Wireless Proportional Flow Indication for Tire Inflation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional central tire inflation systems (CTIS) provide crude accuracy and only indicate air flow when it exceeds 1.2 cubic feet per minute, failing to provide precise flow rate information and identifying which tire is affected, leading to potential catastrophic failures like blowouts.
Innovation Solution
A wireless proportional flow indication system using a venturi with pressure sensors and a microcontroller to calculate air flow rates, broadcasting flow data wirelessly for real-time monitoring and alerting operators to issues before they become critical.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional flow indication systems are used, then the system structure is simple, but the measurement precision is insufficient and cannot provide accurate flow rate information
Solution Approach 1:
The patent replaces conventional mechanical flow switches with a wireless electronic measurement system comprising pressure sensors, microcontroller, and wireless transmission module. This substitution enables precise digital measurement of flow rates while eliminating complex mechanical linkages and providing accurate real-time data transmission to the control cabin.
Solution Approach 2:
The patent changes the measurement parameter from simple on/off flow indication to continuous flow rate measurement by using pressure differential across a venturi combined with electronic sensors. This parameter change transforms the crude mechanical switch signal into precise digital flow rate data that can be monitored and analyzed.
2Loss of information
If conventional flow switches are used, then the device complexity is low, but the information completeness is insufficient and cannot identify which tire is affected
Solution Approach 1:
The patent segments the flow measurement system into individual wheel-end units, each with its own pressure sensors and flow measurement capability. This segmentation enables independent monitoring of each tire's air flow status and allows identification of which specific tire is leaking or requires inflation, providing complete diagnostic information.
Solution Approach 2:
The patent introduces wireless communication as an intermediary between the wheel-end sensors and the control cabin display. This wireless intermediary transmits tire identification and flow rate information without requiring physical wiring harnesses, maintaining system simplicity while achieving complete information delivery to the operator.
3Reliability
If threshold-based flow indication is used, then the ease of operation is high, but the reliability is insufficient and may miss early warning signs of tire issues
Solution Approach 1:
The patent implements continuous feedback by constantly monitoring flow rates and comparing them against threshold values. When flow exceeds the threshold, the system provides immediate visual warning to the operator. This feedback mechanism enables early detection of tire leaks before they become critical failures, significantly improving reliability while maintaining simple threshold-based operation.
Solution Approach 2:
The patent performs preliminary warning by detecting abnormal flow rates before they indicate catastrophic tire failure. The continuous monitoring and threshold comparison system alerts operators to developing tire issues early, allowing preventive action to be taken before the tire actually fails, thus improving reliability through early intervention.
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
Enables precise air flow monitoring, identifies affected tires, and provides timely warnings, reducing the risk of catastrophic failures and improving vehicle maintenance efficiency by offering detailed flow rate information and reducing unnecessary maintenance costs.
Implementation Method 1
determined through the creation of a venturi with an inlet port and an exit port and a pressure sensor at the inlet and throat
Implementation Method 2
A pressure reading is taken on the inlet and outlet ports and flow of the air flowing through the venturi is calculated based on the pressure differential
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A flow indication system for a central tire inflation system is provided. The flow indication system provides a venturi in fluid communication with the conduit providing air to a tire. A pressure reading is taken at the inlet and throat of the venturi and the air flowing through the venturi is calculated based on the pressure differential. According to some embodiments, the pressure readings are provided to a microcontroller that uses a table and interpolation algorithms to calculate the flow of the air flowing through the venturi, such as the mass of air in a given unit of time (grams/second for example). In one embodiment, two separate pressure sensors are coupled to different ends of a narrowed orifice that causes a pressure change in the flow as flow rate increases in the throat of the sensor. This pressure change is then used to calculate a proportional flow that can then be broadcast to various parties instead of an on/off reading.