Tire External Radius Estimation via Radial Acceleration
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Solution Overview
Problem
Current tire wear monitoring systems in vehicles lack precision and are complex, requiring additional electronics to measure tire wear, which increases design complexity and costs, and are unable to effectively monitor tire wear throughout the tire's life cycle.
Innovation Solution
A method using a radial acceleration sensor to estimate the external radius of a tire without direct measurements of geometric parameters, by acquiring signals during non-steady-state conditions, detecting local extrema, determining frequency variations, and calculating longitudinal acceleration to estimate the external radius, thereby simplifying the monitoring system and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors and electronics are installed to measure tire wear signals, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The radial acceleration sensor, originally designed for monitoring wheel acceleration, is made multi-functional by utilizing its existing capability to also measure tire wear through geometric parameter determination. This eliminates the need for dedicated wear sensors while maintaining measurement precision.
Solution Approach 2:
The existing radial acceleration sensor serves itself by providing dual functionality - it continues to monitor wheel acceleration while simultaneously enabling tire wear monitoring through the determination of external radius variations, reducing the need for additional electronic components.
2Measurement precision
If multiple sensors measuring different physical signals are installed, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The radial acceleration sensor is designed to perform multiple functions - monitoring both wheel acceleration and tire wear conditions. This multi-functionality reduces the total number of components required, simplifying the manufacturing process and reducing design costs while maintaining precise tire wear measurement capability.
3Measurement precision
If direct geometric measurements are taken to determine tire wear, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Direct mechanical or geometric measurement systems for determining tire wear are replaced by utilizing the radial acceleration sensor's electrical signals. The external radius is determined indirectly through signal processing of acceleration data, eliminating the need for complex mechanical measurement apparatus while maintaining precision.
Solution Approach 2:
The radial acceleration signal serves as an intermediary that indirectly provides information about the external radius and tire wear. Instead of directly measuring geometric parameters, the system uses acceleration signals as a mediator to derive wear information, simplifying the overall measurement system.
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
This approach allows for precise estimation of tire wear without additional electronic complexity, improving monitoring precision and reducing design costs while enabling continuous tire wear monitoring.
Implementation Method 1
said wheel comprising a radial acceleration sensor... acquisition, by the radial acceleration sensor, of a signal
Data Source
AI summary
A method for estimating the external radius Re of a tire fitted to a wheel of a motor vehicle, the wheel including a radial acceleration sensor. The method includes: acquiring, by the sensor, a signal S when the vehicle is in motion under non-steady-state conditions, detecting local extrema of the signal S which are respectively associated with phase values and with detection instants, determining a variation in frequency F′ of rotation of the wheel as a function of said phase values and of said detection instants, determining, for at least one detection instant, a discrepancy between the local extremum associated with said detection instant and a reference signal obtained by eliminating the fluctuations in the signal S, determining a value for the longitudinal acceleration Val of the vehicle as a function of the at least one discrepancy, estimating the external radius Re as a function of Val and F′.