Valve having means for generating a wireless transmittable indicating signal in case of a pressure drop within vehicle tires
First Claim
1. A valve having signal generating means for generating a wireless transmittable indicating signal in response to a pressure drop within a vehicle tire, wherein the valve comprises a valve spud and a valve stem extending from said valve spud which provides a valve means which opens and closes during pressurization of said tire, said signal generating means mounted adjacent said valve spud comprising at least:
- an absolute-pressure sensor being coupled to the pressure within the tire and generating an electric pressure signal in accordance with the pressure within the tire;
an electronic storage means;
a transmitter means for telemetric transmission of an indicating signal in case of a pressure drop;
a microprocessor including an arithmetic-logic unit; and
an activating means coupled to said valve means for enabling the absolute-pressure sensor to generate an electric pressure signal corresponding to the actually prevailing tire pressure in response to operation of said valve means;
said electric pressure signal being stored into the electronic storage means after each operation of said valve means and is available as a reference pressure signal;
and wherein the arithmetic-logic unit;
compares an electric pressure signal generated by said absolute-pressure means with said stored reference pressure signal and generates a compare signal;
refers said compare signal to a given threshold value; and
activates said transmitter means at least then, whenever a given ratio between the threshold value and the compare signal is outside upper and lower limits.
1 Assignment
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Accused Products
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.
113 Citations
15 Claims
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1. A valve having signal generating means for generating a wireless transmittable indicating signal in response to a pressure drop within a vehicle tire, wherein the valve comprises a valve spud and a valve stem extending from said valve spud which provides a valve means which opens and closes during pressurization of said tire, said signal generating means mounted adjacent said valve spud comprising at least:
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an absolute-pressure sensor being coupled to the pressure within the tire and generating an electric pressure signal in accordance with the pressure within the tire; an electronic storage means; a transmitter means for telemetric transmission of an indicating signal in case of a pressure drop; a microprocessor including an arithmetic-logic unit; and an activating means coupled to said valve means for enabling the absolute-pressure sensor to generate an electric pressure signal corresponding to the actually prevailing tire pressure in response to operation of said valve means; said electric pressure signal being stored into the electronic storage means after each operation of said valve means and is available as a reference pressure signal; and wherein the arithmetic-logic unit; compares an electric pressure signal generated by said absolute-pressure means with said stored reference pressure signal and generates a compare signal; refers said compare signal to a given threshold value; and activates said transmitter means at least then, whenever a given ratio between the threshold value and the compare signal is outside upper and lower limits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification