JP2009009610A - Traffic lights controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a traffic lights controller for refilling control history information which is missing during a period of communication failure. <P>SOLUTION: The traffic lights controller 100 includes: a communication state monitoring part 20 for monitoring the communication state in the communication part; a signal control part 14 for carrying out color display in a signal lamp based on a set signal control plan according to determination that the communication state is in an abnormal state, by the communication state monitoring part 20; a history information accumulating part 16 for accumulating control history information for the signal lamp controlled by the signal control part 14 in the abnormal state to a storing part; and a history information transmitting part 12 for transmitting the accumulated control history information by the communication part in response to receiving a request instruction for the control history information in the communication part, to a communication network. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a configuration of a traffic signal controller.

  Traffic signal controllers (hereinafter referred to as traffic signals) are roughly classified into traffic signals (hereinafter referred to as offline signals) that operate independently without using a telecommunication line, and electrical signals (hereinafter referred to as offline traffic signals). There is a traffic light (hereinafter referred to as online signal) that operates (hereinafter referred to as online operation) by remote control from a signal control device (hereinafter referred to as center) of a traffic control center via a communication line. .

  The offline traffic light has a mechanism for holding a control execution history together with time information in a storage medium for a predetermined period. In order to investigate how the offline traffic light has operated, it is necessary for the worker to be sent to the installation location of the offline traffic light and bring back the control execution history of the storage medium included in the offline traffic light.

  On the other hand, in the online traffic light, the traffic signal control execution history is transmitted to the center every predetermined period. Further, all details during online operation are collectively managed by the center. Therefore, the center can efficiently search and inquire the control execution history stored as a database. For example, when analyzing the situation and cause of a traffic accident in the light of the control execution history of the traffic light at the time of the accident, the offline traffic light can be said to be very effective.

Further, as a conventional example of an on-line traffic signal, for example, a configuration of a traffic signal controller as disclosed in Patent Document 1 is disclosed.
Japanese Patent No. 3021414

  However, when a failure or the like occurs in the telecommunication line with the center or various communication devices existing between them, the on-line traffic signal shifts to an offline operation during a period in which the communication failure occurs. When the communication returns to the normal state, the online traffic light returns to the online operation again. At this time, the control execution history executed by the online signal device during the offline operation is held in a recording medium included in the online signal device. However, since there is no means for transmitting the control history information during the offline operation to the center, there is a problem that the control execution history information is lost in the database held by the center during the period of communication failure.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a traffic signal controller for replenishing control history information that has been lost during a communication failure. It is.

  In order to achieve the above object, according to one aspect of the present invention, a traffic signal controller, communication means for exchanging signals with an external communication network, and information related to control performed on a signal lamp Storage means and control means for controlling the operation of the traffic signal controller, the control means comprising: a communication state monitoring means for monitoring the communication state of the communication means; and a communication state monitoring means. The signal control means for controlling the color display of the signal light based on the set signal control plan in response to the communication state being determined to be abnormal by the control and the signal control means in the abnormal state The history information storage means for storing the control history information of the signal lamp to be stored in the storage means and the control history information stored in response to the request for the control history information being received by the communication means. And a history information transmission means for transmitting to the communication network by means.

  Preferably, when the communication state monitoring unit determines that the communication state is a normal state, the signal control unit controls the color display of the signal lamp based on the signal lamp control signal received by the communication unit, and the history information The storage means accumulates the control history information by the signal control means in the normal state by the storage means, and the history information transmission means causes the communication means to transmit the accumulated control history information at a predetermined period in the normal state. .

  Preferably, the control means further includes a history item designation means for designating a history item of control history information accumulated by the history information accumulation means in an abnormal state in response to an item designation instruction received by the communication means.

  Preferably, the history information transmission unit causes the communication unit to transmit a control history in a time zone designated by the control history information in response to a time zone designation instruction received by the communication unit.

  Preferably, the history information transmission unit causes the communication unit to transmit the control history of the history item designated by the control history information in response to the item designation instruction received by the communication unit.

