JP2020011638A - Present indication control system of traffic signal - Google Patents

Abstract

To reduce the cost of a facility related to present indication control of a traffic signal.SOLUTION: A present indication control system 10 comprises: a power line 18 for supplying power to light a lamp of a traffic signal 14; a first modem 28 connected to the power line 18 to transmit a first information message including present indication information through the power line; a second modem 36 connected to the power line 18 to receive the first information message through the power line; a changeover circuit part 40 for changing a supply destination of power; and a control processing part 42 for controlling the changeover circuit part 40 on the basis of the present indication information included in the first information message. In other word, a power line carrier communication is performed by means of the power line 18 which is indispensable to lighting the lamp of the traffic signal 14 and thereby on the basis of the transmitted present indication information, present indication control of the traffic signal 14 is performed. By this, since a cable laid in the traffic signal 14 is only the power line 18 for supplying power to the traffic signal 14, the facility cost and construction cost can be reduced.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a traffic light presenting control system.

  Trains operate on the basis of traffic signals installed on the ground. The mechanism for this consists of a track circuit device that detects the presence of a train, a switching device that determines the direction of travel, a traffic signal that instructs progress / stop, and an interlocking device that performs overall processing of these devices. It is also called a security device. The present instruction is performed by performing a lighting control corresponding to, for example, any one of advance (G), caution (Y), and stop (R) on the target traffic light by a series of processes of the interlocking device. Execute. FIG. 6 shows an example of the present control circuit of such an interlocking device 100.

  That is, the presenting control by the interlocking device 100 is performed in a structure in which the signal light transformer 104 provided for each traffic light 102 is connected to the traffic light 102 via the disconnection / disconnection detector 106, the relay unit 108, and the signal cable 110. The relay control corresponding to the present is performed by the relay unit 108, and the current is applied to any of the target lamps G, Y, and R to be turned on. The power supplied to the traffic light 102 is obtained by stepping down a rated voltage of 110 V AC of 50 Hz or 60 Hz to a rated voltage of 30 V AC (or 60 V AC) by a signal lamp transformer 104. There is also an example in which a LAN is used for a control signal line between the interlocking device 100 and the traffic light 102 (for example, see Patent Document 1).

JP 2009-1110 A

  Here, although many interlocking devices are now ME (Micro Electronics), as can be seen in FIG. 1, there are still many analog control using a solid multi-core cable (signal cable 110). . That is, since the presenting control by the interlocking device 100 is performed via a multi-core cable connected so as to flow a current for each lamp circuit, the interlocking device 100 outputs four to eight cores for each of the target traffic lights 102. Of multi-core cables are laid. Although this multi-core cable varies depending on the station scale, it has an average length of about 100 m to 300 m, which is equivalent to about 30% of the total when converted into construction costs, which is one of the causes of cost increase. Further, there is room for improvement in the above-described example using the LAN.

  The present invention has been made in view of the above problems, and an object of the present invention is to reduce the cost of equipment related to presenting control of a traffic light.

(Aspect of the invention)
The following aspects of the invention exemplify the configurations of the present invention, and are described in separate sections in order to facilitate understanding of various configurations of the present invention. Each section does not limit the technical scope of the present invention. The components added with the above components can also be included in the technical scope of the present invention.

  (1) A system for performing a display control of a traffic light of a railway equipped with a plurality of lamps in accordance with the display information output from the interlocking device, and laying the signal from the vicinity of the interlocking device to the traffic light. A power line for supplying power for lighting the plurality of light bulbs, an interlocking device-side control unit installed near the interlocking device, and an intervening device between the traffic light and the power line near the traffic light. A signal-side control unit that transmits the notification information from the linking device, and digitally encodes and creates at least a first information message including the notification information. A processing unit; and a first modem coupled to the power line so as to transmit the first information message via the power line, wherein the signal-side control unit includes the first modem via the power line. To receive the information message of A second modem coupled to the power line, a switching circuit for switching power supplied via the power line to be supplied to at least one of the plurality of light bulbs, A control processing unit that controls the switching circuit unit based on the indication information included in the first information telegram acquired from the modem, And an emergency cutoff unit that cuts off the power supply to the light bulb.

  The present control system according to this section includes a power line, an interlocking device-side control unit, and a traffic light-side control unit, and the power line is used for a traffic light having a plurality of light bulbs to light those light bulbs. It supplies power and is laid from near the interlocking device to the traffic light. The interlocking device-side control unit is installed near the interlocking device, and includes a message processing unit and a first modem. The message processing unit receives the notification information output from the interlocking device, digitally encodes and creates a first information message including at least the notification information, and transmits the first information message to the first modem. The first modem is coupled to the power line, and transmits the first information message received from the message processing unit to the signal-side control unit via the power line.

  On the other hand, the traffic light side control unit is installed near the traffic light between the traffic light and the power line, and includes a second modem, a switching circuit unit, a control processing unit, and an emergency cutoff unit. The second modem is coupled to the power line similarly to the first modem, and receives the first information message transmitted from the first modem via the power line as described above. That is, the first modem and the second modem perform power line carrier communication at least in the direction from the interlocking device side control unit to the traffic light side control unit using the power line. The switching circuit is configured to perform switching under the control of the control processing unit such that the power supplied via the power line is supplied to at least one of the plurality of lamps of the traffic light. The emergency cutoff unit cuts off the power supply to all the lamps of the traffic light, and executes the cutoff of the power supply under the control of the control processing unit. The control processing unit acquires the first information message received by the second modem from the first modem, controls the switching circuit unit based on the announcement information included in the acquired first information message, When an abnormality occurs, the traffic light is turned off by controlling the emergency cutoff unit to cut off the power supply.

  That is, the announcement control system described in this section performs power line carrier communication using a power line that is indispensable for lighting each lamp of the traffic signal, and based on the announcement information transmitted by the power line carrier communication, In the traffic signal side control unit installed in the vicinity of, the presenting control of the traffic signal is performed. As a result, the number of cables laid to the traffic signal is reduced to only the power line for supplying power to the traffic signal, as compared with the conventional present control in which current is supplied to each lamp circuit using a multi-core cable. Therefore, equipment costs and construction costs are reduced. Furthermore, since the signal-side control unit is provided with the emergency cut-off unit, if a situation occurs where it is not possible to shift to the predetermined indication due to a failure of the switching circuit unit or the like, the signal-side control unit near the signal side immediately shuts off the power supply immediately. It will be done and the traffic light will be extinguished quickly.

  (2) In the above item (1), the control processing unit includes a plurality of sensors for individually measuring currents flowing through the plurality of light bulbs, and the control processing unit performs, based on current values acquired from the plurality of sensors, In addition to generating security information relating to each of the plurality of lamps, a second information message including at least the security information is digitally encoded and created, and the second modem transmits the second information message via the power line. And the first modem further has a function of receiving the second information message via the power line, and wherein the message processing unit includes the first modem. A notification control system for transmitting the security information included in the second information telegram acquired from the communication device to the interlocking device (Claim 2).

  The present control system according to this section further includes a plurality of sensors for individually measuring the current flowing through the plurality of lamps of the traffic light, and the control processing unit of the traffic light side control unit includes the plurality of sensors. Based on the value of the current flowing through each lamp bulb obtained from the sensor, the maintenance information related to each lamp ball is generated. In other words, the control processing unit detects, for example, when the lamps have a double-array structure, one or all of the lamps, and furthermore, the disconnection of the wiring to each lamp from the current value flowing through each lamp. I do. Then, the detection result is generated as security information related to each lamp, and a second information message including at least the security information is digitally encoded and created.

