Lift Positioning via Movable 2D Code Band
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Solution Overview
Problem
Existing lift systems lack reliable and continuous position determination methods, leading to potential safety issues due to 'blind' travel and inadequate handling of building subsidence, which can cause lift cabins to become misaligned with the shaft frame.
Innovation Solution
A coding device with a movable code band using 2D codes and a computer-implemented method for image processing, position pattern analysis, extrapolation, and comparison, allowing for continuous position feedback and error correction, even in subsided buildings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discrete position markings are used on the code band, then the structure is simple and easy to manufacture, but the lift cabin cannot obtain continuous position information, leading to blind travel segments
Solution Approach 1:
The patent transitions from discrete 1D position markings to continuous 2D code patterns on the code band. The 2D codes enable the detector to read position information at any point along the travel path, transforming the information dimension from discrete segments to continuous coverage, thereby eliminating blind travel segments while maintaining manufacturing simplicity.
Solution Approach 2:
The code band with continuous 2D code markings enables the detector to continuously obtain position information throughout the entire travel path. This continuous information flow allows the control unit to maintain constant feedback control, eliminating the interruptions and blind segments that occur with discrete markings.
2Stability of the object's composition
If the code band is fixed rigidly in the lift shaft, then the structure is stable and simple, but building subsidence causes misalignment between the lift cabin and shaft frame
Solution Approach 1:
The code band is changed from a rigid fixed structure to a movable flexible structure that can dynamically adjust its position. The bearing devices allow the code band to move vertically within the lift shaft, enabling it to adapt to building subsidence while maintaining stable code patterns for accurate position detection.
Solution Approach 2:
The bearing devices act as intermediaries between the fixed shaft structure and the movable code band. These bearing devices absorb the effects of building subsidence by allowing controlled movement of the code band, thereby protecting the position determination system from misalignment while maintaining overall structural stability.
3Measurement precision
If traditional barcode markings are used on the code band, then the coding density is low and reading is simple, but the position information density and precision are insufficient
Solution Approach 1:
The patent employs 2D code patterns instead of traditional 1D barcodes, utilizing both horizontal and vertical dimensions to encode position information. This dimensional expansion dramatically increases the information density and measurement precision while the detector and control unit are designed to process these enhanced 2D patterns effectively.
4Device complexity
If the lift cabin operates without continuous position feedback, then the control system is simpler, but safety is compromised due to blind travel segments
Solution Approach 1:
The continuous 2D code reading system provides real-time position feedback to the control unit throughout the entire travel path. This continuous feedback enables the control system to maintain constant monitoring and control, significantly improving operational safety while the automated nature of the feedback process keeps the added complexity manageable.
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
Ensures high safety and reliability by providing continuous position information and correcting for building subsidence, preventing misalignment and enhancing operational safety and accuracy.
Implementation Method 1
A section of a code band and/or of the bearing device is recorded with an optical detection device as a pixel image
Data Source
AI summary
In order to increase safety, a computer-implemented method is proposed for determining the position of a lift cabin in a lift shaft with the aid of a coding device, which comprises a code band as a marking, wherein the position is determined analytically by means of an algorithm on the basis of the code of the marking, wherein an extrapolated position is determined from the stored positions and the instant of the recording and, in turn, a coding pattern to be compared in relation to the recording is calculated by inverting the algorithm.