Regulation and control device and method for improving skateboard trailing edge speed skin effect

Abstract

The invention discloses a regulation and control device and method for improving the skateboard trailing edge speed skin effect, and the device comprises a PC and a square closely-wound solenoid assembly which is disposed right below a skateboard bracket. The digital potentiometer is connected with the square close winding solenoid assembly; the GPS sensor, the infrared camera and the single chip microcomputer are connected with the PC; the digital potentiometer is connected with the single chip microcomputer; the PC determines the advancing direction of a train through GPS data, further determines the direction of current introduced into the square close-wound solenoid assembly, controls the single-chip microcomputer to adjust the resistance value of the digital potentiometer, and introduces current with preset magnitude into the square close-wound solenoid assembly to generate a magnetic field; according to a plurality of thermal infrared images, collected by the infrared camera, of the trailing edge of the sliding plate, whether the risk of the speed skin effect exists on the trailing edge of the sliding plate or not is determined, and when the risk exists, the resistance value of the digital potentiometer is adjusted, the current introduced into the square close winding solenoid assembly is increased to enhance the magnetic field, and the temperature of the trailing edge of the sliding plate is reduced to a reasonable range.

Description

Technical Field

[0001] The invention belongs to the technical field of bow-net safety, and in particular relates to a control device and method for improving the skin effect of the speed of the trailing edge of a slide plate. Background Art

[0002] With the rapid development of railways, the development of electrified railways has become increasingly important. The key part of the electrified locomotive to obtain power is the pantograph-catenary system; the train obtains current from the contact line through one or more pantographs installed on the top to realize the traction power supply for the locomotive. Therefore, the stability of the pantograph and contact line will directly affect the current collection quality and operating status of the train.

[0003] With the rapid development of high-speed rail, the speed of trains is getting faster and faster, making the speed skin effect more and more obvious. The high-speed sliding of the pantograph slide causes the rapid movement and change of the pantograph-net magnetic field, inducing an electric field and forming eddy currents, causing the current to tend to gather at the trailing edge of the pantograph slide, which may cause the current density distribution on the slide to become more uneven, and the local current density at the slide interface to increase sharply, causing the local temperature of the slide to soar. The resulting current transition concentration will inevitably lead to an increase in the local temperature rise of the slide, causing local thermal damage to the slide, which greatly increases the maintenance cost and maintenance cycle of the pantograph-net, reduces the service life of the slide and the contact line, and may even cause a pantograph-net accident in severe cases, resulting in irreparable loss of life and property. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a control device and method for improving the speed skin effect of the trailing edge of a skateboard, which solves the problem of the increasing speed skin effect caused by the increasing speed and load of existing trains.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0006] In a first aspect, a control device for improving the skin effect of the trailing edge velocity of a skateboard is provided, comprising:

[0007] A square closely wound solenoid assembly is disposed directly below the slide bracket and is used to generate a magnetic field to control the movement of electrons concentrated at the rear edge of the slide toward the front edge of the slide;

[0008] Infrared camera, used to collect thermal infrared images of the rear edge of the skateboard;

[0009] The digital potentiometer is used to be connected to the single-chip microcomputer and the square closely wound solenoid assembly respectively, and under the control of the single-chip microcomputer, the digital potentiometer changes its own resistance value and changes the current flowing into the square closely wound solenoid assembly;

[0010] GPS sensor, used to send the collected GPS data to the PC;

[0011] A PC is connected to the GPS sensor, the infrared camera and the single-chip computer, and is used to determine the direction of travel of the train according to the GPS data; determine the direction of the current passed into the square closely wound solenoid assembly based on the direction of travel, control the single-chip computer to adjust the resistance value of the digital potentiometer, and pass a preset current into the square closely wound solenoid assembly to generate a magnetic field; and

[0012] Based on multiple thermal infrared images of the trailing edge of the skateboard captured by the infrared camera within a preset time, the temperature difference between the highest temperature and the lowest temperature in each thermal infrared image is calculated, the maximum temperature difference is selected, and when the maximum temperature difference is greater than the preset temperature threshold, the single-chip microcomputer is controlled to adjust the resistance of the digital potentiometer, increase the current passed through the square closely wound solenoid assembly to enhance the magnetic field, until the maximum temperature difference of the trailing edge of the skateboard is less than the preset temperature threshold.

