Urban expressway entrance ramp control method

A control method and expressway technology, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problem of vehicle congestion on the main line of urban expressway

Inactive Publication Date: 2018-03-06
HENAN POLYTECHNIC UNIV
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  • Abstract
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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a method for controlling the entrance ramp of urban expressway to alleviate the problem of vehicle congestion on the main line of urban expressway caused by the uncertain state of traffic flow on urban expressway

Method used

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  • Urban expressway entrance ramp control method
  • Urban expressway entrance ramp control method
  • Urban expressway entrance ramp control method

Examples

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Embodiment

[0078] Such as figure 1 As shown, a control method for the on-ramp of an urban expressway, when E L less than the activation threshold E NOS or E NHS When , use local control; when E L Greater than the activation threshold E NOS or E NHS When , adopt coordinated control;

[0079] Among them, E L It is a function to divide the main and secondary ramps according to the entrance ramp occupancy rate and the entrance ramp queue length. It is used to determine the location and quantity of the ramps that need to be coordinated and controlled when there is a bottleneck on the urban expressway. Its expression is:

[0080]

[0081] Among them: E N is the relative queuing length of ramp j, E O is the ratio of occupancy rate downstream of entrance ramp j to critical occupancy rate, A(k-1) is a correction parameter, and its value is mainly affected by vehicles stranded on the ramp in the previous cycle, for E N ,E O The sum of the values ​​of A(k-1) and A(k-1); is the rati...

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Abstract

The invention provides an urban expressway entrance ramp control method, which comprises the steps of predicting an entrance ramp downstream dynamic critical occupation rate under an uncertain trafficflow state through ESN; and then designing a function used for dividing principal and subordinate ramps, dynamically determining the number of ramps required to be coordinated according to the function, and expanding the coordinated control range, wherein the function dynamically changes along with the time, and influences are imposed on a value of the function by road traffic accidents, weatherand the like, so that a BP neural network is utilized to perform training on the function when the function is design so as to improve the accuracy thereof. According to the algorithm, the ramp regulation rate is designed by taking the entrance ramp downstream dynamic critical occupation rate as a basis, the coordinated control range is dynamically determined according to the designed function soas to adapt to changes in actual traffic flow state of the expressway principal line, defects of the Bottleneck algorithm, the Linked-control algorithm and the Swarm algorithm are overcome, and the congestion duration time and the high density duration time of the urban expressway principal line in traffic flow operation are obviously reduced.

Description

technical field [0001] The invention relates to the technical field of urban traffic control, in particular to a method for controlling an urban expressway entrance ramp. Background technique [0002] With the growth of car ownership on urban expressways, the uncertainty of traffic flow status increases, leading to the increasingly serious problem of vehicle congestion on the main line of urban expressways. The study found that the traffic-sensing ramp regulation control is an effective way to alleviate the main line congestion of urban expressways. Traffic-sensing ramp regulation control uses real-time data measured by sensors installed on the expressway network and ramps to adjust and control the traffic flow on the entrance ramp of the expressway. According to the control range, it can be divided into local ramp regulation control and ramp coordination induction control. Local ramp regulation control utilizes measurements near individual ramps to adjust expressway on-ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 钱伟景辉鑫李冰锋逯静刘海波陶海军
Owner HENAN POLYTECHNIC UNIV
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