JP4163047B2 - Maintenance support system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a maintenance support system.
[0002]
[Prior art]
In the field of railway transportation, along with the higher performance of vehicles, higher speed of transportation, higher density, and enlarging transportation systems, the maintenance workers along the railway line will make more complicated work situations and decisions in addition to the original maintenance work. There is a tendency to increase the opportunity to encounter. However, the actual situation is that most of the work protection along the railway is entrusted to human train monitoring.
[0003]
Maintenance work is usually done by closing the track or waiting time, and some passenger companies are actively introducing their own protection systems. However, most of the other methods are handled by work manuals and safety guidance, and as a result, accident prevention that relies on human attention is the mainstream.
[0004]
Many human errors have been reported as the cause of accidents associated with maintenance work, such as unconfirmed train schedule on the day of work, misidentification of the train that started the work, delay in the instruction to look out at the train, and delay in the evacuation of workers. The causes of these accidents are caused by human error, forgetfulness, and misjudgment.
[0005]
By the way, the maintenance work performed under work control starts from grasping the status of train operation such as temporary trains and car number changes at a meeting on the day of work, and shifts to work start. And, during work, the work is kept safe by monitoring train arrivals and passages by train guards. Particularly important in this process is the recognition of the work starting train, and after passing the train, the passing train until the end of the work is sequentially monitored by the guard diamond.
[0006]
However, as a disadvantage of this monitoring method, there is a danger that human errors such as misunderstanding of trains due to assumptions, delays in changing attention, and diamond misrecognition due to sudden disruption of operation may lead to accidents such as delays in evacuation of workers or vehicle contact. There is a problem of working in a difficult environment.
[0007]
In addition, the watch schedule is the most important information for prediction of evacuation if the train is on time, but once the train operation is disturbed, there is a risk that the information will be incorrect. Therefore, in order to ensure safe work, it is necessary to have a mechanism that always knows the latest train diagram and can predict danger in real time at the work site. However, it has been impossible to find a prior art document disclosing a technique related to the present invention, such as providing information useful for preventing human error to the maintenance work site. For this reason, prior art documents are not described.
[0008]
[Problems to be solved by the invention]
An object of the present invention is to provide a maintenance support system that prevents human error during maintenance work.
[0009]
[Means for Solving the Problems]
In order to solve the above problem, the invention according to claim 1
A maintenance support server that communicates with the CTC center and collects TID information, a portable terminal that has a wireless telephone function, and is arranged along the railway line at a predetermined interval, and performs wired communication with the maintenance support server and wireless communication with the portable terminal A maintenance support system configured to include a plurality of control terminal stations, and a wired line connecting the maintenance support server and the control terminal station,
The wired communication is a first transmission method in which a predetermined transmission frame is transmitted so as to circulate in a certain direction on a communication link formed between the maintenance support server and the control terminal station connected by the wired line. And
The transmission frame includes TID information and , Special information consisting of voice information and control information , A storage area for storing
The voice information is voice information for calling between the mobile terminals,
The control information includes a work number generated by the mobile terminal, a worker name, Work type Including work pre-work start information, information for giving approval of work start generated by the maintenance support server, and notification information for notifying work pre-work start train and train delay in units of work points,
The portable terminal is
Transmitting means for transmitting the pre-work start information to the maintenance support server via the control terminal station;
Receiving means for receiving the notification information from the maintenance support server via the control terminal station,
The maintenance support server
TID updating means for updating the TID information stored in the transmission frame transmitted by the first transmission method to the content of the TID information collected by the maintenance support server, and transmitting the TID information to the control terminal station;
First special information updating means for taking out the control information from the special information stored in the transmission frame and transmitting the control information to the control terminal station as new control information for each control terminal station,
Each control terminal is
The maintenance support server or Upstream When the transmission frame is received from the control terminal station, the TID information stored in the received transmission frame and the special information addressed to the local station are extracted and transmitted to the mobile terminal, and the special frame received from the mobile terminal Information to the maintenance support server and downstream Generating the special information to be conveyed to the control terminal station, updating the special information stored in the transmission frame with the generated special information, or the maintenance support server or downstream The second special information updating means for transmitting to the control terminal station is provided.
