Tire Pressure Monitoring Using Temperature-Compensated Leak Detection
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Solution Overview
Problem
Existing wheel-state obtaining systems struggle to accurately differentiate between air pressure reductions due to temperature changes and slow leaks or blowouts in vehicle tires, leading to potential misidentification of tire conditions.
Innovation Solution
The system utilizes temperature conversion air pressure calculations based on the Boyle-Charles law to determine abnormal tire states by comparing the reduction amounts of air pressure across wheels, accounting for temperature variations and allowing for early detection of slow leaks before pressure drops below safety thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If air pressure detection is performed without temperature compensation, then the detection system is simple, but the measurement precision deteriorates due to temperature-induced pressure changes
Solution Approach 1:
The patent applies parameter changes by converting the detected air pressure value to a temperature-compensated equivalent pressure at a reference temperature. This allows the system to account for temperature effects without adding complex hardware, simply by changing the parameter (pressure) to reflect what it would be at standard temperature conditions.
Solution Approach 2:
The patent introduces temperature as an intermediary parameter to mediate between the actual pressure reading and the abnormality determination. By using temperature data to adjust the pressure interpretation, the system accurately distinguishes between pressure changes caused by temperature versus those caused by actual leaks.
2Reliability
If average air pressure values over time periods are used for comparison, then temperature effects can be partially averaged out, but the detection time increases and early leak detection is delayed
Solution Approach 1:
The patent performs preliminary temperature compensation on instantaneous pressure readings before abnormality determination. By pre-adjusting the pressure value to account for temperature effects, the system eliminates the need for time-based averaging, enabling immediate detection without waiting for extended measurement periods.
3Measurement precision
If temperature conversion air pressure calculation is performed, then the measurement precision improves by eliminating temperature interference, but the calculation complexity increases
Solution Approach 1:
The patent changes the pressure parameter from raw detected pressure to temperature-compensated equivalent pressure. This parameter transformation uses the relationship between temperature and pressure to adjust the reading, improving accuracy while maintaining relatively simple calculation logic based on established physical relationships.
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
Accurately identifies tire slow leaks and blowouts by distinguishing pressure changes due to temperature from actual leaks, enabling timely notifications and preventing underestimation of tire conditions.
Implementation Method 1
A temperature conversion air pressure, which is an air pressure of a tire of each of a plurality of wheels when a temperature of an inside of the tire is a set temperature, is obtained based on a detected air pressure and a detected temperature of the tire of each wheel
Data Source
AI summary
A wheel-state obtaining system includes: air pressure sensors each provided for a corresponding one of a plurality of wheels to detect an air pressure of a tire of the wheel; and temperature sensors each provided for a corresponding one of the wheels to detect a temperature of an inside of a tire of the wheel; and a controller. The controller obtains a temperature conversion air pressure, which is the air pressure of each tire when the temperature is a set temperature, based on a detected air pressure and a detected temperature. When a reduction amount of the temperature conversion air pressure of one of the wheels is greater than a reduction amount of the temperature conversion air pressure of each of other wheels except the one of the wheels, the controller determines that the air pressure of the tire of the one of the wheels is in an abnormal state.