WO2013022188A2 - 계층적 구조의 식별정보를 이용한 교통 신호 제어 장치 및 방법 - Google Patents
계층적 구조의 식별정보를 이용한 교통 신호 제어 장치 및 방법 Download PDFInfo
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- WO2013022188A2 WO2013022188A2 PCT/KR2012/005237 KR2012005237W WO2013022188A2 WO 2013022188 A2 WO2013022188 A2 WO 2013022188A2 KR 2012005237 W KR2012005237 W KR 2012005237W WO 2013022188 A2 WO2013022188 A2 WO 2013022188A2
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/091—Traffic information broadcasting
- G08G1/092—Coding or decoding of the information
Definitions
- the present invention relates to an apparatus and method for controlling traffic signals, and more particularly, to an apparatus and method for efficiently controlling a traffic signal using hierarchical structure identification information.
- Traffic lights are devices installed at intersections or pedestrian crossings on the roads to instruct traffic vehicles or people to stop, bypass, or proceed by flashing red, green, yellow and green arrow signs.
- the traffic signal controller is networked to the traffic control center to perform signal conversion according to the control signal output from the traffic control center to adjust the flow of the vehicle.
- the traffic signal controller and the traffic control center are connected by wire through a dedicated line. Since the traffic control center and the traffic signal controller perform one-to-one communication, the traffic control center transmits different control commands to all the traffic signal controllers. Complex system was required, and due to the limitation of communication to all traffic signal controllers within a certain time, wired network through system or leased line should be maintained at high speed, so huge cost in facility cost, communication cost, facility maintenance cost, network maintenance cost, etc. There was a problem.
- a traffic signal controller for controlling a traffic light installed in a main road area such as an intersection is connected to a traffic control center.
- the traffic signal controller installed outside the main road area such as an intersection may set a period of performing a signal conversion operation constantly, and perform signal conversion according to a preset period to adjust the flow of the vehicle. That is, the traffic signal controllers other than the traffic signal controller connected to the traffic control center operate in a state unrelated to the control of the traffic control center.
- a traffic signal controller connected to a traffic control center via a dedicated line performs a signal conversion operation of a traffic light according to traffic information according to traffic conditions, and controls the flow of the vehicle, and other traffic signal controllers are configured in advance. Since the signal conversion operation is performed by the signal conversion period, there is a problem in that the signal control of the overall signal lamp cannot be performed and thus the vehicle flow cannot be controlled smoothly.
- Korean Patent Laid-Open Publication No. 10-2001-0100275 which has been invented and filed by the present applicant, discloses that a traffic control center selectively outputs a control signal for wirelessly controlling a traffic signal controller to control a signal conversion operation.
- An apparatus and a method for controlling a traffic signal are disclosed.
- the applicant has invented a number of patents, such as Korean Patent Publication No. 10-2006-0129993.
- Korean Patent Publication No. 10-2006-0129993 there was a limit that different control signals must be generated and output.
- Korean Patent Laid-Open Publication No. 10-2009-0008964 discloses that when the number of vehicles passing through is increased, the lighting time of the blue light is increased when the number of vehicles passing through is increased and blue when the number of vehicles passing through is decreased.
- a traffic signal control device according to the number of vehicles that can reduce the lighting time of the lamp and facilitate the traffic flow is disclosed. Even in this case, a sensor unit for detecting a driving vehicle and a counter unit for counting the number of vehicles are separately required for each traffic signal control device, and traffic light control is performed separately from the control at the traffic control center. There was a drawback that it could operate in a way that is contrary to the traffic flow.
- Korean Patent Laid-Open Publication No. 10-1999-0061409 discloses link data for a traffic system that enables link data to be constructed using such road names when a road having a plurality of nodes and links has a road name of a continuous link.
- a construction method is disclosed. Although one N-bit link data having an additional information link ID is to be constructed for a specific road, it is irrelevant to traffic light control and there is a limit that the link data has a certain size with N bits.
- the present invention is to provide a traffic signal control device and method that can easily and efficiently control the traffic lights installed on each road using the identification information having a hierarchical structure.
- the present invention enables simultaneous transmission of commands while significantly reducing the amount of data transmitted when selecting and controlling a plurality of traffic lights through the provision of hierarchical road link IDs and traffic light IDs and a single command (broadcasting) through a broadcasting network. It is to provide a traffic signal control device and a method in which the traffic signal controller of the need not be connected one-to-one with the traffic control center.
- a signal having the same conversion period is constant at a time when a reference signal is used for a plurality of traffic signal controllers grouped into the same group.
- the present invention provides a traffic signal control apparatus and method for allowing the traffic signal to be synchronized with the vehicle's driving speed by being advanced or delayed.
- a traffic signal control device for controlling signal conversion of a management signal lamp, the broadcast signal receiving unit receiving a broadcast signal transmitted from a traffic control center through a broadcast network, wherein the broadcast signal has a hierarchical structure Includes identification information and control instructions; And determining whether the management traffic light belongs to the object of the control command according to the identification information of the hierarchical structure, and performing signal conversion according to the control command only when the management traffic light is included in the control object.
- a traffic signal control device including a traffic light control unit for outputting a control signal is provided.
- the entire area under jurisdiction in the traffic control center may be subjected to collective signal conversion according to the control command. It may be information for identifying one or more subregions.
- the identification information of the hierarchical structure may have a structure in which the number of bits of data increases as the layer is lowered.
- Hierarchical information for dividing the hierarchical regions of the sub-region targeted for the control command can be extracted from the number of bits of the identification information of the hierarchical structure.
- the identification information of the hierarchical structure may include a hierarchical code indicating a hierarchy of a subregion as a target of the control command, and a detailed code for distinguishing the subregion from another subregion of the same hierarchy.
- the identification information of the hierarchical structure may include a road name code according to a road name address or a postal code according to an address number.
- the traffic light control unit may include a broadcast signal analysis unit analyzing the broadcast signal; A time synchronizer for synchronizing the system time of the management signal light with the system time with the reference signal light using the time synchronization time data extracted from the broadcast signal or the GPS time estimated by the GPS unit; An offset setting unit that sets the offset time using the offset parameter extracted from the broadcast signal; And a signal conversion controller configured to output a control signal for starting the signal manifestation of the management signal lamp at a time delayed by the offset time from the signal manifestation start time of the reference signal lamp.
- a traffic signal control method performed in a traffic signal control apparatus for controlling signal conversion of the management signal lamp and a recording medium on which a program for performing the same is recorded.
- a traffic signal control method includes receiving a broadcast signal transmitted from a traffic control center through a broadcast network, wherein the broadcast signal includes identification information and a control command of a hierarchical structure; Extracting hierarchical information of identification information of the hierarchical structure by analyzing the broadcast signal; Extracting segment data corresponding to the hierarchical information from identification information of the management signal lamp; Comparing the identification information of the broadcast signal with the discrimination data to determine whether the management signal lamp belongs to the object of the control command; And converting the signal according to the control command when the management signal is the control target as a result of the determination.
- the entire area under jurisdiction in the traffic control center may be subjected to collective signal conversion according to the control command. It may be information for identifying one or more subregions.
- the identification information of the hierarchical structure may have a structure in which the number of bits of data increases as the layer is lowered.
- Hierarchical information for dividing the hierarchical regions of the sub-region targeted for the control command can be extracted from the number of bits of the identification information of the hierarchical structure.
- Upper bit data corresponding to the number of bits corresponding to the hierarchical information among the identification information of the management signal lamp may be extracted as the division data.
- the identification information of the hierarchical structure may include a hierarchical code indicating a hierarchy of a subregion as a target of the control command, and a detailed code for distinguishing the subregion from another subregion of the same hierarchy.
- An identification code having the same hierarchical code as the hierarchical code among the identification information of the management signal may be extracted as the distinguishing data.
