CN105046989A - Crossroad traffic signal lamp time variable control system - Google Patents
Crossroad traffic signal lamp time variable control system Download PDFInfo
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Abstract
The invention relates to a crossroad traffic signal lamp time variable control system. According to the invention, laser correlation devices mounted at lane outlets of a crossroad are used to identify vehicles waiting for release at the lane outlets and calculate the number of vehicles which reach to a current crossroad after being released at a last crossroad, so that the traffic light timing plan is determined timely.
Description
(1) technical field:
The present invention relates to control system when crossroad access signal lamp becomes, it is by the laser-correlation device being loaded on each track, crossroad flow export, be identified in the vehicle that flow export place, track etc. is to be released, and calculate the vehicle number arriving this crossroad after letting pass in crossroad, front, determine traffic lights timing scheme in real time.
(2) background technology:
Along with the develop rapidly of China's economy, Urban vehicles poputation and the sustainable growth of traffic total amount, and corresponding road infrastructure construction is difficult to catch up with in time, therefore in urban road network, particularly grade crossing it be again the bottleneck of road passage capability.Special very crowded in commuter time traffic, vehicle is quite time-consuming by intersection, therefore improves the traffic capacity of grade crossing, and improving traffic intersection Traffic signal control ability is a urgent problem.
Outer measurement and the assessment mainly still taking foundation road traffic of Present Domestic, recycling Principle of Statistics carrys out optimization of road joints Traffic signal control.Vehicle flowrate measurement is the contactless traffic information collecting apparatus in a kind of road surface, is mainly divided into ripple detection frequently and the large class of video detection two.Ripple frequently detection can be divided into again microwave, ultrasound wave and infrared three kinds, adopts and receives vehicle reflection wave, add up the vehicle flowrate by surveyed area by the change of low and high level, therefore there is not the shortcomings such as installation and maintenance difficulty, serviceable life is short.The microwave vehicle detecting device such as adopted it can be arranged on trackside lamp stand on or on special column, when the radar wave region that vehicle is launched by microwave generating apparatus, vehicle is detected.
Also the embedded underground inductive coil adopted near all directions at crossing is had, when automobile will produce eddy current loss through out-of-date, the inductance of ring-type insulated line starts to reduce, passing through of automobile can be detected, but inductive coil volume is large, be about 2 meters × 2 meters, install inconvenient and easily damaged by pressure and be difficult to widely use.
(3) summary of the invention:
Due to the various wagon flow in intersection and the staggered current interference mutually of the stream of people, its traffic capacity reduces greatly compared with independent section, traffic behavior is more complicated, intersection has become the bottleneck of Traffic Net and congested in traffic occurring source, often cause local traffic to block up, affect the unimpeded of whole road network.In order to improve the safety intersection of vehicle, conflicting wagon flow does not allow to let pass to vehicle simultaneously, solution be in one-period, the time is divided into several sections and distribute to different wagon flow to vehicle let pass.The general traffic lights that all adopt command vehicle pass-through, its Traffic signal control is usually predicted with artificial or calculate traffic light time through complicated algorithm, then respectively with red, yellow, what the various combination of green light commanded both direction is open to traffic with forbidden, indicate as countdown with LED charactron, make vehicle obtain green light in conflicting wagon flow to the Different periods in one-period to let pass, and the wagon flow of mutually not conflicting to vehicle can obtain green light in the same period and let pass, thus a continuous time in one-period reaches the object of safety persuasion traffic current.
But the crossroad access signal lamp control system used is a kind of timing clearance system, when let pass in track or no thoroughfare for vehicles, the vehicle clearance time of its setting, the time was all changeless with no thoroughfare for vehicles, because crossroad often there will be the busy situation difference in each track, busy track vehicle is a lot, the clearance time seems too short, wagon flow is blocked up, the wagon flow of at this moment conflicting but seldom even does not have vehicle sometimes to track vehicle, but the vehicle on busy track also will wait for that the wagon flow of conflict terminated just to be allowed to let pass to fixing " clearance " time in idle track, this quality time just greatly wasted limited road traffic resource and go out pedestrian.