  Also, the present control system according to this section has a function in which the second modem transmits the second information message via the power line in addition to the function of receiving the first information message, , The first modem has a function of receiving the second information message via the power line in addition to the function of transmitting the first information message. For this reason, the second information telegram created by the control processing unit of the traffic signal side control unit is transmitted from the second modem to the first modem of the interlocking device side control unit via the power line, and the interlocking device side control is performed. The message processing unit of the unit transmits the security information included in the second information message acquired from the first modem to the interlocking device.

  With the above-described configuration, the interlocking device grasps, for each lamp, maintenance information indicating a disconnection, a disconnection, and the like of the plurality of lamps of the traffic light, thereby improving the maintainability. . Further, in the event of disconnection or core disconnection, the control processing unit of the signal side control unit controls the switching circuit unit according to the lampball in which the disconnection or disconnection has occurred, and forcibly stops the signal. This is to make a transition, or to control the emergency cutoff unit to forcibly turn off the traffic light. As a result, even though information is transmitted and received using only the power line, transmission of maintenance information to the interlocking device and emergency response in the event of disconnection or disconnection can be performed without any problem.

  (3) In the above item (2), the first information message and the second information message have the same message configuration including both the present information and the security information, and the message processing is performed. The unit combines the present information transmitted from the interlocking device, and the security information included in the second information message transmitted from the second modem to the first modem, Creating a first information message, the control processing unit including the present information included in the first information message transmitted from the first modem to the second modem; A display control system that creates the second information message by combining the maintenance information generated based on the current value acquired from the second information message (Claim 3).

  In the present control system described in this section, the first information telegram created by the telegram processing unit of the interlocking device side control unit and the second information telegram created by the control processing unit of the traffic light side control unit are different from each other. , Have the same message structure including both the present information and the maintenance information. In order to realize this, the message processing unit combines the present information transmitted from the interlocking device with the security information included in the second information message when creating the first information message, and generates the first information message. Create an information message. That is, the message processing unit acquires the security information from the second information message transmitted most recently from the second modem to the first modem, and uses the security information having the same content as the acquired security information. Then, a first information message is created.

  Similarly, when creating the second information message, the control processing unit combines the present information included in the first information message with the maintenance information generated based on the current values obtained from the plurality of sensors, Create a second information message. That is, the message processing unit acquires, for example, notification information from the first information message transmitted most recently from the first modem to the second modem, and displays the same information as the obtained notification information. A second information message is created using the information. For this reason, the notification information included in the first and second information messages is always updated to the latest content only by the message processing unit to which the notification information is transmitted from the interlocking device, and the first and second information messages are updated. The security information included in the information telegram is always updated to the latest content only by the control processing unit that generates the security information. Thereby, the message processing unit and the control processing unit can easily grasp the update of the present information and the maintenance information by comparing the information message created by itself with the information message transmitted from the other party.

  (4) In the above item (3), the message processing unit and the control processing unit may include, in a presentation data area in which the presentation information in the first information message or the second information message is reflected, When a plurality of data areas corresponding to a plurality of indication types that can be given to the traffic light, a predetermined plurality of bits are secured for each of the plurality of data areas, and when the indication information is reflected in the indication data area, Out of the plurality of data areas, all of the predetermined plurality of bits of the data area corresponding to the type of presentation indicated by the presentation information are set to 1, and the predetermined A present control system for setting all of the plurality of bits to 0 (claim 4).

  In the announcement control system according to this section, the message processing unit and the control processing unit may include: a first and second information telegrams having the same telegram configuration in a notification data area in which the notification information is reflected; This is to secure a plurality of data areas corresponding to a plurality of present types that can be given to a traffic signal. Here, the first and second information telegrams that are digitally coded and created by the telegram processing unit or the control processing unit include a display data area in which the display information is reflected and a security data in which the security information is reflected. And a data area. Therefore, in the present data area, a plurality of data areas corresponding to a plurality of present types, such as "stop", "caution", and "progress", are secured. This is to secure a plurality of bits. For example, when there are three types of indications that can be given to a traffic light, that is, “stop”, “caution”, and “progress”, and the predetermined plurality of bits are four bits, the indication data area in each information message includes “ A 4-bit data area corresponding to “stop”, a 4-bit data area corresponding to “caution”, and a 4-bit data area corresponding to “progress” are secured.

  Then, when the message processing unit and the control processing unit reflect the presentation information in the present data area having the above configuration, the message processing unit and the control processing unit display the present information indicated by the present information among the plurality of data areas of the present data area. In the data area corresponding to the indicated type, all of the predetermined plural bits are set to “1”, and all of the predetermined plural bits of all the remaining data areas are set to “0”. That is, referring to the above example, when the type of the presentation indicated by the presentation information is “caution”, all four bits of the data area corresponding to “caution” in the presentation data area are set to “1”. , And all bits (8 bits in total) of the data area corresponding to “stop” and “progress” of the present data area are set to “0”. In this way, by multi-leveling and reflecting the notification information for each type of notification that can be given to the traffic light, the notification data area is less affected by noise when transmitting and receiving information messages, Is less likely to occur, so that the erroneous indication of the traffic signal is prevented from occurring.

  (5) In the above items (3) and (4), the message processing unit and the control processing unit add a test code when creating the first information message or the second information message, and Performs a cyclic redundancy check on the acquired second information message using the test code included in the second information message acquired from the first modem, and the control processing unit performs A display control system for performing a cyclic redundancy check on the acquired first information message using the test code included in the first information message acquired from the second modem (claim 5).

  In the present control system described in this section, the message processing unit and the control processing unit add a verification code to each information message when creating the first information message or the second information message. Then, when the second information telegram transmitted from the second modem to the first modem is acquired from the first modem, the telegram processing unit adds the second information telegram to the second information telegram by the control processing unit. Using the obtained test code, a cyclic redundancy check of the obtained second information message is performed. Similarly, when the first information message transmitted from the first modem to the second modem is acquired from the second modem, the control processing unit adds the first information message to the first information message by the message processing unit. Using the obtained test code, a cyclic redundancy check of the acquired first information message is performed. In this way, an error or breakage of the received information telegram in the unlikely event of the influence of noise or the like is detected, and the reliability of the entire first and second information telegrams is improved.

(6) In the above items (3) to (5), the first modem repeatedly transmits the first information message at a first predetermined period, and the second modem transmits the first information message. The second information telegram is transmitted as a response to the reception of the telegram, and if the first information telegram has not been received for a predetermined time, the second information telegram is repeatedly transmitted at a second predetermined cycle. A display control system (claim 6).
The present indication control system according to this section defines transmission timing of the first and second information messages, and the first modem repeatedly transmits the first information message at a first predetermined cycle. , The second modem transmits the second information message in response to the reception of the first information message. Here, when the AC power is supplied by the power line, the first predetermined cycle is preferably the same cycle as the frequency of the AC power. As a result, the transmission of the first information message from the first modem and the transmission of the second information message from the second modem are alternately and repeatedly performed in accordance with the cycle of the AC power supply. It will be executed at regular intervals.

  Further, when the second modem has not received the first information message from the first modem for a predetermined time, the second modem repeatedly transmits the second information message at a second predetermined cycle. Here, the predetermined time at that time is an appropriate time corresponding to the first predetermined cycle, and the second predetermined cycle is a cycle related to the first predetermined cycle (in other words, a cycle related to the cycle of the AC power supply). (E.g., twice as long as the AC power supply). Thus, when the first information message has not been received from the first modem for a predetermined time, transmission of the second information message from the second modem is repeatedly performed at a cycle related to the cycle of the AC power supply. On the other hand, the transmission of the first information message from the first modem is repeatedly performed in accordance with the cycle of the AC power supply, regardless of whether or not the second information message has been received from the second modem. Therefore, the first modem and the second modem repeat transmission of the information message from themselves even if reception of the information message from the other party is interrupted, and continue transmission of information, and In preparation for transmission of an information telegram from.

