Staggered Conductive Arrays for Precision Position Sensing
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Solution Overview
Problem
Existing sensors face challenges in accurately determining the position of a target object due to issues such as edge effects, stray field impact, and inaccuracy in signal measurement, particularly in safety-critical applications like automobile control systems.
Innovation Solution
A system comprising a target with staggered arrays of conductive features and receiving coil arrays configured to sense magnetic fields associated with these features, along with processing circuitry to generate and process signals for precise position determination, including buffer spaces and phase-shifted loops to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single array of conductive features is used for position sensing, then the device structure is simple, but measurement precision deteriorates due to edge effects and stray field impact
Solution Approach 1:
The target is divided into two separate arrays of conductive features (first array with N features, second array with N+I features) that are staggered relative to each other. Each array is sensed by a dedicated receiving coil array, allowing independent signal generation and processing. This segmentation enables the system to overcome edge effects and stray field limitations that would affect a single array, thereby improving position sensing accuracy without requiring a single overly complex structure.
Solution Approach 2:
The patent introduces a second dimension to the target structure by creating staggered arrays where the second array is offset from the first array along the travel direction of the target. This dimensional arrangement allows the receiving coil arrays to sense magnetic fields from multiple spatial positions simultaneously, providing redundant measurement information that improves precision while distributing the structural complexity across multiple simpler components.
2Measurement precision
If buffer spaces are added to minimize edge effects, then measurement precision improves, but the target length increases
Solution Approach 1:
Instead of adding buffer spaces to a single array, the patent segments the target into two arrays with different numbers of conductive features (N and N+I). The staggered arrangement allows the effective sensing length to be extended through the combination of both arrays without requiring additional buffer spaces beyond what is already present in each individual array. This maintains measurement precision while avoiding excessive target length increase.
Solution Approach 2:
The patent changes the parameter of array configuration from a single uniform array to two staggered arrays with different feature counts. This parameter change allows the system to achieve improved measurement precision through the staggered geometry and differential signal processing, rather than relying on increased buffer space dimensions, thereby avoiding excessive target length.
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 system provides improved accuracy and reduced error in position sensing by minimizing edge effects and stray field impact, resulting in enhanced performance for safety-critical applications.
Implementation Method 1
a first receiving coil array configured to sense a first magnetic field that is associated with the first array of conductive features; and a second receiving coil array configured to sense a second magnetic field that is associated with the second array of conductive features
Data Source
AI summary
A system, comprising a target, a first receiving coil array, and a second receiving coil array. The target includes: (i) a first array of conductive features that are arranged in a line or arc and separated from one another by voids, and (ii) a second array of conductive features that are arranged in a line or arc and separated from one another by voids, the conductive features in the first array being staggered with respect to the conductive features in the second array. The first receiving coil array is configured to sense a first magnetic field that is associated with the first array of conductive features. The second receiving coil array is configured to sense a second magnetic field that is associated with the second array of conductive features.