CN117622260A - Train approach detection method and system - Google Patents

Abstract

The invention discloses a train approaching detection method and a train approaching detection system, which are used for detecting a preset detection point based on at least two distance meters; acquiring a ranging value D1 monitored by a first range finder, and judging whether D1 is smaller than G; if the distance measurement value D1 is smaller than the preset threshold value, recording duration time T1 of the distance measurement value D1, and judging whether T1 is larger than the preset threshold value; if the distance measurement value is larger than the G, acquiring a distance measurement value D2 monitored by a second distance meter, and judging whether D2 is smaller than G; if the error is smaller than the preset threshold, and the error between D2 and D1 is within the preset range, recording the duration time T2 of D2, and judging whether T2 is larger than the preset threshold; and if the train proximity alarm information is larger than the train proximity alarm information, generating train proximity alarm information. The invention utilizes the technical characteristics of length and width in the railway rolling stock limit and the characteristic of gaps at the joints of the rolling stock, and cooperatively judges whether the passing detection point is a train or not through at least two laser range finders; the invention is simple and easy to operate, and realizes higher reliability with lower cost.

Description

Train approach detection method and system

Technical Field

The invention relates to the technical field of intelligent operation and maintenance of railways, in particular to a train proximity detection method and system.

Background

The railway construction maintenance operation must put the safety protection in the first place, must ensure the personal safety of outdoor operation personnel. Because the railway signal system is an important system for ensuring driving safety, a large number of detection equipment is not allowed to be distributed beside a track in order to ensure driving safety, and meanwhile, all non-railway equipment except for the system which is approved by a railway head office at present cannot be networked with the signal system to acquire train position information.

The construction site environment is complex, various operation vehicles and personnel travel on the operation site, a single detection means has no false alarm prevention characteristic, false alarms can be continuously generated, and the personnel safety cannot be protected. Therefore, a method with simple structure and easy implementation is needed, most false alarms can be filtered, and accurate detection of train approach is realized.

Disclosure of Invention

The application provides a train proximity detection method and system, which are used for solving the problems that the existing train proximity detection means is inaccurate, error alarm is easy to generate and personnel safety cannot be protected.

According to a first aspect, in one embodiment there is provided a train proximity detection method, the method comprising:

detecting preset detection points based on at least two distance meters, wherein the adjacent distance meters are arranged according to preset intervals i, the distance measuring direction of each distance meter is perpendicular to the extending direction of a railway steel rail, the preset distance between each distance meter and the steel rail is G, and the preset distance between each distance meter and the ground is H;

acquiring a ranging value D1 monitored by a first range finder, and judging whether the ranging value D1 is smaller than a distance G or not;

if the distance measurement value D1 is smaller than the distance G, recording the duration time T1 of the distance measurement value D1, and judging whether the duration time T1 is larger than a preset threshold value or not;

if the duration time T1 is greater than a preset threshold value, acquiring a ranging value D2 monitored by a second range finder, and judging whether the ranging value D2 is smaller than a distance G or not;

if the ranging value D2 is smaller than the distance G and the error between the ranging value D2 and the ranging value D1 is within a preset range, recording the duration time T2 of the ranging value D2, and judging whether the duration time T2 is larger than a preset threshold value;

and if the duration time T2 is greater than a preset threshold value, generating train approaching warning information.

Further, generating train approach warning information, specifically further includes:

continuously monitoring the distance;

acquiring a first pulse signal monitored by a first range finder, wherein the first pulse signal is generated by the abrupt change of a ranging value when the first range finder detects a gap between train carriages;

acquiring a second pulse signal monitored by a second range finder, wherein the second pulse signal is generated by abrupt change of a ranging value when the second range finder detects a gap between train carriages;

and acquiring the time difference T of the first pulse signal and the second pulse signal, and calculating the train speed by combining the length L of a single train, wherein the train speed S=L/T.

Further, determining whether the ranging value D1 is smaller than the distance G, specifically further includes:

and if the distance measurement value D1 is larger than the distance G, performing alarm-free processing.

Further, determining whether the duration T1 is greater than a preset threshold value, specifically further includes:

and if the duration T1 is smaller than a preset threshold value, performing non-alarm processing.

