resulting technical solutions are all within the protection scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0035] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0036] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0037] With the accelerated application of domestically produced axle counters, more and more of these counters are being used on domestic railway lines. However, due to the lack of methods for measuring the magnetic field immunity of axle counters, it is often difficult to effectively assess whether locomotives and rolling stock pose an interference risk to the axle counters during electromagnetic compatibility certification testing of locomotives and rolling stock with domestically produced axle counters. This could lead to a series of safety hazards after the vehicles are put into operation. There is a technical problem in this field regarding the difficulty in assessing the immunity of axle counters.

[0038] The technical solution of this application will be described below with reference to specific embodiments.

[0039] Example 1

[0040] Figure 1 This is a schematic diagram of the structure of a shaft counter immunity testing system provided in an embodiment of this application. Figure 1 As shown in the technical solution of this embodiment, a shaft counter immunity testing system is provided, including: a measuring unit, which is set on a track and used to measure the amplitude and frequency of interference signals; and an injection unit, which is configured to rotate around the measuring unit and emit interference signals in different directions.

[0041] In the immunity test of axle counters, it is difficult to determine the impact of interference signals from different directions on the axle counter. There is a technical problem in the field that the immunity of axle counters under interference from different directions cannot be fully evaluated.

[0042] The technical solution of this embodiment utilizes a shaft counter immunity testing system comprising a measurement unit and an injection unit. The injection unit rotates around the measurement unit, emitting interference signals in different directions to simulate interference magnetic fields from different directions, thereby comprehensively evaluating the shaft counter's immunity to interference from various directions. In the application examples described later, the measurement unit can be the shaft counter itself or a dedicated measurement antenna used to measure the amplitude and frequency of the interference signal. The injection unit can be an injection antenna with specific parameters, connected to a signal generator and a power amplifier to generate interference signals with adjustable frequency and amplitude.

[0043] In axle counter immunity testing, the impact of interference signals from different directions on the axle counter has historically been difficult to determine, making it challenging to comprehensively assess its immunity performance. This embodiment, however, utilizes an injection unit that rotates around the measurement unit, enabling the emission of interference signals in different directions. This comprehensively simulates various directions of interference magnetic fields that may occur in real-world working environments. For example, in rail transit systems, the high-power frequency converters on locomotives and rolling stock may generate magnetic field interference in different directions. The testing system in this embodiment can accurately measure the axle counter's immunity to interference from these different directions. This is crucial for improving the reliability and safety of axle counters. On one hand, a comprehensive assessment of the axle counter's immunity provides important guidance for its design and optimization, enabling it to better resist magnetic field interference from various directions in practical applications and ensuring the accuracy of track section occupancy / vacancy detection. On the other hand, it is significant for the application and replacement of domestically produced axle counters. With the acceleration of domestic production, more and more domestically produced axle counters are being put into use, but the magnetic field immunity indicators of these axle counters often lack clear measurement methods and reference standards. The testing system in this embodiment can fill this gap, providing an effective means for measuring the magnetic field immunity of domestic axle counters, accelerating the promotion and application of domestic axle counters, and improving the overall level of my country's rail transit train inspection system.

[0044] Example 2

[0045] Based on the above embodiments, the measurement unit includes: a measurement antenna or an axis counter, wherein the measurement antenna includes a triaxial magnetic field antenna, and the triaxial magnetic field antenna includes a high-frequency antenna and a low-frequency antenna.

[0046] In the immunity test of axle counters, the selection of the type of measurement unit is unclear, making it difficult to accurately measure interference signals in different frequency bands. There is a technical problem in this field where the measurement unit function is incomplete in the immunity test of axle counters.

[0047] The technical solution of this embodiment, by configuring the measurement unit to include a measurement antenna or an axis counter, wherein the measurement antenna includes a triaxial magnetic field antenna, and the triaxial magnetic field antenna is divided into a high-frequency antenna and a low-frequency antenna, can select a suitable measurement unit according to different testing requirements and accurately measure interference signals in different frequency bands. In the application examples described later, the electrical parameters of the measurement antenna are specified, and it is divided into high-frequency magnetic field antennas and low-frequency magnetic field antennas according to the measurement frequency band. Different types of antennas have different technical parameters, which can meet the measurement requirements of different frequency bands.

[0048] In axle counter immunity testing, the selection of the measurement unit is crucial. Previously, due to the limited variety of measurement units, it was impossible to accurately measure interference signals across different frequency bands, resulting in an incomplete assessment of the axle counter's immunity. This embodiment, however, significantly improves the accuracy and comprehensiveness of the test by providing a variety of measurement unit options. For example, in actual testing, a suitable measurement unit can be selected based on the axle counter's operating frequency range and the characteristics of the interference signal. If the interference signal is mainly concentrated in the high-frequency band, a high-frequency magnetic field antenna can be selected for measurement; if the interference signal is more pronounced in the low-frequency band, a low-frequency magnetic field antenna can be used. Simultaneously, the axle counter itself can also serve as a measurement unit, allowing for direct measurement of the axle counter's response to interference signals in certain situations. This is of great significance for accurately assessing the axle counter's immunity. On one hand, it provides more detailed reference data for the design and optimization of the axle counter. By accurately measuring interference signals in different frequency bands, the immunity performance of the axle counter at different frequencies can be understood, allowing for targeted improvements and optimizations to enhance the axle counter's anti-interference capability. On the other hand, it is also of significant value for electromagnetic compatibility certification testing of locomotives and rolling stock with axle counters. In certification testing, it is necessary to accurately measure the axle counter's immunity to interference signals of different frequency bands to determine whether locomotives and rolling stock will interfere with the axle counter. The technical solution in this embodiment provides a reliable measurement method for certification testing, ensuring the safety and reliability of the train inspection system.

