Train Arrival Time Targeting via Dynamic Speed Control
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Solution Overview
Problem
Existing railway systems lack an effective method to ensure accurate arrival times at target locations, as current Positive Train Control (PTC) systems primarily focus on speed enforcement rather than time-based targeting, failing to account for changes in acceleration or deceleration and not providing adequate warning and preemption times for trains at crossings.
Innovation Solution
An arrival time and location targeting system that uses a computer-implemented method to generate time-based targets for trains, allowing for variable speed adjustments based on iterative algorithms, and automatically enforces braking actions to ensure safe arrival times at target locations, such as crossings, by determining the required and estimated times of arrival and adjusting the target speed accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If speed enforcement is used as the primary control method, then train safety is maintained through braking predictor curves, but arrival time precision deteriorates because the system cannot account for changes in acceleration or deceleration
Solution Approach 1:
The system transitions from static speed limits to dynamic time-based targets that continuously adjust based on real-time train position, speed, and acceleration data. The targeting algorithm dynamically recalculates required arrival times and speed profiles, allowing the train to change speeds as long as target time or location is met, thereby achieving both safety and time precision.
Solution Approach 2:
The system implements continuous feedback by monitoring actual train position and speed against predicted arrival times, adjusting target speeds based on real-time deviations. The iterative algorithm uses feedback from acceleration and deceleration changes to refine future targeting predictions, ensuring accurate arrival times while maintaining safety through ongoing correction.
2Reliability
If fixed speed limits are enforced at crossings, then safety is ensured through predetermined speed targets, but warning and preemption times are insufficient because the system does not account for changes in acceleration or deceleration
Solution Approach 1:
The system performs preliminary calculations of required arrival times and target speeds based on current train state and distance to crossing. By predicting future position and speed using acceleration data, the system proactively sets appropriate warning times before the train reaches the crossing, ensuring adequate preemption time while maintaining safety through iterative algorithm adjustments.
3Measurement precision
If time-based targeting is implemented, then arrival time precision is improved by allowing variable speed adjustments, but system complexity increases due to iterative algorithms and real-time calculations
Solution Approach 1:
The iterative targeting algorithm serves multiple functions simultaneously: it calculates target speeds, predicts arrival times, determines required acceleration/deceleration, and provides advisory prompts. By consolidating these functions into a single integrated control loop, the system achieves precise time-based targeting without proportionally increasing overall system complexity.
Data Source
AI summary
An arrival time and location targeting system for a train, the system including at least one computer programmed or configured to: (a) receive at least one target location associated with a forward route of the train; (b) determine required time of arrival at the at least one target location based at least partially on the current location of a leading edge of the train; (c) determine an estimated time of arrival of the leading edge of the train at the at least one target location based at least partially on the current location of the leading edge of the train and the current speed of the train; and (d) based at least partially on the difference between the determined required time of arrival and the determined estimated time of arrival, generate a target speed of the train. A computer-implemented arrival time and location targeting method is also provided.