Method, device and system for monitoring the state of a track section based on an optical fiber sensor

Abstract

The present invention discloses a method, device and system for monitoring the state of a track section based on an optical fiber sensor, belonging to the field of rail transit. The method for monitoring the state of a track section includes: obtaining the detection result of the optical fiber sensor in the detection unit, where the optical fiber sensor is used to detect the axle number information of a train; determining the state of the detection unit according to the detection result of the optical fiber sensor; determining the state of the track section according to the states of the detection units at the entrance and exit of the track section; wherein, detection units are provided at the demarcation points between adjacent track sections, the entrance of the first track section, and the exit of the last track section. The present invention can also perform accurate detection in the case of failure of some sensors, improving the usability.

Description

Technical Field

[0001] The present invention belongs to the field of rail transit, and particularly relates to a method, device and system for monitoring the state of a track section based on an optical fiber sensor. Background Art

[0002] The axle counting system is one of the most commonly used systems for monitoring the state of a track section at present. However, due to limited conditions, the following difficulties of the axle counting system are not easy to solve:

[0003] (1) The availability of the system is relatively low. For example, one electromagnetic sensor is usually installed at the single-end detection point of the detected track section. After being affected by the climate environment and electromagnetic environment, it is likely to have a great impact on the train operation efficiency.

[0004] (2) The safety of the system is relatively low. For example, when the equipment at the single-end detection point falls off as a whole or a dangerous-side failure occurs, the wheel sensor cannot detect the train wheel signal. Due to the lack of detection and determination of other conditions, it will lead to serious safety consequences such as "runaway train".

[0005] (3) The maintainability of the system is relatively low. For example, when a single detection point fails temporarily, due to the lack of detection and determination of other conditions, according to the fail-safe principle, the system will output the information that the section is occupied, and corresponding personnel need to deal with it in time to restore the system. Limited by resource conditions, the restoration time is mostly relatively long, which has a great impact on the train operation efficiency. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method, device and system for monitoring the state of a track section based on an optical fiber sensor.

[0007] The purpose of the present invention is achieved by the following technical solutions:

[0008] According to the first aspect of the present invention, a method for monitoring the state of a track section based on an optical fiber sensor includes:

[0009] Obtaining the detection result of the optical fiber sensor in the detection unit, where the optical fiber sensor is used to detect the axle number information of the train;

[0010] Determining the state of the detection unit according to the detection result of the optical fiber sensor;

[0011] Determining the state of the track section according to the states of the detection units at the entrance and exit of the track section;

[0012] Wherein, detection units are provided at the demarcation points between adjacent track sections, the entrance of the first track section, and the exit of the last track section.

[0013] Further, the detection unit includes two groups of optical fiber sensors respectively arranged on two steel rails, and each group of optical fiber sensors includes two optical fiber sensors.

[0014] Further, determining the state of the detection unit according to the train axle number information includes:

[0015] For each detection unit to be judged, judge whether the detection results of the optical fiber sensors in the detection unit to be judged are the same;

[0016] If the detection results of the four optical fiber sensors in the detection unit to be judged are all the same, the detection function of the detection unit to be judged is complete and effective;

[0017] If the detection results of three optical fiber sensors in the detection unit to be judged are the same, the detection function of the detection unit to be judged is complete and effective;

[0018] If the detection results of the four optical fiber sensors in the detection unit to be judged are all different, the detection function of the detection unit to be judged fails.

[0019] Further, determining the state of the detection unit according to the train axle number information includes:

[0020] If only the detection results of two optical fiber sensors in the detection unit to be judged are the same, judge whether the two optical fiber sensors with the same detection results in the detection unit to be judged are on the same steel rail;

[0021] If the two optical fiber sensors with the same detection results in the detection unit to be judged are not on the same steel rail, the detection function of the detection unit to be judged fails;

[0022] If the two optical fiber sensors with the same detection results in the detection unit to be judged are on the same steel rail, obtain the state of the corresponding entrance detection unit when the detection unit to be judged is used as an exit detection unit; the exit detection unit is the detection unit located at the exit of the track section, and the entrance detection unit is the detection unit located at the entrance of the track section;

[0023] If the two optical fiber sensors with the same detection results in the detection unit to be judged are on the same steel rail, judge whether there are other exit detection units in the corresponding track section when the detection unit to be judged is used as an exit detection unit;

[0024] If it is judged that there are other exit detection units in the corresponding track section when the detection unit to be judged is used as an exit detection unit, obtain the states of the other exit detection units;

[0025] If the detection function of the entrance detection unit is effective and there is no signal change in other exit detection units, the detection function of the detection unit to be judged is incomplete but effective;

[0026] If there are no other exit detection units in the track section and the detection function of the entrance detection unit is effective, the detection function of the detection unit to be judged is incomplete but effective.

