JP2013109467A - Traffic signal control system and traffic signal controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a traffic signal control system capable of grasping a status such as a failure of a traffic signal controller on a central device without impairing advantages such as economical efficiency of a site-oriented traffic signal controller.SOLUTION: A traffic signal control system includes a central device 10 to execute traffic control, a site-oriented traffic signal controller 12 connected radio-communicably with the central device 10 and to execute a signal control usually independently from the central device 10. The traffic signal controller 12 includes a status information generating part 302 to generate status information on its own status, and a status information notifying part 303 to notify the central device 10 of the status information.

Description

  The present invention relates to a traffic signal control system and a traffic signal controller for controlling lighting or extinguishing of signal lamps installed at intersections of roads and the like.

At intersections and pedestrian crossings, traffic signal controllers are installed that control the lighting or extinguishing of signal lights such as blue, yellow, red, and blue arrows at predetermined time intervals.
This traffic signal controller has a “centralized type” and a “point type”. Of these, the centralized traffic signal controller communicates information with a central device installed in a traffic control center, etc., and controls signal lamps (hereinafter simply referred to as “signal control” based on instructions from the central device). ”). On the other hand, the point type traffic signal controller performs signal control independently without performing communication with the central device. The traffic signal controller is applied with either a centralized type or a point type control method in consideration of the traffic volume at the intersection where the signal lamp to be controlled is installed.

  Further, in Patent Document 1 below, in order to prevent an accident of a vehicle or a pedestrian caused by an earthquake shake or the like, the central device acquires an expected start time of the shake based on the received earthquake information, and the expected start of the shake is described below. A technique has been proposed in which instruction information according to time is transmitted to a centralized traffic signal controller, and the traffic signal controller performs control to turn all vehicle signal lamps red before the start time of shaking. ing.

JP 2010-79326 A

  The above-mentioned centralized traffic signal controller is connected to the central device via a public communication line or the like, and is periodically communicated with the central device. For this reason, the central device can centrally control a plurality of traffic signal controllers remotely, and when communication with the traffic signal controller is not properly performed due to a failure of the traffic signal controller or the communication line. It is possible to discover the existence of the defect at an early stage.

  However, since the point-type traffic signal controller does not communicate with the central device, discovery may be delayed when a malfunction such as a failure occurs. In addition, when a disaster such as an earthquake occurs, it cannot receive information from the central device like the centralized traffic signal controller described in Patent Document 1, and performs signal control according to the disaster. I couldn't.

  On the other hand, the centralized traffic signal controller increases the cost required for the installation and maintenance of the communication infrastructure with the central equipment, the communication cost, etc. This is advantageous in terms of economy.

  The present invention has been made in view of such circumstances, and does not impair the economics and the like in the point type (independent control type) traffic signal controller, and the state of the malfunction of the traffic signal controller. It is an object of the present invention to provide a traffic signal control system and a traffic signal controller capable of grasping a traffic signal on the central device side.

(1) A traffic signal control system according to the present invention includes a central device that performs traffic control, and a point-type traffic that is connected to the central device so as to be capable of wireless communication and that performs signal control independently of the central device in normal times. A signal controller,
The traffic signal controller includes a state information generation unit that generates state information related to its own state, and a state information notification unit that transmits the state information to the central device.

  According to the traffic signal control system of the present invention, since the traffic signal controller wirelessly transmits status information about its own state to the central device, the central device side can grasp the status of the traffic signal controller, When a problem occurs in the signal controller, it is possible to cope with it early. And since communication between the traffic signal controller and the central device is performed wirelessly, compared to the case where communication with the central device is performed by wire as in a centralized traffic signal controller, the communication infrastructure is installed and maintained. The cost required for this can be suppressed. Further, the traffic signal controller of the present invention is a point type that performs signal control independently from the central device, and communication with the central device is performed exclusively for transmission of its own status information. It can be reduced and there is almost no loss of economics, which is an advantage of the point type.

(2) The central device commands a transition to a disaster mode that is a control mode at the time of a disaster based on a disaster information acquisition unit that acquires information about a disaster and information on the occurrence of a disaster acquired by the disaster information acquisition unit A transition command notification unit that transmits disaster mode transition command information to the traffic signal controller,
The traffic signal controller may include a signal control unit that performs signal control in a disaster mode.

  According to this configuration, when a disaster such as an earthquake occurs, the central device acquires information on the occurrence of the disaster and transmits disaster mode transition command information to the traffic signal controller. And a traffic signal controller performs signal control by disaster mode based on received disaster mode transfer command information, for example. Therefore, the traffic signal controller can perform special signal control for preventing accidents and the like in a disaster mode different from the control mode in normal times.

(3) The transition command notification unit may have a function of transmitting, to the traffic signal controller, normal mode transition command information for commanding transition to a normal mode that is a control mode in normal times. The signal control unit may have a function of performing signal control in a normal mode based on normal mode transition command information received from the central device.
According to this configuration, for example, when signal control in the disaster mode becomes unnecessary due to the convergence of the disaster, the transition command notification unit transmits the normal mode transition command information to the traffic signal controller, and the traffic signal controller Can execute signal control in the normal mode based on the normal mode transition command information.

(4) An abnormality that determines that an abnormality has occurred in the traffic signal controller when the central device does not receive the state information at a time when the state information is expected to be received from the traffic signal controller. You may provide the determination part.
As described above, the traffic signal controller has a function of transmitting the state information related to its own state to the central device. However, if the central device cannot receive the state information, the traffic signal control is performed. It can be considered that there is a high possibility that a malfunction has occurred in the machine or the wireless communication device. When the central device configured as described above does not receive the state information at a time when it is expected to receive the state information from the traffic signal controller, the abnormality determination unit determines that an abnormality has occurred in the traffic signal controller. Therefore, the trouble of the traffic signal controller can be properly grasped, which can be used for early recovery. The “time” at which the status information is expected to be received may be a specific “time point” or a “time range” having a predetermined width.

(5) The central device includes a request information notification unit that transmits request information for requesting the traffic signal controller to transmit the state information,
The abnormality determination unit determines that an abnormality has occurred in the traffic signal controller when the state information is not received even after a predetermined time has elapsed since the request information notification unit transmitted the request information. Is preferred.
According to this configuration, the central device transmits request information for requesting the traffic signal controller to transmit the state information, and whether or not the state information is received within a predetermined time as a response to the request information. By determining, it is possible to easily determine whether or not the traffic signal controller is defective. The frequency with which the request information notification unit requests transmission of the status information is preferably, for example, once to several times a day. This is because it is not necessary to grasp the state of the traffic signal controller so frequently, and as the frequency increases, the communication amount increases and the communication cost increases.

(6) The state information notification unit periodically transmits the state information,
The abnormality determination unit preferably determines that an abnormality has occurred in the traffic signal controller when the central device does not receive the state information at a predetermined time.
In this way, when the traffic signal controller is configured to periodically transmit the status information, it is possible to grasp in advance the time when the status information is sent on the central device side. When the state information is not received, it can be determined that an abnormality has occurred in the traffic signal controller.

