Magnetoelastic Load Sensor Environmental Compensation
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Solution Overview
Problem
Load measurement devices face challenges in accurately measuring loads in test objects, particularly in vehicles, due to changing operating conditions such as varying magnetic fields and temperatures, which can lead to measurement errors.
Innovation Solution
A load measurement method and device that utilize a sensor head with a magnetic field generating device, magnetic field detecting devices, and an evaluation device to generate a measurement signal based on acquired measurement environment parameters, such as temperature, magnetic fields, and acceleration, to correct for environmental influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetoelastic sensors are used to measure loads in test objects, then load measurement capability is provided, but measurement precision deteriorates due to changing operating conditions such as varying magnetic fields and temperatures
Solution Approach 1:
The patent implements feedback by continuously monitoring environmental parameters (temperature, magnetic field strength) and using this information to compensate for their effects on the magnetoelastic sensor readings. The evaluation device adjusts the measurement signals based on feedback from environment sensors, thereby maintaining measurement precision despite changing operating conditions.
Solution Approach 2:
The patent changes physical parameters by introducing additional sensors that detect environmental parameters (temperature, magnetic field) and using these parameter changes to compensate for their impact on the primary load measurement. This allows the system to adapt to varying operating conditions and maintain accurate measurements.
2Measurement precision
If active magnetization with alternating magnetic field is used to improve measurement, then measurement capability is enhanced, but device complexity increases due to additional coils and signal processing requirements
Solution Approach 1:
The patent applies multi-functionality by designing the sensor head to perform multiple functions: the magnetic field generating coil serves both to actively magnetize the test object for improved measurement and to detect ambient magnetic fields for compensation. The evaluation device handles multiple tasks including signal processing, environmental parameter acquisition, and compensation calculations, reducing the need for separate dedicated components.
3Adaptability or versatility
If multiple sensor heads are used to measure loads in different positions, then measurement coverage is improved, but device complexity and cost increase
Solution Approach 1:
The patent segments the measurement system into multiple independent sensor heads that can be distributed at different positions around the test object. Each sensor head is a self-contained unit with the same basic components, allowing modular expansion. This segmentation enables flexible deployment to cover different measurement locations without requiring a completely different system design for each position.
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
The solution significantly reduces measurement errors caused by changing operating conditions, providing more reliable load measurement results even in dynamic and varying environments.
Implementation Method 1
a magnetic field generating device for generating a magnetic field in the test object, the magnetic field generating device comprising a magnetic field generating coil arranged on the sensor head and a power source to supply the magnetic field generating coil with a periodically alternating current
Implementation Method 2
a first magnetic field detecting device arranged on the sensor head for detecting a first magnetic field parameter which changes on the basis of a load in the test object
Implementation Method 3
load measurement device... for detecting changes in the magnetic field... based on the Villari effect and even more particularly for magnetoelastic (=inverse magnetorestrictive) detection of loads
Data Source
AI summary
The invention relates to a load measurement device (12) for accurately measuring a load in a test object (14) such as, in particular, a chassis component, comprising a magnetic field generating device (18), a first magnetic field detecting device (20), a second magnetic field detecting device (22), and a measurement environment parameter acquisition device (80) for acquiring at least one measurement environment parameter in the test object (14), wherein an evaluation device (42) is configured to generate a measurement signal obtained on the basis of outputs of the first and second magnetic field detection devices (20, 22) in dependence on the at least one measurement environment parameter detected by the measurement environment parameter acquisition device (80).