CN107123266B - Bottleneck road section traffic flow adjusting method and device based on traffic big data - Google Patents
Bottleneck road section traffic flow adjusting method and device based on traffic big data Download PDFInfo
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Abstract
The embodiment of the invention provides a bottleneck road section traffic flow adjusting method and device based on traffic big data, wherein the method comprises the steps of obtaining the driving-in flow, the driving-out flow and the vehicle queuing length of a bottleneck road section, then determining the total adjusting quantity of the bottleneck road section according to the driving-in flow, the driving-out flow and the vehicle queuing length of the bottleneck road section, and distributing the total adjusting quantity of the bottleneck road section to each adjusting road section according to the driving-in flow and the driving-out flow of the bottleneck road section. And finally, regulating the traffic flow of the bottleneck road section according to the traffic phase parameter of the regulating road section. In the embodiment of the invention, the traffic flow of the adjusting road sections on the upper and lower sides of the bottleneck road section is fully utilized to evacuate, and the efficiency of adjusting the traffic flow of the bottleneck road section is improved. In addition, the adjustment amount is distributed to the adjustment road section according to the residual capacity of the adjustment road section, so that a new traffic jam point is avoided in the process of adjusting the traffic flow of the bottleneck road section.
Description
Technical Field
The embodiment of the invention relates to the technical field of traffic, in particular to a method and a device for regulating traffic flow of a bottleneck road section based on traffic big data.
Background
With the continuous increase of the quantity of motor vehicles kept in cities, the number of vehicles in transit in the road network in the morning and evening peaks is also increased. In a hot area of vehicle traveling, a bottleneck phenomenon often occurs on a part of road sections, the traffic capacity of intersections on the upstream and downstream of the bottleneck road sections is seriously hindered, and serious regional traffic jam is caused. In order to solve the problem of bottleneck blockage of the road section, a large amount of research is carried out by relevant scholars at home and abroad, and the main measure is to cut off the main traffic flow entering the bottleneck road section when the road section triggers the bottleneck, so that the traffic pressure of the bottleneck road section is relieved. The control method does not fully utilize the traffic capacity of the upstream and downstream of the bottleneck road section, so the control effect is not obvious, and in addition, the bearing capacity of the road section flowing to the related intersection is not considered in the control process, so that other surrounding road sections are often triggered to be bottlenecked, new traffic jam points are caused, and the normal traffic order is disturbed.
Disclosure of Invention
The embodiment of the invention provides a method and a device for regulating traffic flow of a bottleneck road section based on traffic big data, which are used for solving the problems that the control effect of the existing control method is not obvious and a new traffic jam point is easily caused.
The embodiment of the invention provides a bottleneck road section traffic flow adjusting method based on traffic big data, which comprises the following steps:
acquiring the entrance flow, the exit flow and the vehicle queue length of the bottleneck road section;
determining the total regulating quantity of the bottleneck road section according to the difference between the incoming flow and the outgoing flow of the bottleneck road section and the vehicle queuing length;
determining the regulating quantity of each regulating road section according to the driving-in flow and the driving-out flow of the bottleneck road section and the total regulating quantity of the bottleneck road section, wherein the regulating road section is a road section which is directly or indirectly connected with the bottleneck road section and has the traffic flow meeting the set conditions;
determining a traffic phase parameter of the adjusting road section according to the adjusting quantity of the adjusting road section and the residual capacity of the adjusting road section, wherein the residual capacity is determined by the queuing length of the adjusting road section;
and regulating the traffic flow of the bottleneck road section according to the traffic phase parameters of the regulating road section.
Optionally, the regulation section comprises an upstream regulation section and a downstream regulation section;
the determining the regulating quantity of each regulating road section according to the driving-in flow and the driving-out flow of the bottleneck road section and the total regulating quantity of the bottleneck road section comprises the following steps:
determining an upstream regulating variable and a downstream regulating variable of the bottleneck road section according to the driving-in flow and the driving-out flow of the bottleneck road section and the total regulating variable of the bottleneck road section;
determining the regulating quantity of the upstream regulating road section according to the upstream regulating quantity of the bottleneck road section and the traffic flow of the upstream regulating road section;
and determining the regulating quantity of the downstream regulating road section according to the downstream regulating quantity of the bottleneck road section and the traffic flow of the downstream regulating road section.
Optionally, the determining of the upstream regulating variable and the downstream regulating variable of the bottleneck road section according to the incoming flow rate and the outgoing flow rate of the bottleneck road section and the total regulating variable of the bottleneck road section conforms to the following formula (1) and formula (2):
the formula (1) is:
wherein, is Δ QoutIs the downstream regulating variable of the bottleneck section, and Δ Q is the total regulating variable of the bottleneck section, QinFor the entry flow of a bottleneck section, QoutThe exit flow of the bottleneck road section;
the formula (2) is:
wherein, is Δ QinIs the upstream regulating variable of the bottleneck section, and Δ Q is the total regulating variable of the bottleneck section, QinFor the entry flow of a bottleneck section, QoutThe exit flow of the bottleneck road section.
Optionally, the determining the traffic phase parameter of the adjusted road segment according to the adjustment amount of the adjusted road segment and the remaining capacity of the adjusted road segment includes:
determining the traffic phase regulating quantity of the regulating road section according to the regulating quantity of the regulating road section, the residual capacity of the regulating road section and the vehicle flow of the regulating road section;
and determining the traffic phase parameter of the regulated road section according to the traffic phase regulating quantity.
Optionally, the determining of the remaining capacity of the adjusted road segment according to the queuing length of the adjusted road segment conforms to the following formula (3):
the formula (3) is:
wherein, is Δ QmFor regulating the remaining capacity of the section, n is the number of lanes, LsFor regulating critical queuing length for road congestion, LmFor regulating the length of the queue for the road section,/0The bicycle occupies the length when the bottle neck is formed.
