ECP Helper Locomotive Emergency Brake Control
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Solution Overview
Problem
Existing ECP-equipped trains face challenges in braking safety and prolonged brake system recovery time after a brake pipe emergency dump command, particularly due to sudden air pressure depletion and lengthy recharging processes.
Innovation Solution
A method and system that involve receiving a brake pipe emergency dump command, transmitting an ECP emergency brake request message, and waiting for a predetermined period to receive an ECP HOT brake command before opening the brake pipe dump valve, allowing for controlled brake activation and reduced air depletion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the brake pipe dump valve is opened immediately upon receiving an emergency brake command, then the brakes are applied quickly, but the brake pipe air pressure is depleted suddenly causing prolonged recovery time
Solution Approach 1:
The system performs preliminary action by transmitting the emergency brake command through the ECP network to all locomotives and cars before opening the dump valve. This allows brake application to begin through electronic control while the dump valve is opened later to ensure complete brake application, thereby reducing recovery time while maintaining braking effectiveness.
Solution Approach 2:
The system replaces the traditional mechanical pneumatic brake application method with an electronic control system (ECP). Instead of relying solely on air pressure changes to trigger brakes, the patent uses electronic messages transmitted through the train network to command brake application, allowing for faster and more controlled brake activation without depleting the entire brake pipe air pressure.
2Reliability
If the brake pipe dump valve is opened immediately, then emergency braking is achieved, but in-train forces increase causing excessive wheel and brake wear
Solution Approach 1:
The patent replaces the sudden mechanical pneumatic brake application with a controlled electronic control system. The ECP network transmits emergency brake commands to all locomotives and cars, which then apply brakes in a controlled manner. This substitution of electronic control for direct pneumatic actuation reduces in-train forces and minimizes wheel and brake wear while maintaining emergency braking reliability.
Solution Approach 2:
The system initiates preliminary brake application through electronic commands before opening the dump valve. This allows brakes to be applied gradually and uniformly across the train through electronic control, preventing the sudden force surges that occur with immediate dump valve operation, thereby reducing wear on wheels and brake components.
3Object-affected harmful factors
If a virtual brake pipe connection is used for the helper locomotive, then coupling safety is improved, but brake system control complexity increases
Solution Approach 1:
The patent introduces an intermediary device (radio-based helper equipment) that mediates between the helper locomotive and the train's brake system. This intermediary receives brake commands and transmits them through the ECP network, allowing the helper locomotive to be safely coupled without direct physical brake pipe connection while maintaining integrated brake control through the electronic network.
Solution Approach 2:
The ECP network serves multiple functions: it provides brake control for the main train, extends brake control to the helper locomotive with virtual connection, and manages emergency brake commands. This multi-functionality reduces the need for separate control systems and simplifies the overall brake system architecture despite the virtual connection complexity.
Data Source
AI summary
Methods and systems for control and use in connection with an electronically controlled pneumatic (ECP)-equipped train after transmission of a brake pipe emergency dump command message by a helper locomotive associated with the train. These methods and systems are implemented in an effort to improve braking safety and reduce brake system recovery time of a train.