Steering Device Three-Layer Grip Detection
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Solution Overview
Problem
Existing steering devices face challenges in maintaining flexibility and accurately detecting gripping conditions while minimizing the impact of coating film deterioration.
Innovation Solution
A steering device design featuring a core metal part covered by a three-layer structure, where the innermost layer is conductive, the middle layer is non-conductive and flexible, and the outer layer is non-conductive, with a capacitance detector to sense gripping conditions, and a control unit to determine gripping conditions based on capacitance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the elastic body layer is subjected to plating to provide conductivity, then the gripping condition detection is enabled, but the flexibility of the elastic body layer is reduced
Solution Approach 1:
The covering part is divided into three distinct layers: a conductive first layer for detection, a flexible non-conductive second layer for comfort, and a protective third layer. This segmentation allows each layer to perform its specific function without compromising the others, resolving the contradiction between conductivity and flexibility.
Solution Approach 2:
The non-conductive second layer acts as an intermediary between the conductive first layer and the outer third layer. This intermediary layer protects the conductive material from direct exposure while maintaining the flexibility needed for grip detection, eliminating the need for plating that would reduce flexibility.
2Shape
If the coating film is exposed to air for aesthetic purposes, then the appearance quality is improved, but the coating film deteriorates over time
Solution Approach 1:
The third layer serves as a protective shell that covers and protects the underlying conductive and flexible layers from air exposure and deterioration. This thin film structure maintains the aesthetic appearance while preventing the degradation that would occur with direct air exposure.
Solution Approach 2:
The non-conductive third layer acts as a protective intermediary between the internal conductive layers and the external environment. This intermediary barrier prevents air from directly contacting and deteriorating the coating film, while still allowing the steering wheel to maintain its aesthetic appearance.
3Measurement precision
If the conductive material is positioned close to the driver's hand in the coat layer, then the grip detection sensitivity is improved, but the manufacturing complexity increases
Solution Approach 1:
The detection function is separated into a dedicated first layer that is specifically designed for conductivity and sensor functionality. This segmentation allows the conductive material to be positioned optimally for detection sensitivity without requiring complex integration into the coat layer structure.
Solution Approach 2:
The first conductive layer serves multiple functions: it provides the necessary conductivity for grip detection, acts as an electrode for the capacitance sensor, and forms part of the overall covering structure. This multi-functionality reduces manufacturing complexity compared to integrating conductive materials throughout the coat layer.
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
Ensures flexibility and accurate detection of gripping conditions without being affected by coating film deterioration, reducing manufacturing complexity and potential defects.
Implementation Method 1
a detector configured to detect a change in capacitance generated between the occupant gripping the gripping part and the first layer
Data Source
AI summary
The steering device includes a rotation part, and a gripping part for being gripped by an occupant; the gripping part includes a core metal part, and a covering part covering the core metal part and including a first layer, a second layer, and a third layer; the first layer is positioned closer to the core metal part, compared to the second and third layers, and has conductivity; the second layer is arranged between the first and third layers, and is formed of a flexible non-conductive material; the third layer is exposed to outside, and is formed of a non-conductive material; and the steering device further includes a detector for detecting a change in capacitance generated between the occupant gripping the gripping part and the first layer, and a control unit for determining gripping condition of the gripping part based on the change in capacitance detected by the detector.