CN105679032B - A kind of traffic control sub-area division method under urban traffic flow hypersaturated state - Google Patents
A kind of traffic control sub-area division method under urban traffic flow hypersaturated state Download PDFInfo
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- CN105679032B CN105679032B CN201610171594.1A CN201610171594A CN105679032B CN 105679032 B CN105679032 B CN 105679032B CN 201610171594 A CN201610171594 A CN 201610171594A CN 105679032 B CN105679032 B CN 105679032B
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- 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
- G08G1/0125—Traffic data processing
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Abstract
The present invention relates to a kind of traffic control sub-area division methods under urban traffic flow hypersaturated state, for under the road network hypersaturated state of large-scale city the characteristics of traffic flow, with reference to urban traffic blocking formation mechenism, realize that the crossing similar to prevailing state in road network carries out sub-area division.According to continually changing traffic flow under hypersaturated state, carry out dynamic and divide, reliable basic condition is provided for the realization of signal control algolithm under hypersaturated state；According to the real-time detector data in each crossing and section in road network, automatic identification crossing and road congestion state, then supersaturated sub-district is divided with the congestion status dynamic in crossing, section.The present invention can carry out city supersaturation road network effective sub-area division, and the automatic and dynamic in real time supersaturated sub-area division effect supersaturated sub-area division single better than tradition provides effective division methods to road network under the hypersaturated state of city.
Description
Technical Field
The invention relates to the field of intelligent traffic, in particular to a method for dividing traffic control subareas in an oversaturated urban traffic flow state.
Background
With the development of urban economy, the quantity of motor vehicles kept is in a state of rapid increase, and urban roads grow limitedly and slowly, so that normal traffic traveling of cities is seriously hindered, traffic jam frequently occurs, the transportation efficiency of vehicles is remarkably reduced, normal traveling of urban residents is influenced, and the development of economy is restricted. Especially in large cities, oversaturated traffic congestion has become a norm. The problems of oversaturated traffic congestion, and the accompanying environmental pollution and energy shortage have become significant problems affecting the urban development and the citizen living standard.
As an extremely important means of modern urban traffic management, the quality of urban road traffic signal control design optimization determines whether urban road vehicles are dredged or not to a great extent. However, the passing efficiency of the vehicle in the oversaturated traffic state is extremely low, and the energy consumption is extremely high. Therefore, the signal control under the designed urban supersaturated traffic state is the key point for controlling urban traffic.
In a complex urban road network in an oversaturated traffic state, different areas in the area covered by the road network have different traffic characteristics (including traffic mode composition, traffic volume, flow direction and the like), and it is very difficult to carry out overall coordination on the complex urban road network, because general road network coordination control needs uniform signal control time, and it is unrealistic to make the signal cycle time of all intersections in a city equal or in a multiple relation. Therefore, the control range needs to be divided into different control areas, and each control area is designed with a corresponding control scheme according to the traffic flow characteristics of the control area, namely, the control subareas need to be divided in an oversaturated state.
As the premise of the signal coordination control in the oversaturated traffic state, the method for dividing the subareas in the oversaturated traffic state has the following characteristics: 1. if the adjacent intersections have similar traffic properties, the adjacent intersections are divided into the same control subarea so as to ensure the continuity of traffic flow operation. 2. Whether the adjacent intersections are divided into the same control subarea or not is needed to be judged to be helpful for the evacuation of the supersaturated flow; 3. intersections with lower saturation are added into the supersaturation control subarea so that the saturated traffic flow can be released quickly and stably continuously to relieve the supersaturation traffic state.
1) The SCATS system takes a sub-system form as a minimum coordination unit to carry out self-adaptive control, the concept of the sub-system is that the sub-system is a sub-area, when the traffic flow changes, the sub-area is readjusted according to the traffic conditions of each intersection and the correlation between the traffic conditions and the intersection, the requirement is provided for the definition of a control structure range according to a supersaturation control strategy, and the university of the same society Yang Xiaoguang starts from the judgment of a supersaturation road section, establishes and verifies a correlation calculation model by taking the correlation between intersections as a quantitative index, and provides a dynamic division method of a traffic control cell in a supersaturation state by defining a blocking area, a transition area, a normal area and a dissipation area. However, the above research does not consider the identification of the oversaturated state of the intersection in time, and the congestion is diffused from point to line to surface, so that the partitioning effect is influenced.
