Foldable Hinge Angle Estimation Using Magnetic Hysteresis References
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Solution Overview
Problem
Existing technologies face challenges in accurately estimating the angle between foldable device components due to variations in magnetic fields caused by hysteresis and external magnetic interference, leading to inaccuracies in determining the operational state of foldable devices.
Innovation Solution
A system utilizing a magnet section and magnetic sensor to measure magnetic flux density, combined with reference information and an estimation apparatus that identifies the angle based on hysteresis curves, compensates for hysteresis and external interference by using multiple reference information sets to accurately estimate the angle between device components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic sensor is used to detect the angle between hinge portions, then the angle can be detected, but the detection accuracy deteriorates due to hysteresis and external magnetic interference
Solution Approach 1:
The patent performs preliminary actions by measuring magnetic flux density at multiple predetermined positions along the hinge portion before actual angle detection. These preliminary measurements create reference data that compensates for hysteresis effects during subsequent angle detection operations, thereby maintaining high measurement precision despite the presence of hysteresis and external magnetic interference.
2Measurement precision
If multiple magnetic sensors are used to improve detection accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent segments the hinge portion into multiple predetermined positions along its length, with each position having its own magnetic sensor. This segmentation allows the system to measure magnetic flux density at different locations independently, creating a distributed measurement system that improves angle estimation accuracy while keeping each individual sensor unit simple and manageable.
Solution Approach 2:
The patent introduces a spatial dimension by arranging magnetic sensors at multiple predetermined positions along the hinge portion rather than using a single sensor. This dimensional arrangement transforms the detection problem from a single-point measurement to a distributed spatial measurement system, improving accuracy through geometric distribution of sensors without requiring complex processing.
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
The system provides precise angle estimation, enabling accurate determination of the operational state of foldable devices, even in the presence of hysteresis and external magnetic interference, thereby enhancing the functionality and usability of foldable devices.
Implementation Method 1
a magnetic sensor to measure magnetic flux density
Implementation Method 2
compensates for hysteresis and external interference by using multiple reference information sets
Data Source
AI summary
Provided is an estimation apparatus for estimating a position or an attitude of a second portion with respect to a first portion in an apparatus including the first portion, the second portion, a movable mechanism, a magnetic sensor, and a magnet section. The estimation apparatus includes an estimation unit which performs, based on a combination of measured values and reference information, an estimation of the position or the attitude of the second portion with respect to the first portion. The reference information includes first reference information and second reference information. The estimation apparatus includes a selection unit which selects, according to a degree of coincidence between the combination of the measured values and each of the first reference information and the second reference information, the first reference information or the second reference information which has a higher degree of coincidence as the reference information for the estimation.