- the identification information of the hierarchical structure may include a road name code according to a road name address or a postal code according to an address number.
- the conversion of the signal according to the control command may include: determining an offset time with a reference signal lamp according to an analysis result of the broadcast signal; And outputting a control signal for controlling signal conversion of the management traffic light such that the time delayed by the offset time from the reference start time coincides with the signal presentation start time of the management traffic light.
- broadcasting a single command (broadcasting) through a broadcasting network in a traffic control center is related to a plurality of traffic signal controllers grouped in the same group. It is possible to interlock the traffic signal according to the speed of the vehicle by speeding up or delaying.
- FIG. 1 is a block diagram of a traffic signal control system according to an embodiment of the present invention.
- FIG. 2 is a diagram showing an embodiment of a data format of a broadcast signal according to the present invention.
- FIG. 3 is a diagram showing the configuration of hierarchical identification information of a broadcast signal according to the present invention.
- 4A to 4C illustrate embodiments of a data format of hierarchical identification information of a broadcast signal according to the present invention
- FIG. 5 is a block diagram of a traffic light control unit according to an embodiment of the present invention.
- FIG. 6 is a flowchart illustrating a traffic signal control method according to an embodiment of the present invention.
- FIG. 7 is a view illustrating examples for explaining a determination process according to the present invention.
- FIG. 8 is a view for explaining the concept of a traffic signal control method according to an embodiment of the present invention.
- FIG. 9A illustrates an embodiment of a manifest start control information format according to the present invention
- FIG. 10 is a block diagram of a traffic light control unit according to another embodiment of the present invention.
- FIG. 11 is a flowchart illustrating a traffic signal control method according to another embodiment of the present invention.
- first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
- FIG. 1 is a block diagram of a traffic signal control system according to an embodiment of the present invention
- FIG. 2 is a diagram showing an embodiment of a data format of a broadcast signal according to the present invention
- FIG. 3 is a broadcast according to the present invention.
- 4A to 4C are diagrams illustrating embodiments of a data format of hierarchical identification information of a broadcast signal according to the present invention
- FIG. 5 is a diagram illustrating one embodiment of the present invention. It is a block diagram of the structure of the traffic light control part.
- the traffic signal control system includes a traffic control center 100 and first to n-th traffic signal controllers 200-1 to 200-n (hereinafter collectively referred to as '200').
- One or more traffic lights 250-1, 250-2, ... are connected to the traffic signal controller, and each traffic light 250-1, 250-2, ... is subjected to signal conversion control by the traffic signal controller.
- each of the traffic lights 250-1, 250-2,... May be one of traffic lights or pedestrian traffic lights installed at an intersection or a crosswalk, and in the following, one or more traffic lights connected to one traffic signal controller ( 250-1, 250-2, ...) will be described assuming a single management traffic light 250.
- the traffic control center 100 selects a traffic light to control signal conversion and transmits a command to identify the hierarchical structure (for example, road link ID). Or broadcasting a broadcast signal including a traffic light ID, and receiving the broadcast signal from a traffic signal controller and interpreting identification information included in the broadcast signal to determine whether the traffic light being managed by the traffic signal controller is a control object. If the control target is included in the control target, the control signal conversion of the traffic light according to the command included in the broadcast signal. According to this, a single command (broadcast) is used to collectively control traffic light of lower tier belonging to any upper tier (for example, area A) (for example, roads located in area A and traffic lights installed on the road). Signal conversion control becomes possible.
- a single command (broadcast) is used to collectively control traffic light of lower tier belonging to any upper tier (for example, area A) (for example, roads located in area A and traffic lights installed on the road). Signal conversion control becomes possible.
- the traffic control center 100 collects road information for controlling signal conversion of traffic lights.
- road information to be collected for example, the current driving speed of the vehicle traveling on the road, the number of lanes of the road, the slope, the degree of curvature, the presence or absence of speed bumps, the condition of the road surface, the weather, the amount of traffic, the waiting queue, the time zone Etc. may be included.
- the road information collected as described above is processed as it is or processed, and is displayed on the broadcast signal as part of the control command, or the offset time for each traffic light calculated based on the collected road information is loaded on the broadcast signal as part of the control command and broadcasted through the broadcast network.
- the broadcast signal may be, for example, an analog broadcast using data communication such as frequency modulation (FM) or amplitude modulation (AM), or digital multimedia broadcasting (DMB) or digital audio broadcasting (DAB).
- Traffic control by digital broadcasting using data and command communication such as Terrestrial Digital Video Broadcasting (DVB-T), Portable Digital Video Broadcasting (DVB-H), and Media Forward Link Only (MFLO). From the center 100 or from a broadcasting station (not shown) connected to the traffic control center 100 via a wired or wireless network at once.
- such a broadcast signal is transmitted from a base station (not shown) connected through a wired or wireless network in the traffic control center 100, for example, a mobile communication network such as CDMA, WCDMA, Long Term Evolution (LTE), or a local area wireless communication network such as WIFI. It can also be sent out at once. That is, the broadcast signal may be broadcast in units of base stations.
- the broadcast signal 1 transmitted from the traffic control center 100 or a broadcasting station or a base station connected thereto includes segment data 10, hierarchical identification information 20, and a control command 30. do.
- the classification data 10 is data for distinguishing types of broadcast signals and informs that the information is for one of control at the time of display, signal control, update of the display table, or a combination thereof according to the property of the control command 30. .
- the identification information 20 of the hierarchical structure is information for identifying a traffic light to be performed, such as control at the time of start of display, signal control, update of a manifest table, etc. according to the control command 30. Indicates the minimum local range to which they belong. For example, when the identification information 20 means “national,” all traffic lights installed in the whole country are controlled, and when “meaning Seoul Geumcheon-gu” means all traffic lights installed in Seoul Geumcheon-gu, If it means “594 Geumcheon-ro, Geumcheon-gu, Seoul", all traffic lights installed at 594 Geumcheon-ro, Geumcheon-gu, Seoul will be controlled.
- the identification information 20 has a hierarchical structure for distinguishing the road and the area where the traffic light is installed.
- the hierarchical structure identification information 20 may have a code corresponding to each zone (corresponding to a small region) in which the entire region (for example, the nationwide) under the control of the traffic control center 100 is divided into a plurality of hierarchies. have.
- Each zone divided into a plurality of hierarchies may be, for example, a postal address based on an administrative district, which is an administrative unit that divides a country area for administrative purposes, or a postal code based on a recent newly implemented street address. Or it may be distinguished according to the road name code.
- identification information of a hierarchical structure is based on a newly implemented road name address.
- the scope of the present invention is not limited thereto, and the classification information may be classified into a plurality of hierarchies. Of course, various cases may be included in the scope of the present invention.
- each zone partitioned into a plurality of hierarchies has a structure in which an upper hierarchical zone includes one or more lower hierarchical zones, and each of the lower hierarchical zones repeats a classification included in only one upper hierarchical zone.
- a region ID representing a city (city, metropolitan city) / province, city / county / gu is higher hierarchy ( Hierarchies 1 and 2), and road ordinal numbers representing road names and road numbers can be classified to be lower hierarchies (tiers 3 and 4).
- a traffic light number for example, a traffic light ordinal
- the lowest layer of the identification information may be further included as the lowest layer of the identification information as layer 5.
- the road name address "594 Geumcheon-ro, Geumcheon-gu, Seoul,” representing the road on which the traffic light A is installed, is located in Seoul (Layer 1), Geumcheon-gu (Layer 2), and Geumcheon-ro.
- Layers may be divided into (layer 3) and 594 (layer 4), and traffic light number A (layer 5) may be converted into identification information of a hierarchical structure further including the lowest layer.
- FIGS. 4A to 4C Various examples of the hierarchical structure identification information included in the broadcast signal are illustrated in FIGS. 4A to 4C.