Correspondingly, the embodiment of the invention also provides a device for regulating the traffic flow of the bottleneck road section based on the traffic big data, which comprises the following components:
the acquisition module is used for acquiring the driving-in flow, the driving-out flow and the vehicle queuing length of the bottleneck road section;
the processing module is used for determining the total regulating quantity of the bottleneck road section according to the difference between the incoming flow and the outgoing flow of the bottleneck road section and the vehicle queuing length; determining the regulating quantity of each regulating road section according to the driving-in flow and the driving-out flow of the bottleneck road section and the total regulating quantity of the bottleneck road section, wherein the regulating road section is a road section which is directly or indirectly connected with the bottleneck road section and has the traffic flow meeting the set conditions; determining a traffic phase parameter of the adjusting road section according to the adjusting quantity of the adjusting road section and the residual capacity of the adjusting road section, wherein the residual capacity is determined by the queuing length of the adjusting road section;
and the adjusting module is used for adjusting the traffic flow of the bottleneck road section according to the traffic phase parameter of the adjusting road section.
Optionally, the processing module is specifically configured to:
the adjusting road section comprises an upstream adjusting road section and a downstream adjusting road section;
determining an upstream regulating variable and a downstream regulating variable of the bottleneck road section according to the driving-in flow and the driving-out flow of the bottleneck road section and the total regulating variable of the bottleneck road section;
determining the regulating quantity of the upstream regulating road section according to the upstream regulating quantity of the bottleneck road section and the traffic flow of the upstream regulating road section;
and determining the regulating quantity of the downstream regulating road section according to the downstream regulating quantity of the bottleneck road section and the traffic flow of the downstream regulating road section.
Optionally, the processing module is specifically configured to:
determining a downstream adjustment amount of the bottleneck section according to the following formula (1):
the formula (1) is:
wherein, is Δ QoutIs the downstream regulating variable of the bottleneck section, and Δ Q is the total regulating variable of the bottleneck section, QinFor the entry flow of a bottleneck section, QoutThe exit flow of the bottleneck road section;
determining an upstream adjustment amount of the bottleneck section according to the following formula (2):
wherein, is Δ QinIs the upstream regulating variable of the bottleneck section, and Δ Q is the total regulating variable of the bottleneck section, QinFor the entry flow of a bottleneck section, QoutThe exit flow of the bottleneck road section.
Optionally, the processing module is specifically configured to:
determining the traffic phase regulating quantity of the regulating road section according to the regulating quantity of the regulating road section, the residual capacity of the regulating road section and the vehicle flow of the regulating road section;
and determining the traffic phase parameter of the regulated road section according to the traffic phase regulating quantity.
Optionally, the processing module is specifically configured to:
determining the remaining capacity of the regulation section according to the following formula (3);
the formula (3) is:
wherein, is Δ QmFor regulating the remaining capacity of the section, n is the number of lanes, LsTo adjust forCritical length of queue for congestion in road section, LmFor regulating the length of the queue for the road section,/0The bicycle occupies the length when the bottle neck is formed.
The embodiment of the invention shows that the driving-in flow, the driving-out flow and the vehicle queuing length of the bottleneck road section are obtained. And determining the total regulating quantity of the bottleneck road section according to the difference between the driving-in flow and the driving-out flow of the bottleneck road section and the vehicle queuing length, and then determining the regulating quantity of each regulating road section according to the driving-in flow, the driving-out flow and the total regulating quantity of the bottleneck road section, wherein the regulating road section is a road section which is directly or indirectly connected with the bottleneck road section and has the traffic flow meeting the set conditions. And then determining the traffic phase parameter of the adjusting road section according to the adjusting quantity of the adjusting road section and the residual capacity of the adjusting road section, wherein the residual capacity is determined by the queuing length of the adjusting road section. And finally, regulating the traffic flow of the bottleneck road section according to the traffic phase parameters of the regulating road section. In the embodiment of the invention, the road section which is directly or indirectly connected with the bottleneck road section and has the traffic flow meeting the set conditions is fully utilized to evacuate the traffic flow, so that the efficiency of regulating the traffic flow of the bottleneck road section is improved. In addition, the adjustment amount is distributed to the adjustment road section according to the residual capacity of the adjustment road section, so that a new traffic jam point is avoided in the process of adjusting the traffic flow of the bottleneck road section.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be 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 to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a method for regulating traffic flow of a bottleneck road section based on traffic big data according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for creating a downstream regulation plan of a bottleneck road section according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a method for creating an upstream regulation plan of a bottleneck road section according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of another method for regulating traffic flow of a bottleneck road section based on traffic big data according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a traffic flow regulating device for a bottleneck road section based on traffic big data according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 exemplarily shows a flow of a bottleneck road section traffic flow regulating method based on traffic big data according to an embodiment of the present invention, where the flow may be executed by a bottleneck road section traffic flow regulating device based on traffic big data.
As shown in fig. 1, the specific steps of the process include:
and step S101, acquiring the entrance flow, the exit flow and the vehicle queue length of the bottleneck road section.
And step S102, determining the total regulating quantity of the bottleneck road section according to the difference between the incoming flow and the outgoing flow of the bottleneck road section and the vehicle queuing length.
And step S103, determining the regulating quantity of each regulating road section according to the driving-in flow and the driving-out flow of the bottleneck road section and the total regulating quantity of the bottleneck road section.
And step S104, determining the traffic phase parameter of the adjusting road section according to the adjusting quantity of the adjusting road section and the residual capacity of the adjusting road section.
And S105, adjusting the traffic flow of the bottleneck road section according to the traffic phase parameter of the adjusting road section.