Further, determining whether the ranging value D2 is smaller than the distance G, specifically further includes:

and if the distance measurement value D2 is larger than the distance G, performing alarm-free processing.

Further, determining whether the duration T2 is greater than a preset threshold value, specifically further includes:

and if the duration T2 is smaller than a preset threshold value, performing non-alarm processing.

Further, the method further comprises:

and determining a detection point and an instrument installation position based on the railway construction maintenance operation range and the alarm requirement.

Further, the installation requirement of the range finder is as follows: 1250mm < H <3000mm,2440mm < G <4000mm,20000mm < i <25000mm.

According to a first aspect, there is provided in one embodiment a train proximity detection system, the system comprising:

the distance measuring module is used for detecting a preset detection point based on at least two distance measuring instruments, the adjacent distance measuring instruments are arranged according to a preset interval i, the distance measuring direction of each distance measuring instrument is perpendicular to the extending direction of the railway steel rail, the preset distance between the distance measuring instrument and the steel rail is G, and the preset distance between the distance measuring instrument and the ground is H;

the train approach detection module is used for acquiring a ranging value D1 monitored by the first range finder and judging whether the ranging value D1 is smaller than a distance G or not;

if the distance measurement value D1 is smaller than the distance G, recording the duration time T1 of the distance measurement value D1, and judging whether the duration time T1 is larger than a preset threshold value or not;

if the duration time T1 is greater than a preset threshold value, acquiring a ranging value D2 monitored by a second range finder, and judging whether the ranging value D2 is smaller than a distance G or not;

if the ranging value D2 is smaller than the distance G and the error between the ranging value D2 and the ranging value D1 is within a preset range, recording the duration time T2 of the ranging value D2, and judging whether the duration time T2 is larger than a preset threshold value;

and if the duration time T2 is greater than a preset threshold value, generating train approaching warning information.

Further, the system also comprises a vehicle speed measuring and calculating module, which is specifically used for:

acquiring a first pulse signal monitored by a first range finder, wherein the first pulse signal is generated by the abrupt change of a ranging value when the first range finder detects a gap between train carriages;

acquiring a second pulse signal monitored by a second range finder, wherein the second pulse signal is generated by abrupt change of a ranging value when the second range finder detects a gap between train carriages;

and acquiring the time difference T of the first pulse signal and the second pulse signal, and calculating the train speed by combining the length L of a single train, wherein the train speed S=L/T.

The application provides a train approaching detection method and a train approaching detection system, which are used for detecting a preset detection point based on at least two distance meters; acquiring a ranging value D1 monitored by a first range finder, and judging whether the ranging value D1 is smaller than a distance G or not; if the distance measurement value D1 is smaller than the distance G, recording the duration time T1 of the distance measurement value D1, and judging whether the duration time T1 is larger than a preset threshold value or not; if the duration time T1 is greater than a preset threshold value, acquiring a ranging value D2 monitored by a second range finder, and judging whether the ranging value D2 is smaller than a distance G or not; if the ranging value D2 is smaller than the distance G and the error between the ranging value D2 and the ranging value D1 is within a preset range, recording the duration time T2 of the ranging value D2, and judging whether the duration time T2 is larger than a preset threshold value; and if the duration time T2 is greater than a preset threshold value, generating train approaching warning information. The invention utilizes the technical characteristics of length and width in the railway rolling stock limit and the characteristic of gaps at the joints of the rolling stock, and cooperatively judges whether the passing detection point is a train or not through at least two laser range finders; the invention is simple and easy to operate, and realizes higher reliability with lower cost.

Drawings

Fig. 1 is a top view of a distance meter installed in a train proximity detection method according to an embodiment of the present invention;

FIG. 2 is a side view of a rangefinder installed in a train proximity detection method according to one embodiment of the present invention;

FIG. 3 is a diagram of the spatial relationship between a train vehicle and a rangefinder in a train proximity detection method according to an embodiment of the present invention;

fig. 4 is a flowchart of a train proximity detection algorithm in a train proximity detection method according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a speed measurement principle in a train proximity detection method according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a train proximity detection system according to an embodiment of the present invention.

Detailed Description

The invention will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations based on the description herein and the general knowledge of one skilled in the art.

Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.

The first embodiment of the invention provides a train approach detection method, and the method is described in detail below.

In step S101, a detection point and an instrument installation position are determined based on the railway construction maintenance operation range and the alarm requirement.

The installation position of the instrument needs to be calculated according to the early warning time requirement. For example, when the vehicle speed is 60km/h, the installation position is required to be 500m away from the working area when an alarm is required to be given in advance by 30S.

In step S102, a preset detection point is detected based on at least two rangefinders.

In this embodiment, as shown in fig. 1 and 2, the detectors a and B are set to the same range finder group, and the group number is 1. The adjacent distance meters are arranged according to a preset interval i, and the distance measuring direction of each distance meter is perpendicular to the extending direction of the railway steel rail and is installed at a certain height H from the ground.

The distancer installation demand is: the range finder mounting height H ranges from 1250mm < H <3000mm; the range of the outermost steel rail G of the range finder is 2440mm < G <4000mm, and the G values of the two range finders are consistent. The distance i between two distance measuring devices ranges from 20000mm < i <25000mm.

In this embodiment, the mounting height h=1500 mm of the rangefinder, the outer-most rail g=3000 mm of the range finder, and the distance i=22000 mm between two rangefinders.

After the train runs to the detection point, the spatial relationship between the train vehicle and the distance meter is shown in fig. 3, and the distance value detected by the distance meter is smaller than the G value because the vehicle body is wider than the distance between the two rails.

In step S103, after detecting the distance change, the distance meter judges whether the train passes according to the train approach detection algorithm, if so, alarms are given and the speed of the train passing the monitoring point is automatically calculated.

The train approach detection algorithm is shown in fig. 4, and specifically comprises the following steps:

1) Setting initial parameters, wherein the parameters comprise a G value of a rail at the outermost side of the epitaxial distance of the distance measuring instrument, a distance i value of two distance measuring instruments, a length L value of a single train and a grouping number of the measuring instrument;

2) When any distance meter detects the distance change, detecting that the first distance meter outputs distance data D1, and when the distance meter detects the distance D1< G, judging the time;

3) Detecting the duration time T1 of the distance change, and if the duration time T1 is more than 1S, reading the data D2 of the second range finder in the group;

4) If the second range finder data D2 in the group is smaller than G and is consistent with the first range finder distance D1 in the group (including a range error of 5 cm), the second range finder distance change duration T2 in the group is judged.

5) And outputting a train approaching alarm by the second range finder with the distance change duration time T2 being more than 1S, and starting train speed measurement.

6) When the distance meter detects the gap between the train carriages, the distance can be suddenly increased, the transmitted distance data can form a pulse signal, as shown in fig. 5, the speed s=l/T is calculated by calculating the time difference T of the pulse signals generated by the two distance meters and combining with the preset vehicle length.

The following test scenarios are illustrated:

scene one: and a single operator walks in the center of the line and passes through the monitoring point. The distance meter a detects a distance change d=3715mm, D > g, and the system does not alarm.

Scene II: and a single operator walks beside the track and passes through the monitoring points. The distance meter a detects the distance change d=2500 mm, D < g, the system makes a time decision T <1S, and no alarm is given.

Scene III: one operator stands beside the track of the distance meter A, the distance meter A detects the distance change D=2500 mm, D < G, the system carries out time judgment T >1S, the data of the distance meter B is judged, the other operator passes through the distance meter B, D=2510 mm, D < G, the system carries out time judgment T <1S, and the system does not carry out alarm.

Scene four: one operator stands beside the track of the distance meter A, the distance meter A detects the distance change D=2500 mm, D < G, the system carries out time judgment T >1S, the data of the distance meter B starts to be judged, the other operator stands beside the track of the distance meter B, D=2510 mm, D < G, the system carries out time judgment T >1S, the system alarms and measures and calculates the vehicle speed, and the vehicle speed is 0 as no pulse exists.

Scene five: the train approaches, the distance meter A detects the distance change D=1125 mm, D < G, the system judges the time T >1S, the data of the distance meter B starts to be judged, D=1135 mm, D < G, the system judges the time T >1S, the system alarms and measures the speed of the vehicle, the pulse interval 3S of the distance meter A, B, and the speed of the vehicle is measured as S=25/3S=8.3 m/s=30 km/h.

