Method and device for filtering information emitted by a...

Data processing: measuring – calibrating – or testing – Measurement system – Pressure

Reexamination Certificate

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Details

C702S140000, C073S146000, C340S442000

Reexamination Certificate

active

11216193

ABSTRACT:
The invention relates to a method for filtering information emitted, on the basis of pressure measurements taken by a pressure sensor mounted on a wheel of a vehicle equipped with a tire, to a central unit mounted on the vehicle. According to this method, a value representative of the pressure of the air in the tire is measured periodically, with a period θ, and from this any possible variations ΔP in pressure between the values of the pressures successively measured are deduced; in parallel, with the same period θ, a value representative of the temperature of the air in the tire is measured. In addition, when there is a variation ΔP in pressure between two measured pressure values, that is greater in terms of absolute value than a predetermined threshold Sp, the variation ΔT between the two temperature values measured at the same instants as the measured pressures is calculated. The emission of a signal representative of a variation in pressure to the central unit is commanded only if the comparative change in the pressure and in the measured temperature might be representative of a variation of the amount of air in the tire.

REFERENCES:
patent: 4893110 (1990-01-01), Herbert et al.
patent: 5900809 (1999-05-01), Herbert et al.
patent: 2003/0074961 (2003-04-01), Fischer et al.
patent: 1 270 275 (2003-01-01), None
patent: 1 384 604 (2004-01-01), None
patent: 2 680 135 (1993-02-01), None

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