Detection frequency self-adaptive track circuit compensation capacitor detection system and method

Abstract

The invention discloses a track circuit compensation capacitance detection system and method with self-adaptive detection frequency. The system comprises a detection frequency matching module, a control unit, an amplifier, a transmitting antenna, a receiving antenna and a data processing module, wherein the detection frequency matching module is used for carrying out matching from a line database according to a current detection section to obtain a plurality of detection frequencies corresponding to the current detection section; the line database comprises alternative detection frequencies, obtained through field tests in advance, of compensation capacitors of all detection sections; the alternative detection frequencies comprise a plurality of detection frequencies from low to high; the control unit is used for generating a low-frequency aliasing signal and a high-frequency aliasing signal by using a plurality of detection frequencies corresponding to the current detection section; the amplifier is used for optimizing the low-frequency aliasing signal and the high-frequency aliasing signal respectively, and the data processing module is used for outputting a compensation capacitance detection result. According to the invention, co-frequency signal interference, non-detection target interference and roadbed interference can be realized.

Description

Technical Field

[0001] This invention relates to the field of integrated inspection train railway signal detection technology, and in particular to a detection system and method for track circuit compensation capacitors with adaptive detection frequency. Background Technology

[0002] (I) Track circuit compensation capacitor

[0003] Compensating capacitors are key components in frequency-shifting track circuit systems, playing a crucial role in compensation and optimization. Their primary function is to compensate for reactive power losses caused by the inductive reactance of the rails due to the excessive length of the track circuit, thereby optimizing the transmission efficiency of the track circuit on the rails. Simultaneously, they ensure that the shunt performance and rail break detection functions operate normally when both ends of the rail are grounded.

[0004] (II) Existing Compensation Capacitor Detection System

[0005] Aside from manual inspections, the current status monitoring of railway signaling system infrastructure primarily relies on routine dynamic inspections of the track using integrated inspection vehicles. Track circuit compensation capacitors are a core component of dynamic signal monitoring. Existing dynamic detection systems for compensation capacitors are based on the principle of electromagnetic induction, relying on a transmitting antenna to induce a current in the wheelset-rail circuit, thereby enabling the detection of compensation capacitors. Figure 1 Here is a schematic diagram of an existing compensation capacitor detection system, such as... Figure 1 As shown, a sinusoidal signal is obtained from a signal source, processed by a driving circuit to obtain a power signal transmitting antenna, and then induced by an alternating magnetic field to a receiving antenna. After passing through a signal conditioning circuit, AD acquisition, and data analysis, a digital signal is obtained, and finally, the digital signal is analyzed and displayed.

[0006] The capacitance detection system is deployed between the two bogies under the car, with the rails and the front and rear wheelsets forming a closed loop. Two sets of compensating capacitor transmitting antennas are arranged above the rails, and one set of compensating capacitor receiving antennas is arranged at the center of the track adjacent to the transmitting antennas.

[0007] The transmitting end of the detection equipment generates a sinusoidal signal of a specific frequency and power, driving the transmitting antenna and creating an alternating magnetic field. In the detection system, the magnetic circuit direction of the transmitting antenna is typically perpendicular to the rail direction, generating an alternating magnetic flux in the rail-wheel loop below it, which in turn induces a current. The receiving antenna has a similar structure to the transmitting antenna, receiving changes in magnetic flux parallel to the rail. The compensation capacitor and its leads are generally connected laterally to the rail. Once inside the detection loop, the current flowing through it is perpendicular to the rail, thus generating an alternating magnetic field. As the capacitor moves relative to the rail within the loop, the receiving antenna also receives this change in magnetic flux, generating an induced electromotive force.

[0008] The induced electromotive force is transmitted via cable to Figure 1 The signal conditioning circuit in the system amplifies and filters the signal before performing an analog-to-digital (A / D) conversion. The data is then transmitted to a computer for analysis, resulting in a series of signals of varying high and low levels. Finally, the data is transmitted to a display and analysis interface for presentation.

[0009] At the location of the compensation capacitor, the induced electromotive force will show a significant difference compared to the pure roadbed section, resembling a pulse signal. (See [link to relevant documentation]). Figure 2 , Figure 2 The output waveform of the compensation capacitor detection system under ideal conditions is shown. This pulse will disappear where the compensation capacitor is faulty or missing, thus enabling the detection of the compensation capacitor.

[0010] (III) Problems with Existing Compensation Capacitor Detection Systems

[0011] The existing compensation capacitor detection system has the following problems:

[0012] 1) Co-channel interference

[0013] Due to the limited space in inspection trains, the placement of the compensation capacitor detection system on many inspection trains is not ideal. Furthermore, most existing inspection trains are electrically driven, and the magnetic field generated by the high-power onboard motors is received by the receiving antenna, thus creating interference signals. While filters in the detection system can effectively suppress signals outside the detection frequency band, a large amount of co-frequency signals are still received by the system, causing interference. This interference is closely related to the train model and the placement of the under-train antenna. In some vehicles, it can even overwhelm the compensation capacitor pulse signal, severely affecting the identification of the compensation capacitor. (See also...) Figure 3 , Figure 3 The output waveform of the compensation capacitor detection system under interference is shown, including small noise.

