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Passive tire pressure sensor and method

United States Patent

August 29, 2006
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
A surface acoustic wave device includes a micro-machined pressure transducer for monitoring tire pressure. The device is configured having a micro-machined cavity that is sealed with a flexible conductive membrane. When an external tire pressure equivalent to the cavity pressure is detected, the membrane makes contact with ridges on the backside of the surface acoustic wave device. The ridges are electrically connected to conductive fingers of the device. When the detected pressure is correct, selected fingers on the device will be grounded producing patterned acoustic reflections to an impulse RF signal. When the external tire pressure is less than the cavity reference pressure, a reduced reflected signal to the receiver results. The sensor may further be constructed so as to identify itself by a unique reflected identification pulse series.
Pfeifer; Kent Bryant (Los Lunas, NM), Williams; Robert Leslie (Albuquerque, NM), Waldschmidt; Robert Lee (Calgary, CA), Morgan; Catherine Hook (Ann Arbor, MI)
The Goodyear Tire & Rubber Company (Akron, OH)
10/ 633,774
August 4, 2003
The U.S. Government has certain rights in this invention as provided for by the terms of Contract No. DE-AC04-94AL85000 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.