KR100384561B1 - Task design method of communication control apparatus in traffic signal control system and control method using the same - Google Patents

Abstract

The present invention relates to a task design method of a communication control device of a traffic signal control system and a control method of a traffic signal control system using the same. The main technical configuration is, in more detail, in the method of designing a communication control device of a traffic signal control system comprising a signal control server, a communication control device and a traffic signal controller, the communication control device is a Recv task, Send task, Siot Designed as a task, shared memory (Common Memory), and characterized in that it is designed to receive the signal controller operating data, operator request data, communication control device signal planning data, intersection control information to the signal control server.

The present invention can more remotely manage the traffic signal controller management of the center of the signal system, and the control of the transmission and reception data for optimizing the signal plan information received through the traffic engineering algorithm performed in the signal control server of the signal system; By providing a management method, it is possible to optimize group control and supersaturation control in the city intersection.

Description

TASK DESIGN METHOD OF COMMUNICATION CONTROL APPARATUS IN TRAFFIC SIGNAL CONTROL SYSTEM AND CONTROL METHOD USING THE SAME}

The present invention relates to a traffic signal control system and a method thereof, and more particularly, a Recv task, a Send task, and a Siot task of a communication control device perform IPC communication using a system shared memory, and the Recv task and the Send task are local control. UDR / IP Lan communication with computer, Siot task serial communication with field signal controller, and based on this, communication control of traffic signal control system that enables real-time communication in seconds with field signal controller of more than 200 intersections An apparatus and a traffic signal control method using the same.

The related technologies of signal control system can be divided into three areas: traffic engineering, local device and central device. The traffic engineering sector is the control algorithm division, which is the core division of signal control, which is capable of understanding and analyzing traffic conditions and calculating signal variables. That is, an algorithm for processing the detection data from the detection device into logical data, an algorithm for judging traffic conditions using logical data, an algorithm for judging traffic conditions to create necessary signal control variables, and a signal time when a signal control variable changes. Time management algorithms such as extension and contraction can be considered as important technical factors.

The regional device sector includes technology elements such as video detection, loop detection, analog simultaneous control, one board analog and digital simultaneous control, serial and modem communications, and industrial computer manufacturing.

The central apparatus section includes a management section of the signal management server, a signal control server control section and a communication control device communications section.

The management part of the signal management server is a database management and data server production technology for real-time and static data such as huge amount of real-time data generated in real time and operation data management necessary for signal operation, operation history data management, traffic engineering control variable data management. Client / server application skills and network security skills are required.

The signal control server control section requires a technology for optimizing the signal plan by performing traffic engineering algorithms, and at the same time, a task management technique for guaranteeing calculation allowance time when performing calculations of several intersections.

Communication control device Communication part needs task management technology to guarantee calculation allowable time when requesting calculation of several intersections at the same time, and must perform second communication for all intersections. Especially, real-time control technology is very difficult and real time in communication control device. Communication technology was required. In addition, no matter how many hundreds of intersections the signal system has, the progress of signal presentation by mode intersections is managed in seconds. Therefore, the time of the local device is managed by the communication control device in the central center. If the time progress of the local device is wrong or the time is fixed at the center, the communication control device needs a real time local device time management technique that instructs the user to force the next action.

Accordingly, an object of the present invention is to provide a task management technique for guaranteeing a calculation allowable time when requesting calculation of several intersections in a communication section of a signal system and a high-frequency task design technique for performing second-second communication with several hundred intersections. By doing so, the traffic signal controller of the center of the signaling system can be managed more stably and remotely.

In addition, another object of the present invention is to provide a method of control and management of transmission and reception data for optimizing signal planning information received through a traffic engineering algorithm performed at a signal control server of a signal system, thereby controlling group control and supersaturation control of a city intersection. To optimize it.

1 is a configuration diagram schematically showing the configuration of a traffic signal control system to which the communication control device according to the present invention is applied;

2 is an explanatory diagram showing a task configuration of a communication control apparatus according to the present invention;

3 is a flowchart illustrating an operation of a control method of a traffic signal control system using a communication control device according to the present invention.

<Explanation of symbols for main parts of the drawings>

100: communication control device 101: Recv task

102: Siot Task 103: Send Task

104: shared memory 110: signal control server

120: signal management server 130: traffic signal controller

Features of the present invention for achieving the above objects,

In the design method of the communication control device of the traffic signal control system consisting of a signal control server, a communication control device and a traffic signal controller,

Design the communication control device as a Recv task, Send task, Siot task, shared memory (Common Memory),

The Recv task,

Receives signal plan information, signal control variables, and other operator command information from the signal control server and delivers it to the shared memory in a demand queue method.

The Siot task,

Receives detector data, traffic signal controller operation data by second, operation signal controller operation data by period, and operator's request data from the traffic signal controller, and delivers them to the Send task by a message queue method.