Therefore, employing assessment or Forecasting Methodology can only meet wagon flow to the requirement of traffic safety of not conflicting, and this is inadequate, need to measure each track vehicle fleet size in real time so that the timing scheme of real-time reasonable arrangement signal lamp.But, current various vehicle measurement means is only applicable to flow measurement mode vehicle flowrate because surveying instrument complex structure involves great expense measures assessment, for the real-time control of the intersection traffic signal had a large capacity and a wide range, its vehicle measuring equipment needs to possess the features such as structure is simple, installation is easy, cost is low.
Native system adopts flow export place, each track at the parting of the ways respectively to install one pair of laser-correlation device, the vehicle to be released such as whether to have for being identified in flow export place, track, and measure the vehicle number of letting pass by flow export place, track, the clearance time is calculated for rear crossroad access controller, measure the interval time of letting pass by the fore-aft vehicle at flow export place, track, for judging the vehicle congestion situation needing to let pass simultaneously.If conflict the green light time from wagon flow to track at the end of, the vehicle that this flow export place, track is etc. not to be released, then the green light time in this track gets the shortest time, and the described shortest time must look the sidewalk width of wagon flow to track of conflict, getting 15 seconds-30 seconds, passing through for allowing pedestrian.When green light, let pass by exceeding setting value the interval time of the fore-aft vehicle at flow export place, track if measured, such as 5-12 second, namely think that clearance vehicle is little, if now the green light time has exceeded the described shortest time, then enter green light countdown in 15 seconds immediately, otherwise get the shortest time.Described measurement is let pass by the vehicle number at flow export place, track, is to be used as rear crossroad access controller to calculate clearance time reference.Namely its green light time is received the vehicle data of letting pass in track, crossroad, front by RS485, calculate the vehicle number arrived and determine the clearance time, but this clearance time is also with vehicle stop off, lane change and delay, and actual failing enters the situations such as this clearance time zone, change the clearance time in real time by the interval time of fore-aft vehicle during measurement clearance.The concrete calculating clearance time is the vehicle number that the track sent by front crossroad access controller is flowed out, average speed calculates and arrives this crossroad time, draw the vehicle number waited for a green light, the time of blocking of its every portion vehicle and off time are added simultaneously, get identical value 2-4 second its off time, obtain the clearance time that this flows to track vehicle, and send its data to rear crossroad access controller through RS485 simultaneously, if this flows to the track green light time when closing to an end, according to the data that front crossroad access controller sends, still have and enter near this track green light clearance end time point more than 5-8 car, the wagon flow of simultaneously conflicting does not have vehicle to wait to track, then green light time delay 10-30 second, green time is longer, the vehicle number passed through is more, green time occupation rate reflects the bus capacity at crossing, namely should meet a wagon flow to vehicle pass-through demand larger, the green time distributing to it is longer, because this programme traffick number summation is more than waiting vehicle number, therefore the vehicle delay time at stop is substantially reduced.
Laser-correlation device is made up of emitter and receiving trap, in emitter, laser diode is installed, what it sent is a kind of invisible laser signal, due to the distance of laser-correlation here only 3 ﹒ 5-7 rice, and the laser diode pulse power adopting dutycycle little, rated power is got and is less than 0.5mW, is therefore safe not have any infringement also can not be dangerous to vehicle to the person.
Laser diode in laser-correlation device, the laser scanning pulse signal launched under Single-chip Controlling, each cycle of this signal is made up of two broad pulses and two burst pulses, the low level pulse that the ending transmission one of each cycle is wide, when with broad pulse representative digit " 1 ", burst pulse representative digit " 0 " then easily uses 4 kinds of different permutation and combination, such as 1010, 0110, 0101, 1100 etc., identify the laser scanning pulse signal that in the laser-correlation device on 4 tracks, laser diode sends, single-chip microcomputer adopts and interrupts or inquiry mode reception laser scanning pulse signal, and by single-chip microcomputer to its send and laser scanning pulse signal that it receives carry out pulse width and compare identification, extract the believable laser scanning pulse signal of this frequency, effective eliminating external interference.
