Sensor With Reference Inductance and Parallel Resonant Circuit
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Solution Overview
Problem
Existing sensors have complex structures and are difficult to evaluate, making them challenging to connect and use effectively in applications such as detecting the position of pedals or controllers in automobiles.
Innovation Solution
A sensor design featuring a circuit carrier with measuring inductances and a reference inductance, where the measuring inductances are electrically isolated and arranged along a path, allowing for simple production and measurement of position or force variables, with an electronic control unit connected to form a parallel resonant circuit for easy evaluation and scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex sensor structures are used to achieve accurate position measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensor is divided into independent functional modules: a reference inductance unit and multiple measuring inductance units arranged along a path. Each unit can be independently configured and evaluated, simplifying the overall system while maintaining measurement accuracy through modular architecture
Solution Approach 2:
The reference inductance serves multiple functions: it generates the magnetic field for measurement, provides a reference for comparison, and enables evaluation of multiple measuring inductances simultaneously. This multi-functionality reduces the need for additional components, simplifying the device structure
2Length of stationary object
If multiple measuring inductances are used to extend measuring range, then measuring range is improved, but device complexity increases
Solution Approach 1:
Multiple measuring inductances are combined along a single path and evaluated together through the parallel resonant circuit. The measuring body's position is determined by evaluating the combined effect of all measuring inductances, allowing extended measuring range without proportionally increasing circuit complexity
Solution Approach 2:
The measuring inductances are arranged linearly along a path rather than being distributed in three-dimensional space. This one-dimensional arrangement simplifies the spatial configuration and circuit connections while maintaining an extended measuring range along the path
3Ease of operation
If measuring inductances are electrically connected to reference inductance for evaluation, then ease of evaluation is improved, but reliability decreases due to potential short circuits
Solution Approach 1:
A parallel resonant circuit is introduced as an intermediary evaluation element. The reference inductance and measuring inductances are electrically connected to this resonant circuit, which mediates the evaluation process. This allows electrical connection for easy evaluation while the resonant circuit's inherent properties provide isolation and protection against short circuits
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 sensor achieves a simple and cost-effective structure for measuring position or force variables, enabling high resolution and long measuring ranges without complex wiring, and allows for easy scaling and efficient evaluation of multiple inductances.
Implementation Method 1
The reference inductance can generate a magnetic field which is detected by the measuring inductances and which depends on an external variable and/or on the position or location of a measuring body
Implementation Method 2
the reference inductance can generate a magnetic field which is detected by the measuring inductances
Implementation Method 3
The electronic control unit is configured to excite the parallel resonant circuit to oscillate with an excitation frequency
Data Source
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Figure 2
AI summary
The invention relates to a sensor comprising a circuit carrier, a number of measuring inductors on the circuit carrier, and a reference inductor that is coupled to the measuring inductors.