Landing Door Voltage Signal Bridging for Fault Localization
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Solution Overview
Problem
Existing elevator systems face challenges in accurately identifying and locating landing door faults, which can lead to unsafe operation due to the inability to determine which landing door has failed, causing the entire system to stop running.
Innovation Solution
A voltage signal processing unit and landing door fault location system that includes a first and second voltage signal input port, a first electrical level signal output port, a voltage signal bridge circuit with a normally open relay switch, and a logic control module to detect and locate landing door faults by collecting and bridging voltage signals across multiple landing stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple landing door switch assemblies are connected in series to ensure safety, then the safety of the elevator system is improved, but the ability to locate specific faults deteriorates
Solution Approach 1:
The patent divides the series-connected landing door safety circuit into multiple independently detectable segments by adding parallel voltage signal processing units at each floor. Each processing unit monitors the voltage signal at its specific location, allowing the system to segment the fault detection process while maintaining the series connection for safety. This enables identification of which specific floor has a fault without breaking the safety circuit architecture.
Solution Approach 2:
The patent introduces voltage signal processing units as intermediary devices between the series-connected landing door switch assemblies. These intermediaries collect and process voltage signals at each floor, acting as mediators that translate the collective safety signal into location-specific fault information. The processing units include voltage collection circuits, isolation devices, and signal processing components that enable fault location without disrupting the series safety circuit.
2Reliability
If the entire landing door safety circuit stops operation when a fault occurs, then system safety is ensured, but system productivity deteriorates due to unnecessary shutdowns
Solution Approach 1:
The patent segments the fault detection and response process by implementing floor-specific voltage signal processing units. When a fault is detected at a specific floor, the system can identify and isolate that particular fault location while maintaining operation capability for other floors. This segmentation allows selective response rather than blanket system shutdown, improving productivity while maintaining safety through precise fault localization.
Solution Approach 2:
The patent implements a feedback mechanism where voltage signal processing units continuously monitor the landing door safety circuit at each floor and provide real-time fault location information to the control system. This feedback enables the control system to make informed decisions about whether to shut down the entire system or allow continued operation with isolated faults, thereby optimizing productivity while maintaining safety through intelligent decision-making based on localized fault detection.
3Measurement precision
If a voltage signal processing unit is added to each floor for fault detection, then fault location precision is improved, but device complexity increases
Solution Approach 1:
The patent designs the voltage signal processing unit as a universal, multi-functional module that can be replicated at each floor. Each processing unit performs multiple functions: voltage signal collection, isolation, processing, and fault detection. This universal design reduces overall system complexity by using standardized components rather than custom solutions for each floor, while still achieving high fault location precision through consistent multi-functional processing at every level.
Solution Approach 2:
The patent employs a copying strategy by replicating the same voltage signal processing unit design across multiple floors. Instead of designing unique processing circuits for each floor, the system copies a standardized processing module that includes voltage collection circuits, isolation devices, and signal processing components. This copying approach simplifies the overall system architecture by reducing design complexity and facilitating easier installation and maintenance while maintaining high measurement precision through consistent processing at each location.
Data Source
AI summary
A voltage signal processing unit, a landing door fault location system and method, and an elevator system. The voltage signal processing unit includes: a first voltage signal input port; a second voltage signal input port; a first electrical level signal output port; a first voltage signal collection circuit, the first voltage signal collection circuit terminates with the first voltage signal input port and the first electrical level signal output port, the first voltage signal collection circuit is adapted to collect a first voltage signal received from the first voltage signal input port as a first electrical level signal output from the first electrical level signal output port; and a voltage signal bridge circuit, the voltage signal bridge circuit terminates with the first voltage signal input port and the second voltage signal input port, a normally open relay switch is provided.