CN102800201A - Control method and system for intersection signal timing guaranteeing priority of buses - Google Patents
Control method and system for intersection signal timing guaranteeing priority of buses Download PDFInfo
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- CN102800201A CN102800201A CN2012102901408A CN201210290140A CN102800201A CN 102800201 A CN102800201 A CN 102800201A CN 2012102901408 A CN2012102901408 A CN 2012102901408A CN 201210290140 A CN201210290140 A CN 201210290140A CN 102800201 A CN102800201 A CN 102800201A
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Abstract
The invention relates to a control method and a system for intersection signal timing guaranteeing the priority of buses. The system adopts an ultrahigh frequency RFID (Radio Frequency Identification) technique to achieve the remote recognition, acquisition and control of information of an onboard unit; and adjusting an intersection signal timing scheme through an optimization algorithm by collecting the information of buses in all direction of an intersection, so as to provide control of passing priority for buses. The control method solves the bus priority mode on common urban roads, and realizes the bus passing priority on the basis of maximizing the overall operation efficiency of vehicles at the intersection, so as to improve the operation efficiency of buses. In addition, the control method is low in cost and convenient to implement and becomes effective fast, and achieves the win-win of the bus priority and the overall operation efficiency of the intersection, so as to reduce delays of buses at urban intersections and ensure the punctuality of buses.
Description
Technical field
The present invention relates to public transport priority passing method and equipment, specifically is a kind of intersection signal timing control method and system that guarantees priorities of buses.
Background technology
" public traffic in priority " is public transport priority; Be meant in urban development and planning; Be placed on the construction of public transport, management on the preferential position; Give the support of aspects such as policy, fund, technology, make it can be, for public's trip provides more many, better, serve faster with unimpeded road, good vehicle condition, intensive gauze website in length and breadth.Public traffic in priority is exactly that the common people are preferential, and development public transport develops the people's livelihood exactly.The national conditions densely populated from China, that land used is in short supply are first developed the main developing direction that the most effective public transport of passenger traffic is China's urban passenger traffic, are the basic strategies that solves urban transport problems.Public traffic in priority is meant that the urban passenger traffic is main with the public transit system of high capacity, fast speed, and other vehicles are auxilliary, and it is the crowd that shunts fast, makes things convenient for citizens' activities, alleviates road pressure, alleviates the optimal path of urban traffic congestion.
At present; City fast public traffic system (BRT) is as a kind of novel public transport mode that improves the public transport service level; It is to utilize modernized public transport technology to cooperate intelligent transportation and operation management; Open up the public transportation lane road and build new-type bus stop, realize the rail transportation operation service, reach the urban transit system of a kind of uniqueness of light rail excellent service standard." space is preferential, and " pattern will be opened up dedicated bus lanes to this kind public traffic in priority type genus, on the ordinary road of small and medium-sized cities, realizes not too easily, has certain difficulty, is not suitable for the public traffic in priority on the ordinary road of city.China has all opened up public transportation lane in a lot of big cities, has obtained comparatively significant effect really at the part public bus network, but unsatisfactory for the public transit system effect of entire city.Trace it to its cause except lacking system's effective public special lane planning, most importantly public transit vehicle can't priority pass in the intersection.Public transit vehicle is incured loss through delay much larger than the highway section in the delay of intersection, does not therefore implement the intersection public traffic in priority, just is difficult to realize the public traffic in priority of real meaning.
Public traffic in priority has dual mode, the preferential and time priority in space.So-called space preferentially is meant sets up dedicated bus lanes; So-called time priority then is embodied in the priority pass of crossing public transit vehicle, for bus provides the priority pass signal.The preferential cost in space is high, have high input, and is difficult for implementing in small and medium-sized cities, so time priority is the research direction in present domestic public traffic in priority field.
Summary of the invention
The objective of the invention is for overcoming the deficiency of prior art, and a kind of intersection signal timing control method and system that guarantees priorities of buses is provided, this system has not only solved the public traffic in priority pattern of city ordinary road; Guaranteeing on the most effective basis of crossing gross vehicle running body, realizing the priority pass of public transit vehicle, improving the operational efficiency of public transit vehicle; And it is simple in structure; Construction cost is low, and it is convenient to realize, instant effect.
The intersection signal timing control method that guarantees priorities of buses of the present invention is based on ultra-high frequency RFID technology, through the adjustment signaling plan; The control method of right-of-way is provided for bus; Its technical scheme that adopts is: ultra-high frequency RFID technology is combined with traffic signal control system, let the bus priority pass, give full play to the effect of bus; Improve public transport operation efficient in the zone, reach the COMPREHENSIVE OPTIMAL effect of public transit vehicle and public vehicles.This method comprises the steps:
(1) the intersection signal timing dial control system of a public traffic in priority is set; This system comprises the remote public transit vehicle recognition device of being made up of ultrahigh frequency radio frequency identification (RFID) reader, antenna, vehicle electronics label, public traffic in priority controller and crossing signal controlling machine and the traffic lights be made up of signal processing module, triggering and micro-control output module, interface module, display module, power module, phase place indicating module;
(2) ultrahigh frequency radio frequency identification (RFID) reader and antenna are installed in 50-100 rice before the traffic lights of crossing all directions; The vehicle electronics label is installed on bus; Equipped public traffic in priority controller in the signal controlling machine of crossing; When bus during near the crossing, be installed in the ultrahigh frequency radio frequency identification (RFID) reader that the vehicle electronics label on the bus is installed on the road and discern at a distance, ultrahigh frequency radio frequency identification (RFID) reader transfers to the public traffic in priority controller with the label information of vehicle electronics label;
(3) the public traffic in priority controller carries out the relevant data processing after obtaining the vehicle electronics label information; And judge the vehicle phase information of this vehicle electronics label according to computing; Public traffic in priority timing control method to different is made corresponding processing and control, sends the signal controlling machine action of command signal control crossing;
(4) each phase place traffic lights of adjustment crossing working time, can realize the timing control of public traffic in priority.
