Brake Pipe Valve Control for Distributed Power Train Fluid Flow
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Solution Overview
Problem
In distributed power train operations, unexpected brake pipe fluid flow conditions can disrupt the propagation of brake pipe braking indications, leading to longer stopping distances and increased in-train forces due to downstream remote locomotives remaining in a traction state and charging the brake pipe despite a minimum service brake application indication from the lead locomotive.
Innovation Solution
A system that includes a brake control system with a brake pipe valve and a controller, which monitors fluid flow and pressure signals to identify inconsistent conditions, disables the remote locomotive's ability to control brake pipe flow, and reduces traction conditions to prevent interference, ensuring brake pipe braking indications are propagated to downstream remote locomotives without communication checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the remote locomotive charges the brake pipe to correct a perceived leak based on pressure drop, then the brake pipe pressure is restored, but the braking indication from the lead locomotive is disrupted and downstream remote locomotives are not braked
Solution Approach 1:
The system performs preliminary actions by disabling the remote locomotive's brake pipe control ability and reducing traction conditions immediately when an unexpected brake pipe fluid flow condition is detected, before the braking indication can be disrupted. This prevents the remote locomotive from charging the brake pipe and interfering with the propagation of braking commands to downstream units.
Solution Approach 2:
The controller continuously monitors brake pipe fluid flow conditions and uses this feedback to detect unexpected conditions. When a discrepancy is detected between the current brake pipe state and the last commanded state, the system triggers corrective actions to maintain proper braking propagation while preserving the ability to restore normal operation once communication is re-established.
2Reliability
If the remote locomotive maintains last-commanded traction and braking conditions during communication loss, then safety is preserved, but braking response time is delayed when communication is restored
Solution Approach 1:
The system takes preliminary action by immediately disabling brake pipe control and reducing traction when an unexpected fluid flow condition is detected, rather than waiting for communication to be restored. This ensures that braking indications propagate correctly without delay, while still maintaining safe operation through the controller's continued monitoring and the locomotive's ability to respond when communication is re-established.
3Reliability
If the remote locomotive attempts to correct perceived leaks by charging the brake pipe, then pressure is restored, but stopping distance increases and in-train forces increase
Solution Approach 1:
The system applies preliminary anti-action by disabling the remote locomotive's ability to charge the brake pipe when an unexpected fluid flow condition is detected. This prevents the harmful action of charging the brake pipe during a braking event, which would otherwise increase stopping distances and create dangerous in-train forces. The brake pipe valve is controlled to prevent charging while allowing the braking indication to propagate downstream.
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 solution effectively propagates brake pipe braking indications with reduced fluid flow interference, improving braking efficiency and reducing stopping distances by immediately addressing unexpected brake pipe fluid flow conditions, even in the absence of operable radio communications.
Implementation Method 1
A brake application is typically accomplished by venting, or reducing a pressure in the brake pipe. However, brake pipe venting at only the lead locomotive of a train requires propagation of the corresponding brake pipe pressure reduction along the length of the train
Implementation Method 2
modulation of a fluid flow, such as a fluid pressure in the brake pipe, is conventionally used to indicate desired braking operations
Data Source
AI summary
A method of propagating a brake pipe braking command along a fluid carrying brake pipe (14) interconnecting members of a transportation system, the transportation system comprising a communication system (24) for exchanging information between a controlling member of the system and controlled members of the system includes identifying an unexpected brake pipe fluid flow condition at a first controlled member (e.g. 12) of the transportation system inconsistent with a communication system braking command issued by a controlling member of the transportation system. The method also includes disabling an ability of the first controlled member to control a brake pipe flow so that a brake pipe braking command issued by the controlling member is propagated along a brake pipe to a second controlled member of the transportation system downstream of the first controlled member with reduced brake pipe fluid flow interference from the first controlled member.