Aircraft Fire Extinguishing System State-Controlled Activation
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Solution Overview
Problem
Current fire extinguishing systems in airplanes, particularly in cargo holds, face issues with the use of halon-based agents, which are environmentally harmful, and the risk of unintended activation leading to unnecessary extinguishing agent release, especially when the airplane is on the ground and cargo hold doors are open, compromising safety and effectiveness.
Innovation Solution
A fire extinguishing system with a control unit that activates the closing device only based on specific airplane states, preventing unintended activation and allowing the use of alternative, less harmful extinguishing agents by integrating sensor systems to determine the airplane's state and control the release of the extinguishing agent, ensuring safety and effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halon-based extinguishing agents are used, then fire extinguishing effectiveness is improved, but environmental harm increases
Solution Approach 1:
The patent changes the chemical composition parameter of the extinguishing agent from halon-based to alternative agents (such as nitrogen, carbon dioxide, or halon-free compounds), thereby reducing environmental harm while maintaining fire suppression capability through adjusted agent properties and concentration levels
2Speed
If the closing device is activated manually without state verification, then response speed is improved, but unintended activation risk increases
Solution Approach 1:
The patent introduces sensor systems that continuously monitor airplane state (flight mode, cargo hold door position, pressure differential) and provide feedback to the control unit. The closing device is only activated when the control unit verifies appropriate conditions, preventing unintended activation while maintaining rapid response capability through pre-positioned components and quick-actuation mechanisms
3Reliability
If the fire extinguishing system is always ready to activate, then fire protection capability is improved, but false activation risk increases
Solution Approach 1:
The patent performs preliminary verification of airplane state (flight mode, door position, pressure differential) through sensor systems before allowing activation. The control unit pre-conditions the system by checking multiple parameters and only permitting closing device actuation when appropriate conditions are met, thereby preventing false activation while maintaining fire protection readiness
4Measurement precision
If sensor systems and control units are integrated, then activation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple sensor types (door position sensors, pressure sensors, flight mode detectors) into a single control unit that performs multiple functions: monitoring various airplane states, evaluating activation conditions, and controlling the closing device. This multi-functional integration improves activation accuracy while minimizing the increase in overall system complexity through consolidated architecture
Data Source
AI summary
An airplane fire extinguishing system comprises an extinguishing agent storage unit with an activatable closing device, which makes possible, when active, an outflow of extinguishing agent from the extinguishing agent storage unit, and a supply line, connected with the closing device and an outlet opening, via which the extinguishing agent can be conducted from the extinguishing agent storage unit to the outlet opening, in order to eject it there for firefighting, wherein one or more sensor systems are present, by means of which a current airplane state can be determined, and a control unit, connected with the closing device and an actuatable input element, is present, via which the closing device can be activated, the control unit constructed and configured in such a way that the closing device is activated, as a function of the current airplane state, which exists at the time of an actuation of the input element.