The said public traffic in priority controller of step (3), realize the intersection signal timing control of public traffic in priority through following steps:
1) after the public traffic in priority controller obtains the vehicle electronics label information, carry out providing the public traffic in priority phase information than sentencing reason with vehicle electronics label binding information in the public traffic in priority controller database:
Carry out phase information analysis and the analysis of public transit vehicle running route according to the actual conditions at the crossing that the public traffic in priority control system is installed in advance; The vehicle electronics label is before being installed to public transit vehicle; Bind with phase information, license plate number, the public bus network of public transit vehicle; Vehicle electronics label information and crossing phase information are loaded in the public traffic in priority controller database after binding;
After the public traffic in priority controller obtains the vehicle electronics label information; Carry out than declaring computing with the label information in the database; Provide the public traffic in priority phase information through calculating, the public traffic in priority phase information transfers to the C51 processor in the signal processing module through the ARM7 processor in the signal processing module;
2) the C51 processor in the signal processing module is according to carrying out public traffic in priority phase information and current operation phase information, working time etc. priority algorithm;
C51 processor in the signal processing module is responsible for carrying out public traffic in priority algorithm and the various operation of deciding the timing scheme; Before operation; At first to load intersection signal and decide the timing scheme in the C51 processor; Decide the timing scheme and comprise crossing phase configuration information: the setting of phase configuration quantity, transit time, the green time setting of each phase place (normal transit time, minimum transit time, maximum transit time, public traffic in priority expansion time) etc.;
The public traffic in priority phase information that C51 processor in the signal processing module transmits according to the ARM7 processor in the signal processing module in conjunction with current operation phase information, working time etc. carrying out preferential control algolithm, provides the priority algorithm result.
Said preferential control algolithm comprises:
(1) basic controlling rule:
If A. the public transport phase place is a green light:
If a) phase place green light enough buses excess time then do not change signal timing dial through the crossing;
B) if the phase place green light is not enough to make that bus passes through the crossing excess time:
If i. in green extension of regulation in the scope, bus can pass through the crossing, then prolongs the phase place green time;
If ii is in green extension of regulation in the scope, bus can not pass through the crossing, then keeps this phase place green light duration constant, and subsequent phase is carried out minimum green time, makes the green light phase place return the public transport phase place as early as possible;
If B. the public transport phase place is a red light:
If a) current green light phase place has surpassed minimum green time working time, switch the green light phase place immediately, subsequent phase is carried out minimum green time, makes the green light phase place return the public transport phase place as early as possible;
B) if current green light phase place does not reach minimum green time working time, then keep the green light phase place to carry out the phase place switching again up to reaching minimum green time, subsequent phase is carried out minimum green time, makes the green light phase place return the public transport phase place as early as possible;
(2) leggy arrives control law simultaneously:
When a plurality of phase places have public transit vehicle to arrive simultaneously:
A. preferential the current of current green light phase place public transit vehicle that guarantee;
B. other phase places are added up the public transit vehicle quantity that waits respectively, select the maximum phase place of public transit vehicle quantity as preferential phase place;
C. subsequent phase is carried out minimum green time, makes green light arrive preferential phase place as early as possible;
(3) the minimum green time g of phase place
IminConfirm:
The minimum green time g of phase place
IminConfirm that will guarantee that promptly the pedestrian can cross the street safely, computing formula is according to the pedestrian's street crossing time:
In the formula, l
pBe the crossing effective length, unit rice (m); v
pBe pedestrian's street crossing speed, the m/s of unit; I is the green light interval time of crossing, unit second (s).
(4) the maximum green extension g of public transport phase place
MaxConfirm:
The maximum green extension g of public transport phase place
MaxBe the maximum green time G of public transport phase place
LmaxWith original allocation green time G
LsPoor, i.e. g
Max=G
Lmax-G
Ls, wherein maximum green time is confirmed according to the crossing concrete condition.
3) the public traffic in priority controller provides each phase place traffic lights control signal working time according to preferential control algolithm result, and signal transfers to the crossing signal controlling machine, adjusts each phase place traffic lights working time, realizes that public traffic in priority is current:
C51 processor in the signal processing module is according to the priority algorithm result; Provide each phase place traffic lights control signal working time; The break-make of each phase relay in control triggering and the micro-control output module, relay output signal transfers to the crossing signal controlling machine, the switching of each phase signal lamp of control crossing; Thereby adjust each phase place traffic lights working time, realize public traffic in priority.If there is not public transport priority signal, then the C51 processor in the signal processing module is carried out normal timing scheme, and traffic lights move by the normal transit time of setting working time.
