Central Tyre Inflation System Compressor Noise and Heat Management
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Solution Overview
Problem
Implementing a central tyre inflation system (CTIS) in consumer vehicles is challenging due to limited space and the need for noise reduction, which often results in compressor overheating, as the noise generated by the CTIS compressor is unacceptable in these vehicles.
Innovation Solution
A CTIS design that includes pneumatic control valves, a valve block with multiple air sources, and an electronic control unit (ECU) to manage tyre pressure, with a focus on noise reduction and heat dissipation, using a single pressure sensor and look-up tables for inflation and deflation times, and a human-machine interface for user feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the compressor is enclosed in a noise-reducing housing, then noise is reduced, but heat dissipation is restricted causing compressor overheating
Solution Approach 1:
The harmful function of the housing (heat trapping) is separated from its useful function (noise reduction). The housing is designed with selective permeability: acoustically insulating to noise while thermally permeable to heat, extracting the harmful thermal effect while retaining the beneficial acoustic insulation.
Solution Approach 2:
The housing is designed with non-uniform thermal properties - acoustically insulating material throughout for noise reduction, but with strategically placed thermally conductive pathways and ventilation channels to enable heat dissipation from the compressor while maintaining overall acoustic isolation.
2Reliability
If CTIS components are installed in consumer vehicles, then tyre pressure control is achieved, but space availability is limited
Solution Approach 1:
The CTIS components are integrated with existing vehicle systems to serve multiple functions. The compressor serves both CTIS inflation and air suspension functions; the valve block integrates multiple control functions; the system shares control electronics with the vehicle's existing TPMS, thereby achieving reliable tyre pressure control while minimizing space consumption.
Solution Approach 2:
CTIS components are nested within existing vehicle structures. The compressor is mounted in the air suspension bay, valve blocks are integrated into wheel hub assemblies, and control units share space with existing vehicle electronics, effectively nesting the CTIS system within the vehicle's existing architectural framework to minimize additional space requirements.
Data Source
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AI summary
A central tyre inflation system (CTIS) (1) of a vehicle (VH) for supplying compressed air to a tyre (T) of the vehicle (VH) to compensate for air loss from the tyre (T), the CTIS (1) comprising: means for determining a rate of air loss from the tyre (T); a sensor arranged to measure a temperature of a compressor (9) of the CTIS (1); and an electronic control unit (ECU) (15) configured to: compare the rate of air loss with a rate of air loss threshold, determine, based on the compressor temperature and the comparison of the rate of air loss with the rate of air loss threshold, whether the CTIS (1) can support compensation for the air loss; and control the CTIS (1) to supply compressed air to the tyre (T) to compensate for the air loss if the CTIS (1) can support compensation for the air loss.