TPMS Tire Position Identification Using RSSI and Doppler Signatures
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Solution Overview
Problem
Current tire pressure monitoring systems (TPMS) require manual retraining by a technician to update tire locations after rotation or replacement, which is inconvenient for vehicle owners and lacks a method for them to readily adjust the system.
Innovation Solution
The TPMS uses unique RSSI signal levels and statistics or Doppler shift information to identify the location of each tire by storing and comparing signal signatures over time, allowing the system to automatically detect and adapt to changes in tire positions without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual retraining by a technician is used to update tire locations, then the TPMS can accurately identify tire positions, but the process requires visiting a service center and loses time
Solution Approach 1:
The TPMS automatically detects and adapts to tire position changes using RSSI signal strength analysis without requiring manual intervention. The system self-calibrates by comparing signal characteristics from multiple receivers to identify which tire is in which position, eliminating the need for technician retraining and service center visits.
Solution Approach 2:
The system uses feedback from multiple receivers measuring RSSI values to continuously monitor and detect tire position changes. When a position change is detected, the system automatically adjusts its identification algorithm based on the feedback from signal strength variations across different receiver locations.
2Device complexity
If a single receiver is used in low-line TPMS, then the system is simpler, but the ability to automatically identify tire positions is reduced
Solution Approach 1:
The patent introduces signal strength (RSSI) as an intermediary parameter that enables position identification. By measuring the strength of signals received at different locations, the system can infer tire positions without requiring complex multi-receiver arrays, thus maintaining simplicity while enabling automatic adaptation.
Solution Approach 2:
The system uses changes in signal parameters (RSSI values) to detect tire position changes. By monitoring variations in signal strength characteristics over time and across receivers, the system can identify when tires have been moved and automatically recalibrate, adding adaptability without significantly increasing hardware 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 vehicle owners to easily update tire positions without visiting a service center, ensuring accurate pressure and temperature monitoring by automatically identifying and classifying the location of each tire based on received signal characteristics.
Implementation Method 1
The TPMS uses unique signature, such as RSSI signal levels and statistics or Doppler shift information, to identify the location of where the TPMS signal is being transmitted from
Implementation Method 2
The TPMS uses unique signature, such as RSSI signal levels and statistics or Doppler shift information, to identify the location of where the TPMS signal is being transmitted from
Data Source
AI summary
A TPMS that uses a unique signature, such as RSSI signal levels and statistics or Doppler shift information, to identify the location of where the TPMS signal is being transmitted from. The TPMS includes a separate transmitter unit provided in each tire, where each transmitter unit transmits TPMS signals including an ID code identifying the tire and the pressure in the tire. The TPMS also includes a receiver unit that receives the TPMS signals from each of the transmitter units, where the receiver unit stores an average or other classification of the signature over time to identify the location of the transmitter unit for a particular ID code. The receiver unit compares the new received TPMS signals to the classified signals to identify whether the ID code indicates that the position of the tire has changed.