CN100511323C - Intelligent traffic control system for controlling access connection traffic flow - Google Patents
Intelligent traffic control system for controlling access connection traffic flow Download PDFInfo
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- CN100511323C CN100511323C CNB2007101650026A CN200710165002A CN100511323C CN 100511323 C CN100511323 C CN 100511323C CN B2007101650026 A CNB2007101650026 A CN B2007101650026A CN 200710165002 A CN200710165002 A CN 200710165002A CN 100511323 C CN100511323 C CN 100511323C
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Abstract
The invention relates to an intelligent traffic control system for controlling traffic stream in intersection. The control system is composed of a traffic signal controller, a center computer, an Ethernet communication system, a traffic lamp in intersection, and related equipment. The traffic signal controller adopts a high-accuracy real-time clock chip for providing accurate clock signal and effectively improving the accuracy of time sequence of lamp color and simultaneously can display and set time and calendar information. The traffic signal controller has a vehicle inductive detection control interface for inputting real-time traffic stream information. The microprocessor of the signal controller system can an I/O port expanded by a programmable logic controller CPLD and is used for driving the traffic lamp after photoelectrical isolation and drive circuit so as to achieve reliable color output of traffic lamp. In the invention, the signal controller is directly connected with the Ethernet through the Ethernet controller, which can effectively improve the data transmission real-time performance and reliability. The monitor center analyzes and processes the traffic stream data according to the history traffic stream information as well as the real-time traffic stream information of each intersection, and generates an optimal control scheme by an intelligent optimization method, thereby achieving regional coordination control of urban traffic stream and maximally improving the traffic efficiency of the urban traffic stream.
Description
Technical field
The present invention relates to a kind of intelligent traffic control system of controlling access connection traffic flow.
Background technology
There is following open defect in domestic existing traffic control system: 1, existing crossing traffic teleseme universal functionality is limited, and application lacks flexibility on it expands light color control mode, induction control, autodiagnosis and function.2, possesses communication function, but mostly be the low-speed serial communication interface, be difficult to satisfy reliability, the real-time requirement of system, cause the different transport needs that under different traffic period and bursty state, produced often need maintain traffic order so that manpower is auxiliary; The minority traffic signaling equipment provides Ethernet interface, but or use serial ports to change the interfacing equipment of network, perhaps the network chip pin of Shi Yonging is many, the control complexity costs an arm and a leg.3, the general transmission range of network topology structure of existing signal controlling machine system employing is short, and the antijamming capability of the long more then data transmission of distance is poor more, and implementation is quite complicated, expends huge.4, existing traffic control system seldom utilizes the advanced intelligent algorithm that historical wagon flow and real-time traffic flow information are analyzed the generation optimal case, realizes the Based Intelligent Control to urban traffic flow.
Summary of the invention
The object of the invention is to make full use of existing advanced technology, provides that a kind of failure rate is low, real-time is high, control mode intelligent traffic control system flexibly.
Intelligent traffic control system of the present invention is by Surveillance center, the ethernet communication system, and traffic signal controlling machine, belisha beacon and relevant device are formed.In this intelligent traffic control system, signal controlling machine can move inner intrinsic scheme control crossing traffic signal lamp, can make amendment to scheme by close friend's man-machine interface simultaneously.The projecting point of system is that signal controlling machine can be gathered the crossing traffic stream information in real time, and in conjunction with ethernet technology the real-time traffic stream information is passed to Surveillance center by optical fiber, Surveillance center is according to the historical car flow information in the system database, utilize advanced algorithm that this cycle real-time traffic stream information is analyzed, predict the wagon flow situation of next signal period and generate the optimum control scheme, realize that the traffic zone of entire city is coordinated control.Crossing Surveillance center platform can show access connection traffic flow situation and traffic control scheme in real time simultaneously, and can make amendment to existing traffic plan according to the crossing actual conditions, passes to the crossing signal controlling machine under transmission system, improves magnitude of traffic flow control.Grid communication adopts ICP/IP protocol to realize that reliability and real-time are good, Surveillance center computer control INTERFACE DESIGN artificial actual crossing, flexibly, intuitively.