[0049] Example 3

[0050] Based on the above embodiments, the injection unit includes: an injection antenna; within a preset distance of the center point of the injection antenna, the uniformity of the magnetic field is less than a preset magnetic field threshold; when the injection antenna rotates around the measurement unit, the distance between the injection antenna and the center point of the measurement unit is a preset distance.

[0051] In the immunity test of axle counters, it is difficult to ensure the uniformity of the interfering magnetic field, and the positional relationship between the injection unit and the measurement unit is unclear, which affects the accuracy of the test results. There are technical problems in the field of axle counter immunity test such as non-uniform interfering magnetic field and uncertain positional relationship.

[0052] The technical solution of this embodiment, by setting the injection unit to an injection antenna with specific parameters, ensures that the uniformity of the magnetic field within a preset distance from the center point of the injection antenna is less than a preset magnetic field threshold. Furthermore, when the injection antenna rotates around the measurement unit, the distance between the injection antenna and the center point of the measurement unit remains at a preset distance. This guarantees the uniformity of the interfering magnetic field, clarifies the positional relationship between the injection unit and the measurement unit, and improves the accuracy of the test results. The application examples described later detail the electrical parameters and usage of the injection antenna. Through optimized design of the injection antenna, the uniformity of the interfering magnetic field during the test is ensured.

[0053] In axle counter immunity testing, the uniformity of the interfering magnetic field and the positional relationship between the injection unit and the measurement unit directly affect the accuracy of the test results. Previously, the lack of effective control over these factors led to low reliability of the test results. This embodiment effectively solves these problems through optimized design of the injection antenna. First, by controlling the uniformity of the magnetic field within a preset distance from the center point of the injection antenna, it ensures that the interfering magnetic field experienced by the axle counter is uniform during the test. This is crucial for accurately assessing the immunity of the axle counter. For example, in actual testing, if the interfering magnetic field is not uniform, the interference intensity experienced by the axle counter at different locations will vary, leading to deviations in the test results. The technical solution of this embodiment can guarantee the uniformity of the interfering magnetic field, making the test results more accurate and reliable. Second, the distance between the center point of the injection antenna and the measurement unit is defined as a preset distance, which helps maintain a stable positional relationship between the interference source and the measured object during the test. In different test scenarios, the preset distance can be adjusted according to actual needs to ensure the repeatability and comparability of the test results. This is of great significance for electromagnetic compatibility certification testing of locomotives and axle counters. By accurately controlling the uniformity of the interfering magnetic field and the positional relationship between the injection unit and the measurement unit, more reliable test data can be provided for certification testing, thereby effectively assessing whether locomotives and rolling stock will interfere with the axle counter and improving the safety of the train inspection system.

[0054] Example 4

[0055] Figure 2 This is a flowchart illustrating a method for testing the immunity of a shaft counter according to an embodiment of this application. Figure 2 As shown, in the technical solution of this embodiment, a method for testing the immunity of a shaft counter based on any of the above embodiments of the shaft counter immunity test system is provided. The method includes: setting the measuring unit as a shaft counter; setting the frequency of the interference signal as the most sensitive frequency of the shaft counter; setting the injection unit at a preset position, gradually increasing the amplitude of the interference signal until the shaft counter outputs a pulse; and recording the correspondence between the preset position and the current amplitude of the interference signal.

[0056] In the immunity test of axle counters, there is a lack of clear test methods and procedures, making it difficult to accurately measure the immunity of axle counters under different interference signals. There is a technical problem in this field where the test method for immunity of axle counters is unclear.

[0057] The technical solution of this embodiment, by setting the measuring unit as a shaft counter and setting the frequency of the interference signal as the most sensitive frequency of the shaft counter, wherein the interference signal includes continuous signals and / or intermittent signals, sets the injection unit at a preset position, gradually increases the amplitude of the interference signal until the shaft counter outputs a pulse, and records the correspondence between the preset position and the current amplitude of the interference signal, thereby clarifying the method and steps for testing the immunity of the shaft counter, and enabling accurate measurement of the immunity of the shaft counter under different interference signals. The application examples described later detail the measurement methods for determining the immunity of the shaft counter to continuous magnetic fields and intermittent magnetic fields; the technical solution of this embodiment is a specific implementation of these methods.

