Method and system for testing and inspecting speed sensor of rail transit

Abstract

The invention relates to a rail transit speed sensor test and inspection method and system. The method comprises the following steps: acquiring a to-be-tested speed sensor; the input end of the speed sensor is connected to a signal system, the output end of the speed sensor is connected to sensor test verification equipment, and the signal system is used for providing an input control signal for the speed sensor; the sensor test verification device is used for providing rotating speed for the speed sensor, receiving output electrical performance parameters of the speed sensor and supplying power to the speed sensor. And determining input parameters of the signal system and the sensor testing and checking equipment, driving the speed sensor to operate, and checking the performance of the speed sensor according to the received output electrical performance parameters. Compared with the prior art, the system can simulate the running state and the test scene of a vehicle wheel set, and has indoor and outdoor test capabilities and a comprehensive troubleshooting function.

Description

Technical Field

[0001] This invention relates to the field of speed sensor testing technology, and in particular to a method and system for testing and verifying speed sensors in rail transit. Background Technology

[0002] Currently, after the speed and distance measurement unit (speed sensor) of the rail transit signaling system is disassembled, the product is taken to the laboratory for inspection and testing. Only the electrical performance parameters of the speed sensor can be tested, such as the main parameters like duty cycle, high and low voltage levels, and phase difference. Simply testing these electrical performance parameters does not fully resolve the actual fault phenomena observed in the field.

[0003] Current test benches can only verify and test the electrical performance of speed sensors in the laboratory. Often, when the speed sensor is reinstalled on a vehicle, the same fault symptoms appear, making it impossible to truly pinpoint the cause of the problem. For example:

[0004] a) Whether there is a break in the link between the speed sensor and the signal system;

[0005] b) Check if the connector pins have been retracted;

[0006] c) Wheels spin and slip;

[0007] d) Environmental interference (including vehicle-mounted and trackside). Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the existing technology, which currently only allows testing and detection of the electrical performance of speed sensors in the laboratory. Often, the speed sensor will still exhibit the same fault phenomenon when it is reinstalled on the vehicle, making it impossible to truly find the cause of the fault. Therefore, this invention provides a method and system for testing and inspecting speed sensors in rail transit.

[0009] The objective of this invention can be achieved through the following technical solutions:

[0010] A method for testing and verifying speed sensors in rail transit includes the following steps:

[0011] Acquire the speed sensor to be tested;

[0012] The input end of the speed sensor is connected to a signal system, and the output end is connected to a sensor testing and verification device. The signal system is used to provide input control signals to the speed sensor; the sensor testing and verification device is used to provide rotational speed to the speed sensor, receive the output electrical performance parameters of the speed sensor, and supply power to the speed sensor.

[0013] The input parameters of the signal system and sensor testing and verification equipment are determined, the speed sensor is driven to operate, and the performance of the speed sensor is verified based on the received output electrical performance parameters.

[0014] Furthermore, the sensor testing and verification equipment includes:

[0015] The motor, connected to the controller, is used to simulate the rotational state of the locomotive wheelsets to drive the speed sensor;

[0016] The conversion board is used to acquire and compare the electrical signals from the various channels inside the speed sensor;

[0017] A board-type oscilloscope is used to acquire the electrical signals and waveforms output from the speed sensor on the conversion board;

[0018] The computer is used to analyze the electrical signals and waveforms output by the board-type oscilloscope to determine whether the speed sensor is working properly, whether there is a broken link, whether the connector pins are retracted, whether the wheelset is spinning or slipping, and whether there is environmental interference.

[0019] The power board is used to provide power to the sensor testing and calibration equipment.

[0020] Furthermore, the sensor testing and verification equipment also includes:

[0021] Storage batteries are used to power the power board.

[0022] Furthermore, the computer determines whether there is a break in the link between the speed sensor and the signal system based on the electrical signal and waveform output by the board-type oscilloscope. The specific determination process is as follows:

[0023] After powering on the signal system and sensor testing and verification equipment, the motor in the sensor testing and verification equipment is driven to rotate, thereby driving the corresponding speed sensor;

[0024] Determine if the output waveform of the board-type oscilloscope is a constant low level. If it is, analyze the electrical signal output by the board-type oscilloscope using a computer to see if there is no signal output. If so, determine if there is a break in the link between the speed sensor and the signal system.