[0013] Furthermore, the control device for improving the skin effect of the trailing edge speed of the skateboard further includes a pressure sensor arranged directly below the skateboard bracket and connected to the PC; when the maximum temperature difference is greater than a preset temperature threshold, the PC further includes:

[0014] The contact pressure between the bow and the catenary collected by the pressure sensor is received to determine whether the contact pressure has changed. If so, it indicates that the train has started, and the GPS sensor is turned on, otherwise the GPS sensor is not turned on.

[0015] Furthermore, the square closely wound solenoid assembly includes a first closely wound solenoid located directly below the skateboard bracket and two square closely wound solenoid groups located in the area enclosed by the first closely wound solenoid, the two square closely wound solenoid groups being arranged side by side along the length direction of the skateboard bracket; each square closely wound solenoid group includes a plurality of second square closely wound solenoids connected in series and arranged in a row along the length direction of the skateboard bracket, each square closely wound solenoid group is connected in parallel with a digital potentiometer and then connected to an independent DC power supply.

[0016] Further, the length direction of the first closely wound solenoid is the same as the length direction of the skateboard bracket, and the length and width of the first closely wound solenoid are substantially equal to the length and width of the area directly below the skateboard bracket.

[0017] Furthermore, the two square closely wound solenoid groups are respectively adjacent to the long side direction of the first closely wound solenoid on the side where they are located.

[0018] Furthermore, the square tightly wound solenoid assembly is placed inside a high temperature resistant and insulating protective shell, the infrared camera is placed inside a protective cover, and its camera head extends out of the protective cover and faces the rear edge of the skateboard.

[0019] Furthermore, the GPS sensor is placed directly above the infrared camera.

[0020] Furthermore, two infrared cameras are provided, which are respectively located on both sides of the rear edge of the skateboard.

[0021] In a second aspect, a control method for a control device for improving the skin effect of a skateboard trailing edge velocity is provided, comprising the steps of:

[0022] S1, receiving the contact pressure between the bow and the catenary collected by the pressure sensor;

[0023] S2, judging whether the contact pressure changes, if so, it indicates that the train has started, then the GPS sensor is turned on and the process goes to step S3, otherwise the GPS sensor is not turned on;

[0024] S3, receiving GPS data collected by the GPS sensor in real time, determining the direction of travel of the train according to the GPS data, and determining the direction of current flowing into the square closely wound solenoid assembly based on the direction of travel;

[0025] S4, controlling the single chip microcomputer to adjust the resistance value of the digital potentiometer, passing a current of a preset magnitude into the square closely wound solenoid assembly to generate a magnetic field, so that the electrons densely packed at the rear edge of the slide move toward the front edge of the slide;

[0026] S5, receiving a plurality of thermal infrared images of the trailing edge of the skateboard collected by the infrared camera within a preset time, and calculating the temperature difference between the highest temperature and the lowest temperature in each thermal infrared image;

[0027] S6, select the maximum temperature difference and determine whether it is greater than a preset temperature threshold. If so, proceed to step S7, otherwise return to step S5;

[0028] S7, control the single chip microcomputer to adjust the resistance value of the digital potentiometer, increase the current passed through the square closely wound solenoid assembly to enhance the magnetic field, and then return to step S5.

[0029] Furthermore, the method for calculating the resistance of the digital potentiometer includes:

[0030] Based on the temperature difference, calculate the magnetic field strength generated by the square tightly wound solenoid assembly:

[0031]

[0032] Wherein, B is the magnetic field strength; μ0 is the magnetic permeability in vacuum; r is the distance between the magnetic field and the current generated by the skin effect, c is the specific heat capacity of air; m is the mass of the slide; R is the resistance of the slide; t is the preset time; ΔT is the temperature difference;

[0033] Based on the magnetic field strength, calculate the current flowing through the square tightly wound solenoid assembly:

[0034]

[0035] Where, I is the current flowing into the square closely wound solenoid assembly;

[0036] The resistance value of the digital potentiometer is calculated based on the current passed through the square closely wound solenoid assembly and the voltage of the DC power supply.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1) This scheme can detect the direction of the train's movement through the GPS sensor set up, so that it can be determined which direction is the rear edge of the skateboard, so as to accurately determine the direction of the current passed into the square closely wound solenoid assembly to ensure that the electrons at the rear edge of the skateboard move to the front edge of the skateboard; when the GPS sensor detects that the train is moving, it starts to supply a current to one side of the square closely wound solenoid, so that the adjustment of the electron movement state begins from the initial stage of the train start.