[0014]
According to the first aspect of the present invention, the TID information collected by the maintenance support server is obtained by circulating a predetermined transmission frame on a communication link formed between the maintenance support server and the control terminal station. , Special information consisting of voice information and control information , Is transmitted to the control terminal station, is transmitted to the mobile terminal via this control terminal station, information from the mobile terminal is transmitted to the control terminal station, and is further transmitted to the other mobile terminal via the other control terminal station. Sent. Also, with TID information , Special information consisting of voice information and control information , Is stored in one transmission frame, so TID information and , Voice information and control information , It is possible to realize wired communication capable of handling and transmitting two different types of information such as special information consisting of the same. Therefore, it is possible to realize a maintenance support system that prevents human error during maintenance work.
[0017]
Claims 2 As in the invention described in claim 1 In the maintenance support system described in
Adjacent control terminal stations may perform the wireless communication at different carrier frequencies.
[0018]
This claim 2 According to the invention described in claim 1 As described above, the mobile terminal can control the source from the carrier frequency transmitted from the control terminal station by performing wireless communication at a different carrier frequency between adjacent control terminal stations. The terminal station can be identified. Therefore, it is possible to prevent interference that occurs between adjacent control terminal stations.
[0019]
Further claims 3 As in the invention described in claim 1, Or 2 In the maintenance support system described in
Wireless communication between the control terminal station and the mobile terminal is Consisting of the control information It may be a second transmission method in which data information and audio information are integrated.
[0020]
This claim 3 According to the invention described in claim 1, Or 2 The same effect as the invention described in (2), and two types of information with different required transmission quality, that is, data information that is required to be reliably transmitted and a minimum transmission delay are required. Wireless communication integrated with voice information.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, a case where the maintenance support system of the present invention is applied to a CTC section maintenance support system will be described. This CTC section maintenance support system is a system for supporting maintenance work using CTC information.
[0022]
1. Utilization and transmission method of CTC information
1.1 Utilization of CTC information
In the CTC center, operation status information (hereinafter referred to as “TID” information) indicating the train number and the position of the train line is generated. This TID information is information that corresponds to a train diagram that allows the train number and its position to be known in real time at the work site, and is the most suitable information for this system.
[0023]
1.2 Information transmission method
A method for transmitting the TID information stored in the CTC center to the work site along the line will be described. Including the cost reduction associated with the introduction of new equipment, it is desirable to use radio as the transmission method, but there are many factors that obstruct radio in mountainous areas, tunnels, bridges, etc. along railway lines, and include measures to improve these On the other hand, the cost may increase. Moreover, although the measure by the expansion of the conventional communication cable can be considered, it is thought that the cost will increase.
[0024]
On the other hand, from the viewpoint of the worker, a transmission method that can deliver information with stable quality and can follow the mobility at the work site is desired. For these reasons, between the CTC center and the railway line, the information necessary for this system is created by integrating the information of the existing communication lines. A composite communication method that combines wired communication and wireless communication is possible.
[0025]
2. Overview of maintenance support system for CTC section
In order to prevent human errors that are likely to be committed by maintenance workers, watchmen, etc. can be established by building a mechanism that provides TID information equivalent to the latest train diagrams in the line area in real time and assisting train monitoring operations. There is a need for a support method that can immediately determine risk prediction.
[0026]
In addition, assuming a situation where the CTC-related equipment stops or cannot provide accurate information, a mechanism that can simultaneously use a telephone along the railway (hereinafter referred to as a “line telephone”) will be provided. The reason for having a telephone line along the line is to make it easier to avoid danger by avoiding original judgments in the event of an unexpected situation and using communication to easily collect appropriate information.
[0027]
A schematic configuration of the CTC section maintenance support system in the present embodiment is shown in FIG. As shown in the figure, the maintenance support system for the CTC section is maintained by the maintenance support server 100 for collecting the TID information of the CTC center, the station transmission apparatus 200, the control terminal station 300, and the operator that are on-site equipment. Mobile terminal 400 and alarm device 500, and a railway multimedia / mobile access communication network, which is an infrastructure technology of this system. The outline of each device will be described below.
[0028]
2.1 Maintenance support server
2.1.1 Collection and distribution of operation status information
The maintenance support server 100 collects TID information by connecting to a line to which the TID central apparatus 600 and the TID terminal apparatus are connected. The communication speed of the TID information can be selected from either 1200 b / s or 2400 b / s. The collected TID information is distributed at a communication speed of 156 Kb / s toward the control terminal station 300 along the line every time it is received. In addition, the maintenance support server 100 includes an interface that can exchange voice information with a railway telephone exchange (hereinafter referred to as “telephone exchange”) 700 as necessary.
