Clutch Actuator Angle Sensing With Harmonic Error Correction
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Solution Overview
Problem
Existing methods for detecting the angular position of rotational components are hindered by harmonic interference, leading to inaccuracies and increased calculation efforts in sensor signal evaluation.
Innovation Solution
The method involves using a sensor unit with a Hall sensor and a diametrically magnetized magnetic ring to detect angular position, where harmonic errors are identified and corrected using Fourier coefficients, with parameters determined through least squares methods and gradient-based optimization to minimize calculation effort and enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If harmonic error compensation is performed using traditional methods, then measurement precision is improved, but calculation effort and processing time increase
Solution Approach 1:
The patent pre-calculates and stores correction values in lookup tables during system initialization or calibration phase. These pre-computed correction values are then directly retrieved during operation without performing complex real-time calculations, thus achieving high measurement precision while minimizing calculation effort during actual use
Solution Approach 2:
The patent focuses on compensating for the most significant harmonic error components (primarily the dominant harmonics) rather than attempting to correct all possible error sources. By addressing only the most impactful error terms, the system achieves substantial accuracy improvement with limited calculation resources
2Measurement precision
If harmonic error compensation is performed in real-time during operation, then angular position accuracy is improved, but processing time increases
Solution Approach 1:
Correction values are pre-computed and stored in lookup tables before actual operation. During real-time angular position measurement, the system simply retrieves the appropriate correction value from the lookup table based on the measured position, avoiding time-consuming real-time calculations while maintaining high accuracy
Solution Approach 2:
The patent replaces complex real-time computational processes with simple lookup table retrieval operations. This substitution of calculation-intensive operations with fast memory access operations dramatically reduces processing time while preserving the accuracy benefits of harmonic error compensation
3Reliability
If sensor signal evaluation includes harmonic error correction, then reliability of sensor signal is improved, but device complexity increases
Solution Approach 1:
The system performs harmonic error characterization and correction parameter generation during an initial calibration phase or system setup. This preliminary action separates the complex analysis work from the operational phase, making the actual sensor signal evaluation during operation simple and reliable without requiring complex real-time 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 allows for more accurate and rapid determination of angular position with reduced harmonic errors, improving sensor signal reliability and efficiency during operation.
Implementation Method 1
The sensor element can be a Hall sensor
Data Source
AI summary
A first sensor signal and a second sensor signal are provided by a sensor unit to an evaluation unit. The first sensor signal is dependent on the angular position and is associated with a first detection position, and the second sensor signal is associated with a second detection position lying about the rotational axis perpendicular to the first detection position. An angular position of a rotational component is determined by the evaluation unit based on output from an atan2-function that takes the first and second sensor signals as input. A harmonic error is determined by the evaluation unit based on a periodic error signal that is superimposed on each of the sensor signals. An angular error of the angular position is determined by the evaluation unit based on the harmonic error. The angular position is updated by the evaluation unit based on the angular error.