[0014] 2) Interference from non-detection targets

[0015] Besides the compensation capacitor, there are numerous metal rods spanning the track on-site, such as the reinforcing bars in railway bridges and high-speed railway ballastless subgrades. These objects also cause fluctuations in the magnetic field generated by the detection signal, which couples into the receiving antenna. This signal is very similar to the signal generated by the compensation capacitor being detected. In some harsh sections, its amplitude can be close to, or even completely drown out, the compensation capacitor pulse, severely affecting the identification of the compensation capacitor.

[0016] 3) Differences in the response of compensation capacitors with different capacitance values ​​to the detection signal

[0017] The capacitance values ​​of compensation capacitors used vary depending on the line conditions, while existing detection systems employ the same frequency detection signal. Capacitors with different capacitance values ​​exhibit significantly different responses to this signal. This can lead to excessively low pulse values ​​for compensation capacitors in certain sections, affecting their identification. (See also...) Figure 4 The pulse indicates that the compensation capacitance is too low.

[0018] 4) The influence of different roadbeds on the magnetic field forming the detection signal

[0019] Different track conditions result in significant differences in the electrical characteristics of the roadbed. This, in turn, affects the distribution of the magnetic field, causing the detection baseline of the compensation capacitor to rise or fall. This problem is particularly pronounced in sections where there is a switch between ballastless and ballasted track, or in sections where there is a switch between bridges and roadbed. (See [reference needed]). Figure 5 .

[0020] In summary, existing compensation capacitor detection systems have at least some technical defects, and there is an urgent need for a new track circuit compensation capacitor detection system and method to solve these technical defects. Summary of the Invention

[0021] This invention provides a track circuit compensation capacitor detection system with adaptive detection frequency, used to reduce interference from co-frequency signals, non-detection target interference, and roadbed interference in compensation capacitor detection, and to reduce the adverse effects caused by differences in compensation capacitor values. The system includes:

[0022] The system includes a frequency matching module, a control unit, an amplifier, two transmitting antennas, a receiving antenna, and a data processing module.

[0023] The detection frequency matching module is used to: obtain the current detection segment, match multiple detection frequencies corresponding to the current detection segment from the line database based on the current detection segment, and send the multiple detection frequencies corresponding to the current detection segment to the control unit; the line database includes candidate detection frequencies for compensation capacitors of each detection segment obtained in advance through field tests; the candidate detection frequencies include multiple detection frequencies from low to high;

[0024] The control unit is used to: receive multiple detection frequencies corresponding to the current detection segment, and generate low-frequency aliasing signals and high-frequency aliasing signals using the multiple detection frequencies corresponding to the current detection segment;

[0025] The amplifier is used to optimize low-frequency aliasing signals and high-frequency aliasing signals respectively, and generate low-frequency detection signals and high-frequency detection signals;

[0026] The low-frequency detection signal and the high-frequency detection signal are used to drive the two transmitting antennas respectively, and the receiving antenna receives the compensation capacitor detection signal.

[0027] The data processing module is used to process the compensation capacitor detection signal and output the compensation capacitor detection result.

[0028] This invention also provides a method for detecting track circuit compensation capacitors with adaptive detection frequency, to reduce interference from co-frequency signals, non-detection target interference, and roadbed interference in compensation capacitor detection, and to reduce the adverse effects caused by differences in compensation capacitor values. The method includes:

[0029] Obtain the current detection segment, and match multiple detection frequencies corresponding to the current detection segment from the line database based on the current detection segment;

[0030] Low-frequency aliasing signals and high-frequency aliasing signals are generated using multiple detection frequencies corresponding to the current detection segment;

[0031] The low-frequency aliasing signal and the high-frequency aliasing signal are optimized respectively to generate a low-frequency detection signal and a high-frequency detection signal. The low-frequency detection signal and the high-frequency detection signal are used to drive two transmitting antennas respectively, and the receiving antenna receives the compensation capacitor detection signal.

[0032] The compensation capacitor detection signal is processed, and the compensation capacitor detection result is output.

[0033] This invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described detection frequency adaptive track circuit compensation capacitor detection method.

[0034] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described detection frequency adaptive track circuit compensation capacitor detection method.

[0035] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the above-described detection frequency adaptive track circuit compensation capacitor detection method.

