CN105118290A - Intersection induction signal control system and method based on RFID vehicle-borne electronic tag - Google Patents
Intersection induction signal control system and method based on RFID vehicle-borne electronic tag Download PDFInfo
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- CN105118290A CN105118290A CN201510432848.6A CN201510432848A CN105118290A CN 105118290 A CN105118290 A CN 105118290A CN 201510432848 A CN201510432848 A CN 201510432848A CN 105118290 A CN105118290 A CN 105118290A
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Abstract
The invention discloses an intersection induction signal control system based on an RFID vehicle-borne electronic tag and a method thereof. The intersection induction signal control system comprises a bottom-end information acquisition system, a communication system, and a traffic control system. The intersection induction signal control system reads information of vehicles equipped with an active electronic tag within the range of a road section through an RFID reader arranged at an intersection; the density of vehicles within the range of the road section is detected by the RFID reader as an evaluation standard for whether the green time of lights under induction control is prolonged; and the lights remain green when the density of vehicles is higher than a threshold, or, the phase is switched. Simulation experiment and contrastive analysis show that real-time and effective traffic signal control can be achieved at a high-saturation intersection by the improved induction control strategy, the defect that traditional induction control with the time interval of vehicles as the standard for prolonging green time fails at high saturation is overcome, the utilization rate of green lights at urban intersections is improved significantly, and urban traffic congestion is alleviated.
Description
Technical field
The present invention is based on the traffic data collection technology of RFID vehicle carried electronic label, be specifically related to intersection signal induction control system and method.
Background technology
Effective traffic signalization solves the most direct mode of urban congestion.Traffic data is detected as main (as magnetic strength, video, ultrasound wave, infrared etc.) with all kinds of section for a long time, and a series of traffic flow model is also set up based on such data.Section detects and mainly contains two shortcomings: infer that section and even road network state have relatively large deviation with section traffic behavior; Section vehicle detection can not provide OD(the beginning and the end of wagon flow) information.The traffic control system built with this can not play the overall utility of road network mostly, and too short-sighted process of simply blocking up, makes control system to play a role.
Existing induction controls based on utilizing the geomagnetic induction coil after stop line to detect the time interval between vehicle, whether the real-time intervals Time dependent according to detecting between vehicle extends green light, if the convoy spacing time detected is less than the interval (GAP) preset, then gives green light and extend; Otherwise then stop giving green light to extend.
Study the state of development that domestic and international urban traffic signal single-point controls, in conjunction with existing RFID detection technique, on existing performance basis, control to further investigate to single point signals.For coil-induced control two point defect of current widespread use the most, make improvement.
1. under high saturation volume, control strategy lost efficacy: time flow is larger, convoy spacing is less than interval (GAP) all the time, and signal lamp tends to reach maximum green, and the cycle, occasioned a delay increase often beyond actual demand.Therefore to control effect under high saturation condition poor in induction.
2. the interval before queue, can cut off whole queue: due to an excessive interval, may block whole queue, cause green light to switch, occasion a delay increase.As shown in Figure 2.
Therefore, the present invention proposes a kind of crossing induction control method based on RFID vehicle carried electronic label.Utilize the rfid interrogator being arranged on crossing, read interval, section and electronic license plate vehicle number is housed.Using section, interval traffic density is as Con trolling index, ensures continually to pass through crossing with the traffic flow of fleet's form intensive arrival crossing.
Summary of the invention
The present invention is directed to coil-induced control two point defect of above-mentioned current widespread use the most, make improvement, a kind of crossing actuated signal control system and method based on RFID vehicle carried electronic label is provided.
Technical solution of the present invention is:
A kind of crossing actuated signal control system based on RFID vehicle carried electronic label, it is characterized in that, this system comprises bottom information acquisition system, communication system, traffic control system three part, and described bottom-up information acquisition system comprises rfid interrogator and vehicle carried electronic label; Described communication system refers to that rfid interrogator will detect the data obtained information by RS485 bus transfer to controller; Described traffic control system is that controller is by the timing according to the road vehicle information adjustment signal lamp gathered.
Based on a crossing actuated signal control method for RFID vehicle carried electronic label, be characterized in, the method specifically comprises the steps:
(1) when the vehicle being provided with active electronic label sails the read range of rfid interrogator into, the rfid interrogator of trackside reads information of vehicles, the interval vehicle fleet size in record section, thus calculates traffic density in road section scope;
(2) the vehicle data information that rfid interrogator reads sends data to crossing controller by RS485 bus, the data that controller utilizes rfid interrogator to obtain, if traffic density is higher than threshold value in interval, section
, then green light is extended, until maximum green light; When section traffic density is lower than threshold value
, then stop extending green light, switch to next phase place, generate induced signal scheme;
(3) controller utilizes the signal lamp of generation induced signal scheme to crossing to control in real time.
