JP2020132064A - Detection method, alarm control method, detection device, and alarm control device - Google Patents

Abstract

To propose a new technique for detecting the position and speed of a train on the ground side.SOLUTION: An alarm control device 30 of a railroad crossing 10 includes: a detection device 40 for detecting a position and speed of a train with respect to the railroad crossing 10; and a timing determination unit 32 for determining the start timing and/or the end timing of the alarm control of the railroad crossing 10 based on the position and speed of the train detected by the detection device 40. The detection device 40 includes: a transmission unit 42 for periodically transmitting a pulse wave having a prescribed pulse frequency from a prescribed position Pof a rail R defined within the railroad crossing 10 or within a prescribed distance from the railroad crossing 10; a detection unit 44 for detecting a reflected wave against a pulse wave that occurs when the train is on the rail R at the prescribed position P; a calculation unit 46 for calculating the position and speed of the train based on the transmission and reception interval between the transmission of the pulse wave by the transmission unit 42 and the detection of the reflected wave by the detection unit 44, and the change in the transmission and reception interval.SELECTED DRAWING: Figure 1

Description

The present invention relates to a detection method for detecting the position and speed of a train.

Detection of train position and speed is used in various situations. A railroad crossing will be described as an example. Railroad crossings are provided with railroad crossing security devices including railroad crossing alarms, railroad crossing breakers, and railroad crossing control devices that control their operations. The railroad crossing security device controls to start an alarm such as a sound of a railroad crossing alarm or a descent of a railroad crossing breaker when a train approaches, and to end the alarm when the train passes. As a method for detecting the approach or passage of a train to a railroad crossing, a point control method that detects by a railroad crossing controller installed at an alarm start point or an alarm end point (see, for example, Patent Document 1), or an alarm end point from an alarm start point. There is a continuous closed circuit system that continuously detects trains in the section by installing a track circuit in the entire railroad crossing warning section.

Japanese Unexamined Patent Publication No. 2012-96705

In recent years, there has been a problem of so-called "railroad crossings that do not open", in which the railroad crossing cut-off time becomes long, especially in line sections with a large number of trains such as in the suburbs of cities. The warning start point of a railroad crossing is set at a position where a predetermined standard warning time can be secured from the start of the warning until the train reaches the railroad crossing when the train runs at the maximum speed. .. In a section where the number of trains is large, a plurality of trains in the same direction or in the opposite direction frequently pass through the railroad crossing, and the warnings of each train are continuous without interruption, so that the cutoff time tends to be long. In addition, when the train interval is short, the train speed decreases, so that the time to reach the railroad crossing becomes longer, and the cutoff time becomes longer accordingly.

Therefore, various methods have been developed for shortening the railroad crossing cutoff time. For example, there is a method of switching the alarm start point according to the position and speed of the train approaching the railroad crossing. In either method, it is necessary to acquire the position and speed of the train approaching the railroad crossing at any time.

The railroad crossing has been described as an example in which the detection of the position and speed of the train is used, but there are various situations in which the position and speed of the train can be used or can be used other than the railroad crossing. For example, there is a case of displaying a guide such as a train approaching or broadcasting, a case of detecting whether or not the train has stopped at a fixed position, and the like.

As for train detection, the track circuit for detecting the presence of the line in the above-mentioned block section is the mainstream, but since the track circuit is a device for detecting the presence of the line in each section, the detection accuracy of the position and speed of the train is high. Naturally there are limits.

An object to be solved by the present invention is to propose a new technique for detecting the position and speed of a train on the ground side.

The first invention for solving the above problems is
A detection method that detects the position and / or speed of a train traveling on a rail.
Periodically transmitting a pulse wave of a predetermined pulse frequency from a predetermined position on the rail,
To detect the reflected wave with respect to the pulse wave generated when the train is on the rail at the predetermined position, and
To calculate the position and / or speed of the train based on the transmission / reception interval between the pulse wave and the detected reflected wave.
It is a detection method including.

