Tire Contact State Estimation via Correlation Strength Analysis
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Solution Overview
Problem
Existing methods for estimating tire contact states with a vehicle on a road surface are overly complex and inefficient, requiring multiple systems to accurately determine necessary information for driving safety.
Innovation Solution
A tire contact state estimation method that acquires information on rotational velocity, braking and driving force, slip angle, and generated lateral force, calculates correlation strengths, and detects changes to estimate road surface conditions, tire internal pressure, and tire abrasion states without a complicated system, using existing detection devices and statistical processing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods use multiple detection systems and complex correction processes to estimate tire contact state, then estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple detection functions into a single estimation system that uses correlation strength calculation between rotational velocity and braking/driving force, plus slip angle and lateral force, to simultaneously estimate road surface friction coefficient, tire internal pressure, and tire abrasion state without requiring separate detection systems for each parameter
Solution Approach 2:
The system uses existing vehicle sensors (rotational velocity sensor, braking/driving force sensor, slip angle sensor, lateral force sensor) and performs self-diagnosis through statistical correlation analysis, eliminating the need for additional dedicated detection devices while maintaining estimation accuracy
2Measurement precision
If conventional methods calculate multiple estimated values and detect actual values for correction, then estimation accuracy is improved, but loss of time increases
Solution Approach 1:
The patent changes the estimation approach from calculating multiple separate estimated values to calculating a single correlation strength parameter that directly indicates tire contact state, reducing computational steps while maintaining accuracy through statistical correlation analysis between paired parameters
Data Source
AI summary
A tire contact state estimation method includes: an information acquisition step of acquiring information of the tire; a correlation strength calculation step of calculating a first correlation strength between the rotational velocity and the braking and driving force, and also calculating a second correlation strength between the slip angle and the generated lateral force; a change detection step of detecting whether the first correlation strength has increased or decreased by a first threshold or more with respect to a predetermined first reference value, and also detecting whether the second correlation strength has increased or decreased by a second threshold or more with respect to a predetermined second reference value; and an estimation step of estimating at least two of the following: a condition of a road surface in contact with the tire, a tire internal pressure state, and a tire abrasion state.