A valve having means for generating a wireless transmittable...

B - Operations – Transporting – 60 – C

Patent

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B60C 23/04 (2006.01) B60C 23/00 (2006.01)

Patent

CA 2117784

A valve which includes signal generating means for generating a signal representing a pressure drop occurring 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 a lower limit. The system is activated by an acceleration sensor which can detect when the vehicle is moving, thus avoiding power consumption when the vehicle is stopped.

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