(7) In the above item (6), when the first modem does not continuously detect the response from the second modem a predetermined number of times, the message processing unit may generate an error in a communication system. Is transmitted to the interlocking apparatus, and the control processing unit transmits the second information message a predetermined number of times in the second predetermined cycle while the second modem transmits the second information message a predetermined number of times. When the first information message is not received, the control unit controls the switching circuit unit to stop the traffic light, or controls the emergency cutoff unit to turn off the traffic light. A control system (claim 7).
According to the present control system described in this section, when the first modem does not continuously detect the response from the second modem a predetermined number of times, the message processing unit has an abnormality in the communication system. Is transmitted to the interlocking device. That is, in such a situation, an abnormality occurs in the communication system such as when the second modem fails and cannot transmit, when the first modem fails and cannot receive, or when the power line is disconnected and communication becomes impossible. This is transmitted to the interlocking device.

  In addition, the control processing unit determines that the second modem transmits the second information message a predetermined number of times at the second predetermined period while the second modem transmits the second information message, because the reception of the first information message is interrupted. If the information message No. 1 is not received, in other words, if the reception from the first modem is interrupted for a while, the switching circuit is controlled to force the signal regardless of the signal present. The emergency stop unit is controlled, or the traffic light is forcibly turned off by controlling the emergency shutoff unit. That is, in such a situation, an abnormality occurs in the communication system, such as when the first modem fails and cannot transmit, when the second modem fails and cannot receive, or when the power line is disconnected and communication becomes impossible. Occurs when For this reason, depending on whether or not the power line is disconnected, the traffic light is stopped or lighted or turned off. Thus, when an abnormality occurs in the communication system, the information is promptly transmitted to the interlocking device, and the traffic light is quickly shifted to the stop indication or the extinguishment, so that safety measures are quickly taken.

(8) In the above item (6) or (7), the control processing section may include three pieces of the present information included in the first information message received three times most recently via the second modem. When two or more pieces of presenting information that are different from the present contents of the traffic light and coincide with the contents are included, the switching circuit unit is controlled in accordance with the contents of the present information, A display control system for changing the display contents (claim 8).
The present control system according to the present aspect is configured such that, of the first information messages repeatedly transmitted from the first modem, the first information message received by the control processing unit via the second modem three times most recently. See Then, the three pieces of notification information included in the three most recent first information telegrams include two or more pieces of notification information that differ from the current content of the traffic light and have the same content. In such a case, the control processing unit controls the switching circuit unit in accordance with the contents of the present information, and changes the present contents of the traffic light. That is, only when three or two pieces of present information in the latest three pieces of present information match each other, the control processing unit adopts the present information as new present information and outputs the new information to the traffic light. It is to reflect. With this, even if the first information message including erroneous announcement information that has been suddenly changed due to the influence of noise or the like is mixed in the first information message repeatedly transmitted, such a case is possible. Since the unnecessary announcement information is eliminated without being adopted, the announcement control with more security is performed.

(9) The present control system according to the above (2) to (8), wherein the first modem and the second modem transmit and receive in a frequency band of 450 kHz or less (claim 9).
In the present control system described in this section, the first modem and the second modem transmit and receive the first and second information messages in a frequency band of 450 kHz or less. Here, for example, when an AC power supply (commercial power supply) is supplied by a power line, instantaneous noise generated when a power supply of a device connected to the AC power supply is turned on / off is caused by a frequency (50 Hz or 60 Hz) of the AC power supply. Often occurs in synchronization with the half cycle time. Therefore, by performing communication in a band of 450 kHz or less having a relatively large S / N ratio while avoiding such a frequency band, the first and second information telegrams can be transmitted and received stably.

(10) The present control system according to the above (2) to (9), wherein the first modem and the second modem use frequency shift keying as a modulation method (claim 10).
In the present control system described in this section, the first modem and the second modem use frequency shift keying (FSK) as a modulation method of power line carrier communication. Frequency shift keying has the characteristics of being simple and resistant to signal deterioration and noise among various modulation methods, so that communication quality is ensured and the configuration of the first and second modems is simplified. Is what is done.

(11) The display control system according to any one of (1) to (10), wherein the switching circuit unit is configured using a solid state relay.
In the present control system described in this section, the switching circuit is configured using a solid-state relay having a feature that ON / OFF control is performed at a voltage near the zero crossing of a voltage waveform. Abrupt changes in current at the time and noise are suppressed. Furthermore, when an LED is used for a light bulb of a traffic light, it exhibits excellent performance in insulation and dimming.

(12) In the above items (1) to (11), the power line is a two-core cable for supplying AC power, and a position where the first modem is connected and a position where the second modem is connected. The control system according to claim 12, wherein a common mode coil is provided between the control system and the control unit.
The present control system according to this section is a two-core cable in which the power line supplies AC power, and further comprises a power line between a position where the first modem is coupled and a position where the second modem is coupled. Is provided with a common mode coil. As a result, the normal mode is adopted as the signal superposition method of the power line carrier communication, and the effect of noise generated due to the fluctuation of the voltage of the AC power supply or the like is prevented.

  Since the present invention is configured as described above, it is possible to suppress the cost of equipment related to the present control of the traffic light.

It is a mimetic diagram showing typically a display control system concerning an embodiment of the invention. It is an example of the specification table of the power line carrier communication performed by the display control system concerning embodiment of this invention. 4 shows an example of a message configuration of an information message transmitted / received by power line carrier communication of the present control system according to the embodiment of the present invention. 4 shows an outline of transmission control in power line carrier communication of the present control system according to the embodiment of the present invention. 1 shows an outline of a conventional display control circuit when an LED is used for a light bulb. 1 shows an outline of a present control circuit using a conventional interlocking device.

Hereinafter, embodiments for implementing the present invention will be described with reference to the accompanying drawings. In the drawings, the same portions or corresponding portions are denoted by the same reference numerals. In addition, detailed description of the same or corresponding parts as in the related art will be omitted.
FIG. 1 schematically shows a configuration of a presenting control system 10 according to an embodiment of the present invention, in which three traffic lights G, Y, and R are provided as traffic lights 14 to be subjected to presenting control. Then, an example is shown in which each lamp bulb G, Y, R is a signal bulb having a double filament structure. The display control system 10 according to the embodiment of the present invention includes a power line 18, an interlocking device-side control unit 24, a traffic light-side control unit 34, and a plurality of sensors 50, as shown in FIG. The power line 18 supplies electric power for lighting a plurality of lamps (three lamps G, Y, and R in the example of FIG. 1) included in the traffic light 14. In the present embodiment, the frequency is 50 Hz or An AC power supply of 60 Hz and a rated voltage of AC 110 V is supplied to the traffic light 14 by an AC power supply that is stepped down to 30 V AC (or 60 V) by the signal lamp transformer 16. The power line 18 is a two-core cable, and a common mode coil 20 is provided in the middle thereof.

  The interlocking device-side control unit 24 is installed near the interlocking device 12 (an electronic interlocking device or a relay interlocking device that is a higher-level device), and includes a message processing unit 26, a first modem 28, and a coupling circuit 30. The message processing unit 26 exchanges information with the interlocking device 12. For example, the message processing unit 26 transmits the present information of the traffic light 14 from the interlocking device 12 and transmits the later-described maintenance information to the interlocking device 12. . The electronic message processing unit 26 digitally encodes and creates the first information electronic message based on the present information of the traffic signal 14 transmitted from the interlocking device 12 and the maintenance information described later, which will be described in detail later. , And transmits the created first information message to the first modem 28. Further, the message processing unit 26 acquires a second information message described below from the first modem 28, and transmits the security information included in the second information message to the interlocking device 12 as described above. In addition, it is used to create a first information message. As will be described later in detail, the message processing unit 26 detects an abnormality in the communication system such as the power line 18, the first modem 28 and the second modem 36 based on the transmission state and the reception state of the first modem 28. It monitors whether or not it has occurred, and notifies the interlocking device 12 if an abnormality has occurred. The message processing unit 26 is configured by combining hardware such as various integrated circuits and software, for example.

