Mass Transit Vehicle Pacing With Adaptive Priority Requests
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Solution Overview
Problem
Current traffic control systems for mass transit vehicles lack the ability to adapt to real-time traffic flows across multiple intersections, leading to schedule deviations and issues like bunching, and require additional hardware upgrades for sophisticated schedule-adherence systems.
Innovation Solution
A system utilizing priority detector units and a vehicle control unit (VCU) that determines schedule adherence by comparing actual arrival times to target times, enabling or disabling priority requests based on corridor timing zones and waypoint pairs, without requiring vehicle hardware upgrades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional timer-based traffic control systems are used, then the system is simple to operate, but the system cannot adapt to real-time traffic flows causing schedule deviations
Solution Approach 1:
The system implements feedback by continuously monitoring the mass transit vehicle's actual position and travel time through detectors at multiple intersections, comparing real-time data against the published schedule, and dynamically adjusting signal phases based on the calculated schedule adherence status. This closed-loop feedback mechanism enables the system to adapt to real-time traffic conditions while maintaining operational simplicity through automated decision-making algorithms.
2Reliability
If sophisticated schedule-adherence systems with vehicle-computer integration are implemented, then schedule adherence is improved, but hardware costs and complexity increase
Solution Approach 1:
The system enables the existing VCU to serve itself by providing schedule adherence functionality through software-based timing zone evaluation and automatic priority request control. The VCU independently determines whether to request transit signal priority by comparing actual travel time against expected travel time through virtual detectors, eliminating the need for additional specialized hardware or complex vehicle-computer integration while maintaining reliable schedule adherence.
3Reliability
If priority requests are continuously enabled, then the vehicle can maintain schedule adherence, but traffic congestion and energy consumption increase
Solution Approach 1:
The system dynamically controls the VCU's priority request functionality by enabling it only when the mass transit vehicle enters a timing zone and is determined to be behind schedule. The system adjusts the operational state of priority requests in real-time based on the vehicle's actual performance relative to the published schedule, rather than maintaining a static enabled state. This dynamic approach maintains schedule adherence when needed while reducing unnecessary energy consumption and traffic disruption when the vehicle is on schedule.
Data Source
AI summary
Systems and methods that allow use of simple priority VCUs (those that can only request an increased priority) to operate in a manner that simulates much more sophisticated schedule-adherence or ETA-type traffic control systems without the need to upgrade vehicle hardware. Instead, tracking of the vehicle, whether provided by other systems or by the VCU operating in conjunction with certain prepared points or zones is used to determine if the VCU equipped vehicle is ahead or behind schedule and operation of the VCU itself is altered to modify the expected arrival time of the vehicle.