[0039] 2) After the train starts, this scheme uses an infrared camera to collect multiple thermal infrared images of the trailing edge of the skateboard within a preset time, and determines whether the trailing edge of the skateboard is about to produce a speed skin effect based on the temperature field of the thermal infrared image, so as to adjust the magnetic field strength in time to keep the temperature of the trailing edge of the skateboard within a reasonable range, thereby improving the current concentration at the trailing edge of the skateboard, thereby reducing the replacement cycle of the contact wire and the skateboard, extending the service life of the bow-net contact pair and saving maintenance costs, further protecting electrical equipment, and improving the safety of train driving.

[0040] 3) This solution can determine whether the train is in motion by collecting changes in the contact pressure between the bow and the catenary through the pressure sensor, so as to determine whether to continue to supply power to the digital potentiometer to generate a magnetic field. Through the coordination of the GPS sensor and the pressure sensor, the direction of movement of the train and whether the train is moving can be accurately evaluated, so as to facilitate timely and dynamic start-up to generate a magnetic field to avoid the speed skin effect.

[0041] 4) When the device of this scheme is applied to a train, there is no need to adjust the bow-net structure on the train. Directly assembling each component to the corresponding position of the bow-net can improve the speed skin effect of the train movement process, effectively saving costs and further improving the feasibility and convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The schematic diagram of the control device for improving the skin effect of the trailing edge speed of a skateboard is shown in FIG.

[0043] Figure 2 It is a schematic diagram of the structure in which a square closely wound solenoid assembly is placed under a slide plate.

[0044] Figure 3The present invention is a flow chart of a control method of a control device for improving the skin effect of the trailing edge speed of a skateboard.

[0045] Figure 4 Schematic diagram of an infrared camera placed on the trailing edge of the skateboard on top of a train.

[0046] Among them, 1. Carbon slide plate; 2. Square closely wound solenoid assembly; 21. First closely wound solenoid; 22. Second square closely wound solenoid; 3. Train roof; 4. Infrared camera. DETAILED DESCRIPTION

[0047] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0048] like Figure 1 As shown, the control device for improving the skin effect of the trailing edge speed of the skateboard of the present scheme includes:

[0049] The square closely wound solenoid assembly 2 is arranged directly below the slide bracket and is used to generate a magnetic field to control the movement of electrons concentrated at the rear edge of the slide to the front edge of the slide. The slide bracket is the structure of the carbon slide 1 on which the pantograph is installed.

[0050] The infrared camera 4 is used to collect the thermal infrared image of the rear edge of the slide plate, which is installed on the roof 3 of the train; Figure 4 As shown, in this solution, preferably two infrared cameras 4 are provided, which are respectively located on both sides of the rear edge of the skateboard.

[0051] The digital potentiometer is used to be connected to the single chip microcomputer and the square closely wound solenoid assembly 2 respectively, and under the control of the single chip microcomputer, changes the size of its own resistance value to change the size of the current flowing into the square closely wound solenoid assembly.

[0052] The GPS sensor is used to send the collected GPS data to the PC; in order to ensure good satellite signal reception and reduce interference, the GPS sensor is preferably placed directly above the infrared camera 4. This ensures that the installation location of the GPS sensor is away from possible electromagnetic interference sources and can obtain a wide field of view.

[0053] The PC is connected to the GPS sensor, the infrared camera 4 and the single-chip microcomputer, and is used to determine the direction of travel of the train according to the GPS data; based on the direction of travel, the direction of the current passed into the square closely wound solenoid assembly 2 is determined, and the single-chip microcomputer is controlled to adjust the resistance value of the digital potentiometer, and a current of a preset size is passed into the square closely wound solenoid assembly 2 to generate a magnetic field.

[0054] Based on multiple thermal infrared images of the rear edge of the skateboard collected by the infrared camera 4 within a preset time, the temperature difference between the highest temperature and the lowest temperature in each thermal infrared image is calculated, the maximum temperature difference is selected, and when the maximum temperature difference is greater than the preset temperature threshold, the single-chip microcomputer is controlled to adjust the resistance of the digital potentiometer, increase the current passed through the square closely wound solenoid assembly 2 to enhance the magnetic field, until the maximum temperature difference of the rear edge of the skateboard is less than the preset temperature threshold.

[0055] During implementation, the control device preferably used to improve the skin effect of the speed of the trailing edge of the skateboard in this scheme also includes a pressure sensor arranged directly below the skateboard bracket and connected to the PC; when the maximum temperature difference is greater than the preset temperature threshold, the PC also includes receiving the contact pressure between the bow and the catenary collected by the pressure sensor, and judging whether the contact pressure has changed. If so, it indicates that the train has started, and the GPS sensor is turned on, otherwise the GPS sensor is not turned on.

