JP2021125118A - Trolley wire theft monitoring system - Google Patents

Abstract

To suppress theft of a trolley wire at a lower cost.SOLUTION: A trolley wire theft monitoring system, having a plurality of trolley wires connected with each other and used in a railroad before practical use, includes a master device and one or more slave devices, including an acceleration sensor provided at a place at which vibration of the trolley wire can be detected. The slave device transmits measurement information showing a measurement result of the acceleration sensor or a content based on the measurement result to the master device.SELECTED DRAWING: Figure 5

Description

The present disclosure relates to a trolley line theft monitoring system.

A surveillance device that monitors an intruder into a surveillance area by photographing a predetermined surveillance area with a surveillance camera has been widely put into practical use. In such a monitoring device, an intruder into the monitoring area is generally monitored by displaying an image of the monitoring area taken by a surveillance camera on a monitor and the observer visually observing the displayed image. ..

For example, Japanese Patent Application Laid-Open No. 2012-109733 (Patent Document 1) discloses the following monitoring system. That is, the monitoring system includes a monitoring device and a display device, and the monitoring device includes a first photographing means for photographing a predetermined monitoring area and a photographed image captured by the first photographing means. When a moving object is included in the image, the moving object is automatically tracked and photographed, so that an enlarged image of the moving object is acquired and displayed on the display device by a second photographing means and an operator. A third image capable of acquiring an image of a desired portion in the monitoring area and displaying it on the display device independently of the first photographing means and the second photographing means by remote control. It has a photographing means.

Japanese Unexamined Patent Publication No. 2012-109733

G3-PLC Alliance, "Narrowband OFDM PLC specializations for G3-PLC networks", G3-PLC Alliance, October 2014

For example, in a railroad under construction, a trolley line to power a railroad car may be stolen. If the trolley wire is cut even a few meters at the end, it will be necessary to re-lay the entire trolley wire, which will cause great damage.

In addition, since railways usually take a yearly period from the start of construction to the start of operation of railway vehicles, there are many opportunities for the trolley line to be stolen.

Therefore, a method of deterring the theft of the trolley line by providing a surveillance system using a surveillance camera as described in Patent Document 1 can be considered.

However, in order to monitor all railway construction sites using surveillance cameras, many surveillance cameras are required and costly.

In addition, as another method for deterring theft, a method of applying a high voltage between the trolley line and the line even during the construction of the railway can be considered. However, even if this method is adopted, it is costly.

The present disclosure has been made to solve the above-mentioned problems, and an object thereof is to provide a trolley line theft monitoring system capable of deterring the theft of a trolley line at a lower cost.

(1) The trolley line theft monitoring system of the present disclosure is a trolley line theft monitoring system used in a railway before it is put into practical use in which a plurality of trolley lines are connected to each other, and is a parent device and the trolley line. The child device includes one or a plurality of child devices including an acceleration sensor provided in a place where the vibration of the device can be detected, and the child device provides the measurement result of the acceleration sensor or measurement information indicating the content based on the measurement result to the parent device. Send to.

(6) The trolley line theft monitoring system of the present disclosure is a trolley line theft monitoring system used for a railroad before it is put into practical use, in which a plurality of trolley lines are connected to each other, and among the plurality of trolley lines. The parent device connected to any one of the trolley wires is connected to the trolley wire to which the parent device is connected or a different trolley wire, and can communicate with the parent device via the trolley wire. Alternatively, the parent device includes a plurality of child devices, and the parent device detects an abnormality related to communication with the child device via the trolley wire.

The present disclosure can be realized not only as a trolley line theft monitoring system provided with such a characteristic processing unit, but also as a monitoring method in which the characteristic processing is a step, or the step is executed on a computer. It can be realized as a program to make it. Further, the present disclosure can be realized as a semiconductor integrated circuit that realizes a part or all of the trolley line theft monitoring system.

According to the present disclosure, theft of the trolley wire can be deterred at a lower cost.

FIG. 1 is a diagram conceptually showing a railway under construction in which a plurality of trolley lines are connected to each other and provided with the trolley line theft monitoring system according to the first embodiment of the present disclosure. FIG. 2 is a diagram showing a constructed section of a railway under construction according to the first embodiment of the present disclosure. FIG. 3 is a diagram showing in detail a part of the constructed section of the railway according to the first embodiment of the present disclosure. FIG. 4 is a diagram showing in detail a part of the constructed section of the railway according to the first embodiment of the present disclosure. FIG. 5 is a diagram showing an example of the configuration of the trolley line theft monitoring system according to the first embodiment of the present disclosure. FIG. 6 is a diagram showing an example of a configuration of a slave device in the tram line theft monitoring system according to the first embodiment of the present disclosure. FIG. 7 is a diagram showing an example of the configuration of the parent device in the trolley line theft monitoring system according to the first embodiment of the present disclosure. FIG. 8 is a diagram showing an example of an abnormality detection sequence in the trolley line theft monitoring system according to the first embodiment of the present disclosure. FIG. 9 is a diagram showing an example of an abnormality detection sequence in the trolley line theft monitoring system according to the first embodiment of the present disclosure. FIG. 10 is a diagram showing an example of an abnormality detection sequence in the trolley line theft monitoring system according to the first embodiment of the present disclosure. FIG. 11 is a diagram showing an example of an abnormality detection sequence in the trolley line theft monitoring system according to the first embodiment of the present disclosure. FIG. 12 is a diagram showing an example of the configuration of the trolley line theft monitoring system according to the second embodiment of the present disclosure. FIG. 13 is a diagram showing an example of the configuration of the trolley line theft monitoring system according to the second embodiment of the present disclosure. FIG. 14 is a diagram showing an example of a network topology in the trolley line theft monitoring system according to the second embodiment of the present disclosure. FIG. 15 is a diagram showing an example of a sequence when a slave device in the trolley line theft monitoring system according to the second embodiment of the present disclosure performs an entry process. FIG. 16 is a diagram showing an example of a configuration of a parent device in the trolley line theft monitoring system according to the second embodiment of the present disclosure. FIG. 17 is a diagram showing an example of communication state information in the trolley line theft monitoring system according to the second embodiment of the present disclosure. FIG. 18 is a diagram showing another example of communication state information in the trolley line theft monitoring system according to the second embodiment of the present disclosure. FIG. 19 is a diagram showing another example of communication state information in the trolley line theft monitoring system according to the second embodiment of the present disclosure. FIG. 20 is a diagram showing an example of an abnormality detection sequence in the trolley line theft monitoring system according to the second embodiment of the present disclosure.

First, the contents of the embodiments of the present disclosure will be listed and described.

(1) The trolley line theft monitoring system according to the embodiment of the present disclosure is a trolley line theft monitoring system used for a railroad before being put into practical use in which a plurality of trolley lines are connected to each other and is a master device. And one or more slave devices including an acceleration sensor provided at a place where the vibration of the trolley wire can be detected, and the slave device is a measurement result of the acceleration sensor or a measurement indicating a content based on the measurement result. Information is transmitted to the parent device.

With such a configuration, it becomes possible to more reliably and easily detect an abnormality related to the trolley line in the railway under construction. For example, even in a state before the theft, such as when the trolley wire is not completely cut, it is possible to catch an artificial phenomenon with respect to the trolley wire and detect an abnormality at an early stage. Further, for example, it is not necessary to install a system using a surveillance camera for monitoring theft. Therefore, theft of the trolley line can be deterred at a lower cost.

(2) Preferably, the child device determines an abnormality based on the measurement result of the acceleration sensor, and when it is determined that the abnormality has occurred, the abnormality information including the measurement result or the measurement value based on the measurement result. Is transmitted to the parent device as the measurement information, and the parent device determines an abnormality based on the abnormality information received from the child device.

