Clutch Actuator Angle Sensing With Noise-Corrected Hall Signals
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Solution Overview
Problem
Existing methods for detecting the angular position of a rotational component are not sufficiently accurate and fast, often requiring significant computational power and being susceptible to noise.
Innovation Solution
A method that uses a sensor unit with a Hall sensor and a diametrically magnetized magnetic ring to detect the angular position by determining the highest amplitudes of periodic sensor signals, while accounting for noise using a noise detection and correction process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the angular position is detected using a sensor system that picks up magnetic field changes, then the angular position can be measured, but the detection accuracy is insufficient and computational power requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values in a lookup table that compensates for amplitude variations. Instead of performing complex real-time calculations, the system pre-processes the correction data during system initialization or calibration, making the actual angular position calculation during operation simple and fast while maintaining high accuracy.
Solution Approach 2:
The patent changes the parameter approach by introducing a correction parameter based on amplitude information. The system calculates the amplitude of the sensor signal and uses this parameter to select or adjust the appropriate correction value from the lookup table, thereby compensating for measurement errors without requiring complex real-time computation.
2Measurement precision
If the highest amplitude is calculated to improve angular position accuracy, then detection precision improves, but the calculation effort increases
Solution Approach 1:
The patent pre-calculates correction values for different amplitude conditions and stores them in a lookup table. This preliminary action eliminates the need for complex real-time calculations when determining the highest amplitude, as the system can directly retrieve pre-computed correction values based on measured amplitude, thereby maintaining high precision while improving calculation speed.
3Measurement precision
If noise correction is applied to improve measurement accuracy, then angular position precision improves, but the complexity of the detection system increases
Solution Approach 1:
The patent introduces amplitude information as an additional parameter to characterize the sensor signal. By monitoring amplitude variations and using them to select appropriate correction values from a lookup table, the system compensates for noise and measurement errors without requiring complex filtering algorithms or additional hardware components.
Solution Approach 2:
The patent pre-processes noise correction data by creating a lookup table with correction values for different amplitude conditions. This preliminary action simplifies the real-time detection process, as the system only needs to measure the current amplitude and retrieve the corresponding correction value, rather than performing complex noise analysis during operation.
4Productivity
If the angular position is detected faster with reduced computational power, then productivity improves, but measurement precision may deteriorate
Solution Approach 1:
The patent performs preliminary calculation and storage of correction values in a lookup table during system initialization. This allows the runtime detection process to simply retrieve pre-computed values based on measured amplitude, achieving both high detection speed and maintained precision without requiring complex real-time computations.
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 method achieves more accurate and faster detection of the angular position with reduced computational power, effectively minimizing errors caused by noise and amplitude deviations.
Implementation Method 1
A sensor unit and the rotational component can be arranged in a vehicle. The sensor unit can be designed as an angle sensor. 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 the second sensor signal is phase-shifted by 90° with respect to the first sensor signal. A noise value that is superimposed on each sensor signal due to noise in the corresponding sensor signal is determined by the evaluation unit. Each sensor signal is corrected by the evaluation unit based on the noise value determined for the corresponding sensor signal. Highest amplitudes for each of the first and second sensor signals are determined by the evaluation unit as a maximum value of amplitudes of the respective sensor signals detected over multiple revolutions of the rotational element. An angular position of a rotational component is determined by the evaluation unit based on output from an atan 2-function that takes the first and second sensor signals and the highest amplitudes as input.