Fully electronic receiving method, circuit, and system for alternating current continuous track circuit

Abstract

The present invention relates to the technical field of rail transit, and in particular to a fully electronic receiving method, circuit, and system for an alternating current continuous track circuit. The method comprises: adjusting track signals in a track circuit; sampling the adjusted track signals according to a preset sampling rate; demodulating the sampled track signals, and determining the track state on the basis of the demodulation result; and processing the track state, and uploading the processed final track state. The present invention can adapt to original track circuit environments, and the modification cost is low; moreover, the interface board in the present invention has transverse and longitudinal lightning protection functions; the present invention has high safety.

Description

A fully electronic receiving method, circuit and system for AC continuous track circuit

[0001] This application claims priority to Chinese Patent Application No. 202410017641.1 filed on January 5, 2024, and the contents of the above-mentioned Chinese patent application disclosure are hereby incorporated by reference in their entirety as a part of this application. Technical Field

[0002] The present invention belongs to the field of rail transportation technology, and in particular relates to an AC continuous track circuit full-electronic receiving method, circuit and system. Background Art

[0003] A 50Hz AC continuous track circuit is a track circuit used in railway sections and stations in non-AC electric traction areas to monitor the idle / occupied status of the section. Traditional 50Hz AC continuous track circuits use JZXC-480 relays at the receiving end, which have disadvantages such as low branch sensitivity, poor lightning protection performance, and easy contact blocking.

[0004] Summary of the Invention

[0005] In view of the above problems, the present invention provides an all-electronic receiving method for an AC continuous track circuit, the method comprising:

[0006] Adjust the track signal in the track circuit;

[0007] Sampling the adjusted track signal according to a preset sampling rate;

[0008] Demodulate the sampled track signal and determine the track status based on the demodulation result;

[0009] Process the track status and upload the final track status after processing.

[0010] Preferably, before adjusting the track signal, the impedance of the track signal transmission inlet needs to be stabilized.

[0011] Preferably, before stabilizing the impedance of the track signal transmission entrance, the method further comprises:

[0012] Provide lateral protection for the receiving terminal voltage of the track circuit;

[0013] Provide disconnection protection for track signal circuits;

[0014] Provide longitudinal protection for the receiving terminal voltage of the track circuit.

[0015] Preferably, the adjusting of the track signal in the track circuit includes: sequentially conditioning the track signal, adding a DC bias and performing low-pass filtering.

[0016] Preferably, judging the track state according to the demodulation result includes:

[0017] When the track receiving terminal voltage is greater than the pickup threshold, the track state is judged to be idle;

[0018] When the track receiving terminal voltage is less than the drop threshold, the track status is judged to be occupied.

[0019] Preferably, after determining the track state according to the demodulation result, the method further includes:

[0020] Perform self-inspections on key parts of track circuits and collect corresponding maintenance information.

[0021] Preferably, processing the track state according to the judgment result includes: performing an AND operation or an OR operation on the track state.

[0022] The present invention also proposes an AC continuous track circuit fully electronic receiving circuit, the receiving circuit comprising a power transmitting end and a power receiving end, the power transmitting end and the power receiving end being connected via a steel rail, the power receiving end being connected to a fully electronic receiving module, the fully electronic receiving module comprising a processing board and a communication board;

[0023] The processing board includes an impedance matching circuit, a signal adjustment circuit, a sampling circuit, a first CPU circuit and a first communication circuit;

[0024] The communication board includes a second CPU circuit and a second communication circuit.

[0025] Preferably, the processing plate comprises a processing plate series I and a processing plate series II, wherein the processing plate series I and the processing plate series II are connected in parallel;

[0026] The communication board includes a communication board series I and a communication board series II, wherein the communication board series I and the communication board series II are connected in parallel;

[0027] The processing board I series is connected to the communication board I series and the communication board II series respectively, and the processing board II series is connected to the communication board I series and the communication board II series respectively.

[0028] Preferably, the all-electronic receiving module further comprises an interface board;

[0029] The interface board includes a voltage protection circuit, an impedance matching circuit and an isolation transformer circuit;

[0030] The interface board is connected to the processing board.

[0031] The present invention also provides an AC continuous track circuit fully electronic receiving system, the system comprising a processing module and a communication module;

[0032] The processing module includes an adjustment unit, a sampling unit and a demodulation unit, and the communication module includes a communication unit;

[0033] The adjustment unit is used to adjust the track signal in the track circuit;

[0034] The sampling unit is used to sample the adjusted track signal according to a preset sampling rate;

[0035] The demodulation unit is used to demodulate the sampled track signal and determine the track status according to the demodulation result;

[0036] The communication unit is used to process the track state and upload the final track state after processing.