Specifically, in step S101, the bottleneck road section refers to a one-way road section, and is a road section with a queuing length close to or equal to the total length of the road section when congestion occurs, the bottleneck road section includes an upstream intersection and a downstream intersection, the traffic flow entering from the upstream intersection is the entering flow of the bottleneck road section, and the traffic flow exiting from the downstream intersection is the exiting flow of the bottleneck road section. The entrance flow, the exit flow and the vehicle queuing length of the bottleneck road section can be obtained through electric alarm data or card port data.
In step S102, the difference between the entry flow rate and the exit flow rate of the bottleneck link conforms to the following formula (4):
ΔQ1＝Qin-Qout…………………………………(4)
wherein, is Δ Q1Difference between the incoming and outgoing flow of the bottleneck section, QinFor the entry flow of a bottleneck section, QoutThe exit flow of the bottleneck road section.
And then determining the queuing dispersion amount of the bottleneck road section according to the vehicle queuing degree of the bottleneck road section, wherein the queuing dispersion amount is the vehicle flow which needs to be dispersed when the driving flow and the driving flow of the bottleneck road section are not considered, and the queuing dispersion amount specifically accords with the following formula (5).
Wherein, is Δ Q2N is the number of lanes on the bottleneck section, L is the length of the bottleneck section, and L is the queuing dispersion amountideaIdeal queuing length for the end of the bottleneck0The bicycle occupies the length when the bottle neck is closed.
Ideal queue length L of bottleneck road section for preventing frequent trigger of bottleneckideaCertain conditions need to be met, namely that no green light is left empty after bottleneck control is finished, and the dissipation length is generally not more than 2/3 of the length of the road section. To determine LideaFirstly, calculating the dissipation length of a downstream intersection directly connected with the bottleneck road section in one period, and specifically according to the following formula (6):
wherein L isgIs a bottle neckThe dissipation length of one cycle of the downstream crossing directly connected with the road section, C is the crossing cycle, QoutThe exit flow of the bottleneck road section, n is the number of lanes of the bottleneck road section, l0The length occupied by the bicycle is shortened when the bottle neck is in, and delta T is a sampling time interval.
Since the dissipation length is generally not greater than 2/3 for the road segment length, when calculated according to equation (6)
When L isidea＝LgOtherwise, to
After the queuing dispersion amount of the bottleneck road section is determined, the total regulating amount of the bottleneck road section is determined to be in accordance with the following formula (7) according to the difference between the incoming flow and the outgoing flow of the bottleneck road section and the queuing dispersion amount of the bottleneck road section:
wherein, the delta Q is the total adjustment amount of the bottleneck road section in the time period T, the T is the ideal dissipation time of the bottleneck road section, and the delta Q2For queuing overhead, Δ Q1The difference between the incoming flow and the outgoing flow of the bottleneck road section is shown, and delta T is a sampling time interval. In a specific implementation, the ideal dissipation time T of the neck section can be determined by the following equation (8):
where T is an ideal dissipation time of the bottleneck road segment, N is an adjustment coefficient, and a positive integer is taken, for example, N is 3, Δ Q2For the amount of queue dispersion, Δ T is the sampling time interval, QoutThe exit flow of the bottleneck road section.
In step S103, the adjustment link is a link that is directly or indirectly connected to the bottleneck link and satisfies the set condition with respect to the traffic flow. For example, an upstream intersection of the bottleneck road is set as a, a downstream intersection is set as B, three intersections of X1, X2 and X3 are arranged upstream of the upstream intersection a, two intersections of X11 and X12 are arranged upstream of the intersection X1, three intersections of X4, X5 and X6 are arranged downstream of the downstream intersection B, then the intersections are X1 → A, X2 → A, X3 → A, B → X4, B → X5 and B → X6 which are all directly connected with the bottleneck road, the intersections of X11 → X1 and X12 → X1 which are indirectly connected with the bottleneck of the road are set, and the road where the traffic flow meets the set threshold is determined as the regulation road by counting the traffic flow of each road. After all the adjusting road sections are determined, a path graph can be drawn according to the topological relation between the adjusting road sections and the corresponding intersections of the adjusting road sections, and the control ranges of the upper stream and the lower stream of the bottleneck road sections are determined according to the path graph.
In step S104, the traffic phase parameter of the road section is adjusted to adjust the traffic light phase time or green signal ratio of the upstream intersection or the downstream intersection of the road section. The remaining capacity of the adjusting road section is the traffic flow which can be contained in the adjusting road section at present, and is determined by the queuing length of the adjusting road section, and specifically accords with the following formula (3):
wherein, is Δ QmFor regulating the remaining capacity of the section, n is the number of lanes, LsFor regulating critical queuing length for road congestion, LmFor regulating the length of the queue for the road section,/0The bicycle occupies the length when the bottle neck is formed. Different road section lengths and road section congestion critical queuing length LsAre different, table 1 shows exemplary L for different road segment lengthssValues, as shown in table 1:
TABLE 1
In step S105, after the traffic phase parameter of the adjustment section is adjusted, the traffic flow of the corresponding adjustment section may change, for example, the red light time of the adjustment section on the upstream of the bottleneck section may be prolonged to reduce the traffic flow entering the bottleneck section, and the green light time of the adjustment section on the downstream of the bottleneck section may be prolonged to increase the traffic flow leaving the bottleneck section, thereby implementing the evacuation of the traffic flow on the bottleneck section.
