JP5732554B1 - Railroad crossing backup device and railroad crossing backup system - Google Patents

Railroad crossing backup device and railroad crossing backup system Download PDF

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JP5732554B1
JP5732554B1 JP2014019967A JP2014019967A JP5732554B1 JP 5732554 B1 JP5732554 B1 JP 5732554B1 JP 2014019967 A JP2014019967 A JP 2014019967A JP 2014019967 A JP2014019967 A JP 2014019967A JP 5732554 B1 JP5732554 B1 JP 5732554B1
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長谷川　敏明
敏明 長谷川
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Kyosan Electric Manufacturing Co Ltd
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Abstract

【課題】点制御方式による踏切警報の列車検知をバックアップする踏切バックアップ装置を、低コストに実現できるようにすること。【解決手段】一方のレールＲ１には、踏切道１０から所定距離Ｌ２分離れた位置に絶縁継目３０が設けられる。踏切バックアップ装置４０は、絶縁継目３０から警報開始点Ｐ１側に接近検知信号ｆ１を送信し、警報終止点Ｐ２側に進出検知信号ｆ２を送信する。そして、他方のレールＲ２からこれらの検知信号を受信することで、踏切道１０への列車の接近及び進出を判定する。接近検知信号ｆ１、及び、進出検知信号ｆ２は、搬送周波数ｆ０が２００Ｈｚ以下の低周波の搬送波を、互いに異なるＰＮ符号を用いてＳＳＢ変調（抑圧搬送波単側波帯変調）することで生成された信号である。【選択図】図１A crossing backup device for backing up train detection of a crossing warning by a point control method can be realized at low cost. One rail R1 is provided with an insulation seam 30 at a position separated by a predetermined distance L2 from the railroad crossing 10. The railroad crossing backup device 40 transmits an approach detection signal f1 from the insulation joint 30 to the alarm start point P1 and transmits an advance detection signal f2 to the alarm end point P2. And the approach and advance of the train to the railroad crossing 10 are determined by receiving these detection signals from the other rail R2. The approach detection signal f1 and the advance detection signal f2 are generated by subjecting a low-frequency carrier having a carrier frequency f0 of 200 Hz or less to SSB modulation (suppressed carrier single sideband modulation) using different PN codes. Signal. [Selection] Figure 1

Description

本発明は、点制御方式による踏切警報の列車検知をバックアップする踏切バックアップ装置等に関する。   The present invention relates to a railroad crossing backup device that backs up train detection of a railroad crossing alarm by a point control method.

鉄道の踏切道には、踏切警報機や踏切遮断機、これらの動作を制御する踏切制御装置を含む踏切保安装置が設けられる。踏切道へ接近している列車の検知方式には、連続閉電路方式、及び、点制御方式の二通りがある。連続閉電路方式は、踏切警報区間全体に軌道回路を設置し、区間内の列車を連続的に検知する方式である。点制御方式は、警報開始点や警報終止点に、踏切制御子等の列車検知器を設置し、チェックイン・チェックアウトによって踏切警報区間への列車の進入・進出（通過）を検知する方式である（例えば、特許文献１参照）。   A railroad crossing road is provided with a railroad crossing safety device including a railroad crossing alarm, a railroad crossing breaker, and a railroad crossing control device for controlling these operations. There are two types of detection methods for a train approaching a railroad crossing: a continuous closed circuit method and a point control method. The continuous closed circuit system is a system in which a track circuit is installed in the entire level crossing warning section and trains in the section are continuously detected. In the point control method, train detectors such as level crossing controllers are installed at the alarm start point and alarm end point, and the approach / exit (passage) of the train to the level crossing alarm section is detected by check-in / check-out. Yes (see, for example, Patent Document 1).

特開２０１２−９６７０５号公報JP 2012-96705 A

点制御方式の列車検知器である踏切制御子は、列車の車輪がレールを短絡することで列車を検知する方式であり、レール上面における錆の発生や落ち葉の付着などによる短絡不良が発生する可能性が有る。短絡不良が発生した場合に列車検知をバックアップするために、踏切バックアップ装置が設けられる場合がある。   The railroad crossing controller, which is a point-controlled train detector, detects the train by the train wheels short-circuiting the rail, which may cause short-circuit failure due to rust or fallen leaves on the rail top surface. There is sex. A crossing backup device may be provided to back up train detection when a short circuit failure occurs.

踏切バックアップ装置としては、主に、警報開始点に、列車に搭載されているＡＴＳ車上装置からのＡＴＳ信号を受信するＡＴＳ地上子を設置する方式と、警報終止点に、車軸（輪軸）の通過を検知する車軸検知器を設置する方式とがあり、何れもレール短絡によらない方式である。但し、これらの方式はフェールセーフ性を有していないため、あくまでもバックアップとして用いられる。   As a railroad crossing backup device, mainly, an ATS ground unit that receives an ATS signal from an ATS onboard device mounted on a train is installed at the alarm start point, and an axle (wheel axle) is installed at the alarm end point. There is a method of installing an axle detector that detects passage, and any method is not based on rail short-circuiting. However, since these methods do not have fail-safe properties, they are used only as a backup.

