Rotation Angle Sensor Error Compensation via Inertial Fusion
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Solution Overview
Problem
Existing rotation angle measuring devices are costly due to the need for precise manufacturing and suffer from measurement inaccuracies over time, especially when installed off-axis, requiring complex and expensive compensation methods.
Innovation Solution
A rotation angle measuring device combining a magnetic or inductive measuring standard with a magnetic field measuring unit, an inertial measuring unit, and an evaluation unit on a sensor chip, where the magnetic field measuring unit consists of multiple sensors arranged at specific angles and the inertial measuring unit includes yaw rate or acceleration sensors, allowing data combination for enhanced accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If precise manufacturing is used to improve measurement accuracy, then measurement precision improves, but manufacturing cost increases
Solution Approach 1:
The patent combines magnetic field sensors and inertial sensors (acceleration sensors and/or yaw rate sensors) into a single sensor chip assembly. This integration allows the system to compensate for measurement errors through data fusion, achieving high measurement precision without requiring extremely precise individual sensor manufacturing. The magnetic field measuring unit and inertial measuring unit work together to cancel out errors from axis offsets and manufacturing tolerances.
2Ease of operation
If off-axis installation is used to simplify mounting, then ease of installation improves, but measurement reliability deteriorates over time
Solution Approach 1:
The patent implements a feedback mechanism where the inertial sensors continuously monitor for axis offset errors and measurement deviations. The evaluation unit processes data from both magnetic field sensors and inertial sensors, detecting when axis offset causes measurement errors. The system then compensates for these errors in real-time, maintaining measurement reliability even during off-axis installation. This feedback loop prevents the gradual deterioration of measurement stability that would otherwise occur.
3Reliability
If complex error compensation methods are used to improve measurement reliability, then measurement reliability improves, but device complexity increases
Solution Approach 1:
The patent merges error compensation functionality directly into the sensor chip by integrating both magnetic field sensors and inertial sensors in close proximity. This physical integration allows the evaluation unit to access and process data from both sensor types through a unified data fusion algorithm. The compensation mechanism becomes part of the sensor system itself rather than a separate complex external system, reducing overall device complexity while maintaining high measurement reliability.
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 configuration provides accurate and cost-effective rotation angle measurement with reduced errors, enabling precise detection of small changes in rotation angles and compensating for individual measurement inaccuracies, while maintaining a compact structure.
Implementation Method 1
a magnetic field measuring unit for detecting the characteristic magnetic field of the magnetic or inductive measuring standard during its rotation
Implementation Method 2
an inertial measuring unit for detecting a linear and/or rotational acceleration about at least one axis of the rotation angle measuring device
Data Source
AI summary
To enable a rotary angle measuring device with greater measurement accuracy at moderate cost, a rotary angle measuring device for detecting a rotation angle between two objects rotating relative to each other is provided, comprising a magnetic or inductive measuring body with a characteristic magnetic field, a magnetic field measuring unit for detecting the characteristic magnetic field of the magnetic or inductive measuring body during its rotation, an inertial measuring unit for detecting a linear and/or rotary acceleration about at least one axis of the rotary angle measuring device, and an evaluation unit for combining detected data from the magnetic field measuring unit and the inertial measuring unit and for determining the rotation angle from the combination of the data.