CN107945538B - Intelligent traffic signal control method - Google Patents
Intelligent traffic signal control method Download PDFInfo
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- CN107945538B CN107945538B CN201710219493.1A CN201710219493A CN107945538B CN 107945538 B CN107945538 B CN 107945538B CN 201710219493 A CN201710219493 A CN 201710219493A CN 107945538 B CN107945538 B CN 107945538B
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- G08G1/08—Controlling traffic signals according to detected number or speed of vehicles
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Abstract
The intelligent traffic signal control method includes the steps of continuously measuring the number of vehicles passing through each intersection in a corresponding time period, calculating the average value of the number of left-turn vehicles, the number of straight-going vehicles and the number of right-turn vehicles, determining the standard value of the time length of an indicator light control signal in the corresponding time period, controlling a traffic signal indicator light according to the standard value, measuring the number of left-turn vehicles, the number of straight-going vehicles and the number of right-turn vehicles passing through the corresponding intersection in unit time in real time, adjusting the indicator light control signal and the like.
Description
Technical Field
The invention relates to the technical field of intelligent traffic information processing, in particular to an intelligent traffic signal control method.
Background
With the rapid development of social economy and the acceleration of urbanization construction, a large number of vehicles are increased, the number of motor vehicles is increased year by year, and the traffic jam condition of the city is increasingly serious. At present, the problem of serious urban congestion is solved by simply depending on the expansion of urban roads and the traditional signal control, time is consumed, the cost is high, and the effects of relieving traffic congestion and improving traffic operation efficiency are very limited.
In the prior art, an intelligent traffic signal control mode is mostly realized by optimizing and managing traffic signals, for example, by setting a pressure sensor and/or a camera device on a road to record the number of vehicles on the road in real time, so as to adjust the signal lamp time of the traffic signals. However, these methods in the prior art are not suitable for a narrow road, and the measured data is inaccurate, and once data inaccuracy and equipment failure occur, the traffic control signal may be confused, and traffic paralysis may be caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an intelligent traffic signal control method which can quickly measure the passing number and form direction of road vehicles in real time and efficiently and intelligently control traffic signal indicator lamps.
The invention provides an intelligent traffic signal control method, which sequentially comprises the following steps:
(1) the number N of vehicles passing through each intersection within 24 hours and 30 minutes in a week for 7 days is continuously measured by using a detection device arranged at the center of each intersection and a first reflection device and a second reflection device respectively arranged at two sides of a road with a distance from the detection devicei,j＝{Ai,j，Bi,j，Ci,j1, …,48, j 1, …,7, wherein the number of passing vehicles includes the number of left-turning vehicles ai,jNumber of straight-going vehicles Bi,jNumber of right-turning vehicles Ci,j；
(2) The number of left-turn vehicles A corresponding to the time interval each dayi,jNumber of straight-going vehicles Bi,jNumber of right-turning vehicles Ci,jFind the average value, i.e.
Wherein A isi、Bi、CiRespectively representing the average value of the number of left-turning vehicles, the number of straight-going vehicles and the number of right-turning vehicles corresponding to each 30 minutes in 24 hours in each day;
(3) comparing the average values of the number of left-turning vehicles, the number of straight-going vehicles and the number of right-turning vehicles which respectively correspond to each 30 minutes within 24 hours every day, determining a scale factor according to a proportion, and respectively and correspondingly determining the standard value of the time length of the indicator light control signal of the corresponding time period after multiplying the preset traffic signal control time;
(4) controlling the traffic signal indicator light according to the standard value of the indicator light control signal duration of the corresponding time period;
(5) the detection device and the first and second reflection devices are used for measuring the number of left-turn vehicles, the number of straight-going vehicles and the number of right-turn vehicles passing through the corresponding intersection in unit time in real time:
if the number of left-turning vehicles, the number of straight-going vehicles and/or the number of right-turning vehicles in unit time is smaller than a preset threshold range, increasing the unit time length of the indicator light control signal time length of the corresponding time period in the step (4);
if the number of left-turning vehicles, the number of straight-going vehicles and/or the number of right-turning vehicles in unit time is larger than a preset threshold range, reducing the unit time length of the indicator light control signal time length of the corresponding time period in the step (4);
and (4) if the number of left-turning vehicles, the number of straight-going vehicles and/or the number of right-turning vehicles in the unit time belong to a preset threshold range, keeping the time of the indicator light control signal of the corresponding time period in the step (4) unchanged.
Preferably, the preset traffic signal control time is determined based on a desired traffic signal control time.
Preferably, the determination of the desired traffic signal control time is based on the number of vehicles expected to pass within the control period.
Preferably, the number of passing vehicles is determined by transmitting signals to the first and second reflecting means respectively by the detecting means, by judging the return paths of the transmitted signals respectively and by the time.
Preferably, the determination of the number of left-turn vehicles, the number of straight-ahead vehicles and the number of right-turn vehicles is determined by judging a difference between return paths of the first signal and the second signal which are respectively transmitted to the first reflecting device and the second reflecting device by the detecting device.
