Elevator Door Safety Circuit Timestamp Analysis
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Solution Overview
Problem
Elevator door system malfunctions often go unnoticed for a long time, leading to reduced availability and delayed maintenance, as users or automated systems take time to report issues, causing operational delays and safety concerns.
Innovation Solution
A method and system for generating maintenance data by detecting events related to safety contacts and door motor current, comparing timestamps and deviation values to predict maintenance needs, and sending alerts for immediate or predictive maintenance, utilizing a computing unit and detection unit to analyze and store data for real-time notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional manual reporting of elevator failures is used, then users can report issues, but the detection time is delayed and elevator availability is reduced
Solution Approach 1:
The elevator door system performs self-diagnosis by automatically monitoring safety contact status and detecting anomalies without requiring user intervention. The door control unit continuously analyzes door operation data and identifies maintenance needs autonomously, eliminating the delay associated with manual user reporting.
Solution Approach 2:
The system implements continuous feedback monitoring of safety contact states during door operations. By comparing actual safety contact status against expected states and analyzing timing patterns, the system provides real-time feedback on door system health, enabling immediate detection and notification of maintenance requirements.
2Measurement precision
If safety contacts are monitored manually, then maintenance can be performed, but the monitoring complexity increases and early detection capability is reduced
Solution Approach 1:
The door control unit performs multiple functions including normal door operation control, safety contact monitoring, anomaly detection, and maintenance scheduling. By consolidating these functions into a single control unit, the system achieves precise maintenance detection without significantly increasing overall system complexity.
Solution Approach 2:
The system replaces manual mechanical inspection of safety contacts with electronic monitoring and automated analysis. The door control unit electronically tracks safety contact states and uses algorithmic analysis to detect anomalies, providing more precise detection while reducing the complexity of manual monitoring procedures.
Data Source
AI summary
A method for generating maintenance data of an elevator door system includes detecting a first event during closing or opening of a door of the elevator door system and defining a time stamp of the first event, wherein the first event is opening or closing of a safety circuit; detecting at least one second event during said closing or opening of the door of the elevator door system and defining time stamp of the at least one second event; defining a difference value by comparing the time stamp of the first event and the time stamp of the at least one second event; comparing the difference value to previously stored one or more difference values; and generating maintenance data of the elevator door system. A system is provided to perform at least partly the method.