また、これらの踏切バックアップ装置（ＡＴＳ地上子や車軸検知器）は、信号伝達のため、踏切制御装置と信号ケーブルで接続する必要がある。通常、警報開始点から踏切道までの距離は、１〜２ｋｍ程度と長距離であり、踏切道から警報終止点までの距離も含めると相当の距離であるため、信号ケーブルの布設や保守には相応のコストがかかる。また、踏切は多数存在し、その全てに踏切バックアップ装置を設ける必要があるため、鉄道会社にとっては信号ケーブルの布設や保守に要するコストは多大となる。踏切バックアップ装置は、あくまでもバックアップであるので、可能な限りコストをかけずに実現したいという要望がある。   Further, these crossing backup devices (ATS ground unit and axle detector) need to be connected to the crossing control device with a signal cable for signal transmission. Usually, the distance from the alarm start point to the railroad crossing is a long distance of about 1 to 2 km, and it is a considerable distance including the distance from the railroad crossing road to the alarm stop point. There is a corresponding cost. In addition, since there are many railroad crossings and it is necessary to provide a railroad crossing backup device for all of them, the cost required for laying and maintaining the signal cable is great for a railway company. Since the railroad crossing backup device is a backup to the last, there is a demand to realize it without cost as much as possible.

本発明は上記事情に鑑みてなされたものであり、その目的とするところは、点制御方式による踏切警報の列車検知をバックアップする踏切バックアップ装置を、低コストに実現できるようにすることである。   The present invention has been made in view of the above circumstances, and an object of the present invention is to realize a railroad crossing backup device that backs up train detection of a railroad crossing alarm by a point control method at low cost.

上記課題を解決するための第１の発明は、
点制御方式による踏切警報の警報開始点および警報終止点での列車検知をバックアップする踏切バックアップ装置であって、
踏切道から前記警報終止点側に所定距離離れた位置の一方レールのみに絶縁継目が設けられ、
前記絶縁継目を挟んで前記一方レールの前記踏切道側に接近検知信号を送信する接近検知用送信手段と、
前記絶縁継目を挟んで前記一方レールの前記踏切道と反対側に進出検知信号を送信する進出検知用送信手段と、
前記絶縁継目が設けられていない他方レールから前記接近検知信号を受信する接近検知用受信手段と、
前記他方レールから前記進出検知信号を受信する進出検知用受信手段と、
前記接近検知用受信手段による前記接近検知信号の受信状況に基づいて、前記踏切道への列車の接近を判定する接近判定手段と、
前記接近検知用受信手段による前記接近検知信号の受信状況、及び、前記進出検知用受信手段による前記進出検知信号の受信状況に基づいて、前記踏切道からの列車の進出を判定する進出判定手段と、
を備えた踏切バックアップ装置である。 The first invention for solving the above-described problems is
A railroad crossing backup device that backs up the train detection at the alarm start point and alarm end point of the railroad crossing alarm by the point control method,
An insulation seam is provided only on one rail at a predetermined distance from the railroad crossing to the warning end point side,
An approach detection transmitting means for transmitting an approach detection signal to the railroad crossing side of the one rail across the insulation seam;
An advancing detection transmitting means for transmitting an advancing detection signal to the side opposite to the railroad crossing of the one rail across the insulation seam;
An approach detection receiving means for receiving the approach detection signal from the other rail not provided with the insulation seam;
An advance detection receiving means for receiving the advance detection signal from the other rail;
Based on the reception status of the approach detection signal by the approach detection receiving means, an approach determination means for determining approach of the train to the railroad crossing,
Advancing determination means for determining whether a train has advanced from the railroad crossing based on a reception situation of the approach detection signal by the proximity detection receiving means and a reception situation of the advance detection signal by the advance detection receiving means; ,
Is a railroad crossing backup device.

この第１の発明によれば、踏切バックアップ装置は、一方レールに設けられた絶縁継目を挟んで、一方レールの踏切道側に接近検知信号を送信し、踏切道と反対側に進出検知信号を送信する。そして、他方のレールからの、接近検知信号、及び、進出検知信号それぞれの受信状況に基づいて、踏切道への列車の接近、及び、進出を判定する、絶縁継目は、一方レールの踏切道から警報終止点側に、所定距離離れた位置に設けられている。これにより、他方レールからの接近検知信号の受信によって、踏切道への列車の接近を判定し、他方レールからの進出検知信号の受信および接近検知信号の受信断によって、踏切道からの列車の進出を判定することができる。したがって、接近検知用送信手段、進出検知用送信手段、接近検知用受信手段および進出検知用受信手段は、何れも、絶縁継目付近のレールに信号を送信したり、受信したりするものであるため、これらを１箇所にまとめることができる。そのため、警報開始点および警報終止点それぞれに分散配置せずに済み、信号ケーブルの布設量を大幅に低減することができる。加えて、第１の発明の踏切バックアップ装置は、列車の踏切道への接近から進出までを連続的に検知することができるため、点制御方式による列車検知のバックアップとして有効である。   According to the first aspect of the present invention, the railroad crossing backup device transmits an approach detection signal to the railroad crossing side of the one rail across the insulation joint provided on the rail, and sends an advance detection signal to the opposite side of the railroad crossing. Send. Then, based on the reception status of the approach detection signal and the advance detection signal from the other rail, it is determined whether the train is approaching and entering the railroad crossing. It is provided at a position away from the alarm end point by a predetermined distance. Thereby, the approach of the train to the railroad crossing is determined by receiving the approach detection signal from the other rail, and the train advances from the railroad crossing by receiving the advance detection signal from the other rail and receiving the approach detection signal. Can be determined. Therefore, the approach detection transmission means, the advance detection transmission means, the approach detection reception means, and the advance detection reception means all transmit and receive signals to the rail near the insulation joint. These can be collected in one place. For this reason, it is not necessary to disperse the alarm start point and the alarm end point, and the amount of signal cables installed can be greatly reduced. In addition, the railroad crossing backup device according to the first aspect of the invention is effective as a backup of train detection by the point control method because it can continuously detect from approach to advancement of a railroad crossing.