[0027] Further, determining the status of the track section according to the status of the detection units at the entrance and exit of the track section includes:

[0028] If the detection functions of all the detection units at the entrance and exit of the track section are effective, when a detection unit at the entrance of the track section detects a train, update the status of the track section to the occupied state, and when a detection unit at the exit of the track section detects that the train has completely left, update the status of the track section to the idle state.

[0029] Further, if there is a detection unit with a failed fiber optic sensor among all the detection units at the entrance and exit of the track section, output a first warning message;

[0030] If there are two detection units with failed fiber optic sensors among all the detection units at the entrance and exit of the track section, output a second warning message.

[0031] Further, determining the status of the track section according to the status of the detection units at the entrance and exit of the track section includes:

[0032] When there is a detection unit with a failed detection function among all the detection units at the entrance and exit of the track section, update the status of the track section to the occupied state.

[0033] Further, determining the status of the track section according to the status of the detection units at the entrance and exit of the track section further includes:

[0034] Judge whether there are track sections before and after the track section;

[0035] If there are track sections before and after the track section, merge the track section and the track sections before and after it into a comprehensive track section;

[0036] When there is a detection unit with a failed detection function among all the detection units at the entrance and exit of the track section, judge the status of the comprehensive track section;

[0037] Update the status of the track section according to the status of the comprehensive track section.

[0038] According to a second aspect of the present invention, a track section status monitoring device based on an optical fiber sensor includes:

[0039] A data acquisition module for acquiring the detection results of the optical fiber sensors in the detection unit, where the optical fiber sensors are used to detect the axle number information of the train;

[0040] A first status determination module for determining the status of the detection unit according to the detection results of the optical fiber sensors;

[0041] A second status determination module for determining the status of the track section according to the statuses of the detection units at the entrance and exit of the track section;

[0042] Wherein, detection units are provided at the demarcation points between adjacent track sections, the entrance of the first track section, and the exit of the last track section.

[0043] According to a third aspect of the present invention, a track section status monitoring system based on an optical fiber sensor includes:

[0044] Detection units are provided at the demarcation points between adjacent track sections, the entrance of the first track section, and the exit of the last track section. Each detection unit includes two groups of optical fiber sensors respectively arranged on two steel rails, and each group of optical fiber sensors includes two optical fiber sensors. The optical fiber sensors are used to detect the axle number information of the train;

[0045] A monitoring module for acquiring the detection results of the optical fiber sensors in the detection unit, determining the status of the detection unit according to the detection results of the optical fiber sensors, and determining the status of the track section according to the statuses of the detection units at the entrance and exit of the track section.

[0046] The beneficial effects of the present invention are:

[0047] (1) The present invention first proposes to use optical fiber sensors for track section status monitoring, filling the gap in the application of optical fibers in track section status monitoring technology; the use of optical fiber detection technology can reduce the laying of cables, reducing equipment costs; the installation and maintenance of optical fiber sensors are extremely simple and fast, which can greatly reduce maintenance costs, and at the same time can avoid the influence of information errors caused by electromagnetic interference around the track;

[0048] (2) In the present invention, each detection unit is configured with four optical fiber sensors. Even in the case of partial sensor failures, accurate detection can still be carried out relying on the detection results of the optical fiber sensors with normal detection functions, improving availability and reliability;

[0049] (3) In the present invention, the detection results of the optical fiber sensors on the two steel rails are mutually redundant, which can effectively avoid missed detection and misdetection of train wheels, and has a very high safety performance;

[0050] (4) In the present invention, the faulty fiber optic sensor can be accurately positioned, reducing the labor intensity of maintenance tasks;

[0051] (5) In the present invention, for the track section where the detection unit fails, the track sections before and after this track section are used to judge the state of this track section, reducing the impact of the detection unit failure on the train operation efficiency and improving the availability. Description of the Drawings

[0052] Figure 1 is a flowchart of an embodiment of the method for monitoring the state of a track section in the present invention;

[0053] Figure 2 is a flowchart of an embodiment of determining the state of the detection unit in the present invention;

[0054] Figure 3 is a schematic diagram of an embodiment of the track section state monitoring system in the present invention;

[0055] Figure 4 is a schematic diagram of an embodiment of determining the state of the detection unit in the present invention;

[0056] Figure 5 is a block diagram of the composition of an embodiment of the track section state monitoring device in the present invention;

[0057] Figure 6 is a schematic diagram of the installation of the detection unit in an embodiment of the present invention;

