JP7197082B2 - TRAFFIC SIGNAL CONTROL SYSTEM, TRAFFIC SIGNAL CONTROL METHOD, TRAFFIC SIGNAL CONTROLLER AND COMPUTER PROGRAM - Google Patents

Description

The present invention relates to a traffic signal control system, a traffic signal control method, a traffic signal controller, and a computer program.

Traffic signal control methods include a centralized control method (remote control) in which the operation of the traffic signal controllers at each intersection is collectively controlled by the central equipment of the traffic control center, and a point control method in which each traffic signal controller operates independently. method (see Non-Patent Document 1).
In the centralized control system, a central unit and a traffic controller are connected via a communication line or the like, and centralized control is performed by transmitting a signal control command from the central unit to the traffic controller.

"Revised Guide to Traffic Signals", Society of Traffic Engineers, July 2006, p. 96-98

A central unit in a centralized control system may perform system control on the route by centrally controlling a plurality of traffic controllers installed at a plurality of intersections included in a certain section.

A wired telephone line or the like is generally used as a communication line that connects the central unit and the traffic signal controller. is mounted, wireless communication is performed between the central unit and the traffic controller, and signal control commands are transmitted.

In this case, if a communication failure such as a communication interruption occurs due to a change in the propagation path of radio waves between one of the plurality of traffic signal controllers and the central unit, the central unit There is a possibility that appropriate signal control cannot be performed, such as being unable to give a signal control command to the traffic signal controller in which a defect has occurred, making it impossible to maintain system control.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to provide a technique capable of appropriately performing signal control.

A traffic signal control system, which is one embodiment, includes a plurality of traffic signal controllers respectively installed at intersections included in a section of system control, and notifies a signal control command for system control to the plurality of traffic controllers. A traffic signal control system comprising: a central device for controlling the traffic signal, wherein the central device includes a host-side control unit that generates the signal control command for each of the plurality of traffic signal controllers; a higher side communication unit that transmits to each of a plurality of traffic signal controllers, and the plurality of traffic signal controllers receive the signal control command of their own device; and a lower side communication unit that receives the received signal control a lower-side control unit that controls a signal lamp based on a command; and a lower-side storage unit that stores lower-side accumulated data, which is a data group in which the received signal control commands of its own device are accumulated, When a communication failure occurs with the central unit, the lower-side control unit outputs a signal corresponding to the current date type and time among the signal control commands of the own device included in the lower-side accumulated data. The signal lamp device is controlled based on the control command.

Further, a traffic signal control method according to another embodiment includes a plurality of traffic signal controllers respectively installed at intersections included in a section of system control, and transmitting a signal control command for system control to the plurality of traffic signal controllers. a central unit for notifying traffic controllers, wherein said central unit generates said signal control commands for each of said plurality of traffic signal controllers; and said central unit generates a step of transmitting the signal control command to each of the plurality of traffic controllers; a step of the traffic controller receiving the signal control command of its own; and a step of the traffic controller receiving the received signal. a step of controlling a traffic light device based on a control command; and a step of the traffic signal controller storing lower-side accumulated data, which is a data group in which the received signal control commands of its own machine are accumulated. The step of the traffic controller controlling the signal lamp device based on the received signal control command includes, when a communication failure occurs with the central unit, the automatic signal included in the lower-order accumulated data. The signal lamp device is controlled based on the signal control command corresponding to the current date type and time among the signal control commands of the machine.

A traffic signal controller according to another embodiment is a traffic signal controller installed at an intersection included in a system control section, and includes a lower side communication unit that receives a signal control command for system control, and a receiving a lower-side control unit for controlling a signal lamp device based on the signal control command received; , when a communication failure occurs with the central unit that notifies the signal control command, the lower-side control unit stores the current date type and time in the signal control command included in the lower-side accumulated data. to control the signal lamp device based on the signal control command corresponding to the

A computer program that is still another embodiment is a computer program for causing a computer to control a traffic light device by a traffic signal controller installed at an intersection included in a section of system control, wherein the computer controls system control a step of receiving a signal control command for; a step of controlling the signal lamp device based on the received signal control command; and a computer program for executing a step of storing, wherein the step of controlling the signal lamp based on the received signal control command is performed when a communication failure occurs with the central unit that notifies the signal control command. (2) a computer program for controlling the signal lamp based on the signal control command corresponding to the current date type and time among the signal control commands contained in the lower-order accumulated data;

According to the present invention, the signal control finger can be appropriately performed.

FIG. 1 is a diagram showing an example of the overall configuration of a traffic signal control system. FIG. 2 is a block diagram showing an example of the configuration of a traffic controller. FIG. 3 is a functional block diagram showing the internal configuration of the central unit. FIG. 4 is a flow chart showing an example of control processing of the traffic light device executed by the control unit of the traffic controller according to the first embodiment. FIG. 5 is a diagram showing an example of signal control commands transmitted from the central unit. FIG. 6 is a diagram showing an example of the receiving side database stored in the storage unit of the traffic controller. FIG. 7 is a flowchart showing an example of normal processing. FIG. 8 is a flowchart illustrating an example of non-reception processing. FIG. 9 is a flowchart showing an example of signal control instruction transmission processing performed by the control unit of the central unit. FIG. 10 is a flowchart illustrating an example of maintenance processing. FIG. 11 is a diagram showing an example of the transmission side database stored in the storage unit of the central device. FIG. 12 is a diagram for explaining the operation of each traffic controller and the central device when communication of one traffic controller is disconnected in the system of the first embodiment. FIG. 13 is a sequence diagram illustrating an example of restoration processing. FIG. 14 is a diagram showing an example of signal control execution information transmitted by the traffic controller. FIG. 15 is a diagram showing an example of loss compensation information transmitted by the traffic controller. FIG. 16 is a flow chart showing an example of maintenance processing executed by the central device of the system according to the second embodiment. FIG. 17 is a diagram for explaining the operation of each traffic controller and the central device when communication of one traffic controller is cut off in the system of the second embodiment. FIG. 18 is a diagram for explaining another example of specifying an execution target.

First, the contents of the embodiments will be listed and explained.
[Overview of embodiment]
(1) A traffic signal control system according to one embodiment includes a plurality of traffic signal controllers respectively installed at intersections included in a section of system control, and a signal control command for system control to the plurality of traffic signal controllers. a central device that notifies traffic signal controllers, wherein the central device includes a higher-level control unit that generates the signal control command for each of the plurality of traffic signal controllers; and the generated signal control a higher side communication unit that transmits a command to each of the plurality of traffic controllers, and the plurality of traffic controllers has a lower side communication unit that receives the signal control command of its own device; a lower-side control unit that controls a signal lamp device based on the signal control command; and a lower-side storage unit that stores lower-side accumulated data, which is a data group in which the received signal control commands of the own device are accumulated. When a communication failure occurs with the central unit, the lower-side control unit, among the signal control commands of its own device included in the lower-side accumulated data, uses the current day type and time The signal lights are controlled based on corresponding signal control commands.

According to the system with the above configuration, even if a plurality of traffic signal controllers includes a traffic signal controller in which communication failure such as communication failure occurs, the traffic signal controller in which communication failure has occurred Since the signal lamp device is controlled based on the signal control command corresponding to the current time among the side accumulated data, the signal control executed in the past is executed on the same date and time as the present. As a result, it is possible to execute the control that was executed in the past traffic conditions similar to the current traffic conditions, and to appropriately perform the signal control.

(2) In the above traffic signal control system, the central unit includes an upper-side storage unit that stores upper-side accumulated data, which is a data group in which the transmitted signal control commands are accumulated for each of the plurality of traffic signal controllers. It is preferable to further have

(3) In the above traffic signal control system, when detecting the following disconnection controller, the higher-order control unit selects the current It is preferable to extract the signal control command of the cutting controller corresponding to the date type and time, and to generate the signal control command of the following peripheral controller based on the extracted signal control command of the cutting controller. .
Disconnection controller: Traffic signal controller with which communication failure has occurred with the central unit Peripheral controller: Traffic signal controller that is included in the same system control section as the disconnection controller and is communicating with the central unit In this case, the upper level The side controller can obtain the signal control command currently used by the cutting controller. Furthermore, since the signal control command for the peripheral controller is generated based on the signal control command currently used by the cutting controller, the signal control for the peripheral controller is more appropriately performed in accordance with the signal control for the cutting controller. be able to. As a result, it is possible to more appropriately maintain system control between the cutting controller and the peripheral controllers.