また、第２の発明として、第１の発明の踏切バックアップ装置であって、
前記接近検知用送信手段は、搬送周波数が２００Ｈｚ以下且つ５０Ｈｚ以上であり、第１の周期符号を送信する信号を前記接近検知信号として送信し、
前記進出検知用送信手段は、搬送周波数が２００Ｈｚ以下且つ５０Ｈｚ以上であり、前記第１の周期符号とは異なる第２の周期符号を送信する信号を前記進出検知信号として送信する、
踏切バックアップ装置を構成しても良い。 Moreover, as 2nd invention, it is the crossing backup device of 1st invention,
The approach detection transmitting means transmits a signal for transmitting a first periodic code as the approach detection signal, with a carrier frequency of 200 Hz or less and 50 Hz or more,
The advancing detection transmitting means transmits a signal that transmits a second periodic code different from the first periodic code as the advancing detecting signal, with a carrier frequency of 200 Hz or lower and 50 Hz or higher.
A crossing backup device may be configured.

この第２の発明によれば、接近検知信号、及び、進出検知信号は、搬送周波数が２００Ｈｚ以下であり、互いに異なる周期符号を送信する信号である。つまり、警報開始点や警報終止点は、通常、踏切道から相当の距離離れた位置に定められるが、接近検知信号、及び、進出検知信号は、搬送周波数が２００Ｈｚ以下と低周波の信号であるため、長距離伝送が可能である。また、接近検知信号、及び、進出検知信号は、それぞれ異なる周期符号を送信する信号であるため、混信したとしてもどちらの検知信号であるかを区別して他方レールから受信することができる。   According to the second aspect of the invention, the approach detection signal and the advance detection signal are signals for transmitting different periodic codes having a carrier frequency of 200 Hz or less. That is, the alarm start point and the alarm end point are usually determined at a position that is a considerable distance away from the railroad crossing, but the approach detection signal and the advance detection signal are low frequency signals with a carrier frequency of 200 Hz or less. Therefore, long distance transmission is possible. Further, since the approach detection signal and the advance detection signal are signals that transmit different periodic codes, respectively, even if there is interference, it is possible to distinguish which detection signal is received from the other rail.

更に、第３の発明として、
第１又は第２の発明の踏切バックアップ装置と、
前記踏切道から前記警報終止点側に所定距離離れた位置の一方レールのみに設けた絶縁継目と、
を具備した踏切バックアップシステムを構成しても良い。 Furthermore, as a third invention,
A railroad crossing backup device according to the first or second invention;
An insulating seam provided only on one rail at a predetermined distance from the railroad crossing to the alarm end point;
A railroad crossing backup system including the above may be configured.

踏切バックアップ装置の概要図。Schematic diagram of a crossing backup device. 踏切バックアップ装置の内部構成図。The internal block diagram of a level crossing backup apparatus.

図１は、本実施形態における踏切バックアップ装置４０の概要図である。本実施形態の踏切バックアップ装置４０は、地方の閑散線区などの駅間に軌道回路が設置されず基本的に点制御方式の列車検知で踏切制御が行われる踏切道１０を対象とし、その列車検知のバックアップとして用いられる。   FIG. 1 is a schematic diagram of a crossing backup device 40 according to this embodiment. The railroad crossing backup device 40 according to the present embodiment is intended for a railroad crossing 10 in which a railroad circuit is not installed between stations in a quiet area in a rural area and the railroad crossing control is basically performed by train detection using a point control method. Used as a backup for detection.

踏切道１０には、踏切警報機１２や踏切遮断機１４と、これらの動作を制御する踏切警報制御装置２０とが設けられている。また、点制御方式の列車検知を行うため、踏切道１０から所定距離Ｌ１だけ離れた列車の進入側の警報開始点Ｐ１に、閉電路方式の踏切制御子１６が設けられているとともに、踏切道１０から所定距離だけ離れた列車の進出側の警報終止点Ｐ２に、開電路方式の踏切制御子１８が設けられている。   The level crossing 10 is provided with a level crossing alarm 12 and a level crossing breaker 14, and a level crossing alarm control device 20 for controlling these operations. In order to perform point control type train detection, a railroad crossing controller 16 is provided at the alarm start point P1 on the approaching side of the train that is separated from the railroad crossing 10 by a predetermined distance L1. An open circuit type railroad crossing controller 18 is provided at the alarm stop point P2 on the advancing side of the train that is a predetermined distance away from the train 10.

