Brake Cylinder Reference Pressure System for Leak Compensation
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Solution Overview
Problem
Current rail car braking systems fail to accurately maintain brake cylinder pressure when a pre-existing leak occurs during pressure charging, leading to ineffective replenishment of lost pressure and force imbalance across the quick service limiting valve diaphragm.
Innovation Solution
A system that uses a valve responsive to brake pipe and auxiliary reservoir pressures to provide a brake cylinder reference pressure, which is fed through a choke and stored in a volume, ensuring the ratio matches the charging valve area to volume, allowing for accurate pressure regulation and communication with the quick service limiting valve or relay to address under- and over-pressurization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake cylinder reference pressure is based on the actual brake cylinder pressure, then the system works well when the brake cylinder develops a leak after full pressurization, but the system fails to achieve the desired target pressure when the brake cylinder has a pre-existing leak during charging
Solution Approach 1:
The patent introduces an intermediary reference pressure system that uses a separate reference chamber and reference pressure valve to generate a target pressure value independent of the actual brake cylinder pressure. This intermediary reference pressure acts as a mediator between the desired target pressure and the actual brake cylinder pressure, allowing the system to detect and correct pressure losses even when pre-existing leaks prevent the brake cylinder from reaching the desired pressure during charging.
2Productivity
If the brake cylinder reference pressure accurately represents the desired target pressure, then the force imbalance opens communication to replenish lost pressure, but the system cannot achieve this when pre-existing leaks prevent reaching the target pressure during charging
Solution Approach 1:
The patent establishes the reference pressure in advance through a separate reference chamber that is charged to the desired target pressure before braking operations begin. This preliminary establishment of the correct reference pressure ensures that when the brake cylinder experiences pressure loss due to leaks, the reference pressure is already set to the correct target value, enabling the force imbalance mechanism to properly activate and replenish pressure without being compromised by pre-existing leaks during the charging process.
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 ensures accurate pressure regulation and effective replenishment of brake cylinder pressure, maintaining the desired target value even with pre-existing leaks, enhancing the system's ability to manage pressure imbalances and prevent under- or over-pressurization.
Implementation Method 1
a valve responsive to a source of brake pipe pressure and a source of auxiliary reservoir pressure to provide a brake cylinder reference pressure based on the difference between the brake pipe pressure and the auxiliary reservoir pressure
Implementation Method 2
The brake cylinder reference pressure is fed to a choke having a reference area for restricting the flow of the brake cylinder reference pressure and then to a volume in communication with the choke for storing the restricted brake cylinder reference pressure
Implementation Method 3
the resulting force imbalance will cause movement that opens communication between the brake pipe and the brake cylinder, thus replenishing any lost brake cylinder pressure
Data Source
AI summary
A brake cylinder maintaining system produces a brake cylinder reference pressure based on the difference between the brake pipe pressure and the auxiliary reservoir pressure and then feeds that pressure to a choke and a volume so that the ratio of the reference area of the choke to the volume of stored brake cylinder reference pressure is substantively equal to the ratio of a brake cylinder charging valve area to the brake cylinder volume. The resulting reference pressure may be used to adjust brake cylinder pressure by providing the reference pressure to a standard quick service limiting valve or to a relay that can selectively charge or exhaust the brake cylinder.