[0036] The adaptive track circuit compensation capacitor detection system in this embodiment of the invention has multiple preset alternative detection frequencies, covering the detection needs of compensation capacitors for most lines. In use, based on known line conditions, multiple detection frequencies are automatically selected from the line database, generating low-frequency aliasing signals and high-frequency aliasing signals. After amplifier optimization, these signals drive two transmitting antennas respectively. After the compensation capacitor responds, the signals are collected by the receiving antenna, processed by the data processing module, and the compensation capacitor detection results are output. The alternative detection frequency matching and subsequent processing for each detection section of the compensation capacitor obtained through field experiments in this embodiment of the invention can reduce interference from co-frequency signals, non-detection target interference, and roadbed interference in compensation capacitor detection, reduce the adverse effects of differences in compensation capacitor values, and improve the detection efficiency of compensation capacitors. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0038] Figure 1 Here is a schematic diagram of an existing compensation capacitor detection system;

[0039] Figure 2 This is the output waveform of a compensation capacitor detection system under ideal conditions in the prior art;

[0040] Figure 3 The output waveform of a compensation capacitor detection system subject to interference in the prior art;

[0041] Figure 4 The diagram illustrates the difference in response to the detection signal by compensation capacitors of different capacitance values ​​in the prior art.

[0042] Figure 5 The output waveform of a compensation capacitor detection system with baseline fluctuations in the prior art;

[0043] Figure 6 This is a schematic diagram of a track circuit compensation capacitor detection system with adaptive detection frequency in an embodiment of the present invention;

[0044] Figure 7 This is a specific example diagram of the track circuit compensation capacitor detection system with adaptive detection frequency in an embodiment of the present invention;

[0045] Figure 8 This is another specific example of the detection frequency adaptive track circuit compensation capacitor detection system in this invention.

[0046] Figure 9 This is a schematic diagram of the antenna arrangement of the track circuit compensation capacitor detection system with adaptive detection frequency in an embodiment of the present invention;

[0047] Figure 10 This is the magnetic flux density modulus distribution of the compensation capacitor detection system simulated by software in an embodiment of the present invention;

[0048] Figure 11 This is a first example diagram of the transmitting and receiving antenna in an embodiment of the present invention;

[0049] Figure 12 The magnetic field distribution of the transmitting antenna of the transmitting and receiving antenna in the first example diagram of this embodiment of the invention;

[0050] Figure 13 This is a second example diagram of the transmitting and receiving antenna in an embodiment of the present invention;

[0051] Figure 14 This is a schematic diagram comparing the magnetic field line distribution of two types of antennas according to an embodiment of the present invention;

[0052] Figure 15 This is a schematic diagram of the outer casing of the transmitting and receiving antenna in an embodiment of the present invention;

[0053] Figure 16 This is a schematic flowchart of the detection method for the adaptive track circuit compensation capacitor in an embodiment of the present invention. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0055] The acquisition, storage, use, and processing of data in this application all comply with the relevant provisions of national laws and regulations.

[0056] Figure 6 This is a schematic diagram of a frequency-adaptive track circuit compensation capacitor detection system according to an embodiment of the present invention, as shown below. Figure 6 As shown, the system 600 includes: a frequency matching module 601, a control unit 602, an amplifier 603, two transmitting antennas 604, a receiving antenna 605, and a data processing module 606. Among them,

[0057] The detection frequency matching module 601 is used to: obtain the current detection segment, match multiple detection frequencies corresponding to the current detection segment from the line database based on the current detection segment, and send the multiple detection frequencies corresponding to the current detection segment to the control unit; the line database includes candidate detection frequencies for compensation capacitors of each detection segment obtained in advance through field tests; the candidate detection frequencies include multiple detection frequencies from low to high;

[0058] The control unit 602 is used to: receive multiple detection frequencies corresponding to the current detection segment, and generate low-frequency aliasing signals and high-frequency aliasing signals using the multiple detection frequencies corresponding to the current detection segment;

[0059] Amplifier 603 is used to: optimize low-frequency aliasing signals and high-frequency aliasing signals respectively, and generate low-frequency detection signals and high-frequency detection signals;

[0060] The low-frequency detection signal and the high-frequency detection signal are used to drive the two transmitting antennas 604 respectively, and the receiving antenna 605 receives the compensation capacitor detection signal.

[0061] The data processing module 606 is used to process the compensation capacitor detection signal and output the compensation capacitor detection result.

[0062] The following describes in detail the detection frequency adaptive track circuit compensation capacitor detection system in the embodiments of the present invention.

[0063] In specific implementation, the detection frequency matching module 601 is used to: receive line mileage data from the integrated detection train system, combine it with the built-in database to determine the current detection section, thereby obtaining the current detection section. Then, it reads the line database to match and obtain the detection frequency of the detection section, and sends the detection frequency of the detection section to the control unit.

[0064] In one embodiment, the line database includes a low-frequency group and a high-frequency group;

[0065] Each low-frequency group includes multiple low-frequency detection frequencies, and each high-frequency group includes multiple high-frequency detection frequencies.

[0066] Furthermore, the low-frequency group may include a low-frequency backup group and a low-frequency primary group, and the high-frequency group may include a high-frequency backup group and a high-frequency primary group. When obtaining the detection frequency corresponding to the current detection segment, the detection frequency is preferentially obtained from the low-frequency primary group and / or the high-frequency primary group.

