CN117238138B - Method and system for determining highway junction node channeling management and control strategy - Google Patents
Method and system for determining highway junction node channeling management and control strategy Download PDFInfo
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Abstract
The invention relates to a method and a system for determining a highway junction node channeling management and control strategy, which are used for collecting traffic running state sensing data of a highway junction node, including junction ramp flow and main line flow; determining a threshold value for starting and releasing the strategy according to the actual traffic capacity of the main line and the traffic capacity of the junction ramp entering the main line, calculating comparison data based on the current junction ramp flow, the main line flow and the actual traffic capacity of the main line, comparing the comparison data with the threshold value, and executing the starting and releasing of the strategy. According to the traffic congestion method, the congestion tendency is judged according to the traffic and the speed of the hub and the main line, the channeling strategy of the hub ramp is started in advance, and according to the control effect of the strategy, when the traffic congestion cannot be effectively relieved by the channeling strategy, the channeling strategy is timely relieved, other means are adopted, the effectiveness of implementation of the channeling strategy of the hub ramp is ensured, the traffic congestion of the main line is relieved, and the traffic efficiency of the main line is improved.
Description
Technical Field
The invention relates to the technical field of expressway traffic emergency management, in particular to an expressway junction node channeling management and control strategy determining method, and particularly relates to an expressway junction node channeling management and control strategy determining method facing main line traffic efficiency.
Background
The reasonable intelligent management and control strategy is beneficial to improving the operation efficiency of the expressway and improving the operation safety of the expressway. Therefore, it is necessary to develop the intelligent management and control strategy for the highway junction node channeling, and ensure the traffic capacity and efficiency of the main line.
The control mode during the congestion period of the highway junction node at the present stage basically depends on modes such as autonomous dissipation, traffic police on-site control and the like, the mode has low reaction speed and poor control effect, the control is usually carried out only in a congestion state with a large range, and road users are easy to be discontented. Therefore, aiming at the main line traffic efficiency, it is necessary to provide a highway junction node channeling determination method. However, the related content of the canalization of the current research is mainly optimized for the signal lamp of the urban intersection, the related research on determining the direction of the canalization strategy of the junction node of the expressway is not available, and the canalization of the junction node of the expressway is not supported by scientific theoretical basis.
Disclosure of Invention
The invention aims to fill the blank of the prior art and provide a method for determining a highway junction node channeling management and control strategy, which is suitable for the practical and scientific junction stage of the highway, reduces the influence of the junction on a main line and improves the traffic efficiency of the highway to the traffic efficiency of the main line.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
A method for determining a highway junction node channeling management and control strategy comprises the following steps:
Collecting traffic running state sensing data of a highway junction node, wherein the traffic running state sensing data comprise junction ramp flow Q r, speed R s, main line flow Q m and speed M s;
the first threshold S and the second threshold S' are defined as follows:
wherein, C m is the actual traffic capacity of the main line, and C r is the traffic capacity of the junction ramp entering the main line;
When (when) When the expressway junction node channeling strategy is started, expressway junction node channeling facilities are arranged and management and control information is distributed;
And after the time delay T, executing node canalization strategy removal judgment: when (when) Or/>And when the highway junction node channelizing strategy is released, the laid facilities are removed.
As a preferable implementation mode, the layout length of the highway junction node canalization facility is determined based on junction ramp flow, main line speed, vehicle average acceleration and junction ramp width-expanding section transition length.
As a preferred embodiment, the layout length of the highway junction node canalization facility is determined based on the following formula:
Wherein M s is the main line speed; r s is ramp speed; a is the average acceleration value of the vehicle; mu is the length value of the transition section of the width expanding section of the junction ramp, and is usually 30-50m.
As a preferred embodiment, the traffic capacity C r of the junction ramp junction into the main line is determined based on the following equation:
Cr＝Ct×η
wherein C t is the theoretical traffic capacity of the junction ramp converging into the main line, and is determined based on the number of lanes of the junction ramp of the expressway; η is the influence coefficient of the junction ramp converging into the main line, and is usually 0.97.
As a preferred embodiment, other means are employed to mitigate mainline traffic congestion after highway hub node canalization strategies are closed.
A second object of the present invention is to provide a highway junction channeling management and control strategy determining system, comprising:
front-end equipment, including highway equipment for collecting highway traffic flow data;
The data processing module comprises a data acquisition unit and a data storage unit, wherein the data acquisition unit acquires data from front-end equipment, and comprises hub ramp flow Q r and main line flow Q m; the data storage unit stores the collected data;
The policy management and control decision module comprises a threshold value calculation unit, a threshold value storage unit and a management and control decision unit, wherein the threshold value calculation unit calculates a first threshold value S and a second threshold value S' as follows:
The threshold storage unit stores the calculated threshold, wherein C m is the actual traffic capacity of the main line, and C r is the traffic capacity of the junction ramp entering the main line;
The control decision unit is used for controlling the opening and the releasing of the highway junction node channeling strategy based on the data stored by the data storage unit:
When (when) When the expressway junction node channeling strategy is started, expressway junction node channeling facilities are arranged and management and control information is distributed;
And after the time delay T, executing node canalization strategy removal judgment: when (when) Or/>Removing the canalization strategy of the junction node of the expressway, and removing the laid facilities;
And the management and control information release module is used for releasing corresponding management and control information at the upstream of the node canalization according to the decision released by the management and control decision unit.