[0025] Furthermore, the process by which the computer determines whether the connector pins have retracted based on the electrical signals and waveforms output by the board-type oscilloscope is as follows:

[0026] After powering on the signal system and sensor testing and verification equipment, the motor in the sensor testing and verification equipment is driven to rotate, thereby driving the corresponding speed sensor;

[0027] The computer analyzes the electrical signals output by the board-type oscilloscope to determine if there is no signal output. If not, it judges the abnormal information output. If there is an increase in the difference between the number of signal pulses and the phase difference between channels exceeds the tolerance, it is determined that the connector pins have retracted.

[0028] Furthermore, the computer determines the wheel slippage process based on the electrical signals and waveforms output by the board-type oscilloscope as follows:

[0029] After powering on the signal system and sensor testing and verification equipment, the motor in the sensor testing and verification equipment is driven to rotate, thereby driving the corresponding speed sensor;

[0030] The computer makes anomaly judgments based on the electrical signals output by the board-type oscilloscope. If there are sudden changes in the difference between the number of pulses in the signal and the phase difference between channels exceeds the tolerance, and the speed measurement value output by the speed sensor fluctuates beyond the allowable error range in a short period of time, then it is judged that there is wheel slippage.

[0031] Furthermore, the process by which the computer determines environmental interference based on the electrical signals and waveforms output by the board-type oscilloscope is as follows:

[0032] After powering on the signal system and sensor testing and verification equipment, the motor in the sensor testing and verification equipment is driven to rotate, thereby driving the corresponding speed sensor;

[0033] Anomalies are detected by computer based on the electrical signals output by the board-type oscilloscope. If there is a sudden change in the pulse count between one or two channels, or if there is an excessive phase difference between channels; if the output signal waveform of the oscilloscope has abnormal noise and interference; and if the speed measurement value output by the speed sensor fluctuates beyond the allowable error range in a short period of time, then environmental interference is detected.

[0034] The present invention also provides a speed sensor testing and inspection system for realizing the speed sensor testing and inspection of rail transit as described above, comprising:

[0035] The speed sensor to be tested;

[0036] A signal system is used to connect to the input terminal of the speed sensor and provide input control signals to the speed sensor;

[0037] The sensor testing and verification equipment is used to connect to the output terminal of the speed sensor, provide rotational speed to the speed sensor, receive the output electrical performance parameters of the speed sensor, supply power to the speed sensor, and perform performance verification of the speed sensor based on the received output electrical performance parameters.

[0038] Furthermore, the sensor testing and verification equipment includes:

[0039] The motor, connected to the controller, is used to simulate the rotational state of the locomotive wheelsets to drive the speed sensor;

[0040] The conversion board is used to acquire and compare the electrical signals from the various channels inside the speed sensor;

[0041] A board-type oscilloscope is used to acquire the electrical signals and waveforms output from the speed sensor on the conversion board;

[0042] The computer is used to analyze the electrical signals and waveforms output by the board-type oscilloscope to determine whether the speed sensor is working properly, whether there is a broken link, whether the connector pins are retracted, whether the wheelset is spinning or slipping, and whether there is environmental interference.

[0043] The power board is used to provide power to the sensor testing and calibration equipment.

[0044] Furthermore, the sensor testing and verification equipment also includes:

[0045] Storage batteries are used to power the power board.

[0046] Compared with the prior art, the present invention has the following advantages:

[0047] (1) This invention connects the speed sensor to the signal system and the sensor test and verification equipment to perform joint testing of the speed sensor. It can simulate the vehicle wheelset running state and test scenarios, and provide the signal system with multi-scenario test functions. It also has indoor and outdoor testing capabilities, which traditional test benches cannot achieve outdoor testing functions. The external portable battery can provide power to the verification equipment for more than 2 hours.

