Aircraft Cabin Temperature Control Using Distributed Sensor Averaging

Solution Overview

Problem

Existing cabin temperature regulation systems in passenger aircraft often fail to maintain a consistent and pleasant ambient temperature across all zones, leading to discomfort for passengers due to localized temperature fluctuations and inadequate representation of average cabin temperature by single sensors.

Innovation Solution

A method utilizing multiple temperature sensors distributed throughout the cabin to gather individual temperature values, which are then processed to derive a representative ambient temperature measurement, compared to a reference value, and used to regulate the feed air temperature, thereby reducing the impact of localized fluctuations and ensuring a consistent cabin temperature.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single temperature sensor is used in each cabin zone, then the device complexity is reduced, but the measurement precision and reliability of ambient temperature are insufficient due to localized fluctuations

Engineering Contradiction:

Improvetemperature sensor systemVSAvoidambient temperature measurement

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The cabin zone is divided into multiple measurement points with individual temperature sensors distributed throughout the zone. Each sensor measures temperature at its specific location, and the control unit calculates the average of all sensor readings to determine the overall ambient temperature. This segmentation approach captures localized temperature variations while providing an accurate representative value for the entire zone.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple temperature sensor signals from different locations within the cabin zone are merged by the control unit through averaging calculation. This combines the individual measurements into a single representative ambient temperature value that reflects the overall thermal conditions of the entire zone, improving measurement precision without requiring a single complex sensor.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If multiple temperature sensors are distributed throughout the cabin zone, then the measurement precision and reliability of ambient temperature are improved, but the device complexity increases

Engineering Contradiction:

Improveambient temperature measurementVSAvoidtemperature sensor system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The cabin zone is divided into multiple measurement points with individual temperature sensors distributed throughout the zone. Each sensor measures temperature at its specific location, and the control unit calculates the average of all sensor readings to determine the overall ambient temperature. This segmentation approach captures localized temperature variations while providing an accurate representative value for the entire zone.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The control unit performs multiple functions: it receives signals from multiple temperature sensors, calculates the average ambient temperature, determines the regulatory difference from the target value, and controls the feed air temperature. This multi-functional approach consolidates the complexity into a single control unit rather than requiring separate systems for each function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If a single temperature sensor is used, then the control system is simpler, but the ambient temperature cannot be reliably regulated to target value across all cabin zones due to localized temperature differences

Engineering Contradiction:

Improvetemperature regulation controlVSAvoidambient temperature regulation

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The cabin zone is divided into multiple measurement points with individual temperature sensors distributed throughout the zone. Each sensor measures temperature at its specific location, and the control unit calculates the average of all sensor readings to determine the overall ambient temperature. This segmentation approach captures localized temperature variations while providing an accurate representative value for the entire zone.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The control unit continuously monitors temperature readings from multiple sensors, calculates the average ambient temperature, determines the regulatory difference from the target value, and adjusts the feed air temperature accordingly. This closed-loop feedback system ensures reliable temperature regulation by constantly comparing actual conditions with desired targets and making real-time adjustments.

Inventive Principle:

Principle #23Feedback

4Measurement precision

If multiple temperature sensors are used to capture localized variations, then the reliability of temperature representation is improved, but the device complexity and cost increase

Engineering Contradiction:

Improvecabin temperature representationVSAvoidtemperature sensor system

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The cabin zone is divided into multiple measurement points with individual temperature sensors distributed throughout the zone. Each sensor measures temperature at its specific location, and the control unit calculates the average of all sensor readings to determine the overall ambient temperature. This segmentation approach captures localized temperature variations while providing an accurate representative value for the entire zone.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using a single complex high-precision sensor, the system uses multiple simpler temperature sensors and changes the measurement approach by averaging multiple readings. This parameter change in the measurement strategy achieves better overall precision while keeping individual sensor complexity low.

Inventive Principle:

Principle #35Parameter changes

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

This approach provides a reliable and consistent ambient temperature across the cabin, enhancing passenger comfort by better representing the overall cabin temperature and reducing the influence of localized temperature interference.

Implementation Method 1

a temperature sensor system (24) takes a measurement value for ambient temperature in the cabin area

Methodology Applied

Scientific EffectThermal energy measurement:

Implementation Method 2

the temperature of the feed air is controlled dependent upon a deviation of the ambient temperature measurement value in relation to an ambient temperature optimum value

Methodology Applied

Scientific EffectThermal energy transfer:

Data Source

PatentUS8336609B2Method for controlling the feed air temperature of a passenger aircraft

Publication Date: 2012.12.25 AIRBUS OPERATIONS GMBH

AI summary

A passenger aircraft includes a cabin subdivided into a plurality of cabin zones supplied with feed air from respective supply lines, a plurality of temperature sensors, and an electronic control unit coupled to the plurality of temperature sensors. The plurality of temperature sensors measures a plurality of individual ambient temperature values associated with different locations in at least one of the plurality of cabin zones. The electronic control unit derives a derived ambient temperature value for the at least one cabin zone from the plurality of individual ambient temperature values. The electronic control unit then controls a temperature of the feed air supplied to the at least one cabin zone based on the difference between the derived ambient temperature value and a room temperature target value for the at least one cabin zone.