[0037] Preferably, the system further comprises a stabilization module;

[0038] The stabilization module includes a transverse protection unit, a line break protection unit and a longitudinal protection unit;

[0039] The transverse protection unit is used to provide transverse protection for the receiving end voltage of the track circuit;

[0040] The line break protection unit is used to protect the track signal circuit from line break;

[0041] The longitudinal protection unit is used to provide longitudinal protection for the receiving end voltage of the track circuit.

[0042] The present invention has the following beneficial effects:

[0043] (1) The present invention can adapt to the existing track circuit environment, with low modification cost, and the interface board of the present invention has horizontal and vertical lightning protection functions, and is highly safe;

[0044] (2) The present invention has no relay contacts and can collect track signals redundantly. If any system is unplugged or fails, it will not affect the output status of the other system, thus realizing safe collection of track signals, safe judgment of track status and safe uploading, with high security.

[0045] (3) The present invention has a simple structure, less wiring, small footprint, and low maintenance workload, and complies with the railway fault-safety principle and meets SIL4 safety requirements.

[0046] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] FIG1 shows a diagram of a fully electronic receiving method for an AC continuous track circuit according to an embodiment of the present invention;

[0049] FIG2 shows a fully electronic receiving circuit diagram of an AC continuous track circuit according to an embodiment of the present invention;

[0050] FIG3 shows an internal connection diagram of a fully electronic receiving module according to an embodiment of the present invention;

[0051] FIG4 shows an internal block diagram of an interface board according to an embodiment of the present invention;

[0052] FIG5 shows an internal block diagram of a single-system processing board according to an embodiment of the present invention;

[0053] FIG6 shows an internal block diagram of a single-system communication board according to an embodiment of the present invention;

[0054] FIG7 shows a diagram of a fully electronic receiving system for an AC continuous track circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0055] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present disclosure will be more comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced while omitting one or more of the specific details, or that other methods, components, devices, steps, etc. may be employed. In other cases, well-known technical solutions are not shown or described in detail to avoid obscuring various aspects of the present disclosure.

[0056] In addition, the accompanying drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. Identical reference numerals in the figures denote identical or similar parts, and thus repetitive descriptions thereof will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities that do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in software, in one or more hardware units or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0057] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all steps. For example, some steps may be decomposed, while some steps may be combined or partially combined, so the actual execution order may change according to actual circumstances.

[0058] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the application described herein can, for example, be implemented in an order other than that illustrated or described herein.

[0059] In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or submodules is not necessarily limited to those steps or submodules explicitly listed, but may include other steps or submodules not explicitly listed or inherent to such process, method, product or apparatus.

[0060] The AC continuous track adopted in the present invention is a 50Hz AC continuous track circuit.

[0061] As shown in FIG1 , the present invention proposes a method for fully electronically receiving an AC continuous track circuit, the method comprising the following steps:

[0062] S1 adjusts the track signal in the track circuit;

[0063] Before adjusting the track signal, it is also necessary to stabilize the impedance of the track signal transmission entrance.

[0064] Before stabilizing the impedance of the track signal transmission entrance, the method further includes: performing horizontal protection on the receiving end voltage of the track circuit; performing line break protection on the track signal circuit; and performing longitudinal protection on the receiving end voltage of the track circuit.

[0065] The adjusting of the track signal in the track circuit includes: conditioning the track signal in sequence, adding a DC bias and performing low-pass filtering.

[0066] S2 samples the adjusted track signal according to a preset sampling rate;

[0067] S3 demodulates the sampled track signal and determines the track status based on the demodulation result;

[0068] The determining of the track state according to the demodulation result includes: determining that the track state is idle when the track receiving end voltage is greater than the pickup threshold; and determining that the track state is occupied when the track receiving end voltage is less than the drop threshold.

[0069] The processing of the track state according to the judgment result includes: performing an AND operation or an OR operation on the track state.

[0070] After determining the track status based on the demodulation results, the system also includes: performing a self-inspection on key parts of the track circuit and collecting relevant maintenance information. In this embodiment, the key parts are located in the track circuit's fully electronic receiving module, including CPU registers, CPU data RAM area, CPU program ROM area, power supply, clock, communication status, stack overflow, software running status, etc.

[0071] S4 processes the track status and uploads the final track status after processing.

[0072] As shown in Figure 2, the present invention also proposes an AC continuous track circuit all-electronic receiving circuit, the receiving circuit includes a power sending end and a power receiving end, the power sending end and the power receiving end are connected by a rail, the power receiving end is connected to a all-electronic receiving module, the all-electronic receiving module includes an interface board, a processing board and a communication board, the interface board is connected to the processing board, the processing board is connected to the communication board through a field bus, and the communication board is connected to the interlocking logic unit and the maintenance machine through Ethernet.