(7) The central device includes an abnormality determination unit that determines that an abnormality has occurred in the traffic signal controller when receiving state information indicating that there is an abnormality from the state information notification unit. Is preferred.
In this way, when the status information itself sent from the traffic signal controller indicates an abnormality of the traffic signal controller, the central device can quickly and easily determine the abnormality of the traffic signal controller from the contents of the status information. Can be determined.

(8) The central device may include a disaster area specifying unit that specifies a disaster area based on the position of the traffic signal controller that is determined to be abnormal.
When a disaster occurs, there is a high possibility that some abnormality will occur in the traffic signal controller in the surrounding area including the occurrence point. Therefore, for example, when a traffic signal controller that is determined to have an abnormality is concentrated in a certain area, by specifying that area as a disaster area, appropriate signal control according to the disaster can be performed. The traffic signal controller can be executed.

(9) The traffic signal controller has a second disaster information acquisition unit that acquires disaster information independently of the disaster information acquisition unit of the central device,
Even if the second disaster information acquisition unit acquires the disaster information, the signal control unit receives the disaster mode transition command information from the transition command notification unit, and then performs a disaster based on the disaster mode transition command information. It is preferable to execute signal control by mode.

  As described above, the central device can acquire disaster information by the disaster information acquisition unit and transmit the disaster mode transition command information to the traffic signal controller based on the disaster information. If a failure occurs in communication with the other traffic signal controller, the disaster mode transition command information may not be properly transmitted to the traffic signal controller. Therefore, the traffic signal controller configured as described above can include a second disaster information acquisition unit that acquires disaster information independently of the central device. At this time, if the communication between the central device and the traffic signal controller is appropriate, the traffic signal controller can appropriately receive the disaster mode transition command information from the central device. 2 Transition to the disaster mode based on the disaster mode transition command information obtained from the central device, not from the information acquired from the disaster information acquisition unit.

(10) On the other hand, when the second disaster information acquisition unit acquires the disaster information and does not receive the disaster mode transition command information from the transition command notification unit, the signal control unit performs signal control according to the disaster mode. It is preferable to execute by self-judgment.
As a result, when there is a failure in communication with the traffic signal controller with the central device, the traffic signal controller does not receive the disaster mode transition command information from the central device, but the second signal of its own. Based on the disaster information acquired from the disaster information acquisition unit, signal control in the disaster mode can be executed by self-judgment.

  (11) The traffic signal controller of the present invention is a point-type traffic signal controller that performs signal control independently of a central device that performs traffic control, and is capable of wireless communication with the central device, A state information generation unit that generates state information regarding the state, and a state information notification unit that wirelessly transmits the state information to the central device are provided.

  ADVANTAGE OF THE INVENTION According to this invention, the state of the said traffic signal controller can be grasped | ascertained appropriately in the central apparatus side, without impairing the advantages, such as economical efficiency in a point type (independent control type) traffic signal controller.

It is the schematic which shows the structural example of the traffic signal control system which concerns on embodiment of this invention. It is a block diagram which shows the structural example of a central apparatus. It is a block diagram which shows the structural example of a traffic signal control machine (parent machine). It is a block diagram which shows the structural example of a traffic signal controller (slave machine). It is a schematic plan view of the road where the point type traffic signal controller was installed. It is a schematic plan view of the road where the centralized traffic signal controller was installed. It is a flowchart which shows the procedure of the operation state confirmation process of a traffic signal controller. It is a flowchart which shows the procedure of the disaster mode transfer process between a central apparatus and a traffic signal controller. It is a flowchart which shows the procedure of the transfer process of disaster mode (1st signal control). It is a flowchart which shows the procedure of the transfer confirmation process of disaster mode (1st signal control). It is a flowchart which shows the procedure of the transfer process of disaster mode (2nd signal control). It is a flowchart which shows the procedure of the transfer process of disaster mode (2nd signal control). It is a flowchart which shows the procedure of the completion | finish process of disaster mode (2nd signal control). It is a flowchart which shows the procedure of the operation state confirmation process of the traffic signal controller in a modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Outline of traffic signal control system]
FIG. 1 is a schematic diagram showing the overall configuration of a traffic signal system according to an embodiment of the present invention. FIG. 5 is a schematic plan view of a road where a point-type traffic signal controller is installed, and FIG. 6 is a schematic plan view of a road where a centralized traffic signal controller is installed. 5 and 6 illustrate an intersection where a main road (trunk line) RM with a large traffic volume and a driven road (non-trunk line) RS with a small traffic volume merge.

  The traffic signal system according to the present invention includes a central device 10 installed at a traffic control center or a sub-center below it, a signal color control of a signal lamp installed at an intersection of a road R (RM, RS), and other external devices. And traffic signal controllers 11 and 12 for controlling the apparatus (see FIGS. 5 and 6). The traffic signal controllers 11 and 12 of the present embodiment are a “centralized” traffic signal controller 11 that performs signal control based on a command from the central device 10, and performs signal control independently of the central device 10. And a traffic signal controller 12 of “point type” (“independent control type”). The centralized traffic signal controller 11 is disposed in a centralized control area A1 that is system-controlled or wide-area controlled by the central device 10. On the other hand, the point-type traffic signal controller 12 is arranged in another area (independent control area) A2 different from the central control area A1, and performs signal control independently of the central device 10 in normal times. It is configured.

  The collective traffic signal controller 11 constitutes a LAN (Local Area Network) via a central device 10 and a router 13 by a wired communication line. Further, the centralized traffic signal controller 11 constitutes a central device 10 and a LAN also by a wireless communication line. On the other hand, the point type traffic signal controller 12 forms a LAN with the central apparatus 10 by a wireless communication line. The traffic signal controllers 11 and 12 in the central control area A1 and the independent control area A2 are bidirectional with the other traffic signal controllers 11 and 12 in the same area A1 and A2 by a wired LAN and / or a wireless LAN, respectively. Communication is possible.

  In addition, the traffic signal controllers 11 and 12 arranged in the areas A1 and A2 respectively include one master unit (main controller) 11a and 12a (indicated by a circle with hatching in FIG. 1) and other slave units ( Sub-control units) 11b and 12b (indicated by white circles in FIG. 1). When a disaster occurs, the master units 11a and 12a execute predetermined signal control corresponding to the disaster (signal control in the disaster mode) and send a predetermined command to the slave units 11b and 12b. , 12b are configured to execute predetermined signal control corresponding to a disaster in the same manner as the master units 11a, 12a based on the command. Examples of disasters include those based on natural disasters such as earthquakes, typhoons, and thunderstorms, and those based on human disasters such as fires caused by misfires. In this embodiment, traffic signal controllers are used when an earthquake occurs as an example. 11 and 12 are configured to execute predetermined signal control.