The embodiment of the invention shows that the driving-in flow, the driving-out flow and the vehicle queuing length of the bottleneck road section are obtained. And determining the total regulating quantity of the bottleneck road section according to the difference between the driving-in flow and the driving-out flow of the bottleneck road section and the vehicle queuing length, and then determining the regulating quantity of each regulating road section according to the driving-in flow, the driving-out flow and the total regulating quantity of the bottleneck road section, wherein the regulating road section is a road section which is directly or indirectly connected with the bottleneck road section and has the traffic flow meeting the set conditions. And then determining the traffic phase parameter of the adjusting road section according to the adjusting quantity of the adjusting road section and the residual capacity of the adjusting road section, wherein the residual capacity is determined by the queuing length of the adjusting road section. And finally, regulating the traffic flow of the bottleneck road section according to the traffic phase parameters of the regulating road section. In the embodiment of the invention, the road section which is directly or indirectly connected with the bottleneck road section and has the traffic flow meeting the set conditions is fully utilized to evacuate the traffic flow, so that the efficiency of regulating the traffic flow of the bottleneck road section is improved. In addition, the adjustment amount is distributed to the adjustment road section according to the residual capacity of the adjustment road section, so that a new traffic jam point is avoided in the process of adjusting the traffic flow of the bottleneck road section.
The following describes a process for creating a traffic flow adjustment scheme for a bottleneck road section in conjunction with a specific embodiment. The bottleneck road section traffic flow regulating scheme comprises an upstream regulating scheme and a downstream regulating scheme, and the regulating road section for regulating the traffic flow of the bottleneck road section comprises an upstream regulating road section and a downstream regulating road section.
Firstly, dividing the total regulating quantity of the bottleneck road section into an upstream regulating quantity and a downstream regulating quantity according to the driving-in flow and the driving-out flow of the bottleneck road section, wherein the upstream regulating quantity and the downstream regulating quantity are specifically in accordance with the following formula (1) and formula (2):
the formula (1) is:
wherein, is Δ QoutDownstream regulation for bottleneck sectionQuantity, Δ Q, is the total regulating quantity, Q, of the bottleneck sectioninFor the entry flow of a bottleneck section, QoutThe exit flow of the bottleneck road section;
the formula (2) is:
wherein, is Δ QinIs the upstream regulating variable of the bottleneck section, and Δ Q is the total regulating variable of the bottleneck section, QinFor the entry flow of a bottleneck section, QoutThe exit flow of the bottleneck road section.
And then, a downstream regulating scheme is made according to the downstream regulating quantity of the bottleneck section, and an upstream regulating scheme is made according to the upstream regulating quantity.
The following describes the process of creating the bottleneck section downstream regulation scheme and the bottleneck section upstream regulation scheme.
Firstly, a process for making a downstream regulation scheme of a bottleneck section is described, which comprises the following steps, as shown in fig. 2:
step S201, determining the regulating quantity of the downstream regulating road section according to the downstream regulating quantity of the bottleneck road section and the vehicle flow of the downstream regulating road section.
And step S202, determining the traffic phase regulating quantity of the downstream regulating road section according to the regulating quantity of the downstream regulating road section, the residual capacity of the downstream regulating road section and the traffic flow of the downstream regulating road section.
And step S203, determining the traffic phase parameter of the downstream regulation road section according to the traffic phase regulation quantity of the downstream regulation road section.
And step S204, regulating the traffic flow of the bottleneck road section according to the traffic phase parameters of the downstream regulating road section.
Specifically, in step S201, the downstream adjusting sections of the bottleneck section may be classified, for example, the adjusting section directly connected to the downstream intersection of the bottleneck section is a downstream first-level adjusting section, the adjusting section directly connected to the downstream first-level adjusting section is a downstream second-level adjusting section, and so on until the levels of all the downstream adjusting sections are determined. After the level of the downstream adjusting road section is determined, the adjusting quantity of the downstream adjusting road section is determined according to the downstream adjusting quantity of the bottleneck road section and the vehicle flow of the downstream adjusting road section, and the downstream adjusting road section is explained by the following first-stage adjusting road section, and the specific formula is in accordance with the formula (9):
wherein Q isiRegulating the regulating variable q of the section i for the downstream stageiRegulating the traffic flow, Δ Q, of section i for the downstream stageoutDownstream adjustment of the bottleneck section. The method for determining the adjustment amount of the downstream adjustment section of the other level is the same as the above method, and is not described herein again.
In step S202, the traffic phase adjustment amount may be an adjustment amount of the split ratio, or may be a phase compression ratio or the like. Firstly, determining the green signal ratio regulating quantity of a downstream primary regulating road section according to the regulating quantity of the downstream primary regulating road section and the traffic flow of the downstream primary regulating road section, wherein the green signal ratio regulating quantity of the downstream primary regulating road section is specifically in accordance with a formula (10):
in the above formula,. DELTA.giRegulating the green ratio of section i for the downstream stage, QiRegulating the regulating variable of the section i for the downstream stage, giAdjusting the original split ratio of the section i for the downstream first stage, delta T is the sampling time interval, qiAnd regulating the traffic flow of the section i for the downstream stage, and T is the ideal dissipation time of the bottleneck section.
Then, determining the maximum green ratio regulating quantity of the downstream primary regulating road section according to the residual capacity of the downstream primary regulating road section and the traffic flow of the downstream primary regulating road section, wherein the maximum green ratio regulating quantity of the downstream primary regulating road section is specifically in accordance with a formula (11):
wherein, Δ gimaxMaximum split regulation, g, for downstream primary regulation section iiAdjusting the Primary split, Δ Q, of a road section i for a downstream stagemiAdjusting the residual capacity of a section i for the downstream stage, delta T is the sampling time interval, qiAnd regulating the traffic flow of the section i for the downstream stage, and T is the ideal dissipation time of the bottleneck section.
