Fire Alert Signal Timing for Detector Fault Differentiation
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Solution Overview
Problem
Existing fire alert systems in aircraft lack reliable methods to differentiate between the extinction of a fire and detector malfunction, leading to ambiguous information for the crew, especially when one detector fails during a fire.
Innovation Solution
A method and system that determine a transitory time between the end of a fire alert signal and the start of a fault signal, comparing it to an alert threshold time, to differentiate between fire extinction and detector malfunction, and trigger an alert signal if the transitory time is less than the threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fire detector continues to monitor after fire extinction, then the system can detect re-ignition, but the detector may malfunction due to prolonged exposure to heat and smoke
Solution Approach 1:
The system performs preliminary actions by monitoring the fire alert signal duration and comparing it against predetermined thresholds before the detector may malfunction. The processing system proactively identifies when a fire has been detected for a sufficient duration to be considered real, triggering the alert while the detector is still functional but before potential heat-induced malfunction occurs.
2Measurement precision
If the fire alert signal duration is extended to ensure accurate fire detection, then false alarms are reduced, but the crew receives ambiguous information when the detector fails during prolonged fire
Solution Approach 1:
The system implements feedback by continuously monitoring the fire alert signal and comparing its duration against predetermined thresholds. When the signal duration exceeds the threshold, the system provides feedback to the crew through the alarm system, indicating with certainty that a fire has been detected. This feedback mechanism eliminates ambiguity by using time-based confirmation rather than uncertain real-time detection.
3Strength
If the fire detector is designed to function for a minimal time (e.g., 5 minutes), then the detector can survive the fire, but the crew cannot determine if the fire is persisting or has extinguished
Solution Approach 1:
The system performs preliminary monitoring of the fire alert signal duration before the detector's minimal functioning time expires. By comparing the signal duration against predetermined thresholds during the detector's operational window, the system determines in advance whether the fire has extinguished or is persisting, providing the crew with this information before the detector may fail due to prolonged fire exposure.
Data Source
AI summary
A method of managing fire alert signals coming from at least one fire detector configured to generate at least one fire alert signal if overheating is detected, a fault signal being generated if the fire detector is malfunctioning. The management method includes a step of determining a transitory time between the end of the fire alert signal and the start of the fault signal, and a step of emitting an alert signal if the transitory time is less than or equal to an alert threshold time. This solution enables reliable determination if the end of the fire alert signal is the result of extinction of the fire or malfunctioning of the fire detector. A system for executing the method is also provided.