[0048] (2) This invention provides a fault diagnosis function for speed sensors. Traditional test benches can only test whether the electrical performance of the speed sensor is normal, and cannot perform link testing between the speed sensor and the signal system. This invention enables checking the link test between the speed sensor and the signal system to determine whether there is a broken wire, as well as determining whether the aircraft plug pin is retracted, determining wheel slippage, and determining environmental interference and other faults. Attached Figure Description

[0049] Figure 1 This is a flowchart illustrating a speed sensor testing and verification method for rail transit provided in an embodiment of the present invention.

[0050] Figure 2 This is a schematic diagram of the structure of a sensor testing and verification device provided in an embodiment of the present invention;

[0051] Figure 3 This is a schematic diagram illustrating a joint test of a signal system and a verification device provided in an embodiment of the present invention;

[0052] Figure 4 This is a schematic diagram of a calibration device test provided in an embodiment of the present invention. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0054] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0055] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0056] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0057] It should be noted that the term "speed sensor" is available in single, dual, triple, and quadruple output options. By scanning the inner and outer tracks of the grating, the sensor can output two square wave signals with different pulse counts: 80 pulses per revolution for the inner track and 200 pulses per revolution for the outer track. The output can be various combinations of different pulse counts. Each channel is isolated from the others and features polarity protection and output short-circuit protection. The sensor can be easily mounted on the axle box cover. The transmission part uses a flexible connection to overcome installation misalignment and drive clearance. The DF16 sensor is characterized by its robustness, sealing, shock resistance, impact resistance, wide speed measurement range, wide temperature adaptability, high reliability, and long service life. It is suitable for various types of locomotives both domestically and internationally for speed, direction, idle speed, and slippage detection.

[0058] The term "board-type oscilloscope" refers to an electronic measuring instrument that utilizes the characteristics of an oscilloscope tube to convert alternating electrical signals, which are invisible to the human eye, into images displayed on a fluorescent screen for measurement. It is an indispensable instrument for observing phenomena in digital circuit experiments, analyzing problems in experiments, and measuring experimental results. An oscilloscope consists of an oscilloscope tube and power supply system, synchronization system, X-axis deflection system, Y-axis deflection system, delay scan system, and a standard signal source.

[0059] Example 1

[0060] like Figure 1 As shown, this embodiment provides a test and inspection method for speed sensors in rail transit, including the following steps:

[0061] S1: Acquire the speed sensor to be tested;

[0062] S2: Connect the input end of the speed sensor to the signal system and the output end to the sensor testing and verification equipment. The signal system is used to provide input control signals to the speed sensor; the sensor testing and verification equipment is used to provide the rotational speed to the speed sensor, receive the output electrical performance parameters of the speed sensor, and supply power to the speed sensor.

[0063] S3: Determine the input parameters of the signal system and sensor test and verification equipment, drive the speed sensor to run, and perform performance verification of the speed sensor based on the received output electrical performance parameters.

[0064] Specifically, sensor testing and calibration equipment includes:

[0065] The motor, connected to the controller, is used to simulate the rotational state of the locomotive wheelsets to drive the speed sensor;

[0066] Specifically, the motor is a servo motor, and the output end of the servo motor is connected to the train wheel axle drive to simulate the train wheel axle running conditions, thereby driving the speed sensor;

[0067] The conversion board is used to acquire and compare the electrical signals from the various channels inside the speed sensor;

[0068] A board-type oscilloscope is used to acquire the electrical signals and waveforms output from the speed sensor on the conversion board;

[0069] The computer is used to analyze the electrical signals and waveforms output by the board-type oscilloscope to determine whether the speed sensor is working properly, whether there is a broken link, whether the connector pins are retracted, whether the wheelset is spinning or slipping, and whether there is environmental interference.

[0070] The power board is used to provide power to the sensor testing and calibration equipment.

[0071] Optionally, the sensor testing and calibration equipment may also include:

[0072] Storage batteries are used to power the power board.

[0073] The preferred computer is a portable laptop with built-in testing software.

[0074] like Figure 2 The diagram shows the integrated structure of the sensor testing and verification equipment. The front of the sensor testing and verification equipment has a circular channel for the train wheel axle to extend into in order to connect to the motor. All other components are encapsulated inside the housing of the sensor testing and verification equipment.