  The first modem 28 includes a transmitting unit 28a and a receiving unit 28b, and performs power line carrier communication with a second modem 36 of the traffic light side control unit 34 via the power line 18, as described below. It is coupled to the power line 18 by the coupling circuit 30. Specifically, the transmission unit 28a of the first modem 28 transmits the first information telegram created by the telegram processing unit 26 to the second modem 36 of the traffic light side control unit 34 via the power line 18. I do. The receiving section 28b of the first modem 28 receives the second information telegram transmitted from the second modem 36 of the traffic light side control section 34 via the power line 18 and transmits it to the telegram processing section 26. I do. Various modems capable of performing power line carrier communication are used as the first modem 28.

  On the other hand, the traffic light side control unit 34 is installed near the traffic light 14 between the traffic light 14 and the power line 12, and is provided with the second modem 36, the coupling circuit 38, the switching circuit unit 40, the control processing unit 42, and the emergency processing unit 42. A blocking section 44 is provided. The second modem 36 has a transmitting unit 36a and a receiving unit 36b, and is coupled so as to perform power line carrier communication with the first modem 28 of the interlocking device-side control unit 24 via the power line 18. It is coupled to the power line 18 by a circuit 38. Specifically, the transmitting unit 36a of the second modem 36 transmits the second information message created by the control processing unit 42 to the first information of the interlocking device-side control unit 24 via the power line 18 as described later. Transmit to modem 28. Also, the receiving unit 36b of the second modem 36 receives the first information message transmitted from the first modem 28 of the interlocking device-side control unit 24 via the power line 18, and sends the first information message to the control processing unit 42. introduce. As with the first modem 28, various modems capable of power line carrier communication are used as the second modem 36.

  The control processing unit 42 creates a second information message, and controls the switching circuit unit 40 and the emergency cutoff unit 44 based on information acquired from the second modem 36 and the plurality of sensors 50 and the like. Specifically, the control processing unit 42 acquires the first information message transmitted from the first modem 28 of the interlocking device-side control unit 24 from the second modem 36, and adds the acquired first information message to the acquired first information message. Extract the contained announcement information. Then, by controlling the switching circuit unit 40 based on the extracted notification information, the traffic light 14 is shifted to the notification corresponding to the notification information. Further, the control processing unit 42 generates maintenance information on each of the lamps G, Y, and R of the traffic light 14 based on the current values acquired from the plurality of sensors 50.

  Here, each of the plurality of sensors 50 is installed so as to individually measure the current flowing through each of the lamps G, Y, and R of the traffic light 14. In the present embodiment, three lamps G, Y , R, three sensors 50 are provided. The control processing unit 42 obtains current values flowing through each of the lamps G, Y, and R from the plurality of sensors 50, and based on these current values, there is no abnormality, occurrence of one-sided breakage, occurrence of total breakage, occurrence of breakage, Is determined in units of the light bulbs G, Y, and R. Then, from these determination results, maintenance information related to each of the lamps G, Y, and R is generated, and based on the generated maintenance information and the announcement information extracted from the first information message as described above, The second information message is digitally encoded and created, and the created second information message is transmitted to the second modem 36.

  Further, as will be described in detail later, the control processing unit 42 detects an abnormality in the communication system such as the power line 18, the first modem 28, and the second modem 36 based on the transmission state and the reception state of the second modem 36. In addition to monitoring whether or not an error has occurred, whether or not an abnormality has occurred in the switching circuit unit 40 is monitored. Then, when it is determined that an abnormality has occurred in the communication system or the switching circuit unit 40 and / or when an abnormality is included in the above-described determination result of the lamp bulbs G, Y, and R, an abnormality has occurred. As a response to the situation, the switching circuit unit 40 or the emergency cutoff unit 44 is controlled according to the content of the abnormality. The control processing unit 42 is configured by, for example, combining hardware and software such as various integrated circuits, and various current sensors are used for each of the plurality of sensors 50.

  The switching circuit unit 40 receives the control from the control processing unit 42 and sets the supply destination of the AC power supplied via the power line 18 to at least one of the plurality of lamps G, Y, and R of the traffic light 14. It is one that switches to one. In the present embodiment, the switching circuit unit 40 is configured using a solid-state relay so as to supply AC power to any one of the three lamps G, Y, and R. However, the switching circuit unit 40 may have another circuit configuration. The emergency cutoff unit 44 cuts off the supply of AC power to all the lamps G, Y, R of the traffic light 14 under the control of the control processing unit 42. Various types of shutoff circuits can be used for the emergency shutoff unit 44.

Next, FIG. 2 shows the first modem 28 of the interlocking device side control unit 24 and the second modem 36 of the traffic light side control unit 34 of the present control system 10 according to the embodiment of the present invention. 2 shows a specification table of power line carrier communication executed using the power line 18. Note that the content of the specification table in FIG. 2 is an example, and does not limit each item of the power line carrier communication executed in the present control system 10 according to the embodiment of the present invention.
The power line carrier uses a low-speed group of 450 kHz or less among a low-speed group of 450 kHz or less (so-called narrow band PLC) and a high-speed group of 2 MHz or more (so-called broadband PLC).

As a commercial power supply, an AC power supply of AC 110 V or less with a frequency of 50 Hz or 60 Hz is used. This is used after being stepped down by the signal lamp transformer 16 shown in FIG.
The normal mode is applied to the signal superimposition method. As shown in FIG. 1, a common mode coil 20 is provided on the secondary side of the signal lamp transformer 16.
The modulation scheme utilizes frequency shift keying (FSK), which assigns a "1" signal and a "0" signal to two different frequencies.
The transmission waveform is a baseband communication system (baseband system) in which binary digital information is simply converted into a pulse signal and transmitted, and the transmission line code is an NRZI signal.

The transmission speed is 4800 bps at the maximum. As will be described later, the length of each of the first and second messages to be transmitted and received is 80 bits.
The transmission control method is a cyclic fixed-cycle start at every 50 Hz or 60 Hz in consideration of the frequency of the commercial power supply. This cyclic period will be described later in detail.
The code test uses a continuous transmission method of 3C2 in addition to the CRC16 test of the cyclic redundancy check. Here, the 3C2 continuous transmission method is mainly applied to the announcement information included in the first message, and will be described later in detail.

  Next, with reference to FIG. 3, a description will be given of a message configuration of first and second information messages that are transmitted and received in presenting control system 10 according to the embodiment of the present invention. As described above, the first information message is created by digital encoding by the message processing unit 26 of the interlocking device-side control unit 24, and the second information message is digitally encoded by the control processing unit 42 of the signal-side control unit 34. It is created by encoding. Here, the message configuration shown in FIG. 3 is such that a “stop” indication is a lamp R, a “caution” indication is a lamp Y, a “progress” indication is a lamp G, and a “warning” indication is two lights. The ball Y, the "deceleration" indication is indicated by a lamp ball Y and a lamp ball G, and the "high-speed" indication is indicated by two lamp balls G, corresponding to a traffic light 14 of a 6-indication, 6-lamp type. Note that the message configuration in FIG. 3 is an example, and does not limit the configurations of the first and second information messages.