  Preferably, the control means further includes history information erasure means for erasing control history information stored in the storage means in response to an erasure instruction received by the communication means.

  Preferably, the control means further includes history information erasure means for erasing the control history in the time zone designated by the control history information in response to the time zone designation erasure instruction received by the communication means.

  Preferably, the control means further includes history information erasure means for erasing the control history of the history item designated by the control history information in response to the item designation erasure instruction received by the communication means.

  A history information storage means for storing control history information of signal lights controlled by the signal control means in the storage means when the traffic signal controller is in an abnormal communication state, and a request instruction for control history information is received in the communication means Accordingly, the control history information is stored in the signal control device during the abnormal state of the communication state by providing the history information transmission means for transmitting the accumulated control history information to the communication network by the communication means. The means can be supplemented.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same components are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1 is a diagram showing an outline of the overall configuration of the traffic signal controllers 100, 102, 104 and the traffic control center 200 in the embodiment of the present invention.

  Referring to FIG. 1, a traffic control center 200 is connected to traffic signal controllers 100, 102, 104 installed at road intersections through dedicated lines 106, 108, 110, respectively.

  When the dedicated lines 106, 108, and 110 are in a normal state, the traffic control center 200 passes through the traffic signal controllers 100, 102, and 104, and signal lights (not shown) corresponding to the respective traffic signal controllers. Control. At this time, the control history information that the traffic signal controllers 100, 102, 104 perform on the signal lamps is accumulated in a storage device (not shown) included therein for a predetermined period. Here, the “control history information” refers to information such as cycle length, split, step time, offset, and result of sensitive control, for example. Contains information about what was controlled. The “predetermined period” may be, for example, one cycle from when the main road signal turns blue to blue again when an intersection is assumed, or a predetermined time set in advance. But you can.

  Then, the traffic signal controllers 100, 102, 104 transmit the accumulated control history information to the traffic control center 200 via the dedicated lines 106, 108, 110 for each predetermined period. As the storage device, a rewritable nonvolatile memory may be used, or a removable storage medium such as a hard disk device, an MO (Magneto Optical) disk, or a memory card may be used.

  On the other hand, the traffic control center 200 includes a signal control device (not shown) including a database for storing control history information. Here, the signal control device receives the control history information transmitted from the traffic signal controllers 100, 102, and 104, respectively, and accumulates them in the database.

  FIG. 2 is a diagram showing the appearance of the traffic signal controller 100 and the signal light 112 installed on the road.

  Referring to FIG. 2, traffic signal controller 100 is based on a control signal transmitted from traffic control center 200 when the communication state of leased line 106 is normal, that is, in the online operation mode. Signal control of the signal lamp 112 is performed.

  On the other hand, the traffic signal controller 100 cannot communicate with the traffic control center 200 when the communication state of the dedicated line 106 is abnormal, that is, in the offline operation mode. Therefore, the traffic signal controller 100 performs signal control of the signal lamp 112 independently. At this time, the traffic signal controller 100 accumulates control history information in an internal storage device (not shown) for each predetermined period.

[Description of traffic signal controller configuration]
FIG. 3 is a functional block diagram showing a hardware configuration of the traffic signal controller 100.

  Referring to FIG. 3, traffic signal controller 100 is connected to traffic control center 200 via communication network 400. The traffic signal controller 100 includes a communication unit 4 for exchanging signals with the external communication network 400, control history information of control performed by the traffic signal controller 100 on the signal lamp 112, or an offline operation mode. A storage device 6 for storing the signal control plan of the hour signal lamp 112 and a control calculation unit 2 for controlling the operation of the traffic signal controller 100 are provided. Further, when the communication state of the communication network 400 is normal, that is, in the online operation mode, the control calculation unit 2 determines the signal light 112 based on the control signal from the traffic control center 200 received by the communication unit 4. Take control.

  FIG. 4 is a functional block diagram illustrating a software configuration of the control calculation unit 2 provided in the traffic signal controller 100.

