Motion sensing for tire pressure monitoring

Measuring and testing – Tire – tread or roadway – Tire inflation testing installation

Reexamination Certificate

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C073S146300, C073S756000

Reexamination Certificate

active

07040154

ABSTRACT:
A motion sensor system for a tire pressure monitoring system (TPMS) that uses a piezoelectric sensor to sense vibration as an indication of wheel motion. The TPMS uses the detected vibration to transition between operation modes. In one embodiment, the TPMS has a motion mode and a park mode, wherein the TPMS has increased activity (e.g. sampling tire pressure at a higher rate and transmitting tire pressure at a higher rate) during the motion mode than in the park mode.

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Mark L. Shaw, “Motion Sensing Techniques and Analysis for Direct Tire Pressure Monitoring,” Society of Automotive Engineers, Inc., Sensor Products Division, TSPG, SPS, MOTOROLA, Inc., pp. 1-9 (2003).
Mark L. Shaw, “Considerations to Improve Battery Life in Direct Tire Pressure Monitoring,” Society of Automotive Engineers, Inc., Sensor Products Division, TSPG, SPS, Motorola, Inc., 10 pgs, (2002).

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