[0067] The line database can also include information on the compensation capacitors of each detection section, such as location and capacitance value.

[0068] The detection frequency matching module 601 is specifically used to: obtain multiple low-frequency detection frequencies and multiple high-frequency detection frequencies corresponding to the current detection section from the line database based on the current detection section. For example, it obtains one or more low-frequency detection frequencies from the low-frequency group and one or more high-frequency detection frequencies from the high-frequency group.

[0069] The control unit 602 is specifically used to: generate a low-frequency aliasing signal using multiple low-frequency detection frequencies corresponding to the current detection segment, and generate a high-frequency aliasing signal using multiple high-frequency detection frequencies corresponding to the current detection segment.

[0070] In practice, the control unit 602 is specifically used to: generate a low-frequency aliasing signal using multiple low-frequency detection frequencies corresponding to the current detection segment based on DDS (Direct Digital Synthesis) technology, and generate a high-frequency aliasing signal using multiple high-frequency detection frequencies corresponding to the current detection segment.

[0071] Figure 7 This is a specific example diagram of a frequency-adaptive track circuit compensation capacitor detection system according to an embodiment of the present invention, as shown below. Figure 7The diagram illustrates the specific processing flow of a simplified configuration of the system. The system may also include a configuration interface; this interface can be used to configure the system's operating mode and / or maintain the line database; the operating mode includes multiple parameters supporting the system's operation.

[0072] refer to Figure 7 The detection frequency matching module 601 may include a switching command triggering unit, which is used to receive the detection mileage from the detection train integrated system, determine the current detection section, determine the detection frequency, and send the detection frequency to the control unit.

[0073] refer to Figure 7 The control unit 602 is specifically used to: receive multiple low-frequency detection frequencies and multiple high-frequency detection frequencies corresponding to the current detection segment, and control the low-frequency signal generator L and the low-frequency signal generator H to generate detection low-frequency and high-frequency mixed signals respectively.

[0074] In practice, after generating low-frequency and high-frequency aliased signals, two signal amplifiers are used to amplify and optimize the low-frequency and high-frequency aliased signals to generate low-frequency detection signals and high-frequency detection signals.

[0075] In one embodiment, the amplifier 603 in the system includes a low-frequency amplifier group and a high-frequency amplifier group; the low-frequency amplifier group includes two low-frequency amplifiers, and the high-frequency amplifier group includes two high-frequency amplifiers.

[0076] For example, Figure 7 As shown, it includes a low-frequency amplifier group L and a high-frequency amplifier group H.

[0077] In one embodiment, the system may also provide a switching unit at the input and output of the amplifier, the switching unit being used to select the amplifier.

[0078] Figure 8 This is another specific example diagram of the frequency-adaptive track circuit compensation capacitor detection system in this invention, as shown in the figure. Figure 8 As shown, the low-frequency amplifier group L includes amplifier L1 and amplifier L2, and the high-frequency amplifier group H includes amplifier H1 and amplifier H2. Input switch L and output switch L are located two stages before and after the low-frequency amplifier group L, and input switch H and output switch H are located two stages before and after the low-frequency amplifier group H, used for selecting the four amplifiers.

[0079] Compared to Figure 7 Simplified configuration, Figure 8This is the complete configuration of the track circuit compensation capacitor detection system with adaptive detection frequency in this embodiment of the invention. The complete configuration has all the functions of the system, and its detection frequency can be automatically adjusted according to the characteristics of the current detection section. It is suitable for electrical inspection vehicles and comprehensive inspection trains operating throughout the entire railway network. The simplified configuration can eliminate the function of adjusting the frequency according to the characteristics of the section and perform detection at 6 fixed detection frequencies. It is mainly for electrical inspection vehicles operating on certain single lines.

[0080] Finally, the signals are processed by an amplifier to obtain low-frequency detection signals and high-frequency detection signals.

[0081] The system is equipped with two transmitting antennas 604, one high-frequency transmitting antenna and one low-frequency transmitting antenna. After the transmitting antenna is driven, the compensation capacitor reacts, and the receiving antenna 605 receives the compensation capacitor detection signal.

[0082] refer to Figure 7 The system may also include signal conditioning circuits, an AD conversion module, etc. Finally, the data processing module 606 processes the compensation capacitor detection signal and outputs the compensation capacitor detection result. The system may also include a display and analysis interface for displaying and analyzing the compensation capacitor detection data.

[0083] The signal conditioning circuit amplifies and filters the signal detected by the antenna receiving compensation capacitor. The AD conversion module performs AD conversion on the conditioned signal.

[0084] In one embodiment, the compensation capacitor detection signal includes signals of different frequencies; the data processing module 606 is specifically used to: separate the signals of different frequencies in the compensation capacitor detection signal, assign different weights to the signals of different frequencies, perform data fusion, and output the compensation capacitor detection result.

[0085] For example, the data processing module 606 incorporates a digital detection algorithm. Based on the detection frequency of the current section, it separates the effective detection frequencies, calculates their true effective values, and performs data fusion. The output is then displayed on the analysis interface. When assigning weights, the principle that compensation capacitors respond differently to different frequencies under different roadbed conditions is utilized to assign corresponding weight values ​​to signals of different frequencies, and data fusion is then performed.

[0086] In this embodiment of the invention, the candidate detection frequencies in the line database meet the following requirements:

[0087] The frequency required for compensation capacitor detection covering the main detection sections throughout the entire railway line; the main detection sections are: multiple detection sections with a first preset proportion among all detection sections and / or multiple detection sections including a specified track structure throughout the entire railway line.

[0088] The compensation capacitors of most detection sections throughout the entire line have an ideal response effect to the detection frequency in the line database; the majority of detection sections are multiple detection sections with a second preset proportion of all detection sections; the second preset proportion and the first preset proportion can be the same or different, and those skilled in the art can set them according to the actual situation.

[0089] Non-detection targets do not have an ideal response to the detection frequency in the track database; the non-detection targets include metal rods that cross the track.

[0090] For example, based on theoretical calculations and field tests, 10 optimal detection frequencies for the compensation capacitor were determined, denoted as (f1—f10). The selection of candidate detection frequencies from the line database follows these conditions:

[0091] (1) The frequency required for detecting compensation capacitors in major sections such as ballastless track and bridges covering the entire railway area;

[0092] (2) The compensation capacitors present in most sections have a good response effect on one or more of the above frequency points;

[0093] (3) Non-detection targets such as metal rods and steel bars on bridges, roadbeds and tracks have poor overall response to the above frequency points, or at least have very poor response to multiple frequencies.

[0094] (4) The frequencies of signals f1, f2, f3, f4, f5, f6, f7, f8, f9, and f10 increase sequentially.

[0095] For example, the frequency range of signals f1, f2, f3, f4, f5, f6, f7, f8, f9, and f10 can be between 10kHz and 20kHz.

[0096] In this embodiment, the 10 frequency signals are divided into 4 groups, with each high (low) frequency signal group having one frequency downwards (upwards):

[0097] Group 1, Low-frequency backup group: f1, f2;

[0098] The second group, the low-frequency main group: f3, f4, f5, f6;

[0099] The third group, the high-frequency main group: f5, f6, f7, f8;

[0100] The fourth group, the high-frequency backup group: f9, f10.

[0101] For example, amplifier L1 is optimized for detection frequencies f1, f2, f3, and f4; amplifier L2 for detection frequencies f3, f4, f5, and f6; amplifier H1 is optimized for detection frequencies f5, f6, f7, and f8; and amplifier H2 is optimized for detection frequencies f7, f8, f9, and f10. The performance of the low-frequency transmitting antenna is optimized for frequencies f1, f2, f3, f4, f5, and f6. The performance of the high-frequency transmitting antenna is optimized for frequencies f5, f6, f7, f8, f9, and f10.

[0102] The following example, using the detection frequencies of the first to fourth groups, illustrates the generation and processing of multiple detection frequencies corresponding to the current detection segment.

[0103] The first step is to generate the detection frequency.

[0104] Before use, the roadbed conditions and compensation capacitor values ​​for different mileages of the detection line are known. Based on the line database, the system selects 1-3 nearby frequencies from (f1-f6), uses a DDS generator to generate a low-frequency detection signal, and then uses a low-frequency amplification circuit to drive the low-frequency transmitting antenna. Simultaneously, it selects 1-3 nearby frequencies from (f5-f10), uses a DDS generator to generate a high-frequency detection signal, and then uses a high-frequency amplification circuit to drive the high-frequency transmitting antenna.

[0105] For example, under normal conditions, the low-frequency detection signal is formed by the aliasing of (f3, f4, f5) and the high-frequency detection signal is formed by the aliasing of (f6, f7, f8), which drive the two transmitting antennas respectively.

[0106] For example, in certain special sections, a low-frequency backup group f2 is introduced, and (f2, f3, f4) are mixed to form a low-frequency signal, and (f5, f6, f7) are mixed to form a high-frequency signal, so as to improve the detection effect.

[0107] Figure 7 The system shown is a simplified configuration system. For the simplified configuration system, six fixed detection frequencies can be used.

[0108] The second step is to detect the frequency transmission.

[0109] To ensure detection performance, the system comprises two groups of amplifiers: low-frequency (L) and high-frequency (H), with two amplifiers in each group. The four amplifiers are selected via an input / output switching circuit. Specifically, amplifier L1 is optimized for detection frequencies f1, f2, f3, and f4; amplifier L2 for f3, f4, f5, and f6; amplifier H1 for f5, f6, f7, and f8; and amplifier H2 for f7, f8, f9, and f10.

