Circuit for use in the detection of the condition of an isolated

Details Circuit for use in the detection of the condition of an isolated Circuit for use in the detection of the condition of an isolated

1980-08-26

1982-09-21

Robinson, Thomas A.

Communications: electrical

Selective

Having indication or alarm

731465, 200 6122, 324239, 331 47, 331 64, 331112, 331117FE, 340646, B60C 2302, G08B 2100

Patent

active

043509711

ABSTRACT:
A tire pressure monitoring system includes a tuned circuit with a pressure sensitive switch which is closed when the tire pressure is normal, connected across it, the tuned circuit and switch being mounted on the vehicle wheel. Mounted on a part of the vehicle is a detector circuit including an oscillator which includes an inductor which is at least intermittently coupled to the inductor of the tuned circuit. When the switch is closed the oscillator runs normally and its output is detected to indicate that all is well. When switch is open, however, the oscillator output is suppressed whenever the inductors are coupled together. The circuit can also be used in other applications where it is required to detect the state of an isolated switch.

REFERENCES:
patent: 2894246 (1959-07-01), DeGraffenried
patent: 3092806 (1963-06-01), Field
patent: 3374460 (1968-03-01), Massoubre
patent: 3602884 (1971-08-01), Brumbelow
patent: 3614732 (1971-10-01), Lejeune
patent: 3656137 (1972-04-01), Ratz
patent: 3665387 (1972-05-01), Enabnit
patent: 3806828 (1974-04-01), Johnson
patent: 3831161 (1974-08-01), Enabnit
patent: 4072926 (1978-02-01), Shimahara et al.
patent: 4087800 (1978-05-01), Lee

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