According to the train proximity detection method provided by the embodiment of the invention, the preset detection points are detected based on at least two range finders; acquiring a ranging value D1 monitored by a first range finder, and judging whether D1 is smaller than G; if the distance measurement value D1 is smaller than the preset threshold value, recording duration time T1 of the distance measurement value D1, and judging whether T1 is larger than the preset threshold value; if the distance measurement value is larger than the G, acquiring a distance measurement value D2 monitored by a second distance meter, and judging whether D2 is smaller than G; if the error is smaller than the preset threshold, and the error between D2 and D1 is within the preset range, recording the duration time T2 of D2, and judging whether T2 is larger than the preset threshold; and if the train proximity alarm information is larger than the train proximity alarm information, generating train proximity alarm information. The invention utilizes the technical characteristics of length and width in the railway rolling stock limit and the characteristic of gaps at the joints of the rolling stock, and cooperatively judges whether the passing detection point is a train or not through at least two laser range finders; the invention is simple and easy to operate, and realizes higher reliability with lower cost.

Corresponding to the above disclosed train approach detection method, the embodiment of the invention also discloses a train approach detection system, as shown in fig. 6, which specifically comprises:

the distance measuring module is used for detecting a preset detection point based on at least two distance measuring instruments, the adjacent distance measuring instruments are arranged according to a preset interval i, the distance measuring direction of each distance measuring instrument is perpendicular to the extending direction of the railway steel rail, the preset distance between the distance measuring instrument and the steel rail is G, and the preset distance between the distance measuring instrument and the ground is H;

the train approach detection module is used for acquiring a ranging value D1 monitored by the first range finder and judging whether the ranging value D1 is smaller than a distance G or not;

if the distance measurement value D1 is smaller than the distance G, recording the duration time T1 of the distance measurement value D1, and judging whether the duration time T1 is larger than a preset threshold value or not;

if the duration time T1 is greater than a preset threshold value, acquiring a ranging value D2 monitored by a second range finder, and judging whether the ranging value D2 is smaller than a distance G or not;

if the ranging value D2 is smaller than the distance G and the error between the ranging value D2 and the ranging value D1 is within a preset range, recording the duration time T2 of the ranging value D2, and judging whether the duration time T2 is larger than a preset threshold value;

and if the duration time T2 is greater than a preset threshold value, generating train approaching warning information.

Further, the system also comprises a vehicle speed measuring and calculating module, which is specifically used for:

acquiring a first pulse signal monitored by a first range finder, wherein the first pulse signal is generated by the abrupt change of a ranging value when the first range finder detects a gap between train carriages;

acquiring a second pulse signal monitored by a second range finder, wherein the second pulse signal is generated by abrupt change of a ranging value when the second range finder detects a gap between train carriages;

and acquiring the time difference T of the first pulse signal and the second pulse signal, and calculating the train speed by combining the length L of a single train, wherein the train speed S=L/T.

It should be noted that, for the detailed description of the train proximity detection system provided by the embodiment of the present invention, reference may be made to the related description of the train proximity detection method provided by the embodiment of the present application, which is not repeated here.

Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by a computer program. When all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a computer readable storage medium, and the storage medium may include: read-only memory, random access memory, magnetic disk, optical disk, hard disk, etc., and the program is executed by a computer to realize the above-mentioned functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above can be realized. In addition, when all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a removable hard disk, and the program in the above embodiments may be implemented by downloading or copying the program into a memory of a local device or updating a version of a system of the local device, and when the program in the memory is executed by a processor.

The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.