(4) In the above traffic signal control system, it is preferable that the higher-level controller stops transmitting the signal control command to the following peripheral controllers when the following disconnection controller is detected.
Disconnection controller: A traffic signal controller with which communication failure has occurred with the central unit Peripheral controller: A traffic signal controller that is included in the same system control section as the disconnection controller and is communicating with the central unit In this case, the peripheral When the transmission of the signal control command is stopped, the controller determines that a communication failure has occurred, similar to the disconnection controller, and executes signal control based on the signal control command corresponding to the current day type and time. do. As a result, it is possible to reproduce the signal control executed in the past at a plurality of intersections on the same date and time as the present, and maintain the system control.

(5) In the above traffic signal control system, each intersection where the disconnection controller and the peripheral controller are installed preferably constitutes one sub-area within the section.
In this case, appropriate signal control can be performed within the traffic controller that executes signal control with the same cycle length.

(6) In the above traffic signal control system, it is preferable that each intersection where the peripheral controller is installed is located within a predetermined range with respect to the intersection where the disconnection controller is installed in the section.

(7) In the above traffic signal control system, it is preferable that the predetermined range is a range from the intersection where the disconnection controller is installed to the intersection located before the important intersection adjacent to the intersection.

(8) In the above traffic signal control system, the plurality of traffic signal controllers generate execution information indicating the control of the signal light device executed by themselves, and store the execution information in the lower storage unit. The central unit transmits a transmission request requesting transmission of execution information generated in a predetermined period from among the execution information accumulated in the lower storage unit to at least one traffic signal controller among the plurality of traffic controllers. It is preferable to transmit the execution information of the predetermined period to the one traffic controller.
In this case, the central unit can acquire the execution information of the traffic controller during the communication failure as the execution history.

(9) A traffic signal control method according to another embodiment includes a plurality of traffic signal controllers respectively installed at intersections included in a system control section, and transmitting signal control commands for system control to the plurality of traffic signals. a central device for notifying controllers, wherein the central device generates the signal control command for each of the plurality of traffic signal controllers; a step of transmitting the signal control command to each of the plurality of traffic controllers; a step of the traffic controller receiving the signal control command of its own device; and a step of the traffic controller receiving the received a step of controlling a traffic light device based on a signal control command; and a step of the traffic signal controller storing lower-side accumulated data, which is a data group in which the received signal control commands of its own machine are accumulated. wherein the step of the traffic controller controlling the traffic light device based on the received signal control command is included in the lower-order accumulated data when a communication failure occurs with the central unit. The signal lamp device is controlled based on the signal control command corresponding to the current date type and time among the signal control commands of the own machine.

(10) Another embodiment of the traffic controller is a traffic controller installed at an intersection included in the system control section, and is a lower-side communication that receives a signal control command for system control. a lower-side control unit that controls a signal lamp based on the received signal control command; and a lower-side storage unit that stores lower-side accumulated data, which is a data group in which the received signal control command is accumulated. , wherein, when a communication failure occurs with the central unit that notifies the signal control command, the lower-side control unit replaces the current signal control command among the signal control commands contained in the lower-side accumulated data. The signal lights are controlled based on a signal control command corresponding to the type of day and time.

(11) A computer program, which is another embodiment, is a computer program for causing a computer to control a traffic light device by a traffic signal controller installed at an intersection included in a system control section, the computer comprising: a step of receiving a signal control command for system control; a step of controlling the signal lamp device based on the received signal control command; a step of storing data, and a step of controlling the signal lamp based on the received signal control command, wherein a communication failure occurs with a central unit that notifies the signal control command. The computer program controls the signal lamp based on the signal control command corresponding to the current date type and time among the signal control commands included in the lower-order accumulated data when the computer program is executed.

[Details of embodiment]
Preferred embodiments are described below with reference to the drawings.
At least a part of each embodiment described below may be combined arbitrarily.

[Overall configuration of traffic signal control system]
FIG. 1 is a diagram showing an example of the overall configuration of a traffic signal control system.
In FIG. 1, a traffic signal control system 1 includes a plurality of signal lights 2, a plurality of traffic signal controllers 4, a central device 6, a roadside sensor 8, a roadside communication device 10, and the like.

In FIG. 1, signal lights 2 and traffic controllers 4 are installed at each of a plurality of intersections Ci (i=1 to 12).
In FIG. 1, only one signal lamp 2 is shown at each intersection Ci for the sake of simplification of illustration, but in reality, four signal lamps 2 are installed for going up and down roads that intersect each other. be.

Also, the central device 6 is installed in a traffic control center or the like.
The traffic signal controller 4 and the central device 6 are capable of wireless communication by a mobile communication system such as LTE (Long Term Evolution), and by wirelessly communicating with each other, mutual exchange of information is possible.

The central device 6 controls the traffic signal controllers 4 belonging to the area under its own jurisdiction by system control, which is control over a group of traffic signal controllers 4 on the same section, and surface control, which is an extension of the system control to the road network. has the function of executing
The central device 6 generates signal control parameters based on traffic information obtained from the roadside sensors 8 and roadside communication devices 10 and transmits signal control commands including the signal control parameters to each traffic controller 4 .

The traffic controller 4 receives a signal control command given from the central device 6 via wireless communication, and performs light color control (signal control) of the signal lamp 2 based on the signal control command.

The roadside sensor 8 may be, for example, a vehicle sensor that ultrasonically senses a vehicle 5 traveling directly below, a loop coil that senses the vehicle 5 based on changes in inductance, or a camera image that is image-processed to measure traffic volume and vehicle speed. It consists of an image sensor, etc.
The roadside sensor 8 is installed on the upstream side of each direction extending from the target intersection Ci, and measures the number of vehicles flowing into the intersection Ci (inflow traffic volume) and vehicle speed.

The roadside sensor 8 is connected to the traffic signal controller 4 installed at the target intersection Ci via a wired or wireless communication line. The roadside sensor 8 gives the measurement result to the traffic signal controller 4 through a communication line. The measurement result is used by the traffic controller 4 for light color control of the signal lamp 2 and is also transferred to the central device 6 by the traffic controller 4 .
The measurement results include the traffic volume flowing into the intersection Ci, the vehicle speed measurement results, and the like.

The roadside communication device 10 is a wireless communication device that wirelessly transmits and receives various types of information to and from an in-vehicle communication device mounted on the vehicle 5 .
The roadside communication device 10 has wireless communication functions such as a wireless LAN, an optical beacon, and a radio wave beacon. The roadside communication device 10 is installed on the upstream side of each route extending from the target intersection Ci, and can communicate with the vehicle-mounted communication device of the vehicle 5 traveling on the upstream side of the road flowing into the target intersection Ci.

The roadside communication device 10 is connected to the traffic signal controller 4 installed at the target intersection Ci via a wired or wireless communication line. The roadside communication device 10 can exchange information with the central device 6 via the traffic signal controller 4 connected by a communication line.

The roadside communication device 10 transmits traffic information and the like distributed by the central device 6 to the vehicle-mounted communication device. The roadside communication device 10 also receives probe information and the like of the vehicle 5 from the vehicle-mounted communication device, and transmits the information to the central device 6 via the traffic signal controller 4 .
The probe information of the vehicle 5 includes vehicle information such as position information, speed information, vehicle type information, and vehicle ID of the vehicle 5 .

FIG. 2 is a block diagram showing an example of the configuration of the traffic controller 4. As shown in FIG.
The traffic controller 4 controls lighting, extinguishing, and blinking of each signal lamp such as green, yellow, and red of the signal lamp device 2 based on the signal control command from the central device 6 .
As shown in FIG. 2, the traffic signal controller 4 includes a control unit 14 (lower side control unit), a lamp drive unit 16, a communication unit 18 (lower side communication unit), a storage unit 20 (lower side storage part).

The control unit 14 is configured by a CPU (Central Processing Unit) or the like, and configures a computer together with a storage unit 20 including a memory and a hard disk.
Various computer programs and data for the control unit 14 to execute are stored in the storage unit 20 . Functions of the control unit 14 are realized by the control unit 14 executing these computer programs.