[0029]
2.1.2 Work management
The maintenance support server 100, from a portable terminal 400 possessed by an operator described later, immediately before starting the operation, the operation number, the operator name, the operation type (line closing, waiting time, etc.), the operation start / end time, the use of the maintenance vehicle Etc. and the acceptance of the information is given to give approval to start work to the portable terminal 400. This input is a condition that activates the following functions.
[0030]
2.1.3 Train link management
In the work management registration, the maintenance support server 100 recognizes that the work is performed at any location on the main line, and the train approaching the work location unit is extracted based on the TID information. Train link management extracts the train (work start train) immediately before starting work in units of work points by upper and lower lines, and performs delay management of passing trains during work hours. The delay itself uses the driving time recorded at the time station.
[0031]
The maintenance support server 100 transmits to the portable terminal 400 the work start train and the train delay for each work location ascertained by the train link management, and transmits them to the mobile terminal 400 as notification information, thereby transmitting it to the watchman and the work manager at the work site. At the work site, the operation status corresponding to the latest train schedule can be grasped in real time by the transmitted notification information and TID information, and the work start train can be identified and the train delay can be grasped.
[0032]
These support effects can prevent worker's belief, delay in changing attention, misidentification of information, and the like, and enable new work protection by improving risk prediction. In the following, it will be expressed as TID information including notification information such as a work start train and train delay information.
[0033]
2.2 Control terminal
The control terminal station 300 is arranged along the line at intervals of about 500 m in accordance with the wireless output. In addition, the control terminal 300 collects and distributes TID information sent from the maintenance support server 100, voice information from the telephone exchange 700, line closing control from the mobile terminal 400, and various types of information such as a maintenance vehicle approach notification. This is a composite transmission apparatus that can use wired communication and wireless communication simultaneously, and includes a wired unit 310 that handles wired communication and a wireless unit 320 that handles wireless communication.
[0034]
2.2.1 Control terminal transmission / reception
The wired unit 310 transmits the TID information from the maintenance support server 100 to the wireless unit 320 every time it is received. Then, the wireless unit 320 transmits the TID information from the wired unit 310 to the mobile terminal 400 using a cyclic broadcast method (continuous transmission). By this transmission method, the worker who owns the portable terminal 400 can receive TID information freely and in real time as long as it is within the railway line. The control terminal station 300 transmits the received information to the maintenance support server 100 via the wired unit 310 when a line phone call or line closing control is sent from the mobile terminal 400 described later.
[0035]
2.2.2 Notification of approaching vehicle for maintenance
The approach of the maintenance vehicle is transmitted by mounting the portable terminal 400 on the maintenance vehicle and sending an approach notification from the portable terminal 400 to the control terminal station 300. When receiving the approach notification, the control terminal station 300 transmits the received approach notification to the maintenance support server 100, and the control terminal station 300 instructed by the maintenance vehicle management of the maintenance support server 100 approaches toward the line. Send notifications.
[0036]
2.3 Mobile terminal
The portable terminal 400 is a man-machine unit that connects a railway operator and the system, and has the following two modes.
[0037]
2.3.1 Worker mode
The worker mode is a mode in which the worker can grasp the latest operation status based on the TID information sent from the maintenance support server 100, and can perform a telephone line and line closing control.
[0038]
When the TID information is received, the portable terminal 400 displays the row number and the line position in the middle of the two stations 3 and simultaneously displays in a display format in which the work start train and the delay time are watched. Moreover, the portable terminal 400 uses the display window number of TID, and when the train is on the display window closest to the work site, the portable terminal 400 notifies the user of an approaching bell.
[0039]
The telephone along the line can be dialed from the screen interface and connected to the telephone exchange 700 via the control terminal 300 to make a call. TID information can be displayed even during a call.
[0040]
Further, the line closing control is transmitted to the maintenance support server 100 via the control terminal station 300, and the control completion response or display information is transmitted to the portable terminal 400 via the control terminal station 300, thereby completing the control.
