Valve having means for generating a wireless transmittable indicating signal in case of a pressure drop within vehicle tires
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United States of America Patent
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-
Jun 30, 1998
Grant Date -
N/A
app pub date -
Dec 19, 1994
filing date -
Feb 8, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A valve which includes signal generating means generate a signal representing a pressure drop within a vehicle tire. The valve includes an absolute pressure sensor coupled to measure the pressure within the tire. A microprocessor is provided which upon activation following operation of the valve stores a value of the electric pressure signal from the pressure sensor in a memory. During operation of the vehicle, the stored reference electric pressure signal is compared with periodic measurements of pressure within the tire. The transmitter is activated at periodic intervals, whenever a given ratio between the compared values and a threshold value exceeds an upper or lower limit. The system is activated by a acceleration sensor which can detect when the vehicle is moving, thus avoiding power consumption stopped.
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