Rotational Phase Detection Using Dual Calibration Channels
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Solution Overview
Problem
Magnetic speed sensors face inaccuracies in determining the phase of rotating objects due to vibrations and calibration errors, which can lead to incorrect phase measurements and resource-intensive corrections.
Innovation Solution
A sensor device that processes both fixed-calibrated and self-calibrated channels from multiple sensor elements to account for offsets and vibrations, providing phase measurement information that is robust against vibrations and accurate in determining the phase of rotating objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic speed sensors are used to determine rotational phase, then rotational speed and direction can be measured, but phase measurement accuracy deteriorates due to vibrations and calibration errors
Solution Approach 1:
The patent divides the measurement system into multiple sensor elements (at least two) that generate separate measurement signals. Each sensor element independently measures the magnetic field, and their signals are processed separately through fixed-calibrated and self-calibrated channels. This segmentation allows the system to compare and reconcile multiple measurement paths, thereby improving phase measurement accuracy while compensating for vibrations and calibration errors that would affect any single sensor element.
2Measurement precision
If calibration corrections are applied to account for offsets and vibrations, then phase measurement accuracy improves, but system complexity and computational resources increase
Solution Approach 1:
The patent implements preliminary calibration by generating both fixed-calibrated channels (with predetermined calibration parameters) and self-calibrated channels (that automatically adapt to current conditions) before actual phase measurement. The system pre-computes calibration offsets and stores them for later use, so that during operation, the correction process is simplified to applying pre-determined values rather than performing complex real-time calculations. This reduces computational complexity while maintaining high measurement accuracy.
3Reliability
If multiple calibrated channels are generated from sensor signals, then vibration compensation and offset correction improve, but processing time and computational resources increase
Solution Approach 1:
The patent merges the functionality of multiple calibration approaches by combining fixed-calibrated channels and self-calibrated channels into a unified processing framework. Instead of separately executing independent calibration routines, the system integrates both calibration methods into concurrent signal processing paths that share common computational resources. The fixed-calibrated and self-calibrated channels are processed simultaneously using shared hardware and algorithms, reducing redundant computations and minimizing processing time while maintaining the benefits of both calibration approaches for vibration compensation and offset correction.
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 increases the accuracy of phase detection for rotating objects, prevents errors, and conserves resources by effectively accounting for vibrations and offsets in real-time, ensuring reliable phase measurement even during startup.
Implementation Method 1
a first sensor element configured to sense a magnetic field associated with a magnet and rotatable object
Data Source
AI summary
Some examples described herein may include receiving, by a sensor device, differential measurement signals from at least two sensor elements; generating, by the sensor device, fixed-calibrated channels from the differential measurement signals, generating, by the sensor device, self-calibrated channels from the differential measurement signals; determining, by the sensor device, offsets associated with the differential measurement signals based on the self-calibrated channels; determining, by the sensor device, whether a vibration occurred within the differential measurement signals based on the fixed-calibrated channels; and providing, by the sensor device, phase measurement information based on the offsets and whether the vibration occurred, wherein the phase measurement information identifies a phase of the rotatable object.