- N random natural number
- the total code length of the identification information also increases proportionally.
- the same number of bits is assigned to each layer, the number of bits of each layer may be appropriately changed, such as more bits are allocated to the lower layer than the upper layer.
- identification information when the information corresponds to layer 1, such as "national” or “Seoul,” identification information may be 2-bit data as “00” or "01". In the case of "Class 2,” such as “Geumcheon-gu, Seoul,” the identification information is "0103" and 4-bit data. Bit data. In this case, the layer information may be obtained from the data length (the number of bits) of the identification information.
- the identification information includes a layer code 410 and a detailed code 420.
- the hierarchy code 410 represents the lowest hierarchy of the region indicated by the identification information
- the detail code 420 represents a value for distinguishing the region within the lowest hierarchy.
- the hierarchy code 410 when corresponding to Tier 1, such as "National” or “Seoul,” the hierarchy code 410 is equal to “1”, but the detailed codes 420 are distinguished from each other as “0000” or "0001".
- the layer code 410 may be "2", and the detailed code 420 may be "0010".
- the layer code 410 may be "3” and the detailed code 420 may be "0005".
- the detailed codes may have the same value.
- the layer information may be obtained from the layer code 410 of the identification information.
- the identification information may be using a road name code determined according to the currently implemented road name address.
- the road name code consists of a 5-digit city and district code and a 7-digit road name number, and a traffic light number (m digit, m is an arbitrary natural number) may be added to the road name code and used as identification information.
- a traffic light number m digit, m is an arbitrary natural number
- the matching relationship between the road name code and the road name address may be based on the criteria provided by the Ministry of Public Administration and Security.
- the hierarchical structure can be classified according to the scale of the foliage, and the leaflet number can be used as identification information or postal code as identification information. could be.
- control command 30 included in the broadcast signal includes information for control at the time of appearance start, information for signal control, information for updating the appearance table, and so on. It will be described in detail with reference to.
- a broadcast signal when a control command is the same for a plurality of pieces of identification information, a broadcast signal may be configured as follows.
- ⁇ traffic> ⁇ / traffic> is identification data indicating a broadcast signal related to traffic signal control
- ⁇ id> ⁇ / id> is identification information of a hierarchical structure
- ⁇ act> ⁇ / act> is a control command. Indicates.
- the broadcast signal may be configured as follows.
- the broadcast signal may be configured as follows.
- the identification information of the hierarchical structure by using the identification information of the hierarchical structure, it is possible to collectively transmit a control command through one broadcast signal to all the traffic lights installed in a predetermined area. Through this, the amount of transmission data can be minimized, thereby reducing network facility cost and maintenance cost, minimizing network load, and simplifying the structure and command system of the traffic signal controller.
- the traffic control center 100 may receive status information of a controller and a traffic light transmitted from the traffic signal controller 200.
- the state information of the controller and the traffic light may include information about an abnormal state in the controller, a broadcast signal reception error, an operation error of the traffic light, and the like.
- the first traffic signal controller 200 includes a broadcast signal receiver 210 and a traffic light controller 220. According to an embodiment, the apparatus may further include a bidirectional communication unit 230. It is apparent that other traffic signal controllers are configured to have the same internal configuration as that of the first traffic signal controller 200, which will be described below with reference to the first traffic signal controller 200.
- the traffic signal controller 200 is installed in correspondence with each of the management traffic lights (including the non-virtual reference traffic lights) and manages the corresponding management traffic lights 250.
- the traffic signal controller 200 may be equipped with devices or devices corresponding to each component in a housing installed on the outer wall of the traffic light or a separate housing installed around the traffic light.
- two or more traffic signal controllers 200 may be installed for one management traffic light.
- the traffic light and the pedestrian traffic light may be divided into two or more groups and may be individually controlled by the plurality of traffic signal controllers 200.
- two or more traffic signal controllers 200 managing one management traffic light may have the same identifier.
- the broadcast signal receiver 210 receives a broadcast signal transmitted from the traffic control center 100.
- the broadcast signal transmitted from the traffic control center 100 is a data broadcast signal such as one of FM, AM or DMB, DAB, DVB-T, DVB-H, MFLO, etc., and is broadcasted through a predetermined broadcast channel.
- the signal receiver 210 may be one of an FM receiver, an AM receiver, a DMB receiver, a DAB receiver, a DVB-T receiver, a DVB-H receiver, and an MFLO receiver for receiving such a data broadcast signal in a corresponding broadcast channel.
- the traffic light controller 220 controls the signal conversion of the management traffic light 250 managed by the traffic signal controller 200. To this end, the traffic light control unit 220 determines whether the management traffic light 250 is included in the control target from the hierarchical identification information included in the broadcast signal, and applies the control command included in the broadcast signal only to the control target. Accordingly, the signal conversion of the management traffic light 250 is controlled.
- the management traffic light 250 is installed at any intersection or pedestrian crossing, and includes a traffic light and / or a walking traffic light in which signal conversion is performed in cooperation with each other.
- the traffic light control unit 220 will be described in detail with reference to FIG. 5.
- the traffic light controller 220 includes a broadcast signal analyzer 510, a determiner 520, and a control command performer 530.
- the error checking unit 540 may be further included.
- one or more components included in the traffic light control unit may be implemented in one or more forms of an algorithm, a software program, and the like implemented by a combination of program codes.
- the broadcast signal analyzer 510 analyzes the broadcast signal received by the broadcast signal receiver 210 and extracts segment data, identification information, a control command, and the like included in the broadcast signal.
- the data format of the broadcast signal has been described above with reference to FIG. 2.
- the broadcast signal analyzer 510 may include a decoder (not shown) capable of decoding the corresponding data format.
- the determination unit 520 determines whether the management traffic light 250 is an object of the control command from the hierarchical structure extracted from the broadcast signal.
- the hierarchical information is extracted from the identification information, and the classification data corresponding to the hierarchical information is extracted from an identification code such as a management signal previously stored in a memory (not shown).
- an identification code such as a management signal previously stored in a memory (not shown).
- control command execution unit 530 Only when the management traffic light 250 is included in the target of the control command, the control command execution unit 530 performs a control command included in the broadcast signal to perform a predetermined operation (adjustment at the time of start-up) of the management traffic light 250. , Signal conversion, update of manifest tables, etc.).
- the traffic light controller 220 may further include an error checker 540.
- the error checking unit 540 stores error information such as a traffic light error, a GPS error, a broadcast signal reception error, and the like as historical data, and immediately or at a predetermined schedule according to a predetermined criterion (for example, the severity of the error).
- a predetermined criterion for example, the severity of the error.
- the history data transmission in the error checking unit 540 may be performed through the bidirectional communication unit 230 to be described later.
- Traffic light error refers to a case where a short circuit or disconnection is detected through the current flowing in the circuit when the signal light is turned on or off.
- GPS error means that no GPS data is received or the GPS time does not change when checking the GPS signal, or that the GPS time still does not change or GPS data is not received after a certain time has elapsed after resetting the GPS unit.
- the broadcast signal reception error refers to a case in which an error occurs in the data packet or the error check counter data included in the data is not updated for a predetermined time or the counter value does not increase even if the broadcast signal is not received or received.
- the history of the identifier of the faulty traffic signal controller, the type of faulty module e.g., at least one of a traffic light, a GPS unit, a broadcast signal receiver, etc.
- an error occurrence time e.g., an error occurrence count
- an error occurrence count e.g., an error occurrence count
- the traffic signal controller 200 may transmit error information generated by the error checking unit 540, that is, an internal abnormal state of the controller and / or abnormal state information of a traffic light, to the traffic control center ( It may further include a bidirectional communication unit 230 for transmitting to 100.