According to the first invention, the position and / or speed of a train traveling on a rail can be detected by a simple method such as transmitting a pulse wave from a predetermined position on the rail and detecting the reflected wave. That is, the rails are short-circuited by the wheel axis of the train on the rail, and the pulse wave is reflected at the short-circuited position, but the distance from the predetermined position, which is the transmission position of the pulse wave, to the short-circuited position (the length along the rail) , The transmission / reception interval from the transmission of the pulse wave to the detection of the reflected wave changes. Therefore, the position where the pulse wave is reflected, that is, the position of the train can be detected from the transmission / reception interval. In addition, since the short-circuit position between the rails changes as the train travels, the transmission / reception interval changes. Therefore, the pulse wave is transmitted a plurality of times, and the change in the position where the pulse wave is reflected, that is, the change in the position of the train, can be detected from the change in the transmission / reception interval of each. These make it possible to detect the position and / or speed of the train at a predetermined position on the ground side.

The second invention is the first invention.
Controlling the pulse frequency based on the presence / absence of the detection of the reflected wave and the calculated position of the train.
Is a detection method that further includes.

According to the second invention, by controlling the pulse frequency of the pulse wave based on the presence / absence of detection of the reflected wave and the calculated train position, the reflected wave can be easily detected, and the position of the train and / or It is possible to reliably detect the speed. That is, the pulse wave is attenuated as the propagation distance in the rail increases. For example, when the train does not exist, or when the train is on the line but far from the predetermined position, it becomes difficult to detect the reflected wave. Therefore, when the reflected wave is not detected or when the calculated train position is far, the pulse frequency of the pulse wave is lowered to increase the pulse width of the pulse wave and facilitate the detection of the reflected wave. ..

The third invention is the second invention.
Controlling the pulse frequency satisfies a predetermined short-distance condition indicating that the calculated position of the train is closer to the predetermined position than the frequency when the reflected wave is not detected. Including controlling the frequency to be higher,
It is a detection method.

Since the pulse wave is attenuated as the propagation distance in the rail increases, the pulse frequency should be lowered so that the pulse width becomes longer when the propagation distance is long, and the pulse width becomes shorter when the propagation distance is short. It is preferable to increase the pulse frequency. Therefore, as in the third invention, the reflected wave can be easily detected by controlling the frequency when the train position is close to the predetermined position to be higher than the frequency when the reflected wave is not detected. However, it becomes possible to detect the position and / or speed of the train more accurately.

The fourth invention is the first invention.
The transmission involves superimposing the first pulse wave having the first pulse frequency and the second pulse wave having the second pulse frequency higher than the first pulse frequency, or sequentially switching the transmission. Including doing
The detection includes detecting a first reflected wave with respect to the first pulse wave and a second reflected wave with respect to the second pulse wave.
The calculation is the first transmission / reception situation including the transmission / reception interval between the first pulse wave and the detected first reflected wave, and the second pulse wave and the detected second reflection. Including calculating the position and / or speed of the train based on a second transmission / reception situation including a transmission / reception interval with a wave.
It is a detection method.

Since the pulse wave is attenuated as the propagation distance in the rail increases, it becomes difficult to detect the reflected wave, for example, when there is no train or when the train is on the line but far from a predetermined position. Therefore, as in the fourth invention, two types of pulse waves having different pulse frequencies (first pulse wave and second pulse wave) are superposed or sequentially switched and transmitted, and transmission / reception for each is performed. Based on the situation, the position and / or speed of the train can be detected more accurately.

The fifth invention is the fourth invention.
The above calculation is
When a predetermined long distance condition indicating that the position of the train is far from the predetermined position is satisfied, the position and / or speed of the train is calculated based on the first transmission / reception situation.
When the predetermined short distance condition indicating that the position of the train is close to the predetermined position is satisfied, the position and / or speed of the train is calculated based on the second transmission / reception situation.
including,
It is a detection method.

The pulse wave is attenuated as the propagation distance in the rail increases. Therefore, as in the fifth invention, when the calculated train position is far from the predetermined position, the calculated train position is based on the first transmission / reception status of the first pulse wave having the lower pulse frequency. When the position is close to the predetermined position, it is possible to detect the position and / or speed of the train more accurately based on the second transmission / reception status of the second pulse wave having the higher pulse frequency. Become.

The sixth invention is the invention of any one of the first to fifth aspects.
Determining the presence or absence of a train in a predetermined section based on the presence or absence of the detection of the reflected wave.
Is a detection method that further includes.

