Torque Sensor Device With Interference Compensation
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Solution Overview
Problem
Magnetic interference fields from nearby electrical machines can inaccurately determine torque values in existing torque sensor devices for motor vehicle steering shafts by altering the magnetic flux density detected by the sensors.
Innovation Solution
Incorporating an additional receiving device with magnetic sensors to detect and partially compensate for magnetic interference fields, along with a control device to calculate and adjust for the interference's influence on the signal, and using flux conductors to enhance magnetic flux detection and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic sensors are used to detect torque through magnetic flux density changes, then torque detection capability is achieved, but magnetic interference fields from nearby electrical machines cause false signals and reduce measurement accuracy
Solution Approach 1:
A control device acts as an intermediary between the magnetic sensors and the torque calculation process. It receives signals from both the first magnetic sensor (detecting torque-related flux changes) and the second magnetic sensor (detecting interference field flux changes), processes these signals to separate the interference component, and outputs a corrected torque signal. This mediator approach allows the system to maintain torque detection capability while eliminating the harmful influence of magnetic interference fields.
Solution Approach 2:
The control device implements a feedback mechanism by continuously monitoring the output of both magnetic sensors and using the interference detection signal to adjust and compensate the torque measurement signal. The control device processes the interference field detection in real-time and applies compensation to the torque measurement, creating a closed-loop system that actively counteracts the harmful effects of magnetic interference and maintains accurate torque measurement despite the presence of electrical machines in the vicinity.
2Measurement precision
If additional magnetic sensors and control devices are added to compensate for magnetic interference, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The control device is designed with multi-functionality, serving both as an interference detector and a torque calculator. Instead of having separate dedicated components for interference detection and torque measurement processing, the control device performs both functions by processing signals from multiple magnetic sensors. This universal approach achieves improved measurement accuracy through interference compensation while avoiding the additional complexity that would result from completely separate interference detection and torque measurement systems.
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 significantly reduces the impact of magnetic interference on torque measurements, improving accuracy and reliability of torque detection in torque sensor devices.
Implementation Method 1
The magnetic flux of the ring magnet can be conducted via the stator, which typically consists of two separate stator parts, each with an annular disk-shaped area, to a magnetic sensor, such as a Hall sensor, and evaluated.
Implementation Method 2
at least one additional receiver with at least one additional magnetic sensor, wherein the additional receiver is configured to at least partially detect a magnetic interference field acting on the torque sensor device and present in the vicinity of the torque sensor device
Implementation Method 3
a control device to compensate for the influence of the magnetic interference field on the signal detected by the first receiving device, at least depending on the magnetic interference field detected at least partially by means of the additional receiving device
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a torque sensor device (10) for detecting a torque applied to a shaft, in particular for detecting a torque applied to a steering shaft of a motor vehicle, and to a motor vehicle with such a torque sensor device (10), wherein the torque sensor device (10) comprises a transmitter (12) with a transmitter element (12) and a first receiver (15) with at least one first magnetic sensor (15A, 15B), wherein the first receiver (15) is configured to receive a signal emitted by the transmitter (12) and transmitted along a signal path to the first receiver (15), and wherein the torque applied to the shaft can be determined from the signal received by the first receiver (15).The torque sensor device (10) further comprises at least one additional receiving device (16) with at least one additional magnetic sensor (16A), wherein the additional receiving device (16) is designed at least partially for detecting a magnetic interference field acting on the torque sensor device (10) and present in the vicinity of the torque sensor device (10).