In this way, the abnormality detection accuracy can be improved by the configuration in which the parent device secondarily determines the abnormality with respect to the abnormality determined in the child device.

(3) More preferably, the parent device comprehensively determines an abnormality based on the abnormality information received from the plurality of child devices.

With such a configuration, the parent device can comprehensively determine the abnormality after grasping the situation in the plurality of child devices, so that more diverse and accurate abnormality detection can be realized.

(4) Preferably, the parent device performs a process of notifying the theft of the trolley wire based on the measurement information received from the child device.

With such a configuration, for example, the administrator can easily grasp the situation where the trolley line is stolen, and can take appropriate measures such as reporting to the police.

(5) Preferably, the slave device determines an abnormality based on the measurement result of the acceleration sensor, and when it is determined that the abnormality has occurred, performs a predetermined warning process.

With such a configuration, it is possible to immediately warn the slave device in which the abnormality has occurred and more reliably prevent the theft of the trolley wire.

(6) The trolley line theft monitoring system according to the embodiment of the present disclosure is a trolley line theft monitoring system used for a railway before being put into practical use, in which a plurality of trolley lines are connected to each other. A parent device connected to the trolley wire of any one of the trolley wires of the above, and the parent device connected to the trolley wire to which the parent device is connected or a different trolley wire, and the parent device via the trolley wire. It includes one or more child devices capable of communicating, and the parent device detects an abnormality related to communication with the child device via the trolley wire.

In this way, the configuration that communicates using the trolley line in the railway under construction makes it possible to detect abnormalities related to the communication, and for example, it is not necessary to install a system using a surveillance camera to monitor theft. become. Therefore, theft of the trolley line can be deterred at a lower cost.

(7) Preferably, the parent device and the child device can communicate with each other via the other child device as a relay destination, and the parent device can further communicate with the child device via the relay destination and the trolley line. Detects abnormalities related to communication via.

With such a configuration, for example, the parent device can recognize whether or not communication is possible with the child device installed in a place where the parent device and the child device cannot directly transmit and receive communication signals, which is simple. More extensive monitoring can be done in the configuration.

(8) Preferably, the parent device and the child device are connected to a portion of the trolley line that is not scheduled to come into contact with a railroad vehicle.

With such a configuration, it is possible to monitor the theft of the trolley line without imposing a physical burden on the part of the trolley line that is expected to come into contact with the railroad vehicle. It can be prevented from affecting.

(9) Preferably, when the parent device detects an abnormality related to the communication, the parent device performs a process of notifying the theft of the trolley line.

With such a configuration, for example, the administrator can easily grasp the situation where the trolley line is stolen, and can take appropriate measures such as reporting to the police.

(10) Preferably, the child device can detect an abnormality related to the communication, and when it detects an abnormality, performs a predetermined warning process.

With such a configuration, it is possible to immediately warn the slave device in which the abnormality has occurred and more reliably prevent the theft of the trolley wire.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and the description thereof will not be repeated. In addition, at least a part of the embodiments described below may be arbitrarily combined.

<First Embodiment>
[Configuration and basic operation]
FIG. 1 is a diagram conceptually showing a railway under construction in which a plurality of trolley lines are connected to each other and provided with the trolley line theft monitoring system according to the first embodiment of the present disclosure.

With reference to FIG. 1, for example, in a country with a relatively large land area, when laying a railroad trolley line between points A and B several thousand kilometers apart, for example, laying work is performed in parallel at a plurality of locations. Will be done. In this case, a section in which the trolley line has been laid (hereinafter, also referred to as a constructed section) and a section in which the trolley line has not been laid (hereinafter, also referred to as an unconstructed section) will appear alternately.

FIG. 2 is a diagram showing a constructed section of a railway under construction according to the first embodiment of the present disclosure.

With reference to FIG. 2, a plurality of feeder substations 151 for applying a voltage between the trolley line and the line are provided in the constructed section. Each feeder substation 151 can apply a voltage between trolley lines and lines in a feeder section of, for example, 50 km.

The feeder substation 151 is provided, for example, in the center of the feeder section. That is, the range from the feeder substation 151 to the left and right 25 km is one feeder section.

3 and 4 are diagrams showing in detail a part of the constructed section of the railway according to the first embodiment of the present disclosure. FIG. 3 shows a state in which the constructed section is viewed from the horizontal direction. FIG. 4 shows a state in which the constructed section is viewed from above.

With reference to FIGS. 3 and 4, a plurality of trolley lines 10A, 10B, 10C, and 10D are provided above the line 20 laid on the ground in the constructed section. In FIG. 4, the trolley wires 10A, 10B, and 10C are typically shown. Hereinafter, each of the trolley wires 10A, 10B, 10C, and 10D will also be referred to as a trolley wire 10.

The trolley wire 10 is, for example, a copper-tin alloy or pure copper cable having a diameter of 150 mm2 and a length of 1500 m.

Electric power is supplied from the substation 151 to the trolley wire 10 via a feeder 15 provided alongside the trolley wire 10 and a dropper 35. In FIG. 4, for ease of understanding, the feeder 15 and the dropper 35 are not described, and the electrical connection relationship of the trolley wire 10 is mainly shown.

Weights Wt for pulling the trolley wire 10 and the feeder 15 are provided at both ends of the trolley wire 10 and the feeder 15. The weight Wt is suspended along the pole 121. The trolley wire 10 and the feeder 15 are erected at a height of, for example, 5 m from the ground surface.

As shown in FIG. 4, both ends of the trolley wire 10 are arranged so as to come out of the track 20 when viewed from above.

Further, each trolley wire 10 is provided, for example, so that the portions 200 m at both ends are aligned with the portions 200 m at both ends of the adjacent trolley wires 10. Each trolley wire 10 is electrically connected to a jumper 30 having a size of 150 square mm, which is the same as that of the trolley wire 10, via a feeder 15 and a dropper 35 in a portion provided side by side with the other trolley wires 10.

More specifically, the portion 200 m from the first end of the trolley wire 10A shown in FIG. 4 is provided so as to be aligned with the portion 200 m from the second end of the trolley wire 10B. The trolley wire 10A and the trolley wire 10B are electrically connected by using a jumper 30A.

Further, the portion 200 m from the second end of the trolley wire 10A is provided so as to be aligned with the portion 200 m from the first end of the trolley wire 10C. The trolley wire 10A and the trolley wire 10C are electrically connected by using the jumper 30B.

Each trolley line 10 is in a non-energized state, that is, a state in which the substation 151 does not apply a voltage for traveling a railroad vehicle in a situation where the railroad is not put into practical use.

FIG. 5 is a diagram showing an example of the configuration of the trolley line theft monitoring system according to the first embodiment of the present disclosure. FIG. 5 shows a state in which the constructed section is viewed from above.

With reference to FIGS. 5 and 3, the trolley line theft monitoring system 301 includes a parent device 102 and a plurality of child devices 101. The slave device 101 includes an acceleration sensor 41.

The trolley line theft monitoring system 301 may be configured to include a plurality of parent devices 102. Further, the trolley line theft monitoring system 301 may be configured to include one child device 101. Further, the parent device 102 is not limited to the vicinity of the child device 101 as shown in FIG. 5, and may be installed at a position away from the child device 101 and the trolley wire 10.

The master device 102 is provided in the feeder substation 151, for example, and is driven by the electric power supplied from the feeder substation 151.

In the examples shown in FIGS. 5 and 3, the slave devices 101 are installed at both ends of the trolley wire 10, that is, near the pole 121, and are installed on the trolley wire 10 at intervals of, for example, 500 m along the extending direction of the trolley wire 10. Will be done. Four child devices 101 are installed on one trolley wire 10. The slave device 101 is driven by, for example, a battery.

