Vehicle Tire Flexibility Estimation Under Stable Steering Conditions
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Solution Overview
Problem
Existing methods for estimating tire state changes, such as wear and replacement, lack accuracy due to noise from disturbances and driving style, reducing the reliability of tire condition detection.
Innovation Solution
An information processing device mounted on a vehicle calculates tire flexibility features under specific conditions where the applied force to the tire is stable, using angular velocity and acceleration thresholds to ensure accurate estimation of tire state changes, including both gradual and rapid changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tire state changes are estimated using sensor data from various vehicles, then tire condition detection can be performed, but measurement precision deteriorates due to noise from disturbances and driving style
Solution Approach 1:
The patent changes the parameters used for tire state estimation by selecting specific feature quantities (wheel velocity ratio and acceleration) and applying threshold-based filtering. This transforms the raw sensor data into conditioned parameters that are less sensitive to driving style variations and disturbances, thereby improving measurement precision while maintaining detection reliability
Solution Approach 2:
The patent extracts only the necessary components for accurate tire state estimation by calculating specific feature quantities (wheel velocity ratio and acceleration) from sensor data. This extraction process filters out unnecessary information and noise, focusing only on parameters that reliably indicate tire flexibility changes, thus resolving the contradiction between comprehensive detection and precise measurement
2Adaptability or versatility
If feature quantity calculation is performed under various driving conditions, then data collection is comprehensive, but measurement precision deteriorates due to fluctuating forces on the tire
Solution Approach 1:
The patent introduces threshold parameters (first threshold for wheel velocity ratio change, second threshold for acceleration change) that define acceptable ranges for force fluctuations. By comparing feature quantities against these thresholds, the system maintains adaptability to various driving conditions while ensuring measurements are taken only when force fluctuations remain within acceptable limits, thus preserving measurement precision
Data Source
AI summary
An information processing method includes determining whether at least one condition is satisfied, and calculating a feature quantity on flexibility of a tire when all of the at least one condition is satisfied. The at least one condition includes at least one of a first condition that an absolute value of an angular velocity of a steering wheel is smaller than a first reference value, and a second condition that an absolute value of a vector sum of vehicle accelerations of the vehicle including the steering wheel and wheels each provided with the tire is smaller than a second reference value.