Train Control System Automatic Braking for Operator Vigilance

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Solution Overview

Problem

Train operators may become complacent due to repetitive 'approach' and 'advance approach' signal indications, leading to reduced vigilance and potential collisions when encountering a 'stop and proceed' signal, as existing train control systems fail to adequately enhance operator vigilance and ensure safe operation in track networks.

Innovation Solution

A train control system with an on-board database and positioning system that automatically brakes the train before an upcoming signal, unless it is safe to proceed, specified authorization is received, or specified train control data is received, thereby preventing collisions and enhancing safety.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If cab signal systems provide cyclical 'approach' and 'advance approach' signal indications to train operators, then train operators can maintain normal operation flow, but operator vigilance decreases leading to potential collisions

Engineering Contradiction:

Improvetrain operation flowVSAvoidoperator vigilance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system continuously monitors train position, signal aspects, and operator actions, providing real-time feedback to the operator through the cab display. The system tracks whether the train is approaching signals at appropriate speeds and alerts the operator if corrective action is needed, creating a closed-loop feedback system that maintains vigilance without disrupting operation flow

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces reliance on human operator vigilance with an automated electronic monitoring system that objectively tracks train position, speed, and signal compliance. This electronic system substitutes for the human operator's attention and decision-making, providing consistent and reliable monitoring regardless of operator fatigue or complacency

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If automatic cab signal systems are implemented in territories equipped with track circuits, then signal indications are provided to train operators, but the systems fail to adequately enhance operator vigilance and ensure safe operation

Engineering Contradiction:

Improvesignal indication provisionVSAvoidsafe operation assurance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system performs preliminary actions by pre-calculating required stopping distances and speeds based on upcoming signal aspects. Before the train reaches a signal requiring a stop, the system has already determined the appropriate braking curve and is preparing the brake system, ensuring safe operation is assured in advance rather than reacting at the last moment

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system provides continuous feedback to the operator about upcoming signals, required actions, and compliance status. This feedback loop ensures the operator is constantly informed about safety-critical information, maintaining awareness and enabling timely corrective actions

Inventive Principle:

Principle #23Feedback

3Productivity

If train operators follow cyclical signal indications without enhanced vigilance mechanisms, then normal train operation is maintained, but collisions may occur when encountering 'stop and proceed' signals

Engineering Contradiction:

Improvetrain operation continuityVSAvoidcollision risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system replaces subjective operator judgment with objective electronic monitoring of train position, speed, and signal compliance. The automated system objectively determines whether the train is approaching a signal at a safe speed and requires a stop, eliminating the harmful factor of operator complacency while maintaining operation continuity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system takes preliminary action by identifying upcoming 'stop and proceed' signals in advance and preparing the brake system accordingly. Before the operator encounters the signal, the system has already calculated the required stopping distance and is ready to enforce the stop, preventing collisions while allowing normal operation to continue

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8478463B2Train control method and system

Publication Date: 2013.07.02 WESTINGHOUSE AIR BRAKE TECH CORP

AI summary

A train control system for controlling trains traveling in a track network including tracks with signals associated therewith. The system includes an on-board track database, a positioning system and an on-board control system. The on-board control system receives position data and automatically brakes the train prior to encountering an upcoming signal based upon specified data points. The train is not automatically braked if certain conditions are met. A method for controlling a train traveling in a track network is also disclosed.