[0073] As shown in Figure 3, the interface board includes a voltage protection circuit, an impedance matching circuit, and an isolation transformer circuit; the processing board includes an impedance matching circuit, a signal conditioning circuit, a sampling circuit, a first CPU circuit, and a first communication circuit; and the communication board includes a second CPU circuit and a second communication circuit. The interface board is a single-system board, while the processing board and communication board are dual-system boards, each forming a 2x2-out-of-2 architecture.

[0074] As shown in Figure 4, the interface board consists of a voltage protection circuit RV, an impedance matching circuit R1-R6, and an isolation transformer circuit T.

[0075] The voltage protection circuit RV is a varistor that provides lateral protection for the receiving voltage of the track circuit. When the receiving voltage is greater than the maximum voltage of the varistor, the varistor will be turned on, thereby protecting the subsequent circuits.

[0076] The impedance matching circuit R1-R6 consists of six four-terminal resistors connected in parallel, which are consistent with the input impedance of the JZXC-480 relay. The use of four-terminal resistors also has an anti-disconnection function. When a resistor is disconnected, the connection with the subsequent circuit will be cut off, thereby protecting the system from generating dangerous outputs.

[0077] The isolation transformer circuit T is a high-impedance, lightning-proof step-down transformer that provides longitudinal protection for the track circuit's receiving-end voltage. The transformer's secondary side has two coils, which output to the I and II series of the processing board, respectively. Each interface board can support six track signal inputs.

[0078] As shown in Figure 5, a single-system processing board adopts a 2-out-of-2 structure. Taking the processing board system I as an example, the processing board system I is composed of an impedance matching circuit, a signal adjustment circuit, a sampling circuit, a first CPU circuit, and a first communication circuit.

[0079] The impedance matching circuit can stabilize the input impedance of the processing board, realize dual-system safe redundant acquisition and reduce interference;

[0080] The signal conditioning circuit conditions the track signal input from the interface board, adds DC bias, and performs low-pass filtering to meet the needs of the sampling circuit;

[0081] The sampling circuit samples the track signal at a certain sampling rate and transmits the result to the CPU circuit;

[0082] The first CPU circuit demodulates the track signal and determines the idle / occupied state of the track based on the demodulation result. It also performs self-inspection on key parts and collects relevant maintenance information.

[0083] The first communication circuit realizes the communication between the processing board and the communication board and the communication between the dual CPUs of the processing board. The communication between the processing board and the communication board adopts the CAN bus. The processing board uploads the track status and maintenance information to the communication board. The communication between the dual CPUs of the processing board adopts serial communication to realize the interaction of dual CPU data and complete the two-step processing.

[0084] Furthermore, the signal conditioning circuit, sampling circuit, and first CPU circuit are two independent circuits. Changes in circuit parameters are detected through a two-way comparison of analog values ​​between the two CPUs, ensuring secure acquisition of track signals. Simultaneously, the two CPUs perform a two-way comparison of track status to ensure accurate judgment of track status. The first communication circuit also utilizes two CAN bus communications, connected to communication boards I and II, respectively, to ensure secure upload of track status. Each processing board can process 12 track signals and ultimately output the status of 12 track sections.

[0085] As shown in Figure 6, a single-system communication board has a 2-out-of-2 structure. Taking the communication board system I as an example, the communication board system I consists of a second CPU circuit and a second communication circuit.

[0086] The second CPU circuit receives data from the processing board through the second communication circuit, processes the track status of the processing board ("AND" operation between single-system dual CPUs, "OR" operation between dual systems), again ensuring accurate judgment of the track status, and uploads the track status to the interlocking logic part via the second communication circuit control network. At the same time, it performs self-inspection on key parts, collects corresponding maintenance data, and packages it together with the maintenance information of the processing board, and uploads it to the maintenance machine via the second communication circuit maintenance network.

[0087] The second communication circuit includes communication with the processing board, communication with the interlocking logic unit and maintenance machine, communication between CPUs, and communication between two systems. Communication with the processing board uses the CAN bus, communication with the interlocking logic unit and maintenance machine uses Ethernet, and communication between CPUs and between two systems uses the FlexRay bus. Each communication board can output the status of 24 track sections.

[0088] Specifically, the communication board I system in this embodiment contains two second CPU circuits and two second communication circuits, one of which is connected to the processing board I system, and is connected to the interlocking logic part I system through the control network A, and is connected to the maintenance machine through the maintenance network A. The other second communication circuit is connected to the processing board II system, and is connected to the interlocking logic part II system through the control network B, and is connected to the maintenance machine through the maintenance network B.

[0089] As shown in FIG. 7 , the present invention further proposes an AC continuous track circuit fully electronic receiving system, which includes a stabilization module 10 , a processing module 20 and a communication module 30 .

[0090] The stabilization module 10 includes a transverse protection unit 101, a line break protection unit 102 and a longitudinal protection unit 103, wherein:

[0091] The transverse protection unit 101 is used to provide transverse protection for the receiving end voltage of the track circuit;

[0092] The line break protection unit 102 is used to protect the track signal circuit from line break;

[0093] The longitudinal protection unit 103 is used to provide longitudinal protection for the receiving end voltage of the track circuit.

[0094] The processing module 20 includes an adjustment unit 201, a sampling unit 202 and a demodulation unit 203, wherein:

[0095] The adjustment unit 201 is used to adjust the track signal in the track circuit;

[0096] The sampling unit 202 is used to sample the adjusted track signal according to a preset sampling rate;

[0097] The demodulation unit 203 is used to demodulate the sampled track signal and determine the track status according to the demodulation result.

[0098] The communication module 30 includes a communication unit 301, wherein:

[0099] The communication unit 301 is used to process the track status and upload the final track status after processing.

[0100] Those skilled in the art should understand that although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A full-electronic receiving method for an AC continuous track circuit, characterized in that, The method includes: Adjust the track signal in the track circuit; Sample the adjusted track signal at a preset sampling rate; Demodulate the sampled track signal and judge the track state according to the demodulation result; Process the track state and upload the final processed track state.

2. The full-electronic receiving method for an AC continuous track circuit according to claim 1, characterized in that: Before adjusting the track signal, it is also necessary to stabilize the impedance of the track signal transmission inlet.

3. The full-electronic receiving method for an AC continuous track circuit according to claim 2, characterized in that: Before stabilizing the impedance of the track signal transmission inlet, it further includes: Conduct lateral protection on the receiving-end voltage of the track circuit; Conduct disconnection protection on the track signal circuit; Conduct longitudinal protection on the receiving-end voltage of the track circuit.

4. The full-electronic receiving method for an AC continuous track circuit according to claim 1, characterized in that: Adjusting the track signal in the track circuit includes: successively conditioning the track signal, adding a DC bias, and performing low-pass filtering.

5. The full-electronic receiving method for an AC continuous track circuit according to claim 1, characterized in that: Judging the track state according to the demodulation result includes: When the receiving-end voltage of the track is greater than the pickup threshold, judge that the track state is idle; When the receiving-end voltage of the track is less than the drop threshold, judge that the track state is occupied.

6. The full-electronic receiving method for an AC continuous track circuit according to claim 1, characterized in that: After judging the track state according to the demodulation result, it further includes: Self-check the key parts of the track circuit and collect corresponding maintenance information.

7. The full-electronic receiving method for an AC continuous track circuit according to claim 1, characterized in that: Processing the track state according to the judgment result includes: performing AND operation processing or OR operation processing on the track state.

8. An all-electronic receiving circuit for an AC continuous track circuit, the receiving circuit comprising a power sending end and a power receiving end, the power sending end and the power receiving end being connected by a rail, characterized in that, The receiving end is connected with a full-electronic receiving module, and the full-electronic receiving module includes a processing board and a communication board; The processing board includes an impedance matching circuit, a signal adjustment circuit, a sampling circuit, a first CPU circuit, and a first communication circuit; The communication board includes a second CPU circuit and a second communication circuit.

9. The full-electronic receiving circuit for an AC continuous track circuit according to claim 8, characterized in that: The processing board includes a processing board series I and a processing board series II, and the processing board series I and the processing board series II are in parallel; The communication board includes a communication board series I and a communication board series II, and the communication board series I and the communication board series II are in parallel; The processing board series I is respectively connected to the communication board series I and the communication board series II, and the processing board series II is respectively connected to the communication board series I and the communication board series II.

10. The all-electronic receiving circuit of the AC continuous track circuit according to claim 8, characterized in that The full-electronic receiving module further includes an interface board; The interface board includes a voltage protection circuit, an impedance matching circuit, and an isolation transformer circuit; The interface board is connected to the processing board.

11. A full-electronic receiving system for an AC continuous track circuit, characterized in that, The system includes a processing module and a communication module; The processing module includes an adjustment unit, a sampling unit, and a demodulation unit, and the communication module includes a communication unit; The adjustment unit is used to adjust the track signal in the track circuit; The sampling unit is used to sample the adjusted track signal at a preset sampling rate; The demodulation unit is used to demodulate the sampled track signal and judge the track state according to the demodulation result; The communication unit is used to process the track state and upload the final processed track state; 12. The all-electronic receiving system for AC continuous track circuit according to claim 11, wherein, The system further includes a stabilization module; The stabilization module includes a lateral protection unit, a broken wire protection unit, and a longitudinal protection unit; The lateral protection unit is used to perform lateral protection on the receiving-end voltage of the track circuit; The broken wire protection unit is used to protect against broken wires in the track signal circuit; The longitudinal protection unit is used to perform longitudinal protection on the receiving-end voltage of the track circuit.

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