Piezoelectric Vehicle Switching Device for Invisible Door Actuation
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Solution Overview
Problem
Existing motor vehicle switching devices on the exterior compromise the visual appearance and require protection from dirt and moisture, as they are typically visible and have moving parts.
Innovation Solution
Integration of a piezoelectric converter behind a touch surface on the vehicle's window pane or body shell, allowing actuation through slight deformation without visible components, using piezoceramic or polymer materials like PVDF, eliminating the need for external door handles and conventional switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a conventional door handle or visible switching device is used, then the door can be opened, but the visual appearance of the vehicle is impaired
Solution Approach 1:
The patent replaces the mechanical door handle system with a piezoelectric sensing system. The piezoelectric converter detects mechanical pressure applied to the touch surface and converts it into an electrical signal, which then triggers the door unlocking mechanism. This substitution eliminates the need for visible external handles while maintaining door opening functionality.
Solution Approach 2:
The patent introduces a piezoelectric converter as an intermediary between the user's mechanical input (fingertip pressure) and the electronic door unlocking system. This intermediary component translates the mechanical deformation of the touch surface into electrical signals that control the door lock, enabling invisible operation.
2Reliability
If a conventional switching device is used on the exterior, then the door can be unlocked, but the device is exposed to dirt and moisture
Solution Approach 1:
The patent employs a flexible touch surface (window pane or body shell component) that serves as both the aesthetic cover and the operational interface. This thin film structure allows mechanical deformation for actuation while simultaneously protecting the piezoelectric converter from environmental exposure. The touch surface acts as a barrier against dirt and moisture while transmitting mechanical pressure to the sensor.
3Shape
If a piezoelectric converter is integrated behind the touch surface, then the visual appearance is maintained and components are protected, but the device complexity increases
Solution Approach 1:
The patent merges multiple functions into the touch surface: it serves as the aesthetic cover, the protective barrier, and the mechanical input interface. By integrating the piezoelectric converter directly behind this multi-functional surface, the design reduces the number of separate components needed, thereby simplifying the overall structure despite the advanced sensing technology employed.
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
The solution maintains a sleek appearance, protects the piezoelectric components from dirt and moisture, and reduces installation space while enabling secure and efficient operation of vehicle locks without visible switches or handles.
Implementation Method 1
A piezoelectric converter is arranged in the interior of the housing. When a person presses the touch surface with a finger, the transducer generates an electrical signal
Data Source
Figure 1~3
AI summary
Motor vehicle has a control device (6) at the vehicle exterior. The touch surface is formed by an area of a window pane (2) or by an outer shell of the component of car body, so that the control device on exterior side of vehicle is not visible or only visible through the window pane.