[0058] In the immunity testing of axle counters, a clear test method and procedure are crucial to ensuring the accuracy and reliability of the test results. Previously, the lack of a clear test method led to significant uncertainty during the testing process, making it difficult to accurately measure the immunity of the axle counter under different interference signals. This embodiment effectively solves this problem through a clear test method and procedure. First, by setting the measurement unit to the axle counter, the response of the axle counter to interference signals under actual working conditions can be directly measured. By setting the frequency of the interference signal to the most sensitive frequency of the axle counter, the immunity performance of the axle counter at the frequency most susceptible to interference can be more accurately evaluated. Second, the consideration of interference signals, including both continuous and intermittent signals, comprehensively covers various interference situations that may occur in the actual working environment. During the test, the injection unit is set at a preset position, and the amplitude of the interference signal is gradually increased until the axle counter outputs a pulse. Then, the correspondence between the preset position and the current amplitude of the interference signal is recorded. This process can accurately determine the immunity threshold of the axle counter. For example, in the electromagnetic compatibility certification testing of locomotives and axle counters, the testing method of this embodiment can accurately measure the immunity of the axle counter to different types of interference signals generated by locomotives and rolling stock, thus providing a reliable basis for certification testing. This is of great significance for improving the safety and reliability of train detection systems. On the one hand, it can provide specific guidance for the design and optimization of axle counters. By accurately measuring the immunity of the axle counter under different interference signals, we can understand the weaknesses of the axle counter and make targeted improvements and optimizations to enhance its anti-interference capability. On the other hand, it is also of great value for ensuring the safe operation of locomotives and rolling stock. By accurately assessing the immunity of the axle counter, we can ensure that locomotives and rolling stock will not interfere with the axle counter during operation, thereby avoiding safety accidents caused by the axle counter misjudging the occupancy / vacancy status of track sections.

[0059] Example 5

[0060] Based on the above embodiments, the method further includes: setting the measurement unit as a measurement antenna; recording the magnetic field strength measured by the measurement antenna at a preset position and under the action of the corresponding interference signal; and correcting the magnetic field strength when the most sensitive angle of the injection unit is within a preset angle range.

[0061] In the immunity test of axle counters, when the most sensitive angle of the injection unit is within a specific range, it is unclear how to correct the measurement results, which affects the accuracy of the test results. There is a technical problem in this field where the correction method for the immunity test results of axle counters is unclear.

[0062] The technical solution of this embodiment sets the measuring unit as a measuring antenna and records the magnetic field strength measured by the measuring antenna at a preset position and under the action of corresponding interference signals. When the most sensitive angle of the injection unit is within a preset angle range, the magnetic field strength is corrected, thereby clarifying the correction method for the measurement results under specific conditions and improving the accuracy of the test results. In the application examples described later, a method for correcting the measured value when the most sensitive angle is within a preset angle range is detailed in the measurement method for determining the immunity of the shaft counter to continuous magnetic fields. The technical solution of this embodiment is a specific implementation of this method.

[0063] In axle counter immunity testing, correcting the measurement results is crucial when the most sensitive angle of the injection unit is within a specific range. Previously, the lack of a clear correction method affected the accuracy of test results in such situations. This embodiment effectively solves this problem through a clear correction method. First, setting the measurement unit as a measurement antenna allows for more accurate measurement of magnetic field strength. By recording the magnetic field strength measured by the measurement antenna at a preset position and under corresponding interference signals, more detailed test data can be obtained. Correcting the magnetic field strength when the most sensitive angle of the injection unit is within a preset angle range improves the accuracy of the test results. For example, in actual testing, without correction, the measurement results may show significant deviations when the most sensitive angle is within the preset angle range, affecting the accurate assessment of the axle counter immunity. The technical solution of this embodiment eliminates this deviation through correction, ensuring the reliability of the test results. This is of great significance for electromagnetic compatibility certification testing of locomotives and axle counters. Accurately correcting the measurement results provides a more accurate reference for certification testing, effectively assessing whether locomotives will interfere with the axle counter and improving the safety of the train inspection system. On the one hand, it can provide more precise guidance for the design and optimization of axle counters. By accurately measuring and calibrating the immunity of axle counters under different conditions, a deeper understanding of their performance characteristics can be gained, allowing for targeted improvements and optimizations to enhance their anti-interference capabilities. On the other hand, it is also of great value in ensuring the stable operation of rail transit systems. By accurately assessing the immunity of axle counters, it can be ensured that they can operate normally in various complex electromagnetic environments, thus providing a strong guarantee for the safe operation of rail transit systems.

[0064] Example 6

[0065] Based on the above embodiments, the method further includes: plotting the immunity-interference duration curve of the axle counter; and / or plotting the filter amplitude-frequency response curve of the axle counter.

[0066] In the immunity test of axle counters, there is a lack of methods for plotting the immunity-interference duration curve and the amplitude-frequency response curve of the filter, making it difficult to comprehensively evaluate the immunity performance of the axle counter. There is a technical problem in this field where the method for plotting curves in the immunity test of axle counters is unclear.

[0067] The technical solution of this embodiment clarifies the method of plotting curves in the immunity test of the axle counter by plotting the immunity-interference duration curve and / or the filter amplitude-frequency response curve of the axle counter, thereby enabling a comprehensive evaluation of the immunity performance of the axle counter.