The slave device 101 may be installed only at the end of the trolley wire 10, or may be installed only at a position other than the end. Further, the installation location of the slave device 101 may be different on different trolley wires 10. Further, the trolley line theft monitoring system 301 is not limited to a configuration in which a plurality of slave devices 101 are installed on one trolley wire 10, but also has a configuration in which one slave device 101 is installed on one trolley wire 10. May be good.

The acceleration sensor 41 in the slave device 101 is provided at a position where the vibration of the trolley wire 10 can be detected. As an example, a housing for accommodating the acceleration sensor 41 and the like of the slave device 101 is attached to the trolley wire 10. The acceleration sensor 41 may be independently attached to the trolley wire 10 or the like.

The child device 101 and the parent device 102 are, for example, devices having a wireless communication function. Further, the parent device 102 and the child device 101 can communicate with each other via another child device 101 as a relay destination. That is, the child device 101 has a function of relaying communication between the other child device 101 and the parent device 102.

The child device 101 and the parent device 102 have a function of transferring information, for example, by performing multi-hop communication. In this example, 50 hops are provided for each monitoring section in the range of 31.4 km. That is, each child device 101 and the parent device 102 transmit information by performing multi-hop wireless communication.

As used herein, "transfer" includes, for example, relaying information to a relay destination and transmitting information as a source of information to the relay destination.

Specifically, as a "transfer", the child device 101 transmits, for example, the information received from the other child device 101 to another child device 101 or a parent device 102 different from the other child device 101. In addition, the information created by itself is transmitted to another child device 101 or a parent device 102.

In the trolley line theft monitoring system 301, the case is not limited to the case where information is transferred between adjacent child devices 101, and there may be a case where a certain child device 101 is skipped and information is transferred.

For example, the child device 101 has a MAC (Media Access Control) address as an example of a device-specific identifier. The MAC address is set, for example, when the device is manufactured.

Further, for example, different identification information, for example, a short address is fixedly assigned to the parent device 102 and the plurality of child devices 101 for communication in the trolley line theft monitoring system 301.

Between the parent device 102 and the child device 101, and between the child device 101 and the child device 101, for example, wireless communication using a communication band of the 920 MHz band according to the communication standard of IEEE802.154 is performed.

The parent device 102 and the plurality of child devices 101 send and receive packets in which identification information is stored as a source address and a destination address, for example, a short address of the source device and a short address of the destination device, respectively.

FIG. 6 is a diagram showing an example of a configuration of a slave device in the tram line theft monitoring system according to the first embodiment of the present disclosure.

With reference to FIG. 6, the slave device 101 includes an acceleration sensor 41, a communication unit 42, a processing unit 43, a storage unit 44, and a battery 45. The processing unit 43 is realized by a processor such as a CPU (Central Processing Unit) or a DSP (Digital Signal Processing). The communication unit 42 is realized by, for example, a communication circuit such as a communication IC (Integrated Circuit). The storage unit 44 is, for example, a non-volatile memory.

The slave device 101 operates by supplying electric power from the battery 45. For example, the processing unit 43 always operates. Further, for example, the communication unit 42 is normally in a standby state, and is activated when information is received from the processing unit 43.

The child device 101 indicates, for example, the measurement result of the acceleration sensor 41 by itself or the content based on the measurement result, creates measurement information including its own MAC address, and transmits the created measurement information to the parent device 102.

In the slave device 101, the acceleration sensor 41 outputs the measured acceleration as a measurement result to the processing unit 43.

For example, the processing unit 43 determines an abnormality based on the measurement result of the acceleration sensor 41, and when it is determined that an abnormality has occurred, the communication unit 43 uses the measurement result or abnormality information indicating the content based on the measurement result as measurement information. Output to 42.

More specifically, the processing unit 43 compares the measured value of the acceleration received from the acceleration sensor 41 with a predetermined threshold value, and if the measured value is equal to or greater than the predetermined threshold value, determines that an abnormality has occurred. The abnormality information is created and output to the communication unit 42.

On the other hand, when the measured value is less than the predetermined threshold value, the processing unit 43 determines that no abnormality has occurred and does not create the abnormality information.

Here, as the content based on the above measurement result, the processing unit 43 may be configured to simply output the abnormality information indicating that an abnormality has occurred, or may be configured to output the abnormality information further indicating the corresponding measured value. It may be.

[Modification 1]
When it is determined that no abnormality has occurred, the processing unit 43 may be configured to output normal information indicating the corresponding measured value to the communication unit 42 as measurement information.

[Modification 2]
The processing unit 43 is not limited to the configuration for outputting the abnormal information or the normal information indicating the corresponding measured value, and may be configured to output the abnormal information or the normal information indicating the value based on the corresponding measured value.

Specifically, for example, each time the processing unit 43 receives the measurement result from the acceleration sensor 41, the measurement result is time-stamped and stored in the storage unit 44 to generate time-series data of the acceleration. Then, the processing unit 43 calculates the amplitude of the vibration of the trolley line 10 by performing calculations such as integration and averaging with respect to the acceleration stored in the storage unit 44, and also uses the time stamp in the time series data to calculate the trolley. The period of vibration of the line 10 is calculated. The processing unit 43 may calculate the amplitude and the period for each type of vibration, that is, the frequency. The processing unit 43 outputs abnormal information or normal information indicating the calculated value to the communication unit 42 as measurement information.

[Modification 3]
The processing unit 43 may be configured to output the measurement result of the acceleration sensor 41 or the measurement information indicating the content based on the measurement result to the communication unit 42 without determining an abnormality based on the measurement result of the acceleration sensor 41. ..

[Modification example 4]
The processing unit 43 may be configured to determine an abnormality based on the measurement result of the acceleration sensor 41, and when it is determined that an abnormality has occurred, perform a predetermined warning process.

More specifically, when it is determined that an abnormality has occurred as described above, the slave device 101 emits a sound, light, or the like to give a warning.

In the standby state, the communication unit 42 is activated when receiving measurement information from the processing unit 43 as described above, transmits the received measurement information to the parent device 102, and after transmission, transitions to the standby state again.

More specifically, the communication unit 42 stores the short addresses of its own child device 101 and parent device 102 as the source address and the destination address, respectively, in the header, and the measurement information received from the processing unit 43 is stored in the payload. The packet is generated, and a radio signal in the 920 MHz band including the generated packet is transmitted.

Further, the communication unit 42 receives the 920 MHz band radio signal transmitted from the other child device 101, acquires the packet included in the received wireless signal, and the destination address of the acquired packet is the short address of the parent device 102. If, a 920 MHz band radio signal including the packet is transmitted.

The child device 101 is not limited to the configuration in which the short address of the parent device 102 is set as the destination address, and the short address of the child device 101 on the upstream side, which is the parent device 102 side when viewed from its own child device 101, or the parent device 101. The configuration may be such that the short address of the device 102 is set. In this case, for example, when the destination address of the packet received from the other child device 101 is the short address of its own child device 101, the child device 101 sets the destination address of the packet as the next hop destination on the upstream side. It changes to the short address of the child device 101 or the parent device 102, changes the source address to the short address of its own child device 101, and transmits a radio signal including the changed packet.

Further, the communication between the parent device 102 and the child device 101 is not limited to wireless communication, and may be configured to be performed by power line communication via the trolley line 10 as in the second embodiment described later.

FIG. 7 is a diagram showing an example of the configuration of the parent device in the trolley line theft monitoring system according to the first embodiment of the present disclosure.