  In addition, the traffic signal controllers 11 and 12 in the central control area A1 and the independent control area A2 transmit and receive specific information to and from the central apparatus 10 using wireless communication lines. In the present embodiment, transmission / reception of “operation information” indicating the operation state of the traffic signal controllers 11 and 12 and “request information” for requesting the operation information is performed as specific information using a wireless communication line.

Next, each configuration of the traffic signal control system will be described in detail.
[Configuration of central unit]
FIG. 2 is a block diagram illustrating a configuration example of the central apparatus 10.
The central apparatus 10 includes a control unit 20, a storage unit 21, an operation unit 22, a display unit 23, and communication units (wired and wireless) 24 and 25. In this specification, the control unit 20 of the central device 10 is referred to as a “central control unit” and the central device 10 in order to distinguish from the control unit 30 and the communication units 38 and 39 of the traffic signal controllers 11 and 12 described later. The communication units 24 and 25 may be referred to as “central communication unit”.

The central control unit 20 includes a workstation, a personal computer, and the like, and collectively collects, processes (calculates) and records various traffic information from the traffic signal controller 11 and the like, controls signals, and provides information. The central control unit 20 is connected to each hardware unit via an internal bus, and also controls the operation of each unit.
The central control unit 20 controls the traffic signal controller 11 in the centralized control area A1 by system control for adjusting the traffic signal controller 11 group on the same road, or wide-area control by extending this system control to the road network ( A signal control unit 201 that performs (surface control) and the like is provided. Further, the signal control unit 201 can perform traffic sensitive control that sets signal control parameters (split, cycle length, offset, etc.) according to traffic conditions.

In addition to the signal control unit 201, the central control unit 20 has a request information notification unit 202, an abnormality determination unit 203, an earthquake information acquisition unit 204, a control mode transition command notification unit 205, a disaster area identification unit as its functional configuration. 206 and the like.
The request information notification unit 202 notifies the traffic signal controllers 11 and 12 of information for requesting transmission of predetermined information (operation information) via a wireless communication line. The traffic signal controllers 11 and 12 determine their operating state based on the request information transmitted by the request information notifying unit 202, and transmit the operating state information to the central apparatus 10 via the wireless communication line.

The abnormality determination unit 203 uses the operation information transmitted from the traffic signal controllers 11 and 12 and the communication status (communication availability or the like) with the traffic signal controllers 11 and 12 as a determination material. And whether or not the communication line is abnormal.
The earthquake information acquisition unit (disaster information acquisition unit) 204 has a function of acquiring information related to an earthquake provided from the outside, such as an emergency earthquake bulletin provided by the Japan Meteorological Agency.

  Based on the earthquake information acquired by the earthquake information acquisition unit 204, the control mode transition command notification unit 205 instructs the traffic signal controllers 11 and 12 to execute signal control in the disaster mode (disaster mode transition command ) And a function for transmitting a command (normal mode transition command) for canceling the disaster mode and executing signal control in the normal control mode (normal mode). The notification of the control mode transition command is transmitted to the traffic signal controllers 11 and 12 in the central control area A1 and the independent control area A2 using a wireless communication line. The centralized traffic signal controller 11 may be notified of a control mode transition command using a wired communication line. In the present embodiment, the disaster mode includes two signal controls (first and second signal controls), and the disaster mode transition command transmitted by the control mode transition command notification unit 205 of the central device 10 is: It is a command to execute the second signal control.

The disaster area specifying unit 206 specifies a disaster area such as an earthquake from the positions of the traffic signal controllers 11 and 12 determined to be abnormal by the abnormality determining unit 203. When an earthquake occurs, there is a high possibility that a failure or the like will occur in the plurality of traffic signal controllers 11 and 12 arranged around the occurrence point. Therefore, the disaster area identifying unit 206 determines the traffic signal determined to be abnormal. An area where the controllers 11 and 12 are concentrated is identified as a disaster area.
Each functional configuration of the central control unit 20 in the central device 10 described above will be described later in detail together with processing procedures (see FIGS. 7 to 13) in the central device 10 and the traffic signal controllers 11 and 12.

  The wired communication unit 24 of the central device 10 is a communication interface connected to the wired communication unit 38 (see FIGS. 3 and 4) of the traffic signal controller 11 in the central control area A1 through a public communication line or the like. It is mainly used to transmit traffic information including a signal control command relating to the timing of switching the color of the signal lamp every predetermined time, road link travel time, traffic jam information and the like to each traffic signal controller 11.

  The wireless communication unit 25 of the central device 10 is a communication interface connected to the wireless communication unit 39 of the traffic signal controllers 11 and 12 in the central control area A1 and the independent control area A2, and from the traffic signal controllers 11 and 12 It is used for receiving transmitted operation information or requesting operation information from the central apparatus 10 to the traffic signal controllers 11 and 12. Further, when a disaster occurs, it is also used for transmitting a command from the control mode transition command notifying unit 205 of the central apparatus 10.

  The display unit 23 of the central device 10 is configured by, for example, a display screen on which a road map in the central control area A1 and positions of roadside sensors such as all signal lamps and vehicle detectors on the road map are displayed. Inform the central operator of traffic conditions such as traffic jams and accidents. The display unit 23 can also display a road map or the like in the independent control area A2. Then, the display unit 23 displays the positions of the traffic signal controllers 11 and 12 that are determined to be abnormal due to a failure such as communication failure or failure with respect to the road map or the like in the central control area A1 and the independent control area A2. In addition to displaying, it has a function of displaying a disaster area identified as having a disaster such as an earthquake.

The operation unit 22 of the central apparatus 10 includes an input interface such as a keyboard and a mouse. The operation unit 22 allows the central operator to perform a display switching operation on the display unit 23.
The storage unit 21 of the central device 10 includes an HDD, a semiconductor memory, and the like, and stores a control program for traffic sensitivity control, a traffic index calculation program used for the traffic sensitivity control, and the like. The storage unit 21 also has a temporary storage area for signal control commands and traffic information generated by the central control unit 20.

[Configuration of traffic signal]
As shown in FIG. 5 and FIG. 6, the traffic signal arranged at the intersection of the central control area A1 and the independent control area A2 includes a plurality of signal lamps 41 installed on the main road RM and the sub road RS, Traffic signal controllers 11 and 12 connected to the signal lamp 41 via a communication line are provided. The signal lamp 41 includes a vehicular lamp and a pedestrian lamp. Further, in the present embodiment, as shown in FIG. 6, roads RM, RS and intersections thereof in the central control area A1, such as a traffic information board 43, an optical beacon 44, a wireless device 45, a vehicle detector 42, etc. External devices are provided, and the traffic signal controllers 11 and 12 provide information and the like via these external devices. On the other hand, as shown in FIG. 5, the roads RM, RS and their intersections in the independent control area A2 are smaller in size and traffic than the roads RM, RS and intersections in the central control area A1. ing. Therefore, the traffic information board 43, the optical beacon 44, and the wireless device 45 other than the vehicle detector 42 are not installed in the independent control area A2.