[0068] In axle counter immunity testing, plotting immunity-interference duration curves and filter amplitude-frequency response curves is crucial for comprehensively evaluating the immunity performance of the axle counter. Previously, the lack of a clear curve plotting method made it difficult to accurately understand the immunity performance of the axle counter under different interference durations and frequencies. This embodiment effectively solves this problem through a clear curve plotting method. First, plotting the axle counter's immunity-interference duration curve visually demonstrates the axle counter's magnetic field immunity response to intermittent interference durations. By gradually increasing the interference duration and recording the changes in the axle counter's immunity, the integration time of the axle counter can be determined. This is very important for evaluating the performance of the axle counter under intermittent interference. For example, in practical applications, the magnetic field interference of locomotives and rolling stock may be intermittent. The immunity-interference duration curve can reveal the axle counter's immunity capability under such conditions, providing an important reference for electromagnetic compatibility certification testing of locomotives and rolling stock and axle counters. Second, plotting the axle counter's filter amplitude-frequency response curve reveals the axle counter's filtering characteristics for signals of different frequencies. By selecting a suitable injection plane and test signal frequency, the immunity of the axle counter at different frequencies is recorded, and the filter amplitude-frequency response curve is plotted, including points at 0dB, -3dB, and -20dB. This is of great value for analyzing the signal processing capability and anti-interference performance of the axle counter. For example, when designing the filter circuit of the axle counter, optimization can be performed based on the filter amplitude-frequency response curve to improve the anti-interference capability of the axle counter. This is of great significance for the application and replacement of domestically produced axle counters. With the acceleration of the localization process, more and more domestically produced axle counters need to undergo accurate immunity testing. The technical solution of this embodiment provides an effective means for testing the immunity of domestically produced axle counters. By plotting curves, the performance of domestically produced axle counters can be comprehensively evaluated, providing strong support for their application in domestic rail transit systems.

[0069] Example 7

[0070] Figure 3 This is a schematic diagram of the structure of a shaft counter immunity testing device provided in an embodiment of this application, as shown below. Figure 3As shown, based on the above embodiments, a shaft counter immunity testing device is also provided, comprising: a first setting module for setting the measuring unit as a shaft counter; a second setting module for setting the frequency of the interference signal as the most sensitive frequency of the shaft counter; a control module for setting the injection unit at a preset position and gradually increasing the amplitude of the interference signal until the shaft counter outputs a pulse; and a recording module for recording the correspondence between the preset position and the current amplitude of the interference signal.

[0071] In the immunity test of axle counters, there is a lack of clear test methods and procedures, making it difficult to accurately measure the immunity of axle counters under different interference signals. There is a technical problem in this field where the test method for immunity of axle counters is unclear.

[0072] The technical solution of this embodiment, by setting the measuring unit as a shaft counter and setting the frequency of the interference signal as the most sensitive frequency of the shaft counter, wherein the interference signal includes continuous signals and / or intermittent signals, sets the injection unit at a preset position, gradually increases the amplitude of the interference signal until the shaft counter outputs a pulse, and records the correspondence between the preset position and the current amplitude of the interference signal, thereby clarifying the method and steps for testing the immunity of the shaft counter, and enabling accurate measurement of the immunity of the shaft counter under different interference signals. The application examples described later detail the measurement methods for determining the immunity of the shaft counter to continuous magnetic fields and intermittent magnetic fields; the technical solution of this embodiment is a specific implementation of these methods.

[0073] In the immunity testing of axle counters, a clear test method and procedure are crucial to ensuring the accuracy and reliability of the test results. Previously, the lack of a clear test method led to significant uncertainty during the testing process, making it difficult to accurately measure the immunity of the axle counter under different interference signals. This embodiment effectively solves this problem through a clear test method and procedure. First, by setting the measurement unit to the axle counter, the response of the axle counter to interference signals under actual working conditions can be directly measured. By setting the frequency of the interference signal to the most sensitive frequency of the axle counter, the immunity performance of the axle counter at the frequency most susceptible to interference can be more accurately evaluated. Second, the consideration of interference signals, including both continuous and intermittent signals, comprehensively covers various interference situations that may occur in the actual working environment. During the test, the injection unit is set at a preset position, and the amplitude of the interference signal is gradually increased until the axle counter outputs a pulse. Then, the correspondence between the preset position and the current amplitude of the interference signal is recorded. This process can accurately determine the immunity threshold of the axle counter. For example, in the electromagnetic compatibility certification test of locomotives and axle counters, the test method of this embodiment can accurately measure the immunity of the axle counter to different types of interference signals generated by locomotives and vehicles, thus providing a reliable basis for certification testing. This is of great significance for improving the safety and reliability of train detection systems. On the one hand, it can provide specific guidance for the design and optimization of axle counters. By accurately measuring the immunity of the axle counter under different interference signals, we can understand the weaknesses of the axle counter and make targeted improvements and optimizations to enhance its anti-interference capability. On the other hand, it is also of great value for ensuring the safe operation of locomotives and vehicles. By accurately assessing the immunity of the axle counter, we can ensure that locomotives and vehicles will not interfere with the axle counter during operation, thereby avoiding safety accidents caused by the axle counter misjudging the occupancy / vacancy status of track sections. Other technical features and beneficial effects of this embodiment correspond to those of the above embodiments and will not be repeated here.

[0074] Example 8

[0075] In the technical solution of this embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory. The processor executes the computer program to implement the steps of any of the above embodiments of the shaft counter immunity test method.

[0076] In the technical solution of this embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, it implements the steps of any of the above embodiments of the shaft counter immunity test method.

[0077] In the technical solution of this embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of any of the above embodiments of the shaft counter immunity test method.

[0078] The processor may include, but is not limited to, one or more processors or microprocessors. Each processor may be implemented as an Application Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), controller, microcontroller, microprocessor, or other electronic component, for performing the methods in the above embodiments. The computer-readable storage medium may be implemented by any type of volatile or non-volatile storage device or a combination thereof, and may include, but is not limited to, random access memory (RAM), read-only memory (ROM), flash memory, EPROM memory, EEPROM memory, registers, computer storage media (e.g., hard disk, floppy disk, solid-state drive, removable disk, CD-ROM, DVD-ROM, Blu-ray disc, etc.).

