Aircraft Cabin Feed Air Temperature Control Without Reliable Zone Sensors
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Solution Overview
Problem
In passenger aircraft cabins, localized and periodic temperature fluctuations can lead to inaccurate temperature readings by sensors, resulting in uncomfortable cabin conditions due to either too hot or too cold air injection, especially when sensors are installed in areas with temperature peaks or where space constraints prevent proper sensor placement.
Innovation Solution
The method involves establishing the injection temperature optimum value for a cabin zone by referencing the injection temperature values of adjacent zones or using external temperature measurements, with correction values accounting for zone-specific factors, to ensure stable and comfortable cabin conditions even without representative ambient temperature readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are installed in cabin zones to measure ambient temperature, then temperature regulation can be achieved, but sensor placement may be affected by localized temperature peaks or fluctuations leading to inaccurate readings
Solution Approach 1:
The patent combines temperature measurements from multiple cabin zones to determine the injection temperature optimum value. By merging data from adjacent zones, the system compensates for localized temperature fluctuations in any single zone, achieving more reliable temperature regulation despite harmful local thermal effects.
Solution Approach 2:
The control unit acts as an intermediary that processes temperature data from multiple zones and calculates the optimal injection temperature. This intermediary computation layer transforms raw sensor readings (which may be affected by local fluctuations) into a reliable control parameter that accounts for overall cabin thermal conditions.
2Adaptability or versatility
If discrete temperature sensors are used for each cabin zone, then individual zone temperature control is possible, but sensor placement becomes problematic in zones with temperature peaks or limited space
Solution Approach 1:
The patent makes temperature data from adjacent cabin zones serve multiple purposes. Temperature measurements from neighboring zones are not only used for their respective zone control but also contribute to determining the optimum injection temperature for zones where direct measurement is problematic, creating a universal data utilization approach.
Solution Approach 2:
The patent segments the cabin into multiple zones with individual temperature control capabilities. By dividing the cabin environment into distinct controllable segments, the system can independently regulate temperature in each zone while using data from adjacent segments to compensate for measurement issues in any single zone.
3Reliability
If temperature sensors are placed in all cabin zones, then complete temperature monitoring is achieved, but installation cost and complexity increase significantly
Solution Approach 1:
The patent uses temperature data from adjacent zones as a substitute or copy for direct measurement in zones where sensors are not installed or where readings are unreliable. This data copying approach allows the system to maintain reliable temperature control without requiring physical sensors in every single zone, reducing overall system complexity.
Data Source
AI summary
With a method for controlling the temperature of feed air which is injected into the cabin zone of a passenger aircraft, the cabin of which is sub-divided into several cabin zones supplied respectively with specially temperature-controlled feed air, the temperature of the injected feed air is controlled for each cabin zone, dependent upon the deviation of an injection temperature actual value for the feed air injected into the cabin zone in question, measured by sensors, in relation to an injection temperature optimum value. If there is no, or at least no usable reading of the ambient temperature of this cabin zone for a cabin zone, an optimum value for the injection temperature of this cabin zone can be established in accordance with a variation, whereby it is determined upon the basis of the injection temperature optimum values and/or the injection temperature actual values of other cabin zones, whereby the measurement by sensors of the cabin temperature works reliably. In accordance with another variation, the injection temperature optimum value of a cabin zone can be established without measuring ambient temperature by sensors or without reliably measuring ambient temperature from the temperature measured for the external surrounds of the aircraft.