Railcar Order Identification via Brake Pipe and Wireless Messaging
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Solution Overview
Problem
Existing methods for determining the sequence of railcars connected to a locomotive on a train face challenges when multiple trains are in close proximity, leading to incorrect identification of railcars, and require electrical communication connections that may not be feasible when some railcars are not equipped with control devices.
Innovation Solution
A method using a brake pipe as a slow network for transmitting a unique identification code and a fast wireless network for message exchange, allowing railcars to respond only to locomotives with a matching code, and calculating distances based on time delays and propagation velocity, even when some railcars lack control devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS positioning is used to determine car order, then the order of railcars can be determined, but the method only works when the train is standing still and requires complex triggering sequences
Solution Approach 1:
The patent replaces the mechanical/pneumatic brake test system with an electronic communication system. The control device transmits identification codes and position information electronically through the brake pipe network, eliminating the need for complex pneumatic pressure variation sequences and GPS positioning requirements. This allows car order determination to work dynamically during train operation.
Solution Approach 2:
The patent introduces an electronic message transmission system as an intermediary between the locomotive control device and railcar control devices. This intermediary enables direct electronic communication through the existing brake pipe infrastructure, replacing the need for external GPS systems and complex triggering mechanisms while maintaining accurate car order determination.
2Reliability
If brake test is carried out to determine continuity, then the pneumatic brake pipe continuity can be tested, but the method does not provide unique identification of connected railcars
Solution Approach 1:
The patent segments the identification information into unique identification codes that are transmitted individually to each railcar control device. This allows the system to not only verify brake pipe continuity but also to uniquely identify and differentiate between multiple connected railcars, preventing information loss about individual car identities.
Solution Approach 2:
The electronic message transmission system acts as an intermediary that carries both continuity verification data and unique identification codes simultaneously. This resolves the contradiction by enabling both functions through a single communication channel without losing identification information.
3Measurement precision
If time between pressure change and arrival effect is measured, then car order can be determined, but the method requires the train to be standing still and does not work with multiple trains in proximity
Solution Approach 1:
The patent replaces the pressure-based mechanical measurement system with an electronic communication system that transmits identification codes and position data. This substitution allows the system to determine car order dynamically during train movement and distinguishes between multiple trains by using unique identification codes, greatly increasing operational flexibility.
Solution Approach 2:
The patent changes the measurement parameter from pressure propagation time to electronic signal transmission time combined with unique identification codes. This parameter change enables the system to differentiate between multiple trains in proximity and to operate under various dynamic conditions rather than requiring the train to be stationary.
4Speed
If electrical communication connection is used, then fast message exchange is possible, but the method is not feasible when some railcars are not equipped with control devices
Solution Approach 1:
The patent makes the brake pipe network serve multiple functions: it continues to provide pneumatic brake control while simultaneously serving as a communication medium for electronic message transmission. This universality allows the system to achieve fast communication speeds while remaining compatible with existing railcars that may not have additional control devices, as the communication utilizes the existing brake pipe infrastructure.
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
Ensures accurate identification of connected railcars, even in proximity to other trains, and accommodates railcars without control devices, by using pressure variations in the brake pipe for encoding and wireless communication.
Implementation Method 1
transmitting, by the control device of the locomotive of a unique identification code to the control devices via a slow network constituted by the brake pipe
Implementation Method 2
determining, by the control devices, of a time delay between the state of the transmission received from the control device and a state of the transmission measured on the slow network; calculating a distance of each railcar to the locomotive from the time delay and a propagation velocity of the slow network
Data Source
AI summary
A method and equipment for determining a sequence of railcars connected to a locomotive on a train, wherein a control device of the locomotive is connected to railcars including a control device via a brake pipe, wherein the control device of the locomotive and the control devices of the railcars may exchange messages via a fast wireless network, wherein the method and equipment transmit a unique identification code via a slow network constituted by the brake pipe, transmit over a fast network messages indicative of a current state of the transmission carried out via the slow network, determining a time delay between the received state of transmission and a measured state of transmission and generating and sending associated report data.