The Send task,

It is designed to receive detector data, traffic signal controller operation data, second traffic signal controller operation data, operator request data, communication control device signal planning data, intersection control information from the Siot task and transmit them to the signal control server. It features.

Here, the Send task, Recv task, Siot task, and shared memory,

Send and receive data through IPC (Inter Process Communication),

The Send and Recv tasks are

Exchanging data with the signal control server using a UDP / IP protocol,

The Siot task,

Data is exchanged with the traffic signal controller through serial communication.

Here also the Siot task,

Tasks corresponding to the number of traffic signal controllers are formed.

Another feature of the invention,

In the control method of a traffic signal control system using a communication control device,

A first step in which a Send task, a Recv task, a Siot task, and a shared memory of the communication control device are driven to initialize data and activate a communication port to connect a signal control server, a signal management server, and a traffic signal controller;

In the Siot task, select an intersection number to control through the database of the signal management server, and receive the first signal control server signal plan and signal control variables (period, manifest, offset) of the corresponding intersection from the signal control server. Step 2 of establishing an initial release point signal control plan,

When the planning is completed, a signal map table, which is a time operation table for each traffic light unit, is used to update clock information and a database of the traffic signal controller for time synchronization between the signal control server and the traffic signal controller in the Siot task. Transmitting to the traffic signal controller to be updated by the traffic signal controller;

When the transmission is complete, the Siot task initializes the task driving start time to "0", initializes the cycle counter necessary for cross-linking to "0", and checks whether there is an operator command. Requesting second traffic signal controller operation data and transmitting the same to the signal control server;

When the transmission is completed, the Siot task checks whether the current system time is a release point, and if it is a release point, transmits intersection control information (Force-Off) including an operation mode to the traffic signal controller, receives a response, and receives the signal. A fifth step of transmitting to the control server,

Check whether the first one cycle of the traffic signal controller is finished. If a detector is present in the traffic signal controller in the terminated state, request and receive a detector data and transmit the data to the signal control server. Requesting signal controller operation data and transmitting the same to the signal control server;

The Siot task requests and receives the signal control server signal plan information and the signal control variable information (period, manifest, offset) established by the signal control server, and calculates a release point for each manifest by using the signal control server. A seventh step of transmitting the communication control device signal planning information;

An eighth step of controlling the traffic signal controller in real time according to the calculated release point value, receiving the response of the traffic signal controller and transmitting the response to the signal control server;

And a ninth step of initializing the process in units of seconds by setting the time for starting the cycle to "0" when one cycle of the real-time control ends.

Herein, if it is not the release point time in the fifth step, check whether the current time is the end time,

If it is not the end of time, the timer is operated so that the driving time of the Siot task is added to 1 second, and the cycle counter is increased to "1", and if there is an operator command again, if there is no operator command, the traffic signal controller has a second traffic signal. Request controller operation data and transmit it to the signal control server,

If the current signal is terminated, check whether the first one cycle of the traffic signal controller has ended. If a detector exists in the traffic signal controller in the terminated state, request and receive a detector data and transmit the data to the signal control server. Requests a traffic signal controller operation unit on a periodic basis and transmits it to the signal control server.

Hereinafter, the configuration of a communication control apparatus of a traffic signal control system according to the present invention will be described in detail with reference to FIGS. 1 and 2.

1 is a configuration diagram schematically showing a configuration of a traffic signal control system to which a communication control device according to the present invention is applied, and FIG. 2 is an explanatory view showing a task configuration of the communication control device according to the present invention.

First, a task is a path of execution through the representation of a program, dynamic model, or other control flow. A unit of work for doing one thing with a computer. This can be said from the computer's point of view. It is usually used synonymously with process, but is slightly different. A task is one in which at least one executable program is associated.

1 and 2, the communication control device 100 according to the present invention includes a Recv task 101, a Siot task 102, a Send task 103, and a shared memory 104.

The Recv task 101 receives signal plan information, signal control variables, and other operator command information from the signal control server 110 and delivers them to the shared memory 104 in a demand queue manner. In this case, the demand queue is an IPC (Inter Process Communication) method, and when data is stored in a demand buffer of a memory, the next task processes a command in the order stored in the buffer.

The Siot (real time control: Serial Input Ouput) task 102 receives the detector data, the traffic signal controller operation data for each second, the traffic signal controller operation data for each cycle, and the operator's request data from the traffic signal controller 130 to share a memory ( Through the 104, it transmits to the Send task 103 by the message queue method. In addition, the Siot task 102 controls a plurality of intersection traffic signal controllers in real time through the intersection control information (Force-Off) of the communication control device 100 established according to the updated signal plan data value of the shared memory 104. do. Here, the intersection control information is the green time end command information of each time in real time control.

