KR20050051956A - Control system and methdod for local divisional traffic signal - Google Patents

Abstract

The present invention relates to a regional segmented traffic signal control system and a control method for controlling a section independently by setting a plurality of intersections as one section.

Local divided traffic signal control system of the present invention is controlled by the central control center, the master control device for controlling the signal of the intersection; It is controlled by the master control device, consisting of a plurality of slave control devices for controlling the signals of a plurality of intersections, respectively, the master control device and a plurality of slave control devices consisting of one section, Intersections can be controlled simultaneously. According to the present invention, since a plurality of intersections can be set at one section and controlled at the same time, there is an effect of smoothly communicating the flow of traffic.

Description

Local Controlled Traffic Signal Control System and Control Method {Control System and Methdod for Local Divisional Traffic Signal}

The present invention relates to a regional segmented traffic signal control system capable of smoothly communicating vehicles by controlling a plurality of intersections simultaneously by setting a plurality of intersections as one section.

Currently, vehicles are increasing exponentially. As a result, the traffic volume in the city center and the area around the city are saturated, resulting in traffic jams in various parts of the road.

1 is a block diagram of a conventional traffic signal control apparatus.

As shown in FIG. 1, a conventional traffic signal control apparatus includes a lighting time input unit 1 for inputting data for determining a lighting time of a traffic light A including red, green, yellow, and arrow lights. On and off of each of the traffic lights sequentially and automatically according to the lighting time input to the display part 3 and the lighting time input part 1 for displaying the time and the operation state of the traffic signal control device. Outputting a signal, and controlling the display output of the display section 3, the signal lamp driver 7 for driving the traffic lights by converting the light control signal, which is the output of the calculation section 5, into an analog signal and for manual operation. It consists of a manual operation part 9 which controls the light control signal which is the output of the calculation part 5 by this.

The conventional traffic signal control device is turned on or off by circulating the traffic light A by the lighting time determined by the lighting time input unit 1, or by forcibly turning on the traffic light A manually by the manual control unit 9. Or can only be turned off.

Therefore, since the traffic lights are not automatically controlled in real time according to the traffic volume on the road, it is not possible to smoothly flow the traffic of the car in the intersection, thereby causing a traffic jam.

The present invention has been invented to solve the above problems, the object of the present invention is to set up a plurality of intersections in one section to control a plurality of intersections at the same time, smoothly divided traffic that can communicate vehicles The present invention provides a signal control system.

Area segmented traffic signal control system of the present invention for achieving the above object, is provided with the traffic situation transmitted from the control device for controlling the intersection to manage the overall traffic signal using the signal management server and the signal control center And a master control device controlled by a central control system having a modem of the communication control device and a plurality of slave control devices controlled by the master control device.

The master control device includes a sub-area server including an RF wireless module for controlling a plurality of slave control devices for controlling traffic signals at an intersection and having a modem to be connected to a central control center; A main controller connected to the sub area server; A signal driver controlled by the main controller to drive a signal; An operator connection device capable of manually controlling the main controller; It is composed of a loop detection unit for providing vehicle information to the main control unit.

The slave controller includes an RF wireless module that can communicate wirelessly with a master controller; A control unit connected to the RF wireless module; A signal driver controlled by the controller to drive a signal; It is composed of a loop detector for providing vehicle information to the controller.

The sub area server may control a plurality of slave control devices so that a plurality of intersections are set in one section, and simultaneously control traffic signals in the section.

The loop detection unit detects a state of a vehicle in a left turn lane and provides a state information of a vehicle in a left turn lane to the main controller, and detects a state of a vehicle in a straight lane to detect a state of a vehicle in a straight lane. It consists of a straight line detector that can provide the state information of, a clogging detector for detecting the state of the vehicle flowing from the adjacent intersection, and a queue detector for detecting the trapped state of the vehicle waiting on the stop line.

The left turn detector may detect a state of the vehicle within 20m backward from the stop line.

The straight detector may detect a state of the vehicle within 30m rearward from the stop line.

The front clogging detector may detect a state of an inflow vehicle 60 m after the stop line in order to detect a state of a vehicle flowing in an adjacent intersection.

The queue detector may detect a state of the red vehicle by selecting one of 100m, 200m, and 400m rearward from the stop line to detect the state of the standby vehicle.

The sub area server may simultaneously control the two sections in a state in which two sections are combined as the vehicle increases.

In the combined section, one of the two sub area servers may control a section in which the sub area server is combined.

