Piezoelectric Door Handle Sensor for Gloved Detection
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Solution Overview
Problem
Conventional capacitive sensors for vehicle door control face detection issues when users wear gloves or when the detection area is wet due to rain or frost, leading to unreliable door unlocking and locking.
Innovation Solution
A device with a detection wall featuring a piezoelectric material layer with surface undulations, allowing for reliable contact detection and identification of complex movements, orientations, and durations, regardless of weather conditions or glove wear, integrated into a motor vehicle door handle or post, accompanied by a lighting element for visual signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capacitive sensors are used for door control, then remote user identification is enabled, but detection reliability deteriorates when users wear gloves or when the detection area is wet
Solution Approach 1:
The patent replaces capacitive sensing (electrical field-based) with piezoelectric sensing (mechanical stress-based). The piezoelectric layer detects mechanical stress from finger contact through surface undulations, eliminating sensitivity to weather conditions and glove materials that interfere with capacitive sensing.
Solution Approach 2:
The detection surface features undulations with ridges and valleys that concentrate mechanical stress at specific contact points. This curved surface geometry enhances the piezoelectric effect by focusing finger pressure onto the piezoelectric material, improving detection reliability regardless of glove texture or surface moisture.
2Adaptability or versatility
If the detection area is extended to accommodate additional interface elements, then user interaction capability is improved, but the complexity of the device increases
Solution Approach 1:
The detection wall serves multiple functions: it provides the structural mounting surface for the piezoelectric sensor, creates the detection area through its geometry, and offers mounting support for additional interface elements like screens or lighting. This multi-functional design enhances user interaction without proportionally increasing complexity.
Solution Approach 2:
The patent combines the detection surface with the handle structure, integrating the piezoelectric sensor mounting, detection area, and additional interface elements into a single unified detection wall assembly. This merging reduces overall device complexity while maintaining enhanced user interaction capabilities.
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
Enables reliable locking and unlocking of vehicle doors under various weather conditions and with gloved hands, enhancing user interaction through improved detection sensitivity and visual feedback.
Implementation Method 1
a sensor with a layer of a piezoelectric material having surface undulations in the form of ridges, said layer of piezoelectric material being configured to detect a predetermined contact
Data Source
AI summary
A device and a method for locking and/or unlocking a motor vehicle opening panel and vehicle having the device. The device includes a detection wall having an inner side and an opposite outer side, the outer side forming a contact detection region, and a detection component arranged against the inner side for detecting contact between a user's finger or hand and the outer side. The detection component includes a sensor having a layer of a piezoelectric material which has surface undulations in the form of ridges. The layer of piezoelectric material is configured to detect predetermined contact on the outer side with a view to controlling the locking or unlocking of the opening panel.