[0079] Computer-readable storage media may also store at least one computer-executable program / instruction, such as computer-readable instructions. Computer-readable storage media include, but are not limited to, volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Computer-readable storage media may include, for example, read-only memory (ROM), hard disk, flash memory, etc.

[0080] For example, a non-transitory computer-readable storage medium can be connected to a computing device such as a computer, and then, when the computing device executes computer-readable instructions stored on the computer-readable storage medium, the various methods described above can be performed. In addition, the computer device may also include (but is not limited to) a data bus, an input / output (I / O) bus, a display, and input / output devices (e.g., a keyboard, mouse, speaker, etc.). The processor can communicate with external devices via the I / O bus through a wired or wireless network. In one embodiment, the at least one computer-executable instruction may also be compiled into or comprise a software product / computer program product, wherein one or more computer-executable instructions, when executed by a processor, perform the steps of the various functions and / or methods in the embodiments described herein.

[0081] Example 9

[0082] Based on the above embodiments, this embodiment provides an application example.

[0083] This invention relates to a device and method for measuring the magnetic field immunity of a trackside axle counter in the field of rail transit. It is mainly used to measure the magnetic field immunity of the axle counter before it leaves the factory and is used. The measured immunity index will serve as an important reference for subsequent evaluation of the electromagnetic compatibility between locomotives and axle counters.

[0084] Axle counters are an important component of rail transit train detection systems, serving as safety devices to detect track occupancy / vacancy. The sensing devices in axle counters are primarily electromagnetic induction type. They count axles by installing sensors beside the track to detect changes in the magnetic field before and after the vehicle wheels pass. Therefore, axle counters are magnetically sensitive devices and are susceptible to magnetic field interference from high-power frequency converters (four-quadrant converters, traction inverters, choppers, etc.) on locomotives and rolling stock during operation.

[0085] To address the risk of interference from locomotives and rolling stock to trackside axle counters, both domestically and internationally, locomotives and rolling stock must undergo electromagnetic compatibility (EMC) regulatory certification testing with the axle counters on the line before being put into formal operation. This involves measuring whether the magnetic field emitted by the locomotives and rolling stock meets the magnetic field immunity requirements of the axle counters. However, this is EMI control from the perspective of the locomotive, not EMC control from the perspective of the axle counter.

[0086] Currently, most axle counters used on urban rail lines and main railway lines in China are still imported. The magnetic field immunity index of axle counters can be obtained by referring to the relevant standards issued by the European Electrotechnical Commission (such as CLC / TS 50238-3). Therefore, there is no problem of missing immunity reference index when locomotives and rolling stock are tested for electromagnetic compatibility with foreign axle counter models.

[0087] However, with the accelerated application of domestically produced axle counters, more and more domestically produced axle counters are being used on domestic railway lines. Due to the lack of measurement devices and methods for the magnetic field immunity index of axle counters, it is often impossible to effectively assess whether locomotives and rolling stock will interfere with the axle counters during electromagnetic compatibility certification testing of locomotives and rolling stock and domestically produced axle counters. This could lead to a series of safety hazards after the vehicles are put into operation. There is a technical problem in this field that makes it difficult to assess the immunity of axle counters.

[0088] The measuring device and method of this invention are used to measure the magnetic field immunity index of an axle counter. Specifically, using an interference signal generator, interference injection antenna, interference measurement antenna, digital sampling equipment, etc., under laboratory conditions, the sensitivity of the axle counter to magnetic field signals of different frequencies, amplitudes, and durations is measured, ultimately yielding the axle counter's immunity thresholds to magnetic field frequency, amplitude, and duration. These index limits will serve as a reference in the electromagnetic compatibility assessment process between locomotives and rolling stock and the axle counter.

[0089] The lack of immunity indicators for domestically produced axle counters to continuous magnetic fields has resulted in a lack of reference limits for axle counter magnetic field immunity during electromagnetic compatibility (EMC) measurements between locomotives and rolling stock. This embodiment designs a measurement device and method capable of measuring the immunity thresholds of axle counters to continuous magnetic fields of different directions, frequencies, and amplitudes. This embodiment fills the gap in the magnetic field immunity indicators for domestically produced axle counters and those not included in the standards, providing clear limit reference indicators for EMC certification measurements between locomotives and rolling stock, and reducing the safety risks after vehicles are officially put into operation.

[0090] The lack of immunity indicators for intermittent magnetic fields in domestically produced axle counters means that the magnetic field emission data of locomotives and rolling stock lacks an integration time parameter reference during digital signal processing in electromagnetic compatibility (EMC) measurements between locomotives and axle counters. This embodiment designs a measurement device and method capable of measuring the immunity threshold of axle counters to intermittent magnetic fields, and further obtaining the integration time. This embodiment fills the gap in magnetic field immunity indicators for domestically produced axle counters and those not included in the standard, providing a clear reference for digital signal processing parameters during EMC certification measurements of locomotives and rolling stock and axle counters.

[0091] The lack of filtering amplitude-frequency response parameters in domestically produced axle counters means that the magnetic field emission data of locomotives and axle counters lacks reference for digital filtering parameters (bandwidth, filter type, order, etc.) in digital signal processing during the electromagnetic compatibility (EMC) measurement of locomotives and axle counters. This embodiment designs a measurement device and method capable of measuring the filtering amplitude-frequency response curve at the axle counter receiver. This embodiment fills the gap in magnetic field immunity parameters for domestically produced axle counters and those not included in the standard, providing clear digital signal processing parameter references during the EMC certification measurement of locomotives and axle counters.

