Urban rail train running gear temperature detection system and method

Abstract

The invention relates to an urban rail train running gear temperature detection system and method. The system comprises a train receiving magnetic steel assembly, a speed measuring magnetic steel assembly, an image acquisition device, a control module and a data processing module. Wherein the train receiving magnetic steel assembly is used for detecting the passing of a train; the speed measurement magnetic steel assembly is used for detecting the train speed; the image acquisition device is used for acquiring an infrared image of a train running gear; the control module controls the image acquisition device to acquire an infrared image of a train running gear based on detection information of the train receiving magnetic steel assembly and the speed measurement magnetic steel assembly; and the data processing module is used for processing the infrared image and calculating the temperature of the train running gear. According to the invention, on-line detection of the temperature of the running gear is realized when the train passes, the detection efficiency is greatly improved, the detection range is expanded, and the detection cost can be effectively reduced.

Description

Technical Field

[0001] This invention belongs to the field of rail vehicle technology, and particularly relates to a temperature detection system and method for the running gear of urban rail trains. Background Technology

[0002] The running gear is a critical component of the train. During train operation, components such as the gearbox, motor, and axle box in the running gear generate heat due to the high-speed rotation of their internal parts, causing the surface temperature of the components to rise. When the temperature is within a certain range, it will not threaten the safety of train operation. However, when a malfunction occurs, the surface temperature of the corresponding components will rise sharply. Excessive temperature will cause the components to fail, affecting the safety of train operation.

[0003] In existing technologies, temperature detection of the running gear mainly uses the temperature test paper method. This method involves attaching temperature test paper to the axle box area of ​​the train. The test paper has a series of squares or dots representing different temperatures. When the temperature at a test point exceeds the specified temperature, the corresponding square or dot changes color irreversibly to black or another color. Maintenance personnel use this to determine the highest temperature experienced by the running gear during train operation. This method can only detect the temperature in the area where the test paper is attached, resulting in a small detection range. Furthermore, the test paper needs to be applied manually, and the color of each test paper must be checked manually after each train run, leading to high labor intensity and low detection efficiency. Summary of the Invention

[0004] The purpose of this invention is to solve one of the above-mentioned technical problems and to provide a temperature detection system and method for the running gear of urban rail trains.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A temperature detection system for the running gear of an urban rail train includes: a receiving magnet assembly, a speed measuring magnet assembly, an image acquisition device, a control module, and a data processing module; The receiving magnet assembly is installed inside the train track and is triggered when the train passes by, sending trigger information to the control module. The speed-measuring magnet assembly is installed inside the train track and is triggered when the train passes by, sending trigger information to the control module. The image acquisition device is installed below the train track to acquire infrared images of the train's running gear; The control module is communicatively connected to the receiving magnet assembly, the speed measuring magnet assembly, the image acquisition device, and the data processing module. The control module is configured to control the image acquisition device to acquire infrared images of the train running gear and upload them to the data processing module when the train running gear moves into the image acquisition area of ​​the image acquisition device, based on the trigger information of the receiving magnet assembly and the speed measuring magnet assembly. The data processing module is configured to calculate the temperature of the train running gear based on infrared images of the train running gear acquired by the image acquisition device.

[0006] In some embodiments of the present invention, the distance L1 between the speed measuring magnet assembly and the receiving magnet assembly is greater than the distance L between the two axles of the same running gear of the train. CZ Less than the length L between the two bogies of the train car CX .

[0007] In some embodiments of the present invention, the receiving magnet assembly is at a predetermined time interval t s If the internal trigger is activated twice consecutively, the control module will start, and the image acquisition device will be activated and enter the shooting preparation state through the control module.

[0008] In some embodiments of the present invention, the speed measuring magnet assembly includes two sets of speed measuring magnets, which are arranged and installed inside the train track.

[0009] The control module is configured to, when the train passes the speed-measuring magnet assembly, trigger the signal based on the time interval t between the two sets of speed-measuring magnets. c Calculate the train speed V based on the distance L2 between the two sets of speed-measuring magnets. c : V c =L2 / t c .

[0010] In some embodiments of the present invention, the control module is further configured to base its operation on the calculated train speed V. c The distance L between the image acquisition area of ​​the image acquisition device and the receiving magnet assembly is used to calculate the time t1 for the train running gear to travel to the image acquisition area. t1=L / V c ; Furthermore, based on time t1, the image acquisition device is controlled to acquire multiple infrared images of the train running gear within several predetermined time intervals after the speed measuring magnet component is triggered.

[0011] In some embodiments of the present invention, the control module is further configured to control the image acquisition device at a preset time interval t. s Inside, the infrared image is acquired by triggering the receiving magnet assembly twice as one cycle.

