Parking Brake State Indication Using Pressure Chamber Signals
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Solution Overview
Problem
Existing rail vehicle braking systems lack a reliable and economical means to indicate the state of the parking brake, which is crucial for ensuring safe operation.
Innovation Solution
A braking system with an indicator device that combines information from the parking brake and service brake pressure chambers to accurately detect and indicate the engaged or disengaged state of the parking brake, using contactor devices and visual indicators for clear status display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no indicator device is provided for the parking brake state, then the device complexity is reduced, but the reliability of indicating the parking brake state deteriorates
Solution Approach 1:
The patent combines the parking brake state indication with the existing service brake pressure indication system. The indicator device uses the same visual display elements (lights or displays) already present in the service brake system, merging two indication functions into one unified device. This reduces overall system complexity while improving the reliability of parking brake state indication by integrating it with an established reliable system.
Solution Approach 2:
The indicator device is designed to serve multiple functions: it indicates both the service brake pressure state and the parking brake state through a unified display system. The same visual indicators are used to convey different brake states, making the device universal and multi-functional rather than requiring separate dedicated indicators for each brake system.
2Ease of manufacture
If a simple indicator device is used, then the ease of manufacture is improved, but the measurement precision of the parking brake state deteriorates
Solution Approach 1:
The patent introduces an intermediary mechanism (the state pipe connecting the pressure chamber to the indicator device) that translates the complex parking brake state into a simple visual signal. This intermediary allows the use of a simple, easy-to-manufacture indicator device while maintaining precise detection capability, as the intermediary handles the complex state detection and presents it in a simplified form to the display elements.
Solution Approach 2:
The patent replaces complex mechanical state detection mechanisms with a pneumatic/hydraulic signaling system. Instead of using mechanical sensors or switches to detect the parking brake state, the system uses pressure changes in the fluid medium to convey state information to the indicator device. This substitution maintains high detection precision while enabling the use of simpler, more easily manufactured indicator components.
Data Source
AI summary
A braking system for a vehicle includes an indicator device provided to reliably indicate a state of a parking brake of the system, while being simple, convenient, and economical. The system includes a body that delimits a service brake pressure chamber and/or a parking brake pressure chamber, a parking brake movable relative to the body, an unlocking part for unlocking the parking brake connected to the parking brake pressure chamber and accessible from outside the body, and a parking brake indicator device. The indicator device is configured to receive a position of the unlocking part via a state pipe and an indicator of supply and/or the venting of the service brake pressure chamber and/or of the parking brake pressure chamber. This information is processed in to detect and indicate an engaged state or a disengaged state of the parking brake.