TPMS Tire Localization Using Angular Position Index
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Solution Overview
Problem
Current tire localization methods in TPMS systems face delays and increased energy consumption due to waiting times for RF signal transmission, phase calculation, and memory requirements, which affect accuracy and battery life.
Innovation Solution
A tire localization system utilizing wheel speed sensors and tire pressure sensors that transmit an RF frame at predefined reference positions along the tire circumference, allowing for immediate RF frame transmission and reducing waiting times, with an electronic control unit processing the data to accurately localize tires without the need for extensive memory storage or complex processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the TPS waits until reaching a single predetermined reference position to transmit RF signal, then the tire location can be determined based on angular position and WSS counter information, but waiting time increases energy consumption and battery life is affected
Solution Approach 1:
The system pre-identifies multiple predetermined reference positions along the tire circumference where RF signals can be transmitted. Instead of waiting for a single reference position, the TPS can transmit at any of these pre-established positions, eliminating the waiting time while maintaining accurate location determination through correlation with WSS counter information.
2Measurement precision
If the TPS waits until reaching a single predetermined reference position to transmit RF signal, then the tire location can be determined, but waiting time is random and can range from microseconds to hundreds of milliseconds
Solution Approach 1:
Multiple reference positions are pre-established around the tire circumference. This allows the TPS to transmit RF signals at any of these positions without waiting, converting a time-dependent single-position system into a position-independent multi-position system that eliminates random waiting times while maintaining localization accuracy.
3Measurement precision
If the TPS transmits RF frame with additional time and phase information, then each tire location can be calculated based on angular position and time information, but current consumption increases compared to shorter RF frame lengths
Solution Approach 1:
The system uses WSS counter information as a reference copy that already contains timing and position data. Instead of transmitting redundant time and phase information in the RF frame, the TPS transmits a simplified frame that correlates with the WSS counter data already stored in the ECU, reducing frame length and current consumption while maintaining calculation accuracy.
4Measurement precision
If the ECU receiver records and stores WSS counter values for some duration, then tire location can be determined by searching through stored values, but additional memory space is required
Solution Approach 1:
The system correlates RF signal reception with WSS counter information that is already being recorded for ABS functions. Instead of storing extended periods of WSS data, the ECU uses the existing counter values at the moment of RF reception to determine tire location, eliminating the need for additional memory storage while maintaining localization accuracy.
5Measurement precision
If the waiting time is long and the vehicle undergoes acceleration or deceleration during the extrapolation period, then the phase error increases
Solution Approach 1:
Multiple reference positions are pre-established around the tire circumference, allowing immediate transmission without waiting. This eliminates the extrapolation period during vehicle acceleration or deceleration, preventing phase error accumulation while maintaining accurate phase measurement through direct correlation with WSS counter information.
Data Source
AI summary
Embodiments relate to tire localization systems and methods for tire pressure monitoring systems (TPMS). In embodiments, a tire pressure management system comprises a wheel speed sensor (WSS), a tire pressure sensor (TPS) that can comprise circuitry and/or sensors configured to measure or record tire pressure data and TPS phase data, and an electronic control unit (ECU) that can comprise circuitry and/or sensors configured to process the speed sensor data and TPS data. TPMS systems and methods utilize a reference position index transmitted by the TPS to determine a constant value pattern of WSS data representative of a specific tire in order to localize the set of tires.