System for detecting pneumatic pressure in tire

Details System for detecting pneumatic pressure in tire System for detecting pneumatic pressure in tire

1991-07-24

1993-11-16

Woodiel, Donald O.

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

73728, 340448, B60C 2302

Patent

active

052612732

ABSTRACT:
The pneumatic pressure in a tire on a wheel of a vehicle is introduced into a pressure chamber positioned at a central axis about which the tire is rotatable through a communication passage defined in the wheel. When the pneumatic pressure in the pressure chamber varies, a diaphragm or bellows attached over the pressure chamber is elastically displaced, axially moving a slide bar extending axially through a wheel shaft on which the wheel is supported. The movement of the slide bar displaces a ferromagnetic member in a coil, whose inductance then varies. The change in the coil inductance is detected by an electronic control unit, which transmits a signal to a display unit.

REFERENCES:
patent: 2239676 (1941-04-01), Henry
patent: 3977355 (1976-08-01), Lorenz et al.
patent: 4619137 (1986-10-01), Bott
patent: 4742712 (1988-05-01), Kokubu

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