Since the pulse wave is attenuated as the propagation distance in the rail becomes longer, the reflected wave is not detected, for example, when there is no train or when the train is on the line but far from the predetermined position. Therefore, as in the sixth invention, when the reflected wave is not detected, it can be determined that the train is not present in the predetermined section. The predetermined section can be defined as, for example, a section from the relationship between the propagation distance of the pulse wave in the rail and the degree of attenuation to the propagation distance at which the reflected wave can be regarded as almost undetectable.

The seventh invention is
This is a railroad crossing alarm control method.
The predetermined position is determined within the railroad crossing or within a predetermined distance from the railroad crossing, and 1) the position of the train or 2) the position and speed of the train with respect to the railroad crossing is detected by any one of the first to sixth inventions. Detecting by method and
Determining the start timing and / or end timing of the warning control of the railroad crossing based on the detection result.
It is an alarm control method including.

According to the seventh invention, the position and speed of the train with respect to the railroad crossing can be detected, and the start timing and / or end timing of the warning control of the railroad crossing is determined based on the detected position and speed of the train. Control that shortens the railroad crossing cutoff time becomes possible.

As the eighth invention
A detection device that detects the position and / or speed of a train running on a rail.
A transmitter that periodically transmits a pulse wave of a predetermined pulse frequency from a predetermined position on the rail,
A detection unit that detects a reflected wave with respect to the pulse wave generated when the train is on the rail at the predetermined position, and a detection unit.
A calculation unit that calculates the position and / or speed of the train based on the transmission / reception interval between the transmission of the pulse wave by the transmission unit and the detection of the reflected wave by the detection unit.
A detection device including the above may be configured.

According to the eighth invention, it is possible to realize a detection device having the action and effect of the first invention.

As the ninth invention
A railroad crossing alarm control device
The detection device of the eighth invention which determines the predetermined position in the railroad crossing or within a predetermined distance from the railroad crossing and detects 1) the position of the train or 2) the position and speed of the train with respect to the railroad crossing.
A timing determination unit that determines the start timing and / or end timing of the alarm control of the railroad crossing based on the detection result by the detection device.
An alarm control device including the above may be configured.

According to the ninth invention, it is possible to realize an alarm control device having the action and effect of the seventh invention.

Application example of alarm control device. Explanatory drawing of train position detection. Explanatory drawing of train speed detection. An example of pulse frequency setting data. An example of alarm start point setting data.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. It should be noted that the embodiments described below do not limit the present invention, and the embodiments to which the present invention can be applied are not limited to the following embodiments. Further, in the description of the drawings, the same elements are designated by the same reference numerals.

[overall structure]
FIG. 1 is an application example of the alarm control device 30 of the present embodiment. As shown in FIG. 1, the alarm control device 30 is installed in the vicinity of the railroad crossing 10 on a railway and controls railroad crossing security equipment such as a railroad crossing cutoff machine 12 and a railroad crossing alarm 14 installed at the railroad crossing 10. Specifically, control is performed such that an alarm is started by the descent of the railroad crossing cutoff machine 12 or the sounding of the railroad crossing alarm 14 when the train traveling on the rail approaches, and then the alarm is stopped when the train passes. The alarm control device 30 has a detection device 40 that detects the position and speed of the train with respect to the railroad crossing 10, and performs alarm control of the railroad crossing 10 based on the position and speed of the train detected by the detection device 40.

[principle]
(A) Detection of Train Position The detection of train position and speed by the detection device 40 will be described. FIG. 2 is a diagram illustrating a train detection method by the detection device 40. Sensing device 40 sends the predetermined position P _i of the rail R of the pulse wave periodically. Predetermined position P _i to send a pulse wave, the distance from the crossing 10 within or crossing 10 is the position of the entry side of the train is within a predetermined distance. A pulse wave is generated by, for example, generating a sine wave signal having a predetermined frequency, a signal obtained by multiplying the sine wave by itself, or a square wave signal, and extracting a signal waveform for half a period of the positive value of the waveform. can do. Of course, the pulse wave is not limited to this. For example, a signal waveform for one cycle including a positive value, zero, and a negative value may be used as a pulse wave, or a half cycle of a triangular wave or a signal waveform for one cycle may be used as a pulse wave. The transmission interval of the pulse wave is set to a sufficiently longer time (for example, 0.1 second or more) than the transmission / reception interval Δt described later. Sensing device 40, the pulse wave is transmitted from a predetermined position P _i of the rail R.