  Referring to FIG. 4, traffic signal controller 100 includes a signal control unit 14 for performing signal control of signal lamp 112 based on a control signal from traffic control center 200 in the online operation mode, and a control history of signal control. History information accumulation unit 16 for accumulating information in the storage device 6 and history accumulation designation for designating and accumulating at least one of a plurality of history items included in the control history information by the history information accumulation unit 16 Unit 18, history information transmission unit 12 for transmitting control history information stored in storage device 6 to traffic control center 200 via communication network 400, and a request signal for control history information from traffic control center 200. The history information request receiving unit 10 for receiving, the history information erasing unit 8 for receiving the erasing signal of the control history information accumulated in the storage device 6, and the communication status of the communication unit 4 The and a communication state monitoring unit 20 for monitoring.

  The signal control unit 14 controls the signal color display based on a command from the traffic control center 200 and a signal control plan calculated from setting of constants of the traffic signal controller 100. The control history information of the signal control unit 14 is accumulated in the storage device 6 by the history information accumulation unit 16 every predetermined period. The constants of the traffic signal controller 100 may be stored in the storage device 6 or may be stored in a ROM (Read Only Memory) (not shown).

  After the traffic signal controller 100 executes control for a predetermined period every predetermined period, the history information accumulating unit 16 executes the execution seconds for each display, the execution seconds for each step in the predetermined period, or sensitive control. The contents of each item of the control history information such as the execution contents of are stored in the storage device 6.

  Further, the communication status monitoring unit 20 checks whether or not the communication status with the traffic control center 200 is a normal status every predetermined period.

  As an inspection method, for example, a method of determining that a communication failure has occurred when information to be transmitted every predetermined period from the traffic control center 200 is not transmitted even after a predetermined period has elapsed. Also good. “Information to be transmitted” is not particularly limited, but includes, for example, a health check message for each layer in communication with the traffic control center 200. That is, for this inspection, a health check can be periodically performed for each communication layer. For example, if any one of the layers to be inspected can be determined to have a failure, the communication state monitoring unit 20 can determine that a communication failure has occurred.

  The history accumulation designation unit 18 can select whether or not the control history information is retained and the contents to be accumulated such as history items of the control history information.

  For example, when it is specified that the control history information is retained during the communication failure period, the history information accumulation unit 16 responds to the occurrence of a communication failure based on the inspection result of the communication failure monitoring unit 20. That is, in the offline operation mode, the control history information of the content item designated by the history accumulation designation unit 18 is held in the storage device 6. Further, when the control history information is designated to be retained when the communication state is normal, the history information accumulation unit 16 is designated by the history accumulation designation unit 18 in the online operation mode. The control history information of the item is held in the storage device 6.

  In addition, since the capacity of the storage device 6 mounted on the traffic signal controller 100 is limited, the control calculation unit 2 selectively selects only the number of execution seconds of each display in the cycle from the control history information. It is also possible to hold it.

  The history information request receiving unit 10 detects whether or not a control history information transmission request message from the traffic control center 200 arrives. Then, the history information request receiving unit 10 can request the history information transmitting unit 12 to transmit control history information in response to the information request received by the communication unit 4.

  When the required time zone or content item of the control history information is limited, the traffic control center 200 specifies the required time zone or the control history information corresponding to the specific content item. A request can be sent to the history information transmitter 12 for transmission.

  Based on the request from the history information request receiving unit 10, the history information transmitting unit 12 notifies the history information accumulating unit 16 of the designated time zone or content item of the requested control history information. Then, the history information transmission unit 12 causes the communication unit 4 to transmit the control history information corresponding to the designated time zone or content item received from the history information storage unit 16 to the traffic control center 200.

  In addition, the control history information transmitted by the history information transmitting unit 12 at this time is, for example, all the time zones or item control histories specified by the request instruction, or a single message information or a group of files or the like As above, it is also possible to transmit, or to divide into a plurality of frames and transmit sequentially.

  Then, the history information erasure unit 8 responds to the erasure request transmitted from the traffic control center 200 with respect to the history information storage unit 16 in the time zone of the control history information designated by the erasure request, or , Notify content items. The history information storage unit 16 causes the storage device 6 to delete the control history information corresponding to the time zone specified by the deletion request or the content item.