When there being vehicle to pass through, associated laser produces obstruction signal to injection device, the laser scanning pulse signal that light receiver head receives send single-chip microcomputer process after filter and amplification shaping, single-chip microcomputer obtains breaking time to by the laser scanning pulse signal timing of interdicting, single-chip microcomputer is also to the laser scanning pulse count signal that light receiver head receives simultaneously, conversion obtains off time, wherein express certain vehicle breaking time and pass through the time, it is relevant with the speed of a motor vehicle and Vehicle length, also represent vehicle dwell time, a breaking time represents that a car passes through, therefore the vehicle count to passing through can be realized, represent fore-aft vehicle distance in wagon flow off time, also with temporarily pass through relevant with or without vehicle.
Crossroad comprise east orientation west, west eastwards, south orientation north, the southern wagon flow of north orientation to, every bar wagon flow to all comprising 1-2 Through Lane and track of turning left and turn right, above-mentioned wagon flow to each track flow export one pair of laser-correlation device is installed.The stop line of signal lamp intersection, represent the parking spot that vehicle waits for a green light, namely in the track midpoint of road surface stop line 0 ﹒ 5 meters-1 meter inwards, bury the laser diode of emitter underground, light receiver head in its receiving trap is installed on the traffic signals lamp stand of trackside or the transverse arm of special column, if the stop line of traffic signals lamp stand and track flow export has certain distance, when calculating is waited several, be converted to by this distance number of waiting, be generally 1-3 car.For the ease of the debugging of laser-correlation device, transverse arm is installed on directly over laser diode, namely the plane orthogonal that formed of transverse arm and laser diode is in road surface, transverse arm height is 3 ﹒ 5 meters-7 meters, transverse arm length gets 3-6 rice depending on width of roadway, transverse arm is provided with equally distributed 3-4 the light receiver head corresponding with track.At the circular hole that the laser diode installation site drill diameter on road surface is the dark 20CM of 8-12CM, be the steel pipe of 8-12CM height 20CM by resin glue fixed outer diameter in circular hole, steel pipe bottom welding bottom seals, steel pipe two bottom sides leaves the hole of drainpipe and cable tube, drainpipe is through the lower end of steel tubing portions, be drilled with several aperture for steel duct water flowing, above the drainpipe bottom steel pipe, place wire netting, for isolating sandstone.Steel duct is welded with support, and fixed head is fixed on support, and laser diode external member is fixed on fixed head, support leaves the hole of strip, for through screw, makes fixed head fixed position adjustable.Light that in laser-correlation device, laser diode sends must aim at the light receiver head in receiving trap, can help to aim at by laser orientation instru-ment etc., aims at rear screw, pad, anti-skid washer, silica gel Shockproof gasket make fixed head be fixed on support.Road surface install steel pipe upper end fix a cover plate through screw, a circular glass sheet is inlayed at cover plate central position, for the light sent through laser diode, circular glass plate plane a little less than metal cover board plane to reduce friction.
(4) accompanying drawing illustrates:
Fig. 1 is that crossroad wagon flow is to distribution plan;
Fig. 2 is that described laser diode buries schematic diagram underground.