This system's traffic signal controlling machine uses PIC advanced microprocessor of series and programmable logic controller (PLC) CPLD to form core control circuit, provides accurate clock signal by the precision interval clock circuit for system, realizes the reliable output of system's light color.The communication aspect, adopt the independent ethernet controller realization crossing traffic signal controlling machine of 28 pins and the tcp/ip communication of Surveillance center's computing machine, signal controlling machine is equipped with two-way RS485 interface simultaneously, one the tunnel is used for the collection vehicle detection signal, one tunnel system reserves, and makes interface mode more flexible, convenient.Signal controlling machine has been expanded pluggable keyboard and LED interface, can easily teleseme equipment be debugged at the scene and the timing scheme be made amendment.
The present invention has following advantage: 1, adopt the independent ethernet controller of one piece of 28 pin to realize ICP/IP protocol, cost is low, and is easy to use, realized that traffic signal controlling machine is directly by the Ethernet interface access network based on ethernet.2, control mode is various, and the signal function is moved inner intrinsic scheme control traffic flow, also can revise traffic plan by friendly man-machine interface and come access connection traffic flow is controlled; Possesses the traffic responsive control function; Projecting point is to realize satisfying the need mouthful remote monitoring of signal controller in Surveillance center.3, system can according to the telecommunication flow information of real-time detection, use the wagon flow situation in advanced intelligent next cycle of algorithm predicts in conjunction with historical data, generates the optimum control scheme, reduces the mean delay time and the stop frequency of vehicle, improves crossing wagon flow traffic volume.4, use ethernet technology in conjunction with optical fiber, system adopts optical fiber as transmission medium, long transmission distance, and antijamming capability is strong, can effectively improve the reliability and the real-time of system data transmission.5, signal controlling machine extended keyboard and LED display interface can be debugged equipment and be safeguarded at the scene easily, and the signal controlling machine state is carried out manual intervention.
Description of drawings
Fig. 1 is the signal controlling machine system principle diagram.
Fig. 2 is the star-like networking topological model of urban traffic control.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is the signal controlling machine system principle diagram, mainly comprises five parts: PIC microcontroller, colored lights driving, vehicle detection, fault is tested oneself and ether networking.
The PIC microcontroller is the control core of signal controlling machine system, the gauge tap selection mode of start automatic detection signal controller panel, determine control model, enter the control corresponding handling procedure, carry out the basic signal controlling function of teleseme, the current scheme information of system led part shows signal controller, the user can use keyboard to revise controlling schemes.System also possesses RS-485 vehicle detection interface, vehicle detecting system with external detection to the wagon flow data pass to single-chip microcomputer by RS-485, single-chip microcomputer can carry out being directly used in after the analyzing and processing and improves traffic flow control these data, also these data can be passed to Surveillance center by ethernet controller through transmission system, Surveillance center is according to the historical car flow information in the system database, utilize advanced algorithm that this cycle real-time traffic stream information is analyzed, predict the wagon flow situation of next signal period and generate the optimum control scheme, realize the regional coordination control of entire city traffic.Signal period in the traffic signals control all is a time parameter in addition, and the accuracy of time is with regard to particular importance, so system adopts special clock circuit to provide the precise time benchmark for system's traffic signals control.Because the traffic lights of intersection are more, system adopts programmable logic controller (PLC) CPLD expansion I/O simultaneously, control signal is latched, through being directly used in signal lamp control after the photoelectricity isolation drive; For guaranteeing the reliability of traffic signals control, system software has increased CPU abnormality processing and green signal analysis, has also adopted security personnel's control circuit to substitute master control borad work when master control borad breaks down.
Fig. 2 is the star-like networking topological model of urban traffic control.In Fig. 2, the traffic control network system is placed a gigabit three-tier switch in the main website of Surveillance center, adopt kilomega optic fiber to connect the Layer 2 switch of each subregion respectively, form star-like gigabit core network, the subregion switch connects each regional center (RC) monitoring equipment and each intersection annunciator, when the crossing increased, the subregion switch all can be realized covering by piling up.Switch mostly processing speed itself is very high, but when many workstations are visited simultaneously, cause the switch network bottleneck problem easily, and the center three-tier switch provides enough switching bandwidth and circuit redundancies, can avoid the appearance of this problem, the real-time of effectively realization system control.