  The first and second information messages have a message structure in common as illustrated, and include a start area SA, an information type area KA, a present data area CA, a security data area MA, and a test code area TA. . The start area SA is a data area indicating the start of an information telegram, and has an 8-bit configuration in the present embodiment. The information type area KA is a data area indicating the type of each information message. In the present embodiment, the information type area KA includes 4 bits indicating a transmission source and 4 bits indicating a reception source. The present data area CA is a data area indicating present information, and a 4-bit data area is reserved for each present type. That is, in the present embodiment, a 4-bit data area ca1 indicating a “stop” indication, a 4-bit data area ca2 indicating a “caution” indication, a 4-bit data area ca3 indicating a “progress” indication, A 24-bit data area ca4 indicating a "warning" indication, a 4-bit data area ca5 indicating a "deceleration" indication, and a 4-bit data area ca6 indicating a "high-speed" indication are a total of 24 bits. The present data area CA is secured.

  The security data area MA is a data area indicating security information, and a 4-bit data area is reserved for each type of information, similarly to the current data area CA. That is, in the present embodiment, a 4-bit data area ma1 corresponding to the “stop” indication, a 4-bit data area ma2 corresponding to the “caution” indication, and a 4-bit data area corresponding to the “progress” indication An area ma3, a 4-bit data area ma4 corresponding to the "warning" indication, a 4-bit data area ma5 corresponding to the "deceleration" indication, and a 4-bit data area ma6 corresponding to the "high-speed" indication , A total of 24-bit security data area MA is secured. The test code area TA is an area to which a test code for performing the CRC16 test of the cyclic redundancy check described above is added, and has a 16-bit configuration. The first and second information messages have the above-described message structure, and the length of one message is 80 bits in total.

  When the first information message is created by the message processing unit 26, predetermined data indicating the start of the message is reflected in the start area SA and appropriate data indicating the type of each information message is displayed in the information type area KA. Is reflected. In the present data area CA, the present information is reflected by a multi-valued expression in which all bits of the data area corresponding to the present indicated by the present information are set to “1”. That is, of the plurality of data areas ca1 to ca6 forming the present data area CA, all bits of the data area corresponding to the present indicated by the present information transmitted from the interlocking device 12 are set to “1”, All bits of all remaining data areas are set to “0”. For example, when notification information indicating “progress” is transmitted from the interlocking device 12, the message processing unit 26 sets all four bits of the data area ca3 corresponding to “progress” to “1” and sets the remaining data area ca1 , Ca2, ca4 to ca6 are all set to “0”. In the secure data area MA, for example, the content of the secure information (the value of the secure data area MA) included in the second information message transmitted most recently from the second modem 36 to the first modem 28 is stored. Is copied and reflected as it is. An appropriate test code is calculated and reflected in the test code area TA based on the data reflected in the start area SA, the information type area KA, the present data area CA, and the security data area MA.

  When the second information message is created by the control processing unit 42, predetermined data indicating the start of the message is reflected in the start area SA and appropriate data indicating the type of each information message is displayed in the information type area KA. Is reflected. In the present data area CA, for example, the contents of present information (of the present data area CA) included in the first information message transmitted most recently from the first modem 28 to the second modem 36 are shown. Value) is copied and reflected as is. In the maintenance data area MA, the maintenance information on each lamp of the traffic light 14 generated by the control processing unit 42 as described above is reflected. That is, for example, of the six lamps of the traffic light 14, if the maintenance information indicating the disconnection is generated for the lamp Y for indicating the “caution” present, the “caution” of the maintenance data area MA In the 4-bit data area ma2 corresponding to the current indication, data indicating that the core is disconnected is reflected. When the maintenance information indicating that there is no abnormality is generated for the other lamps of the traffic light 14, the abnormality is stored in each of the data areas ma1, ma3 to ma6 corresponding to the remaining indication of the maintenance data area MA. The data indicating none is reflected. An appropriate test code is calculated and reflected in the test code area TA based on the data reflected in the start area SA, the information type area KA, the present data area CA, and the security data area MA.

  Next, FIG. 4 shows an outline of transmission control of power line carrier communication performed by the present control system 10 according to the embodiment of the present invention. As shown in the figure, the communication performed by the one-sided configuration of the first modem 28 and the second modem 36 is based on one-way communication, and as described above, every 50 Hz or 60 Hz in consideration of the frequency of the commercial power supply. This is performed by the cyclic fixed period method. That is, the first modem 28 sends the first modem generated by the message processing unit 26 to the second modem 36 at a cycle of 50 Hz or 60 Hz (first predetermined cycle) in accordance with the frequency of the AC power supply. Send the information message repeatedly. On the other hand, the second modem 36 sends the second information generated by the control processing unit 42 to the first modem 28 as a response to the reception of the first information message transmitted from the first modem 28. Send a message. As a result, the first information telegram and the second information telegram are repeatedly and alternately transmitted at a cycle of 50 Hz or 60 Hz while the one-way communication is maintained.

  When receiving the second information message from the second modem 36, the first modem 28 transmits the received second information message to the message processing unit 26. Then, the message processing unit 26 performs a cyclic redundancy check on the second information message using the test code included in the test code area TA of the transmitted second information message, and determines that there is no problem. In this case, the security information is extracted from the security data area MA of the second information message. Then, the extracted maintenance information is transmitted to the interlocking device 12, and is used when creating the first information message as described above. On the other hand, when receiving the first information message from the first modem 28, the second modem 36 transmits the received first information message to the control processing unit 42. Then, the control processing unit 42 performs a cyclic redundancy check on the first information message using the test code included in the test code area TA of the transmitted first information message, and determines that there is no problem. In this case, the present information is extracted from the present data area CA of the first information message. Then, the extracted present information is used when creating the second information message as described above, and is used for controlling the switching circuit unit 40 as described below.

  That is, the control processing unit 42 repeatedly obtains the first information message repeatedly transmitted from the first modem 28 via the second modem 36 as described above, Are compared with the three pieces of present information extracted from the information message. If the three pieces of presenting information include two or more pieces of presenting information that are different from the present present contents of the traffic light 14 and have the same contents, the contents of the present present information are , The switching circuit 40 is controlled in accordance with, and the present content of the traffic light 14 is changed. Thus, the present control of the traffic light 14 is performed using the 3C2 continuous transmission system.

  Here, a description will be given of a process performed by the presentation control system 10 according to the embodiment of the present invention when an abnormality occurs. First, referring to FIG. 4, first modem 28 repeatedly performs transmission at a cycle of 50 Hz or 60 Hz, and continues transmission processing even if there is no response from second modem 36 to those transmissions. I do. Therefore, if there is no response from the second modem 36 a predetermined number of times (for example, three times) consecutively for transmission from the first modem 28 (see the diagonally downwardly dashed arrow in FIG. 4), the first It is considered that an abnormality has occurred in any of the communication systems, such as the receiving unit 28b, the power line 18, and the transmitting unit 36a and the receiving unit 36b of the second modem 36. 26 notifies the interlocking device 12. Note that if there is a response from the second modem 36 while the first modem 28 has transmitted a predetermined number of times, the process returns to the above-described cyclic regular cycle.

  On the other hand, the second modem 36 basically transmits as a response to the transmission from the first modem 28, but the transmission from the first modem 28, which is to be repeatedly executed, is changed to the first modem 28. If the transmission for the first modem 28 is interrupted for a predetermined time corresponding to the transmission cycle (50 Hz or 60 Hz) from the first power supply, the transmission to the first modem 28 is stopped at a cycle (second predetermined cycle, for example, (25 Hz or 30 Hz, which is twice as large). If there is no transmission from the first modem during a predetermined number of times (for example, three times) from the second modem 36 (for example, three diagonally upward arrows in FIG. 4), the reception by the second modem 36 is performed. It is considered that an abnormality has occurred in any of the communication systems such as the unit 36b, the power line 18, and the transmission unit 28a and the reception unit 28b of the first modem 28. For this reason, for example, when disconnection of the power line 18 is considered, the control processing unit 42 controls the emergency cutoff unit 44 to forcibly turn off the traffic light 14, and otherwise, the control processing unit 42 performs switching. By controlling the circuit unit 40, the traffic light 14 is forcibly stopped and displayed. If there is a transmission from the first modem 28 during a predetermined number of transmissions from the second modem 36, the process returns to the above-described cyclic constant cycle.