With reference to FIG. 7, the parent device 102 includes a communication unit 21, a processing unit 22, and a storage unit 23. The processing unit 22 is realized by a processor such as a CPU or DSP. The communication unit 21 is realized by, for example, a communication circuit such as a communication IC. The storage unit 23 is, for example, a non-volatile memory.

The communication unit 21 receives, for example, a 920 MHz band radio signal transmitted from the child device 101, acquires a packet included in the received wireless signal, and the destination address of the acquired packet is the short address of its own parent device 102. If, the measurement information included in the packet is output to the processing unit 22.

When the processing unit 22 receives the abnormality information from the communication unit 21, the processing unit 22 recognizes that the child device 101 having the MAC address included in the abnormality information has detected the abnormality. As an example, the processing unit 22 determines that an abnormality related to the trolley line 10 has occurred when it receives the abnormality information from the communication unit 21.

Then, as notification processing, the processing unit 22 displays, for example, the MAC address and the measured value included in the abnormality information from the child device 101 on a display device (not shown).

For example, an administrator in charge of railway maintenance or the like confirms the installation location of one or a plurality of child devices 101 having the displayed one or a plurality of MAC addresses, respectively, and identifies the location as a location where an abnormality has occurred.

Further, for example, by comparing the magnitudes of vibrations in each child device 101, the administrator causes damage such as cutting of the trolley wire 10 at a place closer to the child device 101 in which the vibration having a large amplitude occurs. It can be determined that the damage has occurred in the middle of the two adjacent child devices 101 in which the amplitude of the same magnitude is generated.

The processing unit 22 is not limited to the configuration for performing notification processing regarding the abnormality of the trolley wire 10, and is configured to record a log, for example, to store the measured value indicated by the abnormality information, the reception time of the abnormality information, and the like in the storage unit 23. It may be.

[Modification 5]
When the processing unit 22 receives the abnormality information from the communication unit 21, it determines the abnormality again based on the abnormality information, and when it determines that the abnormality has occurred, displays on the display device as described above. It may be a configuration.

Specifically, for example, the processing unit 22 refers to the period of vibration indicated by the abnormality information, and when, for example, the period is less than a predetermined threshold value, the vibration is artificial and the corresponding child device 101 can be used. It is determined that an abnormality has occurred in the trolley wire 10 at a nearby location.

Alternatively, for example, the processing unit 22 refers to the amplitude and period of the vibration indicated by the abnormality information, and when the amplitude is less than the predetermined threshold value and the period is equal to or more than the predetermined threshold value, the vibration is due to a natural phenomenon such as wind. Yes, it is judged that no abnormality has occurred.

[Modification 6]
The processing unit 22 may be configured to comprehensively determine the abnormality based on the abnormality information received from the plurality of child devices 101. Further, the processing unit 22 may be configured to comprehensively determine the abnormality based on the normal information received from the other child device 101 in addition to the abnormality information. Further, the source of the plurality of measurement information subject to the comprehensive judgment may be the child device 101 installed on the same trolley line 10 or the child device 101 installed on different trolley lines 10. You may.

Specifically, for example, when the processing unit 22 generates vibrations having the same amplitude and period in the plurality of child devices 101 and the period is equal to or more than a predetermined threshold value, the vibrations are caused by a natural phenomenon such as wind. Therefore, it is judged that no abnormality has occurred.

Alternatively, for example, the processing unit 22 causes vibration of a particularly large amplitude in one child device 101 or the plurality of child devices 101 arranged on the common trolley wire 10 among the plurality of child devices 101 that have transmitted the abnormality information. If it occurs, it is determined that the vibration is artificial and that an abnormality has occurred in the trolley wire 10 at the position of the corresponding child device 101.

Alternatively, for example, the processing unit 22 transmits abnormality information from one child device 101 or a plurality of child devices 101 arranged on the common trolley line 10 among the plurality of child devices 101 that have transmitted measurement information. When normal information is transmitted from another child device 101, it is determined that the vibration is artificial and that an abnormality has occurred in the trolley wire 10 at the position of the corresponding child device 101.

[Modification 7]
Based on the measurement information received from the communication unit 21, the processing unit 22 receives the abnormality information from the communication unit 21 as described above, or analyzes the abnormality information or the like. The trolley wire 10 may be recognized as the theft as the above abnormality, and the trolley wire may be notified to a management device (not shown) by displaying that the trolley wire is stolen or transmitting an e-mail as a notification process.

[Operation flow]
Each device in the trolley line theft monitoring system 301 includes a computer including a memory, and an arithmetic processing unit such as a CPU in the computer executes a program including a part or all of each step of the following sequence or flowchart from the memory. Read and execute. The programs of these plurality of devices can be installed from the outside. The programs of these plurality of devices are distributed in a state of being stored in a recording medium.

Each of the following sequences illustrates the operation of one master device 102 and child devices 101A, 101B, 101C, 101D in the trolley line theft monitoring system 301.

FIG. 8 is a diagram showing an example of an abnormality detection sequence in the trolley line theft monitoring system according to the first embodiment of the present disclosure.

With reference to FIG. 8, first, the slave devices 101A, 101B, 101C, and 101D acquire the measurement results of their own acceleration sensor 41 (steps S1 to S4).

Next, the slave devices 101A, 101B, and 101D determine that no abnormality has occurred based on the corresponding measurement results (steps S5 to S7). Further, the child device 101C determines that an abnormality has occurred based on the corresponding measurement result (step S8).

Next, the child device 101C performs a predetermined warning process (step S9), creates abnormality information, and transmits the abnormality information to the parent device 102 via the child devices 101B and 101A (step S10).

Next, the parent device 102 receives the abnormality information from the child device 101C, and based on the abnormality information, or when the abnormality information is received, the parent device 102 displays the MAC address or the like included in the abnormality information, or the trolley. A notification process such as notifying the theft of the line 10 is performed (step S11).

FIG. 9 is a diagram showing an example of an abnormality detection sequence in the trolley line theft monitoring system according to the first embodiment of the present disclosure.

With reference to FIG. 9, first, among the child devices 101A, 101B, 101C, and 101D, the child device 101C acquires the measurement result of its own acceleration sensor 41 (step S11).

Next, the child device 101C creates measurement information and transmits it to the parent device 102 via the child devices 101B and 101A without determining an abnormality (step S12).

Next, the parent device 102 receives the measurement information from the child device 101C, and determines whether or not an abnormality has occurred based on the measurement information (step S13).

When the parent device 102 determines that an abnormality has occurred (YES in step S14), the parent device 102 performs notification processing (step S15).

On the other hand, when it is determined that no abnormality has occurred (NO in step S14), the parent device 102 does not perform the notification process.

FIG. 10 is a diagram showing an example of an abnormality detection sequence in the trolley line theft monitoring system according to the first embodiment of the present disclosure.

With reference to FIG. 10, first, the slave devices 101A, 101B, 101C, and 101D acquire the measurement results of their own acceleration sensor 41 (steps S21 to S24).

Next, the child devices 101A, 101B, 101C, and 101D determine that an abnormality has occurred based on the corresponding measurement results (steps S25 to S28).

Next, the child devices 101A, 101B, 101C, and 101D perform predetermined warning processing (steps S29 to S32) and create abnormality information, which are directly via the child devices 101A and 101B, 101A, respectively. And the abnormality information is transmitted to the parent device 102 via the child devices 101C, 101B, 101A (steps S33 to S36).

Next, the parent device 102 receives the abnormality information from the child devices 101A, 101B, 101C, and 101D, and comprehensively determines the abnormality based on each received abnormality information (step S37).

When the parent device 102 determines that an abnormality has occurred (YES in step S38), the parent device 102 performs notification processing (step S39).

On the other hand, when it is determined that no abnormality has occurred (NO in step S38), the parent device 102 does not perform the notification process.