[0058] Figure 7 is a schematic diagram of the installation of the fiber optic sensor in an embodiment of the present invention;

[0059] In the figure, 1 - detection unit, 2 - monitoring module, 3 - section track relay, 4 - reset relay, 5 - fiber optic sensor, 6 - fixture, 7 - sleeper, 8 - rail. Detailed Embodiments

[0060] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0061] Refer to Figures 1 - 7 , this embodiment provides a method, device and system for monitoring the state of a track section based on a fiber optic sensor:

[0062] Such as Figure 1As shown in the figure, the first aspect of the present invention provides a method for monitoring the status of a track section based on an optical fiber sensor. The method for monitoring the status of the track section includes steps S100 to S300, which are described in detail below.

[0063] S100. Obtain the detection result of the optical fiber sensor 5 in the detection unit 1, where the optical fiber sensor 5 is used to detect the axle number information of the train.

[0064] S200. Determine the status of the detection unit 1 according to the detection result of the optical fiber sensor 5.

[0065] In one embodiment, the detection unit 1 includes two groups of optical fiber sensors 5 respectively arranged on two steel rails 8, and each group of optical fiber sensors 5 includes two optical fiber sensors 5.

[0066] Further, determining the status of the detection unit 1 according to the train axle number information includes: for each detection unit 1 to be judged, judge whether the detection results of the optical fiber sensors 5 in the detection unit 1 to be judged are the same; if the detection results of the four optical fiber sensors 5 in the detection unit 1 to be judged are all the same, the detection function of the detection unit 1 to be judged is complete and effective; if the detection results of three optical fiber sensors 5 in the detection unit 1 to be judged are the same, the detection function of the detection unit 1 to be judged is complete and effective, and the other optical fiber sensor 5 with different detection results is faulty; if the detection results of the four optical fiber sensors 5 in the detection unit 1 to be judged are all different, the detection function of the detection unit 1 to be judged fails, and all four optical fiber sensors 5 in the detection unit 1 are faulty.

[0067] It should be noted that for an optical fiber sensor 5, if it detects the axle number information of the train, the axle number information is the detection result of the optical fiber sensor 5; if there is no signal change, the optical fiber sensor 5 will also output a signal as its detection result. For example, the detection results of the four optical fiber sensors 5 in the detection unit 1 to be judged being all the same specifically includes two situations: Situation 1, there is no signal change in the four optical fiber sensors 5 in the detection unit 1; Situation 2, there is signal change in the four optical fiber sensors 5 in the detection unit 1, and the axle number information detected by these four optical fiber sensors 5 is the same.

[0068] Further, as Figure 2 shown, determining the status of the detection unit 1 according to the train axle number information further includes:

[0069] S210. If only the detection results of two fiber optic sensors 5 in the detection unit 1 to be judged are the same, then judge whether the two fiber optic sensors 5 with the same detection results in the detection unit 1 to be judged are located on the same rail 8. If not, execute S220. If so, execute S230 and S240.

[0070] S220. Determine that the detection function of the detection unit 1 to be judged fails. That is, if the two fiber optic sensors 5 with the same detection results in the detection unit 1 to be judged are not located on the same rail 8, then the detection function of the detection unit 1 to be judged fails.

[0071] S230. Obtain the status of the corresponding entrance detection unit 1 when the detection unit 1 to be judged is used as the exit detection unit 1, and then execute S250 and S270. The exit detection unit 1 is the detection unit 1 located at the exit of the track section, and the entrance detection unit 1 is the detection unit 1 located at the entrance of the track section. For example, Figure 3 in the case of the third track section 3G, the third detection unit J3 is the detection unit 1 at its entrance; for the first track section 1G, the third detection unit J3 is the detection unit 1 at its exit; that is, the third detection unit J3 is the entrance detection unit 1 of the third track section 3G, and at the same time the third detection unit J3 is the exit detection unit 1 of the first track section 1G.

[0072] S240. Judge whether there are other exit detection units 1 in the track section corresponding to the detection unit 1 to be judged when it is used as the exit detection unit 1. If not, execute S250. If so, execute S260; that is, judge whether there are multiple exits in the track section corresponding to the detection unit 1 to be judged when it is used as the exit detection unit 1.

[0073] S250. If the detection function of the entrance detection unit 1 is effective, then the detection function of the detection unit 1 to be judged is incomplete but effective. At this time, the other two fiber optic sensors 5 in the detection unit 1 to be judged are faulty.

[0074] S260. Obtain the status of other exit detection units 1, and then execute S270. Other exit detection units 1 are all the remaining exit detection units 1 in all the exit detection units 1 corresponding to the track section except the detection unit 1 to be judged.

