Landing Door Switch Group Detection for Faster Elevator Fault Isolation
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Solution Overview
Problem
Elevator systems face delays and safety risks due to the failure of landing door switches, as the breakdown of a single switch in the series-connected safety chain leads to an emergency stop, trapping passengers and requiring lengthy troubleshooting.
Innovation Solution
The landing door switches are organized into switch groups and connected via signal input and output lines, with a controller applying detection signals sequentially to determine the state of each switch, using a controller connected to I/O channels and SPI input channels for reliable detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If landing door switches are connected in series to form a safety chain, then safety monitoring is achieved, but troubleshooting time increases when a switch fails
Solution Approach 1:
The patent divides the series-connected landing door switches into multiple parallel groups (first group, second group, etc.), where each group contains switches connected in series. This segmentation allows the system to monitor multiple independent safety chains simultaneously, so when a fault occurs in one group, other groups can continue to function, enabling faster fault isolation and reduced troubleshooting time while maintaining overall safety monitoring capability.
2Reliability
If a single landing door switch fails in the series safety chain, then safety is maintained by emergency stop, but passenger wait time increases
Solution Approach 1:
The patent implements different connection configurations for different groups of landing door switches, creating local variations in the safety chain structure. By organizing switches into multiple parallel groups rather than a single series chain, the system achieves local redundancy where failure in one local group does not affect other groups, thereby maintaining overall system functionality and reducing passenger wait time during fault conditions.
3Measurement precision
If multiple landing door switches are monitored individually, then fault location is accurate, but system complexity increases
Solution Approach 1:
The patent segments the large number of landing door switches into multiple manageable groups, where each group is monitored as a distinct unit. This segmentation enables the control system to identify which specific group contains a fault through group-level monitoring, and then narrow down the exact faulty switch within that group, achieving accurate fault location while keeping the monitoring system complexity manageable through hierarchical organization.
Data Source
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AI summary
The present disclosure relates to elevator technology and, in particular, to a method and device for detecting states of a plurality of landing door switches, an elevator system comprising the device, a non-transitory computer-readable storage medium for implementing the method, and a computer program product. In some embodiments, the plurality of landing door switches are divided into m switch groups. The device for detecting the states of the plurality of landing door switches includes m signal input lines and n signal output lines. Each signal input line is connected with a first end or input end of each landing door switch within one of the m switch groups, and each signal output line is connected with a second end or output end of one of the landing door switches within each of the m switch groups. A controller is connected with the m signal input lines and the n signal output lines, and is configured to apply a detection signal onto the ith signal input line and determine the state of each landing door switch of the switch group connected with the ith signal input line based on a response signal on a respective one of the n signal output lines.