Intersection traffic stream modeling and self-adaption control method and system

Abstract

The invention provides an intersection traffic stream modeling and a self-adaption control method and a system. The method comprise steps of perceiving driving-in and driving-out facts, driving-in and driving-out time, numbers of driving-in vehicles at all entrances, numbers of vehicles going straight at the entrances, driving-out and numbers of vehicles at left-handed turning exits of vehicles at all entrances and exits in a signal period; calculating average delay time of the vehicles passing the entrances and the exits of the intersection according to the driving-in and driving-out facts and time; calculating vehicle queuing length according to numbers of driving-in and driving-out vehicles; establishing a traffic stream digital module of the intersection by taking the average delay time of traffic streams in the entrance directions as discrete state variables, taking green time in corresponding direction as control variables, and taking queuing lengths in all directions as output variables; and performing real-time control for the traffic stream digital module by use of the self-adaption control method. The system corresponds to the method. The method and the system are advantaged by long service lifetime, easy maintenance and precise control of traffic signals.

Description

technical field [0001] The invention belongs to the field of urban road traffic management, and in particular relates to a vehicle flow modeling and self-adaptive control method and system at an intersection. Background technique [0002] The bottleneck of urban road traffic is a large number of level intersections, because there are many spatial conflict points in the trajectories of traffic flows in all directions at the intersections. The measure to eliminate the spatial conflict point of the traffic flow trajectory at the intersection is to adopt the widely used traffic signal light control method to separate the traffic flow in time and space, and exchange time for space, so that the traffic flow in each direction can use the intersection in time-sharing, so as to achieve safe passage. the goal of. From the perspective of automatic control, there are two ways of traffic signal control: open-loop control and closed-loop control. [0003] Traffic signal open-loop contro...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method and system for traffic flow modeling and self-adaptive control at an intersection, aiming at solving the problem that in the traditional traffic signal control system, the average delay of traffic flow in each entrance direction cannot be measured in real time, and the measurement of the queuing length of traffic flow Inaccurate, unable to implement traffic signal control based on traffic flow model

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