[0092] The axle counter sensor is installed on a track of a predetermined length (e.g., 1m or more). The track type should ensure the worst possible magnetic field immunity of the axle counter; if the track type is uncertain, testing should be conducted on all track types. Ensure there is no metal within a 0.8m radius around the axle counter sensor. The axle counter sensor is connected to the axle counter detection circuit. During the test, the axle counter operates normally. The status changes of the output signal of the axle counter detection circuit are monitored using an oscilloscope, as follows: Figure 4 As shown, the magnetic field injection antenna (injection unit) is connected to a signal generator and a power amplifier to generate continuous or intermittent sinusoidal interference signals with adjustable frequency and amplitude. During the experiment, the magnetic field injection antenna rotates around an axis based on a coordinate plane (e.g., the XZ and YZ planes) centered on the axis-counting sensor to generate interference magnetic fields in different directions. The most sensitive angle α of the magnetic field injection antenna is determined during the rotation. ms During rotation in the YZ plane, the distance between the center point of the magnetic field injection antenna and the center point of the axle counter sensor is maintained at a preset distance, for example, 30cm, to ensure magnetic field uniformity. Connect the current loop and the measuring antenna (measuring unit) to the spectrum analyzer to monitor the current of the magnetic field injection antenna and the interfering magnetic fields in the X, Y, and Z directions at the location of the axle counter sensor. The axle counter sensor on the rail should be removed when using the measuring antenna. The connection of the measuring device is as follows: Figures 5-8 As shown.

[0093] The electrical parameters of the magnetic field injection antenna in the measuring device are as follows:

[0094] Figure 9 This is a schematic diagram of a magnetic field injection antenna provided in an embodiment of this application. The magnetic field injection antenna is a square loop antenna with two windings, and the antenna side length reaches 55cm to achieve good magnetic field uniformity, as shown below. Figure 9 As shown, within a range of 300mm from the center of the antenna, the magnetic field uniformity is less than a preset magnetic field threshold, for example, 1.6dB. From the inside out, the range is: 100mm×100mm (0.3dB range); 200mm×200mm (1dB range); 300mm×300mm (1.6dB range).

[0095] The electrical parameters of the measuring antenna in the measuring device are as follows:

[0096] The measuring antenna is a triaxial magnetic field antenna used to measure the magnitude of the magnetic field in the X, Y, and Z directions at the mounting location of the axis counter sensor, as follows: Figure 10 As shown in Table 1, the antennas are divided into high-frequency magnetic field antennas and low-frequency magnetic field antennas based on the measurement frequency band.

[0097] Table 1. Magnetic Field Immunity Index of Shaft Counter

[0098] type Test bandwidth X-coil size Y and Z coil dimensions Number of turns High-frequency magnetic field antenna 100~1300kHz 50*50mm 150*150mm 24 turns Low-frequency magnetic field antenna 10~100kHz 50*50mm 150*150mm 40 turns

[0099] The method for determining the measurement of the shaft counter's immunity to a continuous magnetic field is as follows:

[0100] For continuous magnetic field immunity measurements, a continuous sine wave is used as the test signal. The frequency of the test signal is adjusted within the known operating frequency range of the shaft counter to establish the actual immunity frequency range.

[0101] Determine the continuous magnetic field immunity in the XZ and YZ planes using the following steps.

[0102] a) Set the frequency of the signal generator to the most sensitive frequency f of the axis counter sensor. Gen .

[0103] b) Install the magnetic field injection antenna in the following location:

[0104] 1) At the position where angle α = 0° in the XZ plane (the direction of magnetic field emission is the X direction, see...) Figure 5 and Figure 6 );

[0105] 2) At the position where angle α = 0° in the YZ plane (the magnetic field emission direction is the Y direction, see...) Figure 7 and Figure 8 );

[0106] 3) At the position where the angle α = 90° in the YZ plane (the magnetic field emission direction is the Z direction, see...) Figure 7 ).

[0107] Gradually increase the output amplitude of the interference signal from the signal generator until it exceeds the immunity threshold of the axle counter, i.e., the axle counter detection circuit outputs one or more interference pulses. See [link to relevant documentation]. Figure 4 Record the current amplitude of the magnetic field injected into the antenna when the immunity threshold is exceeded at each installation location.

[0108] c) Find the most sensitive angle α of the magnetic field injection antenna in the YZ plane. ms ,See Figure 7 The minimum current amplitude corresponding to the magnetic field injection antenna is α, with a step of 10°.

[0109] d) Replace the axis counting sensor with a measuring antenna. Referring to step b, set the same magnetic field injection antenna position and magnetic field injection antenna current amplitude, and record the magnetic field measured by the measuring antenna in each direction, as shown below:

[0110] 1) Record the magnetic field in the X direction at the position where the angle α = 0° in the XZ plane;

[0111] 2) Record the magnetic field in the Y direction at the position where the angle α = 0° in the YZ plane;

[0112] 3) Record the magnetic field in the Z direction at a position where the angle α = 90° in the YZ plane.

