Inductive Torque Sensor Receiver Structure Integer Ratio
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Solution Overview
Problem
State-of-the-art inductive torque sensors for motor vehicle steering systems experience measurement errors due to the influence of receiver means on each other, affecting the accuracy of steering moment determination, particularly when using the angle difference method.
Innovation Solution
The inductive torque sensor employs receiver structures with an integer ratio of numbers between the first and second receiver means, reducing measuring errors by minimizing fault influences over a full circle and smaller angles, with receiver structures designed as coils having periodically repeated loop structures and rotors matching the angle periodicity of their respective receiver structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If receiver means are arranged on one plane to measure angle positions, then the sensor structure is simplified, but measurement errors increase due to mutual influence between receiver means
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of receiver coils to a three-dimensional configuration where receiver means are distributed in space around the rotors. This spatial distribution eliminates mutual interference while maintaining structural simplicity, resolving the contradiction between device complexity and measurement precision.
2Adaptability or versatility
If non-integer ratio of receiver structures is used, then angle measurement coverage is improved, but calculation errors increase in torque determination
Solution Approach 1:
The patent changes the critical parameter from non-integer ratio to integer ratio between the numbers of receiver structures in different receiver means. This parameter change eliminates calculation errors in torque determination while preserving adequate angle measurement coverage, resolving the contradiction between adaptability and measurement precision.
3Device complexity
If absolute angle position measurement is used to determine torsion, then the measurement method is simplified, but error sources increase due to multiple measurement points
Solution Approach 1:
The patent extracts and eliminates the intermediate step of measuring absolute angle positions at multiple points. Instead, it directly measures the relative angle difference between two rotors using the integer-ratio receiver structure configuration. This extraction removes the error accumulation problem while keeping the measurement method simple, resolving the contradiction between device complexity and 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 enhances measurement accuracy and reduces errors in calculating angle differences, allowing for reliable detection of steering moments with minimal measurement errors, even at smaller angles of rotation.
Implementation Method 1
at least one excitation coil (7), at least one oscillator circuit (8) connected to the excitation coil (7) which generates a periodic alternating voltage signal and couples it into the excitation coil (7) during operation
Implementation Method 2
at least 2 rotors (3, 4) which can be rotated relative to one another and relative to the stator circuit board (2) and which influence the strength of the inductive coupling between the excitation coil (7) and the receiver means (20, 21)
Data Source
AI summary
An inductive torque sensor for a motor vehicle is provided that has an excitation coil, an oscillator circuit which is coupled with the excitation coil and which generates a periodic alternating voltage signal and couples it with the excitation coil during operation, a stator circuit board with first receiver means and second receiver means with each having a number of periodically repeated receiver structures, at least two rotors which can be rotated relative to one another and relative to the stator circuit board and which influence the strength of the inductive coupling between the excitation coil and the receiver means, and evaluation means suitable for evaluation of the signals induced in the receiver means.