Beneficial effect of the present invention is:
Under low saturation, responding to based on RFID after heritage should control and improve controls all to be better than fixing timing control, and responding to based on RFID after improvement controls should control basis has certain benefit promote in heritage.When high saturation, traditional intersection vehicles mean delay controlled based on the induction of Coil Detector significantly increases, and even than fixing timing inefficiencies, thus control efficiency is low.Contrast therewith, the control effects under high saturation of the induction control strategy after improvement is obviously better than fixing timing and heritage should control, and can reduce intersection vehicles mean delay significantly, thus improves the traffic efficiency of crossing.This just overcomes the defect that heritage should control to lose efficacy under high saturation.
Accompanying drawing explanation
Fig. 1 is the crossing actuated signal control system chart based on RFID vehicle carried electronic label;
Fig. 2 is that vehicle reaches situation map at random;
Fig. 3 is the information of vehicles reading schematic diagram based on RFID;
Fig. 4 is Two-phases signal schematic diagram;
Fig. 5 is signal control flow chart.
Embodiment
For making the object of the embodiment of the present invention, by reference to the accompanying drawings, the present invention is clearly and completely described.As shown in Figure 1, the intersection signal induction control system based on RFID vehicle carried electronic label is made up of bottom information acquisition system, communication system, traffic control system three part.When the vehicle being provided with active electronic label sails the read range of rfid interrogator into, the rfid interrogator of trackside reads information of vehicles, the interval vehicle fleet size in record section, as shown in Figure 3.The vehicle data information of reading is sent data to crossing controller by RS485 bus by rfid interrogator.The data that controller utilizes rfid interrogator to obtain, if traffic density is higher than threshold value in interval, section
, then green light is extended, until maximum green light; When section traffic density is lower than threshold value
, then stop extending green light, switch to next phase place, generate induced signal scheme.Controller utilizes the signal lamp of generation actuated signal control scheme to crossing to control in real time.
Fig. 4 is using crossing, two phase place bicycle road as simulation example.To each access mouth flow 100
, 200
, 300
, 400
, 500
, 600
emulate in situation, flow covers low saturation, middle saturation degree, the closely saturated vehicle flowrate situation with high saturation, the fixing timing of contrast, the actual effect controlling based on Coil Detector induction and control based on electronic license plate induction, using mean delay as evaluation index.Based on VISSIM micro-simulation simulator, secondary development is carried out to its VISSIM-COM interface and devises emulation platform.VISSIM simulation software is developed by German PTV company, is a kind of microcosmic, simulation modeling instrument based on the time interval and driving behavior, for modeling and urban transportation operation conditions under evaluating various transportation condition.VAP(VehicleActuatedProgramming) be for traffic responsive steering logic language, can embed in VISSIM and realize induction control.Synchro software is that a kind of traffic signals are coordinated and timing design software, and this software can calculate rational signal time distributing conception according to automotive performance, driving behavior custom, traffic law etc.
Fixing timing scheme draws after utilizing signal optimizing timing software Synchro7 to optimize according to each entrance driveway vehicle condition.Based on coil-induced control program, before being arranged on each entrance driveway stop line in crossing by inductive coil, loop length about 20 meters; The minimum green time of each phase place in crossing is set to 5 seconds, and maximum green time is set to 35 seconds; Corresponding red time gets 3 seconds, and yellow time gets 4 seconds.Emulation utilize micro-simulation simulator VISSIM self with VAP control module.The present invention adopts 2.4G active electronic label as electronic license plate prototype, and effective read range of this electronic tag is 100-150 rice, and read range is decided to be 80 meters by emulation experiment.Wherein traffic density threshold value is set to 2/80 meters, then switches green light when vehicle in 80 meters is less than 2.
Each simulation time is 3600 seconds (60 minutes), and for preventing phantom error, emulation warming up period gets first 900 seconds, not as emulation benefit.The mean delay of vehicle and average stop frequency carry out statistical study in the time period of 45 minutes between time period 900-3600 second.Simulation result shows, threshold value is very large for the impact of induction control effects, selects suitable threshold value to be the key factor realizing electronic license plate induction control.Analysis result, it is most suitable that threshold value chooses 0.025veh/m, and the crossing induction that can realize based on RFID vehicle carried electronic label controls greatest benefit.
Fig. 5 is Two-phases signal control flow chart.First give main line green light right-of-way, after minimum green end, if traffic density is higher than threshold value in interval, section
, then green light is extended, until maximum green light; When section traffic density is lower than threshold value
, then stop extending green light, green light right-of-way switches to branch line.The control flow also similar arterial control of branch line.
Experiment simulation contrast incured loss through delay by table 1. vehicle
The simulation experiment result is as shown in table 1.Under low saturation, responding to based on RFID after heritage should control and improve controls all to be better than fixing timing control, and responding to based on RFID after improvement controls should control basis has certain benefit promote in heritage.When high saturation, traditional intersection vehicles mean delay controlled based on the induction of Coil Detector significantly increases, and even than fixing timing inefficiencies, thus control efficiency is low.Contrast therewith, induction control strategy after improvement control effects under high saturation is obviously better than fixing timing and heritage should control, intersection vehicles mean delay can be reduced significantly, thus improving the traffic efficiency of crossing, this just overcomes the defect that heritage should control to lose efficacy under high saturation.
