3D Time-Space Diagram for Regional Green-Wave Visualization
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Solution Overview
Problem
Current methods for evaluating the regional green-wave coordinated control effect in traffic signal control systems rely on two-dimensional time-space diagrams, which are insufficient for comprehensively showing the advantages and disadvantages of traffic signal coordinated control, limiting the ability to observe and optimize the overall control effect.
Innovation Solution
A plotting method for a three-dimensional time-space diagram is developed, which involves selecting a benchmark intersection, establishing a coordinate system, calculating green starting and ending points for each signal phase, and determining green-wave bandwidths in both upbound and downbound directions to visualize the entire regional traffic signal coordinated control effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a two-dimensional time-space diagram is used to show green-wave coordinated control effect, then the diagram is simple and easy to understand, but it cannot comprehensively show the advantages and disadvantages of regional traffic signal coordinated control
Solution Approach 1:
The patent transitions from a two-dimensional time-space diagram to a three-dimensional time-space diagram by adding a vertical dimension representing green-wave bandwidth. This dimensional change enables comprehensive visualization of regional coordinated control effects, showing both temporal and spatial characteristics simultaneously while providing additional depth through the vertical dimension that indicates control effectiveness.
2Loss of information
If a three-dimensional time-space diagram is used to comprehensively show regional coordinated control effect, then the visualization capability is improved, but the diagram complexity and difficulty of observation increase
Solution Approach 1:
The patent segments the three-dimensional time-space diagram into multiple two-dimensional cross-sections at different heights, each representing a specific green-wave bandwidth level. This segmentation allows observers to analyze the coordinated control effect at different depths by examining individual cross-sections, making the complex three-dimensional data more manageable and easier to interpret systematically.
3Measurement precision
If green-wave bandwidth is calculated for both upbound and downbound directions, then the comprehensive control effect is fully captured, but the calculation complexity increases
Solution Approach 1:
The patent employs a unified calculation methodology that handles both upbound and downbound directions using the same fundamental principles and formulas. This universal approach allows the system to comprehensively evaluate coordinated control effects in multiple directions while maintaining calculation consistency and reducing overall complexity through standardized procedures.
Data Source
AI summary
The invention discloses a plotting method for a three-dimensional time-space diagram showing a regional green-wave coordinated control effect. The plotting method includes the following steps: establishing a coordinate system of the three-dimensional time-space diagram; determining a specific position coordinate of each intersection in the coordinate system of the three-dimensional time-space diagram; generating a time prism of a signal timing plan of each intersection; determining a green-wave bandwidth of each arterial road; and generating a driving trajectory between the intersections, and making a green-wave band of each arterial road, and completing plotting.