  Further, the control processing unit 42 monitors the occurrence of an abnormality in the switching circuit unit 40 as described above. If an abnormality occurs in the switching circuit unit 40, for example, when it is possible to shift to the stop indication, The switching circuit 40 is controlled to forcibly shift to the stop indication, and when it is impossible to shift to the stop indication, the emergency cutoff unit 44 is controlled to forcibly turn off the traffic light 14. Further, when generating the maintenance information based on the current values of the plurality of sensors 50, the control processing unit 42 determines that any of the lamps G, Y, and R of the traffic light 14 has a broken core or a broken wire. When it is determined, for example, when the lamp bulb R has no abnormality and the stop indication is possible, the switching circuit 40 is controlled to forcibly shift to the stop indication. When it is not possible, the traffic light 14 is forcibly turned off by controlling the emergency shutoff unit 44.

  By the way, according to the embodiment of the present invention having the above configuration, the following operation and effect can be obtained. That is, the display control system 10 according to the embodiment of the present invention includes the power line 18, the interlocking device-side control unit 24, and the traffic light-side control unit 34 as shown in FIG. Supplies power for lighting the lamps G, Y, and R to the traffic light 14 having three lamps G, Y, and R. Is laid. The interlocking device-side control unit 24 is installed near the interlocking device 12 and includes a message processing unit 26 and a first modem 28. The message processing unit 26 receives the notification information output from the interlocking device 12 and digitally encodes and creates a first information message including at least the notification information (see FIG. 3). To communicate. The first modem 28 is coupled to the power line 18 via the coupling circuit 30, and transmits the first information telegram received from the telegram processing unit 26 to the traffic signal side control unit 34 via the power line 18.

  On the other hand, the traffic light side control unit 34 is installed near the traffic light 14 between the traffic light 14 and the power line 18, and controls the second modem 36, the switching circuit unit 40, the control processing unit 42, and the emergency cutoff unit 44. Contains. The second modem 36 is coupled to the power line 18 via the coupling circuit 38 similarly to the first modem 28, and converts the first information message transmitted from the first modem 28 to the power line 18 as described above. Receive through. That is, the first modem 28 and the second modem 36 use the power line 18 to perform power line carrier communication at least in the direction from the interlocking device side control unit 24 to the traffic light side control unit 34. The switching circuit unit 40 receives control from the control processing unit 42 such that the power supplied via the power line 18 is supplied to at least one of the three lamps G, Y, and R of the traffic light 14. Switching. The emergency cutoff unit 44 cuts off the power supply to all the lamps G, Y, and R of the traffic light 14, and executes the cutoff of the power supply under the control of the control processing unit 42. The control processing unit 42 acquires the first information message received by the second modem 36 from the first modem 28, and controls the switching circuit unit 40 based on the present information included in the acquired first information message. In addition to the control, when an abnormality occurs, the emergency stop unit 44 is controlled to cut off the power supply, thereby turning off the traffic light 14.

  That is, the display control system 10 according to the embodiment of the present invention performs power line carrier communication using the power line 18 that is indispensable for lighting each of the lamps G, Y, and R of the traffic light 14, and performs the power line carrier communication. Based on the announcement information transmitted by communication, an announcement control of the traffic signal 14 is performed by the traffic signal side control unit 34 installed near the traffic signal 14. As a result, the cable laid on the traffic light 14 is transmitted to the traffic light 14 in comparison with the conventional present control in which a current is supplied to each lamp circuit using a multi-core cable as shown in FIG. Since it is reduced to only the power line 18 for supplying power, facility costs and construction costs can be reduced.

  Further, since the traffic signal side control unit 34 is provided with the emergency cutoff unit 44, if a situation occurs in which it is not possible to shift to the predetermined indication due to a failure of the switching circuit unit 40 or the like, the traffic signal side control unit 34 near the traffic signal 14 immediately Emergency cutoff of the power supply is performed, and the traffic light 14 can be quickly turned off. In addition, the first and second modems 28, 36 are coupled to the power line 18 via coupling circuits 30, 38 as shown in FIG. , And only the high frequency component of the carrier wave transmitted from the first and second modems 28 and 36 can flow on the wiring. As a result, both supply of the power supply voltage and communication can be performed on the power line 18 at the same time.

  Further, the display control system 10 according to the embodiment of the present invention further includes a plurality of (three in the example of FIG. 1) for individually measuring the current flowing through the plurality of lamps G, Y, and R of the traffic light 14. ), And the control processing unit 42 of the traffic light side control unit 34 determines each lamp ball G based on the current value flowing through each lamp ball G, Y, R acquired from the plurality of sensors 50. , Y, and R are generated. That is, the control processing unit 42 determines, based on the current value flowing through each of the lamps G, Y, and R, for example, when each of the lamps G, Y, and R has a double-arranged structure, has a one-sided cut of Detects all core disconnections and further disconnections of the wiring to each of the lamps G, Y, and R. Then, the detection result is generated as security information relating to each of the lamps G, Y, and R, and a second information message including at least the security information is digitally encoded and created (see FIG. 3).

  Further, in the presenting control system 10 according to the embodiment of the present invention, the second modem 36 transmits the second information message via the power line 18 in addition to the function of the second modem 36 receiving the first information message. The first modem 28 has a function of receiving the second information message via the power line 18 in addition to the function of transmitting the first information message. Therefore, the second information telegram created by the control processing unit 42 of the traffic light side control unit 34 is transmitted from the second modem 36 to the first modem 28 of the interlocking device side control unit 24 via the power line 18. Then, the telegram processing unit 26 of the interlocking device side control unit 24 transmits the security information included in the second information telegram acquired from the first modem 28 to the interlocking device 12.

  With the above-described configuration, the interlocking device 12 can grasp the maintenance information indicating the disconnection or disconnection of the plurality of lamps G, Y, and R of the traffic light 14 for each lamp G, Y, and R. Therefore, as shown in FIG. 6, the disconnection / disconnection detector 106 of another device detects the disconnection or disconnection of all the lamps G, Y, R at the same time as the conventional present control circuit. In comparison, it is possible to improve the maintainability. Further, when a disconnection or a disconnection occurs, the control processing unit 42 of the traffic signal side control unit 34 controls the switching circuit unit 40 in accordance with the lamp bulbs G, Y, and R in which the disconnection or the disconnection has occurred, and Is forcibly shifted to the stop indication, or the emergency cutoff unit 44 is controlled to forcibly turn off the traffic light 14. Thereby, although information is transmitted and received using only the power line 18, transmission of maintenance information to the interlocking device 12 and emergency response in the event of disconnection or disconnection can be performed without any problem. .

Also, the present control system 10 according to the embodiment of the present invention is configured using a solid-state relay having a feature that the switching circuit unit 40 performs ON / OFF control at a voltage near the zero cross of the voltage waveform. As a result, it is possible to suppress a sudden change in current and noise during opening and closing. In addition, when LEDs are used for the light bulbs G, Y, and R of the traffic light 14, performance excellent in insulation and dimming properties can be exhibited.
Further, in the present control system 10 according to the embodiment of the present invention, the power line 18 is a two-core cable for supplying AC power, and the position of the power line 18 to which the first modem 28 is coupled is connected to the second line. The common mode coil 20 is provided between the position where the modem 36 is coupled. This makes it possible to adopt the normal mode (see FIG. 2) as the signal superimposition method of the power line carrier communication and to prevent the influence of noise generated due to the fluctuation of the voltage of the AC power supply or the like.