[0056] like Figure 2 As shown, the square closely wound solenoid assembly 2 includes a first closely wound solenoid 21 located directly below the skateboard bracket and two square closely wound solenoid groups located in the area enclosed by the first closely wound solenoid 21, and the two square closely wound solenoid groups are arranged side by side along the length direction of the skateboard bracket; each square closely wound solenoid group includes a plurality of second square closely wound solenoids 22 connected in series and arranged in a row along the length direction of the skateboard bracket, and each square closely wound solenoid group is connected in parallel with a digital potentiometer and then connected to an independent DC power supply.

[0057] By arranging a plurality of second square closely wound solenoids 22 inside the first closely wound solenoid 21, the present scheme can make the magnetic field generated by the second square closely wound solenoids 22 evenly distributed in the length direction of the area enclosed by the first closely wound solenoids 21 through the action of the first closely wound solenoids 21, so as to ensure that the electrons at the trailing edge of the skateboard are all subjected to the Lorentz force toward the leading edge of the skateboard.

[0058] like Figure 2 As shown, each square closely wound solenoid group includes four small second square closely wound solenoids 22, and four on one side are connected in series and in parallel with a digital potentiometer and a single chip microcomputer and then connected to a DC power supply, so that power supply on both sides is independently controlled, and power supply on one side is performed independently according to data transmitted to the PC by the GPS sensor, so as to improve the local temperature of the rear edge of the skateboard, and the current flowing into the four second square closely wound solenoids 22 can be accurately controlled through the cooperation of the infrared camera 4 and the PC.

[0059] During implementation, the scheme preferably has the length direction of the first closely wound solenoid 21 being the same as the length direction of the skateboard bracket, and the length and width of the first closely wound solenoid 21 being substantially equal to the length and width of the area directly below the skateboard bracket. With this arrangement, when the speed skin effect is controlled, the length direction of the skateboard's trailing edge can be placed in the magnetic field, so that the electrons in the length direction of the skateboard's trailing edge are all subjected to the Lorentz force and move toward the skateboard's leading edge.

[0060] The two square closely wound solenoid groups are respectively adjacent to the long side direction of the first closely wound solenoid 21 on their side; this arrangement can make the square closely wound solenoid group closer to the rear edge of the skateboard, and the generated magnetic field is also closer to the rear edge of the skateboard, ensuring that the electrons at the rear edge of the skateboard can better move toward the front edge of the skateboard.

[0061] The square tightly wound solenoid assembly 2 is placed inside a high temperature resistant and insulating protective housing, which can extend the service life of the square tightly wound solenoid; the infrared camera 4 is placed inside a protective cover, and its camera extends out of the protective cover and faces the rear edge of the skateboard. The protective cover can ensure that the infrared camera 4 can be used normally in bad weather.

[0062] refer to Figure 3 , Figure 3 A flow chart showing a control method of a control device for improving the skin effect of the trailing edge speed of a skateboard is shown; Figure 3 As shown, the method S includes steps S1 to S7.

[0063] In step S1, receiving the contact pressure between the bow and the catenary collected by the pressure sensor;

[0064] In step S2, it is determined whether the contact pressure changes. If so, it indicates that the train has started, and the GPS sensor is turned on, and the process proceeds to step S3. Otherwise, the GPS sensor is not turned on.

[0065] In step S3, the GPS data collected by the GPS sensor in real time is received, the traveling direction of the train is determined according to the GPS data, and the direction of the current flowing into the square closely wound solenoid assembly 2 is determined based on the traveling direction;

[0066] In step S4, the single chip microcomputer is controlled to adjust the resistance value of the digital potentiometer, and a current of a preset magnitude is passed through the square closely wound solenoid assembly 2 to generate a magnetic field, so that the electrons concentrated at the rear edge of the slide move toward the front edge of the slide;

[0067] In step S5, a plurality of thermal infrared images of the rear edge of the skateboard collected by the infrared camera 4 within a preset time are received, and the temperature difference between the highest temperature and the lowest temperature in each thermal infrared image is calculated;

[0068] In step S6, the maximum temperature difference is selected and it is determined whether it is greater than a preset temperature threshold. If so, the process proceeds to step S7, otherwise, the process returns to step S5;

[0069] In step S7, the single chip microcomputer is controlled to adjust the resistance value of the digital potentiometer, and the current flowing through the square closely wound solenoid assembly 2 is increased to enhance the magnetic field, and then the process returns to step S5.

