Brake Control System with Redundant Valve Segmentation
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Solution Overview
Problem
Current vehicle braking systems, particularly in locomotives, are vulnerable to failures of electronically controlled valves, leading to disruptions in normal operation and inability to continue operating the train under default brake application and release functions, with existing failsafe systems not allowing continued operation.
Innovation Solution
A braking control system with a control chamber, electronically-controlled charge and vent valves, and an operating state control that switches between normal and backup modes, enabling independent brake controller operation and backup equalizing reservoir control to maintain braking functionality even in valve failure scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If electronically controlled valves are used for brake pipe pressure control, then braking system automation and control precision are improved, but system reliability deteriorates due to vulnerability to electronic valve failures
Solution Approach 1:
The brake control system is segmented into multiple independent control valves (first electronically-controlled charge valve, first electronically-controlled vent valve, second electronically-controlled charge valve, second electronically-controlled vent valve) that can operate independently. This segmentation allows the system to continue functioning even if some valves fail, resolving the contradiction between automation and reliability.
Solution Approach 2:
The patent implements backup control valves that are prepared in advance to take over if primary valves fail. The controller is configured to detect valve failures and automatically switch to backup valves, providing beforehand cushioning against electronic valve failures while maintaining automated brake control.
2Reliability
If backup control valves are added to the system, then system reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the primary and backup control valves into a unified brake control system with a single controller that manages all valves. The controller integrates failure detection and automatic switching functionality, combining multiple functions into one control unit. This merging approach improves reliability through redundancy while managing complexity through centralized control logic.
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
Enables continued operation of the train by switching to a backup mode that activates independent brake control, ensuring air pressure management and brake functionality even if primary valve systems fail, thus preventing complete shutdown due to electronic valve failures.
Implementation Method 1
a first electronically-controlled charge valve (1C valve) including an input configured to be connected to the source of control pressure and an output connected to the control chamber. The first charge valve is configured to, in a first state, permit air flow into the control chamber, and, in a second state, prevent air flow into the control chamber
Implementation Method 2
a first electronically-controlled vent valve (1V valve) including an input connected to the control chamber and an exhaust port connected to atmosphere. The first vent valve is configured to, in a first state, prevent air flow out of the control chamber, and, in a second state, permit air flow out of the control chamber and vent air to atmosphere
Implementation Method 3
a source of control pressure, and at least one brake. The system includes a pneumatic operating unit including a brake pipe control portion. The brake pipe control portion includes a primary passage network configured to interconnect the brake pipe to at least one pneumatic charging valve and at least one pneumatic venting valve. The brake pipe control portion also includes a control passage network configured to interconnect the source of control pressure to at least one electronically controlled valve; the source of control pressure is configured to cause operation of the at least one pneumatic charging valve and the at least one pneumatic venting valve
Data Source
AI summary
A braking control system for a vehicle system includes a control chamber configured to control air pressure of a brake pipe of the vehicle system. The system also includes first and second charge valves and first and second vent valves. The first charge valve and the first vent valve are controllable to vent or charge the brake pipe, and the second charge valve and the second vent valve are separately controllable for the same purpose. The system also includes a controller configured to switch operation of the vehicle system between a first operation mode, where the first charge valve and the first vent valve are enabled, and a second operation mode, where the second charge valve and the second vent valve are enabled, in response to an input.