[0041]
2.3.2 Maintenance vehicle mode
The maintenance vehicle mode is a mode in which the portable terminal 400 is mounted on the maintenance vehicle and a maintenance vehicle approach notification is output to the control terminal station 300, and is positioned as a function to save labor for relay watchmen. Also, an alarm device 500 is provided that only notifies the train approaching to workers who are away from the relay watchmen as in group work.
[0042]
3. Wired and wireless combined communication system
An outline of the network of the combined wired and wireless communication system, which becomes the infrastructure technology of the present system, that promptly treats each function described above will be described.
[0043]
This network is characterized by ensuring the same communication quality as wired communication by combining wired communication and wireless communication, being able to follow the mobility at the work place, and freely exchanging information. In addition, in order to create a wired line necessary for this system, it has an information capturing function for integrating the line information, and a method for integrating the TID information and the voice information of the line telephone is used.
[0044]
The integration of voice information requires a transmission process that requires high-speed and continuous voice information in terms of the nature and technical aspects of this system. This is to ensure
[0045]
A communication specification that satisfies these conditions can be expected to build a new information transmission system along the railway line in the future. The following is a description of each item and its outline.
[0046]
3.1 High-speed network using metallic lines
This is a network connecting the CTC center and the railway line. The data capacity of the communication line used in the past has been 9.6 Kb / s as a standard, but it cannot be said that the capacity of information is sufficient. Therefore, in this embodiment, a baseband transmission device having a capacity of 156 Kb / s is employed. FIG. 2 shows the specifications of wired communication.
[0047]
The baseband method has a drawback that it cannot secure a long transmission distance, but it is suitable for a transmission line having a wide band from DC to high frequency, and a digital signal can be directly put on the transmission line, which is advantageous in terms of cost. Therefore, it is adopted in this system.
[0048]
Further, a bipolar code is used as the transmission code. The bipolar code has a characteristic that it can perform balanced transmission that is resistant to noise because a reverse potential appears alternately between two signals having different polarities, so that the DC component is reduced and the code is less susceptible to the low-frequency cutoff of the transmission line.
[0049]
3.2 Wireless communication
A network connecting the control terminal 300 and the portable terminal 400, and a radio frequency in the 40 MHz band, which has been used abundantly, was selected. In addition, frequency utilization efficiency and interference prevention were achieved by a zone identification method using a subcarrier frequency. FIG. 3 shows the specifications of the wireless communication.
[0050]
3.2.1 Wireless system
FIG. 4 shows a wireless system of the control terminal station 300, the mobile terminal 400 (including the maintenance vehicle installed), and the alarm device 500 arranged along the railway. In the figure, for convenience, the transmission frequency from the control terminal station 300 is f1 (429.50 MHz), the transmission frequency from the portable terminal 400 is f2 (429.90 MHz), and two waves as a maintenance vehicle approach notification are respectively f3 ( Downlink: 429.30 MHz) and f4 (uplink: 429.30 MHz).
[0051]
F1 transmitted from the control terminal 300 is TID information sent from the CTC center, voice information via the railway telephone exchange 700, control response such as line closing, and approach notification (upper / lower) information from the maintenance vehicle. Is transmitted as packetized message information of 9.6 b / s. Since f1 is always transmitted, the maintenance contractor can always receive TID information during maintenance work including patrol and the like, and can also use a telephone along the line at the same time. F2 transmitted from the portable terminal 400 outputs voice information of the line telephone and control information such as line closing, and information that needs to be acted upon reception of f1.
[0052]
3.2.2 Interference prevention zone identification
The control terminal stations 300 are arranged every 500 m, and when the above-described radio frequency is used in each control terminal station 300, there is a possibility that interference occurs between the adjacent control terminal stations 300. Therefore, each control terminal station 300 is provided with three zones in which the unique subcarrier frequency shown in FIG. 5 is assigned to the control terminal station 300 to prevent interference.
[0053]
The portable terminal 400 discriminates the subcarrier frequency transmitted from the control terminal station 300 and performs automatic zone identification. In addition, when the mobile terminal 400 moves near the zone boundary due to work movement or the like, both radio waves are received. Therefore, a zone automatic switching method for receiving the service of the control terminal station 300 having the largest electric field is adopted. .
[0054]
3.3 Integration of TID information and telephone along the line
In the configuration in which the TID information and the line telephone can be used at the same time, the use efficiency of the communication line and the cost reduction can be achieved by integrating the data information and the voice information. However, these two types of information are completely different and different information in the handling apparatus.
