Piezoelectric Tire Sensor Mounting for Battery-Free TPMS
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional Tire Pressure Monitoring Systems (TPMS) with disposable batteries have limitations in detection and transmission frequency due to power conservation, and are unable to detect parameters like tire thickness and acceleration, leading to inadequate safety against tire blowouts.
Innovation Solution
A self-powered sensing and transmitting device using a piezoelectric generator, encapsulation support structure, and fixed support structure, which converts mechanical energy from tire deformation into electrical energy to power sensors and transmitters, enabling frequent tire parameter monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If detection and transmission frequency is increased, then safety factor is improved, but power consumption increases and battery depletes quickly
Solution Approach 1:
The piezoelectric generator enables the system to power itself by converting mechanical energy from tire deformation into electrical energy. This self-powered mechanism eliminates the need for external battery replacement and allows for increased detection and transmission frequency without depleting a disposable battery, thereby improving safety factor while managing power consumption sustainably.
2Reliability
If disposable battery is sealed by encapsulant for protection, then reliability in harsh environment is improved, but ease of repair and replacement is worsened
Solution Approach 1:
The self-powered piezoelectric generator eliminates the need for disposable batteries entirely, converting mechanical energy from tire deformation into electrical power. This removes the encapsulation constraint and enables easy removal and replacement of the sensing device by consumers, improving ease of repair while maintaining reliability through the durable piezoelectric power generation mechanism.
3Stability of the object's composition
If TPMS is screwed on rim for stable installation, then installation stability is improved, but measurement capability is worsened
Solution Approach 1:
The device separates the power generation function (piezoelectric generator) from the mounting structure, allowing the sensing device to be attached to the tire interior surface rather than screwed to the rim. This segmentation enables the device to detect tire contact parameters like thickness, acceleration, and vertical load while maintaining stable installation through alternative mounting methods.
Solution Approach 2:
The device transitions from rim-mounted (external dimension) to tire interior surface-mounted (internal dimension). This dimensional change allows the sensing device to be positioned where it can detect tire contact parameters directly, improving measurement precision while maintaining installation stability through the tire's internal surface attachment.
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 device provides real-time tire pressure and other parameter monitoring with increased detection frequency, enhancing safety by reducing the interval between transmissions and eliminating the need for disposable batteries, allowing for reusable and detachable installation on new tires.
Implementation Method 1
a self-powered sensing and transmitting device using piezoelectricity for sensing and transmitting
Data Source
AI summary
A self-powered sensing and transmitting device is provided and includes a piezoelectric generator, a carrying structure stacked with the piezoelectric generator, an encapsulation support structure including an encapsulation portion encapsulating the piezoelectric generator and the carrying structure and two supporting portions connected to two ends of the encapsulation portion, and a fixed support structure for being correspondingly coupled with the two supporting portions and fixed on a flexible surface. The self-powered sensing and transmitting device can be applied to a tire monitoring system and a motion monitoring system.