Angle Sensor Condition Determination Using Dynamic Thresholds
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Solution Overview
Problem
Existing angle sensors face challenges in accurately determining their condition due to variations in detection signals caused by factors like magnetic anisotropy and manufacturing inaccuracies, leading to incorrect failure detection and reduced accuracy in determining the sensor's operational status.
Innovation Solution
A condition determination apparatus that generates determination values based on detection signals and adjusts threshold values to minimize variations caused by the physical quantity being measured, ensuring accurate detection of the sensor's condition by differentiating between ideal and error components in the signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed threshold value is used for condition determination, then the device complexity is reduced, but the measurement precision deteriorates due to variations in determination values caused by magnetic anisotropy and manufacturing inaccuracies
Solution Approach 1:
The patent applies dynamics by making the threshold value adjustable rather than fixed. The determination unit varies the threshold value based on the detected physical quantity to compensate for variations in determination values caused by magnetic anisotropy and manufacturing inaccuracies, thereby maintaining measurement precision without excessive complexity
Solution Approach 2:
The patent changes the parameter of the threshold value dynamically. By adjusting the threshold value according to the detected physical quantity (such as angle), the system compensates for variations in determination values, improving condition determination accuracy while managing device complexity
2Ease of operation
If the determination range is widened to accommodate variations, then the reliability of failure detection is reduced, but the ease of operation is improved
Solution Approach 1:
The patent uses dynamics by making the threshold value variable rather than fixed. This allows the determination range to adapt to different operating conditions, maintaining reliable failure detection while simplifying operation. The system automatically adjusts the threshold based on the detected physical quantity, eliminating the need for manual calibration
Solution Approach 2:
The patent implements feedback by using the detected physical quantity to adjust the threshold value. The determination unit continuously monitors the determination value and adjusts the threshold accordingly, creating a closed-loop system that maintains high reliability while being easy to operate
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
This approach enables precise determination of the angle sensor's condition, reducing false failure detection and improving overall accuracy by narrowing the range of threshold value variations, thus ensuring reliable operation.
Implementation Method 1
Each of the plurality of magnetic detection elements includes, for example, a spin-valve magnetoresistance (MR) element including a magnetization pinned layer whose magnetization direction is pinned, a free layer whose magnetization direction varies depending on the direction of the rotating magnetic field
Data Source
AI summary
An angle sensor includes a detection signal generation unit for generating a plurality of detection signals, an angle detection unit for generating a detected angle value by performing an operation using the plural of detection signals, and a condition determination apparatus. The condition determination apparatus includes a determination value generation unit and a determination unit. The determination value generation unit performs an operation using the plurality of detection signals to generate a determination value corresponding to the condition of the angle sensor. The determination value varies depending on an angle to be detected. The determination unit determines whether the angle sensor is in a predetermined condition by determining whether the determination value falls within a determination range. The determination unit varies at least one threshold value that represents at least one end of the determination range.