列車が踏切道１０に接近して警報区間に進入すると、踏切制御子１６が列車の通過を検知し、列車検知信号を踏切警報制御装置２０に出力する。踏切警報制御装置２０は、踏切制御子１６から列車検知信号が入力されると、踏切警報機１２の鳴動を開始させるとともに、踏切遮断機１４を駆動して遮断棹を降下させる。次いで、列車が警報区間を進出すると、踏切制御子１８が列車の通過を検知し、列車検知信号を踏切警報制御装置２０に出力する。踏切警報制御装置２０は、踏切制御子１８から列車検知信号が入力されると、踏切警報機１２の鳴動を停止させるとともに、踏切遮断機１４を駆動して遮断棹を上昇させる。   When the train approaches the railroad crossing 10 and enters the warning zone, the railroad crossing controller 16 detects the passage of the train and outputs a train detection signal to the railroad crossing warning control device 20. When a train detection signal is input from the crossing controller 16, the crossing warning control device 20 starts ringing of the crossing warning device 12 and drives the crossing barrier 14 to lower the barrier bar. Next, when the train advances into the warning section, the level crossing controller 18 detects the passage of the train and outputs a train detection signal to the level crossing warning control device 20. When a train detection signal is input from the level crossing controller 18, the level crossing warning control device 20 stops ringing of the level crossing alarm 12 and drives the level crossing breaker 14 to raise the barrier bar.

しかし、踏切制御子１６，１８を用いた列車検知には、車輪とレールの接触不良や、踏切制御子１６，１８の故障等による検知不良が発生し得る。本実施形態の踏切バックアップ装置４０は、列車検知をバックアップするために設けられ、踏切道１０への列車の接近及び進出（通過）を検知して、検知結果を踏切警報制御装置２０に出力する。そのため、踏切警報制御装置２０は、基本的には、踏切制御子１６，１８からの信号をもとに、踏切警報機１２や踏切遮断機１４を制御するが、補助的に踏切バックアップ装置４０からの信号をも利用する。利用形態としては、例えば、踏切制御子１６，１８からの信号と、踏切バックアップ装置４０からの信号とのＯＲ条件を利用して、踏切警報機１２や踏切遮断機１４を制御することとしてもよいし、踏切制御子１６，１８からの故障信号等の入力をもって、踏切バックアップ装置４０からの信号に基づく制御に切り替えることとしてもよい。   However, in the train detection using the railroad crossing controllers 16 and 18, there may be a detection failure due to a contact failure between wheels and rails, a failure of the railroad crossing controllers 16 and 18, or the like. The railroad crossing backup device 40 according to the present embodiment is provided to back up the train detection, detects the approach and advancement (passage) of the train to the railroad crossing 10, and outputs the detection result to the railroad crossing alarm control device 20. Therefore, the level crossing alarm control device 20 basically controls the level crossing alarm 12 and the level crossing breaker 14 on the basis of signals from the level crossing controllers 16 and 18, but supplementarily from the level crossing backup device 40. This signal is also used. As a usage form, for example, the crossing alarm 12 and the crossing breaker 14 may be controlled using the OR condition of the signals from the crossing controllers 16 and 18 and the signal from the crossing backup device 40. Then, it is possible to switch to control based on a signal from the crossing backup device 40 by inputting a failure signal or the like from the crossing controllers 16 and 18.

軌道Ｒには、踏切道１０から警報終止点Ｐ２側に所定距離Ｌ２だけ離れた位置において、一方のレールのみに絶縁継目３０が設けられている。そして、踏切バックアップ装置４０は、この絶縁継目３０の近傍に設置される。また、踏切バックアップ装置４０と絶縁継目３０とで、踏切バックアップシステムを構成する。なお、所定距離Ｌ２は、例えば、当該路線を走行する列車の最大編成長（すなわち列車長）以上としてもよいが、それより短い距離としてもよい。   On the track R, the insulation seam 30 is provided only on one rail at a position separated from the railroad crossing 10 by the predetermined distance L2 toward the alarm end point P2. The railroad crossing backup device 40 is installed in the vicinity of the insulation joint 30. Further, the railroad crossing backup device 40 and the insulation joint 30 constitute a railroad crossing backup system. The predetermined distance L2 may be, for example, not less than the maximum train growth (that is, the train length) of the train traveling on the route, but may be a shorter distance.

図２に示すように、踏切バックアップ装置４０は、一方のレールＲ１の絶縁継目３０から警報開始点Ｐ１側に接近検知信号ｆ１を送信し、絶縁継目３０から警報終止点Ｐ２側に進出検知信号ｆ２を送信する。そして、他方のレールＲ２から、接近検知信号ｆ１及び進出検知信号ｆ２（以下、包括して「検知信号」という）を受信することで、列車の接近及び進出（通過）を検知する。   As shown in FIG. 2, the railroad crossing backup device 40 transmits an approach detection signal f1 from the insulation joint 30 of one rail R1 to the alarm start point P1 side, and an advance detection signal f2 from the insulation joint 30 to the alarm end point P2 side. Send. Then, the approach detection signal f1 and the advance detection signal f2 (hereinafter collectively referred to as "detection signal") are received from the other rail R2, thereby detecting the approach and advance (passing) of the train.

