Vehicle Tire Thermal Anomaly Detection via Pressure-Temperature Ratio

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Solution Overview

Problem

Current vehicle tire-wheel assembly monitoring systems fail to effectively detect and locate thermal anomalies, such as abnormal heating, which can be caused by issues like malfunctioning brake pads or cooling systems, without additional sensors or leading to false alarms due to sensor precision and usage variations.

Innovation Solution

A method involving sensors attached to the mounting wheel to measure pressure and temperature, calculating a monitoring ratio, and tracking its evolution to detect thermal anomalies, with statistical discrimination to differentiate between anomalies and normal variations, allowing for alerts and maintenance assistance without additional sensors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If pressure and temperature monitoring is performed using existing sensors, then vehicle safety and operation information are improved, but the ability to detect thermal anomalies in mounted components (brakes, suspension, drivetrain) is insufficient

Engineering Contradiction:
Improvevehicle operation monitoringVSAvoidthermal anomaly detection
Core Design Contradiction:
ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent applies multi-functionality by enabling existing pressure and temperature sensors to serve dual purposes: their traditional function of monitoring tyre conditions and an additional function of detecting thermal anomalies in mounted vehicle components. The temperature sensor detects both tyre temperature and thermal radiation/conduction from adjacent components like brakes, suspension, and drivetrain elements, allowing a single sensor system to provide multiple monitoring capabilities without adding dedicated detection devices.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent uses thermal conduction and radiation as intermediary mechanisms to transfer thermal information from mounted components to the temperature sensor. The sensor acts as an intermediary detection point that receives thermal energy transmitted through conduction via mounting surfaces or radiation through space, enabling indirect detection of thermal anomalies in components that are not directly instrumented.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Difficulty of detecting and measuring

If additional sensors are added to detect thermal anomalies in mounted components, then detection capability is improved, but device complexity and cost increase

Engineering Contradiction:
Improvethermal anomaly detection capabilityVSAvoidsensor system complexity
Core Design Contradiction:
Difficulty of detecting and measuringVSDevice complexity

Solution Approach 1:

The patent eliminates the need for additional dedicated thermal sensors by making existing temperature sensors multi-functional. The same temperature sensor used for tyre monitoring is configured to also detect thermal anomalies in mounted components through conduction and radiation, thereby improving detection capability without increasing device complexity or sensor quantity.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The existing sensor system serves itself by extending its monitoring capability to include mounted components. The temperature sensor, already present in the system, automatically detects thermal anomalies from adjacent components without requiring separate detection infrastructure, making the system self-sufficient for both tyre monitoring and component thermal detection.

Inventive Principle:
Principle #25Self-service

3Ease of operation

If temperature threshold alerts are used for anomaly detection, then simple detection is achieved, but false alarms increase due to sensor precision variations and usage conditions

Engineering Contradiction:
Improveanomaly detection simplicityVSAvoiddetection accuracy
Core Design Contradiction:
Ease of operationVSMeasurement precision

Solution Approach 1:

The patent implements feedback by continuously monitoring the relationship between pressure and temperature measurements and comparing them against expected physical relationships (such as Gay-Lussac's law). The system uses this feedback to distinguish between temperature changes caused by pressure variations (normal) and temperature changes caused by external thermal sources (anomalies), thereby reducing false alarms while maintaining simple threshold-based operation.

Inventive Principle:
Principle #23Feedback

Solution Approach 2:

The patent changes the detection parameter from absolute temperature threshold to a relative relationship between pressure and temperature. Instead of alerting when temperature exceeds a fixed threshold, the system monitors whether temperature deviations are proportional to pressure changes (normal) or exceed expected proportions (anomaly), improving detection accuracy while maintaining operational simplicity.

Inventive Principle:
Principle #35Parameter changes

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 enables the detection and location of thermal anomalies in vehicle components, such as the braking system, with reduced false alarms by using existing sensors, ensuring optimal vehicle operation and maintenance efficiency.

Implementation Method 1

Measuring the internal pressure and temperature of the tyre-wheel assembly using a sensor attached to the mounting wheel

Methodology Applied
Scientific EffectPressure sensing:

Implementation Method 2

Measuring the internal pressure and temperature of the tyre-wheel assembly using a sensor attached to the mounting wheel

Methodology Applied
Scientific EffectTemperature sensing:

Implementation Method 3

the sensor to escape the constraints of Gay-Lussac's law and detect not only the temperature of the pressurized air in the tyre-wheel assembly but also that of the mounting wheel which is generally made of a thermally conducting material such as steel for example

Methodology Applied
Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS11691464B2Methods for detecting and locating a thermal anomaly for a mounted assembly of a vehicle
Publication Date: 2023.07.04 MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)
  • US11691464B2 patent drawing
  • US11691464B2 patent drawing
  • US11691464B2 patent drawing

AI summary

A method for detecting a thermal anomaly during running of a tire-wheel assembly (3) of a vehicle (1) equipped with a mounting wheel (5) on which a pneumatic tire is mounted comprises the steps of measuring the internal pressure (P) and temperature (T) of the tire-wheel assembly (3) using a sensor (9) attached to the mounting wheel (5), calculating a monitoring ratio which is a function of the measured pressure and of the measured temperature, repeating the preceding steps and tracking the evolution in the value of the monitoring ratio in order to determine a thermal anomaly.