[0113] e) If the most sensitive angle in step c) is within the preset angle range (20° < α) ms If the angle is <70°, then the measured value in step d) is corrected as follows:

[0114] 1) Y direction: H y，correct (α ms )=H y +20·log(cos(α ms [dBuA / m];

[0115] 2) Z direction: H z，correct (α ms )=H z +20·log(sin(α ms ))[dBuA / m].

[0116] The method for determining the immunity of the shaft counter to intermittent magnetic fields is as follows:

[0117] For intermittent magnetic field immunity testing, an intermittent sine wave is used as the test signal. The response of the shaft counter to intermittent sinusoidal interference is as follows: Figure 11 As shown:

[0118] illustrate:

[0119] H(t) – Test signal, in microamperes per meter (μA / m);

[0120] v(t) — Detected signal, in millivolts (mV);

[0121] L(t) — Shaft counter status (normal or faulty);

[0122] T Rep —Repetition interval, in milliseconds (ms);

[0123] T D — Duration of interference, in milliseconds (ms);

[0124] T1.0 —System response time, negative half-wave, in milliseconds (ms);

[0125] U x —Equipment threshold value, in millivolts (mV).

[0126] Determine the immunity of the shaft counter to intermittent magnetic field interference using the following steps.

[0127] a) Select the injection plane (XZ plane or YZ plane) for the magnetic field injection antenna; to use a lower interfering magnetic field strength, mount the magnetic field injection antenna on the YZ plane, placing it at the most sensitive measurement angle α. ms ,See Figure 7 .

[0128] b) Set the signal generator frequency to the frequency that the shaft counter is most sensitive to. Gen .

[0129] c) If the time for the system to recover from the transient signal state is uncertain, set T. Rep Not less than 0.5s.

[0130] d) T D Set the most sensitive frequency f of the axis counter detector Gen A period T Gen .

[0131] e) Gradually increase the amplitude of the interference signal output from the signal generator until it exceeds the immunity threshold of the axle counter, i.e., the axle counter detection circuit outputs one or more interference pulses, see [link to relevant documentation]. Figure 4 .

[0132] f) Record the interference threshold and T on the X-axis, Y-axis, and Z-axis at this time. D Determine the interference threshold - duration T in the most sensitive direction. D The curve, see Figure 12 Since the vertical axis of the curve is in dB, the magnetic field injection antenna current, which is in dBmA, can be used to record the threshold instead of measuring the magnetic field interference threshold.

[0133] g) Increase T D Then return to step e). T D It is advisable to follow the step size T Gen Increase by multiplying by 2n (n = 0, 1, 2, ...).

[0134] h) Repeat steps e) to g) until a measurement curve of the shaft counter's immunity versus the duration of the disturbance can be plotted, see... Figure 12 The curve shows the response of the axle counter's magnetic field immunity to the duration of intermittent disturbances. The integral time T of the axle counter... iThe cutoff point of the linear interpolation line of the measurement results relative to the X-axis is determined. When the duration of the disturbance is less than T... i When the disturbance duration is greater than T, the immunity of the shaft counter increases as the disturbance duration decreases. i After that, the immunity of the axis counter detector basically no longer changes and is equal to the immunity under continuous interference.

[0135] The method for measuring the amplitude-frequency response curve of the axle counter filter is as follows:

[0136] Choose the injection plane (XZ plane or YZ plane) for the magnetic field injection antenna; to use a lower interfering magnetic field strength, the magnetic field injection antenna should preferably be mounted on the YZ plane, placing it at the most sensitive measurement angle α. ms ,See Figure 7 .

[0137] A continuous sine wave is used as the test signal, and the signal frequency varies within a -20dB bandwidth of the shaft counter's operating range.

[0138] The magnetic field immunity in the X, Y, or Z directions at the most sensitive angle is recorded as a function of frequency, and the filter amplitude-frequency response curve is plotted, including 0dB, -3dB, and -20dB points.

[0139] See the example of the measured filter amplitude-frequency response curve. Figure 13 The filter measurement curve of this shaft counter is almost identical to the amplitude-frequency response characteristics of an LC Butterworth bandpass filter.

[0140] The magnetic field immunity index of the shaft counter is determined based on the measurement results obtained from the above measuring devices and methods. The measurement results include:

[0141] a) Measurement results of continuous field immunity:

[0142] X-direction magnetic field immunity limit (rms), in dBuA / m;

[0143] Y-direction magnetic field immunity limit (rms), in dBuA / m;

[0144] Z-direction magnetic field immunity limit (rms), in dBuA / m;

[0145] The above magnetic field immunity limits in the X, Y, and Z directions have been based on the most sensitive angle α. ms Corrections have been made.

[0146] b) Measurement results of intermittent immunity:

[0147] Record the interference threshold and interference duration T on the X, Y, and Z axes. D , drawn into Figure 12The curve shown allows us to obtain the integration time T. i .

[0148] c) Measurement results of the amplitude-frequency response of the shaft counter filter:

[0149] The immunity in the X, Y, or Z directions at the most sensitive angle is recorded as a function of frequency to plot the filter's amplitude-frequency response curve, see... Figure 13 This includes 0dB, -3dB, and -20dB points.

[0150] The measurement results above are recorded in a table for each measured shaft gauge, as shown in the table below.