Claims (10)

1. A method for detecting proximity of a train, the method comprising:

detecting preset detection points based on at least two distance meters, wherein the adjacent distance meters are arranged according to preset intervals i, the distance measuring direction of each distance meter is perpendicular to the extending direction of a railway steel rail, the preset distance between each distance meter and the steel rail is G, and the preset distance between each distance meter and the ground is H;

acquiring a ranging value D1 monitored by a first range finder, and judging whether the ranging value D1 is smaller than a distance G or not;

if the distance measurement value D1 is smaller than the distance G, recording the duration time T1 of the distance measurement value D1, and judging whether the duration time T1 is larger than a preset threshold value or not;

if the duration time T1 is greater than a preset threshold value, acquiring a ranging value D2 monitored by a second range finder, and judging whether the ranging value D2 is smaller than a distance G or not;

if the ranging value D2 is smaller than the distance G and the error between the ranging value D2 and the ranging value D1 is within a preset range, recording the duration time T2 of the ranging value D2, and judging whether the duration time T2 is larger than a preset threshold value;

and if the duration time T2 is greater than a preset threshold value, generating train approaching warning information.

2. The method for detecting the proximity of a train according to claim 1, wherein generating the proximity warning information of the train, specifically further comprises:

continuously monitoring the distance;

acquiring a first pulse signal monitored by a first range finder, wherein the first pulse signal is generated by the abrupt change of a ranging value when the first range finder detects a gap between train carriages;

acquiring a second pulse signal monitored by a second range finder, wherein the second pulse signal is generated by abrupt change of a ranging value when the second range finder detects a gap between train carriages;

and acquiring the time difference T of the first pulse signal and the second pulse signal, and calculating the train speed by combining the length L of a single train, wherein the train speed S=L/T.

3. The train proximity detection method according to claim 1, wherein determining whether the distance measurement value D1 is smaller than a distance G, specifically further comprises:

and if the distance measurement value D1 is larger than the distance G, performing alarm-free processing.

4. The train proximity detection method according to claim 1, wherein determining whether the duration T1 is greater than a preset threshold value, specifically further comprises:

and if the duration T1 is smaller than a preset threshold value, performing non-alarm processing.

5. The train proximity detection method according to claim 1, wherein determining whether the distance measurement value D2 is smaller than a distance G, specifically further comprises:

and if the distance measurement value D2 is larger than the distance G, performing alarm-free processing.

6. The train proximity detection method according to claim 1, wherein determining whether the duration T2 is greater than a preset threshold value, further comprises:

and if the duration T2 is smaller than a preset threshold value, performing non-alarm processing.

7. The train proximity detection method of claim 1, wherein the method further comprises:

and determining a detection point and an instrument installation position based on the railway construction maintenance operation range and the alarm requirement.

8. The train proximity detection method according to claim 1, wherein the installation requirements of the distance meter are: 1250mm < H <3000mm,2440mm < G <4000mm,20000mm < i <25000mm.

9. A train proximity detection system, the system comprising:

the distance measuring module is used for detecting a preset detection point based on at least two distance measuring instruments, the adjacent distance measuring instruments are arranged according to a preset interval i, the distance measuring direction of each distance measuring instrument is perpendicular to the extending direction of the railway steel rail, the preset distance between the distance measuring instrument and the steel rail is G, and the preset distance between the distance measuring instrument and the ground is H;

the train approach detection module is used for acquiring a ranging value D1 monitored by the first range finder and judging whether the ranging value D1 is smaller than a distance G or not;

if the distance measurement value D1 is smaller than the distance G, recording the duration time T1 of the distance measurement value D1, and judging whether the duration time T1 is larger than a preset threshold value or not;

if the duration time T1 is greater than a preset threshold value, acquiring a ranging value D2 monitored by a second range finder, and judging whether the ranging value D2 is smaller than a distance G or not;

if the ranging value D2 is smaller than the distance G and the error between the ranging value D2 and the ranging value D1 is within a preset range, recording the duration time T2 of the ranging value D2, and judging whether the duration time T2 is larger than a preset threshold value;

and if the duration time T2 is greater than a preset threshold value, generating train approaching warning information.

10. The train proximity detection system of claim 9, further comprising a vehicle speed measurement module, specifically configured to:

acquiring a first pulse signal monitored by a first range finder, wherein the first pulse signal is generated by the abrupt change of a ranging value when the first range finder detects a gap between train carriages;

acquiring a second pulse signal monitored by a second range finder, wherein the second pulse signal is generated by abrupt change of a ranging value when the second range finder detects a gap between train carriages;

and acquiring the time difference T of the first pulse signal and the second pulse signal, and calculating the train speed by combining the length L of a single train, wherein the train speed S=L/T.