[0075] S270. If the detection function of the entrance detection unit 1 is effective and there is no signal change in other exit detection units 1, then the detection function of the detection unit 1 to be judged is incomplete but effective. At this time, the other two fiber optic sensors 5 in the detection unit 1 to be judged are faulty.

[0076] In this embodiment, the faulty fiber optic sensor 5 can be accurately positioned, thus reducing the labor intensity of maintenance tasks.

[0077] S300. Determine the status of the track section according to the status of the detection unit 1 at the entrance and exit of the track section; wherein, detection units 1 are provided at the demarcation points between adjacent track sections, the entrance of the first track section, and the exit of the last track section.

[0078] Generally, the status of the track section includes an occupied status and a free status.

[0079] In one embodiment, determining the status of the track section according to the status of the detection unit 1 at the entrance and exit of the track section includes: if the detection functions of all the detection units 1 at the entrance and exit of the track section are effective, when a train is detected by one of the detection units 1 at the entrance of the track section, update the status of the track section to the occupied status, and at this time, other trains cannot enter this track section; when a train is detected to have completely left by one of the detection units 1 at the exit of the track section, update the status of the track section to the free status, and at this time, other trains are allowed to enter this track section.

[0080] Further, if there is a detection unit 1 with a faulty fiber optic sensor 5 among all the detection units 1 at the entrance and exit of the track section, output a first warning message; if there are two detection units 1 with faulty fiber optic sensors 5 among all the detection units 1 at the entrance and exit of the track section, output a second warning message. Generally, the first warning message is different from the second warning message, which is convenient for the staff to distinguish the urgency of maintenance, etc. In this embodiment, although the detection function of the detection unit 1 is effective, there are still faulty fiber optic sensors 5 in the detection unit 1. In order to improve safety as much as possible, the staff will still be prompted to perform maintenance in a timely manner.

[0081] In one embodiment, determining the status of the track section according to the status of the detection unit 1 at the entrance and exit of the track section includes: when there is a detection unit 1 with a failed detection function among all the detection units 1 at the entrance and exit of the track section, update the status of the track section to the occupied status. That is, as long as one of the detection units 1 among all the detection units 1 at the entrance and exit of the track section has a failed detection function, update the status of the track section to the occupied status to prevent trains from entering this track section again, thus improving safety.

[0082] Further, determining the status of the track section according to the status of the detection unit 1 at the entrance and exit of the track section further includes: when there is a detection unit 1 with a failed detection function among all the detection units 1 at the entrance and exit of the track section, determining whether there are track sections before and after the track section; if there are track sections before and after the track section, merging the track section and the track sections before and after it into a comprehensive track section. At this time, the entrance detection unit or the exit detection unit of this track section becomes the demarcation point detection unit of the comprehensive track section, the entrance detection unit of the previous track section of this track section becomes the entrance detection unit of the comprehensive track section, and the exit detection unit of the subsequent track section of this track section becomes the exit detection unit of the comprehensive track section; determining the status of the comprehensive track section. When any demarcation point detection unit within the comprehensive section fails, the adjacent track section is updated to the occupied state, and when the axle number information of the entrance detection unit, other demarcation point detection units, and the exit detection unit of the comprehensive track section is consistent, the status of the comprehensive track section is updated to the idle state; if the axle number information of the entrance detection unit, other demarcation point detection units, and the exit detection unit of the comprehensive track section is inconsistent, the status of the comprehensive track section remains the occupied state; updating the status of the track section according to the status of the comprehensive track section. In this embodiment, for a track section with a detection unit 1 with a failed detection function, the status of this track section is judged by using the two adjacent track sections before and after this track section, which can minimize the impact of the failure of the detection unit 1.

[0083] In this embodiment, the adjacent multi-detection unit 1 redundancy algorithm is adopted to safely unlock the track section with a failed detection unit 1. In this embodiment, by pre-judging and processing the status of the detection unit 1, the safe unlocking of the failed track section can also be achieved in the case of the failure of some fiber optic sensors 5 or detection units 1, improving the usability of the system.

[0084] As Figure 3 and Figure 4 shown, an example is used to illustrate the method of this embodiment.