- the bidirectional communication unit 230 may use a wired or wireless network, and for example, may transmit and receive data through a third generation and fourth generation or next generation mobile communication network such as CDMA, WCDMA, LTE, or a local area network such as WIFI. It may be a communication module to make.
- a third generation and fourth generation or next generation mobile communication network such as CDMA, WCDMA, LTE, or a local area network such as WIFI. It may be a communication module to make.
- the bidirectional communication unit 230 performs the bidirectional communication with the traffic control center 100 to exchange data and programs. Allow the action to be performed.
- the traffic control center 100 requests communication with the traffic signal controller 200 having a specific ID through a broadcasting network, the traffic signal controller 200 having the corresponding ID is transmitted through the bidirectional communication unit 230.
- the variable IP is assigned and the traffic control center 100 can be accessed.
- FIG. 6 is a flowchart illustrating a traffic signal control method according to an embodiment of the present invention
- FIG. 7 is a diagram illustrating examples for explaining a determination process according to the present invention.
- the flowchart illustrated in FIG. 6 is performed by each component of the traffic signal controller.
- the management signal lamp is included in the target of the control command. In this case, the control signal conversion of the management signal lamp is controlled.
- the broadcast signal receiver 210 receives a broadcast signal transmitted from the traffic control center 100 or a broadcast station (or base station) connected thereto through a broadcast network.
- the broadcast signal may be received through a broadcast channel such as FM, AM, DMB, DAB, DVB-T, DVB-H, MFLO.
- the broadcast signal analyzer 510 analyzes the broadcast signal received by the broadcast signal receiver 210 to extract hierarchical information in the identification information of the hierarchical structure.
- the hierarchical information in the hierarchical structure identification information is a value representing a region range to be controlled through a broadcast signal, as described above with reference to FIGS. 4A and 4B.
- the layer information may be extracted from the data length.
- the hierarchical code and the detailed code are divided as illustrated in FIG. 4B, the hierarchical code may be extracted as hierarchical information.
- the determination unit 520 extracts the classification data corresponding to the extracted hierarchical information about the management signal.
- the identification information of the management signal is stored in advance in the memory, and only the portion corresponding to the hierarchical information of the identification information is extracted as the classification data.
- the identification information 710 of the broadcast signal indicates "Seoul Geumcheon-gu" as "0103"
- this broadcast signal means that it is a control command for the entire traffic light installed in Geumcheon-gu, Seoul.
- the identification information of the management traffic light may be 10-bit data representing values from layers 1 to 5, for example, identification information of three management traffic lights is shown by reference numerals 722, 724, and 726.
- the hierarchical information of the identification information extracted in step 610 indicates hierarchical 2 (city / county / old hierarchical)
- only the bit data (upper 4-bit data) corresponding to the hierarchical information among the identification information such as the management signal is distinguished. It will be extracted as data. That is, the identification information 722 and 724 of the first and second management traffic lights are "0103", and the identification information 726 of the third management traffic light is extracted "0102" as distinguished data, which is then broadcasted in step 630.
- the identification information is compared with.
- the first and second management traffic lights are determined to be traffic lights installed in Geumcheon-gu, Seoul, and the signal conversion control according to the control command included in the broadcast signals. Will be done.
- the classification data of the third management traffic light is not the same as the identification information of the broadcast signal, the third management traffic light is determined to be a traffic light installed in a region other than Geumcheon-gu, Seoul and will maintain the existing signal conversion system.
- the case where the identification information has the data format illustrated in FIG. 4B is illustrated in FIG. 7B.
- the identification information 730 of the broadcasting signal indicates "Geumcheon-gu, Seoul Metropolitan City” of Tier 2 (City / Gun-gu Hierarchy) as “2 0010”
- this broadcasting signal is a control command for the entire traffic lights installed in Geumcheon-gu, Seoul. Means.
- the identification information 740 of the management signal may have detailed codes 740a to 740e corresponding to the layer codes of layers 1 to 5.
- the identification information extracted in step 610 is "Geumcheon-gu, Seoul", and the hierarchical information indicates layer 2, only bit data corresponding to the hierarchical information (detail code (which may be included as hierarchical code if necessary)) is used.
- the data is extracted as the division data 750. That is, "2 0010" which is the identification code of the layer 2 among the identification information 740 such as the management signal is extracted as the classification data, and this is compared with the identification information of the broadcast signal in step 630.
- the broadcast signal may be configured in the following XML format.
- the determination unit 520 compares the identification information extracted from the broadcast signal with the classification data such as the management signal extracted in step 620 to determine whether the management signal is included in the target of the control command included in the broadcast signal. If the identification information and the classification data are the same, it is determined that the management signal lamp is included in the target of the control command included in the broadcast signal, and if it is not the same, it is determined that it is not included.
- the traffic light control unit 220 When it is determined that the management traffic light is included in the target of the control command included in the broadcast signal, the traffic light control unit 220 performs the traffic light control according to the control command included in the broadcast signal in step 640. If it is determined that the management traffic light is not included in the target of the control command included in the broadcast signal, the traffic light control unit 220 maintains the existing signal conversion scheme regardless of the control command included in the broadcast signal in step 650.
- the traffic signal controller 200 analyzes the identification information of the hierarchical structure included in the broadcast signal to determine whether the management traffic light belongs to the target of the control command, and performs the control command only when it belongs.
- the above-described traffic signal control method may be performed by an automated procedure in time series order by a software program embedded in the traffic signal controller. Codes and code segments constituting the program can be easily inferred by a computer programmer in the art.
- the program is also stored in a computer readable information storage medium, and read and executed by the computer to implement the method.
- the information storage medium includes a magnetic recording medium, an optical recording medium and a carrier wave medium.
- FIG. 8 is a view for explaining the concept of a traffic signal control method according to an embodiment of the present invention. As illustrated in FIG. 8, it is assumed that traffic lights ID0 to ID4 are installed at intersections and / or crosswalks having a predetermined interval or an arbitrary interval on road sections collectively selected by the hierarchical structure identification information. .
- the waiting time at the traffic lights such as intersections or crosswalks is shortened and traffic flow is improved. Traffic jams will be reduced. To this end, it is necessary to operate such that the traffic light indicates a straight signal when the vehicle at the reference traffic light ID0 position moves and arrives at the next traffic light position so that signal conversion of the traffic light is performed in association with the vehicle traveling speed.
- the road sections collectively selected by the hierarchical structure identification information may consist of one or more road links.
- Road links refer to roads between two adjacent junctions (eg, intersections, yards, etc.).
- the traffic lights ID0 to ID4 installed on one or more road links of the collectively selected road sections are grouped into a reference traffic light sharing group G1 sharing one reference traffic light.
- the traffic lights ID0 to ID4 belonging to the reference traffic light sharing group G1 share any one of the traffic lights as the reference traffic lights, and when the signal presentation start time at which signal conversion of the traffic lights is started is determined, the signal presentation start time of the reference traffic light is started. It will be decided based on.
- the reference traffic light may be a traffic light actually installed in a road section, but may be a virtual traffic light that is not actually installed in some cases.
- the reference signal lamp is ID0 and the management signal lamps are ID1 to ID4.
- the reference signal ID0 which is not a virtual signal lamp, may also be regarded as a management signal lamp whose offset time, which will be described later, corresponds to zero.
- the management traffic light is installed in an intersection or a crosswalk in a road section, and includes a traffic light and a pedestrian traffic light in which signal conversion is performed in association with each other.
- a traffic light and a pedestrian traffic light in which signal conversion is performed in association with each other.
- four-way traffic lights installed at each crossroad and four pairs of pedestrian traffic lights that allow crossing of each crossroad may be included in the management signal.
- the two-way traffic light may be included.
- a pair of walking traffic lights may be included in the management traffic light.
