Rolling Tire Deformation Sensing with Speed-Normalized Signals

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Solution Overview

Problem

Measurement signals from sensors on rolling terrestrial vehicles are disrupted by external forces and noise, making it difficult to accurately determine the deformation of the tyre casing, which is essential for obtaining reliable data for monitoring and maintenance services.

Innovation Solution

A method involving fastening sensors to the tyre casing to capture acceleration signals, normalizing them using a reference speed function, angularly resampling, and defining energy densities to isolate tyre casing deformation, while accounting for external forces and noise, thereby providing a cleaned measurement of deformation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Difficulty of detecting and measuring

If sensors are mounted on the tyre casing to measure deformation, then measurement capability is improved, but measurement precision deteriorates due to noise from rotation and external forces

Engineering Contradiction:

Improvemeasurement capabilityVSAvoiddeformation measurement precision

Core Design Contradiction:

Difficulty of detecting and measuringVSMeasurement precision

Solution Approach 1:

The patent segments the measurement signal into different frequency components and time intervals, separating the deformation signal from noise. By processing the signal in discrete segments and applying filtering operations, the method isolates the useful deformation information from rotational noise and external force interference.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces intermediate processing steps including reference speed signals, filtering operations, and signal normalization as mediators between the raw sensor output and the final deformation measurement. These intermediaries help transform the noisy raw signal into a clean deformation measurement.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If general variables like inflation pressure and temperature are measured, then monitoring capability is improved, but sensitivity to external forces and rotation effects deteriorates

Engineering Contradiction:

Improvemonitoring capabilityVSAvoidsensitivity to external forces

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent focuses on measuring local deformation at specific positions on the tyre casing rather than general variables. By using accelerometric sensors positioned at specific locations and measuring local acceleration variations, the method obtains deformation information that is less affected by global rotational effects while maintaining sensitivity to local loading conditions.

Inventive Principle:

Principle #3Local quality

3Measurement precision

If fine variables sensitive to rotation are measured, then measurement detail is improved, but reliability deteriorates due to disruption from rotational phenomena

Engineering Contradiction:

Improvemeasurement detailVSAvoidmeasurement reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent converts the harmful rotational noise into a useful reference signal. By measuring the rotation speed and using it to generate expected noise patterns, the method subtracts these patterns from the raw signal, transforming the rotational disturbance into a tool for noise cancellation and improving measurement reliability.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 method effectively isolates and measures tyre casing deformation, providing accurate scalar or vector values despite external influences, enhancing the precision and reliability of monitoring services.

Implementation Method 1

Fastening at least one sensor to the tyre casing at the crown of the tyre casing so as to generate at least one output signal sensitive to the acceleration, in the direction normal to the crown, applied to said sensor in the tyre casing

Methodology Applied

Scientific EffectAcceleration sensing: Accelerometer

Data Source

PatentUS20240336092A1Method for ascertaining the deformation of a tire subjected to a load while rolling

Publication Date: 2024.10.10 MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)

AI summary

A method for ascertaining the deformation of a tire comprises: fastening a sensor to the tire so as to generate an accelerometric signal in the direction normal to the crown; acquiring (201) a temporal wheel-turn signal SigTDR (101) comprising the amplitude of the acceleration while rolling; determining a reference speed Wreference (202) associated with a portion of the wheel-turn signal SigTDR; normalizing (203) the portion of the wheel-turn signal SigTDR by a variable which is a function F proportional to the square of Wreference; angularly resampling (204) the portion of the wheel-turn signal SigTDR; defining an energy density S (205) from the angularly resampled normalized wheel-turn signal SigTdR using a threshold A; and identifying the deformation of the tire Def % (206) as a function G of the energy density S.