FIG. 11 is a diagram showing an example of an abnormality detection sequence in the trolley line theft monitoring system according to the first embodiment of the present disclosure.

With reference to FIG. 11, first, the slave devices 101A, 101B, 101C, and 101D acquire the measurement results of their own acceleration sensor 41 (steps S41 to S44).

Next, the child devices 101A and 101B determine that an abnormality has occurred based on the corresponding measurement results (steps S45 and S46). Further, the slave devices 101C and 101D determine that no abnormality has occurred based on the corresponding measurement results (steps S47 and S48).

Next, the child devices 101A and 101B perform predetermined warning processing (steps S49 and S50), create abnormality information, and transmit the abnormality information directly and via the child device 101A to the parent device 102 (steps S51 and S50, respectively). S52).

Further, the child devices 101C and 101D create normal information and transmit it to the parent device 102 via the child devices 101B and 101A and the child devices 101C, 101B and 101A, respectively (steps S53 and S54).

Next, the parent device 102 receives the abnormality information from the child devices 101A and 101B and the normal information from the child devices 101C and 101D, and comprehensively determines the abnormality based on the received measurement information (step S55). ).

When the parent device 102 determines that an abnormality has occurred (YES in step S56), the parent device 102 performs notification processing (step S57).

On the other hand, when it is determined that no abnormality has occurred (NO in step S56), the parent device 102 does not perform the notification process.

By the way, in order to monitor all railway construction sites using surveillance cameras, many surveillance cameras are required and costly. In addition, as another method for deterring theft, a method of applying a high voltage between the trolley line and the line even during the construction of the railway can be considered. However, even if this method is adopted, it is costly.

On the other hand, in the trolley wire theft monitoring system according to the first embodiment of the present disclosure, one or more slave devices 101 include an acceleration sensor 41 provided at a place where vibration of the trolley wire 10 can be detected. .. The child device 101 transmits the measurement result of the acceleration sensor 41 or the measurement information indicating the content based on the measurement result to the parent device 102.

With such a configuration, it becomes possible to more reliably and easily detect an abnormality related to the trolley line 10 in the railway under construction. For example, even in a state before the theft, such as when the trolley wire 10 is not completely cut, it is possible to catch an artificial phenomenon with respect to the trolley wire 10 and detect an abnormality at an early stage. Further, for example, it is not necessary to install a system using a surveillance camera for monitoring theft.

Therefore, in the trolley line theft monitoring system according to the first embodiment of the present disclosure, the theft of the trolley line can be deterred at a lower cost.

Next, other embodiments of the present disclosure will be described with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and the description thereof will not be repeated.

<Second Embodiment>
The present embodiment relates to a trolley line theft monitoring system that detects an abnormality related to communication via a trolley line as compared with the trolley line theft monitoring system according to the first embodiment. Except for the contents described below, the system is the same as the trolley line theft monitoring system according to the first embodiment.

FIG. 12 is a diagram showing an example of the configuration of the trolley line theft monitoring system according to the second embodiment of the present disclosure. The trolley line theft monitoring system 302 is provided, for example, in the constructed section shown in FIG. FIG. 12 shows a state in which the constructed section shown in FIG. 4 is viewed from the horizontal direction.

FIG. 13 is a diagram showing an example of the configuration of the trolley line theft monitoring system according to the second embodiment of the present disclosure. FIG. 13 shows a state in which the trolley line theft monitoring system 302 shown in FIG. 12 is viewed from above.

With reference to FIGS. 12 and 13, the trolley wire theft monitoring system 302 includes a parent device 112 and child devices 111A, 111B, 111C which are three child devices 111.

The trolley line theft monitoring system 302 may be configured to include a plurality of parent devices 112. Further, the trolley line theft monitoring system 302 may be configured to include one, two, or four or more child devices 111.

The master device 112 is provided in, for example, a feeder substation 151, and is connected to a line 20 and a trolley line 10A. The master device 112 is driven by, for example, the electric power supplied from the feeder substation 151.

The child device 111A is connected to the line 20 and the trolley wire 10A to which the parent device 112 is connected. The child device 111B and the child device 111C are connected to the line 20, the trolley wire 10B, and the trolley wire 10C, respectively. The slave device 111 is driven by, for example, a battery.

For example, the parent device 112 and the child device 111 are connected to a portion of the trolley wire 10 on the end side where contact with a railroad vehicle is not planned.

More specifically, the parent device 112 is connected, for example, between the portion 10AR near the second end of the trolley wire 10A and the line 20.

The slave device 111A is connected, for example, between the portion 10AL near the first end of the trolley wire 10A and the line 20.

The slave device 111B is connected, for example, between the portion 10BL near the first end of the trolley wire 10B and the line 20.

The slave device 111C is connected, for example, between the portion 10CR near the second end of the trolley wire 10C and the line 20.

The slave devices 111A, 111B, 111C can communicate with the parent device 112 via the trolley wire 10.

Communication between the parent device 112 and the child device 111 is described in, for example, G3-PLC Alliance, "Narrowband OFDM PLC specializations for G3-PLC networks", G3-PLC Alliance, October 2014 (Non-Patent Document 1). It is performed by power line communication via the trolley line 10 according to the PLC standard.

More specifically, the parent device 112 and the child device 111 use the trolley line 10 and the line 20 as communication paths to transmit and receive communication signals according to the G3-PLC standard.

The child device 111 has a MAC address as an example of a device-specific identifier. The MAC address is set, for example, when the device is manufactured.

Specifically, the child devices 111A, 111B, 111C and the parent device 112 have, for example, MAC addresses of MAC-A, MAC-B, MAC-C, and MAC-Z, respectively.

[Network Topology]
FIG. 14 is a diagram showing an example of a network topology in the trolley line theft monitoring system according to the second embodiment of the present disclosure.

With reference to FIG. 14, the parent device 112 and the child device 111 have, for example, a PAN_ID (Personal Area Network Identification).

In the trolley line theft monitoring system 302, when a plurality of parent devices 112 are present, each parent device 112 has a different PAN_ID.

The parent device 112 manages, for example, one or a plurality of child devices 111, and exchanges authentication information, various information, and the like with the managed child device 111.

The child device 111 establishes a communication connection with the parent device 112 which is a transmission destination of various information. Specifically, the child device 111A and the child device 111C establish a communication connection with, for example, the parent device 112 when they are not under the control of the parent device 112.

In this case, the child device 111A and the child device 111C directly exchange, for example, authentication information and various information with the parent device 112.

Further, for example, the parent device 112 and the child device 111B can communicate with each other via the child device 111A. That is, the child device 111 has a function of relaying communication between the other child device 111 and the parent device 112. The communication between the child devices 111 is performed by the power line communication via the trolley line 10 in accordance with the G3-PLC standard described in Non-Patent Document 1, similarly to the communication between the parent device 112 and the child device 111. The communication between the parent device 112 and the child device 111 and the communication between the child devices 111 may be different types of communication from the power line communication.

More specifically, the child device 111 may transmit various information directly to the parent device 112 without going through the other child device 111, and the child device 111 may send various information via one or more other child devices 111. May be transmitted to the parent device 112.

Specifically, when the child device 111B is not under the control of the parent device 112, the child device 111B establishes a communication connection with the parent device 112 via the child device 111A.

In this case, the child device 111B exchanges authentication information, various information, and the like with the parent device 112 via the child device 111A.

That is, the child device 111A serves as a hop destination for relaying information exchanged between the parent device 112 and the child device 111B. The child device 111B may establish a communication connection with the parent device 112 without going through the child device 111A.

The PAN_ID of the parent device 112 and the child devices 111A, 111B, 111C under the control of the parent device 112 is, for example, "0001".