- the start time of the signal manifestation of the reference signal light ID0 is defined as the reference start time, and the value is derived from the correlation between the distance between the reference signal light ID0 and the management signal lights ID1 to ID4 and the traveling speed of the vehicle when compared with the reference start time.
- the management traffic light is green when the vehicle passing through the point where the reference signal light ID0 is installed passes through the point where each management signal light is installed by advancing or delaying the start of signal manifestation of the management signal lights ID1 to ID4 by the offset time. This allows the vehicle to continue without stopping or waiting, thus creating a smooth traffic flow.
- the first management signal light ID1 is set to S1 / in accordance with the correlation between the running speed v of the vehicle and the distance S1 from the reference signal light ID0. It is preferable that the offset time of v is derived and set so that the time delayed by S1 / v from 0: 0 becomes the signal manifestation start time.
- the offset time of S2 / v and S3 / v is derived according to the correlation between the distances S2 and S3 of the vehicle's traveling speed v and the reference signal ID0, as well as the second and third management traffic lights ID2 and ID3.
- the time delayed by S2 / v and S3 / v from 0: 0 is preferably set to be the start time of signal manifestation of each management traffic light.
- the distance from the reference traffic light ID0 is S4.
- an offset time of -S4 / v is derived, and S4 is from 0: 0.
- the time point advanced by / v is set to be the start time of signal manifestation of the fourth management traffic light ID4.
- the driving speed v of the vehicle is not a speed at which the actual vehicle travels, but a signal interlocking speed linked with signal conversion of a traffic light to make a smooth traffic flow.
- the number of lanes, slopes, curvatures, speed bumps, etc. It may be a value that reflects actual road information collected, such as the presence or absence of roads, road conditions, weather, traffic volume, and time zone.
- This signal interworking speed is a different concept from the section speed information in the TPEG.
- the driving speed of the vehicle is the representative speed on the road (for example, the maximum speed of the driving speed, the speed of the long driving time, etc.), and the difference between the speed and the actual speed can be used by adjusting the pseudo distance (phase distance). Can be.
- a speed that is 10 to 20% slower than the running speed in clear weather can be set as the running speed of the vehicle and used as a parameter for calculating an offset time for determining the start time of signal manifestation of each management signal.
- at least one of the actually collected road information may be used as a factor for determining the driving speed, and the determining method may be calculated in the form of a first-order function, a second-order function, or a multiple-way multiple-order function.
- Such a method of determining the driving speed may be determined using statistical results through a plurality of experiments or measurements, which will be apparent to those skilled in the art, and thus detailed description thereof will be omitted.
- the above-described road information may be reflected with respect to the distance between traffic lights and not the traveling speed, which may be referred to as a phase distance.
- the offset time may be calculated as shown in Equation 1 below.
- Toffset offset time
- D phase distance
- V speed
- E deviation
- the equation for calculating the offset time may be expressed as a multi-way or a multi-way difference.
- the integrated traffic signal control using the offset time is performed using the identification information having a hierarchical structure, that is, the traffic signal control system according to another embodiment of the present invention is shown in FIG. Having the same configuration as the signal control system, the following will focus on the functional differences.
- Traffic signal control system so that the start of the predetermined signal manifestation in advance in the traffic lights that are collectively selected by the identification information of the hierarchical structure according to the road information currently collected in the traffic control center
- the traffic signal controller which manages the traffic lights collectively selected by the hierarchical structure identification information is received and analyzed for the traffic lights to be controlled.
- a suitable signal manifestation start time is determined and signal conversion of the signal lamp is controlled in accordance with the signal manifestation start time.
- a signal conversion having the same manifestation period occurs at a related traffic light later or faster by a predetermined offset time, so that traffic signals are sequentially converted to the vehicle's driving speed for the traffic light on the road.
- the flow is smooth and the traffic jam is eliminated.
- the broadcast signal transmitted from the traffic control center 100 has a format form as illustrated in FIG. 9A or 9B.
- 9A is a diagram illustrating an embodiment of a manifestation control information format according to the present invention
- FIG. 9B is a diagram illustrating an embodiment of a signal conversion control information format according to the present invention.
- the broadcast signal includes signal start control information for controlling signal start time of the first to n th traffic signal controllers 200 and signal conversion for controlling a signal conversion period of the first to n th traffic signal controllers 200. It is configured to have control information, respectively. According to an embodiment, time synchronization information for synchronizing the times of the first to n th traffic signal controllers 200 may be further included.
- the appearance start control information includes the classification data 910 for distinguishing whether the information is for control at the time of appearance start or information for signal control, and the region range to be subjected to the collective control.
- Group identification 911 having an identification information 911 having a hierarchical structure, an ID for identifying a reference traffic light sharing group for which the current presentation start time is to be adjusted, and a reference start indicating a time point at which signal presentation of the reference traffic light starts. Includes a control command consisting of time data 913, manifestation information 914 indicating the signal conversion order, period, etc. of the management traffic light, and an offset parameter 915 for calculating the offset time of the management traffic light when compared with the reference traffic light. .
- the offset parameter 915 includes a driving speed for calculating an offset time based on currently collected road information, or predefined offset times 915-1 to 915-n of the management traffic lights belonging to the reference traffic light sharing group. It may be arranged in order. The order in which the offset time of the management traffic light is arranged is defined in advance, and the management signal light may also store data about the order (that is, the order in which the offset time is arranged) in the reference traffic light sharing group.
- the group identifier 912 may use an ID of a road section.
- the traffic light ID can be extended after the ID of the road section to use ordinal numbers. For example, if the ID of a road is 100, the traffic light IDs installed on the road are 101, 102, 103,... Or the like, 1001, 1002, 1003,... And the like.
- the ordinal order is irrelevant to the actual position and can be used in the installation order or the traveling order.
- the signal conversion control information includes the classification data 920 for distinguishing whether the information is for control at the time of starting the start or the information for signal control, and the region range to be subjected to the collective control.
- a controller having a hierarchical structure identification information 921, start time data 922 having start time information on which a signal conversion operation is performed, and an ID for identifying the first to n th traffic signal controllers 200; Identifier 923, traffic light number data 924 for selecting the traffic lights controlled by the first to nth traffic signal controllers 200, signal sequence data 925 for the signal change order of each traffic light, and the changed signals
- a control command is made up of signal period data 926 for the holding time of.
- the order in which the signals are changed by the signal sequence data 925 consists of various manifestations sequentially such as [stop ⁇ go straight ⁇ stop], [stop ⁇ go straight ⁇ left turn ⁇ stop], [stop ⁇ turn left ⁇ stop ⁇ go straight ⁇ stop], etc. It has a ring structure and repeats based on a certain period.
- the appearance appearing at the very beginning of the signal conversion period is called the appearance time, and the appearance time at all the traffic lights is assumed to mean the vehicle going straight. That is, the sine time displayed according to the signal conversion control command immediately after the start time of appearance in the management signal lamp turns green lighting indicating vehicle progress.
- Traffic light numbers 0 to 7 in the direction of north, east, south, and west from the direction of the intersection of the intersection, and add w after the relevant traffic light number for pedestrian traffic lights.
- traffic light numbers do not need to be named, and pedestrian traffic lights can be named w only to distinguish them from pedestrian traffic lights.
- the types of signals may be as follows.
- the walking signals of 9 to 12 may be omitted because they are connected to and interlocked with the same circuit as the signals of the corresponding driving lanes.
- an example of the range display according to the signal order data 925 is as follows.
- manifest command has been described as having an XML format, the scope of the present invention is not limited thereto, and may have a frame structure or have no relation to the definition order of data.
- control command ⁇ act cmd> can be divided into “copy”, “edit” and “delete”.
- copy means rewriting the entire data or updating the contents of the existing one
- delete means deleting the data (present type, table number, traffic light signal, etc.) of the corresponding content
- edit means to replace some of the content. For example, if there is no content between commas and commas, the original data is retained.
