Elevator Door Fault Detection via Serial Interface Signals

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Solution Overview

Problem

Existing methods for detecting elevator door-opening operation faults are difficult to popularize and apply due to complex installation processes and higher installation costs.

Innovation Solution

A method and apparatus for monitoring elevator door-opening operation faults by acquiring elevator control signals from a serial interface between the elevator controller and the control box using a data acquisition device, and determining faults based on these signals without the need for additional door detectors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an elevator door detector is additionally provided to detect door-opening operation faults, then the detection capability is improved, but the installation complexity and cost increase

Engineering Contradiction:

Improvedoor fault detection capabilityVSAvoidinstallation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The elevator controller utilizes its own existing serial interface and data transmission capabilities to monitor door control signals, eliminating the need for external door detectors. The controller serves itself by processing door status information that is already being transmitted within the system for normal operation.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The serial interface and data acquisition system are designed to serve multiple functions: normal elevator control operations and door fault detection. By analyzing existing door control signals already present in the system, the same communication infrastructure performs dual purposes without requiring dedicated detection hardware.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If an elevator door detector is additionally provided to detect door-opening operation faults, then the detection capability is improved, but the installation cost increases

Engineering Contradiction:

Improvedoor fault detection capabilityVSAvoidinstallation cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Instead of installing physical door detectors, the system creates a virtual copy of door status monitoring by acquiring and analyzing door control signals that already exist in the serial communication between the controller and control box. This software-based approach replaces hardware installation.

Inventive Principle:

Principle #26Copying

3Ease of operation

If existing serial interfaces are utilized for fault detection, then the installation simplicity is improved, but the detection accuracy must be maintained

Engineering Contradiction:

Improveinstallation simplicityVSAvoidfault detection accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The system continuously monitors door control signals through the serial interface and compares actual door status with expected status based on control commands. When discrepancies are detected (e.g., door should be closed but remains open), the system generates fault alerts, providing continuous feedback on system integrity.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces physical door detectors with a software-based signal analysis system that processes electrical signals through the existing serial communication interface. This substitution maintains detection accuracy by analyzing the digital door control signals already present in the system rather than using separate sensing mechanisms.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS12221322B2Method and apparatus for monitoring elevator door-opening operation fault

Publication Date: 2025.02.11 SHENZHEN TECH UNIV

AI summary

The present invention discloses a method and an apparatus for monitoring an elevator door-opening operation fault. The method includes: acquiring elevator control signals from a serial interface between an elevator controller and a control box by using a preset data acquisition device, wherein the elevator control signals include an elevator operation signal, an elevator door control signal, an elevator internal call signal and an elevator floor signal; monitoring whether there is an elevator door fault in the elevator based on the elevator operation signal, the elevator door control signal and the elevator floor signal; when there is the elevator door fault in the elevator and the elevator internal call signal is in a preset level state, determining that there is the elevator door-opening operation fault in the elevator. The present invention is lower in use cost and may be easily popularized and applied.