Dynamic Fire Alarm Sensitivity Control for Nuisance Reduction
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Solution Overview
Problem
Fire alarm systems in large buildings face challenges due to static detector sensitivity configurations, leading to either nuisance alarms or inadequate detection, as rooms with varying uses can trigger false alarms or fail to detect fires effectively.
Innovation Solution
A fire alarm control system that dynamically adjusts detector sensitivity based on scheduled events and intended room use, allowing for user-configurable sensitivity settings through a control panel and integration with scheduling applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If detector sensitivity is configured with a default static setting, then the system is simple to operate and maintain, but the detection accuracy is compromised for certain room uses
Solution Approach 1:
The patent implements dynamic sensitivity adjustment by allowing the detector's alarm threshold to be modified based on scheduled events and room usage. The sensitivity parameter changes from a fixed default value to a time-varying parameter that adapts to different occupancy scenarios, resolving the contradiction between operational simplicity and detection accuracy.
Solution Approach 2:
The system changes the detector sensitivity parameter dynamically based on event schedules and room usage patterns. By modifying the alarm threshold parameter according to pre-configured event types and occupancy expectations, the system achieves both ease of operation through automated adjustment and improved detection accuracy for specific uses.
2Reliability
If detector sensitivity is increased for better detection, then fire detection capability is improved, but nuisance alarms increase in certain uses
Solution Approach 1:
The system applies preliminary anti-action by pre-configuring event schedules that anticipate situations where increased sensitivity would cause nuisance alarms. Before such events occur, the system automatically adjusts sensitivity parameters to appropriate levels, preventing false alarms while maintaining high detection capability when needed.
Solution Approach 2:
The system performs preliminary action by establishing event schedules and sensitivity configurations in advance. Based on the type of event (e.g., conference, gymnasium, kitchen), the appropriate sensitivity level is pre-determined and automatically applied, ensuring optimal detection capability while preventing nuisance alarms before they occur.
3Object-generated harmful factors
If detector sensitivity is decreased to avoid nuisance alarms, then false alarms are reduced, but detection capability is compromised
Solution Approach 1:
The system dynamically adjusts sensitivity based on the current event and expected occupancy. Rather than using a permanently reduced sensitivity setting, the system temporarily lowers the alarm threshold during events prone to generating false alarms (such as aerosol use in conference rooms) and restores higher sensitivity when such conditions are not present, maintaining both false alarm reduction and detection capability.
Data Source
AI summary
A fire alarm control system includes a plurality of detectors, a control panel, and a control station. Each detector includes a sensor and is configured to generate an alarm signal based on the sensor and an alarm sensitivity. The control panel is configured to receive alarm signals from the plurality of detectors to control alarm devices. The control station is configured to receive an indication of an intended use of a room for a period of time; generate a user interface to receive a configuration of alarm sensitivity for one or more of the plurality of detectors associated with the room; and update the alarm sensitivity for the one or more of the plurality of detectors associated with the room.