Detection of a low pressure condition of a vehicle tire

Details Detection of a low pressure condition of a vehicle tire Detection of a low pressure condition of a vehicle tire

1984-06-26

1986-04-01

Woodiel, Donald O.

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

340 58, B60C 2302

Patent

active

045789924

ABSTRACT:
A tire pressure indicating device includes a coil, and mounted in a tire forming with a capacitor to form a passive oscillatory circuit. The circuit is energized by pulses supplied via a coil positioned outside the tire and secured to the vehicle and the frequency in the passive oscillatory circuit is varied with tire pressure due to changes caused to the capacitance value of the capacitor. The frequency in the passive oscillatory circuit is sensed via a coil positioned outside the tire and secured to the vehicle.

REFERENCES:
patent: 3662335 (1972-05-01), Fritze
patent: 4467641 (1984-08-01), Abraham
patent: 4529961 (1985-07-01), Nishimura et al.

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