Adaptive Aircraft Oxygen Supply System for Breathing Frequency Control
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Solution Overview
Problem
Aircraft emergency oxygen supply systems often run out of oxygen prematurely or fail to provide sufficient oxygen to passengers during cabin pressure loss, particularly in scenarios where breathing rates deviate from typical human norms.
Innovation Solution
An adaptive oxygen supply system that includes a breath sensor and controller to adjust oxygen delivery based on breathing frequency, switching between normal, slow, and fast breathing modes to optimize oxygen usage, ensuring sufficient oxygen supply while prolonging the oxygen source's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a predefined amount of oxygen is supplied to each passenger oxygen mask based on typical human breathing needs, then the oxygen supply system is simple to operate, but the system may run out of oxygen early or supply not enough oxygen to passengers in certain operating scenarios
Solution Approach 1:
The system transitions from static predefined oxygen supply to dynamic adaptive supply by continuously monitoring breathing frequency and adjusting oxygen flow rate in real-time. The controller modifies the oxygen supply rate based on detected breathing patterns, enabling the system to adapt to individual passenger needs and maintain reliable oxygen supply throughout the emergency duration.
Solution Approach 2:
The system implements feedback control by using breath sensors to detect passenger breathing frequency and feeding this information back to the controller. The controller then adjusts the oxygen supply rate accordingly, creating a closed-loop system that automatically optimizes oxygen delivery based on actual passenger physiological state, preventing both oxygen depletion and insufficient supply.
2Device complexity
If a fixed oxygen supply rate is used for all passengers, then the device complexity is low, but the system cannot adapt to different breathing rates causing premature oxygen depletion or insufficient oxygen supply
Solution Approach 1:
The system achieves self-service adaptability through automated breathing frequency detection and autonomous oxygen supply adjustment. The breath sensors continuously monitor passenger breathing patterns, and the controller automatically modifies oxygen flow without requiring manual intervention or complex user input, enabling the system to self-regulate based on individual needs while maintaining manageable complexity.
Solution Approach 2:
The system dynamically changes the oxygen supply rate parameter based on detected breathing frequency. The controller adjusts the oxygen flow rate parameter in response to variations in breathing patterns, allowing the system to adapt to different passenger requirements. This parameter adaptation approach enables versatility across different breathing rates while keeping the overall system structure relatively simple.
3Reliability
If oxygen is supplied at a high rate to ensure sufficient oxygen supply, then passenger oxygen safety is improved, but the oxygen source depletes faster reducing the duration of action
Solution Approach 1:
The system applies partial action by supplying oxygen at rates optimized for individual breathing needs rather than using uniformly high rates for all passengers. The controller adjusts oxygen supply to match actual consumption patterns, providing sufficient oxygen for safety while avoiding excessive supply that would deplete the oxygen source prematurely. This targeted approach extends the duration of action.
Solution Approach 2:
The system maintains continuous adaptation of oxygen supply to breathing patterns throughout the emergency duration. By continuously monitoring and adjusting oxygen delivery to match actual passenger needs, the system ensures sustained oxygen safety without waste. This continuous optimization extends the operational duration of the oxygen source while maintaining reliable supply.
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
The system effectively manages oxygen distribution by reducing oxygen flow during fast breathing and increasing it during slow breathing, preventing early depletion and ensuring passengers receive adequate oxygen, even in high-altitude emergencies.
Implementation Method 1
The breath sensor may be configured for detecting a negative pressure, which is generated within the passenger oxygen mask each time the passenger wearing the passenger oxygen mask inhales
Implementation Method 2
The oxygen source may be a chemical oxygen generator, which, after being activated, starts a chemical reaction generating oxygen gas
Implementation Method 3
The oxygen source may be an oxygen storage device, such as a gas bottle, filled with compressed oxygen gas
Data Source
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AI summary
An aircraft emergency oxygen supply system (2) comprises a passenger oxygen mask (12) for supplying oxygen to a passenger wearing the passenger oxygen mask (12); an oxygen source (20) for supplying oxygen to the passenger oxygen mask (12); a breath sensor (36) for detecting breaths (30) of the passenger wearing the passenger oxygen mask (12); and a controller (18) for controlling the supply of oxygen from the oxygen source (20) to the passenger oxygen mask. The controller (18) is configured for operating in a normal breathing mode, which includes supplying a normal breathing amount of oxygen (VN) from the oxygen source (20) to the passenger oxygen mask (12) at every breath (30) of the passenger wearing the passenger oxygen mask (12); deriving a breathing frequency indicator from a plurality of successive breaths (30) of the passenger; and switching into a fast or into a low breathing mode if the breathing frequency indicator indicates a breathing frequency above or below predefined frequency thresholds. Operating in the fast or slow breathing mode includes supplying a fast or slow breathing amount of oxygen (VF, VS), which differs from the normal breathing amount of oxygen (VN), from the oxygen source (20) to the passenger oxygen mask (12) at every breath (30) of the passenger.