少なくとも警報区間に列車が存在しない場合には、レールが短絡されないため、踏切バックアップ装置４０では、何れの検知信号も受信されない。列車が踏切道１０に接近すると、絶縁継目３０の警報開始点Ｐ１側において、列車の車軸によってレールが短絡され、一方のレールに流れている接近検知信号ｆ１が他方のレールに流れ、踏切バックアップ装置４０が接近検知信号ｆ１を受信する。このとき、絶縁継目３０の警報終止点側ではレールは短絡されないので、踏切バックアップ装置４０では進出検知信号ｆ２が受信されない。踏切バックアップ装置４０は、接近検知信号ｆ１の受信によって列車の接近を検知する。   When there is no train at least in the warning section, the rail is not short-circuited, and thus the crossing backup device 40 does not receive any detection signal. When the train approaches the railroad crossing 10, the rail is short-circuited by the train axle on the alarm start point P1 side of the insulation joint 30, and the approach detection signal f1 flowing in one rail flows in the other rail, and the railroad crossing backup device 40 receives the approach detection signal f1. At this time, since the rail is not short-circuited on the alarm end point side of the insulation joint 30, the crossing backup device 40 does not receive the advance detection signal f2. The crossing backup device 40 detects the approach of the train by receiving the approach detection signal f1.

続いて、列車が進行して絶縁継目３０を越える（詳細には、先頭の車軸が絶縁継目３０を越える）と、絶縁継目３０の警報終止点Ｐ２側において、列車の車軸によってレールが短絡され、一方のレールＲ１に流れている進出検知信号ｆ２が他方のレールＲ２に流れ、踏切バックアップ装置４０が進出検知信号ｆ２を受信する。   Subsequently, when the train travels and exceeds the insulation joint 30 (specifically, the leading axle exceeds the insulation joint 30), the rail is short-circuited by the train axle at the alarm end point P2 side of the insulation joint 30; The advance detection signal f2 flowing in one rail R1 flows in the other rail R2, and the level crossing backup device 40 receives the advance detection signal f2.

列車が更に進行して完全に絶縁継目３０を越えると（詳細には、最後尾の車両の最後尾の車輪が絶縁継目３０を越えると）、踏切バックアップ装置４０では、受信していた接近検知信号ｆ１が受信できなくなる。換言すると、列車が完全に絶縁継目３０の内方に進入するまでは（詳細には、最後尾の車軸が絶縁継目３０を越えるまでは）、踏切バックアップ装置４０は、継続的に接近検知信号ｆ１を受信している。踏切バックアップ装置４０は、進出検知信号ｆ２の受信と、接近検知信号ｆ１の受信断とによって、列車の踏切道１０からの進出（通過）を検知する。   When the train further travels and completely exceeds the insulation joint 30 (specifically, when the last wheel of the last vehicle passes the insulation joint 30), the crossing backup device 40 receives the approach detection signal received. f1 cannot be received. In other words, the railroad crossing backup device 40 continues to detect the approach detection signal f1 until the train completely enters the inside of the insulation joint 30 (specifically, until the last axle crosses the insulation joint 30). Is receiving. The railroad crossing backup device 40 detects advancement (passing) from the railroad crossing 10 by receiving the advance detection signal f2 and the reception interruption of the approach detection signal f1.

検知信号（接近検知信号ｆ１および進出検知信号ｆ２）は、所定周波数ｆ０の搬送波を、周期的な（巡回性を有する）符号であるＰＮ（Pseudo Noise：擬似雑音）符号で変調することで生成された信号である。   The detection signals (the approach detection signal f1 and the advance detection signal f2) are generated by modulating a carrier wave having a predetermined frequency f0 with a PN (Pseudo Noise) code which is a periodic (cyclic) code. Signal.

踏切道１０から警報開始点Ｐ１までの距離は、主に、列車の最高速度や最大減速度をもとに定められ、通常、最大２ｋｍ程度の距離とされる。接近検知信号ｆ１は、絶縁継目３０付近から一方のレールＲ１に送信され、警報開始点Ｐ１まで到達し、左右のレール間の短絡によって他方のレールＲ２を伝達して、再度、絶縁継目３０付近（より正確には、レールＲ１の絶縁継目３０に対向するレールＲ２の位置付近）まで戻ってくる必要がある。つまり、最大４ｋｍ程度の距離を伝達される必要がある。このため、搬送波は、長距離伝送に適した低周波数の信号が望ましく、具体的には、周波数ｆ０が「５０Ｈｚ以上２００Ｈｚ以下」の信号を用いるのが好適である。   The distance from the railroad crossing 10 to the warning start point P1 is mainly determined based on the maximum speed and the maximum deceleration of the train, and is usually a distance of about 2 km at the maximum. The approach detection signal f1 is transmitted from the vicinity of the insulation joint 30 to one rail R1, reaches the alarm start point P1, transmits the other rail R2 by a short circuit between the left and right rails, and again near the insulation joint 30 ( More precisely, it is necessary to return to the vicinity of the position of the rail R2 facing the insulating joint 30 of the rail R1. That is, it is necessary to transmit a distance of about 4 km at the maximum. For this reason, the carrier wave is desirably a low-frequency signal suitable for long-distance transmission, and specifically, a signal having a frequency f0 of “50 Hz or more and 200 Hz or less” is preferably used.

また、踏切バックアップ装置４０において、接近検知信号ｆ１と進出検知信号ｆ２とを区別して受信する必要がある。このため、接近検知信号ｆ１に用いる接近検知用のＰＮ符号（第１の周期符号）と、進出検知信号ｆ２に用いる進出検知用のＰＮ符号（第２の周期符号）とは、異なる符号系列が用いられる。また、これらのＰＮ符号は、伝播時間や受信時の符号一致の判定精度を考慮して符号数が数ビットの符号系列とする。   Further, the crossing backup device 40 needs to distinguish and receive the approach detection signal f1 and the advance detection signal f2. For this reason, the PN code (first period code) for approach detection used for the approach detection signal f1 and the PN code (second period code) for advance detection used for the advance detection signal f2 have different code sequences. Used. In addition, these PN codes are code sequences having a code number of several bits in consideration of propagation time and determination accuracy of code match at the time of reception.

