Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1995-05-08
1997-08-12
Hofsass, Jeffrey
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340445, 731465, B60C 2300
Patent
active
056569939
ABSTRACT:
A tire monitor includes a pressure sensor, a temperature sensor, an A/D converter, and a microprocessor. The microprocessor has a sleep mode for conserving power and an output of the microprocessor controls the power applied to the pressure sensor and to the temperature sensor. A modulator and antenna are coupled to the microprocessor for transmitting data from the tire. Coupling between a monitor and a receiver is enhanced by extending a receiving antenna downwardly from the chassis of the vehicle, e.g. from the frame of a tractor.
The tire monitor is fabricated on a small printed circuit board with terminals for programming or encoding each monitor with a unique identification code during manufacture of the monitor. Terminals are also provided for disabling the transmitter with a jumper until the monitor is installed in a tire. The jumper is removed upon installation but the transmitter is further prevented by the microprocessor from transmitting until the pressure in a tire first exceeds a predetermined pressure. Transmissions occur at widely spaced intervals and the spacing depends on the content of the data. The number of times that the data is repeated within a transmission is also a function of the content of the data.
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patent: 5473938 (1995-12-01), Handfield et al.
Ghannam Mohammed R.
Hofsass Jeffrey
Semisystems, Inc.
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