Shift Knob Hall Sensor Layout for More Accurate Position Detection
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Solution Overview
Problem
Existing shift devices have limitations in detection accuracy for shift positions due to the placement of Hall effect elements relative to permanent magnets, which affects the precision of position detection.
Innovation Solution
The shift device incorporates a detection mechanism with a placement portion disposed on the outer side of the rotation radial direction of the rotating portion, allowing for enhanced relative position changes and improved detection accuracy by integrating the rotating portion with the shift body and utilizing Hall ICs on a perpendicular placement component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the Hall effect element is disposed on the inner side in the rotation radial direction of the permanent magnet, then the device structure is compact, but the detection accuracy of shift position is reduced
Solution Approach 1:
The patent moves the detection element from the inner side to the outer side in the rotation radial direction, utilizing the outer radial dimension to achieve larger relative position changes during rotation. This dimensional change enables improved detection accuracy without increasing overall device complexity, as the placement portion is strategically positioned at the outer side where rotational displacement is maximized.
2Device complexity
If the rotating portion and shift body are integrated, then the structure is simplified, but the detection mechanism becomes more challenging to implement
Solution Approach 1:
The rotating portion is integrated with the shift body into a single unified structure. This merging simplifies the overall device by eliminating separate rotating components and reducing assembly steps. The detection mechanism is simultaneously simplified by detecting the position of this integrated structure rather than multiple separate parts.
3Measurement precision
If the placement portion is disposed at the outer side in the rotation radial direction, then the detection accuracy is improved, but the device size increases
Solution Approach 1:
The detection element is positioned at the outer side in the rotation radial direction, utilizing the specific local region where rotational displacement is greatest. This localized placement optimizes detection accuracy by concentrating the detection function at the point of maximum relative position change, rather than distributing detection elements throughout the entire device volume.
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
This configuration enhances detection accuracy for shift positions by enlarging relative position changes between the rotating and placement portions, simplifies the structure, and allows for easier installation of additional mechanisms, thereby improving the overall precision and reducing costs and size.
Implementation Method 1
a shift position of the operating element is detected by detecting a relative rotation position between the permanent magnet and a Hall effect element
Data Source
AI summary
In a shift device, a shift position of a knob is altered as a result of a knob being rotated. Furthermore, a Hall IC on a wiring substrate detects a rotation position of a magnet in the knob, thereby enabling the shift position of the knob to be detected. Here, the Hall IC is placed on an outer side in a rotation radial direction of the magnet. Because of this, it is possible to enlarge the change in the relative position between the magnet and the Hall IC that is generated by the rotation of the magnet, thereby enabling the detection accuracy when detecting the shift position of the knob to be improved.