As a preferred embodiment, the data processing module further includes a data processing unit, and the data processing unit performs error correction and denoising processing on the acquired data; the data storage unit also stores the data processed by the data processing unit.
As a preferred embodiment, the control information issuing module sets a control information issuing point based on the flow of the junction ramp when issuing the control information.
Further, for ramps with traffic flows smaller than a preset threshold, the control information is issued at a distance L from the lane reduction position, wherein L is a preset distance; and for the ramp with the traffic flow larger than the preset threshold value, the control information is sent out at the ramp entrance.
The method fully considers the flow, the main line speed and the hub ramp speed of the hub ramp, determines the opening and closing conditions of the hub ramp canalization strategy under the condition of ensuring no traffic jam to the main line, judges the congestion trend according to the flow and the speed of the hub and the main line, pre-opens the hub ramp canalization strategy, timely releases the canalization strategy when the traffic jam cannot be effectively relieved by the canalization strategy according to the control effect of the strategy, adopts other means, ensures the implementation effectiveness of the hub ramp canalization strategy, relieves the traffic jam of the main line and improves the traffic efficiency of the main line.
Drawings
FIG. 1 is a schematic diagram of the technical route of the present invention.
FIG. 2 is a diagram of a junction ramp channeling scheme of the present invention.
Fig. 3 is a system configuration diagram of the present invention.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and specific embodiments.
Example 1
This example illustrates in particular the implementation of the method of the invention.
In an embodiment, the period of data collection and threshold comparison may be set according to actual needs.
The invention relates to a method for determining a highway junction node channeling management and control strategy, which comprises the following specific implementation steps:
(1) The highway junction node traffic running state sensing data acquisition comprises the flow Q r of a junction ramp, and the unit: pcu/h, main line flow Q r, units: pcu/h, main line speed M s, units: km/h, hub ramp speed R s, units: km/h.
(2) According to the number of lanes of the highway junction ramp, searching related technical standards, determining theoretical traffic capacity C t of the junction ramp, determining a correction coefficient eta of the influence of the total characteristics of a driver on the flow rate by adopting traffic flow rates and speeds of investigation working days and rest days in the field according to the area of the junction ramp, determining traffic capacity C r of the junction ramp entering a main line, considering that the traffic volume of an entering area reaches the theoretical traffic capacity condition of the road section after the traffic volume of the junction ramp enters, and starting a channeling strategy of junction nodes of the highway at the moment, wherein the main line threshold value of the strategy opening is
(3) When the ratio of the sum of the flow Q r of the junction ramp and the main line flow Q m to the actual main line traffic capacity C m is greater than the main line threshold valueAnd opening the highway junction node canalization strategy.
(4) The facilities needed for road section node traffic canalization are mainly temporary water horses or isolation piles, so that facilities are prepared before the strategy is implemented, the main line speed M s and the junction ramp speed R s are determined according to main line and ramp sensing equipment, the average acceleration value a of vehicles in the area is obtained through an on-site investigation mode, the length mu of the gradient section of the broadening section of the junction ramp of the expressway is determined through the expressway water horses or isolation piles layout specification, and the layout length of the junction node canalization facilities of the expressway is determined
(5) After the expressway junction ramp channeling strategy is implemented, the traffic capacity of junction ramp entering a main line is halved to be C r/2, at the moment, if the traffic capacity of junction ramp entering reaches the actual traffic capacity of the main line, the strategy can not effectively relieve traffic jam, the saturation is the upper boundary of the implementation of the strategy, the expressway junction node channeling strategy is closed, and the main line threshold value of strategy closing is
(6) Data acquisition through the flow Q r of the junction ramp and the main line flow Q r, whenOr/>When the highway junction node canalization strategy should be closed,/>When the strategy can not meet the effect of relieving traffic jam of the main line, other means such as variable speed limit of the main line, emergency lane opening and the like are needed to be adopted to improve the traffic efficiency of the main line.
In addition, according to policy implementation, when node canalization policies are just started to be executed, the node canalization policies immediately appearTherefore, the node canalization strategy releasing judgment is executed after the delay time T is set in the system, and the delay time T is set to be at least 1h according to practical experience.
Example 2
This embodiment specifically illustrates an implementation of the system of the present invention.
The highway junction node canalization management and control strategy determining system shown in fig. 1 comprises front-end equipment, a data processing module, a strategy management and control decision module and a management and control information issuing module.
The front-end equipment comprises highway equipment for collecting highway traffic flow data and is used for providing traffic perception data required by the system.