The parent device 112 and the child devices 111A, 111B, 111C form a PA (Personal Area) network NWA.

That is, it is possible to determine which PA network the parent device 112 and the child device 111 are connected to by communication based on the PAN_ID.

[Operation flow]
Each device in the trolley line theft monitoring system 302 includes a computer including a memory, and an arithmetic processing unit such as a CPU in the computer executes a program including a part or all of each step of the following sequence or flowchart from the memory. Read and execute. The programs of these plurality of devices can be installed from the outside. The programs of these plurality of devices are distributed in a state of being stored in a recording medium.

FIG. 15 is a diagram showing an example of a sequence when a slave device in the trolley line theft monitoring system according to the second embodiment of the present disclosure performs an entry process.

With reference to FIG. 15, when the parent device 112 has already constructed the PA network, for example, it is assumed that the power of the child device 111A is turned on and the operation is started.

First, the child device 111A broadcasts a beacon request to search for the parent device 112 (step S101).

Next, when the parent device 112 receives the beacon request from the child device 111A, the parent device 112 creates a beacon BA as a response to the received beacon request, and transmits the created beacon BA to the child device 111A (step S102).

Next, the child device 111A receives the beacon BA from the parent device 112 and performs an entry process for starting communication with the parent device 112 which is a transmission destination of various information (step S103).

More specifically, the child device 111A transmits, for example, a connection request including its own MAC address and the PAN_ID of the parent device 112, specifically Joining, to the parent device 112.

When the parent device 112 receives the connection request from the child device 111A, the parent device 112 performs a content confirmation process of the received connection request. When the parent device 112 confirms that the PAN_ID included in the connection request and its own PAN_ID match, it determines that the child device 111A is managed.

Then, authentication information is exchanged between the child device 111A and the parent device 112 using the MAC address included in the connection request, and the parent device 112 authenticates the child device 111A.

As a result, a direct communication connection is established between the child device 111A and the parent device 112.

Further, the child device 111B and the child device 111C establish a communication connection with the parent device 112 by performing the same operation as the child device 111A.

The parent device 112 detects an abnormality related to communication with the child device 111 via the trolley wire 10.

FIG. 16 is a diagram showing an example of a configuration of a parent device in the trolley line theft monitoring system according to the second embodiment of the present disclosure.

With reference to FIG. 16, the parent device 112 includes a communication unit 61, a processing unit 62, and a storage unit 63. The processing unit 62 is realized by a processor such as a CPU or DSP. The communication unit 61 is realized by, for example, a communication circuit such as a communication IC. The storage unit 63 is, for example, a non-volatile memory.

The communication unit 61 includes the information created by the processing unit 62 in the communication signal and transmits the information to each slave device 111 via the trolley line 10. Further, the communication unit 61 receives the communication signal transmitted from each child device 111 via the trolley line 10.

The processing unit 62 creates, for example, various types of information, and transmits the created information to each child device 111 via the communication unit 61.

More specifically, the processing unit 62 in the parent device 112 periodically or irregularly creates a confirmation request for confirming that communication with the child device 111 is possible, and outputs the confirmation request to the communication unit 61.

The communication unit 61 transmits, for example, a communication signal including a confirmation request received from the processing unit 62 to each slave device 111 via the trolley line 10.

The communication unit 61 transmits, for example, a communication signal including a confirmation request received from the processing unit 62 to the slave device 111A via the trolley line 10A.

Further, the communication unit 61 transmits, for example, a communication signal including a confirmation request received from the processing unit 62 to the slave device 111B via the trolley line 10A, the jumper 30A, and the trolley line 10B.

Further, the communication unit 61 transmits, for example, a communication signal including a confirmation request received from the processing unit 62 to the slave device 111C via the trolley line 10A, the jumper 30B, and the trolley line 10C.

The communication unit 61 is configured to unicast a communication signal including a confirmation request to each child device 111, but the present invention is not limited to this. The communication unit 61 may be configured to broadcast a communication signal including a confirmation request to each child device 111, for example.

Each child device 111 receives the communication signal transmitted from the parent device 112 via the trolley line 10, and includes the response to the confirmation request included in the received communication signal and the confirmation response including its own MAC address in the communication signal. Then, the signal is transmitted to the master device 112 via the trolley wire 10.

Specifically, the child device 111A receives the communication signal transmitted from the parent device 112 via the trolley line 10A, responds to the confirmation request included in the received communication signal, and confirms including the MAC address of MAC-A. The response is included in the communication signal and transmitted to the master device 112 via the trolley line 10A.

Further, the child device 111B receives the communication signal transmitted from the parent device 112 via the trolley line 10A, the jumper 30A and the trolley line 10B, and responds to the confirmation request included in the received communication signal and the MAC of MAC-B. The acknowledgment including the address is included in the communication signal and transmitted to the parent device 112 via the trolley line 10B, the jumper 30A and the trolley line 10A.

Further, the child device 111C receives the communication signal transmitted from the parent device 112 via the trolley line 10A, the jumper 30B and the trolley line 10C, includes the confirmation response included in the received communication signal in the communication signal, and includes the trolley. The signal is transmitted to the master device 112 via the wire 10C, the jumper 30B, and the trolley wire 10A.

The child device 111 may transmit a communication signal including a confirmation request transmitted from the parent device 112 to another child device 111. That is, the child device 111 relays the communication signal including the confirmation request transmitted from the parent device 112 to the other child device 111.

Specifically, the child device 111A receives a communication signal including a confirmation request transmitted from the parent device 112 via the trolley line 10A, and receives the received communication signal via the trolley line 10A, the jumper 30A, and the trolley line 10B. It is transmitted to the child device 111B.

Further, the child device 111 may transmit a communication signal including an acknowledgment transmitted from another child device 111 to the parent device 112. That is, the child device 111 relays the communication signal including the confirmation response transmitted from the other child device 111 to the parent device 112.

Specifically, the child device 111A receives, for example, a communication signal including the confirmation response transmitted from the child device 111B via the trolley line 10B, the jumper 30A, and the trolley line 10A, and the communication signal including the received confirmation response. Is transmitted to the master device 112 via the trolley wire 10A.

The communication unit 61 in the parent device 112 receives the communication signal including the confirmation response transmitted from each child device 111 via the trolley line 10, acquires the confirmation response and the MAC address included in the received communication signal, and processes them. Output to unit 62.

The processing unit 62 receives the confirmation response and the MAC address from the communication unit 61, and confirms that the child device 111 having the MAC address can communicate.

Then, the processing unit 62 creates or updates the communication status information including the MAC address and stores it in the storage unit 63.

FIG. 17 is a diagram showing an example of communication state information in the trolley line theft monitoring system according to the second embodiment of the present disclosure.

With reference to FIG. 17, the communication status information indicates the MAC address of the child device 111 for which the confirmation response has been confirmed.

The communication state information shown in FIG. 17 indicates a state in which the parent device 112 has received confirmation responses from the child device 111A, the child device 111B, and the child device 111C.

Further, the processing unit 62 displays, for example, communication status information on a display device (not shown).

As a result, the administrator can confirm the child device 111 capable of communicating. For example, when the communication status information including the MAC addresses of all the child devices 111 installed in a certain construction section is displayed on the display device, the administrator can recognize that there is no abnormality in the trolley line. ..

With reference to FIG. 12 again, as an example, when the trolley wire 10B is cut between the connection point of the trolley wire 10B with the slave device 111B and the jumper 30A, between the parent device 112 and the child device 111B, and between the child device 111A and the child device 111A and Communication is not possible between the slave devices 111B.

More specifically, the child device 111B does not transmit the confirmation response to the parent device 112 because the communication signal including the confirmation request transmitted from the parent device 112 cannot be received.