[0055]
That is, data information is information that is required to be transmitted correctly on a computer network, and the quality of data transmission is ensured by retransmission processing or the like. Voice information, on the other hand, is information in which transmission delay directly affects call quality. of If the retransmission process is performed as described above, a delay occurs in the conversation.
[0056]
For this reason, this system employs cyclic broadcast transmission control (transmission control) in order to establish transmission of these two kinds of different information. In particular, the voice is ITU'sG. The target is a voice delay guideline of 150 to 400 ms / one or less, which is a 144 recommended value. Note that the voice is transmitted after being compressed to 2 kb / s by a voice coding vocoder chip based on IMBE.
[0057]
As described above, between the CTC center and the railway line, by the wired communication of the specifications shown in FIG. 2, voice information 3CH and line closing control represented by TID information, information by integration for generating the line of this system, In addition, information transmission can be performed by wireless communication of the specifications shown in FIG.
[0058]
3.4 Cyclic broadcast
An outline of a cyclic broadcast protocol applied to wired communication and wireless communication will be described. This protocol is a technique for performing continuous communication, and is a protocol that has the advantage of absorbing dissimilar information and absorbing quality differences between wired communication and wireless communication.
[0059]
3.4.1 Maintenance support server and control terminal
An outline of transmission between the maintenance support server 100 and the control terminal station 300 is shown in FIG. As shown in the figure, one packet of 7.8 Kb / s is continuously transmitted for each upstream and downstream at intervals of 50 ms. Here, “upstream” means a direction of information transmission from the control terminal station 300 to the maintenance support server 100, and “downstream” means information transmission from the maintenance support server 100 to each control terminal station 300. Means direction.
[0060]
A physical configuration of a wired communication network between the maintenance support server 100 and the control terminal station 300 is shown in FIG. In the figure, a case is shown in which one maintenance support server 100 and two control terminal stations 300 (hereinafter referred to as “control terminal stations 300-1 and 300-2”) are provided. As shown in the figure, the wired communication network connects the maintenance support server 100 and the control terminal station 300 in a ring shape to form a communication link. Then, information transmission between the maintenance support server 100 and the control terminal station 300 is performed by one transmission frame FL circulating (transmitting) in one direction at a constant period on the communication link.
[0061]
More specifically, the transmission terminal 100a of the maintenance support server 100 and the reception terminal 300b-1 of the control terminal station 300-1 are connected, and the transmission terminal 300a-1 of the control terminal station 300-1 and the control terminal station 300-2 are connected. The receiving terminal 300b-2 of the control terminal station 300-2 is connected to the receiving terminal 100b of the maintenance support server 100. Each device (maintenance support server 100 and control terminal station 300-1, 2) sends a transmission frame FL to the next device every 50 ms. Therefore, the transmission frame FL is transmitted from the maintenance support server 100 to the control terminal station 300-. The data is transmitted in the order of 1 → control terminal station 300-2.
[0062]
An outline of the format of the transmission frame FL that circulates on the wired communication network is shown in FIG. As shown in the figure, the format of the transmission frame FL is a fixed format including a TID data portion 10, an audio data portion 20, and a control data portion 30.
[0063]
The TID data unit 10 stores TID information generated by the maintenance support server 100 and transmitted to each control terminal station 300.
[0064]
The voice data unit 20 stores voice information that accompanies the use of a telephone line. More specifically, the voice data portion 20a for voice information transmitted from the maintenance support server 100 to the control terminal station 300-1, and the voice information voice data transmitted from the maintenance support server 100 to the control terminal station 300-2. A data section 20b, a voice data section 20c for voice information transmitted from the control terminal station 300-1 to the maintenance support server 100, and a voice information section transmitted from the control terminal station 300-1 to the control terminal station 300-2. Voice data part 20d, voice data part 20e for voice information transmitted from the control terminal station 300-2 to the maintenance support server 100, and voice transmitted from the control terminal station 300-2 to the control terminal station 300-1. And an audio data section 20f for information. Each of the audio data sections 20a to 20f digitally outputs analog audio for a predetermined time (for example, 50 ms) at a predetermined sampling rate. Audio information is stored.