また、変調方式としては、振幅変調の一種であり、小電力での送信が可能な抑圧搬送波単側波帯（ＳＳＢ−ＳＣ：Single Sideband Suppressed Carrier。以下、単に「ＳＳＢ」という）が用いられる。   As a modulation method, a suppressed carrier single sideband (SSB-SC: Single Sideband Suppressed Carrier; hereinafter simply referred to as “SSB”), which is a kind of amplitude modulation and can be transmitted with low power, is used.

図２によれば、踏切バックアップ装置４０は、搬送波生成部４２と、ＰＮ符号生成部４４と、ＳＳＢ変調部４６と、送信部４８と、受信部５０と、ＳＳＢ復調部５２と、ＰＮ符号判定部５４と、列車検知部５６とを備えて構成される。   According to FIG. 2, the crossing backup device 40 includes a carrier generation unit 42, a PN code generation unit 44, an SSB modulation unit 46, a transmission unit 48, a reception unit 50, an SSB demodulation unit 52, and a PN code determination. Unit 54 and a train detection unit 56.

搬送波生成部４２は、発振回路を有し、所定の搬送周波数ｆ０の搬送波を生成する。   The carrier wave generation unit 42 includes an oscillation circuit and generates a carrier wave having a predetermined carrier frequency f0.

ＰＮ符号生成部４４は、符号系列が互いに異なる接近検知用のＰＮ符号、及び、進出検知用のＰＮ符号を生成する。   The PN code generation unit 44 generates an approach detection PN code and an advance detection PN code having different code sequences.

ＳＳＢ変調部４６は、ＰＮ符号生成部４４によって生成された接近検知用のＰＮ符号、及び、進出検知用のＰＮ符号それぞれを用いて、搬送波生成部４２によって生成された搬送波をＳＳＢ変調して、接近検知信号ｆ１、及び、進出検知信号ｆ２を生成する。   The SSB modulation unit 46 performs SSB modulation on the carrier wave generated by the carrier wave generation unit 42 using the PN code for proximity detection generated by the PN code generation unit 44 and the PN code for advance detection, respectively. An approach detection signal f1 and an advance detection signal f2 are generated.

送信部４８は、ＳＳＢ変調部４６によって生成された検知信号を、適当な信号レベルに調整して一方のレールＲ１に出力する。すなわち、接近検知信号ｆ１を、絶縁継目３０の警報開始点Ｐ１側の送信点から一方のレールＲ１に送信し、進出検知信号ｆ２を、絶縁継目３０の警報終止点Ｐ２側の送信点から一方のレールＲ１に送信する。   The transmission unit 48 adjusts the detection signal generated by the SSB modulation unit 46 to an appropriate signal level and outputs it to one rail R1. That is, the approach detection signal f1 is transmitted from the transmission point on the alarm start point P1 side of the insulation joint 30 to one rail R1, and the advance detection signal f2 is transmitted from the transmission point on the alarm end point P2 side of the insulation joint 30 to one of the rails R1. Transmit to rail R1.

受信部５０は、他方のレールＲ２に流れている信号を受信する。   The receiving unit 50 receives a signal flowing in the other rail R2.

ＳＳＢ復調部５２は、受信部５０によって受信された信号を、搬送波生成部４２によって生成された搬送波を用いてＳＳＢ復調する。つまり、列車の車軸によるレール間の短絡によって検知信号が他方のレールＲ２に流れている場合、復調したデータ（受信データ）には、ＰＮ符号が含まれていることになる。   The SSB demodulator 52 demodulates the signal received by the receiver 50 using the carrier wave generated by the carrier wave generator 42. That is, when a detection signal flows through the other rail R2 due to a short circuit between the rails of the train axle, the demodulated data (received data) includes a PN code.

ＰＮ符号判定部５４は、ＳＳＢ復調部５２によって復調されたデータ（受信データ）と、ＰＮ符号生成部４４によって生成された接近検知用のＰＮ符号、及び、進出検知用のＰＮ符号それぞれとの相関演算を行うことで、受信データに含まれるＰＮ符号を判定する。すなわち、検知用のＰＮ符号を１ビットづつシフトしながら受信データとの相関演算を行い、相関値が所定値以上となる場合に、受信データに、その検知用のＰＮ符号が含まれると判定する。なお、ＳＳＢ復調部５２及びＰＮ符号判定部５４の組をチャンネルとして２チャンネル用意し、接近検知用のＰＮ符号に関する相関演算と、進出検知用のＰＮ符号に関する相関演算とを並列実行可能に構成してもよい。   The PN code determining unit 54 correlates the data (received data) demodulated by the SSB demodulating unit 52, the PN code for proximity detection generated by the PN code generating unit 44, and the PN code for advance detection. By calculating, the PN code included in the received data is determined. That is, a correlation operation with received data is performed while shifting the detection PN code bit by bit, and when the correlation value is equal to or greater than a predetermined value, it is determined that the detection data includes the detection PN code. . Two sets of SSB demodulator 52 and PN code determination unit 54 are prepared as channels, and the correlation calculation for the proximity detection PN code and the correlation calculation for the advance detection PN code can be executed in parallel. May be.

