Tire Rolling Radius Estimation for Accurate Mileage Tracking
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Solution Overview
Problem
Existing tire mileage tracking systems face inaccuracies due to unreliable GPS data and error-prone determination of tire rolling radius, leading to incorrect speed and distance calculations.
Innovation Solution
A tire tracking system with multiple sensors affixed to the tire to measure tire-specific operating conditions such as temperature, pressure, and load, using a rolling radius estimation model compensated by these measurements, and a vehicle speed estimator to generate accurate vehicle speed and distance traveled calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS data is used to determine vehicle distance traveled, then the system can obtain distance information, but the data can be unreliable leading to inaccurate tire mileage calculations
Solution Approach 1:
The patent introduces tire-based sensors (pressure, temperature, acceleration) as intermediary measurements to indirectly determine vehicle distance traveled. Instead of directly relying on GPS, the system uses tire operating conditions as mediators to calculate distance through integration of acceleration data and tire rolling radius, thereby improving reliability while maintaining measurement capability
Solution Approach 2:
The patent replaces the GPS-based electronic positioning system with a mechanical sensing system using tire-mounted sensors that measure physical tire operating conditions (pressure, temperature, acceleration). This substitution uses fundamental mechanical principles to determine distance traveled through tire deformation and motion characteristics, providing more reliable data for tire-specific mileage tracking
2Measurement precision
If tire rolling radius is determined for speed calculation, then vehicle speed can be calculated from wheel speed signals, but the determination can be error prone leading to incorrect mileage calculations
Solution Approach 1:
The patent dynamically adjusts the rolling radius parameter based on real-time tire operating conditions (pressure, temperature, wear state, load). Instead of using a fixed rolling radius value, the system continuously updates this parameter to reflect actual tire state, thereby improving both the precision and reliability of speed calculations derived from wheel speed signals
Solution Approach 2:
The patent implements a feedback mechanism where tire sensor measurements (pressure, temperature, acceleration) continuously inform the rolling radius estimation. The system uses acceleration data and tire operating conditions to feedback-correct the rolling radius value, ensuring that speed and distance calculations always use the most accurate rolling radius parameter available for current tire conditions
3Measurement precision
If multiple tire-based sensors are used to measure tire operating conditions, then rolling radius estimation can be compensated for accuracy, but the device complexity increases
Solution Approach 1:
The patent makes the tire-based sensor system multi-functional by using the same sensors (pressure, temperature, acceleration) for multiple purposes: monitoring tire health, estimating rolling radius, calculating vehicle distance traveled, and determining tire-specific mileage. This universality allows the system to achieve high measurement precision without proportionally increasing complexity, as one sensor suite serves multiple measurement needs
Solution Approach 2:
The patent combines multiple measurement functions into a single integrated tire monitoring system. Instead of separate systems for pressure monitoring, temperature monitoring, and mileage tracking, the invention merges these functions into one cohesive system where tire sensors simultaneously provide data for all these purposes, reducing overall system complexity while maintaining high precision in rolling radius estimation
Data Source
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AI summary
A tire tracking system and method for tracking travel mileage experienced by a vehicle tire is disclosed. The system comprises a vehicle supported by at least one vehicle tire mounted to a wheel hub; a plurality of tire-based sensors affixed to the tire operative to generate a plurality of tire-specific operating condition measurements; a rolling radius estimation model operative to generate a compensated tire rolling radius based on the tire-specific operating condition measurements; and a vehicle speed estimator operative to generate a vehicle speed estimation based on the compensated tire rolling radius.