  The history information storage unit 16 may retain the history in the storage device 6 by, for example, a method of overwriting the oldest information with the latest information in a ring buffer format.

[Description of configuration of signal control apparatus]
Next, the configuration of the signal control device 300 provided in the traffic control center 200 will be described.

  FIG. 5 is a functional block diagram illustrating a hardware configuration of the signal control device 300 provided in the traffic control center 200.

  Referring to FIG. 5, signal control device 300 is connected to a plurality of traffic signal controllers via external communication network 400. The signal control device 300 stores a communication unit 22 for exchanging signals with the external communication network 400, and control history information for signal lamp control performed in each of a plurality of traffic signal controllers as a database. It includes a storage device 26, an input unit 27 for receiving an instruction input from the outside, and a control calculation unit 24 for controlling the operation of the signal control device 300.

  The signal control device 300 transmits a control signal to the communication network 400 to which a plurality of traffic signal controllers are connected, and controls a signal lamp corresponding to each of the plurality of traffic signal controllers by remote control. And the control log | history information of the control of the signal lamp which a some traffic signal controller each performs is transmitted for every predetermined period. Or you may transmit for every period set in each traffic signal controller. The control calculation unit 24 stores the control history information received by the communication unit 22 as a database in the storage device 26. At this time, if the communication network 400 is in an abnormal state with at least one of the plurality of traffic signal controllers due to a communication failure or the like, the traffic signal controller in which the communication state becomes an abnormal state is operated offline. Operate in mode. That is, the traffic signal controller whose communication state becomes an abnormal state independently performs signal control based on the signal control plan stored in the storage device in advance. Therefore, in the traffic control center 200, a missing part occurs in the control history information stored in the database. For this reason, after the traffic signal controller whose communication state is abnormal is restored to the normal state, the signal control device 300 displays the partial history information corresponding to the missing portion by the user's instruction input, and the communication state is abnormal. Require for a traffic signal controller. Then, in response to receiving the partial history information corresponding to the missing part from the traffic signal controller whose communication state is abnormal, the control calculation unit 24 can replenish the missing part of the database. Become.

  FIG. 6 is a functional block diagram showing a software configuration of the signal control device 300 provided in the traffic control center 200.

  Referring to FIG. 6, traffic control center 200 includes a signal control device 300 for transmitting a control signal to traffic signal controller 100 to control signal lamp 112. The signal control device 300 is transmitted from the traffic signal controller 100 and the history information request unit 40 for requesting the traffic signal controller 100 for control history information of signal control performed by the traffic signal controller 100 on the signal light 112. A history information receiving unit 42 for receiving control history information, a request content designating unit 30 for designating at least one of a plurality of history items included in the control history information, and a traffic signal controller 100 A history erasure request unit 38 for transmitting an instruction to erase the control history information held, an erasure content designation unit 28 for designating history items to be erased, and a database 34 for storing received control history information And to supplement the control history information contained in the database 34 based on the response from the traffic signal controller 100 to the request from the history information requesting unit 40. A database refill unit 32, and a communication state monitoring unit 36 for monitoring the communication state.

  The communication state monitoring unit 36 checks whether or not the communication state with the traffic signal controller 100 is a normal state every predetermined period.

  As an inspection method, for example, a method of determining that a communication failure has occurred when information to be transmitted from the traffic signal controller 100 every predetermined period is not transmitted even after a predetermined period has elapsed. May be. “Information to be transmitted” is not particularly limited, but includes, for example, a health check message for each layer in communication with the traffic control center 200. That is, for this inspection, a health check can be periodically performed for each communication layer. For example, if any of the layers to be inspected can be determined to have a failure, the communication state monitoring unit 36 can determine that a communication failure has occurred.

  The history information request unit 40 causes the communication unit 22 to transmit a request message for requesting the control history information of the time zone and the content item specified by the request content specification unit 30 to the traffic signal controller 100.

