Magnetic Torque Sensor Compensation for Steering Signal Artifacts
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Solution Overview
Problem
Magnetic torque sensor devices in electromechanical steering systems suffer from signal artifacts such as nonlinearities and asymmetries, leading to inaccurate steering commands and limiting their application possibilities.
Innovation Solution
A computing unit is integrated into the torque sensor device to provide first and second parameters for compensating the uncompensated measurement signal, using a linearization parameter for nonlinear behavior and a symmetrization parameter for asymmetrical behavior, calculated via a formula (T*=T+T2*psymm+T3*plin) to generate a compensated measurement signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic torque sensor device is used for contactless torque measurement, then wear-free operation and maintenance-free characteristics are achieved, but signal artifacts including nonlinearities and asymmetries occur that reduce measurement quality
Solution Approach 1:
The patent applies parameter changes by introducing compensation parameters (linearization parameter and symmetrization parameter) that modify the measurement signal characteristics. The computing unit calculates compensated measurement signals by adjusting parameters such as magnetic flux density values at different angular positions, thereby correcting nonlinearities and asymmetries in the original measurement signal while preserving the wear-free operation benefit
Solution Approach 2:
The patent implements feedback through the computing unit that continuously processes the uncompensated measurement signal and generates a compensated measurement signal. The system uses the detected angular position and torque values to calculate correction factors and apply real-time compensation, creating a closed-loop feedback mechanism that improves measurement precision without affecting the contactless operation
2Measurement precision
If compensation parameters are calculated and applied to correct measurement signals, then measurement precision is improved, but device complexity increases due to additional computing requirements
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing linearization and symmetrization parameters during system initialization or manufacturing. These pre-computed parameters are then applied during normal operation without requiring complex real-time calculations, thereby improving measurement precision while minimizing the computational burden and device complexity
Solution Approach 2:
The patent replaces complex mechanical compensation mechanisms with computational methods. Instead of using additional mechanical sensors or physical compensation devices, the system uses a computing unit to calculate compensated measurement signals through mathematical algorithms, thereby achieving improved precision with minimal increase in device complexity
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 compensation method enhances the precision of steering commands, improves driving experience, and increases driving safety by reducing measurement inaccuracies and expanding the application possibilities of the torque sensor device.
Implementation Method 1
a magnetic ring non-rotatably connected to the input shaft for generating a magnetic field
Data Source
AI summary
An electromechanical steering system includes a steering shaft by which a steering command can be specified by a steering handling device, and a steering gear, which is designed to convert a steering command into a steering movement of steerable wheels of a motor vehicle, taking into account at least one input variable. A magnetic torque sensor device measures a torque applied to the steering shaft. The torque sensor device comprises a sensor for detecting an uncompensated measurement signal (T). The torque sensor device comprises a computing unit, which is designed to provide a first parameter and a second parameter for compensation of the uncompensated measurement signal (T) and to calculate a compensated measurement signal (T*) based on the uncompensated measurement signal (T) and the two parameters and to provide this compensated measurement signal (T) as the at least one input variable.