The lamp device drive unit 16 includes a semiconductor relay (not shown), and turns on/off the power supplied to each signal lamp of the signal lamp device 2 based on the signal switching timing generated by the control unit 14 .
The communication unit 18 has a function as a terminal device of the mobile communication system and performs wireless communication with the central device 6 .

The control unit 14 is connected to the lamp drive unit 16 and the communication unit 18 via an internal bus. The control unit 14 controls operations of these hardware units.
The control unit 14 generates the light color switching timing of the signal lamp device 2 according to the signal control command given from the central device 6 by wireless communication. When the control unit 14 is permitted to perform terminal-sensitive control by the central device 6, the control unit 14 generates the light color switching timing of the signal lamp 2 according to the result of the terminal-sensitive control performed by the control unit 14 itself.
The traffic controller 4 generates a light color switching timing based on a signal control command or the like, and controls the signal lamp 2 by driving the signal lamp 2 based on this.

The control unit 14 also has a function of registering received signal control commands in a receiving side database 42 (to be described later) stored in the storage unit 20 .
Furthermore, when a communication failure occurs with the central device 6, the control unit 14 controls the signal lamp device 2 based on the signal control command corresponding to the current day type and time from the receiving side database 42. have a function.

Further, the control unit 14 generates signal control execution information indicating the content of the signal control executed by the device 4, registers it in the execution information database 49 (described later) stored in the storage unit 20, and It also has a function of transmitting control execution information to the central device 6 .
In addition, the control unit 14 also has a function of transferring the measurement result given from the roadside sensor 8 and the probe information given from the roadside communication device 10 to the central device 6 . The control unit 14 also has a function of transferring traffic information for the in-vehicle communication device provided from the central device 6 to the roadside communication device 10 .

In addition, when registering the signal control command from the central unit 6 in the receiving side database 42 stored in the storage unit 20, the control unit 14 may perform some functions such as stair holding (function to stop at a specific step), which will be described later. may be provided with a function to select and set not to register the item. Further, the control unit 14 may have a function of not registering the signal control command in the receiving side database 42 stored in the storage unit 20 when receiving a notification from the central device 6 that the signal control command is not to be registered.

The storage unit 20 stores various computer programs as well as the receiving side database 42 and the execution information database 49 described above.
The receiving side database 42 is a database for accumulating received signal control commands of the own device 4, and a plurality of received signal control commands are accumulated. That is, the receiving side database 42 constitutes lower side accumulated data, which is a data group in which received signal control commands are accumulated.
The execution information database 49 is a database for accumulating signal control execution information generated by the control unit 14, and stores a plurality of signal control execution information generated by the control unit 14 in the past.

FIG. 3 is a functional block diagram showing the internal configuration of the central device 6. As shown in FIG.
As shown in FIG. 3, the central device 6 of the present embodiment includes a control section 22 (upper-order control section), a display section 24, a communication section 26 (upper-order communication section), a storage section 28 (upper-order storage ) and an operation unit 30 .

The control unit 22 is composed of a CPU and the like, and constitutes a computer together with a storage unit 28 including a memory and a hard disk.
Various computer programs and data for the control unit 22 to execute are stored in the storage unit 28 . Functions of the control unit 22 are realized by the control unit 22 executing these computer programs.

The communication unit 26 has a function as a terminal device of a mobile communication system, and performs radio communication with each traffic controller 4 .

The control unit 22 is connected to the above hardware units via an internal bus, and controls the operations of these units.
The control unit 22 collects measurement results from the roadside sensor 8 and probe information from the roadside communication device 10, and processes various traffic information. A control command is generated for each traffic controller 4 .

The control unit 22 gives a signal control command generated for each traffic controller 4 to each traffic controller 4, and performs overall signal control in the area under its jurisdiction.
Further, when a communication failure occurs in one of the traffic signal controllers 4, the control unit 22 controls other traffic signal controllers 4 other than the traffic signal controller 4 in which the communication failure has occurred. has a function of executing maintenance processing for maintaining system control.

Furthermore, the control unit 22 also has a function of registering a transmitted signal control command in a transmission side database 46 (to be described later) stored in the storage unit 28 .
In addition, the control unit 22 sends a transmission request requesting transmission of signal control execution information generated in a predetermined period of the signal control execution information accumulated in the execution information database 49 of the traffic signal controller 4 to traffic signal control. It also has a function of transmitting signal control execution information for a predetermined period to the traffic controller 4 .

Further, when registering the signal control command transmitted by the central device 6 in the transmission side database 46 stored in the storage unit 28, the control unit 22 selects not to register some items such as stairs retention. A function that can be set by In addition, when the control unit 22 intervenes in signal control due to a traffic-specific event or the like, the control unit 22 transmits to the central unit 6 and the traffic signal controller 4 that the signal control command is not to be registered, and stores the signal control command in the storage unit 28. A function for not registering in the transmitting side database 46 stored in the storage unit 20 and in the receiving side database 42 stored in the storage unit 20 may be provided.

In addition to various computer programs, the storage unit 28 stores the transmission side database 46 and the execution history database 51 described above.
The transmission-side database 46 is a database for accumulating the transmitted signal control commands transmitted by the device 6 , and a plurality of transmitted signal control commands are stored for each traffic signal controller 4 . In other words, the transmission side database 46 constitutes upper side accumulated data, which is a data group in which the transmitted signal control commands are accumulated for each traffic controller 4 .
The execution history database 51 is a database for accumulating signal control execution information given from the traffic controller 4, and the signal control execution information given from the traffic controller 4 in the past is stored for each traffic controller 4. Multiple stored.

The display unit 24 is composed of a display screen that can display a road map of the area under its control, the positions of all the signal lights 2 and the traffic signal controllers 4 on the road map, and traffic information. It is an output interface for outputting to the operator the traffic conditions such as the traffic signal controller 4 and the operation status of each traffic signal controller 4 .
The operation unit 30 is an input interface such as a keyboard and mouse. The operator can give necessary commands to the central device 6 through the operation unit 30 .

[Regarding the first embodiment]
[Regarding the control process of the signal lamp device 2 by the traffic controller 4]
FIG. 4 is a flowchart showing an example of control processing of the traffic light device 2 executed by the control unit 14 of the traffic controller 4 according to the first embodiment.
The control unit 14 first determines whether or not communication failure has occurred with the central device 6 (step S1).

Here, the term "communication failure" means that no signal control command is received from the central unit 6 for a predetermined period of time (for example, 10 minutes) or a predetermined number of times ( For example, it refers to a case where an error occurs in receiving signal control commands consecutively (for example, twice).
If the control unit 14 does not receive a signal control command from the central unit 6 for a predetermined time, or if an error occurs in receiving the signal control command for a predetermined number of times in succession, the control unit 14 detects a communication failure with the central unit 6 . determine that it has occurred.

When it is determined in step S1 that no communication failure has occurred with the central device 6, the control unit 14 determines whether or not a signal control command transmitted from the central device 6 has been received (step S3).
When determining that the signal control command has been received, the control unit 14 proceeds to step S4 and registers the received signal control command in the receiving side database 42 (step S4).

FIG. 5 is a diagram showing an example of the signal control command 40 transmitted from the central device 6. As shown in FIG.
FIG. 6 is a diagram showing an example of the receiving side database 42 stored in the storage unit 20 of the traffic controller 4. As shown in FIG.

FIG. 5 shows part of the signal control command 40. FIG.
Among the items included in the signal control command 40, the "read command" is a command for giving the timing for creating or updating the multi-step operation time table to the signal controller having a learning function. In addition to remote control by the central device 6, the control unit 14 can also perform control using a multi-step operation time table. For example, 10 to 30 patterns of the multi-stage operation time table may be prepared in one signal controller. Control can be executed by switching these patterns, for example, depending on the time period.
Among the above items, "hold stairs" is a command relating to holding the stairs in operation for a long time.
Among the above items, "status" refers to the method of presenting signals and the state of execution of additional functions.
Among the above items, "Sensory permission" is a command regarding whether or not to allow the traffic controller 4 to perform a sensory operation.
Among the above items, the "sensitivity fluctuation range" is a command relating to the fluctuation range of the signal display time in the responsive operation of the traffic controller 4. FIG.
Among the above items, "cycle length" refers to the time required for one cycle, and one cycle refers to one cycle of signal display.

