Supersaturated traffic intersection optimum-control method based on state space target curve
A target curve, optimal control technology, applied in the control of traffic signals and other directions, can solve the problems of intersection congestion, secondary road overflow, affecting the normal passage of other roads, etc.
Active Publication Date: 2018-02-23
ZHEJIANG UNIV CITY COLLEGE
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But in reality, when the intersection is in an oversaturated state, this method is prone to secondary road overflow when the vehicle inflow fluctuates greatly, which will cause congestion at the intersection and affect the normal traffic of other roads.
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[0070] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. While the invention will be described in conjunction with the preferred embodiments, it will be understood that it is not intended to limit the invention to the described embodiments. On the contrary, the invention is to cover alternatives, modifications and equivalents, which may be included within the scope of the invention as defined by the appended claims.
[0071] 1 Principle overview
[0072] This method first designs an algorithm to measure the transit time and overflow risk of traffic intersections. Based on the shortest transit time and minimum overflow risk, a dual-objective optimization problem is constructed, and an optimal state-space curve can be obtained by solving this problem. Finally, the PID control algorithm is applied to make the queuing state in reality approach this curve infinitely so as to achieve the optimal control effect.
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The invention relates to a supersaturated traffic intersection optimum-control method based on a state space target curve. The supersaturated traffic intersection optimum-control method comprises thefollowing steps that 1, the queuing situations at intersections are acquired through traffic intersection sensors; 2, queuing states of the intersections are transferred to a queuing space, the wholeintersection control problems are converted into queuing theory problems, and current queuing states are calculated; 3, operation is performed according to an established time-risk dual-objective optimization method to obtain target queuing states at a next moment; 4, errors of the queuing states are calculated according to the current queuing states and the target queuing states at the next moment. The supersaturated traffic intersection optimum-control method has the advantages that an overflow risk index is introduced, and supersaturated state duration time is combined to establish the dual-objective optimization problem, namely the shortest supersaturated state duration time and minimum overflow risk are used as objective functions. By adopting the novel control method, the time lengthof traffic lights is controlled by combining with PID control algorithm.
Description
technical field [0001] The invention relates to a method for controlling an oversaturated traffic intersection, in particular to an optimal control method for an oversaturated traffic intersection based on a state space target curve. Background technique [0002] Traditional oversaturated traffic intersections use fixed traffic light time for traffic control, without considering the impact of real-time road conditions on the traffic control system, and cannot reduce the occurrence of congestion with optimal control strategies in real time. At present, a control method combined with real-time road conditions has been proposed. This method is based on collecting real-time road condition information, transforming the signal light control problem into a queuing space solution problem of queuing theory, and designing a time-optimal traffic light control scheme. [0003] The above method will make the secondary road quickly reach the sub-overflow state, and maintain the state by a...
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IPC IPC(8): G08G1/08
CPCG08G1/08
Inventor 刘泓臧泽林朱胜
Owner ZHEJIANG UNIV CITY COLLEGE