Tire Pressure Monitoring Using Pressure-Temperature Ratio Baselines
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Solution Overview
Problem
Conventional tire state monitoring systems face challenges in accurately determining pressure drops due to inconsistencies in temperature measurement caused by sensor installation position, leading to inaccurate pressure determination.
Innovation Solution
A tire state monitoring system that includes an acquisition device to repeatedly acquire pressure and temperature, and a control device to calculate representative ratios between pressure and temperature over a first period, comparing these ratios with subsequent measurements to determine pressure drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature is used to determine pressure drop inside the tire, then the determination accuracy can be improved, but the measurement precision deteriorates when sensor installation position causes inconsistent temperature measurement
Solution Approach 1:
The system performs preliminary temperature measurement over a first period to calculate a temperature correction value before using it for pressure drop determination in the second period. This preliminary action allows the system to establish a baseline temperature characteristic that accounts for sensor installation position effects, thereby improving subsequent pressure determination accuracy despite temperature measurement inconsistencies
Solution Approach 2:
The system changes the parameter used for pressure determination from direct temperature measurement to a calculated temperature correction value derived from temperature measurements over time. By transforming the raw temperature data into a corrected parameter that compensates for installation position effects, the system maintains reliable pressure drop detection while overcoming temperature measurement precision limitations
2Reliability
If temperature correction is performed using preliminary measurements, then the pressure determination accuracy is improved, but the measurement time increases
Solution Approach 1:
The system performs temperature measurements and calculates the temperature correction value in advance during a first period, storing this correction data for use in subsequent pressure drop determinations. This preliminary action consolidates the time-consuming measurement process into an initial phase, allowing faster operation during the second period while maintaining high determination accuracy
Solution Approach 2:
The system divides the operation into periodic phases: a first period for temperature measurement and correction value calculation, and a second period for pressure drop determination using the pre-calculated correction. This periodic structure allows the system to perform comprehensive measurements only when needed, reducing overall time loss while maintaining reliable pressure monitoring
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
Improves the accuracy of detecting pressure drops within tires by using representative ratio calculations, even when temperature measurement is inconsistent due to sensor placement.
Implementation Method 1
a temperature sensor that measures the temperature inside the tire
Implementation Method 2
a pressure sensor that measures the pressure inside the tire
Data Source
AI summary
A tire state monitoring system comprises an acquisition device and a control device. The acquisition device is configured to repeatedly acquire a pressure and temperature inside a tire. The control device is configured to: calculate, based on ratios between the pressure and temperature acquired in a first period, a representative value of the ratios in the first period; and compare a ratio between the pressure and temperature acquired in a second period after the first period with the representative value, to determine whether the pressure inside the tire has dropped.