Angle Sensor Correction Using Adaptive Signal Processing
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Solution Overview
Problem
Existing angle sensors face challenges in reducing angular errors, particularly when detecting angles with a variation range of less than 360°, as existing correction methods are not applicable to such systems and fail to effectively eliminate error components in detection signals.
Innovation Solution
A correction apparatus for angle sensors that includes a correction processing unit, an indicator value generation unit, and a correction information determination unit, utilizing adaptive signal processing and a recursive least square algorithm to reduce angular errors by determining correction information and performing correction processing based on this information, even for angles with a variation range less than 360°.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing correction methods are used for angle sensors, then angular errors can be reduced for full 360° rotation, but these methods become inapplicable when detecting angles with a variation range of less than 360°
Solution Approach 1:
The invention changes the fundamental parameters of the correction approach by using adaptive signal processing with recursive least square algorithms instead of traditional correction methods. This allows the system to dynamically adjust correction factors based on the actual detection signals, making it applicable to both full 360° rotation and limited angle ranges. The correction information determination unit adapts the correction parameters according to the specific angle variation range, resolving the contradiction between measurement precision and adaptability.
2Measurement precision
If traditional correction techniques are applied, then detection accuracy improves for standard applications, but error components cannot be effectively eliminated in limited angle range applications
Solution Approach 1:
The invention implements a feedback mechanism where the correction information determination unit continuously processes detection signals and generates correction information that is fed back to the correction processing unit. This closed-loop approach using adaptive signal processing allows the system to effectively eliminate error components by continuously adjusting correction factors based on the actual signal characteristics, thereby improving both detection accuracy and reliability for limited angle range applications.
Solution Approach 2:
The invention replaces traditional mechanical or fixed correction methods with an electronic adaptive signal processing system. By using recursive least square algorithms and adaptive filters, the system dynamically computes correction factors without requiring mechanical adjustments or fixed correction tables, enabling effective error component elimination across different angle ranges including limited ranges.
3Device complexity
If no correction processing is performed, then device complexity remains low, but angular errors in detected angle values remain significant
Solution Approach 1:
The invention designs a universal correction apparatus that can handle multiple correction tasks through a single integrated system. The correction processing unit, indicator value generation unit, and correction information determination unit work together to provide comprehensive correction functionality that addresses various error sources (amplitude errors, phase errors, offset errors) in a unified manner, achieving high measurement precision without proportionally increasing device complexity.
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 solution effectively reduces angular errors in angle sensors used for detecting angles with a variation range less than 360° by determining and applying correction information through adaptive signal processing, improving the accuracy of detected angle values.
Implementation Method 1
The magnetic detection element 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
A correction apparatus for an angle sensor includes a correction processing unit, an indicator value generation unit, and a correction information determination unit. The correction processing unit performs correction processing on a plurality of detection signals to reduce an error of a detected angle value. The details of the correction processing are determined according to correction information. The indicator value generation unit generates, on the basis of the plurality of detection signals, an indicator value having a correspondence with the error of the detected angle value. The correction information determination unit generates an estimated indicator value using a function that takes one or more values each having a correspondence with the correction information as one or more variables, and determines the correction information by adaptive signal processing so as to reduce the difference between the indicator value and the estimated indicator value.