"Split" in the above item is the ratio of the length of time allocated to each presentation to the cycle length. Note that the present term is a right of way given simultaneously to a certain set of traffic flows at one intersection or a time zone in which the right of way is assigned. Therefore, in the case of an intersection where a main road and a secondary road intersect, it is set for each of the main road and the secondary road.
Among the above items, the "offset reference time" is the reference time for measuring the number of offset seconds. The time obtained by adding the number of offset seconds and the multiple of the cycle length to the offset reference time is the rise of the first stage.
Among the above items, "offset" refers to the deviation from a reference time point common to the group of traffic lights at a certain time point of signal display, for example, the start time of a green light on a main road, or the start of the same display between adjacent intersections in system control or regional control. Refers to point deviation.
Among the above items, "the number of seconds for steps 1, 2, . . . N" is the number of seconds for each step.

As shown in FIG. 6, the receiving side database 42 is provided with fields for registering items corresponding to the respective items of the signal control command 40, and the contents of the received signal control command 40 are registered. be able to.
Each signal control command 40 that has been received in the past is registered in the receiving side database 42 in association with the date and time of reception and the type of day (day of the week).
For example, a plurality of signal control commands 40 received in the past one week are accumulated in the receiving side database 42 .

As shown in FIG. 4, when the received signal control command 40 is registered in the receiving side database 42 (step S4), the control section 14 proceeds to step S5, executes normal processing, and returns to step S1.
If it is determined in step S3 that the signal control command 40 is not received, the control unit 14 proceeds to step S5, executes normal processing, and returns to step S1.

FIG. 7 is a flowchart showing an example of normal processing.
The control unit 14 that executes normal processing proceeds to step S11, and depending on whether the determination result in step S3 in FIG. Either is selected (step S11).
If the determination result in step S3 indicates that the signal control command 40 has been received from the central device 6, the control unit 14 proceeds to step S12 and performs signal control based on the received signal control command 40 (step S12 ) to end the process.

On the other hand, if the determination result in step S3 is that the signal control command 40 from the central device 6 has not been received, the control unit 14 proceeds to step S13, maintains the current signal control (step S13), Finish processing.

Thereby, the control unit 14 performs signal control based on the latest signal control command 40 transmitted from the central unit 6 in normal processing.

In FIG. 4, when it is determined in step S1 that a communication failure has occurred with the central device 6, the control unit 14 proceeds to step S2, performs non-receipt processing, and returns to step S1.

FIG. 8 is a flowchart illustrating an example of non-reception processing.
The control unit 14 that executes the non-receipt process advances to step S15, and selects the signal control command 40 corresponding to the current date type and time from among the plurality of signal control commands 40 accumulated in the receiving side database 42. , is referred to (step S15).

More specifically, the control unit 14 selects the signal control command 40 received at the date type and time corresponding to the current date type and time from among the plurality of signal control commands 40 accumulated in the receiving side database 42. Select and browse.
Note that the type of day refers to a day or a period in which the temporal changes in the traffic characteristics of the day show the same pattern from the viewpoint of traffic control. There are three types of standard days: weekdays, Saturdays, and holidays. Other day types may be classified according to specific days of the week, or according to the weather.

Here, the control unit 14 of the present embodiment receives the signal control command at the same time on the same day of the week one week before the present as the signal control command received at the date type and time corresponding to the current day type and time, or at the time just before the current day type and time. The received signal control command 40 is selected from the receiving side database 42 and referred to.

As shown in FIG. 8, the control unit 14 performs signal control based on the signal control command 40 referred to in step S15 (step S16), and finishes the process.
Thereby, the control unit 14 performs signal control based on the signal control command 40 stored in the storage unit 20 in the non-reception processing.

In this manner, the control unit 14 switches the control of the signal lamp device 2 between normal processing and non-receiving processing depending on whether or not communication failure has occurred with the central device 6 .
In addition, the control unit 14 of the traffic signal controller 4 switches the processing so that when a communication failure occurs with the central unit 6, the information is registered in the receiving side database 42 stored in the storage unit 20. The signal lamp device 2 is controlled based on the signal control command 40 corresponding to the current date type and time among the signal control commands 40 of the own machine 4 .

[Transmission processing of signal control command by central device 6]
FIG. 9 is a flowchart showing an example of processing for transmitting the signal control command 40 performed by the control unit 22 of the central device 6. As shown in FIG.

The control unit 22 first determines whether or not the traffic signal controllers 4 in the area under its jurisdiction include a traffic controller 4 that is experiencing communication failure with its own device 6 ( step S20).
When it is determined in step S20 that the traffic signal controller 4 with which communication failure has occurred with the own device 6 is not included in the area under its jurisdiction, the control unit 22 performs normal transmission of the signal control command 40 ( Step S22), and return to step S20 again.

Normal transmission is a process of transmitting the latest signal control command 40 generated by the control unit 22 based on current traffic information and the like to each traffic controller 4 .
In this case, each traffic controller 4 maintains normal processing (FIG. 7).

When it is determined in step S20 that the traffic signal controller 4 with which communication failure has occurred with the own device 6 is included in the jurisdiction area, the control unit 22 proceeds to step S23 and maintains the system control. (step S23), and the process returns to step S20.

FIG. 10 is a flowchart illustrating an example of maintenance processing.
The control unit 22 that executes maintenance processing first identifies the traffic signal controller 4 in which communication failure has occurred, and performs maintenance processing based on the position of the intersection where the traffic signal controller 4 in which communication failure has occurred is installed. is specified (step S24).
In the following description, the traffic signal controller 4 with which communication failure has occurred with the central device 6 is also referred to as the disconnection controller 4A.

The control unit 22 of the present embodiment targets the traffic signal controllers 4 installed at the intersections Ci that form a sub-area including the intersection where the disconnection controller 4A is installed. The sub-area indicates the minimum unit of the intersection group that always gives the same cycle length.

The control unit 22 identifies the traffic controller 4 to be executed by the controller ID assigned to each traffic controller 4 .

Next, the control unit 22 selects the signal control command 40 transmitted to the cutting control device 4A from the transmission side database 46 stored in the storage unit 28, which corresponds to the current date type and time. 40 is selected and referred to (step S25).
More specifically, the control unit 22 selects the signal control command 40 transmitted from the transmission side database 46 to the cutting controller 4A, which is the signal transmitted at the date type and time corresponding to the current date type and time. A control command 40 is selected and referenced.

As described above, the control unit 22 registers the transmitted signal control commands 40 transmitted from the own device 6 to each traffic controller 4 in the transmission side database 46 .
FIG. 11 is a diagram showing an example of the transmission side database 46 stored in the storage unit 28 of the central device 6. As shown in FIG.

As shown in FIG. 11, the transmission-side database 46 is provided with columns for registering items corresponding to each item of the signal control command 40. can be accumulated every four.

Each signal control command 40 that has been transmitted in the past is registered in the transmission side database 46 in association with the date and time of transmission and the type of day (day of the week).
For example, a plurality of signal control commands 40 transmitted in the past one week are stored in the transmission side database 46 .

Further, in the transmission side database 46, each transmitted signal control command 40 is registered in association with the controller ID. As a result, the signal control commands 40 transmitted by the traffic controllers 4 within the jurisdiction area can be registered in the transmitter database 46 for each traffic controller 4 .

In step S25 of FIG. 10, the control unit 22 associates the controller ID of the cutting controller 4A with the controller ID of the cutting controller 4A from among the plurality of signal control commands 40 accumulated in the transmission-side database 46, and sets the controller ID to one week from the present. The signal control command 40 transmitted at the same time on the same day of the previous day or immediately before is selected as the signal control command 40 transmitted at the date type and time corresponding to the current day type and time, and is referred to.

Next, the control unit 22 advances to step S26, and based on the referenced signal control command 40 (already transmitted signal control command 40 transmitted to the cutting controller 4A), the signal control unit 22 transmits to the peripheral controller 4B. A command 40 is generated (step S26).
In addition, the peripheral controller 4B means the traffic controller 4 other than the disconnect controller 4A among the traffic controllers 4 to be executed.