  As shown in FIG. 2, the present control system 10 according to the embodiment of the present invention is configured such that the first modem 28 and the second modem 36 transmit the first and second information in a frequency band of 450 kHz or less. It sends and receives messages. Here, when an AC power supply (commercial power supply) is supplied via the power line 18 as in the example of FIG. 1, the instantaneous noise generated when the power supply of the device connected to the AC power supply is turned on / off is the AC power supply. It often occurs in synchronization with the half cycle time of the power supply frequency (50 Hz or 60 Hz). Therefore, by performing communication in a band of 450 kHz or less having a relatively large S / N ratio while avoiding such a frequency band, the first and second information telegrams can be transmitted and received stably. Further, the first modem 28 and the second modem 36 are frequency shift keying (FSK), which are characterized by being simple and resistant to signal deterioration and noise among various modulation schemes as a modulation scheme for power line carrier communication. ), Communication quality can be ensured and the configuration of the first and second modems 28 and 36 can be simplified.

  Further, the presenting control system 10 according to the embodiment of the present invention uses the first information telegram created by the telegram processing unit 26 of the interlocking device side control unit 24 and the control processing unit 42 of the traffic light side control unit 34. The created second information telegram has the same telegram configuration including both the present information and the maintenance information as shown in FIG. 3, for example. To realize this, the message processing unit 26 combines the present information transmitted from the interlocking device 12 with the maintenance information included in the second information message when creating the first information message, Create an information message of No. 1. That is, the message processing unit 26 obtains the security information from the second information message transmitted most recently from the second modem 36 to the first modem 28, and obtains the security information having the same content as the acquired security information. A first information message is created using the information.

  Similarly, when creating the second information message, the control processing unit 42 combines the present information included in the first information message with the maintenance information generated based on the current values acquired from the plurality of sensors 50. Then, a second information message is created. That is, the message processing unit 42 acquires the present information from, for example, the first information message transmitted most recently from the first modem 28 to the second modem 36 and has the same content as the acquired present information. A second information message is created using the present information. For this reason, the notification information included in the first and second information messages can always be updated to the latest content only by the message processing unit 26 to which the notification information is transmitted from the interlocking device 12. The security information included in the first and second information telegrams can always be updated to the latest content only by the control processing unit 42 that generates security information. Thereby, the message processing unit 26 and the control processing unit 42 can easily grasp the update of the present information and the maintenance information by comparing the information message created by itself and the information message transmitted from the other party. it can.

  Further, in the notification control system 10 according to the embodiment of the present invention, the message processing unit 26 and the control processing unit 42 reflect the notification information in the first and second information messages having the same message configuration. A plurality of data areas corresponding to a plurality of types of indications that can be given to the traffic light 14 are displayed in the displayed data area CA. In the example of FIG. Six data areas ca1 to ca6 corresponding to the six indications of "high speed" are secured. Here, the first and second information telegrams which are digitally coded and created by the telegram processing unit 26 or the control processing unit 42 reflect the present data area CA in which the present information is reflected, and the maintenance information are reflected. Security data area MA to be stored. Therefore, in the present data area CA, a plurality of data areas ca1 to ca6 corresponding to the plurality of present types as described above are secured, and a predetermined plurality of bits (see FIG. In the example of 3, four bits are reserved.

  Then, the message processing unit 26 and the control processing unit 42, when reflecting the notification information in the notification data area CA having the above-described configuration, among the plurality of data areas ca1 to ca6 of the notification data area CA, In the data area corresponding to the type of the presentation indicated by the presentation information, all predetermined plural bits are set to “1”, and all of the predetermined plural bits in all the remaining data areas are set to “0”. I do. That is, in the example of FIG. 3, when the type of the presentation indicated by the presentation information is “attention”, all four bits of the data area ca2 corresponding to “attention” of the presentation data area CA are set to “1”. , And all bits (20 bits in total) of the data areas ca1, ca3 to ca6 corresponding to other indications in the indication data area CA are set to “0”. In this way, by multi-valued and reflecting the notification information for each type of the notification that can be given to the traffic light 14, it is possible to make the notification data area CA less susceptible to noise during transmission and reception of the information message. In addition, it is possible to make it difficult for an oversight error to occur, so that it is possible to prevent the erroneous indication of the traffic light 14 from occurring.

  Also, the presenting control system 10 according to the embodiment of the present invention, when creating the first information message or the second information message, the message processing unit 26 and the control processing unit 42 use the verification code area of each information message. A test code (for example, a CRC16 test code) is added to TA. When the second information message transmitted from the second modem 36 to the first modem 28 is acquired from the first modem 28, the message processing unit 26 uses the second The cyclic redundancy check of the acquired second information message is performed using the test code added to the information message. Similarly, when the control processing unit 42 acquires the first information message transmitted from the first modem 28 to the second modem 36 from the second modem 36, the message processing unit 26 The cyclic redundancy check of the acquired first information message is performed by using the test code added to the information message. This makes it possible to detect an error or breakage of the received information telegram in the event of an influence of noise or the like, thereby improving the reliability of the entire first and second information telegrams.

  Further, in the presenting control system 10 according to the embodiment of the present invention, as shown in FIG. 4, transmission timings of the first and second information messages are defined, and the first modem 28 The first information message is repeatedly transmitted at a first predetermined cycle, and the second modem 36 transmits the second information message as a response to the reception of the first information message. Here, the first predetermined cycle is 50 Hz or 60 Hz, which is the same cycle as the frequency of the AC power supply when the AC power is supplied through the power line 18. Thus, the transmission of the first information message from the first modem 28 and the transmission of the second information message from the second modem 36 are alternately and repeatedly performed in accordance with the cycle of the AC power supply. It is executed in a cyclic fixed cycle (see FIG. 2).

  Further, when the second modem 36 does not receive the first information message from the first modem 28 for a predetermined time, the second modem 36 repeatedly transmits the second information message at a second predetermined cycle. Here, the predetermined time is an appropriate time according to the first predetermined cycle, and the second predetermined cycle is a cycle related to the first predetermined cycle (for example, a cycle twice as long as the AC power supply). It is. Thereby, when the first information message is not received from the first modem 28 for a predetermined time, the transmission of the second information message from the second modem 36 is repeated at a cycle related to the cycle of the AC power supply. On the other hand, the transmission of the first information message from the first modem 28 is repeatedly performed in accordance with the cycle of the AC power supply, regardless of whether or not the second information message has been received from the second modem 36. . Therefore, the first modem 28 and the second modem 36 continue transmission of information by repeatedly transmitting information messages from themselves even when reception of information messages from the other party is interrupted. In addition to this, it is possible to prepare for transmission of an information message from the other party.

  Also, when the first modem 28 does not continuously detect the response from the second modem 36 a predetermined number of times, the display control system 10 according to the embodiment of the present invention The fact that an abnormality has occurred in the communication system is transmitted to the interlocking device 12. That is to say, such a situation may cause abnormalities in the communication system, such as when the second modem 36 fails and cannot transmit, when the first modem 28 fails and cannot receive, or when the power line 18 is disconnected and communication becomes impossible. Is generated, and is transmitted to the interlocking device 12. In addition, the control processing unit 42 determines that the second modem 36 transmits the second information message a predetermined number of times in the second predetermined cycle because the reception of the first information message is interrupted. 36 does not receive the first information message, in other words, if the reception from the first modem 28 is interrupted for a while, the control of the switching circuit unit 40 is performed irrespective of the signal 14 being displayed. Then, the traffic light 14 is forcibly stopped and displayed, or the emergency cutoff unit 44 is controlled to forcibly turn off the traffic light 14.

  In other words, such a situation may occur in the communication system such as when the first modem 28 fails and cannot transmit, when the second modem 36 fails and cannot receive, or when the power line 18 is disconnected and communication becomes impossible. Occurs when is occurring. For this reason, the traffic signal 14 is stopped or turned off depending on whether or not the power line 18 is disconnected. Thereby, when an abnormality occurs in the communication system, the information can be promptly transmitted to the interlocking device 12 and the traffic light 14 can be promptly switched to the stop signal or the extinguishing light. Can be performed.