Traffic lights working times, the time was calculated gained by 51 processors of the C in the signal processing module to calculate second.The crystal oscillator of C51 processor adopting 11.0592MHz, crystal oscillator have adopted the temp. compensation type oscillator of high stability, have guaranteed accuracy, the stability of time.
The present invention has realized public transit vehicle preferentially through the crossing through on probation enforcement the in the Nanning City, thereby the reduction bus improves the travelling speed of bus through the working time of urban intersection.Facts have proved; The construction of public traffic in priority system; Reached for public transit vehicle provides more unimpeded a, running environment more efficiently, for bus passenger provide one safer, more fast, more convenient, the more comfortable target of environment by bus, have important social value and economic benefit.
The system that is used to realize the intersection signal timing control method of above-mentioned public traffic in priority is the traffic signal control system of public traffic in priority; It comprises crossing signal controlling machine and traffic lights; Different with prior art is: also be provided with remote public transit vehicle recognition device and public traffic in priority controller; The public traffic in priority controller is connected with the crossing signal controlling machine with the remote vehicle recognition device respectively, and the crossing signal controlling machine is directly controlled the phase place working time of traffic lights.
Described remote vehicle recognition device comprises ultrahigh frequency radio frequency identification (RFID) reader, the antenna that is arranged on the crossing and is arranged on the vehicle electronics label on the bus that ultrahigh frequency radio frequency identification (RFID) reader is connected with antenna, antenna and vehicle electronics label radio communication.
Described public traffic in priority controller comprises signal processing module, triggering and micro-control output module, interface module, phase place indicating module and power module; Signal processing module is connected with micro-control output module, phase place indicating module, interface module, display module with triggering respectively; Triggering is connected with signal controlling machine with the micro-control output module, and interface module is connected with the remote vehicle recognition device.Wherein:
Said signal processing module, be used to accomplish the bus data message the reception storage, data message is carried out public traffic in priority calculation process and comparison, send work such as control command signal.
Trigger and the micro-control output module; Be used to carry out the result and the steering order of signal processing module, the make-and-break time of pilot relay drives the relay mouthful signal controller that satisfies the need and sends steering order; Control belisha beacon phase place working time with this, the phase place of accomplishing signal lamp is switched.
Interface module is used to accomplish with the data communication of crossing read write line with outer PC and carries out exchanges data, transmits by the vehicle electronics label information of ultrahigh frequency radio frequency identification (RFID) reader demodulation sign indicating number to signal processing module simultaneously.
Display module is used for showing in real time current demand signal controller operation phase place, phase place working time, excess time, preferential time of phase place and the information such as bus quantity that wait in each phase place.
Power module is used for power supply with the DC12V of outside and converts DC5V, DC3.3V power supply each module for power supply to the public traffic in priority controller into.
The phase place indicating module is used for the signal controlling machine phase place running status indication of current crossing.
In the work; By the radiofrequency signal of the ultrahigh frequency radio frequency identification (RFID) reader that is installed in the crossing all directions through the antenna transmission certain frequency; When the vehicle electronics label gets into the antenna perform region, produce induction current, the vehicle electronics label obtains energy and is activated, and the vehicle electronics label sends information such as self coding through blocking built-in transmitting antenna; Antenna receives the carrier signal of sending from the vehicle electronics label; Antenna adjustments device through it is sent to read write line, and read write line carries out the demodulation sign indicating number to the received signal, is sent to the information processing that the public traffic in priority controller is correlated with then; The public traffic in priority controller is judged the vehicle phase information of this label according to the computing of public traffic in priority algorithm logic; Make the processing and the control of public traffic in priority to bus in the different situations at crossing, and send the signal controlling machine action of command signal control crossing, make it to adjust each phase place traffic lights working time.
Advantage of the present invention is:
(1) the present invention is melted into a whole advanced ultra-high frequency RFID technology, data communication technology, electron controls technology and Computer Processing technology etc. effectively; Be used in the middle of the urban traffic control system; On the working foundation of controller for urban single intersection machine; Realize public transit vehicle preferentially through the crossing, thereby the reduction bus improves the travelling speed of bus through the working time of urban intersection;
(2) the present invention is a kind of public transport priority signal timing control method and system based on " time priority "; It has solved the public traffic in priority pattern of city ordinary road; Can on the ordinary road of city, realize public traffic in priority, construction cost is low, and it is convenient to realize; Instant effect does not need investment construction dedicated bus lanes energetically.It has realized the doulbe-sides' victory of public traffic in priority and crossing overall operation efficiency, incurs loss through delay in the operation of urban intersection thereby reduce public transit vehicle, guarantees the punctuality of public transit vehicle operation, can realize truly that public traffic in priority is current;
(3) adopt the RFID technology to obtain the vehicle operating direction, have more superiority, uniqueness, improved the traffic efficiency of the various vehicles in crossing than coil detection, image recognition, GPS etc.;
(4) realized merging design with the integral body of crossing, crossing signal controlling machine.