The green ratio regulating quantity delta g of the next stage regulating road section iiGreater than the corresponding maximum split adjustment Δ gimaxIn the meantime, it is explained that the adjustment amount allocated to the downstream primary adjustment section i is larger than the remaining capacity of the downstream primary adjustment section i at this time, and it is necessary to adjust the split adjustment amount of the downstream primary adjustment section i to Δ gimaxAnd simultaneously correspondingly adjusting the adjustment quantity of the downstream primary adjustment road section i. And distributing the regulating quantity exceeding the residual capacity in the downstream primary regulating road section i to a downstream secondary regulating road section, wherein the distribution method is the same as that of the downstream primary regulating road section, and the details are not repeated here. And so on until the downstream regulating quantity is totally distributed to the downstream regulating road section according to the method and the split green ratio regulating quantity of the downstream regulating road section is determined.
In step S203 and step S204, a traffic phase parameter of the downstream regulation road section is determined according to the split regulation amount of the downstream regulation road section, and the traffic flow of the bottleneck road section is regulated according to the traffic phase parameter of the downstream regulation road section. In the embodiment of the invention, when the bottleneck road section is congested, the regulating quantity is reasonably distributed according to the traffic flow of the downstream regulating road section and the residual capacity of the downstream regulating road section, so that the traffic flow of the bottleneck road section is evacuated by the downstream regulating road section is fully utilized, and a new congestion point is avoided.
In the downstream control range, besides the downstream regulation road section, there is also a non-regulation road section, and when the traffic phase parameter of the downstream regulation road section is regulated, the traffic phase parameter of the non-regulation road section inevitably needs to be regulated, in the embodiment of the invention, the following method is adopted to regulate the traffic phase parameter of the non-regulation road section: and setting the phase corresponding to the channel in the inlet direction of the downstream adjusting section as an adjusting phase, and setting the phase of the passively increased non-adjusting section as a passive adjusting phase. When the split of the adjusted phase is increased, if the graphs in the adjusted timing scheme are aligned, then the time of the other phase does not need to be adjusted,if the ring diagrams in the new scheme are not aligned, the remaining time is allocated. The specific allocation method is as follows: if the half-ring has the adjusting phase, judging whether the requirement of the residual capacity is met after the residual time is allocated to the adjusting phase, if not, taking delta g as the adjusting time of the adjusting phasei,maxThe residual time is distributed to other phases according to the proportion of the original split ratio; if yes, distributing the residual time to the adjusting phase; if the semi-ring does not adjust the phase, the semi-ring is distributed to other phases according to the proportion of the original split ratio.
After the adjustment scheme downstream of the bottleneck section has been determined, the adjustment scheme needs to be checked, and cannot be implemented in several cases:
in case one, the downstream regulation section has already been in a queue congestion condition.
And secondly, estimating the queuing length of the non-adjusted road section after the time period T of implementing the adjusting scheme, and when the estimated queuing length of the non-adjusted road section is greater than the congestion critical queuing length of the road section, indicating that the adjusting scheme can cause congestion of the non-adjusted road section.
By detecting the downstream regulation scheme, the influence of the regulation scheme on the non-regulation road section is estimated in advance, and new congestion caused by the implementation of the regulation scheme on the non-regulation road section is effectively avoided.
The following describes a process for making an upstream regulation plan of a bottleneck section, including the following steps, as shown in fig. 3:
and step S301, determining the regulating quantity of the upstream regulating road section according to the upstream regulating quantity of the bottleneck road section and the traffic flow of the upstream regulating road section.
And step S302, determining the phase compression ratio of the upstream regulation road section according to the regulation quantity of the upstream regulation road section, the residual capacity of the upstream regulation road section and the traffic flow of the upstream regulation road section.
And step S303, determining the traffic phase parameter of the upstream adjusting road section according to the phase compression ratio of the upstream adjusting road section.
And step S304, regulating the traffic flow of the bottleneck road section according to the traffic phase parameter of the upstream regulating road section.
Specifically, in step S301, the upstream adjusting road section of the bottleneck road section is graded to determine a first-level upstream adjusting road section, a second-level upstream adjusting road section, and the like, and the specific grading method is the same as that of the downstream adjusting road section, and is not described here again. After the level of the upstream adjusting section is determined, the adjusting quantity of the upstream adjusting section is determined according to the upstream adjusting quantity of the bottleneck section and the vehicle flow of the upstream adjusting section, which is explained by taking the upstream adjusting section as an example, and is specifically expressed as a formula (12):
wherein Q isjFor regulating the regulating variable of the section j upstream of the primary stage, qjRegulating the traffic flow, Δ Q, of a section j for an upstream stageinThe upstream adjustment amount for the bottleneck section. When the downstream adjustment section of the bottleneck section cannot adjust the downstream adjustment amount of the bottleneck section allocated in advance, the sum of the traffic flow rate which cannot be adjusted by the downstream adjustment section and the upstream adjustment amount allocated in advance can be used as the actual upstream adjustment amount of the bottleneck section. The method for determining the adjustment amount of the upstream adjustment section of the other level is the same as the above method, and is not described herein again.
In step S302, it is first determined whether the adjustment amount of the upstream primary adjustment section j is greater than the remaining capacity of the upstream primary adjustment section j, and if so, the adjustment amount of the upstream primary adjustment section j is adjusted, and the excess adjustment amount is distributed to the upstream secondary adjustment section. Then, the phase compression ratio of the upstream first-stage adjusting road section is determined according to the adjusting quantity of the upstream adjusting road section and the traffic flow of the upstream adjusting road section, and the upstream first-stage adjusting road section is taken as an example for explanation, and the phase compression ratio specifically accords with a formula (13):
wherein, Δ λjIs upstreamFirst-stage regulation of phase compression ratio, Q, of road section jjFor regulating the regulating variable of the section j upstream of the primary stage, qjAnd regulating the traffic flow of the road section j for the upstream first stage, wherein delta T is a sampling time interval, and T is the ideal dissipation time of the bottleneck road section. The calculation method of the phase compression ratio of the adjusting road sections at other levels at the upstream of the bottleneck road section is the same as that of the adjusting road section at the upstream level, and is not repeated here.