- the predefined signal conversion type (sig type) follows the type of 1
- the detail code ( If no) is 3
- the type of manifestation, the offset time, the time of each signal in the manifestation, the signal conversion type, and the like may be determined in advance if not defined in advance.
- the broadcast signal includes time synchronization information including time data, which is information for synchronizing the times of the first to n th traffic signal controllers 200 to eliminate time error between the first to n th traffic signal controllers 200, as a control command.
- it may be expressed in seconds in a time range of one week.
- the time synchronization of the first to n-th traffic signal controllers 200 may be matched by the above-described time synchronization information, and signal conversion of a traffic light controlled according to this is controlled to be interlocked with each other under the same time reference.
- the first to n-th traffic signal controller 200 includes a GPS unit (not shown), time synchronization is possible between the traffic signal controllers using GPS time data included in the GPS signal. Time synchronization information may be omitted from the signal. Time synchronization using GPS signals will be apparent to those skilled in the art, and thus a detailed description thereof will be omitted.
- the traffic light control part of the traffic signal controller interprets the broadcast signal received by the broadcast signal receiver, and according to the result Determine the offset time with the reference traffic lights in the reference traffic light sharing group.
- the signal manifestation start time of the management traffic light is determined so that the signal manifestation of the management traffic light is started at a time delayed by an offset time determined from the reference start time which is the signal manifestation start time of the reference traffic light and outputs a control signal for controlling signal conversion of the management traffic light.
- the offset time is negative, the time point advanced by the absolute value of the offset time will be the start time of signal manifestation of the management signal.
- This traffic light control unit will be described with reference to FIG. 10.
- the traffic light controller 1000 may include a broadcast signal analyzer 1010, a determiner 1020, a time synchronizer 1030, an offset setting unit 1040, and a signal conversion controller 1050. ).
- the apparatus may further include an error checking unit 1060 and / or a signal interlocking speed output unit 1070.
- one or more components included in the traffic light control unit may be implemented in one or more forms of an algorithm, a software program, and the like implemented by a combination of program codes.
- the broadcast signal analyzer 1010, the determiner 1020, and the error checker 1060 include the broadcast signal analyzer 510, the determiner 520, and the error checker of the traffic light controller 220 shown in FIG. 5.
- the difference between performing the same function as the unit 540 will be described below.
- the time synchronizer 1030, the offset setting unit 1040, and the signal conversion control unit 1050 correspond to the control command execution unit 530 of the traffic light control unit 220 shown in FIG. 5, and the function thereof will be described in detail. Let's do it.
- the broadcast signal analyzer 1010 analyzes a broadcast signal received by the broadcast signal receiver 210 and extracts offset parameters, signal control data, time data, and the like suitable for a management signal included in the broadcast signal.
- the broadcast signal format has been described above with reference to FIG. 9.
- the determination unit 1020 determines whether the management signal is included in the target of the control command by using the identification information of the hierarchical structure extracted as a result of the analysis of the broadcast signal. Only when it is determined that the management signal is included in the target of the control command, components such as the time synchronizer 1030, the offset setting unit 1040, and the signal conversion control unit 1050 corresponding to the control command execution unit are activated. The operation described below may be performed.
- the management traffic lights belonging to the reference traffic light sharing group need to have the same system time, and the signal light control unit 1000 includes a time synchronizer 1030 to synchronize the system time.
- the time synchronizer 1030 synchronizes the system time based on the GPS signal received from the satellite via the GPS unit, thereby allowing the reference signal lamp belonging to the same reference signal sharing group and It is possible to prevent the occurrence of time error with other management traffic lights.
- the time synchronizer 1030 may reset the previous system time and set a time corresponding to the time data to the current system time.
- the time signal may be prevented from occurring with the reference signal and other management signals belonging to the reference signal sharing group.
- the offset setting unit 1040 sets the offset time of the management signal by using the offset parameter extracted by the broadcast signal analyzer 1010.
- the offset setting unit 1040 reads the distance between the reference signal and the management signal stored in advance from the memory, and defines the traveling speed and the distance in advance.
- the value calculated by applying the algorithm is set to the offset time of the management signal lamp.
- the ratio of distance and travel speed may be set to an offset time.
- the traveling speed may be, for example, at least one of the current traveling speed of the road traffic vehicle, the number of lanes of the road, the slope, the degree of curvature, the presence or absence of a speed bump, the condition of the road surface, the weather, the amount of traffic, the time zone, and the like. It may be a value reflecting information.
- the offset setting unit 1040 corresponds to the order of the management traffic lights according to the order of the management traffic lights in the predefined reference signal sharing group.
- the offset time may be extracted and set as the offset time of the management signal lamp. In this case, information on the distance between the reference traffic light belonging to the same reference signal sharing group and all the management traffic lights is secured in advance in the traffic control center 100, and the value obtained by dividing each distance by the traveling speed reflecting the currently collected road information is obtained. It may be pre-calculated as an offset time of each management signal and included in a broadcast signal to be broadcast.
- the signal conversion control unit 1050 sets a time delay delayed by the offset time set by the offset setting unit 1040 from the reference start time of the reference signal lamp according to the system time set by the time synchronizer 1030 as a signal manifestation start time of the management signal lamp.
- the control signal for outputting the periodic signal conversion for the management signal lamp, that is, the appearance of the appearance signal, is outputted to the management signal lamp.
- the management traffic light is provided before the reference traffic light.
- the management traffic light is advanced from the reference start time by a time corresponding to the absolute value of the offset time. Set to the start time of the signal manifestation
- the signal conversion control unit 1050 extracts and compares a controller identifier and starts time data when it corresponds to the traffic signal controller, Traffic light number data, signal sequence data, and signal period data are extracted to update the manifest table of the management traffic light. That is, the traffic light (traffic light and / or pedestrian traffic light) corresponding to the traffic light number data among the management traffic lights has a signal period corresponding to the signal period data according to the signal change order according to the signal order data at a time corresponding to the start time data.
- the control signal for repeatedly performing signal conversion can be output as a management signal.
- the signal conversion controller 1050 obtains a time difference between the existing signal manifest and the new signal manifest, and the time difference is By counting how many manifestations will occur while you are there, you can increase or decrease the time of each manifestation to ensure that the new signal manifestation you want is targeted to begin at the desired point in time. In this case, it is possible to change only the time of a specific manifestation or to increase or decrease the time of the entire manifestation by an even ratio.
- the traffic signal controller 200 may further include a signal interlocking speed output unit 1070.
- the signal interlocking speed output unit 1070 relates to the traveling speed inversed using the distance between the reference signal lamp and the management signal lamp from the driving speed information included in the offset parameter extracted from the analysis of the broadcast signal or the offset time included in the offset parameter.
- Information is output using visual means such as text, symbols, graphics, or audible means such as voice so that the driver on the road can check.
- the LCD or LED display unit is further provided around the traffic light so that the signal interlocking speed may be displayed as a graphic, a letter or a symbol, or a speaker is further provided near the traffic light so that the signal interlocking speed may be output as voice information.
- the signal interlocking speed output unit 1070 transmits signal interlocking speed information by communicating with a communication terminal (for example, a navigation device) mounted on a vehicle traveling on a corresponding road by using a short range wireless communication method.
- a communication terminal for example, a navigation device
- the corresponding information may be checked through an output module (display unit or speaker) provided in the communication terminal.
- a signal interlocking speed for making a smooth traffic flow on the road is assumed, and signal conversion of a traffic light is sequentially performed accordingly. Therefore, if the driver driving on the road is provided with a signal interlocking speed interlocked with the current signal conversion, there is no need to overspeed, so that safe driving is possible, and do not wait at the traffic light may help economic driving.