[0012] In some embodiments of the present invention, a counter is further included; The counter is communicatively connected to both the receiving magnet assembly and the control module. Each time the receiving magnet is triggered, the counter increments by 1 and transmits the count to the control module. When the counter reaches a predetermined value, the control module shuts down after a predetermined delay.

[0013] In some embodiments of the present invention, the data processing module is configured to: after receiving an infrared image, extract the highest temperature value in each infrared image as the temperature value of the infrared image, and sort the temperature values ​​of all infrared images in descending order to form a temperature value sequence. Calculate the average of the first m temperature values, and calculate the absolute value of the difference between the first temperature value in the temperature value sequence and the average value; If the absolute value is greater than the set value S, the temperature value is considered to be a falsely measured high temperature value, and the temperature value is removed from the temperature value sequence. After eliminating erroneous high-temperature values, the average value of the first m temperature values ​​in the temperature value sequence and the absolute value of the difference between the first temperature value and the average value are recalculated until the calculated absolute value is less than the set value S. The average value is then determined as the temperature of the train running gear.

[0014] In some embodiments of the present invention, the image acquisition device includes multiple infrared image acquisition units; the multiple infrared image acquisition units are arranged and installed below the train track; The infrared image acquisition unit includes a protective housing and an infrared camera; the infrared camera is installed inside the protective housing, and the protective housing has a lens hole, with the lens of the infrared camera and the lens hole on the same straight line.

[0015] Some embodiments of the present invention further provide a method for detecting the temperature of the running gear of an urban rail train, used to control the above-mentioned temperature detection system for the running gear of an urban rail train, comprising the following steps: The system determines whether a train has passed based on the trigger signal from the receiving magnet assembly. When it is determined that a train is passing, the train speed is calculated based on the trigger information of the speed measuring magnet component, and the time it takes for the train running gear to reach the image acquisition area of ​​the image acquisition device is further calculated. When the train running gear moves into the image acquisition area of ​​the image acquisition device, infrared images of the train running gear are acquired and uploaded to the data processing module; The data processing module calculates the temperature of the train's running gear based on infrared images of the running gear.

[0016] The beneficial effects of this invention are as follows: 1. This invention achieves online temperature detection of components such as the gearbox, motor, and axle box of the running gear when a train passes by by cooperating with the receiving magnet assembly, speed measuring magnet assembly, image acquisition device, control module, and data processing module. This greatly improves detection efficiency, expands the detection range, and effectively reduces detection costs. 2. The data processing module provided by this invention can effectively eliminate false values, reduce detection errors, greatly improve detection accuracy, and ensure the reliability of the output temperature by processing the highest temperature extracted from the infrared image.

[0017] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a temperature detection system for the running gear of an urban rail train. Figure 2 A distance diagram illustrating the receiving magnet assembly, speed measuring magnet assembly, and image acquisition device provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the image acquisition device provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the speed measuring magnet assembly provided in an embodiment of the present invention; Figure 5 A schematic diagram showing the distance between the two sets of velocity-measuring magnets provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the infrared image acquisition unit provided in an embodiment of the present invention; Figure 7 A flowchart illustrating the operation of the detection system provided in this embodiment of the invention; Figure 8 A flowchart of the data processing module provided in this embodiment of the invention; Detailed Implementation To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that the terms “comprising” and “having”, and any variations thereof, are intended to cover 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 process, method, product, or apparatus.

[0021] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0022] The technical solution of the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0023] As attached Figure 1 - Appendix Figure 8 As shown in an illustrative embodiment of a temperature detection system for the running gear of an urban rail train according to the present invention, the detection system includes a receiving magnet assembly, a speed measuring magnet assembly, an image acquisition device, a control module, and a data processing module.

[0024] Among them, such as Figures 1-2 As shown, the receiving magnet assembly is installed inside the train track. The distance between the magnet detection surface of the receiving magnet assembly and the top surface of the rail meets the predetermined clearance requirements to ensure that when the train passes, the lowest point of the wheel flange is within the magnet detection range. The receiving magnet assembly sends trigger information to the control module.

[0025] The speed-measuring magnet assembly is installed inside the train track, along the direction of train travel, after the receiving magnet. The distance between the magnet detection surface of the speed-measuring magnet assembly and the top surface of the rail meets the predetermined clearance requirements to ensure that when the train passes, the lowest point of the wheel flange is within the magnet detection range, and the speed-measuring magnet assembly sends trigger information to the control module.

[0026] The image acquisition device is installed below the train track to collect infrared images of the train's running gear.