Description of drawings
Fig. 1 is a traffic signal control system structural representation of the present invention.
Fig. 2 is a public traffic in priority controller architecture synoptic diagram of the present invention.
Fig. 3 is the workflow diagram of an embodiment of a kind of intersection signal timing control method that guarantees priorities of buses of the present invention.
Fig. 4 is the workflow diagram that leggy all has an embodiment when detecting bus arrival.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done further elaboration.
With reference to Fig. 1, traffic signal control system of the present invention mainly comprises ultrahigh frequency radio frequency identification (RFID) reader 102, antenna 103, vehicle electronics label 105, public traffic in priority controller 101, crossing signal controlling machine 104 and traffic lights 106.Public traffic in priority controller 101 usefulness data transmission interfaces are connected with crossing signal controlling machine 104 with ultrahigh frequency radio frequency identification (RFID) reader 102 respectively; Read write line 102 is connected with antenna 103; Antenna 103 be installed in vehicle electronics label 105 radio communications on the bus, signal controlling machine 104 is directly controlled the phase place working time of traffic lights 106.
Described ultrahigh frequency radio frequency identification (RFID) reader 102, antenna 103, vehicle electronics label 105 are front end data acquisition parts of system and device; The data acquisition of the intersection signal timing control method that completion guarantees priorities of buses, wherein: ultrahigh frequency radio frequency identification (RFID) reader 102 mainly is made up of control module, transmitter module, receiver module, baseband processing module, the controlled module controls of transmitter module; For read write line provides carrier signal; And to carrier signal modulate with power amplification after, the radio frequency interface output through transmitter module transmits to electronic tag, simultaneously; Radio frequency interface receives the reflected signal that electronic tag returns, and is input to receiver module; Receiver module carries out the zero intermediate frequency demodulation with the reflected signal that electronic tag returns, and realizes the two-way quadrature decoder, output two-way baseband signal; Baseband processing module carries out filtering, amplification, shaping to the two-way baseband signal, the accessible low frequency signal of controlled module; Control module receives and handles two-way quadrature low frequency signal simultaneously, signal is reverted to the raw information of electronic tag.Read write line has adopted the anti-collision algorithms based on the binary tree, has improved the ability of system anticonflict, has solved the problem that reads of the many labels of read write line.
As shown in Figure 2; Described public traffic in priority controller 101; Comprise signal processing module 201, triggering and micro-control output module 202, interface module 203, display module 204, power module 205 and phase place indicating module 206; Be the core processing part of system, accomplish the intersection signal timing control method guarantee priorities of buses signal Processing, public traffic in priority control method, output control signal, decide function such as timing.Wherein:
In the present invention, ARM7 processor 2011 is used for the collection of vehicle electronics label information, storage cart live subtab information, crossing phase information in advance, and crossing bus number is discerned statistics and public traffic in priority bit arithmetic etc. mutually.
Each crossing phase information, vehicle electronics label information are in advance through being provided with in the FLASH database that software writes ARM7 processor 2011; Phase information and label information, read write line address information are carried out and are bound; Data write through the RS232 interface in the interface module 203 and communicate by letter with PC; A serial ports of RS232 interface and the shared ARM7 processor 2011 of RS485 interface is selected through SS.
In signal processing module, the serial interface communication mode of interrupt mode is adopted in the data communication of RAM7 processor 2011 and C51 processor 2012, in order to the real-time of guarantee information transmission.
According to public traffic in priority algorithm operation result; Send the phase place trigger pip; Control triggers and the make-and-break time of each phase relay of micro-control output module, and then adjusts each phase place traffic lights working time, and traffic lights working times is calculated by the timer of C51 processor.
When carrying out the computing of public traffic in priority algorithm, C51 processor 2012 needs the various data messages of deciding timing in relevant crossing; It comprises that phase configuration quantity, transit time are provided with; The green time setting of each phase place (comprising normal transit time, minimum transit time, maximum transit time, public traffic in priority expansion time) etc.; These information all write among the FLASH of C51 processor in advance, and the software that is provided with that data write by PC carries out.
Various data of deciding the timing scheme write the RS232 interface that uses in the interface module 203 and communicate by letter with PC; The RS232 interface is connected to the serial ports of ARM7 processor 2011 through level conversion; The data that write are cached in earlier in the ARM7 processor 2011, are forwarded to C51 processor 2012 through program command again.
Said triggering and micro-control output module 202; Mainly form by relay and phase place switch driving circuit; This module 202 is used to carry out the result and the steering order of signal processing module 201, and the make-and-break time of pilot relay drives the relay mouthful signal controller that satisfies the need and sends steering order; Control belisha beacon phase place working time with this, the phase place of accomplishing signal lamp is switched; Wherein,
The phase place switch driving circuit uses the PNP triode to be connected with the I/O mouth of C51 processor 2012, adopts and irritates current-mode, to solve the less situation of C51 processor I/O mouth drive current; Relay adopts drive current little, has the solid-state relay of the contactless electronic beam switch of isolation features, in order to realize the isolation of public traffic in priority controller control end and crossing signal controlling machine load end.