- the information on the signal interlocking speed is registered in the traffic control center 100.
- the information on the signal interlocking speed on the road corresponding to the vehicle location information is transmitted from the traffic control center 100 to the vehicle through a broadcasting network. It could be broadcast.
- a communication terminal mounted in a vehicle extracts information on a signal interworking speed included in a received broadcast signal, converts the information into a form that can be checked by a driver, and outputs the information. For example, it may be displayed as graphics, letters or numbers on a portion of the screen display unit, or may be output as a voice through a speaker.
- the signal interlocking speed may be used as information of a cruise function that enables constant speed driving without connecting the vehicle's accelerator by stepping on the vehicle's accelerator.
- a manifest table for signal conversion may be basically stored in a memory.
- the present table may be one or several, and may vary depending on conditions such as weather, rush hour, time zone, weekdays, holidays, night, etc., or may be used in combination. Even if the types and the order of the signal manifestations are the same, the holding time of each signal manifestation may vary according to the above conditions.
- the manifest table may have a form such that a traffic light in all directions or a traffic light in some directions flicker when an accident occurs on the road or when the road is closed. Alternatively, even when a broadcast signal is not received for a certain time due to a disaster, it may be determined as a disaster situation, and a predetermined constant manifestation may appear, such as causing a yellow traffic light to blink.
- manifest tables can be updated by editing, deleting or adding them.
- the update of the manifest table may be performed based on the broadcast signal analysis result when the signal conversion control information is included in the broadcast signal.
- FIG. 11 is a flowchart illustrating a traffic signal control method according to another embodiment of the present invention.
- the flowchart illustrated in FIG. 11 is performed in each component of the traffic signal controller, and according to a method of controlling signal conversion of a management signal when receiving a broadcast signal through a broadcast network.
- the broadcast signal receiver receives a broadcast signal transmitted from the traffic control center 100 through a broadcast network.
- the broadcast signal may be received through a broadcast channel such as FM, AM, DMB, DAB, DVB-T, DVB-H, MFLO.
- the broadcast signal analyzer 410 analyzes the broadcast signal received by the broadcast signal receiver 210. Since the broadcast signal has the division data as illustrated in FIG. 9, it is possible to determine whether the broadcasting data is the start control information, the signal conversion control information, or the time synchronization information according to the result of extracting and analyzing the division data.
- the data included in the broadcast signal may be included in the analysis process of the broadcast signal. Extraction process is included.
- the determination according to steps 610 to 630 of FIG. 6 may be performed, and subsequent steps may be performed only when the determination result management signal is included in the target of the control command. If the determination result management traffic light does not belong to the object of the control command, it is sufficient to maintain the existing signal conversion scheme, and do not proceed to the steps to be described later.
- step 1130 If it is determined that the management traffic light belongs to the target of the control command, the process of step 1130 or less is performed. Details are as follows.
- the time synchronizer 1030 uses the time data extracted from the broadcast signal to determine the system time of the traffic signal controller 200. Ensure time synchronization with reference traffic lights and other traffic signal controllers.
- the time synchronizer 1030 uses the GPS unit separately provided in the traffic signal controller 200 to determine the GPS time. It estimates and synchronizes the system time of the traffic signal controller 200 with the corresponding time to time-synchronize with the reference traffic light and other traffic signal controllers.
- the offset setting unit 1040 sets the offset time of the management signal by using the offset parameter extracted by the broadcast signal analyzer 1010.
- the offset setting unit 1040 reads the distance between the reference signal and the management signal stored in advance from the memory in step 1152, and the driving speed in step 1154.
- the offset time of the management signal is calculated by applying the and distances to a predefined algorithm.
- the offset setting unit 1040 performs an offset corresponding to an order of management traffic lights in a predefined reference signal sharing group. Extract the time and set it to the offset time of the management traffic light.
- the signal conversion control unit 1050 at step 1160 delays the starting point of the signal manifestation time of the management traffic light from the reference start time of the reference traffic light according to the system time set by the time synchronizer 1030 by an offset time. Set to.
- the signal conversion controller 1050 outputs a control signal to the management signal lamp such that the appearance of the management signal lamp is started at the newly set signal manifestation start time.
- the vision time may be a signal (for example, a green lighting signal) for driving a vehicle traveling in a predetermined direction.
- the signal conversion control unit 1050 extracts the start time data, the traffic light number data, the signal sequence data, and the signal period data with respect to the corresponding controller identifier in step 1180 to display the manifest table of the management signal lamp. Will be updated.
- the above-described traffic signal control method may be performed by an automated procedure in time series order by a software program embedded in the traffic signal controller. Codes and code segments constituting the program can be easily inferred by a computer programmer in the art.
- the program is also stored in a computer readable information storage medium, and read and executed by the computer to implement the method.
- the information storage medium includes a magnetic recording medium, an optical recording medium and a carrier wave medium.
- the concept of the virtual traffic light may be introduced, and the ID of the traffic signal controller may be assigned to the intersection where the actual traffic light is not installed, and the signal conversion period for the virtual traffic light may be transmitted by broadcasting.
- the vehicle running in the vicinity may also receive the broadcast signal through a navigation device, etc., to grasp the traffic light signal in the traveling direction, and use it as a traffic light when guiding a route.
- the signal may be displayed on the screen display unit or may be output as audio through a speaker or the like so that the user may recognize it visually.
- an apparatus that receives a broadcast signal such as a navigation device installed in a vehicle, displays an interval and state of traffic light conversion at an intersection, displays a time when a straight signal is to come in later, or performs an operation of stopping the engine in the air.
- This broadcast signal can be used as a signal for controlling the operation of the engine. That is, the remaining time of the next straight signal.
- it may be used as a vehicle control signal for notifying the next signal cycle and sequence, or receiving a signal such as a traffic light installed in a traveling direction when the vehicle is in progress and stopping or slowing the vehicle when the signal is red.
- the identification information of the hierarchical structure in forming the identification information of the hierarchical structure, it may be configured to divide a small area by dividing it into a predetermined size using longitude and latitude information, and may be configured by using other aspects in addition to such a geographical aspect.
- the identification information ie, road link ID and / or traffic light ID
- the identification information may be classified to have a hierarchical structure according to the evacuation system, or may be classified to have different identification information at the time of commencement and time of work.
- one traffic signal controller may have different identification information (ID) according to different classification schemes, and if necessary, control commands according to classification schemes other than the classification scheme currently subject to signal conversion control may be provided. You can also take care of it. In this case, a separate identifier for each classification scheme may be needed.
- the road sections collectively selected by the hierarchical structure of the identification information included in the broadcast signal do not need to consist of only straight lines, and the road links corresponding to the shortest paths for a given vehicle to travel from the starting point to the destination. May be a connected section.
- the road links corresponding to the shortest paths for a given vehicle to travel from the starting point to the destination. May be a connected section.
- it may include not only going straight but also turning left or right.
- identification information corresponding to different classification systems may be shared and used.
- the classification system for guiding the shortest route of the ambulance described above would be useful only in the vicinity of the hospital and would be meaningless at a distance away from the hospital. Therefore, the offset time is adjusted to be used by the ambulance that informs the shortest route according to the classification system for emergency rescue in the vicinity of the hospital, and the offset time can be adjusted so that the signal conversion is interlocked according to the conventional classification system at a place far from the hospital. There will be. For example, even in a conventional classification scheme, an offset time may be adjusted by adjusting the start time of manifestation.
- the entire area controlled by the traffic control center may be classified by using a classification system in the X-axis (for example, east-west) direction and a classification system in the Y-axis (north-north) direction, and the present invention may be applied.
- Each traffic signal controller should be able to predefine identification information according to the X-axis classification system and the Y-axis classification system and other information required for signal conversion control or be transmitted from the traffic control center.
