Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Patent
1981-06-15
1983-06-28
Woodiel, Donald O.
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
340 58, B60C 2302
Patent
active
043898840
ABSTRACT:
The present invention is a remote system for indicating tire pressure for use in combination with a pressure transducer which is disposed inside a pneumatic tire. The pneumatic tire is placed on a wheel rim. The remote system includes a ferrite rod which is mechanically coupled to the pressure transducer and which is disposed within the pneumatic tire. The remote system also includes a passive circuit including a first coil which is mechanically coupled to the wheel rim, a second coil which is electromagnetically coupled to the ferrite rod, which is slidably coupled to the second coil, and a capacitor, all of which are electrically coupled in series to form a tuned circuit which resonates at a particular frequency which is dependent on the position of the ferrite rod, and a detector which detects the change in frequency at which the first circuit resonates thereby providing a measure of movement of the ferrite rod in response to the change in pressure of the pneumatic tire. The detector includes an oscillating circuit having a coil of several turns on a rod of highly permeable material which is disposed adjacent to the first coil on the wheel rim whereby the passive circuit receives energy from the oscillating circuit. As a result of the linear movement of the ferrite rod there will be a change in the frequency at which the passive circuit resonates thereby producing a voltage across the coil of the oscillating circuit which is linearly proportional to the change of pressure in the pneumatic tire. The detector also includes an amplifier, which amplifies the voltage, of the oscillating circuit and a metering display which displays the amplified voltage.
REFERENCES:
patent: 4334428 (1982-06-01), Fima
Johansen W. Edward
Woodiel Donald O.
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