Virtual Block Rail Control with Health Checks and Mode Switching
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Solution Overview
Problem
Conventional railroad block signaling systems face limitations in increasing track capacity without additional infrastructure and cannot identify broken rails within occupied blocks, leading to inefficiencies and potential hazards due to false positives in virtual block systems.
Innovation Solution
A system that operates in long block mode by default, analyzing virtual block health through specialized algorithms to determine the true status of virtual blocks, transitioning to virtual block mode only when confident in their health, thereby leveraging existing infrastructure to enhance safety and capacity without requiring upgrades to onboard systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If virtual block systems operate with fine granularity to increase track capacity, then productivity is improved, but reliability deteriorates due to false positives and health issues at the virtual block level
Solution Approach 1:
The system performs preliminary health checks on virtual blocks before allowing trains to operate through them. The control system monitors rail resistance and other parameters in advance to verify virtual block health, preventing false positives from causing unnecessary train slowdowns while maintaining fine granularity for capacity optimization
Solution Approach 2:
The patent introduces an intermediary verification layer between the virtual block status and train control decisions. The system uses rail resistance measurements and health status indicators as intermediary checks to validate whether virtual block occupancy readings are genuine or false positives, thereby resolving the reliability issue while preserving productivity benefits
2Reliability
If the system operates in long block mode by default, then reliability is improved through coarse granularity, but productivity decreases due to reduced track capacity utilization
Solution Approach 1:
The system dynamically switches between long block mode and virtual block mode based on real-time health status verification. When virtual blocks are confirmed healthy through preliminary checks, the system transitions to virtual block mode for fine granularity and high capacity. When health status is uncertain or false positives are detected, it reverts to long block mode for reliability, thus resolving the contradiction between safety and capacity
3Productivity
If virtual block mode is activated without health verification, then productivity increases through fine granularity, but harmful factors increase due to false positives causing unnecessary train slowdowns
Solution Approach 1:
The system performs preliminary health verification of virtual blocks before activating virtual block mode. By checking rail resistance, occupancy status, and other parameters in advance, the system prevents false positive occupancy signals from causing harmful train slowdowns, thereby eliminating the harmful factor while preserving productivity benefits
Solution Approach 2:
The system implements continuous feedback monitoring of virtual block health status and occupancy readings. When false positives are detected through feedback from rail resistance measurements or inconsistent occupancy data, the system adjusts its operation to prevent harmful slowdowns, thus eliminating the harmful factor while maintaining operational efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach increases railroad track capacity and safety by reducing unnecessary train slowdowns, maintaining efficient operations, and minimizing maintenance costs while utilizing existing Positive Train Control systems.
Implementation Method 1
Moving high density block systems transmit voltage and current down a rail to measure rail resistance
Implementation Method 2
the axel connecting two wheels effectively shunt the rail circuit, such that the shunt can be used to determine where a train is located with the measured physical blocks
Data Source
AI summary
A system and method for virtual block operational status control with long block time delay is presented. The present disclosure can advantageously increase the capacity and safety of the existing railroad track infrastructure used by the railroads by determining whether a virtual block is healthy or unhealthy. The long block mode can provide a coarse granularity on the presence of a train. In virtual block mode, the system can implement a finer granularity so the virtual aspects of the sub blocks can be realized. The present disclosure provides a long block mode that can provide the system an opportunity to analyze the potential tradeoffs between granularity and reliability by determining which mode (virtual block or long block) is best utilized in a given situation. The system can operate by default in long block mode and ignore the virtual block capabilities until absolutely needed.