The signal control command 40 for the peripheral controller 4B generated in step S26 is based on the premise that the cutting controller 4A is executing control according to the signal control command 40 that has already been transmitted to the cutting controller 4A. , are generated as control contents that can realize system control by the cutting controller 4A and the peripheral controller 4B as a whole.

Next, the controller 22 proceeds to step S27, transmits the generated signal control command 40 to the peripheral controller 4B (step S27), and finishes the process.
The peripheral controllers 4B that have received the signal control commands 40 transmitted in step S27 perform signal control based on the received signal control commands 40, respectively.

In this way, the control unit 22 of the central unit 6 selects the signal control command 40 for the peripheral controller 4B according to the selection policy similar to the selection policy when each traffic controller 4 selects the signal control command 40 used in the non-receipt process. A signal control command 40 used for generating the control command 40 is selected.
Thereby, the control section 22 of the central device 6 can grasp the signal control executed by the cutting controller 4A, and can appropriately control the peripheral controller 4B according to the control of the cutting controller 4A.

[Regarding a specific example of signal processing when there is a cutting controller in the first embodiment]
FIG. 12 is a diagram for explaining the operation of each traffic controller 4 and the central device 6 when the communication of one traffic controller 4 is cut off in the system of the first embodiment.

In FIG. 12, intersections where traffic controllers 4a, 4b, 4c, 4d, 4e, 4f, and 4g are installed are located in section R where system control is performed.
Each intersection where the traffic controllers 4a, 4b, 4c, 4d and 4e are installed constitutes one sub-area A1, and each intersection where the traffic controllers 4f and 4g are installed constitutes a sub-area. It constitutes one sub-area A2 different from A1.

Here, the case where the traffic signal controller 4b installed at the intersection in the sub-area A1 is disconnected from the central unit 6 for some reason such as a change in the radio wave propagation path will be described.

When the communication with the central device 6 is cut off in the traffic controller 4 b , the traffic controller 4 b cannot receive the signal control command 40 from the central device 6 . Therefore, when a predetermined time has passed since the signal control command 40 was received last time, the traffic controller 4b determines that the communication is defective, and executes the non-receipt processing.

Here, it is assumed that the current date and time during which the traffic controller 4b is determining communication failure is Wednesday, August 28, 2018, at 10:11:00 am.
Further, in the receiving side database 42 of the traffic signal controller 4b, as shown in FIG. Assume that the signal control command 40 received after this signal control command 40 is registered as the signal control command 40 received on Wednesday, August 21, 2018 at 10:12:00 am. .

As described above, the traffic signal controller 4b of the present embodiment, among the signal control commands 40 accumulated in the receiving side database 42, receives the signal received at the same time on the same day of the week one week before the present or immediately before. The control command 40 is referred to, and signal control is performed based on the referred signal control command 40 .

Therefore, the traffic controller 4b refers to the signal control command 40 stored in the receiving side database 42 and received at "10:10:00 AM, Wednesday, August 21, 2018". Signal control is performed based on the signal control command 40 .
Further, when the current date and time reaches Wednesday, August 28, 2018, 10:12:00 am, the traffic controller 4b determines that the received date and time is "Wednesday, August 21, 2018, 10:12 am The signal control command 40 of "minute 00 second" is referred to, and signal control is performed based on this signal control command 40.
In this manner, the traffic controller 4b refers to the signal control command 40 corresponding to the current day type and time as time elapses, and performs signal control based on this signal control command 40. FIG.

On the other hand, when the central device 6 detects that communication with the traffic controller 4b has been cut off and communication failure has occurred with the traffic controller 4b, the central device 6 performs maintenance processing.

The central device 6 of the present embodiment first identifies an execution target of the maintenance process. In FIG. 12, the intersection where the traffic controller 4b, which is the disconnect controller 4A, is installed is included in the sub-area A1. Therefore, the central device 6 specifies the traffic signal controllers 4a, 4b, 4c, 4d, and 4e installed at the intersections included in the sub-area A1 as objects to be executed.

Next, the central unit 6 transmits the signal control command 40 stored in the transmitting side database 46 to the traffic signal controller 4b (cutting controller 4A) at the same time on the same day of the week one week before the current time or immediately before. The signal control command 40 is referred to. Then, the central device 6 generates a signal control command 40 to be transmitted to the traffic controllers 4a, 4c, 4d, 4e (peripheral controller 4B) based on the signal control command 40 referred to.

Here, it is assumed that the current date and time is Wednesday, August 28, 2018 at 10:11:00 am, as described above.
Further, in the transmission side database 46, as shown in FIG. 11, as the signal control command 40 associated with the controller ID of the traffic controller 4b, the transmission date and time is "August 21, 2018, Wednesday, morning 10:10:00”, and the signal control command 40 transmitted next to this signal control command 40 with a transmission date and time of “Wednesday, August 21, 2018, 10:12:00 a.m. is registered as a signal control command 40.

Therefore, in this case, the central device 6 is associated with the controller ID of the traffic controller 4b stored in the transmission side database 46, and the transmission date and time is "August 21, 2018, Wednesday, 10:00 AM. The signal control instruction 40 at "10:00" is referred to. Then, the central device 6 transmits signal control signals to the traffic controllers 4a, 4c, 4d, and 4e based on the referenced signal control command 40 (the signal control command 40 transmitted to the traffic controller 4b). Generate directive 40 .

The central device 6 generates signal control commands 40 for the traffic controllers 4a, 4c, 4d, and 4e based on the signal control commands 40 already transmitted to the traffic controllers 4b to the traffic controllers 4a, 4c, and 4d. , 4e.

The traffic controllers 4a, 4c, 4d, and 4e, which are the peripheral controllers 4B whose communication is not cut off, perform signal control based on the signal control command 40 received.
Furthermore, when the current date and time reaches Wednesday, August 28, 2018 at 10:12:00 am, the central device 6 associates the controller ID of the traffic controller 4b with the transmission date and time. The signal control command 40 of “Wednesday, August 21, 2018, 10:12:00 am” is referred to, and signal control is performed based on this signal control command 40 .
In this way, the central device 6 refers to the signal control command 40 of the cutting controller 4A corresponding to the current date type and time as time elapses, and based on this signal control command 40, the peripheral controller 4B A signal control command 40 directed to the peripheral controller 4B is generated and transmitted to the peripheral controller 4B.

As described above, in this embodiment, the traffic signal controller 4b, which is the disconnect controller 4A, performs signal control based on the signal control command 40 received in the past. Controllers 4a, 4c, 4d, and 4e perform signal control based on signal control commands 40 generated based on signal control commands 40 transmitted to traffic controller 4b in the past.

Incidentally, the traffic controllers 4f and 4g installed at the intersection of sub-area A2 maintain normal processing. The central unit 6 also maintains normal transmission to the traffic controllers 4f, 4g.

According to the system 1 configured as described above, even if the traffic signal controller 4b with which communication failure has occurred is included in the plurality of traffic controllers 4, the traffic signal controller 4b with which communication failure has occurred Since the signal lamp device 2 is controlled based on the signal control command 40 corresponding to the current time in the receiving side database 42 possessed by the traffic controller 4b, the signal control executed in the past with the same day type and time as the current time. to run. As a result, it is possible to execute the control that was executed in the past traffic conditions similar to the current traffic conditions, and to appropriately perform the signal control.

Also, the central device 6 of this embodiment can obtain the signal control command 40 currently used by the cutting controller 4A. Furthermore, since the signal control command 40 for the peripheral controller 4B is generated based on the signal control command 40 currently used by the cutting controller 4A, the signal control for the peripheral controller 4B is changed to the signal control for the cutting controller 4A. We can do better together. As a result, the system control between the cutting controller 4A and the peripheral controller 4B can be maintained more appropriately.

In addition, in this embodiment, the peripheral controller 4B is centrally controlled by the signal control command 40 from the central device 6. Therefore, even if the communication failure of the cutting controller 4A continues for a long period of time, it can be handled flexibly. is possible, and appropriate signal control can be maintained over a long period of time.

