Regional Dynamic Perimeter Control for Boundary Link Overflow Prevention
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Solution Overview
Problem
Existing regional perimeter control methods fail to effectively prevent queuing overflow of boundary links, leading to congestion diffusion to upstream intersections.
Innovation Solution
A regional dynamic perimeter control method and system that dynamically divides boundary links based on traffic flow information, uses Kalman filtering to estimate queuing vehicles, and adjusts input flow through Macroscopic Fundamental Diagram (MFD) modeling to maintain regional accumulation near critical values, implementing flow interception and drainage control strategies to optimize signal timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If regional perimeter control is implemented using macroscopic traffic flow modeling, then regional traffic congestion can be controlled and flow operation efficiency can be improved, but the problem of queuing overflow of boundary links cannot be effectively solved and may cause congestion to diffuse to upstream intersections
Solution Approach 1:
The patent segments the boundary links into two distinct sets: boundary link set I(t) with sufficient available storage space and boundary link set Ī(t) with insufficient available storage space. This segmentation allows differential control strategies to be applied to different boundary links based on their specific storage conditions, preventing queuing overflow while maintaining overall regional flow efficiency.
Solution Approach 2:
The patent implements dynamic perimeter control by continuously adjusting the green signal ratio of boundary intersections based on real-time traffic flow information and predicted accumulation. The control strategy adapts to changing traffic conditions by dynamically modifying signal timing parameters, ensuring that boundary links maintain optimal storage levels without overflow while maximizing regional throughput.
2Reliability
If flow interception and drainage control strategies are applied to dynamically adjust input flow of boundary intersections, then regional accumulation can be maintained near critical value and overflow probability reduced, but system complexity increases
Solution Approach 1:
The patent employs feedback control by using predicted accumulation and regional accumulation deviation as input to dynamically adjust the green signal ratio of boundary intersections. The system continuously monitors traffic flow information, compares predicted accumulation against critical accumulation values, and adjusts signal timing accordingly to maintain boundary link storage near critical levels, preventing overflow while managing system complexity through systematic feedback loops.
Data Source
AI summary
A regional dynamic perimeter control method and system for preventing boundary links queuing overflow. The method includes: estimating the number of queuing vehicles of boundary links using a Kalman filtering extension method using traffic flow information, and calculating a maximum of receivable vehicles; dividing the boundary links utilizing an estimated number of each boundary link's queuing vehicles and the maximum number of receivable vehicles obtaining a boundary link set with sufficient storage and a boundary link set with insufficient storage; obtaining a critical accumulation of a region according to a preset Macroscopic Fundamental Diagram (MFD) model of the region, and predicting the estimated region accumulation in a sampling period; and controlling a regional boundary intersection traffic flow operation using a deviation between the predicted and critical accumulation and boundary link sets. Deterioration of regional traffic flow is avoided, and the probability of overflow of boundary links is reduced.