  In the request content designating unit 30, the content of the request transmitted from the history information requesting unit 40 can be designated. The content that can be specified by the request content specifying unit 30 is, for example, the time zone and content item of the requested control history information.

  The history information receiving unit 42 causes the communication unit 22 to receive control history information transmitted from the traffic signal controller 100. Then, the history information receiving unit 42 sends the received control history information to the database supplementing unit 32.

  In the database supplementing unit 32, the control history information sent from the history information receiving unit 42 is stored in the database 34.

  For example, the database supplementing unit 32 searches the missing part of the data held in the database 34 for the method of supplementing the missing part of the control history information of the database 34 in the database supplementing unit 32. Then, the database replenishing unit 32 compares the lost time zone that has been hit with the time value of the received control history information. Based on the comparison result, for example, when it is confirmed that there is a missing time zone in the control history information corresponding to the traffic signal controller 100, the database supplementing unit 32 causes the request content designating unit 30 to designate the missing time zone. Thus, the history information requesting unit 40 requests the traffic signal controller 100 to request partial history information corresponding to the missing part. Or you may input the instruction | indication which performs the designation | designated of a time slot | zone or a content item, and the request | requirement of partial history information to the input part 27 by a user. And the database supplement part 32 may use the method of adding the partial history information included in the response from the traffic signal controller 100 to the missing part of the database 34.

  Note that the database 34 and the database supplementing unit 32 can also be realized as separate hardware devices independent of the signal control device 300.

  The history erasure request unit 38 transmits a request message for erasing the retained control history information to the traffic signal controller 100.

  In the erasure content designation unit 28, the content of the erasure request transmitted from the history erasure request unit 38 can be designated. The contents that can be specified by the deletion content specifying unit 28 are, for example, the time zone and the content item of the control history information to be deleted.

[Description of traffic signal controller operation]
Next, the traffic signal controller 100 whose basic configuration has been described with reference to FIGS. 3 and 4 monitors the line of the communication unit 4 and controls specified items in response to a communication failure with the traffic control center 200. An operation for accumulating history information will be described.

FIG. 7 is a flowchart for explaining the operation of the traffic signal controller 100.
Referring to FIG. 7, first, communication state monitoring unit 20 monitors the communication state with signal control device 300 provided in traffic control center 200.

  That is, the communication state monitoring unit 20 determines whether or not the information transmitted from the signal control device 300 has been received after the first predetermined time has elapsed since the previous reception (step S101).

  In step S101, when the information transmitted from the signal control device 300 is received after the first predetermined time has elapsed since the previous reception, the communication state monitoring unit 20 determines that the communication state is a normal state ( Step S102).

  Then, the history information accumulation unit 16 starts accumulating control history information of the history item designated in the online operation mode (step S103).

  Subsequently, the history information transmitting unit 12 transmits the control history information accumulated after a predetermined period to the traffic control center 200 (step S104).

And the control calculating part 2 returns a process to step S101.
On the other hand, when the information transmitted from the signal control device 300 is not received after the first predetermined time has elapsed since the last reception in step S101, the communication state monitoring unit 20 starts after the first predetermined time has elapsed. Further, it is determined whether or not information is received within the second predetermined time (step S105).

  In step S105, when information is received within the second predetermined time, the control calculation unit 2 shifts the process to step S102.

  On the other hand, if no information is received within the second predetermined time in step S105, the communication state monitoring unit 20 determines that the communication state is an abnormal state (step S106).

  Then, the history information accumulation unit 16 starts accumulating control history information of the history item designated in the offline operation mode (step S107).

  Then, the communication state monitoring unit 20 determines whether or not the communication state has been restored to the normal state (step S108).

  If the communication state has not recovered to the normal state in step S108, the control calculation unit 2 shifts the process to step S107.

  On the other hand, when the communication state is restored to the normal state in step S108, the control calculation unit 2 shifts the process to step S103.

[Description of Operation of Signal Control Device 300]
Next, the operation of the signal control apparatus 300 whose basic configuration has been described with reference to FIGS. 5 and 6 will be described.

  FIG. 8 is a flowchart for explaining the operation of the signal control device 300 provided in the traffic control center 200.