送受信間隔Δｔは、所定位置Ｐ_ｉにおけるパルス波の送信時刻を時刻ｔ_ｉ、反射波の検出時刻を時刻ｔ_ｓとすると、次式（２）で与えられる。

If the train is present on the rail R, since the inter-rail R is short-circuited by wheel shafts of the train, the pulse wave is reflected at the short circuit position P _r, reflected waves at a predetermined position P _i is detected. Distance D from the transmission of the pulse wave at a predetermined position P _i from the transmission and reception interval Δt required until detection of the reflected wave, to the short-circuit position P _r from the predetermined position P _i is obtained by the following equation (1).

Reception interval Δt, the time the transmission time of the pulse wave at a predetermined position P _i t _i, when the time t _s detection time of the reflected wave is given by the following equation (2).

式（３）において、Ｖ_０は光の速度、ε_ｒはレールＲの比誘電率である。 In the formula (1), V _p is the propagation velocity of the electromagnetic wave in the rail R, and is given by the following formula (3).

In equation (3), V ₀ is the speed of light and ε _r is the relative permittivity of the rail R.

This distance D corresponds to the position of the train. That is, the position at a distance D from the predetermined position P _i is the position of the train at the time t _r of the reflected pulse wave is generated (the precise, short position P _r by wheelset of the leading _vehicle) it is. If the predetermined position P _i is represented by kilometrage, by adding or subtracting the distance D to its position, it can be converted to a train position represented by kilometrage. Time t _r reflection occurs for pulse wave is given by the following equation (4).

(B) Detection of train speed In this way, the detection device 40 detects the train position from the transmission / reception interval Δt from the transmission of the pulse wave to the detection of the reflected wave. Furthermore, the pulse wave is transmitted and the reflected wave is detected a plurality of times in succession, and the change in the position where the pulse wave is reflected from the change in each transmission / reception interval Δt, that is, the change in the train position is the train speed. Is detected.

FIG. 3 is a diagram illustrating a method of detecting the speed of a train by the detection device 40. As shown in FIG. 3A, _assuming that the transmission time of the first pulse wave is time _ti1 and the detection time of the reflected wave is time t _s1 , the transmission / reception interval Δt ₁ is Δt ₁ = t _s1- t _i1 . Is. The reflected time _{t r1} reflection occurs in pulse wave, the following expression (5), and the distance _{D 1} of the up position _{P r1} of the reflected occurs, the following expression (6).

Next, as shown in FIG. 3B, _assuming that the transmission time of the second pulse wave is time _ti2 and the detection time of the reflected wave is time t _s2 , the transmission / reception interval Δt ₂ is Δt ₂ = t _s2 −t. _i2 ,. Then, the reflection time _{tr2 at} which the reflection of the pulse wave occurs is given by the following equation (7), and the distance D ₂ to the position _{Pr2 at} which the reflection is generated is given by the following equation (8).

この式（９）を変形して送受信間隔Δｔ_１，Δｔ_２を用いて表すと、次式（１０）となる。つまり、送受信間隔Δｔ_１，Δｔ_２に基づいて列車の速度Ｖを算出することができる。

Therefore, the speed V of the train is given by the following equation (9) from the change of the train position between the times _tr1 and _tr2 .

When this equation (9) is modified and expressed using the transmission / reception intervals Δt ₁ and Δt ₂ , the following equation (10) is obtained. That is, the train speed V can be calculated based on the transmission / reception intervals Δt ₁ and Δt ₂ .

In the case where the train on the rail R is absent, or is the case, but sufficiently distant presence, reflections of the pulse wave does not occur, or the reflected wave at the predetermined position P _i in the pulse wave and the reflected wave is attenuated Is not detected. In this case, it is determined that the train does not exist within the predetermined section of the rail R (specifically, within the track circuit including the predetermined position Pi or within the range of the maximum distance at which the reflected wave can be estimated to be detected).