Disclosure of Invention
The invention aims to overcome the defects and provides a method for dividing traffic control subareas in an oversaturated urban traffic flow state, which automatically identifies the congestion levels of intersections and road sections according to the real-time detection data of the intersections and the road sections in a road network and dynamically divides the oversaturated subareas according to the congestion levels of the intersections and the road sections; the supersaturated intersection can be timely and accurately identified and the sub-areas can be dynamically divided, so that the signal control efficiency under the supersaturated traffic state can be improved.
The invention achieves the aim through the following technical scheme: a method for dividing traffic control subareas in an urban traffic flow oversaturation state comprises the following steps:
(1) Calculating the main flow direction saturation in each phase of the single intersection and the queue ratio of each phase to the upstream road section according to the real-time detection data of the intersection and the road section;
(2) Calculating to obtain road congestion degree by using the queuing ratio of each phase mainly flowing to an upstream road;
(3) Judging whether the main flow direction saturation of each phase of the single intersection and the queuing ratio of the upstream road section reach respective thresholds or not, and if so, taking the intersection as a subregion division starting point; otherwise, ending; wherein the threshold is preset;
(4) Judging the real-time road section congestion degree of the road section connected with the sub-area division starting point intersection, if the real-time road section congestion degree reaches a threshold value, adding the road section and the intersections connected with the two ends of the road section into the sub-area, taking out the intersections newly added into the sub-area, and executing the next step; if no connected road section reaching the threshold value exists, the sub-area division is finished, and the intersection is divided into one sub-area; wherein the threshold is preset;
(5) Sequentially taking one or more intersections newly joining the subarea as starting points of subarea extension, extracting the real-time road congestion degree of a road section connected with the intersections, joining the road section and the intersections connected with the road section into the subarea if the real-time congestion degree of the road section exceeds a threshold value, taking out the intersections newly joining the subarea, and entering the step (6); if the road sections do not reach the threshold value, the diffusion of the sub-area is terminated, and the sub-area division is finished; wherein the threshold is preset;
(6) And (5) repeatedly executing the step until the sub-area division is finished.
Preferably, the formula for calculating the main flow direction saturation in each phase of the single intersection in the step (1) is as follows:
wherein x is i,j Saturation of the main flow direction j for phase i; q. q.s i,j The traffic flow arriving at the stop line in the main flow direction j of the phase i is in PCU/h; c i The traffic capacity of the phase i is shown in PCU/h; lambda [ alpha ] i The split is the split of phase i; s i Is the saturation flow for phase i, in PCU/h.
Preferably, the calculation formula of the queuing ratio of each phase flowing mainly to the upstream road section in step (1) is as follows:
wherein L is the queue length of the upstream road section after the phase green light is finished and the phase is mainly flowed, L R Is the length of the road segment.
Preferably, the definition and calculation formula of the link congestion degree in the step (2) are as follows:
C＝max(l 1 ，l 2 )
wherein C is the road congestion degree between two adjacent intersections, l 1 And l 2 The queuing ratios in the uplink direction and the downlink direction of the road section are respectively; l is 1 And L 2 Queuing lengths in the two directions of ascending and descending of the road section after the phase green light is finished are respectively set; l is R1 And L R2 The lengths of the road sections in the uplink direction and the downlink direction are respectively.
The invention has the beneficial effects that: (1) The method can accurately identify the oversaturated intersection in time and dynamically divide the subareas, and is favorable for improving the signal control efficiency in the oversaturated traffic state; (2) The urban supersaturated road network can be effectively divided into sub-areas, and the multi-class supersaturated sub-area division effect is superior to that of the traditional single supersaturated sub-area division.
Drawings
Fig. 1 is a schematic diagram of a city road network in the embodiment of the present invention.
Detailed Description
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto:
the embodiment is as follows: as shown in fig. 1, an urban road network has 12 intersections, each intersection and road segment having a real-time detection device for detecting the respective required traffic volume: the flow direction of each flow direction at the intersection, the queuing length of the vehicles and the green signal ratio of the intersection. There are two main flows (there may be only one) between any two intersections, and each of the two main flows is recorded as a road segment, and each road segment has a real-time congestion degree. Assuming that a plurality of intersections among the 12 intersections reach an oversaturated traffic state, a specific determination method is as follows 1), where intersection a is one of the intersections, the congestion degree of the links represented by AB, BC, AD, DE, and EF exceeds a threshold, and the congestion degree of other links in the road network does not exceed the threshold. In the following steps, it is assumed that the subareas are divided from the intersection a.