Furthermore, the central device 6 of the present embodiment targets the traffic controllers 4 installed at the intersections Ci, which form a sub-area including the intersection where the disconnection controller 4A is installed, for maintenance processing.
In other words, each intersection Ci in which the disconnection controller 4A and the peripheral controller 4B are installed constitutes one sub-area A1 within the section of system control, so the traffic signal controller that executes signal control with the same cycle length. 4 can be appropriately signal controlled.

In this embodiment, the traffic controller 4b, which is the disconnection controller 4A, is based on the signal control command 40 selected from among the signal control commands 40 registered in the receiving side database 42 of its own device 4. , cycle control, split control, offset control, and terminal sensitive control.

On the other hand, the traffic signal controllers 4a, 4c, 4d, and 4e, which are the peripheral controllers 4B, may execute cycle control and offset control based on the signal control command 40 transmitted from the central device 6. Control and terminal-sensitive control may be executed based on the measurement results from the roadside sensors 8 connected to each traffic controller 4, or based on the signal control command 40 transmitted from the central unit 6. may be executed.

[Regarding restoration of execution history]
The system 1 has a function of accumulating the contents of signal control actually executed by each traffic controller 4 as a history.
The history accumulation function is performed by each traffic controller 4 transmitting signal control execution information to the central device 6 and the central device 6 registering it in the execution history database 51 .
Therefore, if a communication failure occurs between the traffic controller 4 and the central device 6, part of the information in the execution history database 51 will be lost.
The present system 1 has a function of performing restoration processing for restoring information in this missing execution history database 51 .

FIG. 13 is a sequence diagram illustrating an example of restoration processing. FIG. 13 focuses on the processing between one traffic controller 4 and the central device 6 , but the central device 6 executes the same processing as each traffic controller 4 .

First, in FIG. 13, the traffic signal controller 4 generates signal control execution information indicating the content of the control of the signal lamp device 2 executed by the own machine 4, and registers it in the execution information database 49 of the storage unit 20 of the own machine 4. (step S30). Next, the traffic controller 4 transmits the generated signal control execution information to the central device 6 (step S31).

FIG. 14 is a diagram showing an example of signal control execution information transmitted by the traffic controller 4. As shown in FIG.
FIG. 14 shows part of the signal control execution information 50. As shown in FIG.
Among the items included in the signal control execution information 50, the "transmission date and time" indicates the start date and time (year, month, day, hour, minute, second) and the end date and time (year, month, day, hour, minute, second) of the transmission of the signal control execution information. "Cycle start time" is the start time of the current cycle.
Among the above items, the "control execution type" is information indicating the status used for remote operation, manual operation, independent operation, security operation, flashing operation, etc., and information indicating history operation is also included.
Among the above items, the "sensible execution type" is information indicating FAST control, recall control, gap sensitive control, etc., which the terminal device operates based on the sensitive permission signal.
Among the above items, the "split fluctuation value" is the number of seconds extended or shortened from the reference number of seconds when the sensory control is executed based on the sensory permission signal described above.

Among the above items, "execution offset" indicates the value of the actually executed offset.
Among the above items, "the number of seconds for steps 1, 2, . . . N" is the number of seconds for each step actually executed.
Among the above items, the "planned cycle length" indicates the cycle length that the traffic controller is going to execute.
Among the above items, "automatic generation result" is calculated by a function that automatically generates cycle and split as well as calculating traffic volume and occupancy time per unit time for each vehicle detector based on information from vehicle detectors. This is the result of
Among the above items, "sensor information" indicates the measurement result from the roadside sensor 8. FIG.
Among the above items, "operation status information" indicates information such as remote operation status, lamp color abnormality, and clock abnormality.
Among the above items, “speed measurement information” is information indicating the speed of the vehicle 5 measured by the roadside sensor 8 .

The traffic controller 4 generates the signal control execution information 50, registers the generated signal control execution information 50 in the execution information database 49 of the storage unit 20 of the own machine 4, and registers the generated signal control execution information 50. Send to central unit 6 .
Upon receiving the signal control execution information 50, the central device 6 registers the received signal control execution information 50 in the execution history database 51 stored in the storage unit 28 of its own device 6 (step S32).

In the execution history database 51 of the central device 6, the signal control execution information 50 is accumulated in association with the controller ID of each traffic controller 4 within the jurisdiction area. The signal control execution information 50 of each traffic controller 4 is continuously registered in the execution history database 51 .
Therefore, in principle, a plurality of pieces of signal control execution information 50 are registered in the execution history database 51 such that the pieces of signal control execution information 50 are consecutive without loss.
The execution history database 51 is used to manage the history of control actually executed by the traffic controller 4 .

When registering the signal control execution information 50 in the execution history database 51, the central device 6 changes the contents of the "transmission date and time" in the item of the signal control execution information 50 to the reception date and time when the signal control execution information 50 is received. change and register.

As shown in FIG. 13, the traffic controller 4 repeats generation, registration, and transmission of the signal control execution information 50 as needed (steps S33, S34). 50 is registered in the execution history database 51 at any time (step S35).

Next, after step S35, communication failure occurs between the traffic controller 4 and the central unit 6 (step S36), and then communication is restored (step S38).
In this case, the traffic controller 4 continues to generate the signal control execution information 50 and register the signal control execution information 50 in the execution information database 49 during the disconnection period from the occurrence of the communication failure to recovery. (step S37).

However, the traffic controller 4 cannot transmit the signal control execution information 50 because communication failure has occurred with the central device 6 .
Therefore, the central device 6 cannot receive the signal control execution information 50 generated during the disconnection period, and the signal control execution information 50 during the disconnection period is lost in the execution history database 51 .

When the signal control execution information 50 is lost in the execution history database 51 and the continuity over time of the execution history database 51 is impaired, the central unit 6 determines the period during which the signal control execution information 50 is lost (predetermined period) to the traffic controller 4 (step S39). When the central device 6 determines that a communication failure has occurred and the temporal continuity of the execution history database 51 has been lost, the central device 6 transmits the transmission request, but the temporal continuity of the execution history database 51 is lost. It is also possible to display the fact on the display unit 24 and output it to the operator, and to transmit the transmission request by receiving the operator's input through the operation unit 30 .
The transmission request includes information indicating a period (disconnection period) during which the execution history database 51 of the central device 6 is missing.

The traffic controller 4 that has received the transmission request generates loss compensation information (step S40). The loss compensation information is information including the signal control execution information 50 generated during the disconnection period among the plurality of signal control execution information 50 registered in the execution information database 49 .

FIG. 15 is a diagram showing an example of loss compensation information transmitted by the traffic controller 4. As shown in FIG.
FIG. 15 shows part of the loss compensation information 52. As shown in FIG.
Among the items included in the loss compensation information 52, the “transmission date and time” indicates the start date and time (year, month, day, hour, minute, second) and the end date and time (year, month, day, hour, minute, second) of the loss compensation information 52. FIG.
The loss compensation information 52 includes items similar to those of the signal control execution information 50 .
Another item, "repair date and time", is the date and time (year, month, day, hour, minute, second) when the loss compensation information 52 is given to the central device 6, registered in the execution history database 51, and the loss is repaired. It is written by the central unit 6 that receives the missing compensation information 52 .
“Probe information” is probe information of the vehicle 5 collected by the roadside sensor 8 connected to the traffic controller 4 . Traffic controller 4 accumulates probe information from roadside sensors 8 during disconnection periods. The traffic controller 4 transmits the loss compensation information 52 including the probe information accumulated during the disconnection period.

When the traffic controller 4 generates the loss compensation information 52, it transmits it to the central device 6 (step S41).
The central device 6 that has received the loss compensation information 52 restores the execution history database 51 using the loss compensation information 52 . At this time, the central device 6 changes the contents of the item "transmission date and time" of the loss compensation information 52 to the reception date and time when the loss compensation information 52 is received and registers it.
Further, the central device 6 writes the date and time when the execution history database 51 was repaired by the loss compensation information 52 in the "repair date and time".

The probe information included in the loss compensation information 52 is used by the central device 6 to generate traffic information.