[0110] Figure 9This is a schematic diagram of the antenna arrangement of the adaptive track circuit compensation capacitor detection system in an embodiment of the present invention, as shown below. Figure 9 As shown, the capacitance detection system is deployed between the two bogies under the car, with the rails and the front and rear wheelsets forming a closed loop. Due to space constraints under the car, and to facilitate the modification of existing inspection trains, two transmitting antennas are still installed. Each transmitting antenna includes one high-frequency and one low-frequency antenna. The performance of the low-frequency antenna is optimized for frequencies f1, f2, f3, f4, f5, and f6. The performance of the high-frequency antenna is optimized for frequencies f5, f6, f7, f8, f9, and f10, to obtain the best output performance.

[0111] The third step is to test the frequency reception.

[0112] After the compensation capacitor enters the detection circuit, the current flowing through it is perpendicular to the rail, thus generating an alternating magnetic field. As the capacitor moves relative to the rail in the circuit, the receiving antenna receives this change in magnetic flux, generating an induced electromotive force. The magnetic flux density modulus distribution of the compensation capacitor detection system, simulated by software, can be found in [reference needed]. Figure 10 , Figure 10 This is the magnetic flux density modulus distribution of the compensation capacitor detection system simulated by software in an embodiment of the present invention.

[0113] The receiving antenna receives the detection signal, which is amplified and filtered by the signal conditioning circuit, then converted by an analog-to-digital converter (AD) and sent to the data processing module.

[0114] The fourth step is to process the detection frequency.

[0115] The data processing module receives detection data from the AD conversion module. Based on the detection frequency configured in the database, it uses digital signal processing technology to separate the signals at each frequency. True RMS values ​​are calculated, followed by data fusion, and the results are output to the display and analysis interface.

[0116] Figure 11 As shown in Figure 11, the transmitting and receiving antennas in this embodiment of the invention include a core and an enameled wire. The long side of the magnetic core is parallel to the direction of the rail, which can better receive changes in magnetic flux parallel to the rail and reduce magnetic field interference generated by the rail itself.

[0117] To improve the detection effect and accuracy of the compensation capacitor, the strength of the detection signal can be increased, which is beneficial for improving the signal-to-noise ratio of the received signal. However, due to limitations such as vehicle body conditions and cable withstand voltage requirements, the transmission power cannot be increased indefinitely. Since the centerline of the antenna core is aligned with the horizontal plane, the magnetic field generated by the antenna can be divided into upper and lower parts, with the horizontal plane as the boundary. Because the compensation capacitor is installed below the antenna, only the magnetic field below the horizontal plane is a valid signal for compensation capacitor detection. The energy above the horizontal plane is, in fact, wasted. Figure 12 , Figure 12 The magnetic field distribution of the transmitting antenna in the first example diagram of the present invention is divided by the antenna core, forming ineffective magnetic field lines and effective magnetic field lines. When the intensity of the detection signal is increased, 50% of the detection signal will be wasted.

[0118] Figure 13 This is a second example diagram of a transmitting and receiving antenna in an embodiment of the present invention. The transmitting antenna includes an iron core and a winding surrounding the iron core. The length, thickness, and material of the antenna iron core are... Figure 11 The central antenna remains consistent, and the overall transmitting antenna is arc-shaped with an included angle between the two end faces of the antenna. Spend.

[0119] Figure 14 This is a schematic diagram comparing the magnetic field line distribution of two antennas in an embodiment of the present invention. On the left, since the transmitting antenna core is arranged horizontally, the magnetic field above and below the antenna center plane is almost the same. On the right, the antenna body is arc-shaped, which induces the magnetic field lines to concentrate downward.

[0120] Figure 15 This is a schematic diagram of the transmitting and receiving antenna housing in an embodiment of the present invention, as shown below. Figure 15 As shown, the locations of the iron core 1 and the antenna winding 3 are illustrated. A non-metallic (nylon) nylon shell 2 is installed outside the antenna. The nylon shell 2 has six M8 screw holes for mounting the transmitting antenna. An aviation connector is also provided on the nylon shell 2 for transmitting detection signals to the coil winding.

[0121] In summary, the adaptive detection frequency track circuit compensation capacitor detection system in this embodiment of the invention has multiple preset detection frequencies, covering the detection needs of most line compensation capacitors. In use, based on the known line conditions, the system determines the line condition according to the database, automatically selects one or more preset detection frequencies, and uses DDS technology to cascade them together. After amplification, these frequencies drive two detection antennas (the detection signals of the two antennas can be the same or different).

[0122] After the detection signal is processed by the compensation capacitor, it is acquired, conditioned, and converted by the receiving antenna. The data processing module separates the signals of different frequencies, and based on the principle that the compensation capacitor responds differently to different frequencies under different roadbed conditions, it assigns corresponding weights to the signals of different frequencies and performs data fusion.

[0123] Building upon this, the design of the transmitting antenna was improved to concentrate the magnetic field signal downwards. This resulted in a greater detection magnetic field strength for a given input energy.

[0124] The embodiments of the present invention solve the problems existing in the existing compensation capacitor detection system, such as co-frequency interference, interference from non-detection targets, large differences in the response of compensation capacitors with different capacitance values ​​to the detection signal, the influence of different roadbeds on the magnetic field formed by the detection signal, and the waste of detection signal power. The invention achieves the technical effect of reducing the application cost of electrical inspection vehicles and improving detection efficiency.

