Steering Shaft Position Sensing With Recessed Conductor Layout
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional position detection devices for moving members, such as those used in automobile parts, require a large installation size due to the arrangement of multiple yokes and magnetic path forming yokes, making them bulky and difficult to integrate into vehicles.
Innovation Solution
A position detection device comprising a conductive detection member with a recessed portion and an exciting coil and detection coil arrangement that induces a varying voltage in the detection coil based on the position of the recessed portion, allowing for compact design and installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple yokes and magnetic path forming yokes are arranged to sandwich the parallel magnetic field forming yoke and projection yoke over the entire movement range, then the position detection can be achieved, but the installation size becomes large
Solution Approach 1:
The patent extracts the essential function of magnetic field modulation by using only a single yoke structure with a through-hole, eliminating the need for multiple yokes and complex magnetic path forming structures. The through-hole in the single yoke serves as the magnetic path, achieving position detection without requiring the bulky arrangement of multiple yokes over the entire movement range.
Solution Approach 2:
The patent transitions from a three-dimensional arrangement of multiple yokes sandwiching the magnetic field forming yoke to a two-dimensional planar structure with a single yoke and through-hole. This dimensional simplification reduces the installation size while maintaining the magnetic field modulation capability for position detection.
2Reliability
If the stroke sensor uses conventional yoke arrangements, then position detection function is achieved, but the device becomes bulky and difficult to integrate into vehicles
Solution Approach 1:
The patent merges the functions of multiple separate yokes and magnetic path forming structures into a single integrated yoke with a through-hole. This consolidation maintains the position detection function while significantly simplifying the device structure and reducing the number of components.
Solution Approach 2:
The patent segments the magnetic path into a simple through-hole structure within the single yoke, separating the magnetic field generation and modulation functions into distinct but simplified elements. This segmentation allows for easier manufacturing and integration while maintaining detection reliability.
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 device is downsized, facilitating easier integration into vehicles and reducing the overall size and weight of the vehicle steering system.
Implementation Method 1
a voltage is induced in the detection coil by a current flowing in the conductive detection member due to a magnetic field generated by the exciting coil
Data Source
AI summary
A position detection device is configured to detect a position of a moving member moving backward and forward in a predetermined moving direction. The position detection device is provided with a conductive detection member attached to the moving member, and an exciting coil and a detection coil that are arranged extending in the moving direction of the moving member and facing the conductive detection member. The conductive detection member includes a recessed portion recessed in a direction away from the exciting coil and the detection coil. A voltage is induced in the detection coil by a current flowing in the conductive detection member due to a magnetic field generated by the exciting coil, and a magnitude of the voltage induced in the detection coil varies with a position of the recessed portion relative to the detection coil. A vehicle steering device is provided with a shaft, a housing, and the position detection device.