CN114202933A - Intersection signal control efficiency evaluation method based on intersection electric alarm data - Google Patents
Intersection signal control efficiency evaluation method based on intersection electric alarm data Download PDFInfo
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/065—Traffic control systems for road vehicles by counting the vehicles in a section of the road or in a parking area, i.e. comparing incoming count with outgoing count
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Abstract
The invention discloses an intersection signal control efficiency evaluation method based on intersection electric warning data, and relates to the technical field of intelligent traffic signal optimization. The invention comprises the following steps: calculating the utilization rate of the green light of each phase through the vehicle passing data and the signal control scheme data; quantitatively measuring the matching balance between the green information ratio corresponding to each steering of the intersection and the flow; calculating the saturation of the intersection to quantitatively measure the matching degree between the overall green light time and the actual intersection requirement of the intersection; different weights are designed for each index to quantitatively measure intersection signal timing efficiency. According to the intersection signal efficiency evaluation method, a set of intersection diagnosis and evaluation model is established through intersection electric alarm data, intersection signal control scheme data and corresponding real-time state data, and finally a most direct intersection signal efficiency evaluation index is output to comprehensively evaluate the intersection signal control effect, so that the intersection signal efficiency index is simplified uniformly, and the intersection signal evaluation accuracy is improved.
Description
Technical Field
The invention belongs to the technical field of intelligent traffic signal optimization, and particularly relates to an intersection signal control efficiency evaluation method based on intersection electric warning data.
Background
The signal optimization is closely related to the diagnosis and evaluation of the intersection, the traffic signal control is the most direct channel for adjusting urban traffic, and the scientific and reasonable signal control scheme can effectively improve the traffic operation efficiency and is the most economical and practical blockage relieving measure. The 2016 ministry of public security publishes an 'intelligent working scheme for promoting urban road traffic signal timing', and further promotes the improvement and optimization work of traffic signal control all over the country. The invention designs the comprehensive evaluation index of the intersection by combining various comprehensive indexes of the intersection, combining data and video, continuously analyzing and summarizing, and diagnosing and evaluating the road condition and the signal control effect of the intersection in a concise way.
Disclosure of Invention
The invention aims to provide an intersection signal control efficiency evaluation method based on intersection electric alarm data, which establishes a set of intersection diagnosis and evaluation model through the intersection electric alarm data, the intersection signal control scheme data and the corresponding real-time state data, and finally outputs a most direct intersection signal efficiency evaluation index to comprehensively evaluate the intersection signal control effect, thereby solving the problems of excessive and over-dispersed intersection evaluation indexes of the existing intersections.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to an intersection signal control efficiency evaluation method based on intersection electric alarm data, which comprises the following steps:
step S1: calculating the red light starting time and the green light starting time of each lane at the intersection by using vehicle passing data and signal control scheme data accurate to millisecond level, then counting the number of vehicles passing in each green light phase on each lane, and further calculating the green light utilization rate of each phase;
step S2: defining an intersection saturation degree balance coefficient index to quantitatively measure the matching balance between the green information ratio and the flow of each steering corresponding to the intersection;
step S3: calculating the saturation X of the intersectioncThe matching degree between the overall green light time and the actual intersection requirement of the intersection is quantitatively measured;
step S4: based on green light utilization rate U and intersection saturation balance coefficient SbAnd intersection saturation XcDifferent weights are designed for each index to quantitatively measure the efficiency of intersection signal timing.
As a preferable technical solution, in the step S1, the green light utilization rate indicates a ratio of a green light time when the vehicle passes through the stop line to a total time of the street lamps obtained by the steering in a time interval, that is:
in the formula ,tBy usingIndicating the time length of the street lamp required by the vehicle of each lane to pass in the time; t is tGreenIndicating the total green light duration acquired by the steering in the period of time;
wherein ,
in the formula ,
representing the average passing number of the steered lanes in the time period;
representing the average headway;
street lamp capable of representing primary phaseTime; n represents the number of green light delivery times over a period of time.