The triggering of public traffic in priority controller of the present invention and micro-control output module 202 have the output mode of triggering and two kinds of public traffic in priority output schemes of micro-control output mode, correspond respectively to the priority scheme of binding signal controller and can select autonomous priority scheme; When selecting autonomous priority scheme; Triggering and micro-control output module are chosen as the micro-control output mode; This moment, the public traffic in priority controller replaced the timing function of signal controlling machine basically; Adjustment working time of each phase place is carried out the computing of public traffic in priority algorithm through signal processing module and is realized that signal controlling machine only carries out the driving of signal lamp.Carry out public traffic in priority, just adjust phase place working time, do not need preferentially under the conventional state, then move basic timing pattern, and therefore the phase sequence recurrent state does not change according to arithmetic result; When selecting the priority scheme of binding signal controller; The defeated module of triggering and micro-control then adopts the triggering output mode; The public traffic in priority controller is only according to detected bus number; Count each phase place and arrive the bus quantity at crossing, and only export the public transit vehicle information of each phase place of crossing, the public traffic in priority phase place is carried out calculation optimization and adjustment phase place working time by signal controlling machine.
Said interface module 203; Mainly form by RS485 interface chip, RS232 interface chip and interface lightning protection circuit 2031 and interface selection etc.; This module is used to accomplish with the data communication of crossing read write line with outer PC carries out exchanges data, transmits by the vehicle electronics label information of ultrahigh frequency radio frequency identification (RFID) reader 102 demodulation sign indicating numbers to signal processing module 201 simultaneously.
The RS485 interface chip is used for carrying out data communication with outside ultrahigh frequency radio frequency identification (RFID) reader; Employing has the difference transceiver SN75LBC184 of transient voltage inhibit feature; Built-in chip type has high-energy transition noise protective device; Can be in order to improve the reliability of the transition noise on the anti-data cable, this interface chip provides reliable and low-cost direct-connected data line interface for being connected with read write line.
The RS232 interface chip uses SP3232EB series RS-232 transceiving device; Be used for carrying out exchanges data with outer PC; This chip charge pump power supply only needs 0.1 μ F capacitor under 3.3V voltage, to operate, function that the driver that this charge pump has a device under the low-power consumption shutdown mode is exported and charge pump is under an embargo.
The RS232 interface also is used for the public transport priority signal controller is carried out the parameter setting in advance; Parameter is provided with and mainly comprises crossing phase configuration information and vehicle electronics tag configurations information; Wherein phase configuration information in crossing also comprises: the setting of phase configuration quantity, transit time; The green time setting of each phase place (comprising normal transit time, minimum transit time, maximum transit time, public traffic in priority expansion time); Card reader phase configuration etc., vehicle electronics tag configurations information comprise the corresponding phase place of label ID number, label, public bus network, public transport car plate etc., but label individual or the database of write signal processing module in batches.
The employing RS485 interface owing to communicate by letter between public traffic in priority controller and the ultrahigh frequency radio frequency identification (RFID) reader; And the network topology of RS-485 interface adopts the bus type structure of terminal coupling; This structure is connected in series each node with a bus; Be in outdoor ultrahigh frequency radio frequency identification (RFID) reader and disturb a plurality of RS-485 transceiving devices that often can cause on the transmission line to damage by the transition of thunder and lightning initiation, so the lightning Protection Design of interface module is particularly important at thunderstorm season.For this reason
The present invention is provided with lightning protection circuit 2031 at the RS-485 of interface module 203 interface; This circuit adopts primary and secondary two-stage lightning protection circuit structure; And have by PTC and insure the current-limiting protection circuit that constitutes, can realize anti-thunderbolt of the integral body of RS-485 interface and overvoltage protection from recovery.
The Chinese fonts lcd module of display module 204 use band touch functions, this module possess operating functions such as the whole screen in upper and lower, left and right moves demonstration and whole screen is removed, cursor shows, anti-white.
Display module is used for showing in real time current demand signal controller operation phase place, phase place working time, excess time, preferential time of phase place and the information such as bus quantity that wait in each phase place.
Phase place indicating module 206 is used for the indication of current demand signal controller phase place running status; It is made up of light emitting diode and phase place indication driving circuit; Wherein be used for the micro-control output mode indication of 4 road phase states is arranged; What be used to trigger output mode has an indication of 4 road phase states, and phase place indicating module 206 is connected with C51 processor 2012 usefulness I/O interfaces, indicates C51 processor 2012 to carry out the public traffic in priority phase signal that the computing of public traffic in priority algorithm draws by light emitting diode.
According to shown in Figure 2; The phase state indication of phase place indicating module 206 is consistent with the signal lamp phase state that triggering and micro-control output module 202 output to signal controlling machine 104, and promptly when triggering and micro-control when being output as phase place 1, phase place indicating module the 1 road diode is lighted; When triggering and micro-control output phase when switching to phase place 2; Then phase place indicating module the 1 road diode extinguishes, and the 2 road diode is lighted, and circular flow according to this.