[0065]
In addition, the control data unit 30 stores control information for communication between the maintenance support server 100 and each control terminal station 300. More specifically, the control data control data unit 30a transmitted from the maintenance support server 100 to the control terminal station 300-1, and the control for control information transmitted from the maintenance support server 100 to the control terminal station 300-2. A control unit for control information transmitted from the control terminal station 300-2 to the maintenance support server 100 and a control data unit 30c for control information transmitted from the control terminal station 300-1 to the maintenance support server 100 A data portion 30d.
[0066]
FIG. 9 shows a functional configuration of the wired communication unit 910 provided in the maintenance support server 100 and the wired unit 310 of the control terminal station 300. As shown in the figure, the wired communication unit 910 includes a transmission processing unit 911 and a transmission / reception buffer 912 that temporarily holds transmission / reception data for one frame.
[0067]
At the time of data reception, the transmission processing unit 911 converts the received transmission code for one frame into a digital code, writes it as reception data in the transmission / reception buffer 912, extracts data addressed to the own device from the reception data, and performs a central control Output to 920. Then, a transmission frame FL is generated by updating a part of the received data written in the transmission / reception buffer 912 and sent to the next apparatus.
[0068]
Specifically, for example, in the case of the control terminal station 300-1, from the received transmission frame FL, TID information stored in the TID data unit 10, audio information stored in the audio data units 20a and 20f, and a control data unit The control information stored in 30a is extracted, and the extracted audio information is output to the wireless unit 320. Then, in the received transmission frame FL, the audio information stored in the audio data units 20c and 20d is received by the radio unit 320 and updated to new digitized audio information, and stored in the control data unit 30c. By updating the control information to new control information for the maintenance support server 100, a transmission frame FL for transmission is generated and transmitted to the control terminal station 300-2.
[0069]
In the case of the maintenance support server 100, the voice information stored in the voice data sections 20c and 20e and the control information stored in the control data sections 30c and 30d are extracted from the received transmission frame FL, and the extracted voice information is telephoned. Transmit to switch 700. Then, in the received transmission frame FL, the TID information stored in the TID data unit 10 is updated to new TID information collected from the TID central device 600, and the audio information stored in the audio data units 20a and 20b is updated. , Updating to the new voice information received from the telephone exchange 700, and updating the control information stored in the control data units 30a and 30b to new control information for the control terminal stations 300-1 and 300-2. Then, a transmission frame FL for transmission is generated and transmitted to the control terminal station 300-1.
[0070]
3.4.2 Control terminal and mobile terminal
An outline of transmission between the control terminal station 300 and the portable terminal 400 is shown in FIG. As shown in the figure, the transmission procedure between the control terminal station 300 and the portable terminal 400 is basically the same as the procedure between the maintenance support server 100 and the control terminal station 300 described above. s-equivalent TID information and 420 b / s-equivalent audio information are each transmitted at 100 ms intervals. In addition, line closing control from the mobile terminal 400 and dialing information for the line telephone are transmitted at intervals of 500 ms.
[0071]
3.5 System safety
The safety technique of this system is based on the following concept. That is, the present system is primarily intended to provide useful information for a maintenance company along a railway line, and therefore is based on ensuring stable transmission quality. In addition, with regard to the line closing control, erroneous control is prevented by using together the rationality performed between devices in addition to the transmission quality. Therefore, the system uses the following technique to ensure safety.
[0072]
In other words, it is difficult to achieve fail-safe only by communication or transmission, but this system is positioned as “information causes an error”, and the transmission system performs safety transmission to prevent fail-out due to erroneous information including fault detection. Do. In particular, because both wired and wireless communications are used together, a cyclic broadcast method that treats different transmission qualities as a constant quality, detection of burst and random errors that occur on the line, and prevention of misjudgment due to missed errors are prevented. Take the following actions.
[0073]
(1) Since each wired / wireless communication unit has different transmission quality, as a method for preventing malfunctions and harmful effects, a method of making wireless communication quality equal to wired quality by performing continuous transmission every 50 ms. did.
(2) For the error of wired and wireless message information, CRC verification with high error verification capability and practical performance is used.
(3) In order to improve error detection of control information, a one-control two-bit method is adopted. This method is a method that can reduce the rationality determination on the side of the apparatus that has received the control instruction and the occurrence of erroneous control at the time of oversight error to ½ or less.
(4) In order to monitor the normal operation of each transmission unit, periodic disturbance monitoring and inversion collation for detecting a failure in the transmission circuit are performed to detect a defective transmission unit.
