Tire Sensor Discrimination Using RFID Activation Status
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Solution Overview
Problem
Existing tire fitting systems struggle to accurately associate tire sensors with their corresponding RFID tags in noisy environments with multiple transmitting sensors, leading to confusion and incorrect pairings.
Innovation Solution
A method and system that discriminates between tire sensors by receiving status information from RFID tags and tire sensors, using activation methods such as RF signals or pressure changes, and determining the correct association based on this information, including time stamps for tire sensor activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple tire sensors transmit signals simultaneously in a noisy environment, then the system can collect data from all sensors, but the system cannot accurately determine which sensor corresponds to which RFID tag
Solution Approach 1:
The system performs preliminary actions by having sensors transmit their status information (activation method and timestamp) before the association decision is made. This allows the fitting system to receive and process sensor signals in advance, establishing a temporal sequence that enables accurate matching with RFID tags even when multiple sensors transmit simultaneously.
Solution Approach 2:
The system uses feedback by comparing the received sensor status information (activation method and timestamp) with the RFID tag data to determine correct associations. The status information acts as feedback that confirms which sensor is currently being worked on, allowing the system to resolve ambiguities in noisy environments with multiple transmitting sensors.
2Loss of information
If the system receives signals from multiple tire sensors simultaneously, then all sensor data is captured, but confusion arises about which sensor to associate with the RFID tag
Solution Approach 1:
The system segments the sensor information into distinct components: activation method (RF signal or pressure change) and activation timestamp. This segmentation allows the fitting system to process and compare specific aspects of sensor signals independently, making it easier to determine which sensor corresponds to the RFID tag without being overwhelmed by the full complexity of simultaneous multi-sensor transmissions.
3Reliability
If the system uses status information including activation time to discriminate sensors, then accurate association is achieved, but the system requires processing additional data parameters
Solution Approach 1:
The status information including activation timestamp is captured and stored preliminarily before the association decision is required. This preliminary capture of temporal data allows the system to make accurate associations without requiring complex real-time processing, as the temporal sequence is already established when the signals are received.
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
Ensures unambiguous association of tire sensors with their correct RFID tags, improving the accuracy and efficiency of tire fitting processes by eliminating confusion in noisy environments.
Implementation Method 1
receiving an identity of an RFID tag mounted on a rim, or in a tire, of a wheel
Implementation Method 2
TPMS/THS systems also normally employ Radio Frequency, RF, transmissions operating on specifically dedicated frequencies for transmitting its sensor data
Data Source
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AI summary
A tire fitting system and a method therein for discriminating between tire sensors of a wheel to be assembled on a vehicle is provided. The tire fitting system comprising a processing circuitry configured to receive an identity of an RFID tag mounted on a rim, or in a tire, of a wheel. The processing circuitry is also configured to receive, from the at least two tire sensors, tire sensor signals comprising status information indicating how their respective tire sensor was activated. The processing circuitry is further configured to determine which identity of the at least two tire sensors is to be associated with the identity of the RFID tag based on the status information. A computer program product and a carrier is also provided.