Steering Shaft Magnetic Sensing for Vibration-Resistant Angle Measurement
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Solution Overview
Problem
Conventional vehicle steering apparatuses face challenges in accurately measuring steering angle due to inaccuracies in axial displacement measurement of the sliding shaft, which are exacerbated by shock and vibration from the road surface, leading to decreased precision.
Innovation Solution
A steering apparatus design featuring a sliding shaft within a shaft housing, a shaft coupling member, a magnet coupling member with a built-in magnet, and a sensor member to detect magnetic field changes, ensuring accurate axial displacement measurement and maintaining precision despite road surface shocks and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnet and sensor are mounted in a conventional structure to measure axial displacement of the sliding shaft, then the steering angle measurement can be performed, but the measurement precision deteriorates due to mounting structure inaccuracies and shock/vibration from road surface
Solution Approach 1:
The measurement system is divided into separate functional components: the magnet is integrated into the magnet coupling member which is coupled to the sliding shaft, while the sensor is mounted on the sensor support member which is fixed to the housing. This segmentation isolates the measurement components from each other's interference and from the mounting structure inaccuracies, maintaining measurement precision under shock and vibration conditions
Solution Approach 2:
The magnet coupling member and sensor support member act as intermediary elements between the sliding shaft and the sensor. The magnet coupling member transfers the axial displacement of the sliding shaft to the magnet, while the sensor support member provides a stable mounting platform for the sensor. These intermediaries isolate the measurement system from direct mechanical interference and mounting inaccuracies
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 enhances durability and precision of steering angle measurement by accurately tracking axial displacement, maintaining measurement accuracy even under conditions of shock and vibration.
Implementation Method 1
a sensor member (150) coupled to the sliding support member (140), and a sensor (153) for detecting a magnetic field change of the magnet (132) mounted on a circuit board (151)
Data Source
AI summary
The present embodiments provide a steering apparatus including a sliding shaft that is built into a shaft housing and linearly moves in the axial direction, a shaft coupling member coupled to an outer circumferential surface of the sliding shaft and axially sliding together with the sliding shaft inside the shaft housing, a magnet coupling member having a built-in magnet inside, coupled to the shaft coupling member, and axially sliding together with the sliding shaft inside the shaft housing, a sliding support member fixed to the shaft housing and slidably coupled to the magnet coupling member at a lower end thereof, and a sensor member coupled to the sliding support member and to which a sensor for detecting a magnetic field change of the magnet and a circuit board are mounted.