Aircraft Breathing Gas Control for Precise Oxygen Dilution
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Solution Overview
Problem
Existing systems for regulating oxygen delivery in aircraft breathing systems lack precision, leading to potential oxygen under-consumption or over-consumption, which can result in safety issues and reduced autonomy, particularly affecting pilots.
Innovation Solution
A breathing system with a control system that includes sensors to measure the delivered gas mixture, a gas mixture intake valve, and a diluent gas inlet valve, allowing for precise regulation of oxygen proportion through feedback loops and phase-based dilution to match the occupant's breathing pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If mechanical dilution control using venturi tube and altimetric capsule is used, then device complexity is reduced, but measurement precision and control accuracy of oxygen proportion are insufficient
Solution Approach 1:
The patent replaces the purely mechanical dilution control system (venturi tube with altimetric capsule) with an electronically controlled system. A control unit receives signals from sensors and adjusts the dilution ratio electronically, substituting mechanical altitude-based control with electronic feedback control that can achieve higher precision in oxygen proportion regulation.
Solution Approach 2:
The patent introduces feedback control mechanisms where sensors monitor the actual oxygen proportion in the gas mixture and feed this information back to a control unit. The control unit then adjusts the dilution ratio to maintain the desired oxygen concentration, creating a closed-loop control system that significantly improves measurement precision and control accuracy compared to open-loop mechanical systems.
2Duration of action of moving object
If continuous dilution is applied, then oxygen delivery is maintained continuously, but oxygen reserves are depleted faster due to potential over-consumption
Solution Approach 1:
The patent implements dynamic adjustment of the dilution ratio based on real-time monitoring of breathing patterns, altitude, and oxygen consumption rates. Rather than maintaining a fixed continuous dilution rate, the system dynamically optimizes the oxygen delivery rate to match actual physiological needs and environmental conditions, thereby extending oxygen reserve duration while maintaining adequate supply.
Solution Approach 2:
The patent changes the dilution ratio parameter dynamically based on multiple inputs including altitude, breathing rate, and detected oxygen levels. By adjusting this key parameter in response to changing conditions, the system optimizes the balance between continuous oxygen delivery and conservation of oxygen reserves, preventing both under-supply and unnecessary depletion.
3Adaptability or versatility
If separate injection of oxygen and diluent air is used, then control flexibility is improved, but device complexity increases due to multiple valves and control mechanisms
Solution Approach 1:
The patent combines multiple control functions into a single integrated control unit that manages both oxygen flow and diluent air flow. Rather than using separate mechanical control mechanisms for each gas stream, the system merges control authority into one electronic control unit that coordinates both flows, reducing overall device complexity while maintaining the flexibility of separate injection capability.
Solution Approach 2:
The control unit is designed as a multi-functional device that performs multiple tasks: monitoring sensor inputs, calculating required oxygen proportions, controlling both oxygen and diluent air valves, and adapting to different operating conditions. This universal control component replaces what would otherwise require multiple specialized mechanical control mechanisms, achieving control flexibility without proportional increases in device complexity.
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
Ensures accurate oxygen delivery, minimizing safety risks and maintaining oxygen reserves by adapting to breathing conditions and patterns, enhancing pilot vigilance and flight safety.
Implementation Method 1
The capsule volume may be in communication with the outside, so that acceleration of the oxygen in the venturi tube creates negative pressure which sucks in the diluent gas, such as ambient air, with which it is mixed.
Implementation Method 2
The onboard oxygen generation system may also comprise a molecular sieve oxygen generating system (also referred to by the acronym MSOGS) arranged to provide oxygen-enriched air at a desired oxygen concentration by adsorbing nitrogen from the air supplied to the system.
Data Source
AI summary
A breathing system, in particular for an aircraft, includes a distribution member to deliver a gas mixture to at least one occupant, a gas mixture inlet connected to a source of breathable gas and having an intake valve for regulating a proportion of breathable gas in the gas mixture, a diluent gas inlet, connected to a source of diluent gas and having a diluent gas inlet valve for regulating a proportion of diluent gas in the gas mixture, at least one sensor for measuring a proportion of breathable gas in the gas mixture delivered by the distribution member, and a control system for regulating the delivered proportion of breathable gas as a function of the measured information and to control the gas mixture intake valve and the diluent gas inlet valve as a function of the delivered proportion of breathable gas and a desired proportion of breathable gas.