Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Patent
1979-11-13
1982-06-15
Myracle, Jerry W.
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
73129, 340 52A, 340 58, B60C 2302
Patent
active
043344283
ABSTRACT:
A circuit mounted on a rotatable wheel of a vehicle varies its resonant frequency in accordance with tire pressure or another parameter measured on the wheel. The path traveled by the resonant circuit as the wheel turns extends along a coil mounted on the adjacent non-rotatable structure of the vehicle. A magnetic field is produced by the coil when excited by a cyclically varying interrogation signal and the force field interacts with the resonant circuit to the extent that its frequency matches that circuit's resonant frequency. The combined impedance of the coil and the resonant circuit thus vary with the frequency of the interrogation signal to indicate the inflation pressure. The coil may be a ring formed by a circular array of loops each wound about an axis that extends toward the path of the resonant circuit, by one or more elongated loops or a combination of coils that produce a similarly confined and directed field.
If desired, the ring-shaped coil can be mounted on the wheel to interact with a second coil mounted on the non-rotatable structure. For maximum coupling, two ring-shaped coils can be arranged in opposition to each other, one on the wheel and the other on the non-rotatable structure. The inflation pressure can be sensed by a variable inductor connected to a piston or bellows that responds to changes in tire pressure, a fail-safe device being incorporated to prevent the escape of air from the system and to signal the failure of the system.
A provision for sensing brake wear can also be included utilizing a conductor that interacts with the brake pad to activate a circuit at a different resonant frequency.
REFERENCES:
patent: 3092806 (1963-06-01), Field
patent: 3723966 (1973-03-01), Mueller et al.
patent: 3911434 (1975-10-01), Cook
patent: 3975706 (1976-08-01), Kato
Fima Raoul G.
Mahieux Jacques E.
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