列車検知部５６は、ＰＮ符号判定部５４による判定結果をもとに、踏切道１０への列車の接近及び進出を判定し、判定結果を踏切警報制御装置２０へ出力する。すなわち、受信データに何れの検知用のＰＮ符号も含まれない場合には、列車無しを判定する。また、受信データに接近検知用のＰＮ符号が含まれる場合には、踏切道１０に列車が接近していると判定し、接近検知用のＰＮ符号が含まれず、且つ、進出検知用のＰＮ符号が含まれる場合には、踏切道１０から列車が進出したと判定する。   The train detection unit 56 determines the approach and advance of the train to the railroad crossing 10 based on the determination result by the PN code determination unit 54, and outputs the determination result to the railroad crossing warning control device 20. That is, when no received PN code is included in the received data, it is determined that there is no train. If the received data includes a PN code for approach detection, it is determined that the train is approaching the railroad crossing 10, and no PN code for proximity detection is included, and the PN code for advance detection Is included, it is determined that the train has advanced from the railroad crossing 10.

このように、本実施形態の踏切バックアップ装置４０は、点制御方式の踏切制御が行われる踏切道１０を対象とし、列車検知のバックアップとして用いられる。すなわち、軌道Ｒの一方のレールＲ１は、踏切道１０から警報終止点Ｐ２側の所定距離Ｌ２の位置に絶縁継目３０が設けられている。踏切バックアップ装置４０は、一方のレールＲ１の絶縁継目３０から警報開始点Ｐ１側に接近検知信号ｆ１を送信し、警報終止点Ｐ２側に進出検知信号ｆ２を送信する。そして、他方のレールＲ２からこれらの検知信号を受信することで、踏切道１０への列車の接近及び進出を判定する。つまり、踏切バックアップ装置４０は、踏切道１０への列車接近の検知と、踏切道１０からの列車進出の検知とを絶縁継目３０付近の１箇所で行うことができるため、従来のように警報開始点及び警報終止点それぞれに信号ケーブルを布設する必要がなくなり、大幅なコストの低減が実現可能となる。   Thus, the railroad crossing backup device 40 of the present embodiment is intended for the railroad crossing 10 where the point control type railroad crossing control is performed, and is used as a backup for train detection. That is, one rail R1 of the track R is provided with the insulation joint 30 at a predetermined distance L2 from the railroad crossing 10 to the alarm end point P2. The railroad crossing backup device 40 transmits an approach detection signal f1 from the insulation joint 30 of one rail R1 to the alarm start point P1 side and transmits an advance detection signal f2 to the alarm end point P2 side. And the approach and advance of the train to the railroad crossing 10 are determined by receiving these detection signals from the other rail R2. That is, since the railroad crossing backup device 40 can detect the approach of the train to the railroad crossing 10 and the detection of the train advancement from the railroad crossing 10 at one place near the insulating joint 30, the alarm start is started as in the conventional case. It is not necessary to lay signal cables at each of the points and the alarm end points, and a significant cost reduction can be realized.

また、接近検知信号ｆ１、及び、進出検知信号ｆ２は、搬送周波数ｆ０が２００Ｈｚ以下の低周波の搬送波を、互いに異なるＰＮ符号を用いてＳＳＢ変調（抑圧搬送波単側波帯変調）することで生成された信号である。これにより、最大４ｋｍ程度の長距離伝送且つ小電力伝送が可能であるとともに、両者を区別して受信することができる。   Further, the approach detection signal f1 and the advance detection signal f2 are generated by performing SSB modulation (suppressed carrier single sideband modulation) on a low-frequency carrier having a carrier frequency f0 of 200 Hz or less using different PN codes. Signal. Thereby, long distance transmission and low power transmission of about 4 km at the maximum are possible, and both can be received separately.

なお、本発明の適用可能な実施形態は上述の実施形態に限定されることなく、本発明の趣旨を逸脱しない範囲で適宜変更可能なのは勿論である。   It should be noted that embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can of course be changed as appropriate without departing from the spirit of the present invention.

（Ａ）検知信号の送信／受信レベル調整
踏切バックアップ装置４０の警報開始点は、車輪による短絡検知が可能な最大距離の地点となる。検知信号の送信レベル及び受信レベルの一方又は両方を調整することで、踏切バックアップ装置４０の警報開始点が、踏切の警報開始点Ｐ１より遠くならないようにすることができる。 (A) Transmission / Reception Level Adjustment of Detection Signal The alarm start point of the level crossing backup device 40 is the maximum distance at which a short circuit can be detected by wheels. By adjusting one or both of the transmission level and the reception level of the detection signal, the alarm start point of the level crossing backup device 40 can be prevented from being far from the alarm start point P1 of the level crossing.

