Distributed traffic signal phase difference control structure and adjustment method

Abstract

The invention provides a distributed traffic signal phase difference control structure and a phase difference adjustment method. Two functions of phase difference optimal computation and phase difference adjustment are separated, the phase difference optimal computation is completed by a central computer, the phase difference adjustment relevant to the state of each road junction is completed in a local road junction traffic signal controller, a phase difference adjuster is internally installed in each traffic signal controller, a phase difference generator of the central computer figures out target phase difference of each road junction, then the phase difference generator sends each target phase difference to the traffic signal controller of each road junction, and the traffic signal controllers of road junctions concurrently perform phase difference adjustment computation according to the current phase differences. The distributed traffic signal phase difference control structure and the phase difference adjustment method have the advantages that the central computer can be concentrated on acquisition of optimal phase difference, the phase difference generating algorithm can be carefully selected and optimized, the computing power of numerous road junction controllers can be fully utilized, and simultaneously the autonomous decision-making and autonomous control capabilities of road junctions are enhanced.

Description

technical field [0001] The invention provides a distributed traffic signal phase difference control structure and adjustment method, belonging to the technical field of road traffic signal control. Background technique [0002] Road traffic signal control (traffic light control) is an important technical means to ensure the safety and smoothness of road traffic. Signal cycle (Cycle), green signal ratio (Split) and phase difference (Offset) are the three basic timing parameters for coordinated control of traffic signals . Reasonable signal period length and green-to-signal ratio are the key factors to reduce green light loss time and parking delay at single intersections, while phase difference control is the most important control parameter to realize coordinated control among multiple intersections, reduce parking times and parking delays. [0003] The phase difference is also called the starting time of the green light, which refers to the time difference (unit: second) b...

AI Technical Summary

Problems solved by technology

Since the phase difference adjustment and optimization processes are all completed in the central computer, when the number of controlled intersections is large, the central computer has a large overhead, which restricts the further expansion of the system scale

[0009]2) Slow response

Centralized control structures are slow to respond due to the overhead of computing and communication resources

[0010]3) prone to adjustment fluctuations

The fluctuation here refers to the repeated phase difference during the adjustment process, for example, from the phase difference of -10 to 30. The ideal adjustment plan should be that the current phase difference increases monotonously from -10 to 30, but there may be -5, 10, The adjustment process of 0, 10, and 15 has repeated, which slows down the speed of phase difference adjustment

[0011]4) Poor adjustment accuracy

Due to the above fluctuations, sometimes the target phase difference cannot be accurately achieved

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