CN111243302B - Intersection flow density induction control method - Google Patents
Intersection flow density induction control method Download PDFInfo
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- CN111243302B CN111243302B CN202010101017.1A CN202010101017A CN111243302B CN 111243302 B CN111243302 B CN 111243302B CN 202010101017 A CN202010101017 A CN 202010101017A CN 111243302 B CN111243302 B CN 111243302B
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
- G08G1/08—Controlling traffic signals according to detected number or speed of vehicles
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
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- G—PHYSICS
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- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/095—Traffic lights
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Abstract
The invention discloses an intersection flow density induction control method, which comprises a detector arranged at an intersection of a bridge and a tunnel; the detector collects whether vehicles arrive at the intersection and the arrival time of the vehicles, and sends out the collected data in batches; obtaining real-time changes in traffic flow based on data collected by the detector by adjusting the variable initial green light time duration gi,ciAnd extending the green light time length gi,yiAdjusting the phase timing of the signals; at the initial time of phase, setting the minimum green time length giminVariable initial green time length gi,ciTime length g of minimum green lightimin(ii) a Calculating the green light time length of the green light stage of the intersection according to the data collected by the detector during the period of the crossed yellow light and red light; green light time length giIs variable initial green light time length gi,ciPlus an extended green time period gi,yi. The invention improves the effective utilization rate of the green light duration and reduces the delay through the initial green light duration suitable for the traffic demand and the dynamically-changed green prolonging control mode.
Description
Technical Field
The invention relates to the technical field of traffic control, in particular to an intersection flow density induction control method.
Background
Intersections in the core city area with closely related traffic flow need to adopt regional networking coordination control systems. However, at intersections such as suburbs, high-tech parks and the like where traffic flows are not very large and main road branches and secondary road branches intersect, networking control cost is too high, and waste of green light use efficiency can be caused by timing control.
The existing traffic signal control comprises single-point control and networking control. The single-point control comprises timing control and multi-period control. And (4) networking control, including timing control and adaptive control. The existing control methods basically take the section flow as input, and obtain the phase green light duration according to certain calculation, so that the cost is overhigh or the use efficiency of the green light is wasted in practical application.
Therefore, how to automatically adjust the signal lamps of the intersections according to the flow demand and the traffic flow density of each entrance lane becomes a technical problem which needs to be solved by the technicians in the field.
Disclosure of Invention
In view of the above defects of the prior art, the present invention provides an intersection flow density sensing control method, which can automatically calculate the phase initial green light time length according to the flow demand and the traffic flow density of each entrance way, and dynamically adjust and prolong the green light time length according to the time interval of the vehicle arriving at the vehicle head, so as to respond to the traffic demand, reduce the vehicle waiting time, and effectively improve the use efficiency of the green light.
In order to achieve the purpose, the invention discloses an intersection flow density induction control method which comprises detectors arranged at each entrance lane of a road intersection.
The detector collects whether a vehicle arrives at the intersection or not and the arrival time of the vehicle, and sends out the collected data in batches;
obtaining real-time change of traffic flow according to data collected by the detector, and adjusting the time length g of variable initial green lighti,ciAnd extending the green light time length gi,yiAdjusting the phase timing of the signals;
at the initial time of phase, setting the minimum green time length giminSaid variable initial green time length gi,ci> said minimum green time length gimin；
Calculating the green time length g of the green stage of the intersection according to the data collected by the detector during the yellow and red periods of the intersectioni；
The green light time length giIs said variable initial green light time length gi,ciPlus an extended green time period gi,yiFormula (ii)The following were used:
gi＝gi,ci+gi,yi；
preferably, the variable initial green light time length gi,ciThe calculation formula of (a) is as follows:
gi,ci＝a*qi,yr；
wherein, gi,ciIs the variable initial green light time length; a is the average release time length of the vehicle from starting to passing through the intersection, and the unit is second/vehicle; q. q.s i,yrThe number of vehicles accumulated during the period of the yellow and red light of the phase is calculated; gimaxMaximum green duration; giminThe preset minimum green light duration is smaller than the preset maximum green light.
Preferably, the extended green time length gi,yiIs the length g of the extended green light time calculated according to a fixed step lengthi,ygiAnd variable extension of green time length gi,ybiThe formula is as follows:
wherein: giThe duration of the green light of the ith phase; gi,yiTo extend the green light time period; gi,ygiThe time length of the prolonged green light is calculated according to the fixed step length; gybiIs the length of the extended green time calculated according to the variable shortening step length; b is a fixed step length; q. q.sygiThe number of vehicles which arrive in succession in the green period is prolonged for the phase fixed step length; c. Ci,ybiDynamically shortening the step length; q. q.sybiTo dynamically extend green-time vehicle arrivals; gapq,q+1The headway of 2 adjacent vehicles; GAP is a preset minimum headway.
