Composite Piezoelectric Element With Buffer Zone for Directional Tire Sensing
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Solution Overview
Problem
Existing tire sensors struggle to measure deformation in specific directions with high sensitivity and accuracy due to the influence of deformation in other directions and the inhibiting effect of mold resin on the deformation of sheet-like piezoelectric sensors.
Innovation Solution
A composite piezoelectric element with a measuring unit and a buffer portion is designed to enhance anisotropy in measurement sensitivity. The buffer portion, which lacks a piezoelectric substance layer, allows for directional sensitivity by buffering forces in non-specific directions, thereby enabling high sensitivity and accuracy in measuring deformation in a specific direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If piezoelectric films are disposed in different directions to measure deformation in different directions, then multi-directional measurement capability is improved, but measurement precision in a specific direction deteriorates due to influence from deformation in other directions
Solution Approach 1:
The piezoelectric element is divided into multiple independent piezoelectric films, each oriented in a specific direction. Each film independently measures deformation in its designated direction, eliminating cross-directional interference while maintaining multi-directional measurement capability.
Solution Approach 2:
Each piezoelectric film is designed with specific local properties (orientation, position, and piezoelectric material characteristics) optimized for measuring deformation in a particular direction. This local optimization ensures high measurement precision in the specific direction each film is designed for.
2Reliability
If sheet-like piezoelectric sensor is sealed with mold resin to protect it, then reliability is improved, but detection sensitivity deteriorates due to inhibition of piezoelectric sensor deformation
Solution Approach 1:
The sealing structure is segmented into multiple regions: hard resin portions for structural support and protection, and soft resin portions for allowing piezoelectric sensor deformation. This segmentation enables both protection and sensitivity to coexist.
Solution Approach 2:
Different regions of the sealing resin are assigned different local properties (hardness/softness) based on their functional requirements. The hard resin provides protection where structural integrity is needed, while the soft resin allows deformation where sensitivity is required.
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 composite piezoelectric element effectively reduces the influence of deformation in non-specific directions, allowing for precise measurement of deformation in specific directions with enhanced sensitivity and accuracy.
Implementation Method 1
Piezoelectric elements have the function of converting electrical energy and mechanical energy to each other and are used as various actuators and sensors. For example, a film-like piezoelectric element having flexibility is sometimes used to measure the condition of a tire using electrical energy generated by deformation.
Data Source
AI summary
A composite piezoelectric element includes a first electrode layer, a piezoelectric substance layer disposed on the first electrode layer, and a second electrode layer disposed on the piezoelectric substance layer, and, in plan view, a measuring unit including the first electrode layer, the piezoelectric substance layer, and the second electrode layer and a buffer portion in which the piezoelectric substance layer is not provided.