In addition, the phase compression ratio of the upstream first-stage adjusting road section can be determined according to the upstream adjusting quantity of the bottleneck road section and the total traffic flow of the upstream first-stage adjusting road section, and the phase compression ratio specifically accords with a formula (14):
wherein, Δ λinPhase compression ratio, Δ Q, of an upstream primary regulation sectioninFor upstream regulation of bottleneck sections, qjAnd regulating the traffic flow of the road section j for the upstream first stage, wherein delta T is a sampling time interval, and T is the ideal dissipation time of the bottleneck road section. The phase compression ratio of each upstream primary adjusting section is the same. It should be noted that the method for calculating the phase compression ratio of the adjustment section at another level upstream of the bottleneck section is the same as the method for calculating the phase compression ratio of the adjustment section at the first level upstream, and details are not repeated here.
In steps S303 and S304, the green time of the phase of the upstream adjusting road section is compressed according to the phase compression ratio of the upstream adjusting road section, the compressed residual time is completely supplemented with red light, and the traffic flow of the bottleneck road section is adjusted according to the adjusted phase. The traffic phase parameter of the upstream adjusting road section of the bottleneck road section is adjusted, the traffic flow entering the bottleneck road section is controlled, the congestion of the bottleneck road section is effectively relieved, in addition, the adjusting capacity of the upstream adjusting road section is determined according to the residual capacity of the upstream adjusting road section, the adjusting capacity of the upstream adjusting road section is fully considered, and therefore the generation of new congestion points is avoided.
In order to better explain the embodiment of the present invention, the following describes a flow of the method for adjusting the traffic flow of the bottleneck road section based on the traffic big data according to the embodiment of the present invention through a specific implementation scenario.
As shown in fig. 4, the method comprises the steps of:
and step S401, acquiring the entrance flow, the exit flow and the vehicle queue length of the bottleneck road section.
Step S402, determining the total regulating quantity of the bottleneck road section according to the difference between the incoming flow and the outgoing flow of the bottleneck road section and the vehicle queue length.
And step S403, determining an upstream regulating variable and a downstream regulating variable of the bottleneck road section according to the entrance flow and the exit flow of the bottleneck road section and the total regulating variable of the bottleneck road section.
And S404, making a downstream adjusting scheme of the bottleneck road section according to the downstream adjusting quantity of the bottleneck road section, the traffic flow of the downstream adjusting road section and the residual capacity of the downstream adjusting road section.
Step S405, checking whether the downstream regulation scheme of the bottleneck road section is qualified, if so, executing step S406, otherwise, executing step S407.
And step S406, issuing a downstream regulation scheme of the bottleneck road section.
And step S407, canceling the regulation scheme of the unqualified issued downstream regulation road section, and issuing the regulation scheme of the qualified downstream regulation road section.
And step S408, making a bottleneck road section upstream adjusting scheme according to the upstream adjusting quantity of the bottleneck road section, the traffic flow of the upstream adjusting road section, the residual capacity of the upstream adjusting road section and the downstream adjusting quantity which cannot be adjusted by the downstream adjusting road section.
And step S409, issuing an upstream regulation scheme of the bottleneck road section.
The embodiment of the invention shows that the driving-in flow, the driving-out flow and the vehicle queuing length of the bottleneck road section are obtained. And determining the total regulating quantity of the bottleneck road section according to the difference between the driving-in flow and the driving-out flow of the bottleneck road section and the vehicle queuing length, and then determining the regulating quantity of each regulating road section according to the driving-in flow, the driving-out flow and the total regulating quantity of the bottleneck road section, wherein the regulating road section is a road section which is directly or indirectly connected with the bottleneck road section and has the traffic flow meeting the set conditions. And then determining the traffic phase parameter of the adjusting road section according to the adjusting quantity of the adjusting road section and the residual capacity of the adjusting road section, wherein the residual capacity is determined by the queuing length of the adjusting road section. And finally, regulating the traffic flow of the bottleneck road section according to the traffic phase parameters of the regulating road section. In the embodiment of the invention, the road section which is directly or indirectly connected with the bottleneck road section and has the traffic flow meeting the set conditions is fully utilized to evacuate the traffic flow, so that the efficiency of regulating the traffic flow of the bottleneck road section is improved. In addition, the adjustment amount is distributed to the adjustment road section according to the residual capacity of the adjustment road section, so that a new traffic jam point is avoided in the process of adjusting the traffic flow of the bottleneck road section.
Based on the same conception, fig. 5 exemplarily shows a structure of a bottleneck road section traffic flow regulating device based on traffic big data, which can execute a flow of a bottleneck road section traffic flow regulating method based on traffic big data according to an embodiment of the present invention.
As shown in fig. 5, the apparatus includes:
an obtaining module 501, configured to obtain an entrance flow, an exit flow, and a vehicle queue length of a bottleneck road segment;
a processing module 502, configured to determine a total adjustment amount of the bottleneck road section according to a difference between an incoming flow and an outgoing flow of the bottleneck road section and the vehicle queue length; determining the regulating quantity of each regulating road section according to the driving-in flow and the driving-out flow of the bottleneck road section and the total regulating quantity of the bottleneck road section, wherein the regulating road section is a road section which is directly or indirectly connected with the bottleneck road section and has the traffic flow meeting the set conditions; determining a traffic phase parameter of the adjusting road section according to the adjusting quantity of the adjusting road section and the residual capacity of the adjusting road section, wherein the residual capacity is determined by the queuing length of the adjusting road section;
and the adjusting module 503 is configured to adjust the traffic flow of the bottleneck road section according to the traffic phase parameter of the adjusted road section.
