Tire Pressure-Temperature Ratio Monitoring for Rapid Leak Detection
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Solution Overview
Problem
Existing tire monitoring systems are slow to detect under-inflation or punctures due to measurement noise and errors in information transmission, leading to ineffective rapid detection of tire issues.
Innovation Solution
A method that calculates the variation in the absolute ratio of tire pressure to temperature over a short period and sends an alert if this variation exceeds a threshold, allowing for quick detection of air mass changes and distinguishing between punctures and climatic pressure variations, with the alert message including additional information for clarity and encryption for robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure and temperature measurements are reported periodically by sensors, then the system can monitor tire status, but the detection speed is slow due to measurement noise and transmission errors
Solution Approach 1:
The patent pre-calculates and stores pressure thresholds for different tire states (normal, under-inflated, flat, over-pressurized) based on temperature conditions. When a measurement is taken, the system immediately compares the current pressure against the pre-determined threshold for the current temperature, eliminating the need for complex real-time analysis and digital filtering. This preliminary preparation enables instant detection without waiting for multiple periodic measurements.
Solution Approach 2:
The patent transforms the monitoring approach from periodic pressure-only measurements to continuous evaluation of the pressure-temperature relationship. By monitoring how pressure changes relative to temperature changes (using the ideal gas law relationship), the system can detect leaks in real-time regardless of the periodic measurement schedule, converting a time-discrete problem into a continuous physical relationship assessment.
2Reliability
If digital filtering and threshold crossing counters are used to confirm under-inflation, then false alarms are reduced, but the detection becomes slower and less effective for rapid puncture detection
Solution Approach 1:
The patent extracts and removes the harmful elements of digital filtering and counter-based threshold crossing from the detection system. Instead of requiring multiple filtered measurements or counter increments, the system uses a single direct comparison against pre-calculated thresholds that already account for normal variations. This extraction of unnecessary processing steps eliminates the delay caused by filtering while maintaining reliability through physically-based threshold determination.
Solution Approach 2:
The patent introduces pre-calculated pressure thresholds as an intermediary between raw sensor measurements and final alert generation. These thresholds act as a mediator that encapsulates the complexity of normal pressure variations due to temperature, allowing the system to make reliable detection decisions through simple comparison rather than complex real-time filtering and analysis.
3Use of energy by moving object
If sensors send information periodically via wireless link, then power consumption occurs, but rapid alerting of punctures is not achieved
Solution Approach 1:
The patent maintains periodic sensor operation for power conservation but transforms the periodic measurement into a continuous monitoring capability through physical law-based analysis. The sensor still takes periodic measurements, but the system uses the pressure-temperature relationship to continuously assess leak conditions, enabling rapid alerting without requiring continuous or high-frequency measurements. Alerts are transmitted immediately when the physical relationship indicates a leak, regardless of the periodic measurement schedule.
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
Enables rapid and robust alerting of tire leaks or punctures, reducing false alarms and conserving battery life by eliminating periodic measurement transmissions, while providing detailed information for accurate data verification.
Implementation Method 1
a step of measuring a pressure in said tire
Implementation Method 2
a step of measuring a temperature in said tire
Implementation Method 3
calculating a variation in absolute value of the ratio between said pressure measured and said measured temperature... the relationship between the pressure and the temperature of the tire being significant of the mass of air contained in the tire
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a method for monitoring a tyre of a motor vehicle, implemented in a wheel and comprising: a step (E1) for measuring (T(k)) a temperature of the tyre, a step (E2) for measuring (P(k)) a pressure of the tyre, - a step (E3) for calculating a variation, in absolute value, of the ratio between the measured pressure and the measured temperature, - a step (E4) for comparing the calculated variation to a predetermined threshold (seuil_P), - and a step (E5) for sending an alert message to a computer of the vehicle if the calculated variation is above the predetermined threshold (seuil_P).