  FIG. 3 is a block diagram showing the configuration of the master units 11 a and 12 a of the traffic signal controllers 11 and 12. In the following description, “the master unit 11a, 12a of the traffic signal controller 11, 12” is simply referred to as “traffic signal controller 11a, 12a” or “traffic signal controller (master unit) 11a, 12a”. And “traffic signal controllers 11 and 12 of the traffic signal controllers 11 and 12” are simply referred to as “traffic signal controllers 11b and 12b” or “traffic signal controllers (slave devices) 11b and 12b. May be written.

The base units 11a and 12a of the traffic signal controllers 11 and 12 include a control unit 30, a lamp drive unit 31, a wired communication unit 38, a wireless communication unit 39, a storage unit 37, an earthquake detector 36, and various interface units 32-35. Etc.
The control unit 30 of the master units 11a and 12a is composed of one or a plurality of microcomputers and is connected to other units via an internal bus to control these operations. In addition, the control unit 30 operates with a signal control unit (main signal control unit) 301 that controls the signal lamp 41 and an operation status (status information) related to presence / absence of an abnormality or a failure by determining its own operation status. An information generation unit (state information generation unit) 302, an operation information notification unit (state information notification unit) 303 that transmits the operation information to the central apparatus 10 via the wireless communication unit 39, and the earthquake detector 36 detect the operation information. Information relating to an earthquake and an earthquake information acquisition unit (disaster information acquisition unit) 304 to be acquired, a control mode transition command notification unit 305 for notifying the slave units 11b and 12b of the traffic signal controllers 11 and 12 of a control mode transition command, It is equipped with.

  The function of the signal control unit 301 differs between the point-type traffic signal controller 12a and the centralized traffic signal controller 11a. In the case of the point type traffic signal controller 12a, the signal control unit 301 turns on / off the blue, yellow, red, and right turn arrows of the signal lamp 41 based on the signal display information stored in the storage unit 37. , And a signal such as blinking are output to the lamp drive unit 31. It should be noted that the lamp color switching timing indicated by the signal display information is changed by sensitive control in which the vehicle detector 42 senses traffic conditions on a road such as an intersection.

  On the other hand, the signal control unit 301 of the centralized traffic signal controller 11 a sends a signal of switching timing such as turning on or off of the signal lamp 41 based on the signal control parameter transmitted from the central device 10. It has a function to output to. Similarly to the point type, the signal control unit 301 of the centralized traffic signal controller 11a autonomously generates a signal control parameter based on the sensing signal acquired by the vehicle detector 42, and the generated signal control parameter. It is also possible to perform terminal sensitive control that performs signal control based on the above.

  Further, the signal control unit 301 of the centralized and point-type traffic signal controllers 11a and 12a is not only a control mode (normal mode) for signal control in normal times as described above, but also a control mode at the time of disaster. “Disaster mode” can be executed. In this embodiment, the disaster mode is set to detect an earthquake as a disaster and perform signal control adapted to the occurrence of this earthquake.

  The wired communication unit 38 in the centralized traffic signal controller 11a is connected to the wired communication unit 24 of the central apparatus 10 and the wired communication unit 38 of another traffic signal controller (slave unit) 11b via a wired communication line. Yes. The wireless communication unit 39 in the centralized traffic signal controller 11a is connected to the wireless communication unit 25 of the central device 10 and the wireless communication unit 39 of another traffic signal controller (slave unit) 11b via a wireless communication line. Has been.

  On the other hand, the wired communication unit 38 in the point-type traffic signal controller 12a is not connected to the wired communication unit 24 of the central device 10, but is connected to the wired communication unit 38 of another traffic signal controller (slave unit) 12b. It is connected. In addition, the wireless communication unit 39 in the point type traffic signal controller 12a is connected to the wireless communication unit 25 of the central device 10 and the wireless communication unit 39 of another traffic signal controller (slave unit) 12b via a wireless communication line. Has been.

  A traffic information board 43, an optical beacon 44, an ITS wireless device 45, and a vehicle detector 42 (see also FIG. 6) are connected to the various interface units 32 to 35 of the centralized traffic signal controller 11a. On the other hand, as shown in FIG. 5, a traffic information board 43 other than the vehicle sensor 42, an optical beacon 44, and an ITS wireless device 45 are located at roads RM, RS and intersections where the point-type traffic signal controller 12 a is installed. Are not installed, these devices are not connected to the interface units 32 to 34 of the traffic signal controller 12. Therefore, in the point type traffic signal controller 12a, these interface units 32-34 can be omitted.

  For details on the operation of the operation information generation unit 302, the operation information notification unit 303, the earthquake information acquisition unit 304, and the control mode transition command notification unit 305 in the control unit 30 of the traffic signal controllers 11a and 12a and the disaster mode, refer to The processing procedure in the apparatus 10 and the traffic signal controllers 11a and 12a (see FIGS. 7 to 13) will be described later in detail.

  FIG. 4 is a block diagram showing the configuration of the slave units 11b and 12b of the traffic signal controllers 11 and 12. The slave units 11b and 12b of the traffic signal controllers 11 and 12 do not include the earthquake information acquisition unit 304 and the control mode transition command notification unit 305 and the earthquake detector 36 in the control unit 30 of the master units 11a and 12a. The other configurations are the same as those of the master units 11a and 12a, and in particular, perform the same operations as the master units 11a and 12a in normal times. Further, when an earthquake occurs, the signal control unit 301 of the slave units 11b and 12b operates based on a control mode transition command transmitted from the central device 10 or the master units 11a and 12a.

[Traffic signal controller operating status confirmation process]
Next, with reference to FIG. 7, the procedure of the process for the central apparatus 10 to confirm the operating state of the traffic signal controllers 11 and 12 will be described. In this process, communication between the traffic signal controllers 11 and 12 and the central device 10 is performed via a wireless communication line.
First, the central apparatus 10 transmits information (request information) indicating that transmission of operation information is requested to the traffic signal controllers 11 and 12 (step S1). The transmission of the request information is periodically executed at a predetermined time or an arbitrary time, for example, once to several times a day.

The traffic signal controllers 11 and 12 determine whether or not the request information has been received from the central device 10 (step S101). If the request information is received, the process proceeds to step S102. Repeats the process of step S101.
In step S102, the traffic signal controllers 11 and 12 determine their own operating state and transmit information indicating the operating state to the central apparatus 10 (step S103).

The central device 10 determines whether or not the operation information has been received from the traffic signal controllers 11 and 12 (step S2). If the operation information is received, the process proceeds to step S3. Advances the process to step S6.
In step S3, the central apparatus 10 confirms the contents of the received operation information and determines whether or not the traffic signal controllers 11 and 12 are normal. When the content of the operation information indicates that the traffic signal controllers 11 and 12 are normal, the normal signal control can be continuously executed, and thus the operation state confirmation process is terminated.

  On the other hand, in step S6, the central device 10 determines whether or not a predetermined time has elapsed since the request information was transmitted to the traffic signal controllers 11 and 12. If the predetermined time has not elapsed, the presence / absence of operation information is confirmed again in step S2. If the predetermined time has elapsed, the process proceeds to step S7.