A method for dividing traffic control subareas in an oversaturated urban traffic flow state comprises the following steps: according to real-time traffic conditions, the main flow direction saturation of intersection phases and the queuing ratio of connected road sections are dynamically calculated, the intersection reaching the saturation state is identified through the calculation of the two indexes, and then the sub-areas are divided by combining the congestion degree of the road sections, and the steps are as follows:
1) And identifying the oversaturated traffic state of the single intersection by defining and calculating the flow direction saturation and the queue ratio of the road sections:
firstly, calculating the main flow direction saturation in each phase of a single intersection:
the formula for calculating the main flow direction saturation in each phase of the single intersection in the step (1) is as follows:
wherein x is i,j Saturation of the main flow direction j for phase i; q. q of i,j The traffic flow reaching the stop line in the main flow direction j of the phase i is in PCU/h; c i The traffic capacity of the phase i is shown in PCU/h; lambda [ alpha ] i Is the split of phase i; s i The unit is PCU/h for the saturated flow of phase i.
Then, calculating the queuing ratio of each phase mainly flowing to an upstream road section:
in the formula: l is the queue length of the upstream road section with the main phase flow after the phase green light is finished, L R Is the length of the road segment.
Can judge that: when x is i,j When the flow rate is large, the traffic flow rate in the flow direction is considered to be large. When x is i,j Above a threshold, a saturation condition may be considered to be reached. When x is i,j When the traffic flow is small, two situations may occur, namely, the traffic flow is originally small, and the intersection reaches an oversaturated traffic state to cause low traffic flow divergence, so that the queuing condition of vehicles needs to be assistedThe condition is dialectical, i.e. when x i,j Less than a certain threshold, e.g. x i,j &0.3, the queuing ratio l of the upstream road section corresponding to the main flow direction j is also selected, if the queuing ratio is greater than a certain threshold value, such as l>, 0.1, it can be determined that the flow direction is already in an oversaturated state.
2) Defining and calculating the congestion degree of the road section:
C＝max(l 1 ,l 2 )
in the formula: c is the degree of congestion of the road section between two adjacent intersections, l 1 And l 2 The queuing ratios in the uplink direction and the downlink direction of the road section are respectively.
3) And (3) division of sub-regions:
step1, identifying the traffic states of all intersections in the specified road network according to the single intersection traffic state identification method, and putting all the intersections reaching the oversaturation state into a set M k In (1). Let i = j = k =0;
step2 in set M k In any crossing (not marked as m) k ) As a starting point for the division of a single subregion;
step3, mixing k Putting a set A into the intersection i Record a i,s Is A i The middle s crossing element;
step 4. Get intersection a i,s The traffic congestion degree l of the connected road sections sequentially judges whether the congestion degree of each road section exceeds an exact congestion degree threshold value l omax Is prepared by>l omax Putting the set B into the intersections connected with the road sections;
step5, judging whether A is present or not i All intersections in the road are processed by Step4, if not, the road enters Step6, and if the road exists, the road enters Step7;
step6, let s = s +1, return to Step4;
step7, judging whether i is present>, 0, if yes, making the set C = B-A i ∪A i-1 If not, let C = B-A i ；
And Step8, judging whether the set C is empty, and if not, carrying out the next Step. If the state is empty, entering Step10;
step9, letting i = i +1, putting the road junction in the set C into the set A i Clearing set B, C, returning s =0 to Step4;
step10 order T j ＝A 0 ∪A 1 ∪...A i K = k +1, j = j +1, let M k ＝M k-1 -M k-1 ∩T j-1 ；
Step11: judgment of M k If the state is not null, the operation returns to Step2. If the value is null, the next step is carried out;
and Step12, obtaining a sub-area after the division is finished: t is 1 ,T 2 ...T j 。
By the method, a subarea containing the ABCDEF junction can be finally obtained.
