Tire Pressure Measurement Using a Temperature-Balanced Reference Gas
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current tire pressure measurement systems for aircraft require temperature correction, which complicates on-board systems and extends maintenance operations, as the pressure measurement is sensitive to gas temperature and external conditions.
Innovation Solution
The equipment measures tire inflation pressure by bringing the reference gas and inflation gas to identical temperatures, allowing the opposing pressures to compensate each other, thus eliminating the need for temperature correction, using a piston and linear displacement sensor to determine pressure from the piston's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature correction is applied to pressure measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The invention changes the reference parameter from a fixed reference pressure to a reference pressure that varies with temperature. By using a reference gas chamber whose pressure changes with temperature, the system automatically compensates for temperature effects without requiring complex correction algorithms or additional sensors.
Solution Approach 2:
The reference gas chamber acts as an intermediary that mediates between the temperature environment and the measurement system. It translates temperature variations into corresponding pressure variations that automatically compensate for thermal effects on the measurement, eliminating the need for direct temperature measurement and correction calculations.
2Measurement precision
If temperature correction is applied to pressure measurement, then measurement precision is improved, but maintenance time increases
Solution Approach 1:
The measurement system performs self-correction for temperature effects through the reference gas chamber. The system automatically compensates for temperature variations without requiring external intervention, calibration adjustments, or maintenance personnel to perform correction procedures, thereby reducing maintenance time and operational complexity.
3Reliability
If a conduit is used to connect tire to pressure sensor, then measurement reliability is improved, but the measurement process becomes more complex
Solution Approach 1:
The invention merges the reference gas chamber with the measurement chamber in a single integrated body. Both chambers share the same physical space and are subjected to the same temperature conditions, eliminating the need for separate temperature measurement systems and simplifying the overall measurement process while maintaining reliable pressure differential measurement.
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 solution allows for accurate and temperature-independent tire pressure measurement, simplifying the process and reducing maintenance time by directly correlating the piston's position with the tire pressure without requiring temperature adjustments.
Implementation Method 1
The piston (25) responds to pressure differences between the reference gas and the inflation gas by moving to a new position
Implementation Method 2
The equipment uses a piston and linear displacement sensor to determine pressure from the piston's position
Data Source
Figure 1~2b
Figure 3a~5
AI summary
The equipment has a communication opening (19) for putting an internal volume of a body (16) into communication with an inflation chamber. A piston (25) is slidably mounted in the body to define a watertight separation between a chamber (26) containing a given quantity of a reference gas and another chamber (27) into which the opening leads such that the piston is subjected to opposing pressures existing in each of the two chambers. A linear variable differential transformer (LVDT) type sensor (30) senses a position of the piston in the body. The inflation chamber is situated between a rim and a tire of a wheel and containing inflation gas.