Angle Sensor Transfer Function Autocalibration
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Solution Overview
Problem
Conventional angle sensors are calibrated only once during production, which prevents compensation for temperature-dictated or lifetime-dependent drifts in their transfer function, leading to residual errors in sensor signals during operation.
Innovation Solution
A method and device for determining the transfer function of an angle sensor during operation by receiving a sequence of angle output signals while exposed to a rotating magnetic field, allowing for autocalibration of a look-up table without requiring a reference angle signal, enabling continuous recalibration and compensation for non-idealities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If angle sensors are calibrated only once during production, then the calibration process is simple and quick, but temperature-dictated or lifetime-dependent drifts in the transfer function cannot be compensated, leading to residual errors in sensor signals
Solution Approach 1:
The angle sensor performs autocalibration using its own output signals during regular operation. The signal evaluation device extracts transfer function information directly from the sensor's angle output signals without requiring external reference angle signals, enabling the system to self-correct drifts in the transfer function caused by temperature or aging effects
Solution Approach 2:
The system continuously monitors the angle output signals and uses this feedback to determine the transfer function and update the look-up table. This closed-loop approach allows automatic compensation of transfer function drifts by comparing actual sensor outputs with expected values and adjusting calibration parameters accordingly
2Measurement precision
If conventional calibration using reference angle signals is used, then the transfer function can be linearized, but the requirement for reference angle signals prevents continuous recalibration during operation
Solution Approach 1:
The angle sensor uses its own angle output signals as the basis for determining the transfer function, eliminating the need for external reference angle signals. This self-service approach enables continuous recalibration during regular operation at the actual target location, allowing the sensor to adapt to changing environmental conditions and compensate for drifts in the transfer function
Solution Approach 2:
The calibration system transitions from a static, one-time calibration process to a dynamic, continuous recalibration process. The transfer function is determined repeatedly during operation based on incoming angle output signals, allowing the look-up table to be updated continuously and the sensor to adapt to changing conditions throughout its operational life
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
Enables accurate and continuous correction of the angle sensor's transfer function, reducing measurement inaccuracies and adapting to changes over time, thereby improving the reliability and precision of angle measurements.
Implementation Method 1
the angle sensor outputs a signal which permits the actual angle value to be deduced... in which the angle sensor is exposed to a rotating magnetic field
Data Source
AI summary
The concept described herein relates to a device and a method for determining the transfer function of an angle sensor in the course of operation. For this purpose, a sequence of angle output signals of the angle sensor is received during at least one time interval in which the angle sensor is exposed to a rotating magnetic field. Furthermore, the transfer function of the angle sensor is determined on the basis of the sequence of angle output signals. The method can be carried out during regular operation of the angle sensor.