  In step S <b> 7, the central apparatus 10 transmits request information to the traffic signal controllers 11 and 12 again. If the operation information is not received after a predetermined time has passed in spite of the transmission of the request information in step S1, a case such as a failure such as a failure has occurred in the traffic signal controllers 11, 12 There may be cases where operation information cannot be received due to temporary factors (temporary communication failure, shielding, etc.). For this reason, in step S7, the request information is transmitted again in order to confirm in which case the cause of the failure to receive the operation information.

  The traffic signal controllers 11 and 12 determine whether or not there is a re-request from the central device 10 (step S104), and when there is a re-request, the operation information is transmitted again (step S105). The central device 10 determines whether or not the operation information has been received (step S8). If the operation information has been received, the central device 10 proceeds to step S3 and determines the traffic signal controllers 11 and 12 from the contents of the operation information. It is determined whether or not is normal. On the other hand, if it is determined in step S8 that operation information has not been received, the process proceeds to step S4.

  If the central device 10 determines in step S3 that the traffic signal controllers 11 and 12 are not normal, or if it is determined in step S8 that the central device 10 has not received operating information, the traffic in step S4 It is determined that an abnormality has occurred in the signal controllers 11 and 12. Thereafter, in step S5, the central device 10 automatically or manually communicates to the maintenance department and related departments such as the police station having jurisdiction that the traffic signal controllers 11 and 12 are abnormal. Run through.

  As described above, in the present embodiment, the central device 10 periodically requests operation information transmission, and the traffic signal controllers 11 and 12 transmit the operation information to the central device 10 accordingly. The device 10 can reliably grasp the operating state of the traffic signal controllers 11 and 12. In particular, the conventional point-type traffic signal controller does not communicate with the central device for signal control, so even if an abnormality occurs in the traffic signal controller, the central device recognizes the abnormality. However, in this embodiment, even if it is a point-type traffic signal controller 12, the central device 10 can reliably grasp the occurrence of an abnormality. In addition, when an abnormality has occurred, early recovery can be realized by contacting relevant departments.

  In addition, since the communication for confirming the operation state of the traffic signal controllers 11 and 12 as described above is performed via a wireless communication line, in particular, the communication between the point-type traffic signal controller 12 and the central device 10 is performed. Therefore, compared with the case where a wired communication line is used, the cost required for installing and maintaining the communication infrastructure can be reduced. In addition, since communication between the point-type traffic signal controller 12 and the central device 10 is only transmission / reception of request information and operation information about once to several times a day, and communication at the time of disaster described later, The amount of communication is also very small. Therefore, the communication cost can be suppressed, and the economic efficiency that is an advantage of the point type traffic signal controller 12 is not impaired.

[Disaster mode transition process]
Next, processing for causing the traffic signal controllers 11 and 12 to execute signal control in the disaster mode will be described with reference to FIGS.
FIG. 8 is a flowchart showing the overall procedure of the disaster mode transition process in the central device 10 and the traffic signal controllers (parent device, slave device) 11, 12.
In FIG. 8, step S1001 is a process for shifting the traffic signal controllers 11 and 12 to the disaster mode (first signal control) based on the occurrence of an earthquake. This processing is performed between the parent devices 11a and 12a and the child devices 11b and 12b in the traffic signal controllers 11 and 12, and the central device 10 is not directly involved.

  As described above, in the present embodiment, the first signal control and the second signal control are included as the disaster mode. The first signal control is a signal control that requires immediate execution immediately after the occurrence of the earthquake. For this reason, the first signal control is performed based on the judgment of the traffic signal controllers 11 and 12 without receiving an instruction from the central device 10. Control. In the first signal control of the present embodiment, control is performed to change the color of all signal lamps in the corresponding areas A1 and A2 to red lighting. The second signal control is signal control for prompting the vehicle or pedestrian to evacuate after the earthquake has stopped. The first signal control and the second signal control will be described later together with detailed processing procedures.

Next, step S1002 is a process for the central apparatus 10 to confirm that the traffic signal controllers 11 and 12 have shifted to the disaster mode (first signal control). This process is executed between the traffic signal controllers 11 and 12 and the central device 10.
Next, step S1003 is a process for shifting the traffic signal controllers 11 and 12 to the disaster mode (second signal control). Unlike the process of step S1001, this process is executed with not only the traffic signal controllers 11 and 12 but also the central device 10 directly involved.

Next, step S1004 is a process for ending the signal control in the disaster mode. This processing is also executed by directly involving the central device 10 as well as the traffic signal controllers 11 and 12.
Details of each process will be described below.

FIG. 9 is a flowchart showing the procedure of the transition process in the disaster mode (first signal control).
The base units 11a and 12a of the traffic signal controllers 11 and 12 (hereinafter simply referred to as “traffic signal controllers 11a and 12a”) receive earthquake information from the seismic detector 36 provided in the traffic signal controllers 11 and 12 as shown in FIG. The earthquake information acquisition unit 304 that acquires the information and the control mode transition command notification unit 305 that notifies the slave units 11b and 12b of the transition command to the disaster mode based on the own information acquired by the earthquake information acquisition unit 304. ing. On the other hand, when an earthquake occurs, a P wave (Primary Wave) first arrives, and then an S wave (Secondary Wave) that is the main motion arrives. Therefore, when the earthquake occurs, the base units 11a and 12a of the traffic signal controllers 11 and 12 acquire information indicating that the P wave is detected from the earthquake detector 36 in step S111 of FIG.

  In step S112, the parent devices 11a and 12a transmit “first notification” that is disaster mode transition command information to the child devices 11b and 12b. Thereafter, the base units 11a and 12a perform signal control (first signal control) in the disaster mode in Step S113.

The slave units 11b and 12b determine whether or not the first notification has been received in step S211, and if the notification is received, proceed to step S212, and if not received, perform the processing. Return to step S211.
And the subunit | mobile_unit 11b, 12b performs signal control (1st signal control) by disaster mode in step S212.

  In this way, the master units 11a and 12a themselves shift to the disaster mode and notify the slave units 11b and 12b in the same area A1 and A2 that the slave units 11b and 12b shift to the disaster mode. By shifting to the disaster mode, signal control based on the disaster mode controlled in the entire area A1, A2 can be executed.

  In step S113 and step S212, the first signal control executed by the master units 11a and 12a and the slave units 11b and 12b is control for changing all the lamp colors of the signal lamp 41 to be controlled to red. Such control is performed for the following reason. In other words, when the P wave is detected, there is a high possibility that the S wave will subsequently reach and a large shake will occur. Therefore, when the P wave is detected, the lights of all the signal lamps are made red so that the vehicle or pedestrian This is because traffic can be stopped and damage when the S-wave reaches, for example, accidents such as collisions between traveling vehicles and contact between vehicles and pedestrians can be minimized. In addition, since it is desired that such control be executed as soon as possible after the P wave is detected, the control is executed by the traffic signal controllers (master devices) 11a and 12a without using the central device 10. .