Preferably, the calculation formula of the distance D between the detector and the stop line of the intersection is as follows:
D＝S*b；
wherein D is the distance between the detector and the stop line; s is the average speed of each vehicle passing the detector; b is the unit extension time of the sensor control of the detector.
Preferably, the length g of the prolonged green light time is set to be shortened i,yiIn the case of the green time of the front phase, the green time length g is uniformly extendedi,yiAccording to the vehicle arrival condition, the green light time length g is adjustediMaking an extension, upon reaching a shortening of said extended green time length gi,yiAt the moment of time (g), dynamically shortening the extended green time length gi,yiAnd reducing the time length of the maximum green light or the time headway of the arriving vehicle to the set minimum time headway.
Preferably, the detector is a loop coil detector, a video detector or a radar.
The invention has the beneficial effects that:
the invention improves the effective utilization rate of the green light duration and reduces the delay through the initial green light duration suitable for the traffic demand and the dynamically-changed green prolonging control mode.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 shows a flow-density sensing control flow diagram according to an embodiment of the present invention.
Detailed Description
Examples
As shown in FIG. 1, the invention discloses an intersection flow density sensing control method, which comprises detectors arranged at each entrance lane of a road intersection.
The detector collects whether a vehicle arrives at the intersection or not and the arrival time of the vehicle, and sends out the collected data in batches;
obtaining real-time change of traffic flow according to data collected by the detector, and adjusting the changeInitial green light time length gi,ciAnd extending the green light time length gi,yiAdjusting the phase timing of the signals;
at the initial time of phase, setting the minimum green time length giminSaid variable initial green time length gi,ci> said minimum green time length gimin；
Calculating the green time length g of the green stage of the intersection according to the data collected by the detector during the yellow and red periods of the intersectioni；
The green light time length giIs said variable initial green light time length gi,ciPlus an extended green time period gi,yiThe formula is as follows:
gi＝gi,ci+gi,yi。
the principle of the invention is as follows: as shown in fig. 1, the flow-density sensing control is based on real-time change of traffic flow, and by setting the initial green light variable and the extended green light variable, and adjusting signal phase timing, the sensing control parameters are more suitable for the traffic flow, the utilization rate of the green-to-noise ratio is improved, and delay is reduced. And according to the unified extension green, the green light time length is extended according to the arrival of the vehicle, and when the arrival time is shortened and the green is extended, the extension green is dynamically shortened until the maximum green or the arrival time span is reduced to the set minimum time span.
In the invention, the initial green duration of each signal lamp cycle, i.e. phase 1 green duration, is variable; the extended green time period is obtained by accumulating the gap (spacing) between all the adjacent 2 vehicles in the last signal lamp cycle, and if the gap is reduced to the set minimum headway, the process is terminated or the total time exceeds the preset maximum green time period.
The main input parameters of the invention are the flow collected during the yellow light and red light periods of the phase and the interval (namely the density) between vehicles, and the green light duration of the phase is determined according to the 2 parameters. The invention is suitable for intersections with low traffic flow in suburbs and the like, can avoid the idle discharge of green lights and can furthest ensure the utilization of the duration of the green lights.
In some embodiments, the variable initial green time length gi,ciThe calculation formula of (a) is as follows:
gi,ci＝a*qi,yr；
wherein, gi,ciIs the variable initial green light time length; a is the average release time length of the vehicle from starting to passing through the intersection, and the unit is second/vehicle; q. q.si,yrThe number of vehicles accumulated during the period of the yellow and red light of the phase is calculated; gimaxMaximum green duration; giminThe preset minimum green light duration is smaller than the preset maximum green light.
In certain embodiments, the extended green time length gi,yiIs the length g of the extended green light time calculated according to a fixed step lengthi,ygiAnd variable extension of green time length gi,ybiThe formula is as follows:
gi，yi＝gi，ygi+gi，ybi；
wherein: giThe duration of the green light of the ith phase; gi,yiTo extend the green light time period; gi,ygiThe time length of the prolonged green light is calculated according to the fixed step length; gybiIs the length of the extended green time calculated according to the variable shortening step length; b is a fixed step length; q. q.sygiThe number of vehicles which arrive in succession in the green period is prolonged for the phase fixed step length; c. Ci,ybiDynamically shortening the step length; q. q.sybiTo dynamically extend green-time vehicle arrivals; gapq,q+1The headway of 2 adjacent vehicles; GAP is a preset minimum headway.
In some embodiments, the distance D between the detector and the stop line of the intersection is calculated as follows:
D＝S*b；
wherein D is the distance between the detector and the stop line; s is the average speed of each vehicle passing the detector; b is the unit extension time of the sensor control of the detector.