As a preferable technical solution, in the step S2, the intersection saturation equalization coefficient SbThe variance of the traffic signal control intersection turning saturation and the intersection saturation is represented by the following calculation formula:
in the formula ,XiRepresenting real-time saturation over a period of time for a turn; m represents the number of turns at the intersection; xCRepresenting the real-time average saturation of the intersection within a period of time;
the intersection saturation degree equalization coefficient index is a numerical value establishment equal proportional relation between an intersection saturation degree equalization coefficient and an index value [0,10 ]; the proportional relationship is as follows:
if the intersection saturation degree equalization coefficient range is (0, 0.01), the intersection saturation degree equalization coefficient index is (0, 2);
if the intersection saturation degree equalization coefficient range is (0.01, 0.04), the intersection saturation degree equalization coefficient index is (2, 5);
if the intersection saturation degree equalization coefficient range is (0.04, 0.125), the intersection saturation degree equalization coefficient index is (5, 8);
and if the intersection saturation equalization coefficient is larger than 0.125, the intersection saturation equalization coefficient index is (8, 10).
As a preferred technical solution, said XiDividing the sum of the flow of the ith steering all lanes by the traffic capacity of the steering all lanes, wherein the specific formula is as follows:
in the formula, the real-time hourly flow of all lanes of the steering is obtained by converting the current time period flow of each lane into the hourly flow.
As a preferable technical means, the aboveIn step S3, the intersection saturation XcCalculating the average inlet saturation by adopting flow weighting, wherein the specific calculation formula is as follows:
in the formula ,XiSaturation for each entrance; qiThe flow rate of each inlet port; n is the number of branches of the intersection.
As a preferable technical solution, in the step S4, the index includes a green light utilization rate U and an intersection saturation balance coefficient SbAnd intersection saturation XcThe values of the three indexes are normalized into an intersection green light utilization rate index U*Average saturation index at intersection
Intersection saturation balance coefficient index
Then, the signal efficiency index E is obtained by averaging:
wherein E represents the intersection signal efficiency index, U*Indicating an intersection green light interest rate index;
representing the average saturation of the intersection;
representing an intersection saturation balance coefficient index;
the value range of the signal efficiency index E is [0,10], and the evaluation relationship between the index and the intersection signal efficiency is as follows:
if the value range of the signal efficiency index is [0,2], indicating that the signal efficiency grade is high in efficiency;
if the value range of the signal efficiency index is (2,5), indicating that the signal efficiency grade is general efficiency;
if the value range of the signal efficiency index is (5, 7), indicating that the signal efficiency grade is low in efficiency;
if the value range of the signal efficiency index is (7, 10), the signal efficiency grade is extremely low in efficiency.
The invention has the following beneficial effects:
according to the intersection signal efficiency evaluation method, a set of intersection diagnosis and evaluation model is established through intersection electric alarm data, intersection signal control scheme data and corresponding real-time state data, and finally a most direct intersection signal efficiency evaluation index is output to comprehensively evaluate the intersection signal control effect, so that the intersection signal efficiency index is simplified uniformly, and the intersection signal evaluation accuracy is improved.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flow chart of an intersection signal control efficiency evaluation method based on intersection electric alarm data according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention is a method for evaluating intersection signal control efficiency based on intersection electric alarm data, comprising the following steps:
step S1: calculating the red light starting time and the green light starting time of each lane at the intersection by using vehicle passing data and signal control scheme data accurate to millisecond level, then counting the number of vehicles passing in each green light phase on each lane, and further calculating the green light utilization rate of each phase;
step S2: defining an intersection saturation degree balance coefficient index to quantitatively measure the matching balance between the green information ratio and the flow of each steering corresponding to the intersection;
step S3: calculating the saturation X of the intersectioncThe matching degree between the overall green light time and the actual intersection requirement of the intersection is quantitatively measured;
step S4: based on green light utilization rate U and intersection saturation balance coefficient SbAnd intersection saturation XcDifferent weights are designed for each index to quantitatively measure the efficiency of intersection signal timing.
In step S1, the green light utilization rate indicates that, within 15min, the green light time when the vehicle passes through the stop line accounts for the proportion of the total time of the street lamp acquired by the steering within the time interval, that is:
in the formula ,tBy usingIndicating the street lamp time length required by the vehicle to pass through each lane within 15min, wherein the unit is second; t is tGreenRepresenting the total green light duration acquired by the steering within the current 15 min;
wherein ,
in the formula ,
represents the average number of vehicles passing through the lane steered in 15minAn amount;
representing the average headway;
a street light time representing a primary phase; n represents the number of green light delivery times over a period of time.