  Note that when the first signal control is executed, the signal lamp that is already lit in the red lamp color may continue as it is, but the signal lamp whose lamp color is blue or yellow suddenly turns red. If it is changed to, the running vehicle may be confused and an accident may be induced. Therefore, in the present embodiment, control for changing to red lighting is performed in the following steps.

  Specifically, when the vehicular signal lamp is lit with a blue light color when the first signal control is executed, the light color is changed stepwise in the order of “blue → yellow → red”. Further, the lighting time of each lamp color is changed to the red lamp color as soon as possible by setting the preset minimum display seconds (for example, 3 to 6 seconds). Similarly, when the vehicular signal lamp is lit with a yellow lamp color when the first signal control is executed, the lamp color is changed from “yellow to red” in the minimum display seconds.

Further, when the pedestrian signal lamp is lit in the blue light color at the time when the first signal control is executed, the pedestrian signal lamp is gradually changed to “flashing blue → lights red” in the minimum display seconds. Similarly, when the pedestrian signal lamp is blinking in a blue light color at the time of executing the first signal control, the pedestrian signal lamp is changed to “red lighting” in the minimum display seconds.
In the signal control in the normal mode, first, the light color of the pedestrian signal light device is changed stepwise from blue to red, and then the light color of the vehicle signal light device is changed stepwise from blue to red. In this case, the signal color of the vehicle signal lamp and the pedestrian signal lamp is quickly changed to red in the case of signal control in the disaster mode. Each of them is controlled independently.

FIG. 10 is a flowchart illustrating the procedure of the transition confirmation process in the disaster mode (first signal control).
As described above, when the traffic signal controllers 11 and 12 execute the first signal control in the disaster mode, as shown in step S1002 of FIG. 8, the central apparatus 10 confirms the transition to the disaster mode. That is, a process of notifying the central device 10 that the traffic signal controllers 11 and 12 have shifted to the disaster mode is executed.

Specifically, as shown in FIG. 10, the traffic signal controllers 11 and 12 notify that the master units 11a and 12a and the slave units 11b and 12b have transitioned to the disaster mode in step S121 (disaster mode transition). Send notification) to the central device 10.
In step S21, the central device 10 determines whether or not a disaster mode transition notification has been received. If the central device 10 receives the notification, the central apparatus 10 proceeds to step S22 to confirm that the disaster mode transition notification has been received. Information is transmitted to the traffic signal controllers 11 and 12. Thereafter, in step 23, the central device 10 automatically or manually notifies the related department that the traffic signal controllers 11 and 12 have shifted to the disaster mode, and ends the processing.
Through the above processing, even when the traffic signal controller 11 or 12 side makes a transition to the disaster mode without asking for instructions from the central device 10, the central device 10 can recognize that fact. .

  On the other hand, the traffic signal controllers 11 and 12 determine whether or not the confirmation information is received in step S122. If the confirmation information is received, the process is terminated. If the confirmation information is not received, In step S123, it is determined whether or not a predetermined time has elapsed since the notification of the transition to the disaster mode has been transmitted. The traffic signal controllers 11 and 12 retransmit the disaster mode transition notification when the predetermined time has not elapsed (step S121), and a communication error has occurred when the predetermined time has elapsed. Determination is made (step S124), and the process is terminated.

  The central device 10 can independently acquire information indicating that an earthquake has occurred by the earthquake information acquisition unit 204 (see FIG. 2) (step S11 in FIG. 8). If it is determined that it has not been received, it is determined whether or not a predetermined time has elapsed since the earthquake information was independently acquired (step S24). If the predetermined time has not elapsed, the process proceeds to step S21. When the process is returned and the predetermined time has elapsed, the traffic signal controllers 11 and 12 notify the related department that the traffic signal controllers 11 and 12 have not shifted to the disaster mode (step S23).

11 and 12 are flowcharts showing the procedure of the transition process in the disaster mode (second signal control).
As described above, when the central apparatus 10 confirms the transition to the disaster mode (first signal control) by the traffic signal controllers 11 and 12 (step S1002 in FIG. 8), the disaster mode “second signal” Processing for shifting to “control” is performed (step S1003 in FIG. 8).
Specifically, as shown in FIG. 11, information indicating that the central device 10 and the master units 11 a and 12 a of the traffic signal controllers 11 and 12 have detected S waves by the earthquake information acquisition units 204 and 304, respectively. Is determined (step S31, S131).

  And the central apparatus 10 advances a process to step S32, when the earthquake information acquisition part 204 acquires the earthquake information that the S wave was detected, and advances a process to step S34, when not acquiring. On the other hand, if the base units 11a and 12a of the traffic signal controllers 11 and 12 have acquired the earthquake information indicating that the S wave has been detected, the process proceeds to step S132. Proceed with the process.

Base units 11a and 12a perform control for continuing the first signal control in step S132. That is, the state where all the lamp colors of the signal lamp 41 are red is continued. Further, the slave units 11b and 12b do not receive any instruction from the central device 10 and the master units 11a and 12a at this stage, and continue to execute the first signal control (step S231).
In step S32, the central apparatus 10 determines whether or not the earthquake information acquisition unit 204 has acquired the earthquake information indicating that the S wave has ended. If the earthquake information is acquired, the central apparatus 10 performs the process in step S33. If it has not been acquired, the process returns to step S32. In addition, in Step S133, the base units 11a and 12a determine whether or not the earthquake information indicating that the S wave has ended is acquired from the earthquake detector 36, and if the earthquake information is acquired, Step S135 ( If the process is not acquired, the process returns to step S132.

  If the central device 10 has not acquired the earthquake information indicating that the S wave has been detected in step S31, the central device 10 acquires the earthquake information about the P wave in step S34 (step S11 in FIG. 8), and then for a predetermined time. If the predetermined time has not elapsed, the process returns to step S31. If the predetermined time has elapsed, the process proceeds to step S33.

  In addition, when the base units 11a and 12a have not acquired the earthquake information indicating that the S wave has been detected in step S131, the base unit 11a and 12a acquire the earthquake information about the P wave in step S134 (step S111 in FIG. 9). If the predetermined time has not elapsed, the process returns to step S131. If the predetermined time has elapsed, the process proceeds to step S135 (see FIG. 12). To proceed.

  In step S33, the central device 10 notifies the parent device 11a, 12a and the child device 11b, 12b of the traffic signal controller 11, 12 of transition command information for executing the second signal control in the disaster mode. . On the other hand, the master units 11a and 12a and the slave units 11b and 12b of the traffic signal controllers 11 and 12 determine whether or not disaster mode transition command information has been received from the central apparatus 10 in steps S135 and S232 of FIG. .

When the master units 11a and 12a and the slave units 11b and 12b receive the disaster mode transition command information, the process proceeds to steps S136 and S233, and the second signal control is executed. That is, the disaster mode (second signal control) is executed based on an instruction from the central apparatus 10.
On the other hand, if it is determined in step S135 that the disaster mode transition command information has not been received, base unit 11a, 12a proceeds to step S137, and a predetermined time has elapsed since it acquired earthquake information. If the predetermined time has not elapsed, the process returns to step S135, and if the predetermined time has elapsed, the process proceeds to step S138.