In addition, the regional segmented traffic signal control method of the present invention comprises the steps of: a sub-area server, a plurality of slave control devices are connected to each other to form a section, and the sub-area server is connected to the central control center; Sensing information of the vehicle by a loop detector of the sub area server and a loop detector of each of the plurality of slave controllers; Controlling a traffic signal for one section by using information of the vehicle detected by the loop detector; The one section and the adjacent section are connected to each other according to the traffic situation to control the traffic signal.

The detecting of the vehicle information by the loop detection unit of the sub area server and the loop detection unit of each of the plurality of slave controllers may include detecting a state of a standby vehicle in a left turning lane by a left turn detector of the loop detector. And detecting a state of a standby vehicle in a straight lane by a straight detector of the loop detector, and detecting a state of a vehicle flowing in an adjacent intersection by a front clogging detector of the loop detector; Detecting a state of a vehicle waiting behind the stop line by a queue detector, and the sub-area server first gives a traffic signal to a place where the saturation of the vehicle is high by using the vehicle information detected by each loop detector; It consists of steps.

The controlling of the traffic signal for one section by using the information of the vehicle detected by the loop detector may include providing information of the vehicle detected by each loop detector to a sub area server, and the sub area. The server calculates a period and an offset value for the traffic signal using the provided vehicle information, and the values calculated by the sub area server are provided to the respective main controller and the controller, and the main controller and the controller are respectively Characterized in that the step consisting of driving the signal driver.

The controlling of the traffic signal by connecting the one section and the adjacent section with each other according to the traffic situation may include comparing the sub-area servers of the one section and the adjacent section with the increase of the vehicle, respectively. Controlling a section in which a sub area server of a section in which a vehicle is increased among the sub area servers of the combined section is separated, the combined section is separated by a decrease in a vehicle, and each section is separated in a respective sub area The steps are controlled by the server.

Hereinafter, the regional segmented traffic signal control system of the present invention will be described with reference to the accompanying drawings.

Figure 2 is a block diagram of a regional segmented traffic signal control system of the present invention, Figure 3 is a block diagram of a master control device and a slave control device, Figures 4a and 4b is a state diagram and the section is separated and combined, 5 to 8 is a flow chart according to the control method of the present invention, Figure 9 is a state diagram of the use of the regional segmented traffic signal control system is installed.

First, as shown in Figures 2 and 3, the regional segmented traffic signal control system of the present invention is composed of one section (A), the one section (A) is largely in the central control center (10) The master control device 100 and the slave control device 200 is controlled by.

The master control device 100 includes a sub area server 110; A main control unit 120 connected to the sub area server 110; A signal driver 130 controlled by the main controller 120 to drive a signal; An operator connection device 140 capable of manually controlling the main controller 120; The loop controller 150 may provide vehicle information to the main controller 120.

The sub area server 110 is provided with an RF wireless module 111 for controlling a plurality of slave control devices 120 for controlling traffic signals of intersections on one side thereof, and for being connected to the central control center 10. The modem 112 is provided.

The central control center 10 is largely comprised of a signal management server 11, a signal control center 12, an operator terminal 13, a communication control device 14, and a modem 15.

The central control center 10 receives a traffic situation transmitted from each control device 100 and 200 to manage and control the overall traffic signal using the signal management server 11 and the signal control center 12, and control the communication. The modem 15 of the controller 14 may be transferred to the respective controllers 100 and 200.

The regional segmented traffic signal control system controls the master control device 100 to control traffic signals for a corresponding intersection, and at the same time, a slave controller 200 of an adjacent intersection using the sub area server 110. ) Can be controlled, and the traffic situation and traffic history that are changed in real time can be reported to the central control center 10.

The slave control apparatus 200 is connected to the RF wireless module 210 and the RF wireless module 210 provided to be wirelessly connected to the sub area server 110 of the sub area server 110. The controller 220 driven by the control, the signal driver 230 for executing a traffic signal by the control unit 220, and the loop detection unit 240 that can provide vehicle information to the control unit 220 Consists of.

The main control unit 120 of the master control device 100 and the control unit 220 of the slave control device 200 are used to calculate signal manifestations, signal periods, and offset values based on information provided and detected in real time. By implementing the TRC (Traffic Response Control) control mode that can respond to the traffic volume, and the TOD (Time Of Day) control mode that is executed by the input signal time data.

In addition, the sub area server 110 of the master control device 100 controls the main control unit 120 and the control unit 220 by increasing / decreasing the vehicle to set the length of the signal cycle in real time.

The sub area server 110 sets an offset value of the signal period by increasing / decreasing the vehicle.

The loop detectors 150 and 240 are left turn detectors 151 and 241, straight detectors 152 and 242, frontal block detectors 153 and 243, and queue detectors 154 and 244. Each structure is identical. Therefore, the loop detector 150 provided in the sub area server 110 is the same as the description, and thus the description of the loop detector 240 of the slave controller 200 will be omitted.

