Dynamic Elevator Levelling Speed Control for UCMP Safety
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Solution Overview
Problem
Existing elevator systems face challenges in accurately stopping the elevator car within a predetermined distance from the landing, especially when the elevator car moves away from the unlocking zone at a speed close to the fixed levelling speed limit, which can lead to longer reaction times and potential safety hazards.
Innovation Solution
A method and system for dynamically adjusting the levelling speed limit of the elevator car during the levelling operation, using sensors such as position, acceleration, and magnetic sensors to adjust the speed limit based on the elevator car's speed, thereby improving Unintended Car Movement Protection (UCMP) and preventing the elevator car from leaving the unlocking zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed levelling speed limit is set for the elevator car, then the speed control during levelling operation is simplified, but the reaction time to stop the elevator car within predetermined distance increases
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed levelling speed limit to a dynamically adjusted speed limit that changes based on the elevator car's actual speed. The control unit continuously monitors the car's speed and adjusts the speed limit accordingly, allowing the system to adapt to real-time conditions rather than relying on a static predetermined value
Solution Approach 2:
The patent implements feedback by using sensors to detect the elevator car's speed and feeding this information back to the control unit. The control unit then uses this feedback to dynamically adjust the levelling speed limit, creating a closed-loop control system that responds to actual operating conditions and enables faster reaction to speed deviations
2Productivity
If the levelling speed limit is set higher, then the levelling operation efficiency is improved, but the distance the elevator car moves away from the landing increases
Solution Approach 1:
The system dynamically adjusts the speed limit during levelling operation based on real-time speed measurements. When the car approaches the landing, the system can maintain higher speeds initially for efficiency, then automatically reduce the speed limit as the car gets closer, ensuring the car stops within the predetermined distance while maximizing overall levelling efficiency
Solution Approach 2:
The system performs preliminary speed detection and adjustment before the elevator car reaches the critical stopping zone. By monitoring speed continuously and proactively adjusting the speed limit in advance, the system prepares for the upcoming stop, allowing efficient high-speed operation earlier in the levelling process while ensuring controlled deceleration near the landing
Data Source
AI summary
A method for dynamically adjusting a levelling speed limit of an elevator car during a levelling operation includes obtaining an indication that the elevator car is detected to arrive to a zone; obtaining at least one value indicating the speed of the elevator car, in response to detecting that the elevator car arrives to the zone; and dynamically adjusting the levelling speed limit of the elevator car based on the speed of the elevator car. An elevator control unit and a system are provided to perform at least partly the method.