Aircraft Exit Door Indication System Using Dynamic Light Sequencing
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Solution Overview
Problem
Current emergency exit guidance systems in aircraft are inadequate as they may not be highly visible in low-light or smoky conditions, leading to confusion and misinterpretation of exit locations during emergencies.
Innovation Solution
An aircraft emergency exit door indication system using a controller and sensors to operate light sources along aisles, which are sequentially pulsed to direct passengers to available exits, with color changes indicating exit availability and unavailability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If static signs and phosphorescent floor marking are used for exit identification, then the system structure is simple, but the visibility and effectiveness are reduced in darkness or smoky conditions
Solution Approach 1:
The patent transforms static exit signs into dynamic lighting systems that can change intensity, color, and pattern. The lighting system responds to sensor inputs (smoke detection, motion detection) and actively adjusts its behavior to guide passengers to available exits, resolving the contradiction between visibility and complexity by using adaptive control algorithms.
Solution Approach 2:
The system changes multiple parameters simultaneously: illumination intensity (brightness levels), color (to indicate exit availability or hazards), and temporal patterns (flashing sequences). These parameter changes enable the system to communicate complex information about multiple exits and their status without requiring proportionally complex hardware.
2Loss of information
If multiple light sources are used to indicate different exit directions, then the guidance information becomes more comprehensive, but the system complexity and cost increase
Solution Approach 1:
Each light source in the system is designed to perform multiple functions: indicating exit location, showing exit availability status, providing directional guidance through sequential activation, and alerting passengers to hazards. This multi-functionality reduces the need for separate specialized components for each function, thereby reducing overall system complexity while maintaining comprehensive information delivery.
Solution Approach 2:
The system uses color changes in the light sources to encode different types of information about exit availability and conditions. Different colors represent different states (e.g., green for available, red for blocked), allowing the system to communicate complex status information using the same physical light sources without requiring additional indicators.
3Ease of operation
If light sources are sequentially pulsed to create travelling light paths, then the directional guidance becomes more clear and unambiguous, but the control system complexity increases
Solution Approach 1:
The system uses periodic pulsing of light sources in sequential patterns to create travelling light paths that clearly indicate direction. The periodic nature of this action (repeating sequences) simplifies the control logic compared to continuous variable control, as it relies on timing and sequencing rather than analog control, thereby reducing control system complexity while maintaining guidance clarity.
4Measurement precision
If real-time sensor feedback is implemented to indicate exit availability, then the guidance accuracy improves, but the system complexity and power consumption increase
Solution Approach 1:
The system implements sensor feedback loops that detect exit conditions (availability, hazards) and automatically adjust the lighting guidance accordingly. The feedback is processed using threshold-based logic and simple state machines rather than complex continuous control, enabling real-time adaptation while maintaining reasonable power consumption through event-triggered updates rather than continuous operation.
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 guides passengers to the nearest safe exit by providing clear and unambiguous visual cues, reducing confusion and ensuring rapid evacuation in emergency situations.
Implementation Method 1
a first plurality of light sources, a controller in electronic communication with the first plurality of light sources
Data Source
AI summary
An aircraft emergency exit door indication system may comprise a first plurality of light sources, a controller, and a first sensor associated with a first exit door. The first sensor feedback signal indicates an availability for egress through the first exit door. The first plurality of light sources is operated by the controller based upon the first sensor feedback signal. The light sources may be lights that already exist in an aircraft such as ceiling wash lights, sidewall wash lights, floor path lights, dome lights, or passenger service unit lights. The system may include a second plurality of light sources logically separated from the first plurality of light sources based upon its location relative to the first exit door and a second exit door.