Vehicle Control Panel Recess Layout for False Press Filtering
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Solution Overview
Problem
Existing vehicle control panels struggle to reliably distinguish between intentional presses on control areas and accidental presses outside these areas, leading to potential misactivation of vehicle devices.
Innovation Solution
The control panel incorporates a mechanical weakening in the form of a recess around the detection area, combined with a high-stiffness connection between the support element and printed circuit boards, to reduce parasitic force detection by at least 30% compared to control forces, thereby enhancing the distinction between intended and unintended presses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection area extends close to the force sensors to improve detection sensitivity, then the ability to detect intentional presses is improved, but the likelihood of detecting parasitic forces from accidental presses outside the control area increases
Solution Approach 1:
The support element is designed with non-uniform thickness: a first thickness in the detection area (providing high sensitivity) and a second, greater thickness outside the detection area (reducing parasitic force transmission). This local variation in mechanical properties allows the system to simultaneously achieve high detection sensitivity within control areas while filtering out accidental presses from surrounding areas.
2Measurement precision
If the control area is made small to improve precision of control, then the distinction between control areas is improved, but the detection reliability decreases due to difficulty in distinguishing presses at the boundary
Solution Approach 1:
The support element is segmented into distinct zones with different thicknesses: a thinner detection area corresponding to control areas and a thicker peripheral area. This segmentation creates a mechanical boundary that naturally distinguishes between intentional presses within control areas and accidental presses in surrounding areas, eliminating the need for complex boundary detection algorithms.
3Measurement precision
If the support element is made uniformly thin to improve force sensor sensitivity, then the detection sensitivity is improved, but the structural strength and ability to filter parasitic forces deteriorates
Solution Approach 1:
The support element features localized thickness variation: thin regions under control areas for high sensitivity and thick regions in peripheral areas for structural strength and parasitic force filtering. This local quality differentiation allows each region to perform its optimal function without compromising the other.
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 effectively differentiates between intentional and accidental presses, reducing the likelihood of misactivation by creating a clear 'grey area' around control areas, ensuring accurate detection and reliable operation of vehicle devices.
Implementation Method 1
An example of a force sensor consists of a strain gauge sensor in which a variation in elongation causes a variation in the electrical resistance of the strain gauge, the variation in the electrical resistance of the strain gauge therefore being a function of the deformation; and as the deformation of the strain gauge is a function of the applied force
Data Source
AI summary
A control panel having: a trim element having a first outer face and a first inner face; a support element having a second outer face oriented towards the first inner face of the trim element and a second inner face opposite to said second outer face; and a group of force sensors configured for detecting a control force applied to the first outer face within a control area. The support element has, within a detection area extending around the group of control areas, a mechanical weakening formed by a recess in the second inner face.