Supervised Interconnect Smoke Alarm Loop Topology
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Solution Overview
Problem
Existing fire and smoke detection systems fail to maintain effective communication between detectors if the control or interconnect bus becomes disconnected, leading to disabled communication with the electrical panel and potential undetected hazards.
Innovation Solution
A supervised interconnect smoke alarm system with a loop configuration using an interconnect line for supervision between detectors, allowing each to detect operational status without a central control panel, and utilizing a processor to determine signal receipt within a predetermined time for fault detection, with options for both wired and radio frequency connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a central control panel is used to manage detector communication, then system control and monitoring are centralized, but the system becomes vulnerable to single points of failure and communication disruptions
Solution Approach 1:
The patent divides the centralized control function into distributed peer-to-peer communication among detectors. Each detector independently monitors and communicates with adjacent detectors on the interconnect loop, eliminating the central control panel's monopoly on system management. This segmentation creates multiple independent communication paths, improving reliability while reducing central complexity.
Solution Approach 2:
Detectors perform self-monitoring and self-diagnosis by detecting signal presence and timing from adjacent detectors. Each detector autonomously determines its own operational status and the status of neighbors without requiring centralized control, enabling the system to self-manage and detect faults independently.
2Reliability
If detectors are interconnected using traditional control bus topology, then communication is established between detectors and electrical panel, but disconnection or disablement of the bus disables all communication and prevents fault detection
Solution Approach 1:
The patent implements continuous feedback signaling where each detector sends periodic signals to adjacent detectors through the interconnect loop. By monitoring the presence, timing, and characteristics of these feedback signals, detectors can continuously assess the operational status of neighbors and detect faults such as disconnections, short circuits, or detector failures in real-time.
Solution Approach 2:
The system performs preliminary fault detection by continuously monitoring interconnect signals before actual communication failures occur. Detectors anticipate potential problems by detecting abnormal signal patterns, timing deviations, or signal losses, enabling early warning and prevention of complete communication breakdown.
3Adaptability or versatility
If multiple detectors are connected in a loop configuration with interconnect lines, then supervision between detectors is enabled without central control, but the system requires precise signal timing and coordination mechanisms
Solution Approach 1:
The patent employs periodic signaling where detectors transmit interconnect signals at regular intervals through the loop. This periodic action creates predictable signal patterns that simplify timing coordination, as each detector expects signals from neighbors at known intervals. The periodic nature enables easy detection of missing or delayed signals, facilitating fault detection while maintaining configuration flexibility.
Data Source
AI summary
A smoke alarm system for providing interconnect supervision between detectors includes smoke detectors configured so that an interconnect line extends between each of the smoke detectors. In one embodiment using a wired connection, each of the smoke detectors includes an interconnect input and an interconnect output for connecting the smoke detectors into a loop configuration. Similarly, the system may also operate to provide interconnect supervision in a wireless manner such that each of the smoke detectors is polled on a periodic basis. Thus, the smoke alarm system uses interconnect supervision for alerting other detectors of a smoke and/or carbon monoxide alarm as well as altering other detectors to a fault condition.