Further, the traveling direction of the train can be determined by continuously transmitting the pulse wave and detecting the reflected wave a plurality of times. Specifically, the distance D ₂ by the detection of the reflected wave this time is compared with the distance D ₁ by the detection of the reflected wave last time, and if the distance D ₂ this time is smaller than the distance D ₁ last time, the train determined to be approaching a predetermined position P _i, conversely, the larger the better of this distance D ₂ from the previous distance D _1, the train can be determined to stay away from a predetermined position P _i.

(C) Pulse wave control The detection device 40 can intermittently detect the position and speed of a train approaching a railroad crossing 10 by transmitting a pulse wave and detecting the reflected wave a plurality of times in succession. it can. At this time, the pulse frequency (pulse width) of the pulse wave is controlled based on the presence / absence of the reflected wave and the calculated position of the train. Specifically, the pulse frequency is higher when the predetermined short distance condition indicating that the detected train position is close to the predetermined position is satisfied, as compared with the pulse frequency when the reflected wave is not detected. Control. It should be noted that controlling the pulse frequency of the pulse wave corresponds to controlling the pulse width of the pulse wave. That is, increasing the pulse frequency means shortening the pulse width of the pulse wave, and lowering the pulse frequency means increasing the pulse width of the pulse wave.

Since the detection device 40 detects the position and speed of the train approaching the railroad crossing 10, first, in a situation where the train is sufficiently far away and the reflected wave is not detected, the pulse frequency of the pulse wave is set to a predetermined initial frequency. Let F ₀ . Then, the approach of the train, since the position and speed of the train to detect the reflected wave can now detect, in accordance with the detected train position, the pulse frequency of the next pulse wave, from the initial frequency F ₀ Change to a higher pulse frequency.

The pulse frequency can be changed according to the train position, for example, with the short distance condition that the distance from the predetermined position _Pi to the train position is equal to or less than the predetermined distance, and when this short distance condition is satisfied, the pulse frequency is higher. It can be realized by changing to. Further, the correspondence between the train position (corresponding to the distance D from the predetermined position P _i) and the pulse frequency F, and the data table, the distance D in advance in the form such relation to variable (F = f (D)) It may be determined and changed to the pulse frequency F corresponding to the detected train position. Since the train approaches the railroad crossing 10, it is advisable to determine the correspondence so that the pulse frequency F of the pulse wave is gradually increased. This is because the longer the propagation distance of the signal propagating on the rail, the greater the attenuation of the pulse wave waveform and the more difficult it is to detect the reflected wave. Therefore, when the propagation distance is long, the pulse frequency is lowered to increase the pulse width. This is because it is preferable to increase the pulse frequency and shorten the pulse width when the propagation distance is long and the propagation distance is short.

(D) Alarm control start timing The alarm control of a railroad crossing by the alarm control device 30 will be described. The alarm control device 30 controls the start timing and end timing of the alarm control of the railroad crossing 10 based on the position and speed of the train detected by the detection device 40. Specifically, when the train reaches the warning start point set in front of the railroad crossing, the warning control of the railroad crossing is started. The warning start point is set at a position where the railroad crossing is completed with a margin before the train traveling at the maximum speed specified in the line section reaches the railroad crossing. After that, when the train reaches the warning end point set on the advance side of the railroad crossing, the warning control is terminated.

The alarm control device 30 changes the position of the alarm start point according to the speed of the approaching train. Specifically, the slower the speed of the approaching train, the closer the alarm start point is to the railroad crossing 10. Since the detection device 40 detects the position and speed of the train approaching the railroad crossing 10, first, in a situation where the train is sufficiently far away and the reflected wave is not detected, the alarm start point is set to a predetermined initial position P _0. And. This initial position P ₀ is an alarm start position assuming that the train travels at the maximum speed defined in the line section. Then, the approach of the train, since the position and speed of the train to detect the reflected wave can now detect, according to the train speed detected, the position of the warning issue point, level crossings from the initial position P ₀ 10 Change to a position closer to.

The change of the warning start point according to the train speed is, for example, a relational expression (P = f (V)) in which the correspondence relationship between the train speed V and the position of the warning start point P is set as a data table or the train speed V as a variable. ), And the alarm start point may be changed to a position corresponding to the detected train speed.