  Referring to FIG. 8, first, the communication state monitoring unit 36 monitors the communication state between the signal control device 300 and the traffic signal controller 100 connected via the communication network 400 (step S201).

  That is, the communication state monitoring unit 36 determines whether or not the information transmitted from the traffic signal controller 100 has been received after the first predetermined time has elapsed since the previous reception.

  In step S201, when the information transmitted from the traffic signal controller 100 is received after the first predetermined time has elapsed since the previous reception, the communication state monitoring unit 36 determines that the communication state is a normal state. (Step S202).

  Subsequently, the database supplementation unit 32 stores the control history information included in the received information in the database 34 (step S203).

And the control calculating part 24 returns a process to step S201.
On the other hand, when the information transmitted from the traffic signal controller 100 is not received after the first predetermined time has elapsed since the previous reception in step S201, the communication state monitoring unit 36, after the first predetermined time has elapsed. To determine whether or not to receive the information within a second predetermined time (step S204).

  In step S204, when information is received within the second predetermined time, the control calculation unit 24 shifts the process to step S202.

  On the other hand, if no information is received within the second predetermined time in step S204, the communication state monitoring unit 36 determines that the communication state is an abnormal state (step S205).

  Next, the communication state monitoring unit 36 determines whether or not the communication state has been restored to a normal state (step S206).

  If the communication state has not recovered to the normal state in step S206, the communication state monitoring unit 36 continues monitoring until the communication state becomes the normal state.

  On the other hand, when the communication state is restored to the normal state in step S206, the control calculation unit 24 returns the process to step S201.

[Description of supplementing partial history information to the database]
Next, the signal controller 300 requests the traffic signal controller 100 for partial history information corresponding to the missing portion of the database 34, and replenishes the database 34 with the partial history information based on a response to the request. Will be described.

  FIG. 9 is a flowchart when the database 34 is supplemented with partial history information corresponding to a missing portion of the control history information in the signal control device 300.

  First, the database replenishing unit 32 searches the database 34 for the presence or absence of a missing portion of the control history information (step S301).

  In the traffic signal controller 100, when the stored control history information includes a missing part, the request content designating unit 30 designates an item corresponding to the missing part. Then, the history information request unit 40 transmits a request instruction for partial history information corresponding to the missing part (step S302).

  In the traffic signal controller 100, the history information request receiving unit 10 receives a partial history information request instruction (step S303).

  In response to receiving the partial history information request instruction, the history information transmitting unit 12 transmits the partial history information accumulated by the history information accumulating unit 16 to the signal control device 300 in the offline operation mode (step S304).

  Next, in the signal control device 300, the history information receiving unit 42 receives partial history information (step S305).

  Subsequently, the database supplementing unit 32 supplements the received partial history information to the database 34 (step S306).

  Next, the history deletion request unit 38 transmits an instruction to delete the control history information stored in the storage device 6 included in the traffic signal controller 100 to the traffic signal controller 100 in accordance with an instruction from the user. (Step S307).

  Then, in the traffic signal controller 100, the history information deleting unit 8 receives an instruction to delete the control history information (step S308).

  At this time, the history information erasure unit 8 erases the control history information in response to the reception of the erasure instruction (step S309).

  As described above, according to the present invention, the control history information in the offline operation mode during the communication failure period of the traffic signal controller 100 can be collectively transmitted to the traffic control center 200 after the communication failure is recovered.

  Further, by holding or transmitting only the information of the specified content item in the control history information, the bandwidth of the communication line and the capacity of the storage device 6 that can be mounted on the traffic signal controller 100 can be efficiently used. Can do.

  Furthermore, by deleting the control history information stored in the storage device 6 according to an instruction from the traffic control center 200, the storage device 6 that can be mounted on the traffic signal controller 100 can be used efficiently.

  Further, for example, since the capacity of the storage medium provided in the traffic signal controller 100 installed on the roadside is limited, in order to use the storage area of the storage medium more effectively, the oldest included in the storage medium in the ring buffer format It is also possible to provide a function such as overwriting the information with the latest information.

