Method of operating tire pressure signalling devices on wheels fitted with pneumatic tires
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United States of America Patent
Stats
-
Oct 12, 1999
Grant Date -
N/A
app pub date -
Aug 6, 1998
filing date -
Dec 12, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method for operating devices on wheels having pneumatic tires to signal the tire pressure, i.e. the air pressure in the pneumatic tire, in which a pressure sensor measures the tire pressure at regular intervals, and an analysis circuit compares the tire pressure readings with a reference pressure and, in the event of deviations of the tire pressure reading from the reference pressure which exceed a threshold value .DELTA.p, transmits by radio, to an indicating device arranged separately from the wheel, a signal reporting the deviation, such that the device meets its energy needs from an electrical battery. Radio operation is discontinued as long as the pressure measured by the pressure sensor is below a preselected second pressure threshold, in particular a preselected absolute pressure value.
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