１０ 踏切道
１２ 踏切警報機、１４ 踏切遮断機、１６，１８ 踏切制御子
２０ 踏切警報制御装置
３０ 絶縁継目
４０ 踏切バックアップ装置
４２ 搬送波生成部、４４ ＰＮ符号生成部、４６ ＳＳＢ変調部、４８ 送信部
５０ 受信部、５２ ＳＳＢ復調部、５４ ＰＮ符号判定部、５６ 列車検知部
Ｒ 軌道、Ｒ１，Ｒ２ レール
Ｐ１ 警報開始点、Ｐ２ 警報終止点 10 level crossing road 12 level crossing alarm, 14 level crossing breaker, 16, 18 level crossing controller 20 level crossing alarm control device 30 insulation joint 40 level crossing backup device 42 carrier generation unit, 44 PN code generation unit, 46 SSB modulation unit, 48 transmission unit 50 receiving unit, 52 SSB demodulating unit, 54 PN code determining unit, 56 train detecting unit R track, R1, R2 rail P1 alarm start point, P2 alarm end point

Claims (3)

点制御方式による踏切警報の警報開始点および警報終止点での列車検知をバックアップする踏切バックアップ装置であって、
踏切道から前記警報終止点側に所定距離離れた位置の一方レールのみに絶縁継目が設けられ、
前記絶縁継目を挟んで前記一方レールの前記踏切道側に接近検知信号を送信する接近検知用送信手段と、
前記絶縁継目を挟んで前記一方レールの前記踏切道と反対側に進出検知信号を送信する進出検知用送信手段と、
前記絶縁継目が設けられていない他方レールから前記接近検知信号を受信する接近検知用受信手段と、
前記他方レールから前記進出検知信号を受信する進出検知用受信手段と、
前記接近検知用受信手段による前記接近検知信号の受信状況に基づいて、前記踏切道への列車の接近を判定する接近判定手段と、
前記接近検知用受信手段による前記接近検知信号の受信状況、及び、前記進出検知用受信手段による進出検知信号の受信状況に基づいて、前記踏切道からの列車の進出を判定する進出判定手段と、
を備えた踏切バックアップ装置。 A railroad crossing backup device that backs up the train detection at the alarm start point and alarm end point of the railroad crossing alarm by the point control method,
An insulation seam is provided only on one rail at a predetermined distance from the railroad crossing to the warning end point side,
An approach detection transmitting means for transmitting an approach detection signal to the railroad crossing side of the one rail across the insulation seam;
An advancing detection transmitting means for transmitting an advancing detection signal to the side opposite to the railroad crossing of the one rail across the insulation seam;
An approach detection receiving means for receiving the approach detection signal from the other rail not provided with the insulation seam;
An advance detection receiving means for receiving the advance detection signal from the other rail;
Based on the reception status of the approach detection signal by the approach detection receiving means, an approach determination means for determining approach of the train to the railroad crossing,
Based on the reception status of the approach detection signal by the proximity detection receiving means and the reception status of the advance detection signal by the advance detection receiving means, an advance determination means for determining the advance of the train from the railroad crossing,
Crossing backup device equipped with. 前記接近検知用送信手段は、搬送周波数が２００Ｈｚ以下且つ５０Ｈｚ以上であり、第１の周期符号を送信する信号を前記接近検知信号として送信し、
前記進出検知用送信手段は、搬送周波数が２００Ｈｚ以下且つ５０Ｈｚ以上であり、前記第１の周期符号とは異なる第２の周期符号を送信する信号を前記進出検知信号として送信する、
請求項１に記載の踏切バックアップ装置。 The approach detection transmitting means transmits a signal for transmitting a first periodic code as the approach detection signal, with a carrier frequency of 200 Hz or less and 50 Hz or more,
The advancing detection transmitting means transmits a signal that transmits a second periodic code different from the first periodic code as the advancing detecting signal, with a carrier frequency of 200 Hz or lower and 50 Hz or higher.
The crossing backup device according to claim 1. 請求項１又は２に記載の踏切バックアップ装置と、
前記踏切道から前記警報終止点側に所定距離離れた位置の一方レールのみに設けた絶縁継目と、
を具備した踏切バックアップシステム。 A railroad crossing backup device according to claim 1 or 2,
An insulating seam provided only on one rail at a predetermined distance from the railroad crossing to the alarm end point;
Railroad crossing backup system equipped with.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03159869A (en) * 1989-11-17 1991-07-09 Mitsubishi Electric Corp Alarm control device for railroad crossing
JPH0891219A (en) * 1994-09-27 1996-04-09 Kyosan Electric Mfg Co Ltd Portable type track circuit device
JPH11278274A (en) * 1998-03-26 1999-10-12 Kyosan Electric Mfg Co Ltd Railroad crossing alarm device
JP2007223465A (en) * 2006-02-23 2007-09-06 Hokkaido Railway Co Train detection device and train detection system
JP2012096705A (en) * 2010-11-04 2012-05-24 Kyosan Electric Mfg Co Ltd Device for announcing start of railroad crossing alarm, and railroad crossing security device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03159869A (en) * 1989-11-17 1991-07-09 Mitsubishi Electric Corp Alarm control device for railroad crossing
JPH0891219A (en) * 1994-09-27 1996-04-09 Kyosan Electric Mfg Co Ltd Portable type track circuit device
JPH11278274A (en) * 1998-03-26 1999-10-12 Kyosan Electric Mfg Co Ltd Railroad crossing alarm device
JP2007223465A (en) * 2006-02-23 2007-09-06 Hokkaido Railway Co Train detection device and train detection system
JP2012096705A (en) * 2010-11-04 2012-05-24 Kyosan Electric Mfg Co Ltd Device for announcing start of railroad crossing alarm, and railroad crossing security device

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