  In step S138, the parent devices 11a and 12a perform “second notification” to the child devices 11b and 12b. This second notification is the transition command notification information to the second signal control in the disaster mode, and the master units 11a and 12a execute the second signal control by themselves after performing the second notification. (Step S136). The subunit | mobile_unit 11b, 12b judges whether the 2nd notification was received in step S234, and when the said notification is received, performs 2nd signal control (step S233).

  As described above, when an earthquake occurs, a failure may occur in communication between the traffic signal controllers 11 and 12 and the central device 10, and the disaster mode transition command information transmitted from the central device 10 due to the failure is transferred to the traffic. There may be a case where the signal controllers 11 and 12 cannot receive properly. Therefore, in this embodiment, when the traffic signal controllers 11 and 12 do not receive the disaster mode transition command information from the central device 10, the master units 11a and 12a assume that the failure has occurred, Executes the signal control by the second signal control in the disaster mode by self-judgment based on the earthquake information acquired by the slave unit, and the slave units 11b and 12b depend on the disaster mode based on the second notification from the master units 11a and 12a. The second signal control is executed. Thereby, the signal control in the disaster mode can be advanced without depending on the instruction from the central device 10.

  The second signal control in the disaster mode is control performed when the detection of the S wave is completed or when the S wave is not detected even after a predetermined time has elapsed after the detection of the P wave. This second signal control is a signal control for quickly flowing out the vehicle etc. from the disaster occurrence point after the shaking of the earthquake is stopped and preventing the inflow of the vehicle etc. to the disaster point. Damages from disasters can be minimized. That is, the second signal control is a signal control exclusively for prompting evacuation from the disaster area. The following control can be executed as the second signal control.

For example, the light color of the signal lamp 41 on the main road RM side can be continuously lit blue or blinking yellow, and the color of the signal lamp 41 on the side of the secondary road RS can be lit red or blinking red. By performing such signal control, the main road RM can be actively used to promote smooth movement of the vehicle (evacuation from the disaster area).
Further, the signal color of the signal lamp 41 in the direction toward the disaster occurrence point or the like can be turned on in red, and the signal color of the signal lamp 41 in the direction away from the disaster occurrence point or the like can be turned on in blue. By performing such signal control, inflow of vehicles or the like to the disaster occurrence point or the like can be prevented, and outflow can be promoted.

  Further, the signal color of the signal lamp 41 in the direction of flowing into the highway can be made red, and the color of the signal lamp 41 in the direction of flowing out of the highway can be made blue. By performing such signal control, entry into the highway can be restricted and the vehicle can be preferentially discharged from the highway.

The above second signal control can be performed optimally according to the place where the traffic signal controllers 11 and 12 are installed, and is not limited to the above.
In the disaster mode (first and second signal control), not only the control of the signal lamp 41 but also the earthquake occurrence information, the evacuation route, etc. via the traffic information board 43, the optical beacon 44, and the ITS wireless device 45. It is possible to notify a traveling vehicle or the like, and evacuation from the disaster area can be further promoted.

FIG. 13 is a flowchart illustrating a procedure of end processing of the disaster mode (second signal control).
As described above, when the traffic signal controllers 11 and 12 shift to the disaster mode (second signal control) and then the disaster converges, processing for ending the disaster mode (second signal control) is performed. (Step S1004 in FIG. 8). Specifically, as shown in FIG. 13, the central device 10 and the parent devices 11a and 12a determine whether or not the disaster mode end condition is satisfied in steps S41 and S141. The termination condition is, for example, a case where a predetermined time has elapsed after the detection of the S wave is terminated, or a case where a notification that the disaster has converged is received from the outside. If the central device 10 determines that the disaster mode termination condition is satisfied, the central device 10 transmits normal mode transition command notification information to the parent devices 11a and 12a and the child devices 11b and 12b in step S42. The parent devices 11a and 12a and the child devices 11b and 12b determine whether or not the normal mode transition command information has been received in steps S142 and S241. If it is determined that they have been received, the process proceeds to steps S143 and S242. Then, the signal control in the disaster mode is terminated, and the signal control in the normal mode is executed.

  On the other hand, if it is determined in step S142 that the base unit 11a, 12a has not received the normal mode transition command information, in step S144, whether or not a predetermined time has elapsed since the disaster mode end condition was satisfied. If the predetermined time has elapsed, the process proceeds to step S145, and if the predetermined time has not elapsed, the process returns to step S142. In step S145, the parent devices 11a and 12a transmit “third notification” (notification for instructing termination of the disaster mode (resumption of the normal mode)) to the child devices 11b and 12b. Thereafter, in step S143, base units 11a and 12a end signal control in the disaster mode and execute signal control in the normal mode. That is, when the command from the central device 10 cannot be received, the master units 11a and 12a end the disaster mode based on their own determination (step S141), and the slave units 11b and 12b Notify that the disaster mode is to be terminated.

  On the other hand, the slave units 11b and 12b determine whether or not the third notification has been received in step S243, and if received, in step S242, terminate the signal control in the disaster mode and perform the signal control in the normal mode. If it is not received, the process returns to step S241.

As described above, in the present embodiment, based on the detection of the earthquake by the earthquake detector 36 provided in the master units 11a and 12a, not only the master units 11a and 12a themselves but also the slave units 11b and 12b have a disaster mode ( (First signal control) can be executed. Even when the command from the central device 10 cannot be received, the disaster mode (second signal control) can be executed not only in the parent devices 11a and 12a but also in the child devices 11b and 12b. Therefore, it is not necessary to provide the earthquake detector 36 in the subunit | mobile_unit 11b, 12b, and installation cost can be suppressed.
Moreover, by providing two different signal controls of the first signal control and the second signal control as the disaster mode, it is possible to perform appropriate signal control according to the occurrence of the earthquake.

  Note that communication between the parent devices 11a and 12a and the child devices 11b and 12b at the time of a disaster as described above may be performed using a wired communication line or a wireless communication line. In particular, in the case of the traffic signal controller 12 arranged in the independent control area A2, by using a wireless communication line for communication between the master unit 12a and the slave unit 12b, the area A2 does not require any infrastructure of a wired communication line. Thus, the equipment cost can be further suppressed.

<Modification>
FIG. 14 is a flowchart illustrating a procedure of an operation state confirmation process of the traffic signal controller in the modified example.
In the processing procedure described with reference to FIG. 7, when the operation information is acquired from the traffic signal controllers 11 and 12, the request information for the central device 10 to request transmission of the operation information is periodically transmitted to the traffic signal controller. However, in this modification, transmission of periodic request information from the central device 10 is omitted, and operation information is periodically transmitted from the traffic signal controllers 11 and 12. The point is different. Therefore, in FIG. 10, the same processes as those in FIG. 7 are denoted by the same step symbols, and the corresponding processes are denoted by the step symbols with “′”.