[0075] The above solution can achieve the following testing process:

[0076] 1) Joint testing of signal system and calibration equipment

[0077] Turn on the signal system and portable speed sensor test and calibration equipment, and determine the basic parameters (see Table 1 below); if there is no external AC220V power supply, use the battery to power the portable calibration equipment.

[0078] Table 1

[0079]

[0080] Open your laptop and double-click the test software to open it;

[0081] Input the parameters from Table 1 above, and start the internal motor of the testing equipment to provide rotational speed to the speed sensor.

[0082] The software determines whether the output electrical performance parameters of the speed sensor are qualified (see Table 2), and at the same time uses an internal oscilloscope to check whether there are broken wires, interference and other problems in the speed sensor, the on-board cable and the signal system.

[0083] Table 2 Output Electrical Performance Parameters of the Velocity Sensor

[0084]

[0085] The specific process for determining whether there is a break in the link between the speed sensor and the signal system is as follows:

[0086] 1) Power on the signal system and test bench;

[0087] 2) The motor inside the test bench rotates;

[0088] 3) Is the oscilloscope waveform a constant low level?

[0089] 4) The test software analysis showed no signal output.

[0090] That is, after the signal system and sensor testing and verification equipment are powered on, the motor in the sensor testing and verification equipment is driven to rotate, so as to drive the corresponding speed sensor;

[0091] Determine if the output waveform of the board-type oscilloscope is a constant low level. If it is, analyze the electrical signal output by the board-type oscilloscope using a computer to determine if there is no signal output. If so, determine if there is a break in the link between the speed sensor and the signal system.

[0092] The specific process for determining whether the connector pins have retracted is as follows:

[0093] 1) Power on the signal system and test bench;

[0094] 2) The motor inside the test bench rotates;

[0095] 3) The test software analysis showed no signal output.

[0096] 4) The test software analyzes abnormal signal output, such as increased difference between pulse numbers and excessive phase difference between channels.

[0097] That is, after the signal system and sensor testing and verification equipment are powered on, the motor in the sensor testing and verification equipment is driven to rotate, so as to drive the corresponding speed sensor;

[0098] The computer analyzes the electrical signals output by the board-type oscilloscope to determine if there is no signal output. If not, it judges the abnormal information output. If there is an increase in the difference between the number of signal pulses and the phase difference between channels exceeds the tolerance, it is determined that the connector pins have retracted.

[0099] The specific process of determining whether the wheelset is spinning or slipping is as follows:

[0100] 1) Power on the signal system and test bench;

[0101] 2) The motor inside the test bench rotates;

[0102] 3) The test software analyzes abnormal signal output, with sudden changes in the difference between pulse numbers and excessive phase difference between channels;

[0103] 4) Speed ​​change exceeds tolerance.

[0104] That is, after the signal system and sensor testing and verification equipment are powered on, the motor in the sensor testing and verification equipment is driven to rotate, so as to drive the corresponding speed sensor;

[0105] The computer makes anomaly judgments based on the electrical signals output by the board-type oscilloscope. If there are sudden changes in the difference between the number of pulses in the signal and the phase difference between channels exceeds the tolerance, and the speed measurement value output by the speed sensor fluctuates beyond the allowable error range in a short period of time, then it is judged that there is wheel slippage.

[0106] The process of determining environmental interference is as follows:

[0107] 1) Power on the signal system and test bench;

[0108] 2) The motor inside the test bench rotates;

[0109] 3) The test software analyzes abnormal signal output, such as sudden changes in the pulse count between one or two channels, or excessive phase difference between channels;

[0110] 4) Use an oscilloscope to detect abnormal signal waveform noise and interference;

[0111] 5) Speed ​​change exceeds tolerance.

[0112] That is, after the signal system and sensor testing and verification equipment are powered on, the motor in the sensor testing and verification equipment is driven to rotate, so as to drive the corresponding speed sensor;

[0113] Anomalies are detected by computer based on the electrical signals output by the board-type oscilloscope. If there is a sudden change in the pulse count between one or two channels, or if there is an excessive phase difference between channels; if the output signal waveform of the oscilloscope has abnormal noise and interference; and if the speed measurement value output by the speed sensor fluctuates beyond the allowable error range in a short period of time, then environmental interference is detected.

