Decision-Making Controller Based on a Finite State Machine for Emergency Call Redirection System in Elevator Intercoms

Abstract

In the traditional setup, emergency elevator intercoms consisted of a station phone located in duty rooms and a cabin intercom situated inside elevator cabins. This configuration allowed cabin passengers to contact maintainers in case of emergencies. However, the lack of response from the responders could lead to confusion among cabin passengers. Hence, it is crucial for modern and high-grade elevators to incorporate a Call Redirection System (CRS) that enables the cabin intercom to switch to various high-end terminals such as station phones and mobile phones. This paper presents a decision-making algorithm based on a finite state machine, which determines the stages of the call redirection system based on the response of communication elements. The circuit design of the proposed CRS facilitates the connection between two cabin intercoms, two station phones, and the ability to dial up to ten sequential phone numbers on mobile phones. Additionally, the novel circuit design features one-touch emergency calling on cabin intercoms and guided automation tones. Despite comprising a discrete multi-state and multi-output algorithm, the proposed solution maintains a low computational cost, making it feasible to implement on a microcontroller integrated into the circuit design. To validate the functionality of the proposed algorithm and circuit design, several scenarios are provided to demonstrate the high-level decision-making process and behavioral reactions. The experimental results demonstrate that the proposed CRS can successfully establish connections between any cabin intercom and any station phone. However, the quality of the connection between a cabin intercom and a mobile phone depends on the signal strength of the network carrier.
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