The data processing module comprises a data acquisition unit, a data processing unit and a data storage unit, wherein the data acquisition unit acquires data from front-end equipment, and the data acquisition unit comprises hub ramp flow Q r and main line flow Q m; the data processing module further comprises a data processing unit, and the data processing unit performs error correction and denoising processing on the acquired data; the data storage unit is used for storing the data processed by the data processing unit; the data storage unit stores the collected and processed data. Dynamic traffic data varies with road and time factors, has a high degree of uncertainty or randomness, and therefore is subject to a large amount of error and noise. The data processing unit can perform quality analysis on traffic data, construct corresponding time sequence interpolation, historical database interpolation, spatial position interpolation and other treatment models according to different data quality problems, and reject outliers and other methods, so as to perform deficiency compensation, error correction, noise removal and the like on the data, thereby improving the traffic data quality.
The policy management and control decision module comprises a threshold value calculation unit, a threshold value storage unit and a management and control decision unit, wherein the threshold value calculation unit calculates a first threshold value S and a second threshold value S' as follows:
The threshold storage unit stores the calculated threshold, wherein C m is the actual traffic capacity of the main line, and C r is the traffic capacity of the junction ramp entering the main line;
The control decision unit is used for controlling the opening and the releasing of the highway junction node channeling strategy based on the data stored by the data storage unit:
When (when) When the expressway junction node channeling strategy is started, expressway junction node channeling facilities are arranged and management and control information is distributed;
When (when) Or/>Removing the canalization strategy of the junction node of the expressway, and removing the laid facilities;
And the management and control information issuing module issues corresponding management and control information at the upstream of node canalization according to the decision issued by the management and control decision unit. And when the control information release module releases the control information, the control information release point is set based on the flow of the junction ramp. For ramps with traffic flow smaller than a preset threshold, the control information is issued at a distance L from the lane reduction position, wherein L is a preset distance; and for the ramp with the traffic flow larger than the preset threshold value, the control information is sent out at the ramp entrance. The preset threshold and the preset distance are determined according to the ramp traffic capacity.
Claims (5)
1. The highway junction channeling control method is characterized by comprising the following steps of:
Collecting traffic running state sensing data of junction nodes of expressway, including junction ramp flow And main line flow/>；
Respectively define first threshold valuesAnd a second threshold/>The following are provided:
；
Wherein, Is the actual traffic capacity of the main line,/>The traffic capacity of the junction ramp junction main line;
When (when) When the expressway junction node channeling is started, expressway junction node channeling facilities are arranged and management and control information is distributed; the deployment length of the highway junction node canalization facility is determined based on the following formula:
；
Wherein, Is the main line speed; /(I)Is ramp speed; /(I)Average acceleration value of the vehicle; /(I)The length value of the gradual change section of the width expanding section of the junction ramp is set;
And after the time delay T, executing node canalization cancellation judgment: when (when) When the highway junction node is in the canal state, removing the laid facilities; t is more than or equal to 1h.
2. The method of claim 1, wherein the junction ramp enters the traffic capacity of the main lineThe determination is based on the following formula:
；
Wherein, The theoretical traffic capacity for the junction ramp to sink into the main line is determined based on the number of lanes of the expressway junction ramp; /(I)Is a correction coefficient; and the correction coefficient is determined according to the area where the junction ramp is located and based on the traffic flow rate and the traffic speed of the on-site investigation workday and the rest day.
3. A highway junction channeling management and control system, comprising:
front-end equipment, including highway equipment for collecting highway traffic flow data;
the data processing module comprises a data acquisition unit and a data storage unit, wherein the data acquisition unit acquires data from front-end equipment, and comprises hub ramp flow And main line flow/>; The data storage unit stores the collected data;
The strategy control decision module comprises a threshold calculation unit, a threshold storage unit and a control decision unit, wherein the threshold calculation unit calculates a first threshold And a second threshold/>The following are provided:
；
The threshold storage unit stores a calculated threshold, wherein, Is the actual traffic capacity of the main line,/>The traffic capacity of the junction ramp junction main line;
the control decision unit is used for controlling the opening and the releasing of the canalization of the highway junction node based on the data stored by the data storage unit:
When (when) When the expressway junction node channeling is started, expressway junction node channeling facilities are arranged and management and control information is distributed; the deployment length of the highway junction node canalization facility is determined based on the following formula:
；
Wherein, Is the main line speed; /(I)Is ramp speed; /(I)Average acceleration value of the vehicle; /(I)The length value of the gradual change section of the width expanding section of the junction ramp is set;
And after the time delay T, executing node canalization cancellation judgment: when (when) When the highway junction node is in the canal state, removing the laid facilities; t is more than or equal to 1h;
And the management and control information release module is used for releasing corresponding management and control information at the upstream of the node canalization according to the decision released by the management and control decision unit.
4. The system of claim 3, wherein the data processing module further comprises a data processing unit that performs error correction and denoising processing on the collected data; the data storage unit also stores the data processed by the data processing unit.
5. The system of claim 3, wherein the management and control information distribution module sets a management and control information distribution point based on the hub ramp flow size when the management and control information is distributed; for the ramp with the traffic flow smaller than the preset threshold, the control information is issued at a preset distance from the lane reduction position; and for the ramp with the traffic flow larger than the preset threshold value, the control information is sent out at the ramp entrance.
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