Preferably, the number of left-turn and right-turn passing vehicles is determined by judging whether the difference between the return paths of the first signal and the second signal is greater than or less than a path difference threshold range, and the number of straight passing vehicles is determined by judging whether the difference between the return paths of the first signal and the second signal belongs to the path difference threshold range.
The intelligent traffic signal control method can realize that:
1) the passing number of the vehicles is determined in a new mode, the driving direction of the vehicles can be judged, the signal indicating lamps can be accurately and intelligently controlled, and the efficiency is improved;
2) the intelligent control signal lamp is suitable for narrow roads, dynamically adjusts the control signal indicator lamp and is more efficient;
3) the measuring equipment has simple structure and low cost;
4) the collected data is enriched and can be used as reserved data for reference research.
Drawings
FIG. 1 is a diagram of an intelligent traffic signal control scenario
FIG. 2 is a diagram of an intelligent traffic signal control scenario
FIG. 3 is an enlarged view of an intelligent traffic signal control scene
FIG. 4 is an enlarged view of an intelligent traffic signal control scene II
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, the following examples of which are intended to be illustrative only and are not to be construed as limiting the scope of the invention.
The invention has provided a intelligent traffic signal control method, as shown in fig. 1 and 2, there are checkout gears in the center of crossing, there are the first, the second reflecting device separately on both sides of road of a distance of checkout gear, utilize checkout gear to transmit the signal to the first, the second reflecting device separately, when there is no vehicle to pass between two reflecting devices, the first transmitted signal that the checkout gear transmits is to the first reflecting device, reach the second reflecting device after the first reflecting device reflects, is received by the checkout gear after the second device reflects, this is the first route; the second emission signal emitted by the detection device is sent to the second reflection device, reflected by the second reflection device, sent to the first reflection device, reflected by the first device and received by the detection device, and the second emission signal is a second path, and if the first signal and the second signal are emitted simultaneously, the return time is the same and the path length is the same. When a vehicle passes through the two reflecting devices, a first transmitting signal transmitted by the detection device is transmitted to the first reflecting device, is directly reflected by the vehicle body after being reflected by the first reflecting device and returns along a first original path, a second transmitting signal transmitted by the detection device is transmitted to the second reflecting device in the same way, is directly reflected by the vehicle body after being reflected by the second reflecting device and also returns along a second original path, if the vehicle happens to be positioned in the center of the road at the moment, the two returning time are the same, the lengths of the first returning path and the second returning path are the same, and the images 3 and 4 are enlarged intersection images Left turn, or right turn.
In addition, the position setting of the detection device and the first and second reflection devices is also important, if the detection device is set too low, the vehicle can block echo signals during running, so the setting height of the detection device is set to be 4m, and the setting height of the first and second reflection devices is 0.5m, so that the measurement according to a preset path can be realized through calibration.
Each intersection is provided with a hardware configuration similar to that shown in fig. 1 and 2, and in the actual control process, first, the number N of vehicles passing through each intersection for every 30 minutes for 7 days (monday to sunday) and 24 hours is continuously measuredi,j＝{Ai,j，Bi,j，Ci,j1, …,48, j 1, …,7, wherein the number of passing vehicles includes the number of left-turning vehicles ai,jNumber of straight-going vehicles Bi,jNumber of right-turning vehicles Ci,jThus, the vehicle passing number of each time period in each week can be obtained. Then, the number of left-turn vehicles A for the corresponding time period per day is respectively seti,jNumber of straight-going vehicles Bi,jNumber of right-turning vehicles Ci,jFind the average value, i.e.
Within 24 hours of each day after statistics is obtained, after the average value of the number of left-turn vehicles, the number of straight-going vehicles and the number of right-turn vehicles corresponding to each 30 minutes is obtained, the standard value of the time length of the indicator light control signal corresponding to each time period can be determined, the determination of the standard value is set based on the rule of the existing traffic signal indicator light, and is determined only according to the control time length of the indicator light, for example, the left-turn traffic signal light and the straight-going traffic signal light of the opposite intersection can be determined to be turned on within the same time period, and the right-turn indicator light is turned on all the time or the corresponding time period is turned on. The arrangement mode avoids that the signal indicator lamp is always executed according to a fixed control signal, effectively improves the efficiency, and can meet the requirement that the traffic is allocated according to the efficient configuration control signal when the number of vehicles passing in a certain direction is increased or reduced in a certain period. Specifically, the average values of the number of left-turn vehicles, the number of straight-going vehicles and the number of right-turn vehicles which correspond to each other every 30 minutes in 24 hours every day can be compared, a proportional factor is determined according to a proportion, and the proportional factor is multiplied by preset traffic signal control time and then is correspondingly determined as a standard value of the time length of the indicator light control signal of the corresponding time period.