[0085] The method for determining the state of the second detection unit J2 is as follows: If the detection results of all four fiber optic sensors 5 in the second detection unit J2 are the same, then the detection function of the second detection unit J2 is complete and effective. If the detection results of three fiber optic sensors 5 in the second detection unit J2 are the same, then the detection function of the second detection unit J2 is complete and effective, and the other fiber optic sensor 5 with a different detection result is faulty. If the detections of the four fiber optic sensors 5 in the second detection unit J2 are all different, then the detection function of the second detection unit J2 fails, and all four fiber optic sensors 5 in the second detection unit J2 are faulty. If only the detection results of two fiber optic sensors 5 in the second detection unit J2 are the same, and these two fiber optic sensors 5 are located on different rails 8, then the detection function of the second detection unit J2 fails, and all four fiber optic sensors 5 in the second detection unit J2 are faulty. If only the detection results of two fiber optic sensors 5 in the second detection unit J2 are the same, and these two fiber optic sensors 5 are located on the same rail 8, then obtain the states of the first detection unit J1 and the third detection unit J3. If the first detection unit J1 is effective and there is no signal change in the third detection unit J3, then the detection function of the second detection unit J2 is incomplete but effective. At this time, the other two fiber optic sensors 5 in the second detection unit J2 are faulty.

[0086] Taking the example of a train leaving the first track section 1G via the second detection unit 2G, the method for determining the state of the first track section 1G is as follows: When the detection functions of the first detection unit J1, the second detection unit J2, and the third detection unit J3 are all effective, if the first detection unit J1 detects that the train enters the first track section 1G, then update the state of the first track section 1G to the occupied state; if the second detection unit J2 detects that the train completely leaves the first track section 1G, then update the state of the first track section 1G to the idle state.

[0087] When the detection function of at least one of the first detection unit J1, the second detection unit J2, and the third detection unit J3 fails, update the state of the first track section 1G to the occupied state.

[0088] When the detection function of at least one of the first detection unit J1, the second detection unit J2, and the third detection unit J3 fails, combine the first track section 1G, the third track section 3G, and the fourth track section 4G into a comprehensive track section. The detection unit at the entrance of the comprehensive track section is the fourth detection unit 1J4, and the detection unit at the exit of the comprehensive track section is the fifth detection unit 1J5. At this time, judge the state of the comprehensive track section according to the fourth detection unit 1J4 and the fifth detection unit 1J5, and the state of the first track section 1G is the same as the state of the comprehensive track section.

[0089] Such as Figure 5As shown in the figure, the second aspect of the present invention provides a track section status monitoring device based on an optical fiber sensor. The track section status monitoring device includes a data acquisition module, a first status determination module, and a second status determination module.

[0090] The data acquisition module is used to obtain the detection result of the optical fiber sensor 5 in the detection unit 1. The optical fiber sensor 5 is used to detect the axle number information of the train. In this embodiment, the data acquisition module can be used to execute Figure 1 the steps S100 shown in the figure. For the specific description of the data acquisition module, reference can be made to the description of the steps S100.

[0091] The first status determination module is used to determine the status of the detection unit 1 according to the detection result of the optical fiber sensor 5. In this embodiment, the first status determination module can be used to execute Figure 1 the steps S200 shown in the figure. For the specific description of the first status determination module, reference can be made to the description of the steps S200.

[0092] The second status determination module is used to determine the status of the track section according to the status of the detection units 1 at the entrance and exit of the track section; wherein, detection units 1 are provided at the demarcation points between adjacent track sections, the entrance of the first track section, and the exit of the last track section. In this embodiment, the second status determination module can be used to execute Figure 1 the steps S300 shown in the figure. For the specific description of the second status determination module, reference can be made to the description of the steps S300.

[0093] The third aspect of the present invention provides a track section status monitoring system based on an optical fiber sensor. The track section status monitoring system includes a detection unit 1 and a monitoring module 2.

[0094] The detection unit 1 is provided at the demarcation points between adjacent track sections, the entrance of the first track section, and the exit of the last track section. Each detection unit 1 includes two groups of optical fiber sensors 5 respectively arranged on two steel rails 8. Each group of optical fiber sensors 5 includes two optical fiber sensors 5. The optical fiber sensors are used to detect the axle number information of the train. In this embodiment, the optical fiber sensor 5 is used to detect the axle number information of the train, which can reduce the laying of cables and lower the cost; at the same time, the installation and maintenance of the optical fiber sensor 5 are extremely simple and fast, greatly reducing the maintenance cost, and can also avoid the problem of information errors caused by electromagnetic interference around the track. In this embodiment, each detection unit 1 is configured with four independent optical fiber sensors 5. The information of these four optical fiber sensors 5 is redundant with each other, and the correctness of the information can be ensured even in the case of partial failure of the optical fiber sensors 5, thereby ensuring the reliability of the system.