While the invention has been described in connection with specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A method for dividing traffic control subareas in an urban traffic flow oversaturation state is characterized by comprising the following steps of:
(1) Calculating the main flow direction saturation in each phase of the single intersection and the queue ratio of each phase to the upstream road section according to the real-time detection data of the intersection and the road section;
(2) Calculating to obtain road section congestion degree by using the queuing ratio of the main flow of each phase to the upstream road section;
(3) Judging whether the main flow direction saturation and the upstream road section queuing ratio of each phase of the single intersection reach respective thresholds or not, and if so, taking the intersection as a subregion division starting point; otherwise, ending; wherein the threshold is preset;
(4) Judging the real-time road section congestion degree of the road section connected with the sub-area division starting point intersection, if the real-time road section congestion degree reaches a threshold value, adding the road section and the intersections connected with the two ends of the road section into the sub-area, taking out the intersections newly added into the sub-area, and executing the next step; if no connected road section reaching the threshold value exists, the sub-area division is finished, and the intersection is divided into one sub-area; wherein the threshold is preset;
(5) Sequentially taking one or more intersections newly joining the subarea as starting points of subarea extension, extracting the real-time road congestion degree of a road section connected with the intersections, joining the road section and the intersections connected with the road section into the subarea if the real-time congestion degree of the road section exceeds a threshold value, taking out the intersections newly joining the subarea, and entering the step (6); if the road sections do not reach the threshold value, the diffusion of the sub-area is terminated, and the sub-area division is finished; wherein the threshold is preset;
(6) And (5) repeating the step until the division of the subareas is finished.
2. The method for dividing the traffic control subarea in the oversaturated urban traffic flow state according to claim 1, which is characterized in that: the formula for calculating the main flow direction saturation in each phase of the single intersection in the step (1) is as follows:
wherein x is i,j Saturation of the main flow direction j for phase i; q. q.s i,j The traffic flow arriving at the stop line in the main flow direction j of the phase i is in PCU/h; c i The traffic capacity of the phase i is shown in PCU/h; lambda [ alpha ] i Is the split of phase i; s i Is the saturation flow for phase i, in PCU/h.
3. The method for dividing the traffic control subarea in the oversaturated urban traffic flow state according to claim 1, which is characterized in that: the calculation formula of the queuing ratio of each phase mainly flowing to the upstream road section in the step (1) is as follows:
wherein L is the queue length of the upstream road section after the phase green light is finished and the phase is mainly flowed, L R Is the length of the road segment.
4. The method for dividing the traffic control subarea in the oversaturated urban traffic flow state according to claim 1, which is characterized in that: the definition and calculation formula of the road section congestion degree in the step (2) are as follows:
C＝max(l 1 ,l 2 )
wherein C is the road congestion degree between two adjacent intersections, l 1 And l 2 The queuing ratios in the uplink direction and the downlink direction of the road section are respectively; l is a radical of an alcohol 1 And L 2 Queuing lengths in the two directions of ascending and descending of the road section after the phase green light is finished are respectively set; l is R1 And L R2 The lengths of the road sections in the uplink direction and the downlink direction are respectively.
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| CN107067768B (en) * | 2017-04-24 | 2019-08-16 | 河南省城乡规划设计研究总院有限公司 | A kind of city supersaturation traffic flow self-organizing signal control method |
| CN108198412B (en) * | 2017-12-06 | 2020-02-07 | 广东交通职业技术学院 | Supersaturated road network multilayer control boundary dynamic division method based on MFD under Internet of vehicles |
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| CN108335496B (en) * | 2018-01-02 | 2020-07-10 | 青岛海信网络科技股份有限公司 | City-level traffic signal optimization method and system |
| CN108399742B (en) * | 2018-01-30 | 2020-12-15 | 昆明理工大学 | Traffic situation heat map visualization method based on traffic saturation |
| CN108320511B (en) * | 2018-03-30 | 2020-12-29 | 江苏智通交通科技有限公司 | Urban road traffic sub-area dividing method based on spectral clustering |
| CN111564047A (en) * | 2019-02-14 | 2020-08-21 | 阿里巴巴集团控股有限公司 | Signal control area segmentation method and device and electronic equipment |
| CN110889967B (en) * | 2019-11-28 | 2023-11-28 | 北京航空航天大学 | Overflow risk balance signal control optimization method based on main road segmentation |
| CN112289043B (en) * | 2020-10-28 | 2022-10-04 | 上海电科智能系统股份有限公司 | Intelligent signal coordination control optimization method for urban road |
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