The loop detector 150 detects a state of a vehicle in a left turn lane and provides a left turn detector 151 that can provide state information of a vehicle in a left turn lane to the main controller 120 and a state of a vehicle in a straight lane. A straight line detector 152 capable of detecting and providing state information of a vehicle in a straight lane to the main controller, a front clogging detector 153 for detecting a state of a vehicle flowing in an adjacent intersection, and a vehicle waiting at a stop line It is composed of a queue detector 154 for detecting the trapping state of the.

The left turn sensor 151 may detect a state of the vehicle within 20m backward from the stop line of the intersection.

The straight sensor 152 may detect the state of the vehicle within 30m to the rear from the stop line.

The front clogging detector 153 may detect a state of the inflow vehicle 60m after the stop line in order to detect the state of the vehicle flowing in the adjacent intersection.

The queue detector 154 may detect a state of the red vehicle by selecting one of 100m, 200m, and 400m rearward from the stop line to detect the state of the standby vehicle.

When the loop detector 150 detects information of the vehicle and provides the information to the main controller 120, the main controller 120 may determine a cycle time of the traffic signal by obtaining a state of the provided vehicle, that is, saturation degree.

The saturation is divided into the maximum saturation degree and the average saturation degree, the formula for obtaining the maximum / average saturation is as follows.

Maximum Saturation

C = 0.6 * MDS + current cycle-f (current cycle)

if (current cycle) = 30, if (current cycle) ≤60 seconds

if (current cycle) = 54, if (current cycle) ≥100 seconds

(0.6 * current cycle-6), otherwise

Where MDS = highest average saturation among the straight moving streams in each inlet.

Average Saturation

RL = a * ADS + CCL-f (CCL)

Where a is the application rate for the average degree of intersection

(Default: 0.6 for maximum saturation, 0.75 for straight average saturation, operator-specified value)

Where ADS = average saturation of the straight moving streams in each inlet.

<Compensation process for cycle change>

if │C-current week │≤ΔC, next cycle = C,

if C-Current week ≥ΔC, Next cycle = Current cycle + ΔC

if C-Current week ≤- ΔC, Next cycle = Current cycle-ΔC

Where ΔC: increment of period (set value)

The saturation is determined in real time, and the offset value according to supersaturation is calculated as follows.

First, the traffic volume converted into the vehicle in the inflow / outflow direction is calculated, the inflow / outflow ratio (IOR) is calculated, the offset pattern is selected, and the change condition according to the selection of the offset pattern is satisfied. If the condition is satisfied for more than 3 consecutive cycles, a new offset pattern is selected.

The formula of the traffic ratio (IOR) is as follows.

IOR = V _in (t + 1) / V _out (t + 1)

Herein, V _in (t + 1) = inbound traffic in t + 1 time, and V _out (t + 1) = outbound traffic in t + 1 time.

And, the method of calculating the offset when oversaturated is as follows.

First, a time calculation (time1) for a vehicle passing through an upstream stop line to pass a downstream intersection is performed.

time1 (sec) = Link_Length (m)-Queue_Length (m) / (Progression_Speed (Km / hr) /3.6)

After the green time starts, calculate the time (time2) until the vehicle in the waiting vehicle detector starts to move,

time2 (sec) = Queue_Length (m) / Shock_Wave_Speed

Perform a new offset calculation.

New Offset = time1-time2

On the other hand, the sub area server 110 of the master controller 100 can terminate the unnecessary traffic signal time early and allocate the traffic signal time to the adjacent intersection where the demand is high, thereby maximizing the traffic signal.

Therefore, the saturation calculation formula according to the detection of the loop detectors 150 and 250 is as follows.

DS = [g-(∑space-V * sp (sf))] / g, Wt = ∑space-V * sp (sf)

Where Wt is the loss time, V is the number of vehicles detected during the green time, sp (sf) is the saturation non-occupancy time, and Space is the non-occupancy time during the green time.

In addition, as shown in Figures 4a and 4b, the regional segmented traffic signal control system configured as described above has a vehicle in each section (A, B) of one section (A) and the other section (B) adjacent to each other. By controlling the traffic using one sub-area server 110 by combining into one section (A, B) according to the increase of, the section (A) combined according to the reduction of the vehicle in the combined section (A, B) Can be separated again.

Meanwhile, the intersection in one section A may be divided into a critical intersection (CI), a semi critical intersection (SCI), and a minor intersection (MI).

The method of applying the offset value according to the combined sections A and B is as follows.