Then, comparing the average values of the number of left-turning vehicles, the number of straight-going vehicles and the number of right-turning vehicles which respectively correspond to each 30 minutes within 24 hours every day, determining a scale factor according to a proportion, and respectively and correspondingly determining a standard value of the time length of the indicator light control signal of the corresponding time period after multiplying the preset traffic signal control time;
then, controlling the traffic signal indicator lamp according to the standard value of the indicator lamp control signal duration of the corresponding time period;
finally, although traffic control is performed according to the traffic flow in the corresponding time period of each day, the traffic condition in the corresponding time period of each day also changes, and in order to adapt to the change, traffic signals are controlled more intelligently, and the efficiency is improved, the number of left-turn vehicles, the number of straight-going vehicles and the number of right-turn vehicles passing through the corresponding intersection in unit time can be measured in real time by using the detection device and the first and second reflection devices:
if the number of left-turning vehicles, the number of straight-going vehicles and/or the number of right-turning vehicles in unit time is smaller than a preset threshold range, increasing the unit time length of the indicator light control signal time length of the corresponding time period in the step (4);
if the number of left-turning vehicles, the number of straight-going vehicles and/or the number of right-turning vehicles in unit time is larger than a preset threshold range, reducing the unit time length of the indicator light control signal time length of the corresponding time period in the step (4);
and (4) if the number of left-turning vehicles, the number of straight-going vehicles and/or the number of right-turning vehicles in the unit time belong to a preset threshold range, keeping the time of the indicator light control signal of the corresponding time period in the step (4) unchanged.
Although exemplary embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions, substitutions and the like can be made in form and detail without departing from the scope and spirit of the invention as disclosed in the accompanying claims, all of which are intended to fall within the scope of the claims, and that various steps in the various sections and methods of the claimed product can be combined together in any combination. Therefore, the description of the embodiments disclosed in the present invention is not intended to limit the scope of the present invention, but to describe the present invention. Accordingly, the scope of the present invention is not limited by the above embodiments, but is defined by the claims or their equivalents.
Claims (4)
1. An intelligent traffic signal control method is characterized by sequentially comprising the following steps:
(1) the number N of vehicles passing through each intersection within 24 hours and 30 minutes in a week for 7 days is continuously measured by using a detection device arranged at the center of each intersection and a first reflection device and a second reflection device respectively arranged at two sides of a road with a distance from the detection devicei,j＝{Ai,j，Bi,j，Ci,j1, …,48, j 1, …,7, wherein the number of passing vehicles includes the number of left-turning vehicles ai,jNumber of straight-going vehicles Bi,jNumber of right-turning vehicles Ci,j；
(2) The number of left-turn vehicles A corresponding to the time interval each dayi,jNumber of straight-going vehicles Bi,jNumber of right-turning vehicles Ci,jFind the average value, i.e.
Wherein A isi、Bi、CiRespectively representing the average value of the number of left-turning vehicles, the number of straight-going vehicles and the number of right-turning vehicles corresponding to each 30 minutes in 24 hours in each day;
(3) comparing the average values of the number of left-turning vehicles, the number of straight-going vehicles and the number of right-turning vehicles which respectively correspond to each 30 minutes within 24 hours every day, determining a scale factor according to a proportion, and respectively and correspondingly determining the standard value of the time length of the indicator light control signal of the corresponding time period after multiplying the preset traffic signal control time;
(4) controlling the traffic signal indicator light according to the standard value of the indicator light control signal duration of the corresponding time period;
(5) the detection device and the first and second reflection devices are used for measuring the number of left-turn vehicles, the number of straight-going vehicles and the number of right-turn vehicles passing through the corresponding intersection in unit time in real time:
if the number of left-turning vehicles, the number of straight-going vehicles and/or the number of right-turning vehicles in unit time is smaller than a preset threshold range, increasing unit time length for the standard value of the indicator light control signal time length in the corresponding time period in the step (4);
if the number of left-turning vehicles, the number of straight-going vehicles and/or the number of right-turning vehicles in unit time is larger than a preset threshold range, reducing the unit time length of the standard value of the indicator light control signal time length in the corresponding time period in the step (4);
if the number of left-turning vehicles, the number of straight-going vehicles and/or the number of right-turning vehicles in unit time belong to a preset threshold range, keeping the standard value of the duration of the indicator light control signal in the corresponding time period in the step (4) unchanged;
the number of left-turn vehicles, the number of straight-going vehicles and the number of right-turn vehicles which pass through are determined by judging the difference between return paths of a first signal and a second signal which are respectively transmitted to the first reflecting device and the second reflecting device by the detection device.
2. The method of claim 1, wherein: the preset traffic signal control time is determined based on a desired traffic signal control time.
3. The method of claim 2, wherein: the determination of the desired traffic signal control time is based on the number of vehicles expected to pass within the control time period.
4. The method of claim 1, wherein: the number of left-turn and right-turn passing vehicles is determined by judging whether the difference between the return paths of the first signal and the second signal is greater than or less than a path difference threshold range, and the number of straight-going passing vehicles is determined by judging whether the difference between the return paths of the first signal and the second signal belongs to the path difference threshold range.
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| CN110136454B (en) * | 2019-06-17 | 2021-06-29 | 公安部交通管理科学研究所 | Urban traffic trunk line dynamic green wave signal control system and method based on real-time traffic flow data |
| CN115527382B (en) * | 2022-09-08 | 2023-04-18 | 安徽交控信息产业有限公司 | Traffic control method based on intelligent multi-objective optimization algorithm |
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