[0095] The monitoring module 2 is used to obtain the detection results of the optical fiber sensors 5 in the detection unit 1, determine the state of the detection unit 1 according to the detection results of the optical fiber sensors 5, and determine the state of the track section according to the states of the detection units 1 at the entrance and exit of the track section. In this embodiment, the monitoring module 2 can be used to execute Figure 1 the steps S100 to S300 shown. For the specific description of the monitoring module 2, reference can be made to the description of the steps S100 to S300.

[0096] In one embodiment, as Figure 3 shown, the track section status monitoring system includes a monitoring module 2, a plurality of detection units 1 (the first detection unit J1, the second detection unit J2, the third detection unit J3), a plurality of optical fiber splicing boxes, a plurality of optical transceiver units (the first optical transceiver unit, the second optical transceiver unit, and the third optical transceiver unit), a display unit, a power supply board, a section track relay 3, and a reset relay 4. The monitoring module 2 includes two data processing units (the first data processing unit and the second data processing unit) and an intelligent control unit. Among them, the detection unit 1 and the optical fiber splicing box belong to outdoor equipment, and the rest of the equipment belongs to indoor equipment.

[0097] The first detection unit J1 is connected to the first optical transceiver unit through an optical fiber splicing box. The second detection unit J2 is connected to the second optical transceiver unit through an optical fiber splicing box. The third detection unit J3 is connected to the third optical transceiver unit through an optical fiber splicing box. The first optical transceiver unit is respectively connected to the first data processing unit and the second data processing unit. The second optical transceiver unit is respectively connected to the first data processing unit and the second data processing unit. The third optical transceiver unit is respectively connected to the first data processing unit and the second data processing unit. The first data processing unit and the second data processing unit are connected to the intelligent control unit, and the intelligent control unit is connected to the display unit.

[0098] As Figure 6As shown in the figure, the first detection unit J1 includes four fiber optic sensors 5 (the first fiber optic sensor 5S1, the second fiber optic sensor 5S2, the third fiber optic sensor 5S3, and the fourth fiber optic sensor 5S4). The first fiber optic sensor 5S1 and the second fiber optic sensor 5S2 are arranged on the outer rail 8, and the third fiber optic sensor 5S3 and the fourth fiber optic sensor 5S4 are arranged on the inner rail 8; each fiber optic sensor 5 is installed at the central position between two sleepers 7, and the distance between the two fiber optic sensors 5 installed on the same rail 8 is the distance of one sleeper spacing. For example, the distance between the first fiber optic sensor 5S1 and the second fiber optic sensor 5S2 is the distance of one sleeper spacing, and the distance between the third fiber optic sensor 5S3 and the fourth fiber optic sensor 5S4 is the distance of one sleeper spacing. In this embodiment, the detection information of the fiber optic sensors 5 on the two rails 8 is mutually redundant, which can effectively avoid missed detection and misdetection of train wheels, and has a very high safety performance; the fiber optic sensors 5 are not affected by electromagnetic interference around the track, have high sampling accuracy, a wide range of requirements for train speed, and high safety and reliability.

[0099] Generally, as Figure 7 shown in the figure, each fiber optic sensor 5 is installed on the outside of the rail 8, and each fiber optic sensor 5 is installed and fixed by a fixture 6, and the installation and maintenance are simple and fast, and the maintainability is high.

[0100] The optical fiber splicing box is installed outside the track. The four fiber optic sensors 5 in the detection unit 1 are connected to the corresponding optical fiber splicing box through optical fiber pigtails, and the optical fiber pigtails are connected using FC interfaces. The optical fiber splicing box is connected to the main trunk optical cable through an FC flange interface to transmit the signal of each sensor in the detection unit 1 to the first optical transceiver unit for processing.

[0101] The optical transceiver unit is connected to the main trunk optical cable through an optical fiber interface FC, and is used to receive the optical signal detected by the fiber optic sensor 5, convert the received optical signal into an electrical signal, and after corresponding filtering and evaluation processing, send the information of the detection point to the data processing unit for processing through the DP bus.

[0102] The data processing unit receives the detection results of the detection unit 1 transmitted by the first optical transceiver unit, the second optical transceiver unit, and the third optical transceiver unit through the bus, and determines the state of the detection unit 1 and the state of the track section, as well as information such as the train running direction and the number of train axles.

[0103] The intelligent control unit receives the information transmitted by the data processing unit through the bus, sends the status of the detection unit 1, the status of the track section, and various warning messages, etc. to the display unit for display, and communicates with the signal control system through the section track relay 3 and the reset relay 4. Among them, the section track relay 3 is used for the track section status monitoring system to output the status signal of the track section to the signal control system, and the reset relay 4 is used to receive the reset signal sent by the signal control system to the track section status monitoring system.