[0070] After the train starts, the control method of this scheme can quickly intervene in the current flow path of the skateboard based on the temperature difference at the trailing edge of the skateboard, so that the local temperature at the trailing edge of the skateboard can reach the optimal state, thereby improving the speed skin effect of the skateboard.

[0071] In one embodiment of the present invention, the method for calculating the resistance value of a digital potentiometer includes:

[0072] Based on the temperature difference, calculate the magnetic field strength generated by the square tightly wound solenoid assembly:

[0073]

[0074] Wherein, B is the magnetic field strength; μ0 is the magnetic permeability in vacuum; r is the distance between the magnetic field and the current generated by the skin effect, c is the specific heat capacity of air; m is the mass of the slide; R is the resistance of the slide; t is the preset time; ΔT is the temperature difference;

[0075] According to the magnetic field strength, calculate the current flowing into the square tightly wound solenoid assembly 2:

[0076]

[0077] Wherein, I is the current flowing into the square closely wound solenoid assembly 2;

[0078] The resistance value of the digital potentiometer is calculated based on the current passed into the square closely wound solenoid assembly 2 and the voltage of the DC power supply.

[0079] Through the above calculation method, this solution can intuitively determine the required magnetic field strength, can achieve precise control of the skin effect of the trailing edge of the skateboard, achieve the most ideal control method, reduce the maximum temperature of the trailing edge of the skateboard, and enhance the service life of the skateboard.

[0080] The working principle of the control method used in this scheme is:

[0081] When electrons move in a magnetic field, when the direction of electron movement is not parallel to the direction of the magnetic field, they will be affected by the Lorentz force generated by the magnetic field, thereby changing the trajectory of the electrons and making a circular motion similar to a spring until they reach the current-collecting arm, thereby improving the current path at the trailing edge of the skateboard and improving the surface temperature at the trailing edge of the skateboard. As the train travels faster and faster, the speed skin effect becomes more and more obvious. Through the intervention of the magnetic field, the trajectory of electrons in the current is interfered with, thereby reducing the concentration of electrons gathered at the trailing edge of the skateboard, thereby slowing down the local temperature rise.

[0082] This solution uses a PC to dually control the digital potentiometer and the single-chip microcomputer through the data transmitted by the square closely wound solenoid assembly 2 and the pressure sensor, thereby controlling the magnitude of the current flowing into the square closely wound solenoid assembly, thereby changing the relative magnetic field, improving the problem of abnormal local temperature of the slide plate, and increasing the service life of the contact pair.

[0083] In summary, this scheme can improve the speed skin effect of the skateboard by controlling the temperature of the trailing edge of the skateboard within a reasonable range, increase the service life and operating performance of the contact wire and pantograph, and improve the path of current from the contact wire to the skateboard and then to the current collecting arm, thereby improving the current collection quality.

Claims

1. A control device for improving the skin effect of the trailing edge speed of a skateboard, characterized in that: include: A square closely wound solenoid assembly is disposed directly below the slide bracket and is used to generate a magnetic field to control the movement of electrons concentrated at the rear edge of the slide toward the front edge of the slide; Infrared camera, used to collect thermal infrared images of the rear edge of the skateboard; The digital potentiometer is used to be connected to the single-chip microcomputer and the square closely wound solenoid assembly respectively, and under the control of the single-chip microcomputer, the digital potentiometer changes its own resistance value and changes the current flowing into the square closely wound solenoid assembly; GPS sensor, used to send the collected GPS data to the PC; The PC is connected to the GPS sensor, the infrared camera and the single-chip computer, and is used to determine the direction of travel of the train according to the GPS data; based on the direction of travel, the direction of the current passed into the square closely wound solenoid assembly is determined, and the single-chip computer is controlled to adjust the resistance value of the digital potentiometer, and a current of a preset magnitude is passed into the square closely wound solenoid assembly to generate a magnetic field; as well as Based on multiple thermal infrared images of the trailing edge of the skateboard captured by the infrared camera within a preset time, the temperature difference between the highest temperature and the lowest temperature in each thermal infrared image is calculated, the maximum temperature difference is selected, and when the maximum temperature difference is greater than the preset temperature threshold, the single-chip microcomputer is controlled to adjust the resistance of the digital potentiometer, increase the current passed through the square closely wound solenoid assembly to enhance the magnetic field, until the maximum temperature difference of the trailing edge of the skateboard is less than the preset temperature threshold.