(5) embodiment:
When crossroad access signal lamp becomes, the crossroad wagon flow of control system to distribution plan as shown in Figure 1, this crossroad wagon flow is to distribution plan, only represent the one that various dissimilar wagon flow controls to distribution and wagon flow thereof, when other type wagon flow becomes to the crossroad access signal lamp that distribution and wagon flow thereof control, control system is easily obtained by analogy.When in Fig. 1 being East and West direction when red, in north-south, A is the straight-through green light time with turning right, and B is the green light time of turning left
Described laser diode buries schematic diagram underground as shown in Figure 2.Its structure comprises: steel pipe (1), cover plate (2), circular glass sheet (3), laser diode external member (4), fixed head (5), screw kit (6), support (7), terminal box (8), wire (9), wire netting (10), cable tube (11), drainpipe (12), bottom (13) are formed, and wherein screw kit (6) is made up of screw, nut, pad, anti-skid washer, silica gel Shockproof gasket.During installation, support (7) plane center line should with line parallel in the transverse arm installing light receiver head.For the hole through screw in screw kit (6) on support (7), it is a kind of elongate aperture along support (7) plane center line direction, make fixed head (5) fixed position adjustable, and by screw, nut, pad, anti-skid washer, silica gel Shockproof gasket, fixed head (5) is fixed on support (7).
Traffic controller is made up of single-chip microcomputer 89C52, EEPRAM24C32, RS485 module, light-emitting diode display module and power module, wherein RS485 module is used for the communication between each crossroad access controller, it adopts RS-485 to carry out serial communication by single-chip microcomputer, and RS485 module needs the serial line interface of Transistor-Transistor Logic level to be converted to RS-485 serial line interface by MAX485 chip.EEPRAM24C32 is for preserving data, and light-emitting diode display module comprises driving circuit and display circuit, and it connects, by Single-chip Controlling with the I/O mouth of single-chip microcomputer 89C52.
Claims (2)
1. control system when crossroad access signal lamp becomes, it is characterized in that, adopt flow export place, each track at the parting of the ways that one pair of laser-correlation device is respectively installed, the vehicle to be released such as whether to have for being identified in flow export place, track, and measure the vehicle number of letting pass by flow export place, track, calculate the clearance time for rear crossroad access controller, measure the interval time of letting pass by the fore-aft vehicle at flow export place, track simultaneously, for judging the vehicle congestion situation needing to let pass, if conflict the green light time from wagon flow to track at the end of, the vehicle that this flow export place, track is etc. not to be released, then the green light time in this track gets the shortest time, the described shortest time must look the sidewalk width of wagon flow to track of conflict, being taken as 15 seconds-30 seconds, passing through for allowing pedestrian, its green light time is received the vehicle data of letting pass in track, crossroad, front by RS485, calculate the vehicle number arrived and determine the clearance time, but this clearance time is also with vehicle stop off, lane change and delay and actual situation of failing to enter this clearance time zone, when green light, let pass by exceeding setting value the interval time of the fore-aft vehicle at flow export place, track if measured, namely think that clearance vehicle is little, if now the green light time has exceeded the described shortest time, then enter green light countdown in 15 seconds immediately, if this flows to the track green light time when closing to an end, according to the data that front crossroad access controller sends, still have and enter near this track green light clearance end time point more than 5-8 car, the wagon flow of simultaneously conflicting does not have vehicle to wait to track, then green light time delay 10-30 second, green time is longer, the vehicle number passed through shortens the vehicle delay time at stop more,
Laser-correlation device is made up of emitter and receiving trap, due to the distance of laser-correlation here only 3 ﹒ 5-7 rice, and the laser diode pulse power adopting dutycycle little, rated power is got and is less than 0.5mW, is therefore safe not have any infringement also can not be dangerous to vehicle to the person;