In step S2, the intersection saturation equalization coefficient SbThe variance of the traffic signal control intersection turning saturation and the intersection saturation is represented by the following calculation formula:
in the formula ,XiRepresenting real-time saturation over a period of time for a turn; m represents the number of turns at the intersection; xCRepresenting the average saturation of the intersection in 15min in real time and the saturation equilibrium coefficient S of the intersectionbThe matching degree of the intersection control scheme and the traffic flow distribution characteristics is reflected, and the smaller the value of the intersection control scheme is, the better the intersection control scheme is;
the intersection saturation balance coefficient index is a value establishing equal proportional relation between the intersection saturation balance coefficient and the index value [0,10 ]; the proportional relationship is as follows:
as described in table 1 below, if the intersection saturation equalization coefficient range is (0,0.01], the intersection saturation equalization coefficient index is (0, 2);
if the intersection saturation degree equalization coefficient range is (0.01, 0.04), the intersection saturation degree equalization coefficient index is (2, 5);
if the intersection saturation degree equalization coefficient range is (0.04, 0.125), the intersection saturation degree equalization coefficient index is (5, 8);
and if the intersection saturation equalization coefficient is larger than 0.125, the intersection saturation equalization coefficient index is (8, 10).
| Saturation equalization coefficient | (0,0.01] | (0.01,0.04] | (0.04,0.125] | >0.125 |
| Index of refraction | (0,2) | (2,5) | (5,8) | (8,10) |
TABLE 1 table of equal proportional relationship between saturation balance coefficient and index value
wherein ,XiDividing the sum of the flow of the ith steering all lanes by the traffic capacity of the steering all lanes, wherein the specific formula is as follows:
in the formula, the real-time hourly flow of all lanes of the steering is obtained by converting the current 15min flow of each lane into the hourly flow.
As shown in table 2 below, in step S3, the intersection saturation reflects the degree of balance between all phases of traffic supply and demand; the real-time intersection saturation of the intersection is saturation data calculated based on 15min traffic data of the intersection, and the intersection saturation XcCalculating the average inlet saturation by adopting flow weighting, wherein the specific calculation formula is as follows:
in the formula ,XiSaturation for each entrance; qiThe flow rate of each inlet port; n is the number of branches of the intersection, and if the road conditions of the three branches are satisfied, n is 3; at a four-way intersection, n is 4.
| Range of saturation | [0,0.5] | (0.5,0.85] | (0.85,1.0] | >1.0 |
| State of saturation | Undersaturation | Moderate saturation | Severe saturation | Oversaturation |
TABLE 2 table of correspondence between saturation range and saturation state
In the following table 3, in step S4, the indexes include the green light utilization rate U and the intersection saturation balance coefficient SbAnd intersection saturation XcThe values of the three indexes are normalized into an intersection green light utilization rate index U*Average saturation index at intersection
Crossing saturation balance coefficientIndex of refraction
Then, the signal efficiency index E is obtained by averaging:
wherein E represents the intersection signal efficiency index, U*Indicating an intersection green light interest rate index;
representing the average saturation of the intersection;
representing an intersection saturation balance coefficient index;
the value range of the signal efficiency index E is [0,10], and the evaluation relationship between the index and the intersection signal efficiency is as follows:
if the value range of the signal efficiency index is [0,2], indicating that the signal efficiency grade is high in efficiency;
if the value range of the signal efficiency index is (2,5), indicating that the signal efficiency grade is general efficiency;
if the value range of the signal efficiency index is (5, 7), indicating that the signal efficiency grade is low in efficiency;
if the value range of the signal efficiency index is (7, 10), the signal efficiency grade is extremely low in efficiency.