The Send task 103 sends the detector data, the traffic signal controller operation data, the traffic signal controller operation data, the operator request data, the communication control device signal planning data, the intersection control information from the Siot task 102, and the like. Transfer to the signal control server 110. Here, the Siot task 102 exchanges data with the traffic signal controller 130 through serial communication. Here, the Siot task 102 is formed with tasks corresponding to the number of traffic signal controllers 130. Here, Message Queuing is an IPC method where data is stored in a message buffer in memory, and the next task processes commands in the order stored in the buffer.

The shared memory 104 transfers various data transmitted from the Recv task 101 to the Siot task 102 by the dimension queue method. Here, the Recv task 101, the Siot task 102, the Send task 103, and the shared memory 104 exchange data via IPC (Inter Process Communication), and the Send task 103 and the Recv task 101 exchanges data with the signal control server 110 using the UDP / IP protocol. Here, UDP / IP refers to a protocol that can transmit and receive information to and from the client with the port always active without preparing for server reception during Lan communication between the server and the client.

Hereinafter, a control method of a traffic signal control system using a communication control device according to the present invention will be described in detail with reference to FIG. 3.

3 is a flowchart illustrating an operation of a control method of a traffic signal control system using a communication control device according to the present invention.

First, when the operator wants to perform real time control of the traffic signal controller 130, the Send task 103, the Recv task 101, the Siot task 102, and the shared memory 104 of the communication control apparatus 100 are driven. The data is initialized (S1), the communication port is activated (S2), the signal control server 110, the signal management server 120 and the traffic signal controller 130 is connected (S3).

In this state, the Siot task 102 selects the intersection number to perform control through the database of the signal management server 120, and from the signal control server 110, the initial signal control server signal plan and signal control variable of the intersection. (Period, manifestation, offset) is received through the Recv task 101 and the shared memory 104 (S4), and an initial release point (Release Point) signal control plan is established (S5). Here, the release point refers to the time of the intersection control information command that causes the yellow time to enter the progression, and the cycle refers to the time from the main manifestation to the first appearance actuation when the signal is operated. Split refers to the sum of green signal time and yellow time for each mobile flow (left turn or straight), and offset refers to the time taken from the currently passing intersection to the next intersection.

When the planning is completed, the Siot task 102 receives clock information from the signal management server 120 for time synchronization between the signal control server 110 and the traffic signal controller 130 (S6), and the traffic signal controller ( 130, the traffic signal controller 130 is synchronized (S7).

Then, the Siot task 102 receives a signal map table, which is a time operation table for each traffic light, for updating the database of the traffic signal controller 130, from the database of the signal management server 120 and receives the traffic signal controller 130. Then, the signal map table is stored in the ROM of the traffic signal controller 130 (S8).

Then, the Siot task 102 initializes the task driving start time to "0", initializes the cycle counter necessary for cross-linking to "0" (S9), checks whether there is an operator command (S10), and the operator command is If present, the Siot task 102 transmits an operator command to the traffic signal controller 130 to process the operator command (S11), and then requests the traffic signal controller operation data in seconds from the traffic signal controller 130 and sends it to the Send task ( The transmission is transmitted to the signal control server 110 by the message queue method through 103 (S12).

In addition, the Siot task 102 checks whether the current system time is a release point (S13), and at the release point, the intersection control information (Force-Off) including an operation mode (online, offline, etc.) in the traffic signal controller 130. ), And after receiving the response and transmitting the response to the signal control server 110 (S14), it is determined whether one cycle has ended (S15). Here, if the current system time is not the release point, the Siot task 102 checks whether the current time is the end of time (S13-1), waits 1 second if not the end of time (S13-2), and then cycles the counter. Is increased to " 1 " (S13-3), the process returns to step 10 (S10) to proceed to the subsequent process, and if the current time is over, the process passes to step 15 (S15).

Thus, when the cycle ends, the Siot task 102 checks whether a detector exists in the traffic signal controller 130 (S16), and if so, requests the detector data from the traffic signal controller 130, and controls the received data. The server 110 transmits the data to the server 110 (S17). Here, the Siot task 102 returns to step 13-2 (S13-2) if the cycle is not finished, and performs the subsequent process. If the detector does not exist in the traffic signal controller 130, step 18 (S18). Is passed).

In addition, the Siot task 102 requests the traffic signal controller operation data on a periodic basis to the traffic signal controller 130 and transmits the received data to the signal control server 110 (S18).

The signal control server 110 then plans the signal control server signal plan information and signal control variable information (period, manifest, offset) using the received data.

Meanwhile, the Siot task 102 requests the signal control server signal plan information and the signal control variable information (period, manifestation, offset) from the signal control server 110 based on the received data and release points based on the received data. After calculating the, and transmits the communication control device signal plan information to the signal control server 110 (S20).

