Elevator Car Movement Monitoring with Verified Ride Events
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Solution Overview
Problem
Existing elevator car movement monitoring systems face challenges in accurately detecting the start and end of elevator rides, particularly in two-speed systems, leading to incorrect measurement data and unreliable maintenance needs determination.
Innovation Solution
An elevator car movement monitoring system comprising an accelerometer and a data collection unit that verifies the detection of elevator car start and stop events through various verification actions, including duration, direction, state, and ride completeness checks, ensuring accurate measurement of elevator ride data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If movement data is measured only when the elevator car is moving, then energy consumption is reduced, but measurement precision deteriorates due to incorrect detection of ride start and end events
Solution Approach 1:
The system performs preliminary actions by detecting potential ride start events before actual movement begins, using acceleration thresholds and verification mechanisms to prepare for accurate measurement capture. The verification actions check whether detected events truly represent ride boundaries, preventing premature or false measurement initiation.
Solution Approach 2:
The system implements feedback through verification actions that continuously monitor detected ride events. When a ride start or end event is detected, the system verifies it against expected patterns (e.g., checking if deceleration matches terminal deceleration patterns) and corrects false detections, ensuring measurement precision while maintaining energy efficiency.
2Measurement precision
If verification actions are added to detect ride events, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The verification process is segmented into distinct actions: detecting potential ride events, verifying each event against specific criteria (duration, acceleration patterns), and correcting false detections. This segmentation allows the system to achieve high measurement precision through multiple focused checks rather than a single complex verification mechanism.
Solution Approach 2:
The system performs self-verification of detected events using its own sensor data and predefined criteria. The verification actions use the accelerometer data itself to validate detected ride events, eliminating the need for external verification systems and reducing overall device complexity while maintaining high measurement precision.
3Measurement precision
If constant measurement is performed, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
Instead of constant measurement, the system performs periodic measurement triggered by detected ride events. The accelerometer continuously monitors for potential ride starts using predefined acceleration thresholds, and full measurement cycles are initiated only when events are detected and verified, reducing energy consumption while maintaining measurement precision through event-driven sampling.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the reliability of elevator car movement monitoring by correcting errors in detected events and ensuring complete and accurate data capture, thereby improving maintenance need determination.
Implementation Method 1
an accelerometer attached to an elevator car and configured to produce acceleration data representing acceleration of the elevator car
Data Source
AI summary
An elevator car movement monitoring system includes an accelerometer and a data collection unit. The Accelerometer is attached to an elevator car and configured to produce acceleration representing acceleration of the elevator car. The data collection unit is configured to: obtain the acceleration data from the accelerometer; detect an elevator car start event and an elevator car stop event from the acceleration data, the acceleration data between the detected elevator car start event and the detected elevator car stop event representing elevator ride acceleration data; and execute at least one verification action to verify a correct detection the elevator car start event and/or the elevator car stop event. A method and an elevator system monitor elevator car movement.