Thus, in this embodiment, each traffic controller 4 generates the signal control execution information 50 and accumulates it in the execution information database 49 of the storage unit 20 of the own machine 4 .
Further, the central device 6 sends a transmission request requesting transmission of the signal control execution information 50 during the disconnection period (predetermined period) among the plurality of signal control execution information 50 registered in the execution information database 49 to the traffic signal controller. 4 to transmit the signal control execution information 50 for a predetermined period to the traffic controller 4 as loss compensation information 52 .
As a result, the central unit can acquire the execution information of the traffic controller during the communication failure as the execution history, and can restore the missing part of the execution history database 51 .

[Regarding the second embodiment]
FIG. 16 is a flowchart showing an example of maintenance processing executed by the central device 6 of the system according to the second embodiment.
The present embodiment differs from the first embodiment in that the maintenance process executed by the central device 6 is the process of stopping the transmission of the signal control command 40 to the peripheral controller 4B.

As in the first embodiment, (the control unit 22 of) the central device 6 of the present embodiment first identifies the disconnection controller 4A in which communication failure has occurred, and the traffic signal controller to be subjected to maintenance processing. 4 is specified (step S24).
Also in the present embodiment, the central device 6 subjects the traffic signal controllers 4 installed at the intersections Ci constituting the sub-area including the intersection where the disconnection controller 4A is installed to the maintenance process.

Next, the central device 6 stops transmitting the signal control command 40 to each traffic controller 4 installed at the intersection Ci constituting the sub-area including the cutting controller 4A (step S28), and finishes the process.

At this time, the peripheral controller 4B included in the sub-area determines that a communication failure has occurred with the central device 6, and therefore executes the non-receipt processing similarly to the disconnection controller 4A.
The traffic signal controller 4 refers to the signal control command 40 corresponding to the current day type and time in the non-reception process, and performs signal control based on this signal control command 40 .

At this time, the cutting controller 4A and the peripheral controller 4B perform signal control based on the signal control command 40 received at the same timing in the past.
Therefore, the cutting controller 4A and the peripheral controller 4B reproduce the signal control executed at the same timing in the past, and system control can be maintained.

[Regarding a specific example of signal processing when there is a cutting controller in the second embodiment]
FIG. 17 is a diagram for explaining the operation of each traffic controller 4 and the central device 6 when the communication of one traffic controller 4 is cut off in the system of the second embodiment.

FIG. 17 shows traffic controllers 4a, 4b, 4c, 4d, 4e, 4f, and 4g installed at intersections located in section R where system control is performed, as in FIG.
Each intersection where the traffic controllers 4a, 4b, 4c, 4d and 4e are installed constitutes one sub-area A1, and each intersection where the traffic controllers 4f and 4g are installed constitutes a sub-area. It constitutes one sub-area A2 different from A1.

Here, the case where the traffic signal controller 4b installed at the intersection in the sub-area A1 is disconnected from the central unit 6 for some reason such as a change in the radio wave propagation path will be described.

As in the case of FIG. 12, assume that the current date and time during which the traffic controller 4b is determining communication failure is Wednesday, August 28, 2018, at 10:11:00 am.
In addition, as shown in FIG. 6, in the receiving side database 42 of each traffic controller 4a, 4b, 4c, 4d, 4e, the reception date and time is "Wednesday, August 21, 2018, 10:10 am. and a signal control command 40 received next to this signal control command 40, the signal control command 40 having a reception date and time of “Wednesday, August 21, 2018, 10:12:00 am”. and are registered.

In this case, the traffic signal controller 4b, which is the disconnection controller 4A, executes the non-receipt processing, and the reception date and time accumulated in the reception side database 42 is "Wednesday, August 21, 2018, 10:10 am. The signal control command 40 of "minute 00 second" is referred to, and signal control is performed based on this signal control command 40.

At this time, when the central device 6 determines that a communication failure has occurred with the traffic controller 4b, it issues a signal control command to the traffic controllers 4a, 4c, 4d, and 4e, which are the peripheral controllers 4B. 40 transmission is stopped.
Therefore, the traffic signal controllers 4a, 4c, 4d, and 4e, like the traffic signal controller 4b, execute non-receipt processing, and the reception date and time stored in the respective receiving side databases 42 are "August 2018. 21, Wednesday, 10:10:00 a.m.”, and signal control is performed based on this signal control command 40.

In this case, the traffic signal controllers 4a, 4c, 4d, and 4e, which are the peripheral controllers 4B, stop transmitting the signal control command 40, so that the traffic controller 4b, which is the disconnect controller 4A, is centrally It determines that a communication failure has occurred with the device 6, and executes signal control based on the signal control command 40 corresponding to the current date type and time. As a result, it is possible to reproduce the signal control executed in the past at each intersection on the same date and time as the current one, and to maintain the system control.

In the second embodiment, when the execution target is specified, the central device 6 stops sending the signal control command 40 to the peripheral controller 4B in step S28. An operator for outputting to the display unit 24 a display indicating the traffic signal controller 4 corresponding to the peripheral controller 4B to stop the transmission of 40, and further stopping the transmission of the signal control command 40 to the peripheral controller 4B. By receiving the input by the operation unit 30, the transmission of the signal control command 40 to the peripheral controller 4B may be stopped.

[Management of time information by the start time of each step]
As shown in FIG. 14, the format of the signal control execution information 50 includes "cycle start time" and "scheduled cycle length" for cycles, but steps 1, 2, . . . number" is to be sent.
In this case, the value of the number of seconds described in each step 1, 2, . . . Therefore, the total number of seconds of all steps included in the cycle may not match the number of seconds of the cycle length, and the central unit 6 may not be able to obtain accurate signal control execution information 50 .

Therefore, for the format of the signal control execution information 50, one of the following patterns should be adopted instead of the "number of seconds" in steps 1, 2, . . . This makes it possible to reduce the cumulative error associated with rounding.
・Pattern 1
"Start time" of each step 1, 2 ... N
・Pattern 2
"Start time" of step 1 and "Cumulative number of seconds from the "start time" of step 1 to the start of each step

・Pattern 3
"Start time" of step 1 and "Cumulative number of seconds from the "start time" of step 1 to the end of each step"
Here, the "start time" indicates hours, minutes, and seconds (the number of seconds is in units of 1 second or 0.1 second), and the "cumulative number of seconds until the start" and the "cumulative number of seconds until the end" is marked with a second value such as 1 second unit or 0.1 second unit, respectively.

For example, assuming that the cycle start time is "10:00:00", the time length of the first step is "40 seconds", and the time length of the second step is "5 seconds", pattern 2 and The signal control execution information 50 based on 3 is as follows.

In the case of pattern 2 (cumulative number of seconds from the start time of step 1 to the start of each step)
Cycle start time: 10:00:00
1st step start: 0 seconds 2nd step start: 40 seconds 3rd step start: 45 seconds

In the case of pattern 3 (cumulative number of seconds from the start time of step 1 to the end of each step)
Cycle start time: 10:00:00
End of 1st step: 40 seconds End of 2nd step: 45 seconds

It should be noted that not only the signal control execution information 50 but also the format of the signal control command 40 shown in FIG. can be
Also, when adopting any of the above three patterns, absolute It is preferred to employ the time of day. In this way, even if the same step continues for a long period of time, the start time of each step can be accurately identified.

From the traffic signal controller 4, as the operation status every second, the presence or absence of a recall, lights off, power failure generator operation (if equipped with a generator), door open/closed status (if equipped with a door open/close detection function), etc. are sent. Sometimes.
These information transmissions are executed in units of one second when communication with the traffic control center is maintained. You may decide to send it in a format.

In this way, the central device 6 can grasp the start and end of the event (for example, the start year, month, day, hour, minute, and second of turning off the lights and the year, month, day, hour, minute, and second of the end).
In particular, when the communication between the traffic control center and the traffic signal controller 4 is interrupted, it is possible to accurately grasp the event recovery time during the disconnection of the line at a later date.

〔others〕
It should be noted that the embodiments disclosed this time should be considered as examples in all respects and not restrictive.
For example, in the above-described first and second embodiments, the central device 6 maintains the traffic controller 4 installed at the intersection Ci, which constitutes a sub-area including the intersection where the disconnection controller 4A is installed. Although the case where the execution target is exemplified, the execution target can be the traffic signal controller 4 of the intersection Ci located within a predetermined range with respect to the intersection Ci where the disconnection controller 4A is installed.