In some embodiments, the extended green time period g is set to be shortenedi,yiIn the case of the green time of the front phase, the green time length g is uniformly extended i,yiAccording to the vehicle arrival condition, the green light time length g is adjustediMaking an extension, upon reaching a shortening of said extended green time length gi,yiAt the moment of time (g), dynamically shortening the extended green time length gi,yiAnd reducing the time length of the maximum green light or the time headway of the arriving vehicle to the set minimum time headway.
In certain embodiments, the detector is a loop coil detector, a video detector, or a radar.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (5)
1. The intersection flow density induction control method is characterized by comprising detectors arranged at each entrance lane of a road intersection;
the detector collects whether a vehicle arrives at the intersection or not and the arrival time of the vehicle, and sends out the collected data in batches;
Obtaining real-time change of traffic flow according to data collected by the detector, and adjusting the time length g of variable initial green lighti,ciAnd extending the green light time length gi,yiAdjusting the phase timing of the signals;
at the initial time of phase, setting the minimum green time length giminSaid variable initial green time length gi,ci> said minimum green time length gimin；
Calculating the green time length g of the green stage of the intersection according to the data collected by the detector during the yellow and red light periods of the intersectioni；
The green light time length giIs said variable initial green light time length gi,ciPlus an extended green time period gi,yiThe formula is as follows:
gi＝gi,ci+gi,yi；
the extended green time length gi,yiIs the length g of the extended green light time calculated according to a fixed step lengthi,ygiAnd variable extension of green time length gi,ybiThe formula is as follows:
wherein: giThe duration of the green light of the ith phase; gi,yiTo extend the green light time period; gi,ygiThe time length of the prolonged green light is calculated according to the fixed step length; gybiIs the length of the extended green time calculated according to the variable shortening step length; b is a fixed step length; q. q.sygiThe number of vehicles which arrive in succession in the green period is prolonged for the phase fixed step length; c. Ci,ybiDynamically shortening the step length; q. q.sybiTo dynamically extend green-time vehicle arrivals; gap q,q+1The headway of 2 adjacent vehicles; GAP is a preset minimum headway; gimaxThe maximum green time period.
2. The intersection flow density induction control method according to claim 1Characterized in that said variable initial green time length gi,ciThe calculation formula of (a) is as follows:
gi,ci＝a*qi,yr；
wherein, gi,ciIs the variable initial green light time length; a is the average release time length of the vehicle from starting to passing through the intersection, and the unit is second/vehicle; q. q.si,yrThe number of vehicles accumulated during the period of the yellow and red light of the phase is calculated; giminThe preset minimum green light duration is smaller than the preset maximum green light.
3. The intersection traffic density sensing control method according to claim 1, characterized in that a calculation formula of a distance D between the detector and a stop line of the intersection is as follows:
D＝S*b；
wherein D is the distance between the detector and the stop line; s is the average speed of each vehicle passing the detector; b is the unit extension time of the sensor control of the detector.
4. The intersection traffic density sensing control method according to claim 1, characterized in that the extension green time length g is shortened when any green light is set i,yiAnd prolonging the green light time of the previous phase according to a fixed step length and the green light time length g of the green light of the previous phase according to the vehicle arrival conditioniIs reached to shorten the extended green light time length gi,yiDynamically shortening the green light and prolonging the green light time length gi,yiUntil the average of the shortened green light time and the green light time extended by the previous phase is set to be the maximum green light time length, or the arrival time of the vehicleThe headway is reduced to a set minimum headway.
5. The intersection traffic density induction control method of claim 1, wherein the detector is a loop detector, a video detector, or a radar.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6339383B1 (en) * | 1999-11-05 | 2002-01-15 | Sumitomo Electric Industries, Ltd. | Traffic signal control apparatus optimizing signal control parameter by rolling horizon scheme |
| CN101968930A (en) * | 2010-11-02 | 2011-02-09 | 徐笑晓 | Crossing signal light control method |
| CN104794910A (en) * | 2015-04-27 | 2015-07-22 | 江苏物联网研究发展中心 | Queuing length based fully-actuated signal control method with phase jumping function |
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- 2020-02-19 CN CN202010101017.1A patent/CN111243302B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6339383B1 (en) * | 1999-11-05 | 2002-01-15 | Sumitomo Electric Industries, Ltd. | Traffic signal control apparatus optimizing signal control parameter by rolling horizon scheme |
| CN101968930A (en) * | 2010-11-02 | 2011-02-09 | 徐笑晓 | Crossing signal light control method |
| CN104794910A (en) * | 2015-04-27 | 2015-07-22 | 江苏物联网研究发展中心 | Queuing length based fully-actuated signal control method with phase jumping function |
Non-Patent Citations (1)
| Title |
|---|
| 过饱和交叉口交通信号控制动态规划优化模型;李瑞敏，唐瑾;《交通运输工程学报》;20151231;第15卷(第6期);第101-109页 * |
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