- the traffic light control is optimized so that the traffic flows smoothly in the X-axis direction, there is no big problem even if the present time is accelerated or delayed.
- the Y-axis offset time calculated in the state that can be optimized for the road with the most traffic or the congested road in the Y-axis direction, and the time to start the present time in the X-axis direction are not impeded properly. Or control by delaying, the vehicle using the roads in the X-axis direction and the roads in the Y-axis direction can be smoothly progressed at the same time.
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Abstract
Description
Claims (17)
- 관리 신호등의 신호 변환을 제어하는 교통 신호 제어 장치로서,방송망을 통해 교통 관제 센터로부터 송출된 방송 신호를 수신하는 방송 신호 수신부-여기서, 상기 방송 신호는 계층적 구조의 식별정보 및 제어 명령을 포함함-; 및상기 계층적 구조의 식별정보에 따라 상기 관리 신호등이 상기 제어 명령의 대상에 속하는지 여부를 판별하고, 상기 관리 신호등이 제어 대상에 포함되는 경우에 한하여 상기 제어 명령에 따른 신호 변환이 이루어지도록 하는 제어 신호를 출력하는 신호등 제어부를 포함하는 교통 신호 제어 장치.
- 제1항에 있어서,상기 계층적 구조의 식별정보는, 상기 교통 관제 센터에서 관할하는 전체 지역이 신호등이 설치되어 있는 배타적인 복수의 계층에 따른 소 지역으로 구분될 때, 상기 제어 명령에 따른 일괄적인 신호 변환이 수행될 하나 이상의 소 지역을 식별하기 위한 정보인 것을 특징으로 하는 교통 신호 제어 장치.
- 제2항에 있어서,상기 계층적 구조의 식별정보는 계층이 낮아짐에 따라 데이터의 비트수가 증가하는 구조를 가지는 것을 특징으로 하는 교통 신호 제어 장치.
- 제3항에 있어서,상기 계층적 구조의 식별정보의 비트수로부터 상기 제어 명령의 대상이 되는 소 지역의 계층을 구분하기 위한 계층정보가 추출되는 것을 특징으로 하는 교통 신호 제어 장치.
- 제2항에 있어서,상기 계층적 구조의 식별정보는, 상기 제어 명령의 대상이 되는 소 지역의 계층을 나타내는 계층코드와, 상기 소 지역을 동일 계층의 타 소 지역과 구분하기 위한 상세코드를 포함하는 것을 특징으로 하는 교통 신호 제어 장치.
- 제2항에 있어서,상기 계층적 구조의 식별정보는 도로명 주소에 따른 도로명코드 혹은 지번 주소에 따른 우편번호를 포함하는 것을 특징으로 하는 교통 신호 제어 장치.
- 제1항에 있어서,상기 신호등 제어부는,상기 방송 신호를 분석하는 방송 신호 분석부;상기 방송 신호에서 추출된 시간 동기용 시간 데이터 혹은 GPS 유닛을 통해 추정한 GPS 시간을 이용하여 상기 관리 신호등의 시스템 시간을 상기 기준 신호등과의 시스템 시간과 동기화하는 시간 동기부;상기 방송 신호에서 추출된 오프셋 파라미터를 이용하여 상기 오프셋 시간을 설정하는 오프셋 설정부; 및상기 기준 신호등의 신호 현시 개시 시점으로부터 상기 오프셋 시간만큼 지연된 시점에서 상기 관리 신호등의 신호 현시가 개시되도록 하는 제어 신호를 출력하는 신호 변환 제어부를 포함하는 것을 특징으로 하는 교통 신호 제어 장치.
- 관리 신호등의 신호 변환을 제어하는 교통 신호 제어 장치에서 수행되는 교통 신호 제어 방법으로서,방송망을 통해 교통 관제 센터로부터 송출된 방송 신호를 수신하는 단계-여기서, 상기 방송 신호는 계층적 구조의 식별정보 및 제어 명령을 포함함-;상기 방송 신호를 분석하여 상기 계층적 구조의 식별정보의 계층정보를 추출하는 단계;상기 관리 신호등의 식별정보 중 상기 계층정보에 상응하는 구분데이터를 추출하는 단계;상기 방송 신호의 식별정보와 상기 구분데이터를 비교하여 상기 관리 신호등이 상기 제어 명령의 대상에 속하는지 여부를 판별하는 단계; 및상기 판별 결과 상기 관리 신호등이 제어 대상인 경우 상기 제어 명령에 따른 신호 변환이 이루어지도록 하는 단계를 포함하는 교통 신호 제어 방법.
- 제8항에 있어서,상기 계층적 구조의 식별정보는, 상기 교통 관제 센터에서 관할하는 전체 지역이 신호등이 설치되어 있는 배타적인 복수의 계층에 따른 소 지역으로 구분될 때, 상기 제어 명령에 따른 일괄적인 신호 변환이 수행될 하나 이상의 소 지역을 식별하기 위한 정보인 것을 특징으로 하는 교통 신호 제어 방법.
- 제9항에 있어서,상기 계층적 구조의 식별정보는 계층이 낮아짐에 따라 데이터의 비트수가 증가하는 구조를 가지는 것을 특징으로 하는 교통 신호 제어 방법.
- 제10항에 있어서,상기 계층적 구조의 식별정보의 비트수로부터 상기 제어 명령의 대상이 되는 소 지역의 계층을 구분하기 위한 계층정보가 추출되는 것을 특징으로 하는 교통 신호 제어 방법.
- 제11항에 있어서,상기 관리 신호등의 식별정보 중 상기 계층정보에 상응하는 비트수만큼의 상위 비트데이터가 상기 구분데이터로 추출되는 것을 특징으로 하는 교통 신호 제어 방법.
- 제9항에 있어서,상기 계층적 구조의 식별정보는, 상기 제어 명령의 대상이 되는 소 지역의 계층을 나타내는 계층코드와, 상기 소 지역을 동일 계층의 타 소 지역과 구분하기 위한 상세코드를 포함하는 것을 특징으로 하는 교통 신호 제어 방법.
- 제13항에 있어서,상기 관리 신호등의 식별정보 중 상기 계층코드와 동일한 계층코드를 가지는 식별코드가 상기 구분데이터로 추출되는 것을 특징으로 하는 교통 신호 제어 방법.
- 제9항에 있어서,상기 계층적 구조의 식별정보는 도로명 주소에 따른 도로명코드 혹은 지번 주소에 따른 우편번호를 포함하는 것을 특징으로 하는 교통 신호 제어 방법.
- 제8항에 있어서,상기 제어 명령에 따른 신호 변환이 이루어지도록 하는 단계는,상기 방송 신호의 분석 결과에 따라 기준 신호등과의 오프셋 시간을 결정하는 단계; 및기준 개시 시간으로부터 상기 오프셋 시간만큼 지연된 시점과 관리 신호등의 신호 현시 개시 시점이 일치하도록 상기 관리 신호등의 신호 변환을 제어하는 제어 신호를 출력하는 단계를 포함하는 것을 특징으로 하는 교통 신호 제어 방법.
- 제8항 내지 제16항 중 어느 한 항에 기재된 교통 신호 제어 방법을 수행하기 위해 디지털 처리 장치에 의해 실행될 수 있는 명령어들의 프로그램이 유형적으로 구현되어 있으며 디지털 처리 장치에 의해 판독될 수 있는 기록매체.
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US14/234,594 US9269262B2 (en) | 2011-08-05 | 2012-07-02 | Apparatus and method for controlling traffic signals using identification information having hierarchical structure |
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CN103733236A (zh) | 2014-04-16 |
CN103733236B (zh) | 2016-01-20 |
US9269262B2 (en) | 2016-02-23 |
KR20130015802A (ko) | 2013-02-14 |
US20140139358A1 (en) | 2014-05-22 |
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