Roll Stabilizer Torque Sensor Using Inverse Magnetostriction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing roll stabilizers for motor vehicles face challenges in accurately detecting torque between stabilizer sections due to external influences like mechanical and thermal factors, which affect the functionality of magnetic coding-based sensor devices.
Innovation Solution
A roll stabilizer with a sensor device using inverse magnetostriction principles, where a transmitter coil magnetizes a measuring body, and a receiver coil detects the magnetic field changes, allowing for non-contact, wear-free torque detection without permanent magnetization, thus reducing susceptibility to external influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic code is incorporated into the stabilizer section for torque detection, then the sensor device can detect torque, but the magnetic coding strength is subject to external influences (mechanical impacts, vibration, thermal influences) which restricts the functionality of the sensor device
Solution Approach 1:
The patent replaces the mechanical magnetic coding system with an electromagnetic field-based measurement system. Instead of relying on permanent magnetic codes in the stabilizer section, the invention uses a transmitter coil to generate a magnetic field that is modulated by the torsional stress on the measuring element, detected by receiver coils. This substitution eliminates the need for permanent magnetization and reduces susceptibility to external mechanical and thermal influences.
Solution Approach 2:
The patent introduces a transmitter coil as an intermediary element that magnetizes the measuring element temporarily during operation. This intermediary approach allows the magnetic field to be generated on-demand rather than relying on permanent magnetization, enabling precise torque detection while minimizing the impact of external influences on the sensor device's functionality.
2Measurement precision
If permanent magnetization is applied to the measuring zone for torque detection, then the magnetic field can be detected by the sensor, but the magnetization is subject to external influences during operation
Solution Approach 1:
The patent employs periodic action by using a transmitter coil to temporarily magnetize the measuring element only during the measurement process. The magnetic field is generated on-demand in periodic cycles rather than maintaining permanent magnetization, which reduces the accumulation of harmful effects from external influences while still enabling accurate magnetic field detection for torque measurement.
3Device complexity
If the sensor device is arranged on the ring gear of the planetary gear set, then the structure is compact, but this arrangement is disadvantageous for the roll stabilizer
Solution Approach 1:
The patent extracts the sensor device from the planetary gear set's ring gear arrangement and relocates it to a position where it can measure torque directly on the measuring element subjected to torsional stress. This extraction allows the sensor device to be optimally positioned for accurate torque detection while maintaining structural efficiency, eliminating the disadvantages of the ring gear arrangement.
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 solution enables accurate and durable torque detection, improving the stability and adjustability of the roll stabilizer by minimizing the impact of external factors on the sensor device, enhancing vehicle stability and driving comfort.
Implementation Method 1
the actuator housing is magnetizable by means of the transmitter coil and the magnetic field generated by the actuator housing can be detected
Implementation Method 2
sensor device operating on the principle of inverse magnetostriction for detecting a torque acting between stabilizer sections
Implementation Method 3
at least one receiver coil for detecting the magnetic field of the measuring element
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed is a roll stabilizer (1) for a motor vehicle, comprising a sensor unit (10), which operates according to the principle of inverse magnetostriction, for acquiring torque (M) acting between stabilizer portions (6a, 6b), characterized in that the sensor unit (10) includes a transmitter coil (12) for magnetizing a measurement element (4; 6a) affected by torsional stress during operation, and at least one receiver coil (13) for acquiring the magnetic field of the measurement element (4; 6a). Also disclosed is a sensor unit (10) for a roll stabilizer (1) of the aforementioned type.