[0104] The power supply board provides working power for the optical transceiver unit, the data processing unit, the intelligent control unit, etc.

[0105] The above are only the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in the relevant field. And the changes and modifications made by those skilled in the art that do not depart from the spirit and scope of the present invention should all be within the protection scope of the appended claims of the present invention.

Claims

1. A method for monitoring the state of an orbital section based on an optical fiber sensor, characterized in that Including: Obtaining the detection result of the fiber optic sensor in the detection unit, where the fiber optic sensor is used to detect the axle number information of the train; Determining the state of the detection unit according to the detection result of the fiber optic sensor; Determining the state of the track section according to the states of the detection units at the entrance and exit of the track section; Wherein, detection units are provided at the demarcation points between adjacent track sections, the entrance of the first track section, and the exit of the last track section; The detection unit includes two groups of fiber optic sensors respectively arranged on two steel rails, and each group of fiber optic sensors includes two fiber optic sensors; Determining the state of the detection unit according to the train axle number information includes: For each detection unit to be judged, judging whether the detection results of the fiber optic sensors in the detection unit to be judged are the same; If the detection results of all four fiber optic sensors in the detection unit to be judged are the same, the detection function of the detection unit to be judged is complete and effective; If the detection results of three fiber optic sensors in the detection unit to be judged are the same, the detection function of the detection unit to be judged is complete and effective; If the detection results of the four fiber optic sensors in the detection unit to be judged are all different, the detection function of the detection unit to be judged fails; Determining the state of the detection unit according to the train axle number information further includes: If only the detection results of two fiber optic sensors in the detection unit to be judged are the same, judging whether the two fiber optic sensors with the same detection results in the detection unit to be judged are on the same steel rail; If the two fiber optic sensors with the same detection results in the detection unit to be judged are not on the same steel rail, the detection function of the detection unit to be judged fails; If the two fiber optic sensors with the same detection results in the detection unit to be judged are on the same steel rail, obtaining the state of the corresponding entrance detection unit when the detection unit to be judged is used as an exit detection unit; the exit detection unit is the detection unit located at the exit of the track section, and the entrance detection unit is the detection unit located at the entrance of the track section; If the two fiber optic sensors with the same detection results in the detection unit to be judged are on the same steel rail, judging whether there are other exit detection units in the track section corresponding to the detection unit to be judged when it is used as an exit detection unit; If it is judged that there are other exit detection units in the track section corresponding to the detection unit to be judged when it is used as an exit detection unit, obtaining the states of the other exit detection units; If the detection function of the entrance detection unit is effective and there is no signal change in the other exit detection units, the detection function of the detection unit to be judged is incomplete but effective; If there are no other exit detection units in the track section and the detection function of the entrance detection unit is effective, the detection function of the detection unit to be judged is incomplete but effective.

2. The method for monitoring the state of a track section according to claim 1, wherein Determining the state of the track section according to the states of the detection units at the entrance and exit of the track section includes: If the detection functions of all the detection units at the entrance and exit of the track section are effective, when a detection unit at the entrance of the track section detects a train, the state of the track section is updated to the occupied state, and when a detection unit at the exit of the track section detects that the train has completely left, the state of the track section is updated to the idle state.

3. The method for monitoring the state of a track section according to claim 2, wherein If there is a detection unit with a failed fiber optic sensor among all the detection units at the entrance and exit of the track section, a first warning message is output; If there are two detection units with failed fiber optic sensors among all the detection units at the entrance and exit of the track section, a second warning message is output.

4. The method for monitoring the state of a track section according to claim 1, characterized in that, Determining the state of the track section according to the states of the detection units at the entrance and exit of the track section includes: When there is a detection unit with a failed detection function among all the detection units at the entrance and exit of the track section, the state of the track section is updated to the occupied state.

5. The method for monitoring the state of a track section according to claim 4, characterized in that, Determining the state of the track section according to the states of the detection units at the entrance and exit of the track section further includes: When there is a detection unit with a failed detection function among all the detection units at the entrance and exit of the track section, it is judged whether there are track sections before and after the track section; If there are track sections before and after the track section, the track section and the track sections before and after it are merged into a comprehensive track section; Judge the state of the comprehensive track section; Update the state of the track section according to the state of the comprehensive track section.

