Angle Sensor Noise Error Reduction via Multi-Unit Signal Processing
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Solution Overview
Problem
Existing angle sensors face challenges in reducing angular errors caused by noise magnetic fields without introducing structural or installation limitations, particularly in applications like automotive steering systems where precise angle detection is crucial.
Innovation Solution
The angle sensor system employs multiple detection units positioned differently to detect composite magnetic fields, generating pairs of detection signals that are used by an angle computation unit to minimize angular errors through signal processing, including methods like least squares estimation, without requiring specific magnetic field generation patterns or limited installation configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic field generation unit is used to generate a rotating magnetic field with specific patterns (first and second partial magnetic fields 180° apart), then angular error caused by noise magnetic fields is reduced, but structural complexity and installation limitations increase
Solution Approach 1:
The patent extracts and eliminates the complex magnetic field generation unit from the angle sensor system. Instead of using a rotating magnetic field generation unit with specific patterns, the invention uses multiple detection units that detect magnetic fields at different positions, and the angle computation unit processes these signals computationally to achieve angular error reduction without the complex hardware structure.
Solution Approach 2:
The patent replaces the mechanical/magnetic field generation approach with a computational approach. Instead of physically generating rotating magnetic fields with specific patterns using magnets and coils, the system uses multiple detection units to capture magnetic field information and employs computational algorithms in the angle computation unit to achieve the same angular error reduction effect.
2Measurement precision
If detection units are positioned at specific locations to detect composite magnetic fields, then angular error is reduced, but installation flexibility is limited
Solution Approach 1:
The patent creates a universal angle sensor system that can be installed in various configurations and positions. The multiple detection units are designed to detect magnetic fields at different positions, and the angle computation unit processes signals from any arrangement of detection units, making the system adaptable to different installation environments without requiring specific positioning.
Solution Approach 2:
The patent changes the approach from fixed positional requirements to flexible parameter-based processing. Instead of requiring detection units to be at specific locations, the system accepts magnetic field detection data from various positions and uses computational methods to process these varying parameters, enabling installation flexibility while maintaining angular error reduction.
3Measurement precision
If multiple detection units are used to detect composite magnetic fields at different positions, then angular error caused by noise magnetic fields is reduced, but device complexity increases
Solution Approach 1:
The patent introduces an angle computation unit as an intermediary that processes signals from multiple detection units. This computation unit performs computational operations to combine the detection signals and eliminate angular errors caused by noise magnetic fields, achieving high measurement precision while managing the complexity of having multiple detection units through intelligent signal 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
This approach effectively reduces angular errors caused by noise magnetic fields, providing more accurate angle detection without imposing substantial structural or installation constraints, thus enhancing the reliability of angle sensing systems.
Implementation Method 1
Each of the plurality of detection units includes a first detection signal generation unit for generating a first detection signal representing the strength of a component in a first direction of the composite magnetic field, and a second detection signal generation unit for generating a second detection signal representing the strength of a component in a second direction of the composite magnetic field
Data Source
AI summary
An angle sensor includes detection units and an angle computation unit. The detection units detect a composite magnetic field of a magnetic field to be detected and a noise magnetic field. Each detection unit generates a first detection signal representing the strength of a component in a first direction of the composite magnetic field, and a second detection signal representing the strength of a component in a second direction of the composite magnetic field. The angle computation unit generates a detected angle value by performing computations using a plurality of pairs of first and second detection signals generated at the detection units wherein an error of the detected angle value resulting from the noise magnetic field is made smaller than in the case of generating the detected angle value on the basis of only a pair of first and second detection signals generated at any one of the detection units.