Optionally, the processing module 502 is specifically configured to:
the adjusting road section comprises an upstream adjusting road section and a downstream adjusting road section;
determining an upstream regulating variable and a downstream regulating variable of the bottleneck road section according to the driving-in flow and the driving-out flow of the bottleneck road section and the total regulating variable of the bottleneck road section;
determining the regulating quantity of the upstream regulating road section according to the upstream regulating quantity of the bottleneck road section and the traffic flow of the upstream regulating road section;
and determining the regulating quantity of the downstream regulating road section according to the downstream regulating quantity of the bottleneck road section and the traffic flow of the downstream regulating road section.
Optionally, the processing module 502 is specifically configured to:
determining a downstream adjustment amount of the bottleneck section according to the following formula (1):
the formula (1) is:
wherein, is Δ QoutIs the downstream regulating variable of the bottleneck section, and Δ Q is the total regulating variable of the bottleneck section, QinFor the entry flow of a bottleneck section, QoutThe exit flow of the bottleneck road section;
determining an upstream adjustment amount of the bottleneck section according to the following formula (2):
wherein, is Δ QinIs the upstream regulating variable of the bottleneck section, and Δ Q is the total regulating variable of the bottleneck section, QinFor the entry flow of a bottleneck section, QoutThe exit flow of the bottleneck road section.
Optionally, the processing module 502 is specifically configured to:
determining the traffic phase regulating quantity of the regulating road section according to the regulating quantity of the regulating road section, the residual capacity of the regulating road section and the vehicle flow of the regulating road section;
and determining the traffic phase parameter of the regulated road section according to the traffic phase regulating quantity.
Optionally, the processing module 502 is specifically configured to:
determining the remaining capacity of the regulation section according to the following formula (3);
the formula (3) is:
wherein, is Δ QmFor regulating the remaining capacity of the section, n is the number of lanes, LsFor regulating critical queuing length for road congestion, LmFor regulating the length of the queue for the road section,/0The bicycle occupies the length when the bottle neck is formed.
It should be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A bottleneck road section traffic flow adjusting method based on traffic big data is characterized by comprising the following steps:
acquiring the entrance flow, the exit flow and the vehicle queue length of the bottleneck road section;
determining a queuing dispersion amount of the bottleneck road section according to the vehicle queuing length of the bottleneck road section, wherein,
ΔQ2n is the number of lanes on the bottleneck section, L is the length of the bottleneck section, and L is the queuing dispersion amountideaIdeal queuing length of said vehicles, l, for the section of road at the end of the bottleneck0The bicycle occupies the bottle neckLength of use;
wherein the dissipation length L of one cycle is determined according to the downstream intersection directly connected with the bottleneck sectiongDetermining LideaThe method comprises the following steps:
computing
C is the crossing period, QoutThe traffic is the exit flow of the bottleneck road section, and delta T is a sampling time interval;
when according to
When L isidea＝Lg(ii) a Otherwise make
Determining the total regulating quantity of the bottleneck road section according to the difference between the incoming flow and the outgoing flow of the bottleneck road section and the queuing dispersion quantity of the bottleneck road section;
determining an upstream regulating variable and a downstream regulating variable of the bottleneck road section according to the driving-in flow and the driving-out flow of the bottleneck road section and the total regulating variable of the bottleneck road section;
determining the regulating quantity of a regulating road section according to the upstream regulating quantity or the downstream regulating quantity of the bottleneck road section, wherein the regulating road section is directly or indirectly connected with the bottleneck road section and the traffic flow meets set conditions, and the regulating road section comprises an upstream regulating road section and a downstream regulating road section; determining a traffic phase parameter of the adjusting road section according to the adjusting quantity of the adjusting road section and the residual capacity of the adjusting road section, wherein the residual capacity is determined by the queuing length of the adjusting road section, and the set condition is that the traffic flow of the road section meets a set threshold value;
and regulating the traffic flow of the bottleneck road section according to the traffic phase parameters of the regulating road section.
2. The method of claim 1, wherein determining an adjusted stretch adjustment based on an upstream adjustment or a downstream adjustment of the bottleneck stretch comprises:
determining the regulating quantity of the regulating road section according to the upstream regulating quantity of the bottleneck road section and the traffic flow of the upstream regulating road section;
and determining the regulating quantity of the regulating road section according to the downstream regulating quantity of the bottleneck road section and the traffic flow of the downstream regulating road section.
3. The method according to claim 2, wherein the determining of the upstream regulating variable and the downstream regulating variable of the bottleneck section from the entry flow rate and the exit flow rate of the bottleneck section and the total regulating variable of the bottleneck section is in accordance with the following formulas (1) and (2):
the formula (1) is:
wherein, is Δ QoutIs the downstream regulating variable of the bottleneck section, and Δ Q is the total regulating variable of the bottleneck section, QinFor the entry flow of a bottleneck section, QoutThe exit flow of the bottleneck road section;
the formula (2) is:
wherein, is Δ QinIs the upstream regulating variable of the bottleneck section, and Δ Q is the total regulating variable of the bottleneck section, QinFor the entry flow of a bottleneck section, QoutThe exit flow of the bottleneck road section.
4. The method of claim 1, wherein determining the traffic phase parameter for the adjusted road segment based on the adjusted amount of the adjusted road segment and the remaining capacity of the adjusted road segment comprises:
determining the traffic phase regulating quantity of the regulating road section according to the regulating quantity of the regulating road section, the residual capacity of the regulating road section and the vehicle flow of the regulating road section;
and determining the traffic phase parameter of the regulated road section according to the traffic phase regulating quantity.
5. The method of claim 1, wherein the determining of the remaining capacity of the adjusted leg based on the queuing length of the adjusted leg is in accordance with the following equation (3):
the formula (3) is:
wherein, is Δ QmFor regulating the remaining capacity of the section, n is the number of lanes, LsFor regulating critical queuing length for road congestion, LmFor regulating the length of the queue for the road section,/0The bicycle occupies the length when the bottle neck is formed.
