Tire Pressure Measurement Using Circuit Restriction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tire pressure measurement and regulation systems face instability issues, leading to inaccurate measurements and frequent air injection, which can result in abnormal tire pressure increases.
Innovation Solution
A device with a pressure drop production means, such as a constriction, to stabilize air pressure in the circuit, allowing for precise measurements without stabilization wait times and enabling reliable pressure regulation through solenoid valves and check valves for independent tire control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the circuit is fed with compressed air to open the check valve and place the circuit and tire in fluid communication for pressure measurement, then the pressure measurement can be performed, but the compressed air feed must be stopped and pressure stabilization must be awaited, making the process lengthy and restrictive
Solution Approach 1:
A restrictor is introduced as an intermediary element in the air feed circuit to create a controlled pressure drop. This restrictor acts as a mediator that stabilizes the pressure upstream without requiring the check valve to be opened, thereby eliminating the need to stop air feed and wait for stabilization. The restrictor enables continuous measurement while maintaining precision.
Solution Approach 2:
The restrictor is positioned upstream to preliminarily stabilize the pressure before it reaches the measurement point. This preliminary pressure stabilization occurs continuously during air feed, eliminating the need for subsequent stabilization waiting periods after stopping the air feed.
2Measurement precision
If pressure measurements are frequently performed by injecting air into the tire, then pressure regulation can be monitored, but the tire pressure increases abnormally due to repeated air injection
Solution Approach 1:
The circuit is segmented into an upstream portion (before the restrictor) and a downstream portion (after the restrictor). Pressure measurements are performed in the upstream portion which is isolated from the tire by the restrictor and check valve arrangement. This segmentation allows frequent measurements without transferring air to the tire, thus preventing abnormal pressure increase while maintaining monitoring accuracy.
Solution Approach 2:
The restrictor serves as an intermediary that decouples the measurement system from the tire. By measuring pressure upstream of the restrictor, the system can monitor tire pressure indirectly without directly injecting air into the tire, thereby preventing the harmful effect of abnormal inflation while maintaining measurement capability.
3Ease of operation
If the check valve is used to control air flow into the tire, then pressure regulation is possible, but the pressure in the circuit remains unstable making precise measurement difficult
Solution Approach 1:
The restrictor is introduced as an intermediary element between the air source and the check valve to stabilize the pressure in the upstream circuit. This restrictor creates a controlled pressure drop that dampens pressure fluctuations, thereby stabilizing the circuit pressure while maintaining the simplicity of check valve operation for pressure control.
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 provides stable pressure measurements during inflation without air injection, allowing for precise tire pressure regulation and efficient air reuse between tires, reducing energy consumption and preventing abnormal inflation.
Implementation Method 1
the circuit comprises means interposed in the circuit, which are designed to bring about a forced pressure drop, the pressure drop of the circuit downstream from the pressure drop production means being less than 10% of the pressure drop produced by the pressure drop production means
Data Source
AI summary
The pressure of a vehicle tire fitted on a vehicle wheel is measured and regulated, utilizing a source of compressed air, a check valve leading to an interior of the tire, and an air feed circuit connecting the air source to the check valve. Compressed air is fed from the air source into the circuit and against the check valve to tend to open the check valve. A pressure drop is imposed at a point in the circuit, wherein a resulting pressure drop in the circuit downstream of such point and upstream of the check valve is less than 10% of the pressure drop at the point. A measurement is made of the pressure in the circuit at a location downstream of the point, or in the tire itself. The evolution of the pressure measured in step D is analyzed as a function of time, to determine whether the check valve has been opened.