Claims (2)
1. the crossing actuated signal control system based on RFID vehicle carried electronic label, it is characterized in that, this system comprises bottom information acquisition system, communication system, traffic control system three part, and described bottom-up information acquisition system comprises rfid interrogator and vehicle carried electronic label; Described communication system refers to that rfid interrogator will detect gained vehicle data information by RS485 bus transfer to controller; Described traffic control system is that controller is by the signal timing dial according to road vehicle information adjustment signal lamp.
2., based on a crossing actuated signal control method for RFID vehicle carried electronic label, it is characterized in that, the method specifically comprises the steps:
(1) when the vehicle being provided with active electronic label sails the read range of rfid interrogator into, the rfid interrogator of trackside reads information of vehicles, the interval vehicle fleet size in record section;
(2) the vehicle data information that rfid interrogator reads sends data to crossing controller by RS485 bus, and the data that controller utilizes rfid interrogator to obtain determine whether extend green light, if traffic density is higher than threshold value in interval, section
, then green light is extended, until maximum green light; When section traffic density is lower than threshold value
, then stop extending green light, switch to next phase place, generate induced signal;
(3) controller utilizes the signal lamp of induced signal scheme to crossing to control in real time.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373411A (en) * | 2016-11-04 | 2017-02-01 | 东南大学 | Single point signal control optimization method based on intersection vehicle passing records |
| CN106960578A (en) * | 2017-05-19 | 2017-07-18 | 苏州健雄职业技术学院 | A kind of traffic control system and its method of work based on RFID |
| CN107045791A (en) * | 2017-03-16 | 2017-08-15 | 王德旺 | The implementation method of automobile and motorcycle Intelligent traffic management systems |
| CN107316469A (en) * | 2017-06-14 | 2017-11-03 | 苏州远征魂车船技术有限公司 | A kind of intelligent traffic system of traffic lights interval networking |
| CN108022328A (en) * | 2017-12-25 | 2018-05-11 | 重庆冀繁科技发展有限公司 | Vehicular satellite positions Tachographs terminal |
| CN108091147A (en) * | 2017-12-25 | 2018-05-29 | 重庆冀繁科技发展有限公司 | Wagon flow monitoring method based on satellite positioning Tachographs terminal |
| CN108109402A (en) * | 2017-12-25 | 2018-06-01 | 重庆冀繁科技发展有限公司 | Road transport vehicle satellite positioning system services platform |
| CN109801496A (en) * | 2019-01-31 | 2019-05-24 | 苏州卷积智能信息技术有限公司 | Traffic lights vehicle congestion statistical system and method |
| CN111033178A (en) * | 2017-08-03 | 2020-04-17 | 福特全球技术公司 | Crossroad crossing control |
| CN111081039A (en) * | 2019-12-31 | 2020-04-28 | 同济大学 | Real-time dynamic intersection signal control design method and system |
| CN113516858A (en) * | 2021-07-16 | 2021-10-19 | 北京东土正创科技有限公司 | Traffic light control method, traffic light network system and traffic light node |
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2015
- 2015-07-22 CN CN201510432848.6A patent/CN105118290A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373411A (en) * | 2016-11-04 | 2017-02-01 | 东南大学 | Single point signal control optimization method based on intersection vehicle passing records |
| CN107045791A (en) * | 2017-03-16 | 2017-08-15 | 王德旺 | The implementation method of automobile and motorcycle Intelligent traffic management systems |
| CN106960578A (en) * | 2017-05-19 | 2017-07-18 | 苏州健雄职业技术学院 | A kind of traffic control system and its method of work based on RFID |
| CN107316469A (en) * | 2017-06-14 | 2017-11-03 | 苏州远征魂车船技术有限公司 | A kind of intelligent traffic system of traffic lights interval networking |
| CN111033178A (en) * | 2017-08-03 | 2020-04-17 | 福特全球技术公司 | Crossroad crossing control |
| CN108022328A (en) * | 2017-12-25 | 2018-05-11 | 重庆冀繁科技发展有限公司 | Vehicular satellite positions Tachographs terminal |
| CN108091147A (en) * | 2017-12-25 | 2018-05-29 | 重庆冀繁科技发展有限公司 | Wagon flow monitoring method based on satellite positioning Tachographs terminal |
| CN108109402A (en) * | 2017-12-25 | 2018-06-01 | 重庆冀繁科技发展有限公司 | Road transport vehicle satellite positioning system services platform |
| CN109801496A (en) * | 2019-01-31 | 2019-05-24 | 苏州卷积智能信息技术有限公司 | Traffic lights vehicle congestion statistical system and method |
| CN111081039A (en) * | 2019-12-31 | 2020-04-28 | 同济大学 | Real-time dynamic intersection signal control design method and system |
| CN113516858A (en) * | 2021-07-16 | 2021-10-19 | 北京东土正创科技有限公司 | Traffic light control method, traffic light network system and traffic light node |
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Application publication date: 20151202 |