Laser diode in laser-correlation device, the laser scanning pulse signal launched under Single-chip Controlling, each cycle of this signal is made up of two broad pulses and two burst pulses, the low level pulse that the ending transmission one of each cycle is wide, when with broad pulse representative digit " 1 ", burst pulse representative digit " 0 " then easily uses 4 kinds of different permutation and combination: 1010, 0110, 0101, 1100, identify the laser scanning pulse signal that in the laser-correlation device on 4 tracks, laser diode sends, single-chip microcomputer adopts and interrupts or inquiry mode reception laser scanning pulse signal, and by single-chip microcomputer, it is sent carry out pulse width with received laser scanning pulse signal and compare identification, extract the believable laser scanning pulse signal of this frequency, effective eliminating external interference,
Above-mentioned wagon flow to the track midpoint of flow export road surface, each track stop line 0 ﹒ 5 meters-1 meter inwards, bury the laser diode of emitter underground, light receiver head in its receiving trap is installed on the traffic signals lamp stand of trackside or the transverse arm of special column, if the stop line of traffic signals lamp stand and track flow export has certain distance, when calculating is waited several, number of waiting is converted to by this distance, for the ease of the debugging of laser-correlation device, transverse arm is installed on directly over laser diode, namely the plane orthogonal that formed of transverse arm and laser diode is in road surface, transverse arm height is 3 ﹒ 5 meters-7 meters, transverse arm length gets 3-6 rice depending on width of roadway, transverse arm is provided with equally distributed 3-4 the light receiver head corresponding with track, at the circular hole that the laser diode installation site drill diameter on road surface is the dark 20CM of 8-12CM, be the steel pipe of 8-12CM height 20CM by resin glue fixed outer diameter in circular hole, steel pipe bottom welding bottom seals, steel pipe two bottom sides leaves the hole of drainpipe and cable tube, drainpipe is through the lower end of steel tubing portions, be drilled with several aperture for steel duct water flowing, wire netting is placed above drainpipe bottom steel pipe, for isolating sandstone, steel duct is welded with support, fixed head is fixed on support, laser diode external member is fixed on fixed head, support leaves the hole of strip, for passing screw, make fixed head fixed position adjustable, the light that in laser-correlation device, laser diode sends must aim at the light receiver head in receiving trap, can help to aim at by laser orientation instru-ment etc., aim at rear screw, pad, anti-skid washer, silica gel Shockproof gasket makes fixed head be fixed on support, a cover plate is fixed through screw in the steel pipe upper end of installing on road surface, a circular glass sheet is inlayed at cover plate central position, for the light sent through laser diode, circular glass plate plane a little less than metal cover board plane to reduce friction.
2. control system when crossroad access signal lamp according to claim 1 becomes, is characterized in that comprising:
Fig. 2 is that described laser diode buries figure underground, by steel pipe (1), cover plate (2), circular glass sheet (3), laser diode external member (4), fixed head (5), screw kit (6), support (7), terminal box (8), wire (9), wire netting (10), cable tube (11), drainpipe (12), bottom (13) is formed, wherein screw kit (6) is by screw, nut, pad, anti-skid washer, silica gel Shockproof gasket forms, during installation, support (7) plane center line should with line parallel in the transverse arm installing light receiver head, for the hole through screw in screw kit (6) on support (7), it is a kind of elongate aperture along support (7) plane center line direction, make fixed head (5) fixed position adjustable, and pass through screw, nut, pad, anti-skid washer, silica gel Shockproof gasket makes fixed head (5) be fixed on support (7).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105405303A (en) * | 2015-12-18 | 2016-03-16 | 佛山市高明区云大机械科技有限公司 | Traffic control method based on traffic flow |
| CN105427630A (en) * | 2015-12-18 | 2016-03-23 | 佛山市高明区云大机械科技有限公司 | Traffic control system based on traffic flow |
| CN107945538A (en) * | 2017-04-06 | 2018-04-20 | 青岛翰兴知识产权运营管理有限公司 | A kind of intelligent traffic signal control method |
| CN108417053A (en) * | 2018-02-26 | 2018-08-17 | 江苏大学 | A kind of photoelectric detection system and control method suitable for T-junction mouth |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108417053A (en) * | 2018-02-26 | 2018-08-17 | 江苏大学 | A kind of photoelectric detection system and control method suitable for T-junction mouth |
| CN108417053B (en) * | 2018-02-26 | 2020-08-28 | 江苏大学 | Photoelectric detection device suitable for T-shaped intersection and control method |
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