2. The control device for improving the skin effect of the trailing edge speed of a skateboard according to claim 1, characterized in that: The device further includes a pressure sensor disposed directly below the skateboard bracket and connected to the PC; when the maximum temperature difference is greater than a preset temperature threshold, the PC further includes: The contact pressure between the bow and the catenary collected by the pressure sensor is received to determine whether the contact pressure has changed. If so, it indicates that the train has started, and the GPS sensor is turned on, otherwise the GPS sensor is not turned on.

3. The control device for improving the skin effect of the trailing edge speed of a skateboard according to claim 1, characterized in that: The square closely wound solenoid assembly comprises a first closely wound solenoid located directly below the skateboard bracket and two square closely wound solenoid groups located in the area enclosed by the first closely wound solenoid, the two square closely wound solenoid groups being arranged side by side along the length direction of the skateboard bracket; each square closely wound solenoid group comprises a plurality of second square closely wound solenoids connected in series and arranged in a row along the length direction of the skateboard bracket, each square closely wound solenoid group being connected in parallel with a digital potentiometer and then connected to an independent DC power supply.

4. The control device for improving the skin effect of the trailing edge speed of a skateboard according to claim 3, characterized in that: The length direction of the first closely wound solenoid is the same as the length direction of the skateboard bracket, and the length and width of the first closely wound solenoid are substantially equal to the length and width of the area directly below the skateboard bracket.

5. The control device for improving the skin effect of the trailing edge speed of a skateboard according to claim 3, characterized in that: The two square closely wound solenoid groups are respectively adjacent to the long side direction of the first closely wound solenoid on the side where they are located.

6. The control device for improving the skin effect of the trailing edge speed of a skateboard according to claim 1, characterized in that: The square closely wound solenoid assembly is placed inside a high temperature resistant and insulating protective shell, the infrared camera is placed inside a protective cover, and the camera head thereof extends out of the protective cover and faces the rear edge of the skateboard.

7. The control device for improving the skin effect of the trailing edge speed of a skateboard according to claim 1, characterized in that: The GPS sensor is placed just above the infrared camera.

8. The control device for improving the skin effect of the trailing edge speed of a skateboard according to claim 1, characterized in that: Two infrared cameras are provided, which are respectively located on both sides of the rear edge of the skateboard.

9. The control method of the control device for improving the skin effect of the trailing edge velocity of a skateboard according to any one of claims 2 to 8, characterized in that: Includes steps: S1, receiving the contact pressure between the bow and the catenary collected by the pressure sensor; S2, judging whether the contact pressure changes, if so, it indicates that the train has started, then the GPS sensor is turned on and the process goes to step S3, otherwise the GPS sensor is not turned on; S3, receiving GPS data collected by the GPS sensor in real time, determining the direction of travel of the train according to the GPS data, and determining the direction of current flowing into the square closely wound solenoid assembly based on the direction of travel; S4, controlling the single chip microcomputer to adjust the resistance value of the digital potentiometer, passing a current of a preset magnitude into the square closely wound solenoid assembly to generate a magnetic field, so that the electrons densely packed at the rear edge of the slide move toward the front edge of the slide; S5, receiving a plurality of thermal infrared images of the trailing edge of the skateboard collected by the infrared camera within a preset time, and calculating the temperature difference between the highest temperature and the lowest temperature in each thermal infrared image; S6, select the maximum temperature difference and determine whether it is greater than a preset temperature threshold. If so, proceed to step S7, otherwise return to step S5; S7, control the single chip microcomputer to adjust the resistance value of the digital potentiometer, increase the current passed through the square closely wound solenoid assembly to enhance the magnetic field, and then return to step S5.

10. The control method according to claim 9, characterized in that: Methods for calculating the resistance of a digital potentiometer include: Based on the temperature difference, calculate the magnetic field strength generated by the square tightly wound solenoid assembly: Wherein, B is the magnetic field strength; μ0 is the magnetic permeability in vacuum; r is the distance between the magnetic field and the current generated by the skin effect, c is the specific heat capacity of air; m is the mass of the slide; R is the resistance of the slide; t is the preset time; ΔT is the temperature difference; Based on the magnetic field strength, calculate the current flowing through the square tightly wound solenoid assembly: Where, I is the current flowing into the square closely wound solenoid assembly; The resistance value of the digital potentiometer is calculated based on the current passed through the square closely wound solenoid assembly and the voltage of the DC power supply.

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