Distribution-type four-stage structure traffic signal control system

Abstract

Distributed traffic signal control system structured in four stages includes central control stage as first level, regional control stage as second level, key road junction control stage as third level. Characters are that road junction control stage or extended virtual road junction control stage as fourth level is setup under the third level. Main device is central controlling machine in the central control stage. Main device is regional controlling machine in the regional control stage in charge of coordinated controlling key road junction controlling machine. Main device is key road junction controlling machine in the key road junction control stage in charge of coordinated controlling road junction controlling machines or virtual road junction controlling machines. Main device is road junction controlling machine in charge of controlling traffic light on/off in road junction. Virtual road junction controlling machine exists in software logically, and does not exist physically.

Description

technical field [0001] The patent of the present invention relates to a distributed four-level structure traffic signal control system and method applied to the regional road network. Background technique [0002] At present, the coordinated traffic signal control system of the regional road network generally adopts a traffic signal control system with a centralized secondary structure or a semi-distributed tertiary structure. Among them, the typical representative of the traffic signal control system with centralized secondary structure is the SCOOT system in the UK. The control structure is as follows: figure 1 shown. The system is divided into two levels of central control and intersection control. The main equipment of the central control level is the central control machine, and the main equipment of the intersection control level is the intersection control machine, which is directly connected to the central control machine through optical fiber or cable communicatio...

AI Technical Summary

Problems solved by technology

[0007] Although the central control machine and the regional control machine of this semi-distributed control structure system share the tasks, the regional control machine still needs to coordinate and control dozens or even hundreds of intersection control machines at the same time. Analyzing and processing a large amount of vehicle arrival information, and a large amount of optimization calculation work is required to dynamically determine the control parameters such as cycle length, green light time ratio and green light start time difference. The real-time processing speed and work requirements of the regional controller are still relatively large. High requirements on hardware environment and communication lines, equipment investment and communication costs are still high

Images