[0027] The control module is communicatively connected to the receiving magnet assembly, the speed measuring magnet assembly, the image acquisition device, and the data processing module.

[0028] The control module is configured to determine whether a train has passed based on the trigger information sent by the receiving magnet assembly. When a train is detected to have passed, it calculates the train's running speed and the time it takes for the running gear to reach the image acquisition area of ​​the image acquisition device based on the trigger information sent by the speed measuring magnet assembly. Then, it controls the image acquisition device to acquire infrared images of the train's running gear and upload them to the data processing module at the same time the train's running gear reaches the image acquisition area of ​​the image acquisition device.

[0029] The data processing module is configured to calculate the temperature of the train's running gear based on infrared images of the running gear acquired by the image acquisition device. It should be noted that both the control module and the data processing module are located in the system's control terminal, which is not shown in the figure.

[0030] In the above illustrative embodiment, the cooperation of the receiving magnet assembly, the speed measuring magnet assembly, the image acquisition device, the control module, and the data processing module enables online temperature detection of components such as the gearbox, motor, and axle box of the running gear when the train passes by, which greatly improves detection efficiency, expands the detection range, and effectively reduces detection costs.

[0031] To ensure accurate triggering of the speed-measuring magnet assembly when a train passes, and to avoid false or missed triggering due to insufficient axle spacing, some embodiments of the present invention, such as... Figure 2 As shown, the distance L1 between the speed measuring magnet assembly and the receiving magnet assembly is greater than the distance L between the two axles of the same running gear of the train. CZ Less than the length L between the two bogies of the train car CX .

[0032] To prevent false triggering and save system power consumption, in some embodiments of the present invention, the receiving magnet assembly is activated at a predetermined time interval t. s If the internal trigger is activated twice consecutively, the control module will start and control the image acquisition device to start and enter the shooting preparation state.

[0033] To achieve train speed calculation, in some embodiments of the present invention, such as... Figures 4-5 As shown, the speed measuring magnet assembly includes two sets of speed measuring magnets. Each set of speed measuring magnets includes two speed measuring magnets, namely magnet 1 and magnet 2. The two sets of speed measuring magnets are arranged and installed on the inner side of the train track, and the distance between the two sets of speed measuring magnets is a fixed value L2.

[0034] As the train wheels pass, the two sets of speed-measuring magnets are triggered sequentially, and the control module records the time interval t between the two triggers. c .

[0035] The control module is configured to, when the train passes the speed-measuring magnet assembly, trigger the signal based on the time interval t between the two sets of speed-measuring magnets. cCalculate the train speed V based on the distance L2 between the two sets of speed-measuring magnets. c : V c =L2 / t c .

[0036] In some embodiments of the present invention, the control module is further configured to base its operation on the calculated train speed V. c The distance L between the image acquisition area of ​​the image acquisition device and the receiving magnet assembly is used to calculate the time t1 for the train running gear to travel to the image acquisition area. t1=L / V c ; Furthermore, based on time t1, the image acquisition device is controlled to acquire multiple infrared images of the train running gear within several predetermined time intervals after the speed measuring magnet component is triggered. By accurately calculating the time t1 when the train running gear reaches the image acquisition area, the image acquisition device acquires images while the running gear is in the field of view, avoiding the acquisition of invalid images. At the same time, it reduces the probability of blurry images or missed shots. The acquisition of multiple images improves the redundancy of temperature data, making it easier to remove outliers in subsequent processing and improving measurement reliability.

[0037] In some embodiments of the present invention, the control module is further configured to control the image acquisition device at a preset time interval t. s Inside, the infrared image acquisition is performed by triggering the magnetic steel assembly twice. The cycle control makes the detection system work in sync with the train's running rhythm. For multi-car trains, the system can continuously detect each running part, which improves the system's applicability and efficiency.

[0038] In some embodiments of the present invention, a counter is further included; The counter is communicatively connected to both the receiving magnet assembly and the control module. After the first wheel of the train's running gear triggers the receiving magnet assembly, the counter begins recording the number of axles that have passed. Each subsequent trigger of the receiving magnet assembly increments the counter by 1 and transmits the count to the control module. When the counter reaches a predetermined value, the train is considered to have departed. The control module and image acquisition device then shut down after a predetermined delay to save system power. Taking a 6-car train as an example, a 6-car train has 24 axles. The train is considered to have departed when the counter records 24 axles. By presetting the counter value, the detection system provided by this invention can adapt to different train lengths.

[0039] In some embodiments of the present invention, the data processing module is configured to: after receiving infrared images, extract the highest temperature value within each infrared image as the temperature value of that infrared image, and sort the temperature values ​​of all infrared images in descending order to form a temperature value sequence. In this embodiment, the temperature value sequence is sequentially T... 2n+1T 2n T 2n-1 ..., T2, T1.