<Variable definition>

OffsetOld (i) = Offset value before join

SAJoinOffset (i) = correction offset value after joining

SAmainOffset = end intersection offset of Main SA

SAsubOffset = end intersection offset of Sub SA

Here, SA is a sub-area, SAmain is one section A, and SAsub is an adjacent section B.

First, the combined offset is found in the combined offset table according to the main SA offset direction (inflow priority, average outflow priority).

Coupling Offset = Relative offset between the termination intersection of SAmain and the termination intersection of SAsub, each termination intersection being adjacent.

Then, the offset correction value of each intersection in the SA is obtained. We obtain a value that changes the termination intersection of SAsub to maintain the combined offset (relative offset) obtained with the termination intersection of SAmain.

Compensation offset = SAsubOffset + combined offset-SubSA offset

Then, the offset of each intersection in the SA is corrected.

SAsubOffset (i) = (OffsetOld (i) + compensation offset)% period length

Meanwhile, the method of applying the offset value in the super saturation state is as follows.

If the tail of the standby vehicle is about LQ (m) away from the queue detectors 154 and 244 of the loop detectors 150 and 250, the offset adjustment amount is determined as follows.

QA = LQ / SWS

Where QA is the offset adjustment amount, LQ is the distance (m) between the queue detector and the queue, and SWS is the shock wave velocity.

Hereinafter, a regional segmentation type traffic signal control method according to the present invention will be described with reference to the accompanying drawings.

5 to 8, the sub area server 110 and the plurality of slave control apparatuses 200 are connected to each other to form one section A, and the sub area server in the central control center 10. Initialize so that the 110 is connected (S100).

The sub area server 110 of the master control device 100 is controlled by the central control center 10, but is driven independently in accordance with the increase of the vehicle to control traffic signals.

The vehicle information is sensed by the loop detector 150 of the sub area server 110 and the loop detector 250 of each of the plurality of slave controllers 200 (S200).

The left turn detectors 151 and 241 of the loop detectors 150 and 250 sense the state of the standby vehicle in the left turn lane (S210).

The state of the waiting vehicle in the straight lane is detected by the straight detectors 152 and 242 of the loop detectors 150 and 250 (S220).

The front blocking detectors 153 and 243 of the loop detectors 150 and 250 detect a state of the vehicle flowing in the adjacent intersection (S230).

By the queue detectors 154 and 244 of the loop detectors 150 and 250, a state of the vehicle waiting behind the stop line is sensed (S240).

When the loop detectors 150 and 250 transmit the detected vehicle information to the sub area server 110, the sub area server 110 uses the detected vehicle information at an intersection where the saturation of the vehicle is high. First, give a traffic signal (S250)

The loop detectors 150 and 250 control the traffic signal for one section A using the detected information of the vehicle (S300).

Information of the vehicle detected by each of the loop detectors 150 and 250 is provided to the sub area server 110 (S310), and the sub area server 110 uses the provided vehicle information for the traffic signal. When the period and the offset value are calculated (S320), the values calculated by the sub area server 110 are provided to the respective main control unit 120 and the control unit 220 (S330), and the main control unit 120 and the control unit. 220 is to drive each of the signal driver (130, 230) (S340).

The one section (A) and the adjacent section (B) are connected to each other according to the traffic situation to control the traffic signal (S400).

By the increase of the vehicle, the one section A and the adjacent section B are combined (S410), and the combined sections A and B are controlled by one sub area server 110 ( In operation S420, the combined sections A and B are separated by the reduction of the vehicle S430, and the separated section A and the adjacent section B are connected to each sub area server 110. It is controlled by (S440).

The combined sections A and B are separated by the reduction of the vehicle in the combined sections A and B and are controlled by the respective sub area servers 110 (S420).

As described above, the regional divided traffic signal control system of the present invention may control the plurality of slave controllers 200 controlling the plurality of adjacent intersections using the master controller 100.

As described above, the regional segmented traffic signal control system according to the present invention forms a plurality of intersections as sections by sub-area servers of the regional segmented traffic signal control system, and then controls traffic congestion due to the increase of vehicles. There is an effect that can be minimized.

In addition, since it can be operated independently from the central control center, there is an advantage that can be optimized to secure the interlocking between the intersection located on the outskirts of the city, national road or local road.

1 is a block diagram of a conventional traffic signal control apparatus,

2 is a block diagram of a regional segmented traffic signal control system of the present invention;

3 is a configuration diagram of a master controller and a slave controller;

4A and 4B are diagrams in which sections and sections are separated and combined;

5 to 8 is a flow chart according to the control method of the present invention,

9 is a state diagram in which the regional segmented traffic signal control system is installed.

