Elevator Emergency Call Detection Using Retained Calling State
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Solution Overview
Problem
Existing emergency report systems for elevators fail to detect continuous operation of a calling device when the calling state is retained after the operation is finished, leading to unnecessary communication and increased costs.
Innovation Solution
An emergency report system with a state storing unit that retains the calling state after the operation of a calling device is finished and a detection unit that cancels the stored state at a set interval to detect continuous operation, enabling differentiation between necessary and unnecessary communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the calling state is retained after the operation of the calling device is finished, then the user can easily initiate calls, but the system cannot detect continuous operation leading to unnecessary communication
Solution Approach 1:
The detection unit performs periodic checks at predetermined time intervals to determine whether the calling state is being retained. By periodically canceling the stored calling state and checking if it is re-stored, the system can detect continuous operation while allowing temporary releases of the calling device, thus resolving the contradiction between ease of operation and detection reliability.
2Loss of energy
If the system detects continuous operation based on retained calling state, then unnecessary communication is reduced, but the complexity of the detection mechanism increases
Solution Approach 1:
The system utilizes the existing retained calling state function of the interphone device for detection purposes. The detection unit simply monitors whether the calling state is re-stored after periodic cancellation, leveraging the device's own state retention mechanism rather than requiring additional complex detection hardware, thus reducing communication costs without significantly increasing system complexity.
3Reliability
If the calling state is continuously monitored without cancellation, then continuous operation can be detected, but the system cannot distinguish between temporary release and continuous operation
Solution Approach 1:
The detection unit cancels the stored calling state at predetermined time intervals before checking whether it is re-stored. This preliminary cancellation action creates a reference point that allows the system to distinguish between temporary releases (where the state is not re-stored) and continuous operation (where the state is re-stored), thereby maintaining detection accuracy while preserving operation continuity information.
Data Source
AI summary
An object of the present invention is to provide an emergency report system (1) that may detect that pressing of a phone call button (13) is continued based on a calling state retained even after pressing of the phone call button (13) is finished. The calling state is stored when the phone call button (13) of an interphone extension unit (8) is pressed inside a car (6). Storing of the calling state is retained even after pressing of the phone call button (13) is finished. Continuation of pressing of the phone call button (13) is detected by detecting storing of the calling state performed again, the storing being canceled at a time interval set in advance.