[0151] Table 2. Magnetic field immunity index of the shaft counter

[0152]

[0153] In the measuring device of the present invention, the signal generator, power amplifier and monitoring system can all be replaced. It is only necessary to ensure that the signal generator can generate a continuous / intermittent sine wave with adjustable frequency and amplitude, that the power amplifier can amplify the interference signal to a certain strength sufficient to interfere with the shaft counter, and that the monitoring system can monitor the state changes of the output channel of the shaft counter detection circuit.

[0154] In the measuring device of this invention, the interference injection antenna and the measuring antenna have a significant impact on the applicability of the measuring device. The selection of the antenna electrical parameters in this invention is an optimized choice after comparing a large number of schemes, and this patent should protect these parameters (such as the antenna's structural dimensions, number of turns, etc.). However, these parameters are not irreplaceable, and it is possible to achieve the measuring effect of this device by selecting other parameter combinations.

[0155] The measurement method involved in this invention includes the connection of the entire measuring device, the measurement steps, and the data conversion method (magnetic field immunity limits in the X, Y, and Z directions and the most sensitive angle α). ms The conversion formula, the method of obtaining the integration time, and the method of obtaining the filter amplitude-frequency curve are all better choices, and this patent should protect these methods.

[0156] In the field of electromagnetic compatibility (EMC) measurement between locomotives and axle counters, relevant technologies focus on the locomotive's magnetic field emission. Different measurement hardware and software algorithms are designed to measure the magnitude of magnetic field interference caused by the locomotive at the trackside axle counter location. This is then compared with the magnetic field immunity limits for relevant axle counter models already included in the standards to determine whether the locomotive will cause magnetic field interference to the trackside axle counter during operation. The premise for this measurement and evaluation process is that the magnetic field immunity limits for the axle counter are clearly defined. However, with the widespread application of axle counters, many new foreign and domestic axle counter models have emerged. The magnetic field immunity indicators for these axle counters are not included in existing standards, resulting in a lack of reference indicators for EMC measurement between locomotives and these axle counter models, thus hindering effective certification testing. This invention focuses on the magnetic field immunity of axle counters. It designs a measuring device and method to measure and obtain the magnetic field immunity index of axle counters. This not only fills the gaps in these important axle counter indicators and accelerates the application and replacement of domestically produced axle counters, but also provides an important reference for subsequent electromagnetic compatibility certification testing of locomotives and rolling stock with axle counters, improving the safety of train inspection systems. Regarding the electromagnetic compatibility measurement of locomotives and rolling stock with axle counters, existing magnetic field immunity indicators for axle counters can be found in Appendix A of European CLC / TS 50238-3-2022.

[0157] In the embodiments provided by this invention, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0158] It should be noted that, in this invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element limited by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0159] While the embodiments disclosed in this invention are as described above, the above content is merely for the purpose of facilitating understanding of this invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope disclosed in this invention; however, the scope of patent protection of this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A shaft counter immunity testing system, characterized in that, include: The measuring unit, mounted on the track, is used to measure the amplitude and frequency of interference signals; The injection unit is configured to rotate around the measurement unit and emit interference signals in different directions.

2. The shaft counter immunity testing system according to claim 1, characterized in that, The measurement unit includes a measurement antenna or an axis counter, wherein the measurement antenna includes a triaxial magnetic field antenna, and the triaxial magnetic field antenna includes a high-frequency antenna and a low-frequency antenna.

3. The shaft counter immunity testing system according to claim 1, characterized in that, The injection unit includes: an injection antenna; Within a preset distance from the center point of the injected antenna, the uniformity of the magnetic field is less than a preset magnetic field threshold. When the injection antenna rotates around the measurement unit, the distance between the injection antenna and the center point of the measurement unit is a preset distance.

4. A method for testing the immunity of a shaft counter based on the shaft counter immunity testing system according to any one of claims 1 to 3, characterized in that, The method includes: Set the measuring unit to a shaft counter; Set the frequency of the interference signal to the most sensitive frequency of the shaft counter; Set the injection unit to a preset position and gradually increase the amplitude of the interference signal until the shaft counter outputs a pulse; Record the correspondence between the preset position and the current amplitude of the interference signal.

5. The method for testing the immunity of a shaft counter according to claim 4, characterized in that, The method further includes: Configure the measurement unit as a measurement antenna; Record the magnetic field strength measured by the measuring antenna at a preset position and under the action of corresponding interference signals; When the most sensitive angle of the injection unit is within the preset angle range, the magnetic field strength is corrected.

6. The method for testing the immunity of a shaft counter according to claim 4, characterized in that, The method further includes: Plot the immunity-interference duration curve of the shaft counter; and / or Plot the filter amplitude-frequency response curve of the axle counter.

7. A shaft counter immunity testing device based on the shaft counter immunity testing system according to any one of claims 1 to 3, characterized in that, The device includes: The first setting module is used to set the measuring unit as a shaft counter; The second setting module is used to set the frequency of the interference signal to the most sensitive frequency of the shaft counter. The control module is used to set the injection unit to a preset position and gradually increase the amplitude of the interference signal until the shaft counter outputs a pulse; The recording module is used to record the correspondence between the preset position and the current amplitude of the interference signal.

8. A computer device, comprising a memory, a processor, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement the steps of the axle counter immunity test method according to any one of claims 4 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the shaft counter immunity test method according to any one of claims 4 to 6.

10. A computer program product, comprising a computer program, characterized in that, When executed by a processor, the computer program implements the steps of the shaft counter immunity test method according to any one of claims 4 to 6.

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