Further, when the position of the alarm start point is changed according to the detected train speed, the alarm control device 30 determines whether the detected train position has reached the alarm start point together with the train speed. Then, if it has reached, the warning control of the railroad crossing is started immediately, and if it has not reached, the arrival time of the warning start point when traveling at the detected running speed is predicted and the warning start timing is set. To do. After starting the warning control of the railroad crossing 10, the warning control is not ended until the train passes the railroad crossing 10. Similarly, the passage of the railroad crossing 10 of the train is determined by whether the train position has reached the warning end point. When the alarm end point is reached, the alarm control of the railroad crossing 10 is terminated.

In the case of a single track, since trains in both directions pass through the railroad crossing, warning start points and warning end points are provided on both sides of the railroad crossing. As described above, since the alarm control device 30 of the present embodiment can also determine the traveling direction of the train, a train that approaches the railroad crossing from one direction and passes through the railroad crossing is provided on the advance side of the railroad crossing when viewed from the train. When the warning start point for the train in the other direction is reached, unnecessary warning control can be prevented from starting from the direction of travel of the train.

[Functional configuration]
As shown in FIG. 1, the alarm control device 30 detects the position and speed of a train approaching and advancing to the railroad crossing 10, and the railroad crossing based on the position and speed of the train detected by the detection device 40. It has a timing determination unit 32 that determines the start and end timings of the alarm control of the above. The detection device 40 includes a transmission unit 42, a detection unit 44, and a calculation unit 46.

Transmission unit 42 transmits the predetermined position P _i of the rail R, the pulse wave of a predetermined pulse frequency periodically. The transmission timing and pulse frequency of the pulse wave follow the instructions of the calculation unit 46. Further, when transmitting a pulse wave, and outputs the transmission time t _i to the calculation unit 46.

The detection unit 44 detects the reflected wave for the pulse wave generated when the train is on the rail R. Detecting position is the same position P _i and the transmission position of the pulse wave. Detector 44 detects the reflected wave and outputs the detected time t _s to the calculator 46.

The calculation unit 46 calculates the position and speed of the train based on the transmission / reception interval and the change in the transmission / reception interval between the pulse wave transmitted by the transmission unit 42 and the reflected wave detected by the detection unit 44. Specifically, the transmission time t _i of the pulse wave by the transmitting unit 42 obtains an elapsed time until the detection time t _s of the reflected wave by the detector 44 as a reception interval Delta] t, according to equation (1), the predetermined position P _i The distance D from to the position where the reflection occurred is calculated, and the train position is calculated based on this distance D. Further, the train speed is calculated according to the equations (9) and (10).

In addition, the calculation unit 46 controls the transmission timing and pulse frequency of the pulse wave by the transmission unit 42. The transmission timing is controlled so that the time interval from the transmission time of the current pulse wave to the transmission time of the next pulse wave is longer than the predetermined transmission standby time. Transmission waiting time, the pulse wave, the reflected wave when reflected by the end portion of the entrance side of the detection target section is the time, required to reach the predetermined position P _i. The detection target section is a section for which the detection device 40 detects the position and speed of the train, and specifically, the length including the warning start point when the train travels at the maximum speed defined in the line section. It is defined as a section in consideration of the attenuation of pulse waves and the presence or absence of insulating seams.

The pulse frequency is controlled according to the calculated train position. That, and send the pulse wave in a situation where the reflected wave is not detected, the pulse frequency and a predetermined initial frequency F _0. After that, when the reflected wave is detected and the train position is calculated, the pulse frequency F corresponding to the calculated train position is set as the pulse frequency of the next pulse wave according to the pulse frequency setting data 48.

FIG. 4 shows an example of the pulse frequency setting data 48. Pulse frequency setting data 48 is, for example, as shown in FIG. 4 (a), the distance D from the predetermined position P _i to the reflection position of the pulse wave corresponding to the train position data table that associates a pulse frequency F May be. Alternatively, a relational expression (F = f1 (D), f2 (D)) representing a graph of the relationship between the distance D and the pulse frequency F as shown in FIG. 4B may be used. In each of the correspondence relationships, the pulse frequency F is set to decrease as the distance D increases.

