Piezoelectric Plate Vibration for Vehicle Sound and Haptic Feedback
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Solution Overview
Problem
Conventional motor vehicles lack a compact and efficient means to produce sound and sensory feedback without relying on traditional loudspeakers, and existing piezoelectric applications in vehicles do not effectively utilize piezoelectric elements for music production or tactile feedback.
Innovation Solution
A motor vehicle structural assembly featuring a thin, two-dimensional plate mounted in a structural element with a piezoelectric element controlled by a microprocessor, capable of vibrating to produce sound effects and sensory feedback, where the piezoelectric element operates as both an actuator and sensor to deform the plate, eliminating the need for additional sensors and conventional loudspeakers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional loudspeakers are used to produce sound in motor vehicles, then sound quality and volume are achieved, but device complexity and space requirements increase
Solution Approach 1:
The patent combines the sound generation function with existing structural elements of the vehicle (panels, trim pieces, structural components), merging multiple functions into a single integrated system. The piezoelectric element is embedded within or mounted on these structural components, eliminating the need for separate loudspeaker assemblies and reducing overall system complexity while maintaining sound production capability
Solution Approach 2:
The structural elements of the vehicle are designed to serve multiple functions: they provide structural support, aesthetic appearance, and sound generation capabilities. The piezoelectric elements mounted on these components enable the same structure to function as both a structural element and a sound source, reducing the number of separate components needed
2Measurement precision
If separate sensors are used to detect plate deformation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The piezoelectric element is designed to perform dual functions: it acts as an actuator to generate sound through plate deformation and as a sensor to detect the deformation caused by user touch or external forces. This multi-functionality eliminates the need for separate sensor components, reducing device complexity while maintaining the ability to detect plate deformation for haptic feedback control
Solution Approach 2:
The piezoelectric element serves itself by using its own electrical response to detected deformation to control its subsequent actuation. The element detects the touch force through its piezoelectric properties, processes this information, and uses it to generate appropriate haptic feedback, creating a self-contained system that reduces overall 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
Enables the production of music and force feedback through plate vibration, providing a compact and efficient sound generation system that enhances user experience by integrating piezoelectric elements within vehicle structures, such as roof liners, for both front and rear passengers.
Implementation Method 1
The piezoelectric element transforms an electric current into a mechanical pulsation (when it functions as an actuator)
Implementation Method 2
conversely it transforms a mechanical deformation into an electrical signal (when it functions as a receiver)
Implementation Method 3
the light propagating in the guide by total internal reflection
Data Source
Figure 1~2
AI summary
The invention relates to a motor vehicle structural assembly, characterized in that a plate (6) is mounted in a structural element (2) of the vehicle so as to be able to deform under mechanical stress. This deformation is achieved by means of at least one piezoelectric element (8), carried by the plate and controlled by a microprocessor (10). The piezoelectric element is capable of receiving control instructions from the microprocessor to deform said plate by vibration. The invention also relates to a motor vehicle comprising such a structural assembly, and more particularly applied to a roof (2).