  In the present modification, first, the traffic signal controllers 11 and 12 determine their own operating state in step S102, and transmit operating information (periodic transmission) to the central apparatus 10 in step S103 '. The central device 10 determines whether or not the operation information is received from the traffic signal controllers 11 and 12 in step S2, and if the operation information is received, the traffic signal controllers 11 and 12 are determined in step S3. Determine whether it is normal. If the operation information has not been received, it is determined in step S6 ′ whether or not the time scheduled to receive the operation information from the traffic signal controllers 11 and 12 has elapsed. In step S7 ′, request information for requesting operation information is transmitted to the traffic signal controllers 11 and 12. The traffic signal controllers 11 and 12 determine whether or not the request information has been received from the central device 10 (step S104 '), and when the request information is received, the operation information is retransmitted (step S105).

  The subsequent processing in steps S8, S3 to S5 in the central apparatus 10 is the same as the processing described with reference to FIG. Therefore, detailed description is omitted.

<Other variations>
The said embodiment and modification are illustrations in all points, and are not restrictive. The scope of right of the present invention is not the above-described embodiments, but includes all modifications within the scope equivalent to the scope of claims.
For example, in the above embodiment, when a disaster occurs or when the disaster has converged, the central device 10 directly performs a disaster mode (second signal control) from the central device 11a, 12a and the slave devices 11b, 12b. The transition command notification and the end notification of the disaster mode have been performed, but the central mode 10 performs the disaster mode transition command notification and the end notification only to the parent units 11a and 12a of the traffic signal controllers 11 and 12, A disaster mode (second signal control) transition command notification or end notification may be sent from the parent device 11a, 12a to the child device 11b, 12b.

The traffic signal controller 11 in the centralized control area A1 does not necessarily need to use a wireless communication line for communication with the central device 10 or between the parent device 11a and the child device 11b, and wired communication is used for all communication. A line may be used. That is, the wireless communication line can be omitted in the central control area A1.
On the contrary, in the independent control area A2, a wired communication line may not be used for communication between the parent device 12a and the child device 12b, and a wireless communication line is used for all communication including communication with the central device 10. May be used. Therefore, the wired communication line can be omitted in the independent control area A2, and the traffic signal controller 12 in the area A2 does not have to include the wired communication unit 38.

  In the said embodiment, although the earthquake detector 36 was provided in the main | base station 11a, 12a of the traffic signal controller 11, 12, the subunit | mobile_unit 11b, 12b may be provided with the earthquake detector. In addition, the earthquake detectors 36 of the base units 11a and 12a of the traffic signal controllers 11 and 12 are omitted, and the earthquake information acquisition unit 304 provides earthquake information from the outside, for example, an emergency earthquake warning provided by the Japan Meteorological Agency, It may be configured to acquire an earthquake early warning or the like transmitted at. When the earthquake information acquisition unit 304 acquires the earthquake early warning provided by the Japan Meteorological Agency, etc., the earthquake information acquisition unit 304 selects and acquires only the information on the area where the earthquake information is installed from the acquired earthquake early warning It is preferable to provide.

  In the said embodiment, although the earthquake is illustrated as an aspect of a disaster, the traffic signal control system of this invention acquires the information of other disasters, such as a typhoon and a thunderstorm, and the signal by the disaster mode according to these disasters You may be comprised so that control may be performed. In this case, the base units 11a and 12a of the traffic signal controllers 11 and 12 may include a rain sensor, a wind sensor, a water level sensor, or the like instead of (or in addition to) the earthquake sensor 36.

DESCRIPTION OF SYMBOLS 10 Central apparatus 12 Point type traffic signal controller 202 Request information notification part 203 Abnormality judgment part 204 Earthquake information acquisition part (disaster information acquisition part)
205 Control Mode Transition Command Notifying Unit 206 Disaster Area Identification Unit 301 Signal Control Unit 302 Operation Information Generation Unit (State Information Generation Unit)
303 Operation information notification unit (status information notification unit)
304 Earthquake information acquisition unit (second disaster information acquisition unit)

Claims (11)

A central device for traffic control,
A point-type traffic signal controller connected to the central device so as to be capable of wireless communication and performing signal control independently of the central device in normal times,
The traffic signal control system includes a state information generation unit that generates state information related to its own state, and a state information notification unit that transmits the state information to the central device. . The central device is for instructing a transition to a disaster mode that is a control mode at the time of a disaster based on a disaster information acquisition unit that acquires information related to a disaster and information on the occurrence of a disaster acquired by the disaster information acquisition unit A transition command notification unit that transmits disaster mode transition command information to the traffic signal controller, and
The traffic signal control system according to claim 1, wherein the traffic signal controller includes a signal control unit that performs signal control in a disaster mode. The transition command notifying unit has a function of transmitting, to the traffic signal controller, normal mode transition command information for commanding transition to a normal mode that is a control mode in normal times,
The traffic signal control system according to claim 2, wherein the signal control unit has a function of executing signal control in a normal mode based on normal mode transition command information received from the central device.   The central device has an abnormality determination unit that determines that an abnormality has occurred in the traffic signal controller when the state information is not received at a time when the state information is expected to be received from the traffic signal controller. The traffic signal control system according to any one of claims 1 to 3, further comprising: The central device has a request information notification unit that transmits request information for requesting the traffic signal controller to transmit the state information,
The abnormality determination unit determines that an abnormality has occurred in the traffic signal controller when the state information is not received even after a predetermined time has elapsed since the request information notification unit transmitted the request information. The traffic signal control system according to claim 4. The status information notification unit periodically transmits the status information,
The traffic signal control system according to claim 4, wherein the abnormality determination unit determines that an abnormality has occurred in the traffic signal controller when the central device does not receive the state information at a predetermined time. .   The said central apparatus is provided with the abnormality determination part which determines that the abnormality has generate | occur | produced in the said traffic signal controller, when the state information to the effect that there is abnormality from the said state information notification part is received. The traffic signal control system according to any one of -6.   The said central apparatus has a disaster area specific | specification part which specifies a disaster area based on the position of the traffic signal controller determined that abnormality has generate | occur | produced. The traffic signal control system described in. The traffic signal controller has a second disaster information acquisition unit that acquires disaster information independently of the disaster information acquisition unit of the central device,
Even if the second disaster information acquisition unit acquires the disaster information, the signal control unit receives the disaster mode transition command information from the transition command notification unit, and then performs a disaster based on the disaster mode transition command information. The traffic signal control system according to claim 2, wherein signal control according to mode is executed.   The signal control unit, when the second disaster information acquisition unit acquires disaster information and does not receive the disaster mode transition command information from the transition command notification unit, performs signal control by the disaster mode by self-judgment, The traffic signal control system according to claim 9. A point-type traffic signal controller that performs signal control independently from a central device that performs traffic control,
A state information generating unit capable of wirelessly communicating with the central device and generating state information regarding its own state, and a state information notifying unit for wirelessly transmitting the state information to the central device. Traffic signal controller.

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