Time based low tire pressure warning sensor

Details Time based low tire pressure warning sensor Time based low tire pressure warning sensor

1996-07-22

1998-07-21

Hofsass, Jeffery

Communications: electrical

Land vehicle alarms or indicators

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

34082569, 731463, B60C 2300

Patent

active

057839921

ABSTRACT:
A battery powered sensor in a tire has a microprocessor and a transmitter circuit permanently connected to a battery and a pressure switch or pressure sensor coupled to the microprocessor. The microprocessor has a sleep state and wakes up every few minutes to execute an algorithm which determines on a time basis whether to read the pressure state and transmit a report of significant changes, and determines on a randomly timed basis whether to transmit a status report. A factory test state permits only one signal transmission when the tire is inflated and inhibits other signals for a period to allow testing of many tires without interference from one another.

REFERENCES:
patent: 4163208 (1979-07-01), Merz
patent: 4312001 (1982-01-01), Marzolf
patent: 4316176 (1982-02-01), Gee et al.
patent: 4363020 (1982-12-01), Venema
patent: 5029468 (1991-07-01), Dosjoub
patent: 5109213 (1992-04-01), Williams
patent: 5115236 (1992-05-01), Kohler
patent: 5285189 (1994-02-01), Nowicki et al.
patent: 5289369 (1994-02-01), Hirshberg
patent: 5463374 (1995-10-01), Mendez, et al.

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