Tire pressure sensing devices, systems and methods employing...

Details Tire pressure sensing devices, systems and methods employing... Tire pressure sensing devices, systems and methods employing...

2008-10-29

2011-12-06

Previl, Daniel (Department: 2612)

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

C340S568200, C340S693600

Reexamination Certificate

active

08072321

ABSTRACT:
A pressure sensing device, such as a tire pressure monitoring unit comprises a pressure sensor for measuring pressure of a fluid, such as air or an inert gas, in an environment external to the device, such as within the cavity of a tire. A hollow resonator, or standing wave tube, is coupled to the pressure sensor. The resonator has a free end exposed to the external environment to the extent that pressure variations in the fluid are propagated through the hollow resonator to the pressure sensor via the free end. The hollow resonator has a resonant frequency substantially matching a target frequency such that resonance is established in the tube at the resonant frequency in response to the presence of an audio signal in the fluid having a frequency that substantially matches the target frequency.

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Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority Dated Feb. 4, 2010 for PCT/US2009/005841.

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