Passive pick-up device for monitoring the state of the tire of a

Details Passive pick-up device for monitoring the state of the tire of a Passive pick-up device for monitoring the state of the tire of a

1991-11-19

1993-07-27

Ng, Jin F.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340442, 340445, 340447, 731465, 116 34R, B60C 2300

Patent

active

052313913

ABSTRACT:
A device for monitoring the state of the tire of a vehicle wheel and for measuring the rotation characteristics of the wheel is described herein. The device includes a rotating encoder element constituted by a multipolar magnetic ring, whereby magnetic segments of different polarity are distributed circumferentially in a regular and alternating manner. The device further includes a transmitter coil mounted coaxially with the multipolar ring, a fixed pick-up element constituted by an induction coil enclosed in a U-shaped section of an annular flux focusing element arranged coaxially with the multipolar magnetic ring. The device is energized by an alternative electric current flowing through the transmitting coil which generates a magnetic field superimposed on the magnetic field created by the multipolar magnetic ring, wherein the pick-up element delivers a signal relating to the rotation characteristics of the wheel and the state of the tire.

REFERENCES:
patent: 3895347 (1975-07-01), Takusugawa et al.
patent: 4048614 (1977-09-01), Shumway
patent: 4238955 (1980-12-01), Reinecke
patent: 4334428 (1982-06-01), Fima et al.
patent: 4742857 (1978-05-01), Gandhi
patent: 4749993 (1988-06-01), Szabo et al.
patent: 4818939 (1989-04-01), Takahashi et al.
patent: 4891973 (1990-01-01), Bollender et al.
J. Mayfield, "Cockpit Display of Aircraft Tire Pressure", Aviation Week & Space Technology, May 7, 1979, New York, USA, pp. 46, 47, 49, 51 and 54.

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