Further, the calculation unit 46 determines the traveling direction of the train based on the change in the distance D from the initial position _Pi to the position where the reflection of the pulse wave occurs. Specifically, the distance D ₂ due to the detection of the reflected wave this time is compared with the distance D ₁ due to the detection of the reflected wave last time, and if the distance D ₂ this time is smaller than the distance D ₁ last time, the train approaching the predetermined position P _i, that is, have progressed toward the crossing 10, conversely, the larger the better of this distance D ₂ from the previous distance D _1, train away from a predetermined position P _i That is, it can be determined that the train has passed the railroad crossing 10 and is traveling in the direction away from the railroad crossing 10.

The timing determination unit 32 determines the start timing and end timing of the alarm control of the railroad crossing 10 based on the position and speed of the train which is the detection result of the detection device 40. Specifically, the warning start point is changed and set at a position corresponding to the detected train speed according to the warning start point setting data 34.

FIG. 5 shows an example of the alarm start point setting data 34. The warning start point setting data 34 may be, for example, a data table in which the train speed V and the distance L from the railroad crossing 10 to the warning start point are associated with each other, as shown in FIG. 5A. Alternatively, a relational expression (L = f3 (V), f4 (V)) representing a graph of the relationship between the train speed V and the distance L as shown in FIG. 5B may be used. In each of the correspondence relationships, the distance L becomes longer as the train speed V becomes faster.

The timing determination unit 32 determines whether the detected train position has reached the set alarm start point, and if so, determines that the alarm control start timing has arrived, and immediately determines that the alarm control start timing has arrived. , The alarm control is started for the railroad crossing security equipment of the railroad crossing 10. If the train position has not reached the warning start point, the arrival time of the warning start point when traveling at the detected running speed is predicted and used as the start timing of the warning control. After that, it is determined whether the train position has reached the predetermined alarm end point, and if so, it is determined that the end timing of the alarm control has arrived, and the alarm control is performed for the railroad crossing security equipment of the railroad crossing 10. To end.

The alarm start point may be a fixed position regardless of the train speed. In this case, the timing determination unit 32 determines whether the detected train position has reached the alarm start point, and determines whether the alarm control start timing has arrived. That is, the start timing and the end timing of the warning control of the railroad crossing are determined based on the position of the train which is the detection result of the detection device 40.

[Action effect]
In this manner, according to the warning control device 30 of the present embodiment, a simple method such as by sending a pulse wave from a predetermined position P _i of the rail R for detecting the reflected wave, the train from the ground in a predetermined position Position and speed can be detected. Further, since the start and end timings of the alarm control of the railroad crossing 10 can be determined based on the detected position and speed of the train, the control that shortens the railroad crossing cutoff time becomes possible.

[Modification example]
It should be noted that the embodiment to which the present invention can be applied is not limited to the above-described embodiment, and of course, it can be appropriately changed without departing from the spirit of the present invention.

For example, a plurality of types of pulse waves having different pulse frequencies may be superposed, or may be sequentially switched and transmitted alternately. Specifically, the first pulse wave having the first pulse frequency F1 and the second pulse wave having the second pulse frequency F2 higher than the first pulse frequency F1 are superposed or sequentially switched. It is transmitted alternately, and the first reflected wave with respect to the first pulse wave and the second reflected wave with respect to the second pulse wave are detected as reflected waves. Then, the position and speed of the train based on the first transmission / reception situation, which is the time change between the transmission / reception interval between the first pulse wave and the first reflected wave and the transmission / reception interval, and the second pulse wave and the second reflected wave. The position and speed of the train based on the second transmission / reception situation, which is the time change of the transmission / reception interval and the transmission / reception interval, are calculated, and the final position and speed of the train are determined from these. As far condition indicating that the train position is far from the predetermined position P _i that distance from a predetermined position P _i of the train position detection last is the predetermined distance or more, if long distance condition is satisfied, the first employing the position and speed of the train based on the reception status, as short-range condition indicating that the train position is close to the predetermined position P _i that distance from a predetermined position P _i of the train position the previously detected is the predetermined distance or less When the short-distance condition is satisfied, the position and speed of the train can be detected more accurately by adopting the position and speed of the train based on the second transmission / reception situation. Alternatively, either one may be adopted, such as the one with the smaller degree of attenuation of the detected reflected wave, or the average value of both may be obtained.

