Elevator Door Switch Failure Diagnosis Control
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Solution Overview
Problem
Conventional elevator systems face challenges in accurately determining door switch failures without causing users to board the elevator by mistake during diagnostic operations, leading to potential misinterpretation of elevator malfunctions by bystanders.
Innovation Solution
A control device for elevators that includes run control means to stop the car at a diagnostic floor, door opening and closing control means to limit the door opening width, and failure determination means to assess the door switch condition based on its action during controlled opening and closing operations, preventing user boarding and misinterpretation of elevator failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the door is opened and closed to diagnose door switch failure, then the diagnosis accuracy is improved, but users may board the car by mistake
Solution Approach 1:
The control device performs preliminary actions by switching off car lighting and making announcements before conducting the door switch failure diagnosis. These preliminary actions warn users that the elevator is in diagnostic mode and the door will be opened and closed, preventing them from boarding the car by mistake while still allowing the diagnosis to proceed
Solution Approach 2:
The control device acts as an intermediary between the door switch diagnosis process and the users. It mediates by detecting door opening/closing actions and implementing safety measures (lighting control, announcements) to prevent user boarding during the diagnostic operation, thus resolving the conflict between diagnosis accuracy and user safety
2Measurement precision
If the door is opened and closed during failure diagnosis, then the door switch condition can be determined, but bystanders may mistake the action for elevator malfunction
Solution Approach 1:
The control device makes preliminary announcements to inform building occupants that the elevator is performing maintenance diagnostics. This preliminary information provision prevents bystanders from misinterpreting the door opening/closing actions as elevator malfunctions, while still allowing the door switch failure diagnosis to be conducted accurately
Solution Approach 2:
The control device provides feedback to bystanders through announcements and lighting control, explaining that the door movements are part of a scheduled diagnostic routine. This feedback mechanism maintains clear communication about the elevator's actual status, preventing misinformation while enabling accurate door switch detection
Data Source
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AI summary
Provided is a control device of an elevator which positively prevents users from boarding a car by mistake during the failure diagnosis of a door switch and ensures that the surrounding people do not mistake the action during the failure diagnosis for a failure of the elevator. During a self-diagnosis of a door switch, the elevator door is caused to open beyond an action position of the door switch and the door is caused to close without causing the door to open to a width which is not less than a prescribed specified width through which an elevator user cannot pass. A determination is made as to the existence or nonexistence of a failure of the door switch on the basis of the action condition of the door switch occurring when such door opening and closing actions are carried out.