<Description of the symbols for the main parts of the drawings>

100: master controller 110: sub area server

120: main controller 130: signal driver

140: operator connection device 150: loop detection unit

200: slave controller

Claims (15)

In the kytok signal control system, Receives the traffic situation transmitted from the control device controlling the intersection, manages and controls the entire traffic signal using the signal management server and the signal control center, and is controlled by the central control system equipped with the modem of the communication control device. And a master control device for controlling traffic signals of a plurality of slave control devices controlled by the master control device and controlling traffic signals of a plurality of intersections. 2. The apparatus of claim 1, wherein the master controller comprises: a sub area server having an RF wireless module for controlling a plurality of slave controllers for controlling traffic signals at intersections and having a modem for connection to a central control center; A main controller connected to the sub area server; A signal driver controlled by the main controller to drive a signal; An operator connection device capable of manually controlling the main controller; And a loop detection unit configured to provide vehicle information to the main control unit. 2. The apparatus of claim 1, wherein the slave controller comprises: an RF wireless module capable of wirelessly communicating with a master controller; A control unit connected to the RF wireless module; A signal driver controlled by the controller to drive a signal; And a loop detection unit configured to provide vehicle information to the control unit. 4. The apparatus of claim 3, wherein the loop detector detects a state of a vehicle in a left turn lane and provides state information of a vehicle in a left turn lane to the main controller, and detects a state of a vehicle in a straight lane. It is a straight line detector that can provide the state information of the vehicle in the straight lane to the control unit, a front clogging detector that detects the state of the vehicle flowing from the adjacent intersection, and a queue detector that detects the trapping of the vehicle waiting on the stop line. Local segmented traffic signal control system, characterized in that the configuration. [5] The system of claim 4, wherein the left turn detector can detect a state of a vehicle within 20m from the stop line. 5. The system of claim 4, wherein the straight line detector is capable of detecting a state of a vehicle within 30m behind the stop line. The system of claim 4, wherein the front clogging detector detects a state of an inflow vehicle 60 m after a stop line to detect a state of a vehicle flowing in an adjacent intersection. 5. The area segmentation method of claim 4, wherein the queue detector detects a state of the red vehicle by selecting one of 100m, 200m, and 400m rearward from the stop line to detect a state of the standby vehicle. Type traffic signal control system. The regional divided traffic signal of claim 1, wherein the sub area server controls a plurality of slave control devices so that a plurality of intersections are set as one section, and simultaneously controls traffic signals within the section. Control system. The system of claim 1, wherein the sub area server is capable of controlling two sections at the same time as the number of vehicles increases. 11. The system of claim 10, wherein the subdivision of one subarea server of the two subarea servers is controlled in the combined subdivision. A sub area server and a plurality of slave control devices connected to each other to form a section, and the sub area server is initialized to be connected to a central control center; Sensing information of the vehicle by a loop detector of the sub area server and a loop detector of each of the plurality of slave controllers; Controlling a traffic signal for one section by using information of the vehicle detected by the loop detector; And the one section and the adjacent section are connected to each other according to traffic conditions to control traffic signals. The method of claim 12, wherein the detecting of the vehicle information by the loop detection unit of the sub area server and the loop detection unit of each of the plurality of slave controllers is performed by a left turn detector of the loop detection unit. Sensing a state of the vehicle; detecting a state of a standby vehicle in a straight lane by a straight detector of the loop detector; and detecting a state of a vehicle flowing in an adjacent intersection by a clogging detector of the loop detector; And detecting a state of the vehicle waiting behind the stop line by the queue detector of the loop detector, and using the vehicle information detected by each loop detector by the sub area server, the intersection of high saturation of the vehicle. Local division type, characterized in that consisting of the steps of giving a traffic signal first How to control the communication call. The method of claim 12, wherein the controlling of the traffic signal for one section by using the information of the vehicle detected by the loop detection unit comprises: information of the vehicle detected by each loop detection unit is provided to the sub area server. And calculating, by the sub area server, a period and an offset value for the traffic signal using the provided vehicle information, and providing a value calculated by the sub area server to each main controller and the control unit. The main control unit and the control unit are divided region type traffic signal control method comprising the steps of driving each signal driver. The method of claim 12, wherein the controlling of the traffic signal by connecting the one section and the adjacent section to each other according to a traffic situation includes comparing the sub-area servers of the one section and the adjacent section with the increase of the vehicle. And controlling a section in which the sub area server of a section in which the vehicle is increased among the sub area servers is combined, and separating the combined section by the reduction of the vehicle. And the section is controlled by each sub area server.