In the above-described embodiment, an example of using the detected train position and speed for railroad crossing control has been described. However, the form in which the detected train position and speed can be used is not limited to the railroad crossing control described above. For example, the above-described embodiment may be applied to a form for detecting whether or not a train has stopped at a fixed position of a station, and when a stop at a fixed position is detected, a platform door (platform fence) may be controlled. Good. Specifically, when the train position is near the stop position target and the train speed is zero, that is, when the train stops, the door of the home fence is opened and controlled.

Further, for the detection of the reflected wave by the detection unit 44, a known technique can be appropriately used, but a so-called machine learning technique for accumulating and learning the waveform data of the detected reflected wave may be applied.

10 ... Railroad crossing 12 ... Railroad crossing breaker, 14 ... Railroad crossing alarm 30 ... Alarm control device 32 ... Timing determination unit, 34 ... Alarm start point setting data 40 ... Detection device 42 ... Transmission unit, 44 ... Detection unit 46 ... Calculation unit, 48 ... Pulse frequency setting data R ... Rail

Claims (9)

A detection method that detects the position and / or speed of a train traveling on a rail.
Periodically transmitting a pulse wave of a predetermined pulse frequency from a predetermined position on the rail,
To detect the reflected wave with respect to the pulse wave generated when the train is on the rail at the predetermined position, and
To calculate the position and / or speed of the train based on the transmission / reception interval between the pulse wave and the detected reflected wave.
Detection method including. Controlling the pulse frequency based on the presence / absence of the detection of the reflected wave and the calculated position of the train.
The detection method according to claim 1, further comprising. Controlling the pulse frequency satisfies a predetermined short-distance condition indicating that the calculated position of the train is closer to the predetermined position than the frequency when the reflected wave is not detected. Including controlling the frequency to be higher,
The detection method according to claim 2. The transmission involves superimposing the first pulse wave having the first pulse frequency and the second pulse wave having the second pulse frequency higher than the first pulse frequency, or sequentially switching the transmission. Including doing
The detection includes detecting a first reflected wave with respect to the first pulse wave and a second reflected wave with respect to the second pulse wave.
The calculation is the first transmission / reception situation including the transmission / reception interval between the first pulse wave and the detected first reflected wave, and the second pulse wave and the detected second reflection. Including calculating the position and / or speed of the train based on a second transmission / reception situation including a transmission / reception interval with a wave.
The detection method according to claim 1. The above calculation is
When a predetermined long distance condition indicating that the position of the train is far from the predetermined position is satisfied, the position and / or speed of the train is calculated based on the first transmission / reception situation.
When the predetermined short distance condition indicating that the position of the train is close to the predetermined position is satisfied, the position and / or speed of the train is calculated based on the second transmission / reception situation.
including,
The detection method according to claim 4. Determining the presence or absence of a train in a predetermined section based on the presence or absence of the detection of the reflected wave.
The detection method according to any one of claims 1 to 5, further comprising. This is a railroad crossing alarm control method.
The predetermined position is determined within the railroad crossing or within a predetermined distance from the railroad crossing, and 1) the position of the train or 2) the position and speed of the train with respect to the railroad crossing is described in any one of claims 1 to 6. To detect by the detection method of
Determining the start timing and / or end timing of the warning control of the railroad crossing based on the detection result.
Alarm control methods including. A detection device that detects the position and / or speed of a train running on a rail.
A transmitter that periodically transmits a pulse wave of a predetermined pulse frequency from a predetermined position on the rail,
A detection unit that detects a reflected wave with respect to the pulse wave generated when the train is on the rail at the predetermined position, and a detection unit.
A calculation unit that calculates the position and / or speed of the train based on the transmission / reception interval between the transmission of the pulse wave by the transmission unit and the detection of the reflected wave by the detection unit.
Detection device equipped with. A railroad crossing alarm control device
The detection device according to claim 8, wherein the predetermined position is determined within the railroad crossing or within a predetermined distance from the railroad crossing, and 1) the position of the train or 2) the position and speed of the train with respect to the railroad crossing.
A timing determination unit that determines the start timing and / or end timing of the alarm control of the railroad crossing based on the detection result by the detection device.
Alarm control device equipped with.

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