[0114] like Figure 3 The diagram shows a circuit connection for joint testing of a signal system and calibration equipment. The JZ-5 speed calibration bench is the sensor testing and calibration equipment. One end of the signal system is connected to a laptop computer, and the other end is connected to various speed sensors to be tested. The input end of the JZ-5 speed calibration bench is connected to a laptop computer and a portable power supply, and can also be powered by AC220V.

[0115] The various speed sensors to be measured include:

[0116] A photoelectric sensor, one end of which is connected to a signal system and the other end is mounted on the Z-5 speed calibration bench;

[0117] A Hall sensor, one end of which is connected to the signal system, and the other end is mounted on the Z-5 speed calibration bench via an adapter;

[0118] The coded odometer is connected to the signal system at one end and mounted on the Z-5 speed calibration bench at the other end.

[0119] 2) Verification equipment testing

[0120] Operating steps:

[0121] Power on the portable speed sensor testing and calibration equipment and insert the plug on the speed sensor into the corresponding socket on the equipment. If there is no external AC220V power supply, use the battery to power the portable calibration equipment.

[0122] Open your laptop and double-click the test software to open it;

[0123] Input parameters to start the internal motor of the testing equipment and provide rotational speed to the speed sensor.

[0124] The software determines whether the electrical performance parameters output by the speed sensor are qualified.

[0125] like Figure 4 The diagram shows a circuit connection configuration for testing the calibration equipment. The JZ-5 speed calibration bench is the sensor testing and calibration equipment. The input terminal of the JZ-5 speed calibration bench is connected to a laptop and a portable power supply, and can also be powered by AC220V. Various speed sensors to be tested are installed on the JZ-5 speed calibration bench.

[0126] The various speed sensors to be measured include:

[0127] The photoelectric sensor is mounted on the Z-5 speed calibration platform;

[0128] Hall effect sensor, mounted on Z-5 speed calibration bench via adapter;

[0129] The coded odometer is installed on the Z-5 speed calibration bench.

[0130] Example 2

[0131] This embodiment provides a speed sensor testing and inspection system for rail transit as described in Embodiment 1, comprising:

[0132] The speed sensor to be tested;

[0133] The signal system is used to connect to the input terminal of the speed sensor and provide input control signals to the speed sensor;

[0134] The sensor testing and verification equipment is used to connect to the output terminal of the speed sensor, provide the speed to the speed sensor, receive the output electrical performance parameters of the speed sensor, supply power to the speed sensor, and perform performance verification of the speed sensor based on the received output electrical performance parameters.

[0135] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A method for testing and verifying speed sensors in rail transit, characterized in that, Includes the following steps: Acquire the speed sensor to be tested; The input end of the speed sensor is connected to a signal system, and the output end is connected to a sensor testing and verification device. The signal system is used to provide input control signals to the speed sensor; the sensor testing and verification device is used to provide rotational speed to the speed sensor, receive the output electrical performance parameters of the speed sensor, and supply power to the speed sensor. The input parameters of the signal system and sensor testing and verification equipment are determined, the speed sensor is driven to operate, and the performance of the speed sensor is verified based on the received output electrical performance parameters.

2. The method for testing and verifying speed sensors in rail transit according to claim 1, characterized in that, The sensor testing and verification equipment includes: The motor, connected to the controller, is used to simulate the rotational state of the locomotive wheelsets to drive the speed sensor; The conversion board is used to acquire and compare the electrical signals from the various channels inside the speed sensor; A board-type oscilloscope is used to acquire the electrical signals and waveforms output from the speed sensor on the conversion board; The computer is used to analyze the electrical signals and waveforms output by the board-type oscilloscope to determine whether the speed sensor is working properly, whether there is a broken link, whether the connector pins are retracted, whether the wheelset is spinning or slipping, and whether there is environmental interference. The power board is used to provide power to the sensor testing and calibration equipment.

