Single-Track Magnetic Position Sensor Adaptation
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Solution Overview
Problem
Existing absolute measuring magnetic position sensors are not adaptable to different magnetic code objects, suffer from reduced measuring resolution due to magnetic disturbances, are sensitive to misalignments, and fail with errors like mechanical wear or magnetization changes, and are not compatible with circularly curved code strips of varying diameters.
Innovation Solution
A method for operating an absolute measuring linear position detection system using a linear arrangement of magnetic field sensors that identifies the most similar partial pattern in a detected magnetic field signal to a predetermined pattern, employing correlation techniques, artificial neural networks, and self-diagnosis to adapt to various code objects and misalignments, and learns maps of magnetic field profiles during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If parallel tracks are used for absolute positioning, then absolute position measurement is enabled, but magnetic disturbances reduce measuring resolution and reading distance
Solution Approach 1:
The patent extracts the absolute positioning function from a separate parallel track and integrates it into the single-track design. The absolute position information is encoded within the same magnetic code strip using a special non-repeating bit sequence, eliminating the need for a second track and thus removing the source of magnetic interference between tracks.
Solution Approach 2:
The patent combines absolute and incremental positioning functions into a single magnetic code track. The absolute code is embedded within the same physical track as the incremental code, merging two previously separate functions into one integrated system that avoids mutual interference.
2Adaptability or versatility
If sensor elements are arranged to detect magnetic fields in three spatial directions, then misalignment tolerance is improved, but device complexity increases
Solution Approach 1:
The patent implements three-axis magnetic field detection at each sensor element location, where each sensor element measures magnetic field components in three spatial directions. This local three-dimensional measurement capability provides tolerance to misalignments without requiring complex overall system architecture.
3Device complexity
If a single-track magnetic code object is used, then device complexity is reduced, but adaptability to different magnetic code objects is limited
Solution Approach 1:
The patent creates a universal single-track magnetic code object that can serve multiple functions simultaneously. The code structure is designed to provide both absolute positioning information through a non-repeating bit sequence and incremental positioning information through regular bit patterns, making it compatible with different application requirements without needing multiple specialized code objects.
Solution Approach 2:
The patent employs dynamic adaptation in the evaluation unit, which can interpret different magnetic code patterns and adjust its processing accordingly. The system can handle variations in magnetic code objects by dynamically adapting its signal processing and position calculation algorithms based on the detected code structure.
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 reliable operation with high error tolerance, increased reading distance, and compatibility with different code objects, including circularly curved strips, by adapting to changes and misalignments, and maintaining measurement resolution over the system's lifetime.
Implementation Method 1
a linear arrangement of a plurality of magnetic field sensors and a single and single-track magnetic code object
Data Source
AI summary
In a method for operating an absolute measuring position detection system having a sensor arrangement (100) and a single-track magnetic code object (105) with non-repeating code regions, wherein the sensor arrangement (100) is formed by a substantially linear arrangement of a plurality of magnetic field sensors (110), it is provided in particular that the relative position of the sensor arrangement (100) with respect to the respective code object (105) is determined by searching for a partial pattern which is most similar to a currently sensor-detected partial pattern on the basis of available reference data containing magnetic curve progressions or magnetic patterns of magnetic field vector components detected by sensors for the entire code object (105) depending on the position on the code object (105).