Simple, low-cost, low-noise, and energy-efficient digital tire g

Details Simple, low-cost, low-noise, and energy-efficient digital tire g Simple, low-cost, low-noise, and energy-efficient digital tire g

1996-02-05

1997-04-29

Dougherty, Elizabeth L.

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

73723, B60C 2302, G01L 900

Patent

active

056251440

ABSTRACT:
A digital tire gauge adapted to be electrically connected to a power supply for measuring a pressure of a fluid in a tire includes, a transducing oscillator mounted in a gauge housing for transducing an imposed pressure of said fluid into a signal of a periodic sequence of cycles, and including a pressure sensor having at least one resistor having a resistance thereof which changes with imposed pressure, a capacitor electrically connected to the pressure sensor for forming therewith an oscillating circuit; and a plurality of inverters electrically connected to the capacitor and pressure sensor to provide a gain for the transducing oscillator, an isolating inverter electrically connected to the transducing oscillator, and functioning as a buffer for impedance matching of the transducing oscillator, a processor electrically connected to the buffer for generating a numerical value in response to a signal from said buffer, a display electrically connected to the processor for displaying a digital reading in accordance with the numerical value and a switch electrically connected respectively at both ends thereof to the processor and the power supply.

REFERENCES:
patent: 4250759 (1981-02-01), Vago et al.
patent: 4704901 (1987-09-01), Rocco et al.
patent: 4748845 (1988-06-01), Rocco et al.
patent: 5394343 (1995-02-01), Tsao
patent: B14250759 (1989-12-01), Vago et al.

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