[0125] This invention also provides a method for detecting the compensation capacitor of a track circuit with adaptive detection frequency, as described in the following embodiments. This method is applicable to the track circuit compensation capacitor detection system with adaptive detection frequency based on this invention. Since the principle behind this method is similar to that of the track circuit compensation capacitor detection system with adaptive detection frequency, the implementation of this method can be found in the implementation of that system, and repeated details will not be elaborated further.

[0126] Figure 16 This is a flowchart illustrating the detection method for the adaptive track circuit compensation capacitor in an embodiment of the present invention, as shown below. Figure 16 As shown, this method is based on a detection frequency adaptive track circuit compensation capacitor detection system, and the method includes:

[0127] Step 1601: Obtain the current detection segment, and match multiple detection frequencies corresponding to the current detection segment from the line database based on the current detection segment;

[0128] Step 1602: Generate low-frequency aliasing signals and high-frequency aliasing signals using multiple detection frequencies corresponding to the current detection segment;

[0129] Step 1603: Optimize the low-frequency aliasing signal and the high-frequency aliasing signal respectively to generate a low-frequency detection signal and a high-frequency detection signal; the low-frequency detection signal and the high-frequency detection signal are used to drive two transmitting antennas respectively, and the receiving antenna receives the compensation capacitor detection signal;

[0130] Step 1604: Process the compensation capacitor detection signal and output the compensation capacitor detection result.

[0131] In one embodiment, the line database includes a low-frequency group and a high-frequency group; the low-frequency group includes a low-frequency backup group and a low-frequency primary group; the high-frequency group includes a high-frequency backup group and a high-frequency primary group.

[0132] Each low-frequency group includes multiple low-frequency detection frequencies, and each high-frequency group includes multiple high-frequency detection frequencies.

[0133] In one embodiment, matching multiple detection frequencies corresponding to the current detection segment from the line database based on the current detection segment includes: matching multiple low-frequency detection frequencies and multiple high-frequency detection frequencies corresponding to the current detection segment from the line database based on the current detection segment;

[0134] Generating low-frequency aliasing signals and high-frequency aliasing signals using multiple detection frequencies corresponding to the current detection segment includes: generating low-frequency aliasing signals using multiple low-frequency detection frequencies corresponding to the current detection segment, and generating high-frequency aliasing signals using multiple high-frequency detection frequencies corresponding to the current detection segment.

[0135] In one embodiment, the amplifier includes a low-frequency amplifier group and a high-frequency amplifier group; the low-frequency amplifier group includes two low-frequency amplifiers, and the high-frequency amplifier group includes two high-frequency amplifiers.

[0136] In one embodiment, the compensation capacitor detection signal includes signals of different frequencies;

[0137] The compensation capacitor detection signal is processed and the compensation capacitor detection result is output. This process includes: separating signals of different frequencies in the compensation capacitor detection signal, assigning different weights to the signals of different frequencies, fusing the data, and outputting the compensation capacitor detection result.

[0138] In one embodiment, the candidate detection frequencies in the line database meet the following requirements:

[0139] The frequency required for compensation capacitor detection covering the main detection sections throughout the entire railway line; the main detection sections are multiple detection sections within the entire railway line that represent a first preset percentage, and / or include multiple detection sections of a specified track structure.

[0140] The compensation capacitors of most detection sections throughout the entire line have an ideal response effect to the detection frequency in the line database; the majority of detection sections are multiple detection sections that account for a second preset proportion of all detection sections.

[0141] Non-detection targets do not have an ideal response to the detection frequency in the track database; the non-detection targets include metal rods that cross the track.

[0142] In one embodiment, the transmitting antenna includes an iron core and a winding surrounding the iron core, and the transmitting antenna is generally arc-shaped.

[0143] In one embodiment, the method further includes configuring the system's operating mode and / or maintaining the line database; the operating mode includes multiple parameters that support the operation of the system.

[0144] This invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described detection frequency adaptive track circuit compensation capacitor detection method.

[0145] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described detection frequency adaptive track circuit compensation capacitor detection method.

[0146] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the above-described detection frequency adaptive track circuit compensation capacitor detection method.

[0147] The adaptive track circuit compensation capacitor detection system in this embodiment of the invention has multiple preset alternative detection frequencies, covering the detection needs of compensation capacitors for most lines. In use, based on known line conditions, multiple detection frequencies are automatically selected from the line database, generating low-frequency aliasing signals and high-frequency aliasing signals. After amplifier optimization, these signals drive two transmitting antennas respectively. After the compensation capacitor responds, the signals are collected by the receiving antenna, processed by the data processing module, and the compensation capacitor detection results are output. The alternative detection frequency matching and subsequent processing for each detection section of the compensation capacitor obtained through field experiments in this embodiment of the invention can reduce interference from co-frequency signals, non-detection target interference, and roadbed interference in compensation capacitor detection, reduce the adverse effects of differences in compensation capacitor values, and improve the detection efficiency of compensation capacitors.