Then, the parent device 112 cannot confirm the confirmation response from the child device 111B.

For example, the processing unit 62 in the parent device 112 cannot receive the confirmation response from the child device 111B even after a predetermined time has elapsed since the confirmation request was transmitted to the child device 111B via the communication unit 61. Therefore, the processing unit 62 creates communication state information that does not include the MAC address of the child device 111B in the communication state information, or deletes and updates the MAC address of the child device 111B from the communication state information in the storage unit 63. ..

Then, for example, as a notification process, the processing unit 62 displays the created communication status information or the updated communication status information on a display device (not shown).

FIG. 18 is a diagram showing another example of communication state information in the trolley line theft monitoring system according to the second embodiment of the present disclosure.

With reference to FIG. 18, when the parent device 112 cannot confirm the confirmation response from the child device 111B, the communication status information does not include MAC-B, which is the MAC address of the child device 111B.

For example, the administrator confirms the displayed communication status information, and has the MAC address because the MAC address of some of the child devices 111 installed in a certain construction section is not included in the communication status information. The abnormality of the trolley wire 10 corresponding to the slave device 111 can be recognized.

With reference to FIG. 12 again, as another example, when the trolley wire 10A is cut between the jumper 30A and the jumper 30B in the trolley wire 10A, between the master device 112 and the child device 111A, and between the parent device 112 and the child device 111B. Communication becomes impossible between them.

More specifically, the child device 111A and the child device 111B do not transmit the confirmation response to the parent device 112 because the communication signal including the confirmation request transmitted from the parent device 112 cannot be received.

Then, the parent device 112 cannot confirm the confirmation response from the child device 111A and the child device 111B.

For example, the processing unit 62 in the parent device 112 cannot receive the confirmation response from the child device 111A and the child device 111B even after a predetermined time has elapsed since the confirmation request was transmitted to the child device 111B via the communication unit 61. .. Therefore, the processing unit 62 creates communication state information that does not include the MAC addresses of the child devices 111A and 111B in the communication state information, or the MAC addresses of the child devices 111A and 111B from the communication state information in the storage unit 63. Delete and update.

Then, for example, as a notification process, the processing unit 62 displays the created communication status information or the updated communication status information on a display device (not shown).

FIG. 19 is a diagram showing another example of communication state information in the trolley line theft monitoring system according to the second embodiment of the present disclosure.

With reference to FIG. 19, when the parent device 112 cannot confirm the confirmation response from the child device 111A and the child device 111B, the communication status information includes the MAC address of the child device 111A and the child device 111B. -A and MAC-B are not included.

The child device 111 may be able to detect an abnormality related to communication with the parent device 112 via the trolley wire 10. When the slave device 111 detects an abnormality related to communication, the slave device 111 performs a predetermined warning process.

More specifically, the child device 111 relates to a state in which, for example, the reception of the confirmation request from the parent device 112 cannot be confirmed even after a predetermined time has elapsed since the previous confirmation request from the parent device 112 was received. Detects it as an abnormality and performs predetermined warning processing such as issuing a warning sound.

FIG. 20 is a diagram showing an example of an abnormality detection sequence in the trolley line theft monitoring system according to the second embodiment of the present disclosure. FIG. 20 illustrates the operation of one master device 112 and the child devices 111A, 111B, 111C in the trolley wire theft monitoring system 302. Further, FIG. 20 shows an example in which the parent device 112 unicasts the confirmation request to each child device 111.

With reference to FIG. 20, first, the parent device 112 transmits a communication signal including a confirmation request to the child device 111A via the trolley line 10A (step S301).

Next, the child device 111A receives the communication signal including the confirmation request transmitted from the parent device 112, and sends a communication signal including a response to the confirmation request included in the received communication signal and a confirmation response including its own MAC address. (Step S302).

Further, the parent device 112 transmits a communication signal including a confirmation request to the child device 111B. More specifically, the parent device 112 transmits a communication signal including a confirmation request to the child device 111A via the trolley line 10A. The child device 111A receives the communication signal including the confirmation request transmitted from the parent device 112, and transmits the received communication signal to the child device 111B via the trolley wire 10A, the jumper 30A, and the trolley wire 10B (step S303). ).

Next, the child device 111B receives the communication signal including the confirmation request transmitted from the child device 111A, and sends a communication signal including a response to the confirmation request included in the received communication signal and a confirmation response including its own MAC address. Is included in the above and transmitted to the parent device 112.

More specifically, the child device 111B transmits the communication signal to the child device 111A via the trolley line 10B, the jumper 30A and the trolley line 10A. The child device 111A receives the communication signal including the confirmation response transmitted from the child device 111B, and transmits the received communication signal to the parent device 112 via the trolley line 10A (step S304).

Further, the parent device 112 transmits a communication signal including a confirmation request to the child device 111C via the trolley line 10A, the jumper 30B, and the trolley line 10C (step S305).

Next, the child device 111C receives the communication signal including the confirmation request transmitted from the parent device 112, and acquires the confirmation request included in the received communication signal. Then, the child device 111C includes the response to the acquired confirmation request and the confirmation response including its own MAC address in the communication signal, and transmits the confirmation response to the parent device 112 via the trolley line 10C (step S306).

Next, the parent device 112 acquires an acknowledgment included in each communication signal received from the child devices 111A, 111B, 111C (step S307).

Next, the parent device 112 creates or updates the communication status information based on each MAC address included in each acquired acknowledgment (step S308).

Next, the parent device 112 displays the created or updated communication status information on the display device (step S309).

Here, it is assumed that the trolley wire 10A is cut between the jumper 30A and the jumper 30B in the trolley wire 10A shown in FIG.

Next, the parent device 112 transmits the communication signal including the confirmation request to the child devices 111A and 111B, respectively (steps S310 and S311).

However, since the trolley wire 10A is disconnected, the child device 111A cannot receive the communication signal including the confirmation request transmitted from the parent device 112. (Step S313).

Further, since the trolley wire 10A is disconnected, the child device 111B cannot receive the communication signal including the confirmation request transmitted from the parent device 112 via the child device 111A. (Step S314).

Further, the parent device 112 transmits a communication signal including a confirmation request to the child device 111C via the trolley line 10A, the jumper 30B, and the trolley line 10C (step S312).

Next, the child device 111C receives the communication signal including the confirmation request transmitted from the parent device 112, and acquires the confirmation request included in the received communication signal. Then, the child device 111C includes the response to the acquired confirmation request and the confirmation response including its own MAC address in the communication signal, and transmits the confirmation response to the parent device 112 via the trolley line 10C (step S315).

Next, the parent device 112 acquires an acknowledgment included in the communication signal received from the child device 111C (step S316).

Next, the parent device 112 updates the communication status information to the contents including MAC-C included in the acquired acknowledgment and not including MAC-A and MAC-B (step S317).

Next, the parent device 112 displays the updated communication status information on the display device as a notification process (step S318).

Next, the parent device 112 performs a process of notifying the theft of the trolley line 10A and the trolley line 10B as a notification process. (Step S319).

Step S301 and step S302, step S303 and step S304, and step S305 and step S306 are not limited to the above, and the order may be changed or may be performed in parallel.

In the trolley line theft monitoring system according to the second embodiment of the present disclosure, the parent device 112 and the child device 111 are located on the end side of the trolley line 10 and are not scheduled to come into contact with a railroad vehicle. Although it is assumed that the configuration is connected, the configuration is not limited to this. The parent device 112 and the child device 111 may be configured to be connected to a portion of the trolley line 10 where contact with a railroad vehicle is planned.