In traffic control system, the traffic control software (network operating system) that Surveillance center's operation is special, when Surveillance center will be when certain workstation be communicated by letter, according to TCP/IP protocol suite, it will create a transmission frame that comprises workstation address, according to destination address, determine an optimal path by its inner routing table scheme, be sent to certain switch of lower floor then according to this optimal path, by the destination-mac address in this switch detection Frame, controlling schemes is passed to the purpose workstation again.The media of system communication transmission adopts optical fiber, have that antijamming capability is strong, loss is low, capacity is big, volume is little, in light weight, lay advantages such as simple and confidentiality.
Therefore, the reliability and the real-time of this intelligent traffic control system are very good, can effectively improve traffic flow control.Simultaneously, this intelligent traffic control system possesses multiple control modes, and concrete control mode is as follows:
1, single-point control
The inner fixed cycle of signal controlling function operation, intrinsic scheme control traffic flow such as multi-period also can be revised these intrinsic traffic plans by friendly man-machine interface and come access connection traffic flow is controlled.
2, traffic responsive control
System possesses RS-485 vehicle detection interface, and vehicle detecting sensor is passed to single-chip microcomputer with detected outside wagon flow data by RS-485, can realize half induction control and two kinds of control modes of full induction control.
1. half induction control: half induction control is applicable to that the volume of traffic of major trunk roads is obviously greater than the subsidiary road volume of traffic, and the traffic intersection that the fluctuation of the subsidiary road volume of traffic is bigger, wagon detector is installed on the subsidiary road of crossing, signal controlling is carried out in transport need according to subsidiary road, the signal timing dial of half induction control is fairly simple, do not need to carry out complicated calculating, determine rightly just that major trunk roads are minimum when green, subsidiary road initial green the time, the green time-delay of unit and maximumly get final product when green.
2. full induction control: equal mounting vehicle detecting device on all entrance lanes at crossing, the green time of each signal phase is determined by the transport need on real-time detected each entrance lane of wagon detector, similar to half induction control, that each signal phase of full induction control all will be provided with is initial when green, the green time-delay of unit and maximum parameter such as when green.
Induction control ratio fixed cycle and multi-period control is superior: it can be in real time from the variation of dynamic response traffic flow.But still there is defective in induction control method: whether induction control can only detect has vehicle to arrive and is indifferent to and has how many vehicles to arrive, therefore, it can't really respond the transport need of each phase place, also just can not make the total delay minimum of vehicle, and induction control is often for single intersection.
3, regional coordination control
The historical car flow information at comprehensive each crossing of Surveillance center, utilize advanced algorithm that this cycle real-time traffic stream information is analyzed, predict the wagon flow situation of next signal period and generate corresponding optimum control scheme, can realize that each regional center (RC) of city always monitors the coordination control dual mode of center to the entire city traffic flow to the coordination control of traffic flow and city.
1. each regional center (RC) of city is to the coordination control of traffic flow
Be applied in the lower situation of urban traffic flow saturation degree, the access connection traffic flow detection system is uploaded to subregion Surveillance center with detected car flow information by signal controlling machine, control, compartment between each subregion are coordinated to this regional traffic flow voluntarily according to the real-time traffic stream information by subregion Surveillance center.
2. the coordination of entire city traffic flow control
Be applied in urban traffic flow saturation degree condition with higher, the access connection traffic flow detection system is uploaded to each subregion Surveillance center with detected car flow information by signal controlling machine, total monitoring center is mail to car flow information in each subregion Surveillance center, the special traffic control software (network operating system) of total monitoring center operation, the historical car flow information at comprehensive each crossing, utilize advanced algorithm that this cycle real-time traffic stream information is analyzed, predict the wagon flow situation of next signal period and generate corresponding optimum control scheme, realize the regional coordination control of entire city traffic flow.
