Steering Wheel Capacitive Contact Layout for Dead Area Coverage
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Solution Overview
Problem
Existing vehicle steering wheel detection devices suffer from dead areas due to geometric bending or manufacturing cuts in the detection electrode, leading to incomplete detection of contact or proximity between the user and the steering wheel.
Innovation Solution
The integration of conductive strips that extend the detection area by covering the detection electrode's active surface and bridging dead areas, allowing for capacitive, resistive, or antenna effects to detect user contact even in initially undetectable regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detection electrode is continuously manufactured without cuts, then the detection area is maximized, but geometric bending or manufacturing constraints create dead areas where contact or proximity cannot be detected
Solution Approach 1:
The detection electrode is divided into multiple separate segments rather than being a continuous structure. These segments are arranged to cover the steering wheel rim while allowing for necessary cuts and interruptions, eliminating dead areas where detection would otherwise fail.
Solution Approach 2:
Multiple detection electrode segments are nested or overlapped in specific patterns, with each segment contributing to coverage of different portions of the rim. This nesting arrangement ensures complete coverage without requiring a continuous electrode structure.
2Adaptability or versatility
If the detection electrode is cut or interrupted to accommodate steering wheel geometry, then manufacturing flexibility is improved, but dead areas are created where contact or proximity detection fails
Solution Approach 1:
The detection electrode is segmented into multiple pieces that can be independently positioned and shaped to conform to the steering wheel's geometric requirements, allowing adaptation to various designs without creating detection dead zones.
Solution Approach 2:
The detection electrode segments are arranged in a multi-dimensional configuration around the steering wheel rim, utilizing radial and angular positioning to ensure complete coverage despite cuts and interruptions in the continuous structure.
3Reliability
If a continuous detection electrode is used, then detection coverage is maximized, but manufacturing complexity increases due to geometric bending requirements
Solution Approach 1:
By segmenting the detection electrode into multiple manageable pieces, the manufacturing process is simplified. Each segment can be manufactured and positioned separately, reducing the complexity of geometric bending and assembly compared to a single continuous electrode.
Solution Approach 2:
The detection electrode segments are pre-manufactured and prepared in advance as discrete components, allowing for easier handling, quality control, and assembly during the steering wheel manufacturing process, thereby reducing overall manufacturing complexity.
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 solution significantly reduces dead areas, enhancing the detection accuracy and adaptability to various steering wheel geometries by extending the detection area to include previously undetectable zones, ensuring comprehensive user interaction detection.
Implementation Method 1
a capacitive device for detecting contact or proximity between a user's member and the gripping portion, comprising at least one detection electrode arranged under an outer surface of the gripping portion
Implementation Method 2
the detection device comprises at least one conductive strip attached on the detection electrode, comprising at least one covering portion arranged opposite the detection area and at least one extension portion arranged opposite the dead area
Data Source
AI summary
A vehicle steering wheel having a gripping portion to be grasped by a user, a capacitive device for detecting a contact between a member of the user and the gripping portion, comprising at least one detection electrode arranged under an outer surface of the gripping portion, wherein the detection electrode defines, on the outer surface, a detection area, and a dead area complementary to the detection area, wherein the detection device has at least one conductive strip attached on the detection electrode having at least one covering portion arranged opposite the detection area and at least one extension portion arranged opposite the dead area.