Further, in the trolley line theft monitoring system according to the second embodiment of the present disclosure, when the parent device 112 detects an abnormality related to communication, the parent device 112 is configured to perform a process of notifying the theft of the trolley line 10 as a notification process. Yes, but it is not limited to this. When an abnormality related to communication is detected, the parent device 112 may be configured to record a log, for example, to store information including a time when the abnormality is detected in the storage unit 63.

Further, in the trolley line theft monitoring system according to the second embodiment of the present disclosure, the slave device 111 is configured to perform a predetermined warning process when an abnormality related to communication is detected, but the present invention is limited to this. It's not a thing. When the child device 111 detects an abnormality related to communication, the child device 111 may be configured to perform a process of notifying the parent device 112 that the abnormality has been detected.

Further, in the trolley line theft monitoring system according to the second embodiment of the present disclosure, the parent device 112 is in a state where it cannot communicate with the child device 111, and more specifically, a child for a confirmation request transmitted to the child device 111. The configuration is such that the reception of the confirmation response from the device 111 cannot be confirmed even once as an abnormality related to communication, but the present invention is not limited to this. The parent device 112 may have a configuration in which a state in which reception of a part of each confirmation response corresponding to the confirmation request transmitted a plurality of times cannot be confirmed is regarded as an abnormality related to communication.

Further, in the trolley line theft monitoring system according to the second embodiment of the present disclosure, the parent device 112 and the child device 111 are configured to be connected between the trolley line 10 and the line 20, but the present invention is limited to this. It's not something to do. The parent device 112 and the child device 111 may be connected between the trolley line 10 and the ground, for example, and may transmit and receive a communication signal using the trolley line 10 and the ground as a communication path, for example.

Thereby, for example, even when the trolley wire 10 has been laid and the line 20 has not been laid, the master device 112 can detect an abnormality related to communication with the child device 111 via the trolley wire 10. ..

Further, in the trolley line theft monitoring system according to the second embodiment of the present disclosure, the parent device 112 and the child device 111 are configured to be connected between the trolley line 10 and the line 20, but the present invention is limited to this. It's not something to do. The parent device 112 and the child device 111 may be connected between the trolley lines 10 laid corresponding to each line 20 in a double-track railway, for example. In this case, the parent device 112 and the child device 111 transmit and receive communication signals using each of the trolley lines 10 as a communication path.

As described above, in the trolley wire theft monitoring system according to the second embodiment of the present disclosure, one or more child devices 111 are connected via the trolley wire 10 to which the parent device 112 is connected or a different trolley wire 10. It can communicate with the parent device 112. The parent device 112 detects an abnormality related to communication with the child device 111 via the trolley wire 10.

In this way, the configuration in which communication is performed using the trolley line 10 in the railway under construction makes it possible to detect an abnormality related to the communication, for example, installation of a system using a surveillance camera for monitoring theft. It becomes unnecessary.

Therefore, the trolley line theft monitoring system according to the second embodiment of the present disclosure can prevent the theft of the trolley line at a lower cost.

Since other configurations and operations are the same as those of the trolley line theft monitoring system according to the first embodiment, detailed description will not be repeated here.

The trolley line theft monitoring system according to the second embodiment of the present disclosure does not need to be provided with the acceleration sensor 41 as compared with the trolley line theft monitoring system according to the first embodiment.

On the other hand, the trolley wire theft monitoring system according to the first embodiment of the present disclosure has a trolley such that the end of the trolley wire 10 is cut as compared with the trolley wire theft monitoring system according to the second embodiment. Even in a situation where communication between the master device and the child device is not interrupted even if the wire 10 is disconnected, an abnormality related to the trolley wire 10 can be detected.

It should be considered that the above embodiments are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

The above description includes the features described below.
[Appendix 1]
A trolley line theft monitoring system used for railways before it is put into practical use, in which multiple trolley lines are connected to each other.
With the parent device
It comprises one or more slave devices including an accelerometer provided at a location where the vibration of the trolley wire can be detected.
The child device transmits the measurement result of the acceleration sensor or the measurement information indicating the content based on the measurement result to the parent device.
The plurality of child devices and the parent device transmit the measurement information by performing multi-hop wireless communication using a communication band of the 920 MHz band.
A trolley line theft monitoring system in which a voltage for traveling a railroad vehicle is not applied to each of the trolley lines.

[Appendix 2]
A trolley line theft monitoring system used for railways before it is put into practical use, in which multiple trolley lines are connected to each other.
A parent device connected to the trolley wire of any one of the plurality of trolley wires,
It comprises one or more child devices connected to the trolley wire to which the parent device is connected or different trolley lines and capable of communicating with the parent device via the trolley wire.
The parent device detects an abnormality related to communication with the child device via the trolley wire, and detects an abnormality.
The parent device and the child device perform power line communication via the trolley line, and perform power line communication.
A trolley line theft monitoring system in which a voltage for traveling a railroad vehicle is not applied to each of the trolley lines.

10, 10A, 10B, 10C, 10D Trolley line 15 Feeder 20 Line 21 Communication unit 22 Processing unit 23 Storage unit 30, 30A, 30B Jumper 35 Dropper 41 Accelerometer 42 Communication unit 43 Processing unit 44 Storage unit 45 Battery 61 Communication unit 62 Processing unit 63 Storage unit 101, 101A, 101B, 101C, 101D, 111, 111A, 111B, 111C Child device 102, 112 Master device 121 Pole 151 Electric substation 301, 302 Tram line theft monitoring system Wt Weight

Claims (10)

A trolley line theft monitoring system used for railways before it is put into practical use, in which multiple trolley lines are connected to each other.
With the parent device
It comprises one or more slave devices including an accelerometer provided at a location where the vibration of the trolley wire can be detected.
The child device is a trolley line theft monitoring system that transmits the measurement result of the acceleration sensor or measurement information indicating the content based on the measurement result to the parent device. The child device determines an abnormality based on the measurement result of the acceleration sensor, and when it is determined that the abnormality has occurred, the child device uses the measurement result or abnormality information including a measurement value based on the measurement result as the measurement information. Send to the parent device
The trolley line theft monitoring system according to claim 1, wherein the parent device determines an abnormality based on the abnormality information received from the child device. The trolley line theft monitoring system according to claim 2, wherein the parent device comprehensively determines an abnormality based on the abnormality information received from the plurality of child devices. The trolley line theft monitoring system according to any one of claims 1 to 3, wherein the parent device performs a process of notifying the theft of the trolley line based on the measurement information received from the child device. .. The child device determines an abnormality based on the measurement result of the acceleration sensor, and when it is determined that the abnormality has occurred, performs a predetermined warning process, according to any one of claims 1 to 4. Trolley line theft monitoring system. A trolley line theft monitoring system used for railways before it is put into practical use, in which multiple trolley lines are connected to each other.
A parent device connected to the trolley wire of any one of the plurality of trolley wires,
It comprises one or more child devices connected to the trolley wire to which the parent device is connected or different trolley lines and capable of communicating with the parent device via the trolley wire.
The parent device is a trolley line theft monitoring system that detects an abnormality related to communication with the child device via the trolley line. The parent device and the child device can communicate with each other as a relay destination via the other child device.
The trolley line theft monitoring system according to claim 6, wherein the parent device further detects an abnormality related to communication with the child device via the relay destination and the trolley line. The trolley line theft monitoring system according to claim 6 or 7, wherein the parent device and the child device are connected to a portion of the trolley line that is not scheduled to come into contact with a railroad vehicle. The trolley line theft monitoring system according to any one of claims 6 to 8, wherein the parent device performs a process of notifying the theft of the trolley line when an abnormality related to the communication is detected. The trolley line theft monitoring system according to any one of claims 6 to 9, wherein the child device can detect an abnormality related to the communication, and if detected, performs a predetermined warning process.

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