Electroactive Polymer Tire Wear Sensor with RFID
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Solution Overview
Problem
Existing tire wear monitoring systems are inefficient and inconvenient for vehicle operators, as they require manual visual inspection, are difficult to use in adverse conditions, and lack digital or numerical measurement capabilities, making it challenging to accurately assess tread wear and rate of wear.
Innovation Solution
A tire-embedded tread wear sensor system using electroactive polymers that emit a voltage in response to tread deformation, allowing for digital and wireless monitoring of tread wear, with sensors mounted at different radial heights and locations, and communicating with RFID tags for data transmission to a reader.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If visual tread wear indicators (colored indicia or tie-bar elements) are used, then continuous wear information is provided to the operator, but the manufacturing complexity increases and manual inspection is still required
Solution Approach 1:
The patent replaces visual mechanical indicators (colored indicia and tie-bar elements) with an electrical sensing system. Electrical elements embedded in the tread generate signals based on tread depth changes, substituting the mechanical visual indication system with an electrical measurement and communication system that automatically transmits wear data to external devices.
Solution Approach 2:
The sensor system enables the tire to self-monitor and self-report its wear status. The electrical elements continuously measure tread depth and automatically transmit information via RFID tags and readers, eliminating the need for manual inspection by the vehicle operator while providing continuous digital wear data.
2Ease of operation
If visual inspection methods are used, then wear information can be obtained, but the process is slow and inconvenient especially in adverse conditions
Solution Approach 1:
The patent replaces manual visual inspection with an automated electrical sensing and wireless communication system. Electrical elements embedded in the tread continuously monitor wear and transmit data via RFID tags to readers, eliminating the need for manual inspection by the vehicle operator.
Solution Approach 2:
The sensor system enables continuous monitoring of tread wear rather than periodic manual inspection. The electrical elements continuously measure tread depth and the system continuously transmits wear status data, providing uninterrupted wear information that can be accessed at any time without requiring the vehicle to be stationary or the operator to physically inspect each tire.
3Loss of information
If visual wear indicators are used, then wear status can be determined, but numerical or digital data for computing wear rate is not provided
Solution Approach 1:
The patent replaces visual mechanical indicators with an electrical sensing system that generates numerical and digital data. Electrical elements embedded in the tread produce electrical signals proportional to tread depth, which are converted into digital wear measurements and transmitted via RFID tags, enabling computational analysis of wear rates and patterns.
Solution Approach 2:
The sensor system implements continuous feedback by measuring tread depth with electrical elements and transmitting this data through RFID tags and readers to external devices. This feedback loop provides real-time wear information that can be used to monitor tire condition, calculate wear rates, and predict remaining service life, enabling proactive tire management.
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 convenient, accurate, and continuous monitoring of tire wear, allowing for timely replacement decisions and reducing the complexity of tire manufacturing by providing numerical and digital data on tread wear status and rate.
Implementation Method 1
the electrical element is made of an electroactive polymer for emitting a voltage in response to deformation of the tread
Data Source
AI summary
A tread wear indicator is affixed to a respective tire tread element. The indicator is constructed as a plurality of electroactive sensor elements operatively configured and located to sequentially sacrificially abrade and change in electrical signal responsive to a progressive tread wear of the respective tread element. The electroactive elements are connected by printed circuitry that communicates an electrical signal to a passive RFID sensor tag that can be powered and read by a RFID reader.