Said crossing signal controlling machine 104 is a prior art, is the operation part in the native system, functions such as the driving of completion intersection signal lamp, timing control, operational mode selection, and realization and public traffic in priority controller is synchronous.
The crossing signal controlling machine receives the steering order of public traffic in priority controller; Drive the intersection signal lamp; Realize the switching of intersection signal lamp working time and the synchronous switching of realization and public traffic in priority controller steering order, thus the intersection signal timing control method that realization guarantees priorities of buses.
Native system adopts ultra-high frequency RFID technology, realizes identification, collection and the control of remote vehicle electronics label 105 information.The radiofrequency signal that ultrahigh frequency radio frequency identification (RFID) reader 102 sends certain frequency through antenna 103 sends vehicle electronics label 105 information when vehicle electronics label 105 gets into antenna 103 perform regions through the label built-in aerial; Antenna receives the carrier signal of sending from the vehicle electronics label; Be sent to ultrahigh frequency radio frequency identification (RFID) reader 102 through antenna 103; Ultrahigh frequency radio frequency identification (RFID) reader 102 carries out the demodulation sign indicating number to the received signal, delivers to public traffic in priority controller 101 then and carries out relevant treatment; Public traffic in priority controller 101 is judged the vehicle phase information of this vehicle electronics label 105 according to computing; Public traffic in priority timing control method to different is made corresponding processing and control; Send signal controlling machine 104 actions of command signal control crossing; Each phase place traffic lights of adjustment crossing working times, realize the intersection signal timing control method that guarantees priorities of buses.Its concrete workflow is:
1) the public traffic in priority controller sends reading of data instruction (instruction is sent by address cycle) to the ultrahigh frequency radio frequency identification (RFID) reader that is installed in the crossing all directions; When each ultrahigh frequency radio frequency identification (RFID) reader of crossing receives instruction; Carry out relevant treatment; As instruct the address of transmission identical with this ultrahigh frequency radio frequency identification (RFID) reader address; Then the ultrahigh frequency radio frequency identification (RFID) reader response instruction when ultrahigh frequency radio frequency identification (RFID) reader has detected bus arrival crossroad, transfers to the public traffic in priority controller to the bus label information that reads;
2) signal processing module of public traffic in priority controller (ARM7 processor) is according to the label information that receives; Carry out than declare with the label information of database in the ARM7 processor; Confirm the phase information of the label information of reception, send to phase information the C51 processor of signal processing module again;
3) signal processing module of public traffic in priority controller (C51 processor) carries out public traffic in priority control computing according to the phase information that receives, and realizes the intersection signal timing control method that guarantees priorities of buses.Specifically be when having detected bus arrival crossroad, carry out various priority algorithms, shorten the red light stand-by period as far as possible, prolong the green light transit time, improve the bus traffic efficiency according to current phase place;
Do you when public transit vehicle arrives, judge that this phase place is a green time?
If be green time, then calculate vehicle and can pass through the crossing, if can pass through the crossing; Then public traffic in priority is left intact, if can not pass through the crossing, then according to algorithm administered over prolonged green time; Promptly give public traffic in priority; If extend to the largest extension time, then green light is carried out maximum transit time, otherwise passes through smoothly;
If be red time, red light is waited for, the excess time of inquiry green light place phase place; If have plenty of time, reduce this phase place green time, judge whether next phase place is this phase place; If this phase place then passes through smoothly, otherwise reduce this phase place green light execution time; Carry out minimum transit time, till this phase place; If the excess time of place phase place is not abundant, this phase place green time of inoperation is directly judged next phase place, till this phase place.
4) triggering of public traffic in priority controller and micro-control output module are according to the operation result of signal processing module; The output control signal; Mouthful signal controller that satisfies the need sends steering order, in order to control belisha beacon phase place, accomplishes the switching of signal lamp; Realize the timing control of belisha beacon, thereby realize public traffic in priority.