  On the other hand, the signal control device 300 requests the traffic signal controller 100 for the control history information of the specified time zone or the specified content item, thereby receiving the control history information missing during the communication failure, and the database 34. The missing control history information can be supplemented.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows the outline of the whole structure of the traffic signal controller 100,102,104 and the traffic control center 200 in embodiment of this invention. It is a figure which shows the external appearance of the traffic signal controller 100 and the signal light 112 which are installed in the road. 2 is a functional block diagram showing a hardware configuration of a traffic signal controller 100. FIG. 3 is a functional block diagram illustrating a software configuration of a control calculation unit 2 provided in the traffic signal controller 100. FIG. It is a functional block diagram which shows the hardware constitutions of the signal control apparatus 300 with which the traffic control center 200 is equipped. It is a functional block diagram which shows the software structure of the signal control apparatus 300 with which the traffic control center 200 is equipped. 5 is a flowchart for explaining the operation of the traffic signal controller 100. 5 is a flowchart for explaining the operation of a signal control device 300 provided in the traffic control center 200. 6 is a flowchart when the database 34 is supplemented with partial history information corresponding to a missing portion of control history information in the signal control device 300.

Explanation of symbols

  2 control calculation unit, 4 communication unit, 6 storage device, 8 history information deletion unit, 10 history information request reception unit, 12 history information transmission unit, 14 signal control unit, 16 history information storage unit, 18 history storage designation unit, 20 Communication state monitoring unit, 22 communication unit, 24 control operation unit, 26 storage device, 27 input unit, 28 deletion content designation unit, 30 request content designation unit, 32 database supplementation unit, 34 database, 36 communication state monitoring unit, 38 history Deletion request unit, 40 History information request unit, 42 History information reception unit, 100, 102, 104 Traffic signal controller, 106, 108, 110 Dedicated line, 112 Signal light, 200 Traffic control center, 300 Signal control device, 400 Communication network .

Claims (8)

A traffic signal controller,
Communication means for exchanging signals with an external communication network;
Storage means for storing information related to control performed on the signal lamp;
Control means for controlling the operation of the traffic signal controller,
The control means includes
Communication state monitoring means for monitoring the communication state of the communication means;
A signal control means for controlling the color display of the signal light based on a set signal control plan in response to the communication state being determined to be an abnormal state by the communication state monitoring means;
History information storage means for storing control history information of the signal lamp controlled by the signal control means in the abnormal state in the storage means;
Traffic signal control including history information transmission means for causing the communication means to transmit the accumulated control history information to the communication network in response to the request for control history information being received in the communication means. Machine. The signal control means, when the communication status monitoring means determines that the communication status is normal, controls the color display of the signal lamp based on the signal lamp control signal received by the communication means,
The history information storage means stores the control history information by the signal control means in the normal state by the storage means,
2. The traffic signal controller according to claim 1, wherein the history information transmission unit causes the communication unit to transmit the accumulated control history information at a predetermined period in the normal state.   The control means further includes a history item designation means for designating a history item of the control history information stored by the history information storage means in the abnormal state in response to an item designation instruction received by the communication means. The traffic signal controller according to claim 1, comprising:   2. The traffic signal according to claim 1, wherein the history information transmission unit causes the communication unit to transmit a control history of a time zone designated by the control history information in response to a time zone designation instruction received by the communication unit. Control machine.   The traffic signal control according to claim 1, wherein the history information transmitting means causes the communication means to transmit a control history of a history item designated by the control history information in response to an item designation instruction received by the communication means. Machine.   The traffic signal control according to claim 1, wherein the control means further includes history information erasing means for erasing the control history information stored in the storage means in response to an erasure instruction received by the communication means. Machine.   The control means further includes history information erasure means for erasing a control history in a time zone designated by the control history information in response to a time zone designation erasure instruction received by the communication means. The traffic signal controller described.   The control means further includes history information erasure means for erasing a control history of a history item designated by the control history information in response to an item designation erasure instruction received by the communication means. Traffic signal control machine.

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