[0040] The first m values ​​of this temperature sequence are selected sequentially, denoted as T. 2n+1 T 2n T 2n-1 ... T 2n-m+2 .

[0041] Calculate the average value T of the first m temperature values. J(2n+1) : T J(2n+1) =(T 2n+1 +T 2n +T 2n-1 +……+T 2n-m+2 ) / m.

[0042] And calculate the first temperature value in the temperature value sequence and its average value T. J(2n+1) The absolute value of the difference: .

[0043] Where m < 2n + 1.

[0044] If the absolute value is greater than the set value S If the temperature value is incorrect, it is considered a mismeasured high temperature value and is removed from the temperature value sequence.

[0045] After removing incorrectly measured high-temperature values, the first m temperature values ​​in the temperature value sequence are reselected, which are T. 2n T 2n-1 ... T 2n-m+1 T 2n-m+1 Recalculate the average value T of the first m temperature values ​​in the temperature value sequence. J(2n+2-a) The absolute value of the difference between the first temperature value and the average value is calculated until the calculated absolute value is less than the set value S, which satisfies the condition. Given the conditions, determine the average value T. J(2n+2-a) The temperature of the train's running gear. Where 'a' represents the number of calculations.

[0046] If the above calculation is repeated b times and the condition is still not met, then the system is considered to have malfunctioned, where b is a preset value.

[0047] The workflow of the data processing module is as follows: Figure 8 As shown, through a series of processing steps on the temperature data, false values ​​can be effectively eliminated, detection errors can be reduced, and detection accuracy can be greatly improved. Through iterative processing, the influence of single-point anomalies can be avoided, ensuring the reliability of the output temperature.

[0048] In some embodiments of the present invention, the image acquisition device includes a caisson and multiple infrared image acquisition units. The multiple infrared image acquisition units are arranged and installed below the train track, and the caisson is positioned between the multiple infrared image acquisition units. Specifically, the number of infrared image acquisition units can be increased or decreased according to the detection points.

[0049] Infrared image acquisition unit such as Figure 6 As shown, it includes a protective housing and an infrared camera. The infrared camera is installed inside the protective housing, which has a lens opening covered with germanium glass. The lens of the infrared camera and the lens opening are on the same straight line.

[0050] like Figure 7 As shown, the workflow of the detection system provided in a specific embodiment of the present invention is as follows: When the train running gear passes the receiving magnet assembly, at a set time interval t s If the receiving magnet assembly is triggered twice, the control module will start; otherwise, it will be judged as a false triggering of the receiving magnet.

[0051] After the control module is started, the image acquisition device enters the shooting preparation state. When the train passes the speed measuring magnet assembly, the time interval t between the triggering of the two sets of speed measuring magnets in the speed measuring magnet assembly is used to determine the time. c Calculate the train speed V based on the distance L2 between the two sets of speed-measuring magnets. c =L2 / t c .

[0052] The control module determines the distance L between the image acquisition area of ​​the image acquisition device and the receiving magnet, and the train speed V. c Calculate the time t1 = L / V for the train running gear to travel to the image acquisition area. c .

[0053] The control module controls the image acquisition device to acquire 2n+1 infrared images within the time intervals t1-n·t, t1-(n-1)·t, ..., t1-t, t1, t1+t, t1, ..., t1+(n-1)·t, t1+n·t after the second triggering of the receiving magnet assembly. After all infrared images have been acquired, the infrared images are uploaded to the data processing module.

[0054] The data processing module calculates the temperature of the train's running gear based on infrared images of the train's running gear acquired by the image acquisition device.

[0055] Some embodiments of the present invention further provide a method for detecting the temperature of the running gear of an urban rail train, used to control the above-mentioned temperature detection system for the running gear of an urban rail train, the method comprising the following steps.

[0056] The trigger signal of the receiving magnet assembly is used to determine whether a train has passed; When it is determined that a train is passing, the train speed is calculated based on the trigger information of the speed measuring magnet component, and the time it takes for the train running gear to reach the image acquisition area of ​​the image acquisition device is further calculated. When the train running gear moves into the image acquisition area of ​​the image acquisition device, infrared images of the train running gear are acquired and uploaded to the data processing module; The data processing module calculates the temperature of the train's running gear based on infrared images of the running gear.

