Tire pressure monitor

Details Tire pressure monitor Tire pressure monitor

1977-02-15

1978-02-07

Waring, Alvin H.

Communications: electrical

Selective

Having indication or alarm

340253Y, B60C 2302

Patent

active

040729273

ABSTRACT:
Low pressure in a vehicle tire is detected by a system including an electronic circuit which activates a warning light in response to momentary phase shift between two cyclic signals. The system includes an oscillator which produces the first of the two cyclic signals, a parallel resonant circuit excited by the first signal and producing the second of the two cyclic signals, a coil mounted to rotate with the tire and to pass through an electromagnetic field produced by an inductor in the resonant circuit and operative to momentarily shift the phase of the second signal relative to the phase of the first signal when a pressure operated switch in the tire closes and shorts the coil, a detector which produces an output signal that momentarily changes in response to the momentary phase shift, and a warning light that is activated in response to the momentary change in the output signal.

REFERENCES:
patent: 2894246 (1959-07-01), De Graffenried

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