Embodiment 1: a kind of workflow of the timing control method that guarantees priorities of buses
As shown in Figure 3, this workflow may further comprise the steps:
Step S301 has detected bus and has arrived, execution in step S302;
In this step; Can be through in road or at the other ultrahigh frequency radio frequency identification (RFID) reader of installing of road; And corresponding vehicle electronics label is installed on bus; Thereby realize the real-time detection that public transit vehicle arrives, promptly get into preferential control flow after detecting bus, the phase place that described bus arrives is the public traffic in priority phase place;
Step S302 judges whether current public transport phase place is green light, if execution in step S303 then, otherwise execution in step S310;
This step is the state of the current demand signal lamp of bus place phase place when judging the ultrahigh frequency radio frequency identification (RFID) reader of bus through the crossing;
Step S303 judges whether current public transport phase place green light is enough to make bus pass through the crossing excess time, if execution in step S304 then, otherwise execution in step S305;
In this step; Can through preset bus average overall travel speed and ultrahigh frequency radio frequency identification (RFID) reader to the distance of crossing estimate bus from ultrahigh frequency radio frequency identification (RFID) reader to passing through crossing required approximate time, compare excess time with public transport phase place green light then;
Step S304 does not change signal timing dial;
Can continue to detect bus after this step finishes and arrive, and then the flow process of public traffic in priority is carried out in circulation;
Step S305 judges whether enough buses were through the crossing after public transport phase place green time prolonged, if inadequately then execution in step S306, otherwise execution in step S304;
Step S306 prolongs the green time of current public transport phase place;
Step S307, whether the green time after judge prolonging meets or exceeds maximum green time, if execution in step S308 then, otherwise flow process finishes (S309), can continue to detect bus and arrive;
Step S308, the public transport phase place is switched phase place after carrying out maximum green time, no longer prolongs;
Step S310, the public transport phase place is a red light, bus gets into waiting status, execution in step S316;
Step S316 judges whether that a plurality of phase places all detect bus and arrive, if execution in step S317 then, otherwise execution in step S311;
In this step, arrive, then get into leggy and arrive control flow (referring to Fig. 4) simultaneously if a plurality of phase places all detect bus;
Step S311 inquires about executed time of current green light phase place, execution in step S312;
Step S312 judges that whether the executed time of current green light phase place surpassed minimum green time, if execution in step S318 then, otherwise execution in step S313;
Step S313 carries out minimum green time, then execution in step S314;
In this step, carrying out minimum green time, promptly is when the phase place green light executed time reaches minimum green time, switches phase place immediately;
Step S318 switches phase place immediately, then execution in step S314;
Step S314 judges whether the phase place after switching is the public transport phase place, is that then flow process finishes, otherwise execution in step S315;
In this step, if the phase place public transport phase place after the switching is explained bus P Passable, flow process finishes, and can continue to detect the arrival of follow-up bus;
Step S315 reduces the phase place green time, then execution in step S314;
This step purpose is to make the green light phase place switch to the public transport phase place as early as possible;
More than be exactly to detect the basic controlling flow process that bus arrives back this method.
Embodiment 2: a kind of leggy all has the workflow when detecting bus arrival
As shown in Figure 4, its workflow may further comprise the steps:
Step S401 judges whether current green light phase place has and prolongs request, if execution in step S402 then, otherwise execution in step S403;
In this step, no matter whether other phase places have bus to arrive, and must judge earlier all whether current green light phase place has bus need prolong green light through the crossing, and this is to pass through for the bus of preferentially guaranteeing current green light phase place;
Step S402 gets into green light and prolongs step, execution in step S403 afterwards;
Step S403 adds up the detected bus quantity of each red light phase place, afterwards execution in step S404;
In this step, the object of quantity statistics is after phase place switches to the red light phase place from last green light phase place, up to the current time during this period of time in, the bus that this phase-detection arrives;
Step S404, selecting the maximum phase place of bus quantity is preferential phase place, afterwards execution in step S405;
Step S405 inquires about executed time of current green light phase place, execution in step S406;
Step S406 judges that whether the executed time of current green light phase place surpassed minimum green time, if execution in step S407 then, otherwise execution in step S408;
Step S407 switches phase place immediately, then execution in step S409;
Step S408 carries out minimum green time, then execution in step S409;
Step S409, the phase place after judge switching whether be before selected preferential phase place, if then flow process finishes, otherwise execution in step S405;
In this step, if the preferential phase place of the phase place after the switching explains that the maximum phase place of bus quantity has obtained right-of-way, flow process finishes.
Claims (6)
1. an intersection signal timing control method that guarantees priorities of buses is characterized in that: comprise the steps:
(1) the intersection signal timing dial control system of a public traffic in priority is set; This system comprises the remote public transit vehicle recognition device of being made up of ultrahigh frequency radio frequency identification (RFID) reader, antenna, vehicle electronics label, public traffic in priority controller and crossing signal controlling machine and the traffic lights be made up of signal processing module, triggering and micro-control output module, interface module, display module, power module, phase place indicating module;
(2) ultrahigh frequency radio frequency identification (RFID) reader and antenna are installed in 50-100 rice before the traffic lights of crossing all directions; The vehicle electronics label is installed on bus; Equipped public traffic in priority controller in the signal controlling machine of crossing; When bus during near the crossing, be installed in the ultrahigh frequency radio frequency identification (RFID) reader that the vehicle electronics label on the bus is installed on the road and discern at a distance, ultrahigh frequency radio frequency identification (RFID) reader transfers to the public traffic in priority controller with the label information of public transit vehicle;
(3) the public traffic in priority controller carries out the relevant data processing after obtaining the vehicle electronics label information; This controller is judged the vehicle phase information of this vehicle electronics label according to computing; Public traffic in priority timing control method to different is made corresponding processing and control, sends the signal controlling machine action of command signal control crossing;
(4) each phase place traffic lights of adjustment crossing working time, can realize the timing control of public traffic in priority.
