Tire Inflator Pressure Correction for Accurate Auto Shut-Off
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Solution Overview
Problem
Existing tire inflators face inaccuracies in measuring tire pressure due to pressure drops in hoses and valve stems, leading to significant deviations in inflation pressure readings, which hinder accurate automatic shut-off mechanisms.
Innovation Solution
A tire inflator with a pressure sensing unit and control unit that pauses the inflator motor multiple times during inflation, using a quadratic function to calculate the actual tire pressure based on measured values, correcting for pressure drops and ensuring accurate inflation control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure gauge is installed on the air pump or at the end of the hose, then the inflation process can be monitored, but the pressure readings are significantly higher than the actual tire pressure due to pressure drops in the hose and valve stem
Solution Approach 1:
The patent changes the parameter being measured from direct inflation pressure (P0) to a derived actual tire pressure (P) calculated through a quadratic functional relationship P=aP0²+bP0+c. By transforming the measurement parameter and using multiple sampling points during inflation, the system compensates for pressure drops in the hose and valve stem, achieving accurate tire pressure measurement without requiring the pressure gauge to be directly inside the tire.
2Productivity
If the air pump operates continuously to inflate the tire quickly, then productivity is improved, but the pressure measurement accuracy deteriorates due to ongoing pressure drops
Solution Approach 1:
The patent implements periodic sampling of pressure values during the inflation process, taking multiple measurements (n≥3) at different stages. By periodically capturing pressure data points throughout the inflation cycle and using them to calculate the quadratic relationship, the system maintains continuous inflation operation while obtaining accurate pressure measurements at intervals, thus preserving both productivity and measurement precision.
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
The solution significantly reduces the error between measured and actual tire pressure, enabling precise inflation to the desired level with minimal deviation, enhancing safety and efficiency.
Implementation Method 1
the velocity of the gas in the hose is quite fast, resulting in a significant pressure drop at both ends of the hose. Additionally, the valve core also offers resistance to the flow of gas, causing a pressure difference between the end of the hose and the inside of the tire during inflation.
Data Source
AI summary
In order to solve the problem of discrepancies between inflation pressure and actual tire pressure during the tire inflation process, the present invention discloses a correction method and an inflator that implements this method. This significantly reduces the error between the pressure displayed on the gauge and the actual tire pressure, thereby enabling the functionality for automatic inflation and cessation of inflation for the tire.