[0057] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A temperature detection system for the running gear of an urban rail train, characterized in that, include: Vehicle receiving magnet assembly, speed measuring magnet assembly, image acquisition device, control module, and data processing module; The receiving magnet assembly is installed inside the train track and is triggered when the train passes by, sending trigger information to the control module. The speed measuring magnet assembly is installed inside the train track and is triggered when the train passes by, sending trigger information to the control module. The image acquisition device is installed below the train track and is used to acquire infrared images of the train's running gear; The control module is communicatively connected to the receiving magnet assembly, the speed measuring magnet assembly, the image acquisition device, and the data processing module. The control module is configured to control the image acquisition device to acquire infrared images of the train running gear and upload them to the data processing module when the train running gear moves into the image acquisition area of ​​the image acquisition device, based on the trigger information of the receiving magnet assembly and the speed measuring magnet assembly. The data processing module is configured to calculate the temperature of the train running gear based on the infrared image of the train running gear acquired by the image acquisition device.

2. The urban rail train running gear temperature detection system according to claim 1, characterized in that, The distance L1 between the speed measuring magnet assembly and the receiving magnet assembly is greater than the distance L between the two axles of the same running gear of the train. CZ Less than the length L between the two bogies of the train car CX .

3. The urban rail train running gear temperature detection system according to claim 1, characterized in that, The receiving magnet assembly is at a predetermined time interval t s If the system is triggered twice consecutively, the control module is activated, and the image acquisition device is activated and enters the shooting preparation state through the control module.

4. The urban rail train running gear temperature detection system according to any one of claims 1-3, characterized in that, The speed measuring magnet assembly includes two sets of speed measuring magnets, which are arranged and installed inside the train track. The control module is configured to, when the train passes the speed-measuring magnet assembly, determine the trigger time interval t between the two sets of speed-measuring magnets. c Calculate the train speed V based on the distance L2 between the two sets of speed-measuring magnets. c : V c =L2 / t c 。 5. The urban rail train running gear temperature detection system according to claim 4, characterized in that, The control module is further configured to operate based on the calculated train speed V. c The time t1 for the train running gear to travel to the image acquisition area is calculated based on the distance L between the image acquisition area of ​​the image acquisition device and the receiving magnet assembly. t1=L / V c ; Then, based on the time t1, the image acquisition device is controlled to acquire multiple infrared images of the train running gear within multiple predetermined time intervals after the speed measuring magnet component is triggered.

6. The urban rail train running gear temperature detection system according to claim 1 or 5, characterized in that, The control module is further configured to control the image acquisition device at a preset time interval t. s Inside, the infrared image is acquired by triggering the receiving magnet assembly twice as one cycle.

7. The urban rail train running gear temperature detection system according to claim 1, characterized in that, Further includes a counter; The counter is communicatively connected to the receiving magnet assembly and the control module. Each time the receiving magnet is triggered, the counter increments by 1 and transmits the count to the control module. When the counter reaches a predetermined value, the control module shuts down after a predetermined delay.

8. The urban rail train running gear temperature detection system according to claim 1, characterized in that, The data processing module is configured to: after receiving an infrared image, extract the highest temperature value in each infrared image as the temperature value of that infrared image, and sort all the temperature values ​​of the infrared images in descending order to form a temperature value sequence. Calculate the average of the first m temperature values, and calculate the absolute value of the difference between the first temperature value in the temperature value sequence and the average value; If the absolute value is greater than the set value S, the temperature value is considered to be a falsely measured high temperature value, and the temperature value is removed from the temperature value sequence. After eliminating erroneous high-temperature values, the average value of the first m temperature values ​​in the temperature value sequence and the absolute value of the difference between the first temperature value and the average value are recalculated until the calculated absolute value is less than the set value S. The average value is then determined as the temperature of the train running gear.

9. The urban rail train running gear temperature detection system according to claim 8, characterized in that, The image acquisition device includes multiple infrared image acquisition units; the multiple infrared image acquisition units are arranged and installed below the train track. The infrared image acquisition unit includes a protective housing and an infrared camera; the infrared camera is installed inside the protective housing, and the protective housing has a lens hole, with the lens of the infrared camera and the lens hole located on the same straight line.

10. A method for detecting the temperature of the running gear of an urban rail train, used to control the temperature detection system of the running gear of an urban rail train as described in any one of claims 1-9, characterized in that, Includes the following steps: The system determines whether a train has passed based on the trigger signal from the receiving magnet assembly. When it is determined that a train is passing, the train speed is calculated based on the trigger information of the speed measuring magnet component, and the time it takes for the train running gear to reach the image acquisition area of ​​the image acquisition device is further calculated. When the train running gear moves into the image acquisition area of ​​the image acquisition device, infrared images of the train running gear are acquired and uploaded to the data processing module; The data processing module calculates the temperature of the train's running gear based on infrared images of the running gear.

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