2. control method according to claim 1 is characterized in that: after described public traffic in priority controller obtains the vehicle electronics label information, realize the intersection signal timing dial control of public traffic in priority through following steps:
(1) after the public traffic in priority controller obtains the vehicle electronics label information, carry out providing the public traffic in priority phase information than sentencing reason with vehicle electronics label binding information in the public traffic in priority controller database:
Carry out phase information analysis and the analysis of public transit vehicle running route according to the actual conditions at the crossing that the public traffic in priority control system is installed in advance; The vehicle electronics label is before being installed to public transit vehicle; Bind with phase information, license plate number, the public bus network of public transit vehicle; Vehicle electronics label information and crossing phase information are loaded in the public traffic in priority controller database after binding;
After the public traffic in priority controller obtains the vehicle electronics label information; Carry out than declaring computing with the label information in the database; Provide the public traffic in priority phase information through calculating, the public traffic in priority phase information transfers to the C51 processor in the signal processing module through the ARM7 processor in the signal processing module;
(2) the C51 processor in the signal processing module is according to carrying out public traffic in priority phase information and current operation phase information, working time etc. priority algorithm:
C51 processor in the signal processing module is responsible for carrying out public traffic in priority algorithm and the various operation of deciding the timing scheme; Before operation; At first to load intersection signal and decide the timing scheme in the C51 processor; Decide the timing scheme and comprise crossing phase configuration information: the setting of phase configuration quantity, transit time, the green time setting of each phase place;
The public traffic in priority phase information that C51 processor in the signal processing module transmits according to the ARM7 processor in the signal processing module in conjunction with current operation phase information, working time etc. carrying out preferential control algolithm, provides the priority algorithm result;
(3) the public traffic in priority controller provides each phase place traffic lights control signal working time according to preferential control algolithm, and signal transfers to the crossing signal controlling machine, adjusts each phase place traffic lights working time, realizes that public traffic in priority is current.
3. control method according to claim 2 is characterized in that: said preferential control algolithm comprises:
(1) basic controlling rule:
If A. the public transport phase place is a green light:
If a) phase place green light enough buses excess time then do not change signal timing dial through the crossing;
B) if the phase place green light is not enough to make that bus passes through the crossing excess time:
If i. in green extension of regulation in the scope, bus can pass through the crossing, then prolongs the phase place green time;
If ii is in green extension of regulation in the scope, bus can not pass through the crossing, then keeps this phase place green light duration constant, and subsequent phase is carried out minimum green time, makes the green light phase place return the public transport phase place as early as possible;
If B. the public transport phase place is a red light:
If a) current green light phase place has surpassed minimum green time working time, switch the green light phase place immediately, subsequent phase is carried out minimum green time, makes the green light phase place return the public transport phase place as early as possible;
B) if current green light phase place does not reach minimum green time working time, then keep the green light phase place to carry out the phase place switching again up to reaching minimum green time, subsequent phase is carried out minimum green time, makes the green light phase place return the public transport phase place as early as possible;
(2) leggy arrives control law simultaneously:
When a plurality of phase places have public transit vehicle to arrive simultaneously:
A. preferential the current of current green light phase place public transit vehicle that guarantee;
B. other phase places are added up the public transit vehicle quantity that waits respectively, select the maximum phase place of public transit vehicle quantity as preferential phase place;
C. subsequent phase is carried out minimum green time, makes green light arrive preferential phase place as early as possible;
(3) the minimum green time g of phase place
IminConfirm:
The minimum green time g of phase place
IminConfirm that will guarantee that promptly the pedestrian can cross the street safely, computing formula is according to the pedestrian's street crossing time:
In the formula, l
pBe the crossing effective length, unit rice (m); v
pBe pedestrian's street crossing speed, the m/s of unit; I is the green light interval time of crossing, unit second (s);
(4) the maximum green extension g of public transport phase place
MaxConfirm:
The maximum green extension g of public transport phase place
MaxBe the maximum green time G of public transport phase place
LmaxWith original allocation green time G
LsPoor, i.e. g
Max=G
Lmax-G
Ls, wherein maximum green time is confirmed according to the crossing concrete condition.
4. be used to realize the traffic signal control system of one of claim 1-3 said control method; Comprise crossing signal controlling machine and traffic lights; It is characterized in that: also be provided with remote public transit vehicle recognition device and public traffic in priority controller; The public traffic in priority controller is connected with the crossing signal controlling machine with the remote vehicle recognition device respectively, and the crossing signal controlling machine is directly controlled the phase place working time of traffic lights.
5. system according to claim 4; It is characterized in that: described remote vehicle recognition device comprises ultrahigh frequency radio frequency identification (RFID) reader, the antenna that is arranged on the crossing and is arranged on the vehicle electronics label on the bus; Ultrahigh frequency radio frequency identification (RFID) reader is connected with antenna, antenna and vehicle electronics label radio communication.
6. system according to claim 4; It is characterized in that: described public traffic in priority controller comprises signal processing module, triggering and micro-control output module, interface module, phase place indicating module and power module; Signal processing module is connected with micro-control output module, phase place indicating module, interface module, display module with triggering respectively; Triggering is connected with signal controlling machine with the micro-control output module, and interface module is connected with the remote vehicle recognition device.
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| CN112967513A (en) * | 2021-03-30 | 2021-06-15 | 华录智达科技股份有限公司 | Bus rapid transit priority passing control system |
| CN113593272A (en) * | 2021-07-20 | 2021-11-02 | 青岛海信网络科技股份有限公司 | Vehicle priority passing method and signal machine |
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Application publication date: 20121128 |