Torque Detection Unit with Dual Sensor Orientation
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Solution Overview
Problem
Existing torque detection units in vehicle engineering face challenges in accurately measuring torque on shafts due to measurement errors caused by thermal and mechanical perturbations such as temperature drift, vibrations, and deformations, which are often undetected and lead to misinterpretations.
Innovation Solution
A torque detection unit is designed with a magnetic field excitation unit and two sensor units oriented differently to detect changes in the magnetic field on a shaft, allowing for the separation of torque-related signal components from perturbation-related components, effectively eliminating external interference and enhancing measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensor unit is used to detect torque, then the device complexity is reduced, but measurement precision deteriorates due to undetected perturbations
Solution Approach 1:
The patent applies local quality by orienting sensor units in different directions (e.g., radial vs. tangential orientation) to detect different components of the magnetic field. This allows the system to distinguish between torque-induced field changes and perturbation-induced field changes by analyzing the directional dependence of the sensor responses, thereby improving measurement precision without requiring excessive numbers of sensor units.
2Measurement precision
If multiple sensor units with different orientations are used, then measurement precision improves by separating torque signals from perturbations, but device complexity increases
Solution Approach 1:
The patent employs asymmetry by using sensor units with non-identical orientations (e.g., one radially oriented and one tangentially oriented relative to the shaft). This asymmetric arrangement creates different sensitivity patterns for each sensor unit, enabling the system to mathematically separate the torque signal from perturbation signals through differential evaluation, thus achieving high measurement precision with a manageable number of sensor units.
3Measurement precision
If active magnetic field excitation is applied to the shaft, then torque detection capability is enhanced, but the shaft requires special material provisions
Solution Approach 1:
The patent introduces an intermediary approach by applying an external active magnetic field excitation to the shaft rather than relying on the shaft's own material properties. The magnetic field excitation unit generates a controlled magnetic field that interacts with the shaft, and sensor units detect the resulting field changes. This intermediary method enhances torque detection capability without requiring the shaft to have special piezoelectric or magnetostrictive material properties, thereby maintaining ease of manufacture.
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 approach enables reliable and accurate torque measurement on shafts by isolating torque-induced signals from orientation-independent perturbations, improving the precision and reproducibility of torque detection.
Implementation Method 1
an excitation unit, which is configured to apply a magnetic field which changes over time to the shaft
Implementation Method 2
a first sensor unit and a second sensor unit, which are configured to detect a magnetic field carried by the shaft
Implementation Method 3
the first and the second sensor units, in particular with an otherwise identical design, having different orientations with respect to one another so that they, during operation, are oriented differently from one another with respect to the shaft
Data Source
AI summary
A torque detection unit for actively detecting a torque acting on a shaft, and in particular on a crankshaft, of a vehicle drivable by muscle power and/or by motor power along a rotational axis, including an excitation unit, which is configured to apply a magnetic field which changes over time to the shaft, and a first sensor unit and a second sensor unit, which are configured to detect a magnetic field carried by the shaft, the first and the second sensor unit, in particular with an otherwise identical setup, having different orientations with respect to one another so that they, during operation, are oriented differently from one another with respect to the shaft, and in particular with respect to the rotational axis.