6. The utility model provides a bottleneck highway section vehicle flow adjusting device based on traffic big data which characterized in that includes:
the acquisition module is used for acquiring the driving-in flow, the driving-out flow and the vehicle queuing length of the bottleneck road section;
a processing module for determining a queuing dispersion amount of the bottleneck section according to the vehicle queuing length of the bottleneck section, wherein,
ΔQ2n is the number of lanes on the bottleneck section, L is the length of the bottleneck section, and L is the queuing dispersion amountideaIdeal queuing length of said vehicles, l, for the section of road at the end of the bottleneck0The length occupied by the bicycle is the bottleneck;
wherein the dissipation length L of one cycle is determined according to the downstream intersection directly connected with the bottleneck sectiongDetermining LideaThe method comprises the following steps:
computing
C is the crossing period, QoutThe traffic is the exit flow of the bottleneck road section, and delta T is a sampling time interval;
when according to
When L isidea＝Lg(ii) a Otherwise make
Determining the total regulating quantity of the bottleneck road section according to the difference between the incoming flow and the outgoing flow of the bottleneck road section and the queuing dispersion quantity of the bottleneck road section; determining an upstream regulating variable and a downstream regulating variable of the bottleneck road section according to the driving-in flow and the driving-out flow of the bottleneck road section and the total regulating variable of the bottleneck road section; determining an adjusting road section adjusting quantity according to the upstream adjusting quantity or the downstream adjusting quantity of the bottleneck road section, wherein the adjusting road section is directly or indirectly connected with the bottleneck road section and the traffic flow meets set conditions, and the adjusting road section comprises an upstream adjusting road section and a downstream adjusting road section; determining a traffic phase parameter of the adjusting road section according to the adjusting quantity of the adjusting road section and the residual capacity of the adjusting road section, wherein the residual capacity is determined by the queuing length of the adjusting road section, and the set condition is that the traffic flow of the road section meets a set threshold value;
and the adjusting module is used for adjusting the traffic flow of the bottleneck road section according to the traffic phase parameter of the adjusting road section.
7. The apparatus of claim 6, wherein the processing module is specifically configured to:
determining the regulating quantity of the regulating road section according to the upstream regulating quantity of the bottleneck road section and the traffic flow of the upstream regulating road section;
and determining the regulating quantity of the regulating road section according to the downstream regulating quantity of the bottleneck road section and the traffic flow of the downstream regulating road section.
8. The apparatus of claim 7, wherein the processing module is specifically configured to:
determining a downstream adjustment amount of the bottleneck section according to the following formula (1):
the formula (1) is:
wherein, is Δ QoutIs the downstream regulating variable of the bottleneck section, and Δ Q is the total regulating variable of the bottleneck section, QinFor the entry flow of a bottleneck section, QoutThe exit flow of the bottleneck road section;
determining an upstream adjustment amount of the bottleneck section according to the following formula (2):
wherein, is Δ QinIs the upstream regulating variable of the bottleneck section, and Δ Q is the total regulating variable of the bottleneck section, QinFor the entry flow of a bottleneck section, QoutThe exit flow of the bottleneck road section.
9. The apparatus of claim 6, wherein the processing module is specifically configured to:
determining the traffic phase regulating quantity of the regulating road section according to the regulating quantity of the regulating road section, the residual capacity of the regulating road section and the vehicle flow of the regulating road section;
and determining the traffic phase parameter of the regulated road section according to the traffic phase regulating quantity.
10. The apparatus of claim 6, wherein the processing module is specifically configured to:
determining the remaining capacity of the regulation section according to the following formula (3);
the formula (3) is:
wherein, is Δ QmFor regulating the remaining capacity of the section, n is the number of lanes, LsFor regulating critical queuing length for road congestion, LmFor regulating the length of the queue for the road section,/0The bicycle occupies the length when the bottle neck is formed.
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| CN107993438A (en) * | 2017-12-08 | 2018-05-04 | 上海云砥信息科技有限公司 | A kind of highway bottleneck road congestion warning method |
| CN108109403B (en) * | 2017-12-29 | 2020-12-22 | 珠海国芯云科技有限公司 | Adaptive traffic light control system and method based on traffic flow |
| CN109118761B (en) * | 2018-08-21 | 2021-11-16 | 浙大网新系统工程有限公司 | Intelligent traffic solution method based on artificial intelligence and management system thereof |
| CN111462477A (en) * | 2019-01-22 | 2020-07-28 | 上海宝康电子控制工程有限公司 | Method for realizing anti-congestion control of tramcar based on road traffic state |
| CN110364002B (en) * | 2019-05-22 | 2020-09-11 | 江苏科创车联网产业研究院有限公司 | Vehicle three-level guidance control method and system in road traffic network |
| CN112492889B (en) * | 2019-11-21 | 2023-02-17 | 北京嘀嘀无限科技发展有限公司 | Traffic control system and method based on vehicle track data |
| CN111613053B (en) * | 2020-04-21 | 2021-06-15 | 北京掌行通信息技术有限公司 | Traffic disturbance detection and analysis method, device, storage medium and terminal |
| CN111785026B (en) * | 2020-07-24 | 2021-05-07 | 中国水利水电第八工程局有限公司 | Traffic diversion grading comprehensive dredging method under complex traffic condition |
| CN111932916B (en) * | 2020-07-31 | 2022-10-28 | 长沙理工大学 | Control method and control system for dynamic emergency lane of urban road |
| CN114863701B (en) * | 2022-04-26 | 2024-01-16 | 北京百度网讯科技有限公司 | Traffic signal lamp control method, device, electronic equipment and medium |
| CN116343488B (en) * | 2023-05-31 | 2023-07-28 | 山东高速信息集团有限公司 | Upstream flow regulating method, device and medium for highway toll plaza |
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