The operating platform that system always monitors the center can show the traffic parameter that gather at each crossing in real time, upload download signal controller controlling schemes, assign steering order, realize multiple traffic control functions such as traffic hub coordination control, multi-period control, induction control, yellow sudden strain of a muscle, traffic control.The computer monitoring platform mainly is made up of control setting district, crossing constitutional diagram, crossing feature and four parts of current phase state.
1. the control setting district mainly monitors three parts by teleseme setting, network settings and teleseme and forms.
I, teleseme are provided with mainly and comprise:
Phase place, timing setting: mainly finish in the one-period, light on and off scheme red, green light is provided with, and definition red in each phase place, yellow, green light light on and off duration.
The period scheme is provided with: mainly finish the distribution condition setting to the different timings of each day day part.Promptly be provided with and carry out which kind of timing every day.
Mode of operation is selected: finish the control model selection of (comprising a series of patterns such as fixed cycle, multi-period leggy, half/full induction control, regional coordination control, command centre's stepping control), make teleseme carry out work by the mode of operation of selecting.
Traffic control: finish in particular cases the setting of each crossing passage situation.
II, network settings: be used to finish the basic parameter setting of system's ethernet communication.
III, signal controlling machine monitoring: finish the real-time monitoring to the next signal controlling machine and each belisha beacon running status, the trouble spot is judged and is handled suggestion, thereby the generation of minimizing accident improves the crossing communication efficiency.
2. crossing constitutional diagram: simulate each actual intersection feature, and show the wagon flow and the traffic signals light color of each intersection in real time.
3. crossing feature: the shows signal controller is to the current programme information of access connection traffic flow control in real time.
4. current phase state: the excess time that shows crossing light color timing in real time.
Host computer adopts database to deposit the traffic flow data of collection in worksite, available data is analyzed and is predicted the magnitude of traffic flow that obtains each crossing of next signal cycle by the intelligence computation method, automatically generate optimum controlling schemes, thereby realize the traffic zone coordinated management and the control of entire city.
Therefore, the intelligent traffic signal control system is used ethernet technology in conjunction with optical fiber, and variation that can each access connection traffic flow of real-time response is implemented regional coordination control to each access connection traffic flow of city.
Hereinbefore, though describe the present invention in detail with reference to specific embodiments of the invention,, clearly, in scope and spirit of the present invention, those skilled in the art can make amendment, change and improve embodiment.Therefore, will understand the present invention and be not limited to specific description embodiment, and only be limited by the scope of accessory claim.
Claims (12)
1, a kind of intelligent traffic control system comprises:
Traffic signal controlling machine can be coordinated intelligent algorithm by routine timing scheme, crossing detection data fusion or regional center effective light color scheme is provided, to realize the effective control to crossing left-hand rotation, craspedodrome, right-hand rotation and walkway light color;
The belisha beacon group, it shows the crossing light color on left-hand rotation, craspedodrome, right-hand rotation and the walkway of control in real time;
The ethernet communication system, it realizes the networking of signal controlling machine and regional center computing machine, to finish intelligent traffic control system remote data capture and transmission;
Computer monitoring center, the transport information that its received signal controller transmits shows related data by the background intelligent algorithm process, and signal controlling machine is carried out Long-distance Control.
2, intelligent traffic control system according to claim 1, wherein said signal controlling machine by microprocessor, colored lights driving, man-machine interface, vehicle detection, fault test oneself, the ether communication interface part is grouped into.
3, intelligent traffic control system according to claim 1, its ether communication interface of wherein said ethernet communication system mainly is made up of ethernet controller ENC28J60, network interface 0810-1X1T-06-F.
4, intelligent traffic control system according to claim 1, it is made up of wherein said computer monitoring center crossing feature, current phase state, crossing constitutional diagram and control, setting area.