That is, each intersection Ci at which the peripheral controller 4B is installed is located within a predetermined range with reference to the intersection Ci at which the disconnection controller 4A is installed within the system control section.
As a result, the traffic signal controller 4 adjacent to the disconnection controller 4A within the system control section can be used as the peripheral controller 4B.

Further, the predetermined range defining the intersection Ci where the peripheral controller 4B is installed is the range from the intersection Ci where the cutting controller 4A is installed to the intersection Ci located before the important intersection adjacent to the intersection Ci. There may be.
An important intersection is an intersection that serves as a reference for determining signal control parameters of related intersections in system control or area control. In areas with high traffic demand, intersections are bottlenecks in terms of traffic capacity.

FIG. 18 is a diagram for explaining another example of specifying an execution target. FIG. 18 shows a case where an important intersection is included in section R where system control is performed.
In FIG. 18, it is assumed that an intersection Ci at which traffic controllers 4h and 4n are installed is an important intersection.
Further, the intersections where the traffic controllers 4h, 4i, 4j, and 4k are installed constitute one sub-area A3, and the intersections where the traffic controllers 4l and 4m are installed are sub-areas A3. It constitutes one sub-area A4 different from.

In the example of FIG. 18, the central device 6 is a traffic signal controller installed within a range from the intersection Ci where the disconnection controller 4A is installed to the intersection Ci located in front of the important intersection adjacent to the intersection Ci. 4 is to be executed.

Here, it is assumed that a communication failure occurs between the traffic controller 4k installed at the intersection in the sub-area A3 and the central device 6. FIG.

In this case, the central unit 6 executes the traffic controllers 4i, 4j, 4k, 4l, 4m located in the range between the traffic controllers 4h, 4n, which are the important intersections, regardless of the sub-areas A3, A4. set to target.
Also in this configuration, system control can be maintained, and signal control can be performed appropriately.

Further, in each of the above embodiments, the control unit 14 of the traffic controller 4 searches the receiving side database 42 for the signal control command 40 that was received at the same time on the same day of the week one week before the current time or just before. , exemplified the case of reference. In other words, the case where the day of the week is used as the unit for determining whether or not the day type corresponds is exemplified, but the day type corresponding to the current day type is determined in three units of weekdays, Saturdays, and holidays. may

Further, in each of the above-described embodiments, the case where each traffic controller 4 and the central device 6 perform wireless communication with each other by a mobile communication system was exemplified, but communication between each traffic controller 4 and the central device 6 is not limited to wireless communication, but may be communication using a wired line such as a wired LAN or a wired telephone line.

The scope of the present invention is indicated by the scope of the claims rather than the above-described meaning, and is intended to include meanings equivalent to the scope of the claims and all modifications within the scope.

1 Traffic signal control system 2 Traffic light device 4 Traffic signal controller 4a, 4b, 4c, 4d, 4e, 4f, 4g Traffic signal controller 4h, 4i, 4j, 4k, 4l, 4m, 4n Traffic signal controller 4A Cutoff control Machine 4B Peripheral controller 5 Vehicle 6 Central device 8 Roadside sensor 10 Roadside communication device 14 Control unit 16 Lamp drive unit 18 Communication unit 20 Storage unit 22 Control unit 24 Display unit 26 Communication unit 28 Storage unit 30 Operation unit 40 Signal control command 42 Receiving side database 46 Sending side database 49 Execution information database 50 Signal control execution information 51 Execution history database 52 Compensation information A1 Subarea A2 Subarea A3 Subarea A4 Subarea

Claims (11)

A plurality of traffic signal controllers installed at each intersection included in the section of system control,
A traffic signal control system comprising a central device that notifies the plurality of traffic signal controllers of a signal control command for system control,
The central device is
a higher side control unit that generates the signal control command for each of the plurality of traffic signal controllers;
a higher side communication unit that transmits the generated signal control command to each of the plurality of traffic controllers;
The plurality of traffic signal controllers are
a lower communication unit that receives the signal control command of its own device;
a lower side control unit that controls a signal lamp device based on the received signal control command;
a lower-side storage unit for storing lower-side accumulated data, which is a data group in which the received signal control commands of its own device are accumulated,
The lower side control unit
When a communication failure occurs with the central unit, the signal lamp based on the signal control command corresponding to the current date type and time among the signal control commands of the own device included in the lower-side accumulated data. A traffic signal control system that controls the instrument. The central device is
2. The traffic signal control system according to claim 1, further comprising a host side storage unit for storing host side accumulated data, which is a data group in which the transmitted signal control commands are accumulated for each of the plurality of traffic signal controllers. The host side control unit,
When the following cutting controller is detected, the signal control command of the cutting controller corresponding to the current day type and time is extracted from the signal control commands of the cutting controller contained in the upper-level accumulated data. death,
3. The traffic signal control system according to claim 2, wherein the following signal control commands for peripheral controllers are generated based on the extracted signal control commands for the cutting controller.
Disconnection controller: Traffic signal controller with which communication failure has occurred with the central unit Peripheral controller: Traffic signal controller that is included in the same system control section as the disconnection controller and is communicating with the central unit The host side control unit,
3. The traffic signal control system according to claim 1 or 2, wherein the transmission of the signal control command to the following peripheral controllers is stopped when the following disconnection controller is detected.
Disconnection controller: Traffic signal controller with which communication failure has occurred with the central unit Peripheral controller: Traffic signal controller that is included in the same system control section as the disconnection controller and is communicating with the central unit 5. The traffic signal control system according to claim 3 or 4, wherein each intersection at which said cutting controller and said peripheral controller are installed constitutes one sub-area within said section. 5. The traffic signal control system according to claim 3 or 4, wherein each intersection where the peripheral controller is installed is located within a predetermined range with respect to the intersection where the disconnection controller is installed in the section. . 7. The traffic signal control system according to claim 6, wherein said predetermined range is a range from the intersection where said cutting controller is installed to an intersection located before an important intersection adjacent to said intersection. The plurality of traffic signal controllers,
generating execution information indicating the control of the signal lamp device executed by the own device and storing the execution information in the lower storage unit;
The central device is
A transmission request is transmitted to at least one traffic controller among the plurality of traffic controllers, requesting transmission of the execution information generated in a predetermined period from among the execution information accumulated in the lower storage unit. 8. The traffic signal control system according to any one of claims 1 to 7, wherein the execution information for the predetermined period is transmitted to the one traffic controller. Traffic signal control performed by a plurality of traffic signal controllers respectively installed at intersections included in a section of system control, and a central device for notifying the plurality of traffic signal controllers of signal control commands for system control. a method,
the central unit generating the signal control commands for each of the plurality of traffic controllers;
sending the generated signal control command to each of the plurality of traffic controllers;
the traffic controller receiving the signal control command for its own vehicle;
the traffic controller controlling a traffic light device based on the received signal control command;
the traffic signal controller storing lower-side accumulated data, which is a data group in which the received signal control commands of the own machine are accumulated;
The step of the traffic controller controlling the signal lamp device based on the received signal control command includes, when a communication failure occurs with the central device, A traffic signal control method for controlling the traffic light device based on a signal control command corresponding to the current date type and time among the signal control commands. A traffic signal controller installed at an intersection included in a system control section,
a lower communication unit that receives a signal control command for system control;
a lower side control unit that controls a signal lamp device based on the received signal control command;
a lower-side storage unit for storing lower-side accumulated data, which is a data group in which the received signal control commands are accumulated;
The lower side control unit
When a communication failure occurs with the central unit that notifies the signal control command, based on the signal control command corresponding to the current date type and time among the signal control commands included in the lower-side accumulated data and a traffic signal controller for controlling the signal light device. A computer program for causing a computer to control a signal light device by a traffic signal controller installed at an intersection included in a section of system control,
to the computer,
receiving a signal control command for system control;
a step of controlling the signal lamp device based on the received signal control command;
A computer program for executing a step of storing lower-side accumulated data, which is a data group in which the received signal control commands are accumulated,
The step of controlling the signal lamp device based on the received signal control command includes:
When a communication failure occurs with the central unit that notifies the signal control command, based on the signal control command corresponding to the current date type and time among the signal control commands included in the lower-side accumulated data a computer program for controlling the signal light device.

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