Method to use ultrafine particulate matter detection and measurement to control air supply system contaminant delivery to the aircraft cabin environment
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Solution Overview
Problem
Current aircraft environmental control systems (ECS) are inadequate in real-time monitoring and controlling ultrafine particles and oil-based contaminants, which can compromise flight safety by causing pilot and cabin crew discomfort and fatigue, and existing sampling methods are insufficient to fully characterize cabin air quality.
Innovation Solution
An adaptive ECS with a controller that continuously monitors particulate concentrations using sensors and adjusts air purification subsystems, such as fan speed and air flow, based on predicted sensory response thresholds to maintain acceptable air quality by comparing particulate signals against odor and irritancy detection thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional air sampling methods are used to verify cabin air quality, then air quality can be assessed, but real-time monitoring and full characterization of ultrafine particles and oil-based contaminants cannot be achieved
Solution Approach 1:
The patent replaces traditional mechanical sampling methods with optical detection systems (light scattering sensors) to detect ultrafine particles. This substitution enables real-time measurement of particulate matter concentrations without the time delays inherent in collecting and analyzing physical air samples, thereby achieving both real-time monitoring and comprehensive characterization of contaminants.
Solution Approach 2:
The patent changes the measurement parameters from traditional bulk air quality metrics to specific ultrafine particle concentration thresholds (e.g., 500,000 particles per cubic centimeter). By establishing real-time particle count thresholds and comparing sensor readings against these thresholds, the system achieves continuous monitoring capability that traditional sampling methods cannot provide.
2Difficulty of detecting and measuring
If pilots rely on their noses to identify bleed air contaminants, then contaminant detection is possible, but exposure time is prolonged and flight safety is compromised
Solution Approach 1:
The patent implements a feedback system where sensors continuously monitor cabin air quality and provide real-time data to the environmental control system. When ultrafine particle concentrations exceed predetermined thresholds, the system automatically triggers corrective actions (increasing fresh air flow, activating purification systems), eliminating the need for pilots to manually detect contaminants and respond, thereby reducing exposure time and improving flight safety reliability.
Solution Approach 2:
The environmental control system performs self-monitoring and self-correction regarding air quality. The sensors and control mechanisms work autonomously to detect contaminants and adjust ventilation without requiring pilot intervention, allowing the system to serve itself in maintaining safe cabin air quality while pilots focus on flight operations.
3Measurement precision
If multiple EPA sampling methods are used to characterize cabin air contaminants, then comprehensive analysis is achieved, but system complexity and operational difficulty increase
Solution Approach 1:
The patent employs a universal sensor system that can detect multiple types of contaminants (ultrafine particles, oil-based contaminants, and other particulate matter) using a single detection platform based on light scattering principles. This multi-functional approach replaces the need for multiple specialized sampling methods, reducing system complexity while maintaining comprehensive contaminant characterization capability.
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 maintains safe and comfortable cabin air by continuously controlling particulate levels, reducing exposure to contaminants and enhancing flight safety by providing real-time data and adaptive corrective actions.
Implementation Method 1
a sensor that senses particulates in the contaminated air
Data Source
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Figure 2
AI summary
An environmental control system (ECS) having particulates in air therein includes a sensor, an air purification subsystem, and a controller in communication with the sensor and air purification subsystem. The sensor detects particulates in the air, and generates a particulate concentration signal. The controller: compares the particulate concentration signal to a predicted particulate concentration threshold that is based on one of a probability of odor detection, a probability of sensory irritancy detection, and a combination thereof. When the particulate concentration signal reaches the predicted particulate concentration threshold, the controller commands the air purification subsystem to alter a condition in the air containing the particulates.