[0074]
As described above, secure transmission is ensured by collating determination, CRC verification, 2-bit control, and detection of a defective transmission unit with cyclic broadcast that performs continuous transmission as the main axis.
[0075]
3.6 Application of combined wired and wireless communication
Note that the communication method applied in this system has a wide range of applications because it can simultaneously use wired communication and wireless communication. In particular, wired communication has a performance of ensuring high-speed communication equivalent to 20 Hz with 50 ms transmission control. The following communication is possible when the information is replaced with other information except for the audio information applied this time.
[0076]
(1) It can be used as an information transmission path including other facilities along the line.
{Circle around (2)} It can be used as a support (along the line) network for the line area where the trunk LAN is laid.
(3) Integration of multi-core cables laid along the railway line, and the use of wireless to eliminate the need for wiring of various facilities.
[0077]
As described above, the combined wired and wireless communication system is a communication system that has the potential to provide new information transmission to future railway facilities, including application to this system.
[0078]
【The invention's effect】
According to the present invention, it is possible to realize a maintenance support system that prevents human error during maintenance work.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a maintenance support system for a CTC section in the present embodiment.
FIG. 2 is a diagram showing specifications of wired communication.
FIG. 3 is a diagram showing specifications of wireless communication.
FIG. 4 shows a wireless system.
FIG. 5 is a diagram for explaining zone identification for preventing interference in wireless communication.
FIG. 6 is a diagram showing an outline of transmission between a maintenance support server and a control terminal station.
FIG. 7 is a diagram showing a physical configuration of a wired communication network between a maintenance support server and a control terminal station.
FIG. 8 is a diagram showing a format configuration of a transmission frame.
FIG. 9 is a block diagram showing a functional configuration of a wired communication unit.
FIG. 10 is a diagram showing an outline of transmission between a control terminal station and a mobile terminal.
[Explanation of symbols]
100 Maintenance support server
200 Station transmission equipment
300 Control terminal
400 Mobile terminal
500 Alarm
600 TID central unit
700 telephone switch
FL transmission frame
10 TID data section
20 (20a-20f) Audio data part
30 (30a-30d) Control data part

Claims (3)

A maintenance support server that communicates with the CTC center and collects TID information, a portable terminal that has a wireless telephone function, and is arranged along the railway line at a predetermined interval, and performs wired communication with the maintenance support server and wireless communication with the portable terminal A maintenance support system configured to include a plurality of control terminal stations, and a wired line connecting the maintenance support server and the control terminal station,
The wired communication is a first transmission method in which a predetermined transmission frame is transmitted so as to circulate in a certain direction on a communication link formed between the maintenance support server and the control terminal station connected by the wired line. And
Wherein the transmission frame includes a TID information, and special information consisting of audio information and control information, a storage area for storing,
The voice information is voice information for calling between the mobile terminals,
The control information includes pre-work start information including a work number, a worker name, and a work type generated by the portable terminal, information for giving approval of a work start generated by the maintenance support server, and work start for each work location. It is notification information to notify the previous train and train delay,
The portable terminal is
Transmitting means for transmitting the pre-work start information to the maintenance support server via the control terminal station;
Receiving means for receiving the notification information from the maintenance support server via the control terminal station,
The maintenance support server
TID updating means for updating the TID information stored in the transmission frame transmitted by the first transmission method to the content of the TID information collected by the maintenance support server, and transmitting the TID information to the control terminal station;
First special information updating means for taking out the control information from the special information stored in the transmission frame and transmitting the control information to the control terminal station as new control information for each control terminal station,
Each control terminal is
When the transmission frame is received from the maintenance support server or an upstream control terminal station, the TID information stored in the received transmission frame and the special information addressed to the local station are extracted and transmitted to the mobile terminal, generates the specials for conveying a special information received from the mobile terminal to the maintenance support server and downstream of the control end point, the special information stored in the transmission frame to update a special information the product A maintenance support system comprising a second special information updating means for transmitting to the maintenance support server or a downstream control terminal station. Maintenance support system according to claim 1 adjacent control terminal stations, characterized in that performing the radio communication with different carrier frequencies. Radio communication between the mobile terminal and the control terminal station according to claim 1 or 2 and the data information and the audio information consisting of the control information is characterized in that it is a second transmission method that are integrated Maintenance support system.

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