Then, the Siot task 102 controls the traffic signal controller 130 in real time according to the calculated release point value, receives the response of the traffic signal controller 130 and monitors it in the signal control server 110. The signal control server 110 transmits (S21).

Finally, when one cycle of real time control is finished, the Siot task 102 returns to step 9 (S9) to set the time for starting the cycle to " 0 "

As described above, according to the task design method of the communication control apparatus of the traffic signal control system according to the present invention and the control method of the traffic signal control system using the same, task management to ensure the calculation allowable time when requesting calculation at several intersections at the same time By providing a high-frequency task design technique for performing technology and second-second communication with hundreds of intersections, it is possible to more reliably remotely manage traffic signal controller management in the center of the signaling system. In addition, it is possible to optimize the group control and supersaturation control of the city intersection by providing a method of controlling transmission and reception data for optimizing the signal planning information received through the traffic engineering algorithm performed at the signal control server of the signal system.

Claims (5)

In the design method of the communication control device of the traffic signal control system consisting of a signal control server, a communication control device and a traffic signal controller, Design the communication control device as a Recv task, Send task, Siot task, shared memory (Common Memory), The Recv task, Receives signal plan information, signal control variables, and other operator command information from the signal control server and delivers it to the shared memory in a demand queue method. The Siot task, Receives detector data, traffic signal controller operation data by second, operation signal controller operation data by period, and operator's request data from the traffic signal controller, and delivers them to the Send task by a message queue method. The Send task, It is designed to receive detector data, traffic signal controller operation data, second traffic signal controller operation data, operator request data, communication control device signal planning data, intersection control information from the Siot task and transmit them to the signal control server. A task design method for a communication control device of a traffic signal control system, characterized by the above-mentioned. The method of claim 1, The Send task, Recv task, Siot task, and shared memory, Send and receive data through IPC (Inter Process Communication), The Send and Recv tasks are Exchanging data with the signal control server using a UDP / IP protocol, The Siot task, Task design method of the communication control device of the traffic signal control system, characterized in that for transmitting and receiving data with the traffic signal controller through serial communication. The method of claim 1, The Siot task, The task design method of the communication control device of the traffic signal control system, characterized in that the task corresponding to the number of the traffic signal controller is formed. In the control method of a traffic signal control system using a communication control device, A first step in which a Send task, a Recv task, a Siot task, and a shared memory of the communication control device are driven to initialize data and activate a communication port to connect a signal control server, a signal management server, and a traffic signal controller; In the Siot task, select an intersection number to control through the database of the signal management server, and receive the first signal control server signal plan and signal control variables (period, manifest, offset) of the corresponding intersection from the signal control server. Step 2 of establishing an initial release point signal control plan, When the planning is completed, a signal map table, which is a time operation table for each traffic light unit, is used to update clock information and a database of the traffic signal controller for time synchronization between the signal control server and the traffic signal controller in the Siot task. Transmitting to the traffic signal controller to be updated by the traffic signal controller; When the transmission is complete, the Siot task initializes the task driving start time to "0", initializes the cycle counter necessary for cross-linking to "0", and checks whether there is an operator command. Requesting second traffic signal controller operation data and transmitting the same to the signal control server; When the transmission is completed, the Siot task checks whether the current system time is a release point, and if it is a release point, transmits intersection control information (Force-Off) including an operation mode to the traffic signal controller, receives a response, and receives the signal. A fifth step of transmitting to the control server, Check whether the first one cycle of the traffic signal controller is finished. If a detector is present in the traffic signal controller in the terminated state, request and receive a detector data and transmit the data to the signal control server. Requesting signal controller operation data and transmitting the same to the signal control server; The Siot task requests and receives the signal control server signal plan information and the signal control variable information (period, manifest, offset) established by the signal control server, and calculates a release point for each manifest by using the signal control server. A seventh step of transmitting the communication control device signal planning information; An eighth step of controlling the traffic signal controller in real time according to the calculated release point value, receiving the response of the traffic signal controller and transmitting the response to the signal control server; And a ninth step of initializing the process in units of seconds, by setting the time for starting the cycle to "0" when one cycle of the real-time control is finished. The method of claim 4, wherein In step 5, if it is not the release point time, check whether the current time is the end time. If it is not the end of time, the timer is operated so that the driving time of the Siot task is added to 1 second, and the cycle counter is increased to "1", and if there is an operator command again, if there is no operator command, the traffic signal controller has a second traffic signal. Request controller operation data and transmit it to the signal control server, If the current signal is terminated, check whether the first one cycle of the traffic signal controller has ended. If a detector exists in the traffic signal controller in the terminated state, request and receive a detector data and transmit the data to the signal control server. Requesting the operation data of the traffic signal controller on a periodic basis and transmitting it to the signal control server.