[0148] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0149] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0150] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0151] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0152] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A frequency-adaptive track circuit compensation capacitor detection system, characterized in that, include: The system includes a frequency matching module, a control unit, an amplifier, two transmitting antennas, a receiving antenna, and a data processing module. The detection frequency matching module is used to: obtain the current detection segment, match multiple detection frequencies corresponding to the current detection segment from the line database based on the current detection segment, and send the multiple detection frequencies corresponding to the current detection segment to the control unit; the line database includes candidate detection frequencies for compensation capacitors of each detection segment obtained in advance through field tests; the candidate detection frequencies include multiple detection frequencies from low to high; The control unit is used to: receive multiple detection frequencies corresponding to the current detection segment, and generate low-frequency aliasing signals and high-frequency aliasing signals using the multiple detection frequencies corresponding to the current detection segment; The amplifier is used to optimize low-frequency aliasing signals and high-frequency aliasing signals respectively, and generate low-frequency detection signals and high-frequency detection signals; The low-frequency detection signal and the high-frequency detection signal are used to drive the two transmitting antennas respectively, and the receiving antenna receives the compensation capacitor detection signal. The data processing module is used to process the compensation capacitor detection signal and output the compensation capacitor detection result.

2. The detection frequency adaptive track circuit compensation capacitor detection system as described in claim 1, characterized in that, The line database includes low-frequency groups and high-frequency groups; the low-frequency groups include low-frequency backup groups and low-frequency primary groups; the high-frequency groups include high-frequency backup groups and high-frequency primary groups. Each low-frequency group includes multiple low-frequency detection frequencies, and each high-frequency group includes multiple high-frequency detection frequencies.

3. The detection frequency adaptive track circuit compensation capacitor detection system as described in claim 2, characterized in that, The detection frequency matching module is specifically used for: Based on the current detection section, multiple low-frequency detection frequencies and multiple high-frequency detection frequencies corresponding to the current detection section are obtained from the line database. The control unit is specifically used to: generate a low-frequency aliasing signal using multiple low-frequency detection frequencies corresponding to the current detection segment, and generate a high-frequency aliasing signal using multiple high-frequency detection frequencies corresponding to the current detection segment.

4. The detection frequency adaptive track circuit compensation capacitor detection system as described in claim 3, characterized in that, The amplifier includes a low-frequency amplifier group and a high-frequency amplifier group; the low-frequency amplifier group includes two low-frequency amplifiers, and the high-frequency amplifier group includes two high-frequency amplifiers.

5. The detection frequency adaptive track circuit compensation capacitor detection system as described in claim 3, characterized in that, The compensation capacitor detection signal includes signals of different frequencies; The data processing module is specifically used to: separate signals of different frequencies in the compensation capacitor detection signal, assign different weights to the signals of different frequencies, perform data fusion, and output the compensation capacitor detection result.

6. The detection frequency adaptive track circuit compensation capacitor detection system as described in any one of claims 1 to 5, characterized in that, The candidate detection frequencies in the line database must meet the following requirements: The frequency required for compensation capacitor detection covering the main detection sections throughout the entire railway line; the main detection sections are multiple detection sections within the entire railway line that represent a first preset percentage, and / or include multiple detection sections of a specified track structure. The compensation capacitors of most detection sections throughout the entire line have an ideal response effect to the detection frequency in the line database; the majority of detection sections are multiple detection sections that account for a second preset proportion of all detection sections. Non-detection targets do not have an ideal response to the detection frequency in the track database; the non-detection targets include metal rods that cross the track.

7. The detection frequency adaptive track circuit compensation capacitor detection system as described in claim 1, characterized in that, The transmitting antenna includes an iron core and a winding surrounding the iron core, and the transmitting antenna is generally arc-shaped.

8. The detection frequency adaptive track circuit compensation capacitor detection system as described in claim 1, characterized in that, It also includes a configuration interface; The configuration interface is used to: configure the system's operating mode and / or maintain the line database; the operating mode includes multiple parameters that support the operation of the system.

9. A method for detecting the compensation capacitor of a track circuit with adaptive detection frequency, characterized in that, The method includes: Obtain the current detection segment, and match multiple detection frequencies corresponding to the current detection segment from the line database based on the current detection segment; Low-frequency aliasing signals and high-frequency aliasing signals are generated using multiple detection frequencies corresponding to the current detection segment; The low-frequency aliasing signal and the high-frequency aliasing signal are optimized respectively to generate a low-frequency detection signal and a high-frequency detection signal. The low-frequency detection signal and the high-frequency detection signal are used to drive two transmitting antennas respectively, and the receiving antenna receives the compensation capacitor detection signal. The compensation capacitor detection signal is processed, and the compensation capacitor detection result is output.

10. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method of claim 9.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method of claim 9.

12. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method of claim 9.

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