Elevator Car Positioning via Code Tape Thermal Compensation
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Solution Overview
Problem
Elevator systems face position control errors due to code tape elongation or contraction caused by temperature changes, requiring multiple reference markers for accurate positioning, which increases installation and adjustment efforts.
Innovation Solution
An elevator device with a code tape, code read sensor, elongation/contraction detection unit, reference marker, and control unit that calculates compensatory position information based on detected elongation or contraction, allowing accurate car positioning without increasing the number of reference markers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple reference markers are installed to compensate for temperature-induced code tape elongation or contraction, then position control accuracy is improved, but installation complexity and adjustment effort increase
Solution Approach 1:
The system continuously monitors code tape elongation or contraction through temperature sensors and feedback control mechanisms. The control unit adjusts position information in real-time based on detected temperature changes, eliminating the need for multiple reference markers while maintaining position control accuracy.
Solution Approach 2:
The system changes the parameter being monitored from spatial distribution (multiple reference markers at different positions) to temporal variation (continuous temperature monitoring). By detecting temperature changes over time and calculating corresponding code tape dimensional changes, the system achieves compensation with a single reference marker.
2Device complexity
If a single reference marker is used to reduce installation effort, then installation complexity is reduced, but position control accuracy deteriorates due to uncorrected temperature-induced errors
Solution Approach 1:
The system introduces temperature sensors as intermediary devices that detect temperature changes and enable indirect measurement of code tape dimensional changes. This intermediary mechanism allows a single reference marker to suffice, as the temperature data compensates for the lack of multiple spatial reference points.
Solution Approach 2:
The system replaces the mechanical approach of using multiple physical reference markers with a sensor-based measurement and calculation system. Temperature sensors and control unit calculations substitute for the physical redundancy of multiple markers, achieving the same compensation effect through information processing rather than mechanical means.
3Measurement precision
If reference markers are installed at every floor position to maintain accuracy during code tape elongation or contraction, then position control accuracy is improved, but the number of components and adjustment time increase
Solution Approach 1:
The system uses continuous feedback from temperature sensors to dynamically adjust position information. This real-time feedback mechanism eliminates the need for pre-installation adjustment of multiple reference markers at each floor, as compensation occurs automatically during operation based on actual temperature conditions.
Solution Approach 2:
The system transitions from a static configuration requiring fixed reference markers at each floor to a dynamic compensation system that adapts to changing temperature conditions. The control unit continuously updates position information based on real-time temperature data, making the system flexible and responsive without requiring physical reconfiguration.
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
Enables accurate car position control even with temperature-induced code tape changes, reducing the need for additional reference markers and simplifying installation and adjustment processes.
Implementation Method 1
A code tape elongates or contracts due to a change in temperature
Data Source
AI summary
An elevator device includes: a car which travels through a hoistway; a code tape suspended in the hoistway; a code read sensor which reads a code described in the code tape; a code tape elongation/contraction detection unit which detects an amount of elongation or contraction of the code tape; a reference marker which is installed in the hoistway and which indicates a reference position of the car; a reference sensor which is installed in the car and which detects the reference marker; and a control unit which, when a condition based on the amount of elongation or contraction is satisfied, moves the car to the reference position in accordance with a detection result of the reference sensor, causes position information of the car to be read as reference position information, calculates compensatory position information based on the reference position information, and controls the car using the compensatory position information.