  In addition, the display control system 10 according to the embodiment of the present invention is configured such that the control processing unit 42 of the first information message repeatedly transmitted from the first modem 28 The first information message received three times is referred to. Then, the three pieces of notification information included in the three most recent first information telegrams include two or more pieces of notification information that are different from the current content of the traffic light 14 and have the same content. If it has been, the control processing unit 42 controls the switching circuit unit 40 in accordance with the contents of the present information, and changes the present contents of the traffic light 14. That is, the control processing unit 42 adopts these pieces of present information as new present information only when three or two pieces of present information in the three latest present information match each other, 14 is reflected. With this, even if the first information message including erroneous announcement information that has been suddenly changed due to the influence of noise or the like is mixed in the first information message repeatedly transmitted, such a case is possible. Since it is possible to eliminate the information without adopting the appropriate announcement information, it is possible to perform the announcement control with higher security.

  Note that the configuration shown in FIG. 1 is an example of the configuration of the present control system 10 according to the embodiment of the present invention, and does not limit the configuration of the present control system 10. For example, a part or the whole of the configuration of the interlocking device side control unit 24 may be incorporated in the interlocking device 12. FIG. 1 shows an example in which the traffic light 14 has three lamps G, Y, and R, which are signal bulbs having a double filament structure. The present invention is not limited to this configuration, and may have, for example, two lamps or four or more lamps, and each lamp may be of an LED type.

  Here, FIG. 5 shows a part of a conventional current control circuit using LED lamps R, Y, and G. As shown in FIG. 5A, the traffic light 102 is configured such that a current flows through any of the lamps R, Y, and G by the relay control in the relay unit 108, similarly to the traffic light 102 shown in FIG. , Display control is performed. Each of the lamps R, Y and G has a double arrangement as shown in FIG. 5 (b). Can be detected, and the use of LEDs contributes to power saving. It will be easily understood that the display control system 10 according to the embodiment of the present invention can also be applied to a configuration using such an LED lamp.

Further, the types of the indication of the traffic light 14 are not limited to the three indications of “stop”, “caution”, and “progress”, but may be six indications corresponding to the message configuration of FIG. 3 or other indications. There may be. In the case of a lighting circuit with four or more indications, an indication for lighting two lamps at the same time is included. Therefore, a voltage balancer for maintaining the voltage balance at the time of simultaneous lighting is provided. Voltage correction at the time of occurrence of wicking or total eccentricity is performed. Further, for the lighting circuits of four or more indications, one more power supply line is required from the signal lamp transformer, but illustration and description of these circuits are omitted.
Further, the power line 18 used in the display control system 10 according to the embodiment of the present invention may be newly laid or a part of a conventional multi-core cable may be used. When a plurality of traffic lights 14 are controlled by the interlocking device 12, the configuration shown in FIG. 1 is installed for each traffic light 14.

  10: display control system, 12: interlocking device, 14: traffic light, 18: power line, 20: common mode coil, 24: interlocking device side control unit, 26: message processing unit, 28: first modem, 34: traffic light Side control unit, 36: second modem, 40: switching circuit unit, 42: control processing unit, 44: emergency cutoff unit, 50: multiple sensors, CA: present data area, ca1 to ca6: multiple data areas , G, Y, R: Light bulb

Claims (12)

A system for performing a display control of a traffic light of a railway equipped with a plurality of light bulbs according to the display information output from the interlocking device,
A power line that is laid from the vicinity of the interlocking device to the traffic light and supplies power for lighting the plurality of lamps,
An interlocking device-side control unit installed near the interlocking device,
A signal-side control unit interposed between the traffic light and the power line in the vicinity of the traffic light,
The interlocking device-side control unit, the notification information is transmitted from the interlocking device, and a message processing unit that digitally encodes and creates at least a first informational message including the notification information, and the power line. A first modem coupled to the power line to transmit a first information message;
The signal side control unit, the second modem coupled to the power line to receive the first information message via the power line, the power supplied via the power line, the plurality of A switching circuit unit that performs switching so as to be supplied to at least one of the light bulbs; and the switching circuit unit based on the present information included in the first information message obtained from the second modem. And a control processing unit for controlling power supply to the plurality of light bulbs under the control of the control processing unit. Including a plurality of sensors for individually measuring the current flowing through the plurality of lamps,
The control processing unit is configured to generate, based on current values obtained from the plurality of sensors, security information relating to each of the plurality of lamps, and to digitally encode a second information message including at least the security information. Create
The second modem further has a function of transmitting the second information message via the power line, and the first modem has a function of receiving the second information message via the power line. Have more,
The present control according to claim 1, wherein the message processing unit transmits the security information included in the second information message acquired from the first modem to the interlocking device. system. The first information telegram and the second information telegram have the same telegram configuration including both the present information and the security information,
The message processing unit combines the present information transmitted from the interlocking device with the security information included in the second information message transmitted from the second modem to the first modem. To create the first information message,
The control processing unit is configured to generate based on the present information included in the first information message transmitted from the first modem to the second modem and a current value acquired from the plurality of sensors. The present control system according to claim 2, wherein the second information message is created by combining the security information with the security information.   The message processing unit and the control processing unit include a plurality of indications that can be given to the traffic light in an indication data area in which the indication information in the first information message or the second information message is reflected. A plurality of data areas corresponding to the types, a predetermined plurality of bits are secured for each of the plurality of data areas, and when the present information is reflected in the present data area, the plurality of data areas In the data area corresponding to the type of the presentation indicated by the presentation information, all of the predetermined plurality of bits are set to 1, and all of the predetermined plurality of bits in all the remaining data areas are set to 0. 4. The present control system according to claim 3, wherein: The message processing unit and the control processing unit, when creating the first information message or the second information message, to add a test code,
The message processing unit uses the test code included in the second information message acquired from the first modem to perform a cyclic redundancy check on the acquired second information message,
The control processing unit performs a cyclic redundancy check on the acquired first information message using the test code included in the first information message acquired from the second modem. The present control system according to claim 3 or 4. The first modem repeatedly transmits the first information message at a first predetermined cycle,
The second modem transmits the second information telegram as a response to the reception of the first information telegram, and if the first information telegram has not been received for a predetermined time, the second modem The present control system according to any one of claims 3 to 5, wherein the information telegram is repeatedly transmitted at a second predetermined cycle. When the first modem does not continuously detect the response from the second modem a predetermined number of times, the message processing unit informs the interlocking device that an abnormality has occurred in the communication system. And
The control processing unit is configured such that the second modem does not receive the first information message while the second modem transmits the second information message at a predetermined number of times in the second predetermined period. 7. The present control system according to claim 6, wherein the control circuit controls the switching circuit to stop the traffic light, or controls the emergency cutoff unit to turn off the traffic light. .   The control processing unit is different from the present content of the traffic light in the three pieces of the present information included in the first information message received three times most recently via the second modem, and When two or more pieces of presenting information having the same contents are included, the present invention controls the switching circuit unit according to the contents of the presenting information to change the presenting contents of the traffic light. 8. The present control system according to 6 or 7.   The present control system according to any one of claims 2 to 8, wherein the first modem and the second modem perform transmission and reception in a frequency band of 450 kHz or less.   10. The present control system according to claim 2, wherein the first modem and the second modem use frequency shift keying as a modulation scheme.   The present control system according to any one of claims 1 to 10, wherein the switching circuit unit is configured using a solid state relay.   The power line is a two-core cable for supplying AC power, and a common mode coil is provided between a position where the first modem is connected and a position where the second modem is connected. The present control system according to any one of claims 1 to 11, characterized in that:

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