| Index of signal efficiency | [0,2] | (2,5] | (5,7] | (7,10] |
| Signal efficiency level | High efficiency | Efficiency is general | Low efficiency | Very low efficiency |
TABLE 3 corresponding relationship table between index and crossing signal efficiency evaluation relationship
It should be noted that, in the above system embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
In addition, it is understood by those skilled in the art that all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing associated hardware, and the corresponding program may be stored in a computer-readable storage medium.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (6)
1. A crossing signal control efficiency evaluation method based on crossing electric alarm data is characterized by comprising the following steps:
step S1: calculating the red light starting time and the green light starting time of each lane at the intersection by using vehicle passing data and signal control scheme data accurate to millisecond level, then counting the number of vehicles passing in each green light phase on each lane, and further calculating the green light utilization rate of each phase;
step S2: defining an intersection saturation degree balance coefficient index to quantitatively measure the matching balance between the green information ratio and the flow of each steering corresponding to the intersection;
step S3: calculating the saturation X of the intersectioncThe matching degree between the overall green light time and the actual intersection requirement of the intersection is quantitatively measured;
step S4: based on green light utilization rate U and intersection saturation balance coefficient SbAnd intersection saturation XcDifferent weights are designed for each index to quantitatively measure the efficiency of intersection signal timing.
2. The method as claimed in claim 1, wherein in step S1, the green light utilization rate indicates a ratio of a green light time when the vehicle passes through a stop line to a total street light time obtained by the steering in a time interval, that is:
in the formula ,tBy usingIndicating the time length of the street lamp required by the vehicle of each lane to pass in the time; t is tGreenIndicating the total green light duration acquired by the steering in the period of time;
wherein ,
in the formula ,
representing the average passing number of the steered lanes in the time period;
representing the average headway;
a street light time representing a primary phase; n represents the number of green light delivery times over a period of time.
3. The method for evaluating the intersection signal control efficiency based on the intersection electric alarm data according to claim 1, wherein in the step S2, an intersection saturation degree balance coefficient SbThe variance of the traffic signal control intersection turning saturation and the intersection saturation is represented by the following calculation formula:
in the formula ,XiRepresenting real-time saturation over a period of time for a turn; m represents the number of turns at the intersection; xCRepresenting the real-time average saturation of the intersection within a period of time;
the intersection saturation degree equalization coefficient index is a numerical value establishment equal proportional relation between an intersection saturation degree equalization coefficient and an index value [0,10 ]; the proportional relationship is as follows:
if the intersection saturation degree equalization coefficient range is (0, 0.01), the intersection saturation degree equalization coefficient index is (0, 2);
if the intersection saturation degree equalization coefficient range is (0.01, 0.04), the intersection saturation degree equalization coefficient index is (2, 5);
if the intersection saturation degree equalization coefficient range is (0.04, 0.125), the intersection saturation degree equalization coefficient index is (5, 8);
and if the intersection saturation equalization coefficient is larger than 0.125, the intersection saturation equalization coefficient index is (8, 10).
4. The intersection signal control efficiency evaluation method based on intersection electric alarm data as claimed in claim 3, wherein X isiDividing the sum of the flow of the ith steering all lanes by the traffic capacity of the steering all lanes, wherein the specific formula is as follows:
in the formula, the real-time hourly flow of all lanes of the steering is obtained by converting the current time period flow of each lane into the hourly flow.
5. The method for evaluating the efficiency of controlling intersection signals based on the electrical alarm data at the intersection as claimed in claim 1, wherein in the step S3, the saturation X of the intersection iscCalculating the average inlet saturation by adopting flow weighting, wherein the specific calculation formula is as follows:
in the formula ,XiSaturation for each entrance; qiThe flow rate of each inlet port; n is the number of branches of the intersection.
6. The method for evaluating the intersection signal control efficiency based on the intersection electric warning data as claimed in claim 1, wherein the indicators in the step S4 include a green light utilization rate U and an intersection saturation balance coefficient SbAnd intersection saturation XcThe values of the three indexes are normalized into an intersection green light utilization rate index U*Average saturation index at intersection
Intersection saturation balance coefficient index
Then, the signal efficiency index E is obtained by averaging:
wherein E represents the intersection signal efficiency index, U*Indicating an intersection green light interest rate index;
representing the average saturation of the intersection;
representing an intersection saturation balance coefficient index;
the value range of the signal efficiency index E is [0,10], and the evaluation relationship between the index and the intersection signal efficiency is as follows:
if the value range of the signal efficiency index is [0,2], indicating that the signal efficiency grade is high in efficiency;
if the value range of the signal efficiency index is (2,5), indicating that the signal efficiency grade is general efficiency;
if the value range of the signal efficiency index is (5, 7), indicating that the signal efficiency grade is low in efficiency;
if the value range of the signal efficiency index is (7, 10), the signal efficiency grade is extremely low in efficiency.
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