Transponder receiver

Details Transponder receiver Transponder receiver

G - Physics

08

C

G08C 17/02 (2006.01) B60C 23/02 (2006.01) B60C 25/00 (2006.01) G01M 17/02 (2006.01) G06K 7/10 (2006.01) G06K 19/04 (2006.01) G06K 19/06 (2006.01)

Patent

CA 2356617

A transponder (tag) monitoring method (300) and apparatus (250), preferably for vehicular tire monitoring systems, which automatically changes the system's database (267, TIRE_DB) to correct the association between transponders and transponder/tire (202/204) positions (205) whenever a known tag (202) is replaced by an unknown (foreign) tag. The tags are assumed to transmit a data stream which includes a unique tag ID. The data streams detected (received) by the receiver (266) are continually monitored. If a data stream from a known tag is not seen for a TIMEOUT amount of time, then the position is labeled in the database as "REMOVED", and the tag ID associated with that tire position is nulled, thereby removing it from the list of known tags. Whenever an unknown ID is detected while any tire position is labeled as "REMOVED", it is recorded in a single field (MRR_FOREIGN_TAG_ID) which holds only the most recently received foreign tag ID. That field is monitored to time (MRR_TIMER) the length of time for which the field maintains the same foreign tag ID, and if the time exceeds a TIMEOUT value then the foreign tag ID is automatically made known by associating it with the specific tire position labeled as "REMOVED", and changing the specific tire position label from "REMOVED" to "NOT REMOVED ".

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