5, intelligent traffic control system according to claim 2, wherein said signal controlling machine is characterised in that, the magnitude of traffic flow detects by near the checkout equipment that is installed in the crossing and finishes, checkout equipment utilization ground magnetic coil or ultrasound examination sensor come the inspection vehicle flow, then data are passed to signal controlling machine, signal controlling machine can generate the timing signal of following one-period automatically through fuzzy logic processes; Detect data and can pass to commander Surveillance center by Ethernet simultaneously, finish regional coordination control by central computer, and the regional coordination control timing signal that generates is issued to each teleseme, control of unit fuzzy self-adaption and regional coordination control mode can be provided with by the user, and any time can only be selected a kind of control mode work.
6, intelligent traffic control system according to claim 2, wherein said microprocessor adopts the single-chip microcomputer PIC18F8722 of U.S. Microchip, described PIC18F8722 adopts Harvard's bus structure, instruction is carried out and is realized " line production ", and low in energy consumption, strong interference immunity, be suitable for Industry Control, frequency of operation is 25MHz, and the FLASH program storage is 128K, is fit to very much be used for handling complicated ICP/IP protocol.
7, intelligent traffic control system according to claim 2, wherein said signal controlling machine are characterised in that to have green collision detection module and green inconsistent detection module.
8, intelligent traffic control system according to claim 7, wherein said green collision detection module is characterised in that, as obtain green conflict or green inconsistent signal, and then giving PIC18F8722 on the one hand, the signal controlling machine system lights corresponding signal pilot lamp on the control panel through handling; Give CPLDEPM7128STC100-10 on the other hand, cut off all light color outputs, and start yellow lightning road.
9, intelligent traffic control system according to claim 4, wherein said computer monitoring center realize that command centre's collection shows the traffic parameter at crossing, assign a plurality of traffic control parameters, comprising:
Traffic hub is coordinated control, multi-period control, induction adaptive control, yellow sudden strain of a muscle, traffic control.
10, intelligent traffic control system according to claim 4, wherein said crossing characteristic module can reflect a plurality of parameters at crossing, comprising:
Work at present pattern, total number of phases, current phase item, current period scheme number, current timing scheme number, current period and crossing signal controlling machine time.
11, intelligent traffic control system according to claim 4, wherein said control, setting area, it is made up of signal controlling machine setting, network settings and signal controlling machine monitoring part; Mainly the function that realizes phase place timing, period scheme setting, mode of operation selection, time, phase differential, yellow flash down phase control and traffic control during signal controlling machine is provided with; At the network settings page or leaf, the user can see the Ethernet information state, comprises client end/server end host name, host address, purpose, port information; Whether damaged condition, signal controlling machine and each the crossing equipment that signal controlling machine monitoring part is mainly obtained the crossing lamp by the various information of signal controlling machine feedback operate as normal.
12, intelligent traffic control system according to claim 5, its host computer incorporates intelligent optimization algorithm, can generate optimum timing scheme automatically according to historical data and real-time traffic stream information, comprising:
Step (1), signal controlling machine will be gathered traffic flow data in real time by the crossing vehicle detecting sensor, and give central computer by the Ethernet Optical Fiber Transmission;
Step (2), central computer adopt the intelligence computation method to handle each crossing traffic flow data, and adopt intelligent optimization method to determine the timing controlling schemes according to integrated performance index, realize the optimization of each crossing cycle and split;
Step (3) utilizes the phase differential optimization of crucial phase place to realize Region control optimization in the regional coordination control;
Each crossing timing signal and phase data after step (4), central computer will be optimized by the Ethernet Optical Fiber Transmission are issued to corresponding signal controlling machine.
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2007
- 2007-10-19 CN CNB2007101650026A patent/CN100511323C/en not_active Expired - Fee Related
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| CN102831770A (en) * | 2012-08-30 | 2012-12-19 | 西北工业大学 | Papasgeorgiou-E macroscopic traffic flow model-based FPGA (Field Programmable Gate Array) online predicting control method |
| CN102842228A (en) * | 2012-08-30 | 2012-12-26 | 西北工业大学 | FPGA (Field Programmable Gate Array) online predication control method based on macroscopic traffic flow model formulated by Wu Zheng |
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| CN101169903A (en) | 2008-04-30 |
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