Communications: electrical – Selective – Having indication or alarm
Patent
1984-06-21
1986-05-13
Rowland, James L.
Communications: electrical
Selective
Having indication or alarm
731465, 200 6125, B60C 2300
Patent
active
045889783
ABSTRACT:
A system for monitoring vehicle tire pressure, or the like. The system includes a transmitter and a receiver mounted on the vehicle body, and magnetically coupled inductor and enhancer circuits carried on the vehicle wheel. The inductor circuit contains an open/closed condition switch which is responsive to tire pressure. The transmitter signal, acting through the inductor and enhancer circuits, produces a response voltage in the receiver which varies at a selected transmitter frequency according to the condition of the switch. In one embodiment of the invention, the inductor and enhancer circuits are tuned to enhance the response voltage in the receiver, at a selected transmitter frequency and at one inductor circuit switch condition. In a second embodiment, the inductor and enhancer circuits are tuned to produce receiver signals which have one signal-to-noise ratio peak at one transmitter frequency and with the pressure switch in one condition, and a second signal-to-noise ratio peak, at a second transmitter frequency and with the switch in its other condition.
REFERENCES:
patent: 2274557 (1942-02-01), Morgan et al.
patent: 3723966 (1973-03-01), Mueller et al.
patent: 3858174 (1974-12-01), Harris
patent: 4057783 (1977-11-01), Blanchier
patent: 4074227 (1978-02-01), Kalmus
patent: 4103283 (1978-07-01), Lee
patent: 4450431 (1984-05-01), Hochstein
Mullen Jr. Thomas J.
Rowland James L.
Transensory Devices, Inc.
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