3. The method for testing and verifying speed sensors in rail transit according to claim 2, characterized in that, The sensor testing and verification equipment also includes: Storage batteries are used to power the power board.

4. The method for testing and verifying speed sensors in rail transit according to claim 2, characterized in that, The computer determines whether there is a break in the link between the speed sensor and the signal system based on the electrical signal and waveform output by the board-type oscilloscope. The specific determination process is as follows: After powering on the signal system and sensor testing and verification equipment, the motor in the sensor testing and verification equipment is driven to rotate, thereby driving the corresponding speed sensor; Determine if the output waveform of the board-type oscilloscope is a constant low level. If it is, analyze the electrical signal output by the board-type oscilloscope using a computer to see if there is no signal output. If so, determine if there is a break in the link between the speed sensor and the signal system.

5. The method for testing and verifying speed sensors in rail transit according to claim 2, characterized in that, The process by which the computer determines whether the connector pins have retracted based on the electrical signals and waveforms output by the board-type oscilloscope is as follows: After powering on the signal system and sensor testing and verification equipment, the motor in the sensor testing and verification equipment is driven to rotate, thereby driving the corresponding speed sensor; The computer analyzes the electrical signals output by the board-type oscilloscope to determine if there is no signal output. If not, it judges the abnormal information output. If there is an increase in the difference between the number of signal pulses and the phase difference between channels exceeds the tolerance, it is determined that the connector pins have retracted.

6. The method for testing and verifying speed sensors in rail transit according to claim 2, characterized in that, The computer determines the wheel slippage process based on the electrical signals and waveforms output by the board-type oscilloscope as follows: After powering on the signal system and sensor testing and verification equipment, the motor in the sensor testing and verification equipment is driven to rotate, thereby driving the corresponding speed sensor; The computer makes anomaly judgments based on the electrical signals output by the board-type oscilloscope. If there are sudden changes in the difference between the number of pulses in the signal and the phase difference between channels exceeds the tolerance, and the speed measurement value output by the speed sensor fluctuates beyond the allowable error range in a short period of time, then it is judged that there is wheel slippage.

7. The method for testing and verifying speed sensors in rail transit according to claim 2, characterized in that, The process by which the computer determines environmental interference based on the electrical signals and waveforms output by the board-type oscilloscope is as follows: After powering on the signal system and sensor testing and verification equipment, the motor in the sensor testing and verification equipment is driven to rotate, thereby driving the corresponding speed sensor; Anomalies are detected by computer based on the electrical signals output by the board-type oscilloscope. If there is a sudden change in the pulse count between one or two channels, or if there is an excessive phase difference between channels; if the output signal waveform of the oscilloscope has abnormal noise and interference; and if the speed measurement value output by the speed sensor fluctuates beyond the allowable error range in a short period of time, then environmental interference is detected.

8. A speed sensor testing and inspection system for rail transit as described in any one of claims 1-7, characterized in that, include: The speed sensor to be tested; A signal system is used to connect to the input terminal of the speed sensor and provide input control signals to the speed sensor; The sensor testing and verification equipment is used to connect to the output terminal of the speed sensor, provide rotational speed to the speed sensor, receive the output electrical performance parameters of the speed sensor, supply power to the speed sensor, and perform performance verification of the speed sensor based on the received output electrical performance parameters.

9. The speed sensor testing and inspection system according to claim 8, characterized in that, The sensor testing and verification equipment includes: The motor, connected to the controller, is used to simulate the rotational state of the locomotive wheelsets to drive the speed sensor; The conversion board is used to acquire and compare the electrical signals from the various channels inside the speed sensor; A board-type oscilloscope is used to acquire the electrical signals and waveforms output from the speed sensor on the conversion board; The computer is used to analyze the electrical signals and waveforms output by the board-type oscilloscope to determine whether the speed sensor is working properly, whether there is a broken link, whether the connector pins are retracted, whether the wheelset is spinning or slipping, and whether there is environmental interference. The power board is used to provide power to the sensor testing and calibration equipment.

10. The speed sensor testing and inspection system according to claim 9, characterized in that, The sensor testing and verification equipment also includes: Storage batteries are used to power the power board.

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