6. An on - track section status monitoring device based on an optical fiber sensor, characterized in that, Including: A data acquisition module for acquiring the detection results of the fiber optic sensors in the detection unit, and the fiber optic sensors are used to detect the axle number information of the train; A first state determination module for determining the state of the detection unit according to the detection results of the fiber optic sensors; A second state determination module for determining the state of the track section according to the states of the detection units at the entrance and exit of the track section; Among them, detection units are provided at the demarcation points between adjacent track sections, the entrance of the first track section, and the exit of the last track section; The detection unit includes two groups of fiber optic sensors respectively arranged on two steel rails, and each group of fiber optic sensors includes two fiber optic sensors; Determining the state of the detection unit according to the train axle number information includes: For each detection unit to be judged, it is judged whether the detection results of the fiber optic sensors in the detection unit to be judged are the same; If the detection results of all four fiber optic sensors in the detection unit to be judged are the same, the detection function of the detection unit to be judged is complete and effective; If the detection results of three fiber optic sensors in the detection unit to be judged are the same, the detection function of the detection unit to be judged is complete and effective; If the detection results of the four fiber optic sensors in the detection unit to be judged are all different, the detection function of the detection unit to be judged fails; Determining the state of the detection unit according to the train axle number information further includes: If only the detection results of two fiber optic sensors in the detection unit to be judged are the same, it is judged whether the two fiber optic sensors with the same detection results in the detection unit to be judged are on the same steel rail; If two fiber optic sensors with the same detection result in the detection unit to be judged are not on the same rail, the detection function of the detection unit to be judged fails; If two fiber optic sensors with the same detection result in the detection unit to be judged are on the same rail, obtain the status of the corresponding entrance detection unit when the detection unit to be judged is used as an exit detection unit; the exit detection unit is a detection unit located at the exit of the track section, and the entrance detection unit is a detection unit located at the entrance of the track section; If two fiber optic sensors with the same detection result in the detection unit to be judged are on the same rail, judge whether there are other exit detection units in the track section corresponding to the detection unit to be judged when it is used as an exit detection unit; If it is judged that there are other exit detection units in the track section corresponding to the detection unit to be judged when it is used as an exit detection unit, obtain the status of the other exit detection units; If the detection function of the entrance detection unit is effective and there is no signal change in the other exit detection units, the detection function of the detection unit to be judged is incomplete but effective; If there are no other exit detection units in the track section and the detection function of the entrance detection unit is effective, the detection function of the detection unit to be judged is incomplete but effective.

7. An orbit section state monitoring system based on an optical fiber sensor, characterized in that, Including: Detection units are arranged at the demarcation points between adjacent track sections, the entrances of the first track section, and the exits of the last track section. Each detection unit includes two groups of fiber optic sensors respectively arranged on two rails. Each group of fiber optic sensors includes two fiber optic sensors, and the fiber optic sensors are used to detect the axle number information of the train; The monitoring module is used to obtain the detection results of the fiber optic sensors in the detection unit, determine the status of the detection unit according to the detection results of the fiber optic sensors, and determine the status of the track section according to the status of the detection units at the entrance and exit of the track section; Determining the status of the detection unit according to the train axle number information includes: For each detection unit to be judged, judge whether the detection results of the fiber optic sensors in the detection unit to be judged are the same; If the detection results of all four fiber optic sensors in the detection unit to be judged are the same, the detection function of the detection unit to be judged is complete and effective; If the detection results of three fiber optic sensors in the detection unit to be judged are the same, the detection function of the detection unit to be judged is complete and effective; If the detection results of the four fiber optic sensors in the detection unit to be judged are all different, the detection function of the detection unit to be judged fails; Determining the status of the detection unit according to the train axle number information further includes: If only two fiber optic sensors in the detection unit to be judged have the same detection result, judge whether the two fiber optic sensors with the same detection result in the detection unit to be judged are on the same rail; If two fiber optic sensors with the same detection result in the detection unit to be judged are not on the same rail, the detection function of the detection unit to be judged fails; If two fiber optic sensors with the same detection result in the detection unit to be judged are located on the same rail, obtain the status of the corresponding inlet detection unit when the detection unit to be judged is used as the outlet detection unit; the outlet detection unit is the detection unit located at the outlet of the track section, and the inlet detection unit is the detection unit located at the inlet of the track section; If two fiber optic sensors with the same detection result in the detection unit to be judged are located on the same rail, judge whether there are other outlet detection units in the corresponding track section when the detection unit to be judged is used as the outlet detection unit; If it is judged that there are other outlet detection units in the corresponding track section when the detection unit to be judged is used as the outlet detection unit, obtain the status of the other outlet detection units; If the detection function of the inlet detection unit is effective and there is no signal change in the other outlet detection units, the detection function of the detection unit to be judged is incomplete but effective; If there are no other outlet detection units in the track section and the detection function of the inlet detection unit is effective, the detection function of the detection unit to be judged is incomplete but effective.

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