Dual-Chamber Tyre Apparatus with Active Pressure Control
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Solution Overview
Problem
Current tyre inflation systems for heavy-duty vehicles offer limited control over tyre pressure adjustments, leading to suboptimal fuel efficiency and tyre tread life, especially on varying road surfaces and terrain types, and lack the ability to maintain autonomous inflation in case of pressure failure.
Innovation Solution
A tyre apparatus with an inner chamber of higher tensile strength and pressure capacity than the outer tyre body, allowing for dynamic pressure adjustment through a dual valve system and an active control system that processes external parameters to optimize inflation pressure in real-time, using materials like Kevlar fibre for the inner chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single tyre chamber system is used, then the structure is simple, but the pressure control precision and adaptability to varying conditions deteriorate
Solution Approach 1:
The tyre pressure control system is segmented into two independent but interconnected chambers: an inner run-flat chamber and an outer tyre chamber. Each chamber can be independently inflated and deflated through separate fluid communication paths and valves, enabling independent pressure control. This segmentation allows the system to adapt to varying road conditions by adjusting each chamber's pressure separately, resolving the contradiction between structural simplicity and pressure control adaptability.
Solution Approach 2:
The inner run-flat chamber is nested within the outer tyre chamber, with the inner chamber positioned inside the tyre body. The inner chamber's inflatable volume is contained within the first inflatable volume of the tyre body. This nesting arrangement allows the system to maintain a relatively compact structure while providing dual-chamber functionality, thus balancing structural simplicity with enhanced adaptability.
2Device complexity
If tyre pressure is manually adjusted, then the system is simple, but the fuel efficiency optimization deteriorates
Solution Approach 1:
The system incorporates sensors that continuously monitor tyre pressure, vehicle speed, and acceleration. This feedback is processed by a control system that automatically adjusts the pressure in both chambers through the fluid communication paths and valves. By implementing automated feedback control, the system optimizes fuel efficiency by maintaining optimal tyre pressures without requiring manual intervention, resolving the contradiction between system simplicity and energy optimization.
3Loss of energy
If high pressure is used in the tyre body, then the rolling resistance decreases, but the risk of pressure loss and tyre failure increases
Solution Approach 1:
The inner run-flat chamber is pre-inflated to a high pressure (at least ten times that of the outer tyre body, e.g., 70 bar versus 7 bar) using material with greater tensile strength such as aramid fibre. This pre-inflation creates a protective cushion that can sustain the vehicle if the outer tyre chamber suffers pressure loss or failure. The high-pressure inner chamber ensures continued reliability and reduces rolling resistance by maintaining proper tyre shape, resolving the contradiction between energy loss and pressure stability.
4Measurement precision
If a dual chamber system with independent control is implemented, then the pressure control precision improves, but the device complexity increases
Solution Approach 1:
The fluid communication paths serve multiple functions: they enable pressure transfer from the inner chamber to the outer chamber, allow independent deflation of either chamber through separate valves, and facilitate automated pressure control based on sensor feedback. This multi-functionality reduces the need for additional complex components, allowing the dual-chamber system to achieve precise pressure control while minimizing the increase in overall device complexity.
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 enables improved fuel efficiency, extended tyre tread life, and run-flat protection by maintaining optimal tyre pressure autonomously, even in case of pressure failure, through the use of a dual valve system and an active control system that adjusts pressure based on external conditions.
Implementation Method 1
opening the first valve to allow pressure transfer from the second inflatable volume into the tyre body
Implementation Method 2
opening the second valve to allow pressure to vent from the tyre body to atmosphere
Implementation Method 3
The inner chamber may be constructed from an aromatic polyamide (aramid) fibre such as Kevlar® fibre. The physical properties of Kevlar® fibre make it a particularly suitable material choice for the inner chamber. In particular, Kevlar® fibre expands very little under pressure and has a tensile strength which is at least two orders of magnitude greater than that of natural rubber.
Data Source
AI summary
A tire apparatus is provided, the apparatus including a tire body for attachment to a wheel rim to define a first inflatable volume. An inner chamber defines a second inflatable volume which is located within the first inflatable volume of the tire body. A first fluid communication path is provided between the first and second inflatable volumes and a second fluid communication path is provided between the first inflatable volume and the atmosphere. A first valve opens and closes the first fluid communication path, and a second valve opens and closes the second fluid communication path. The tensile strength and pressure-containing capacity of the material structure of the second inflatable volume is greater than that of the tire first inflatable volume. A first fluid pressure within the first inflatable volume of the tire body is optimisable by opening the first valve to allow pressure transfer from the second inflatable volume into the tire body, and/or opening the second valve to allow pressure to vent from the tire body to atmosphere. A vehicle wheel and active tire pressure control system incorporating the tire apparatus are also provided.