Tire pressure detecting apparatus for vehicle

Details Tire pressure detecting apparatus for vehicle Tire pressure detecting apparatus for vehicle

1991-04-05

1993-11-09

Peng, John K.

Communications: electrical

Land vehicle alarms or indicators

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

340444, 340445, 340449, 731465, 116 34R, 200 6122, B60C 2300

Patent

active

052606830

ABSTRACT:
A tire pressure detecting portion includes a housing, provided within the tire, within which a piezoelectric element is provided so as to be deformed by the tire pressure. The capacitance of said piezoelectric element is changed in accordance with its deformation. The piezoelectric element is electrically connected with a first coil diposed within said tire. The first coil is electromagnetically coupled with an excitation coil and a receiving coil, both of which are provided in the vehicle. The excitation coil provides an excitation voltage whole frequency is changed within a predetermined range including a resonant frequency. When the received voltage has the resonant frequency, a correspondinq tire pressure is determined based on a data map showing the relationship between said resonant frequency and the tire pressure.

REFERENCES:
patent: 3858174 (1974-12-01), Harris
patent: 3881170 (1975-04-01), Hosaka et al.
patent: 3911434 (1975-10-01), Cook
patent: 4057783 (1977-11-01), Blanchier
patent: 4450431 (1984-05-01), Hochstein
patent: 4567459 (1986-01-01), Folger
patent: 5006844 (1991-04-01), Ohta et al.
Automotive Electronic News, "BMW Chooses Michelin Tire Pressure Monitor".
An Advertisement by Michelin "M. T. M. Elektronische Luftdruck-Uberwachung".
Jidokagijutsu, vol. 14, "Pressure Sensor Utilizing Piezo Ceramic".

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