Determining the air permeability of a tire
First Claim
1. An apparatus for determining the fluid pressure in a tire, said apparatus comprising:
- means for mounting the tire in an inflated condition;
tire pressure sensing means in fluid communication with the interior of the inflated tire for sensing the fluid pressure in the tire and for generating an electrical signal in proportion to the fluid pressure sensed in the tire;
temperature sensing means adapted for attachment to said mounting means for sensing the temperature adjacent the tire and for generating an electrical signal in proportion to the temperature sensed adjacent the tire;
data acquisition means in electrical communication with said tire pressure sensing means and said temperature sensing means for receiving the electrical signals generated by said respective sensing means at a substantially simultaneous time and for converting the electrical signals to digital information; and
computer means in electrical communication with said data acquisition means for receiving the digital information and for calculating a value representative of a corrected pressure in the tire as a function of the digital information.
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Accused Products
Abstract
Determining the rate of change of fluid pressure in a tire comprises mounting the tire in an inflated condition. A tire pressure sensor senses fluid pressure in the tire and generates an electrical signal in proportion to the fluid pressure sensed in the tire. A temperature sensor senses the temperature adjacent the tire and generates an electrical signal in proportion to the temperature sensed adjacent the tire. A data acquisition system is in electrical communication with the sensors. The data acquisition system receives the electrical signals from the respective sensors at a substantially simulatneously time and converts the electrical signals into digital information. An electronic digital computer is an electrical communication with the data acquisition system for receiving the digital information and for calculating a value representative of a corrected pressure in the tire as a function of the digital information received. A plurality of the corrected pressure values are stored. The stored corrected pressure values are linearized to provide another value indicative of the rate of change of pressure in the tire.
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Citations
27 Claims
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1. An apparatus for determining the fluid pressure in a tire, said apparatus comprising:
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means for mounting the tire in an inflated condition; tire pressure sensing means in fluid communication with the interior of the inflated tire for sensing the fluid pressure in the tire and for generating an electrical signal in proportion to the fluid pressure sensed in the tire; temperature sensing means adapted for attachment to said mounting means for sensing the temperature adjacent the tire and for generating an electrical signal in proportion to the temperature sensed adjacent the tire; data acquisition means in electrical communication with said tire pressure sensing means and said temperature sensing means for receiving the electrical signals generated by said respective sensing means at a substantially simultaneous time and for converting the electrical signals to digital information; and computer means in electrical communication with said data acquisition means for receiving the digital information and for calculating a value representative of a corrected pressure in the tire as a function of the digital information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining the air permeability of a tire, said method comprising the steps of:
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mounting the tire in an inflated condition; placing the tire in a temperature controlled enclosure; sensing the pressure in the tire and generating an electrical signal as a function of the pressure sensed in the tire; sensing the temperature adjacent the tire and generating an electrical signal as a function of the temperature sensed adjacent the tire; receiving the electrical signals generated in each of said sensing steps and converting the signals to digital information; computing a value representative of a corrected pressure in the tire as a function of the digital information; storing a plurality of the values; and calculating a linearized value as a function of the plurality of values representative of the rate of change of corrected pressure in the tire which is indicative of the premeability of the tire. - View Dependent Claims (10, 11, 12)
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13. An apparatus for determining the air permeability of a tire, said apparatus comprising:
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means for mounting the tire in an inflated condition; tire pressure sensing means in fluid communication with the interior of the inflated tire for sensing the fluid pressure in the tire and for generating an electrical signal in proportion to the fluid pressure sensed in the tire; temperature sensing means adapted for attachment to said mounting means for sensing the temperature adjacent the tire and for generating an electrical signal in proportion to the temperature sensed adjacent the tire; data acquisition means in electrical communication with said tire pressure sensing means and said temperature sensing means for receiving the electrical signals generated by said respective sensing means at a substantially simultaneous time and for converting the electrical signals to digital information; computer means in electrical communication with said data acquisition means for receiving the digital information and for calculating a value representative of a corrected pressure in the tire as a function of the digital information; storage means for storing a plurality of values representative of corrected pressure in the tire; and
first program means to linearize the plurality of values to provide another value representative of the rate of change of pressure in the tire. - View Dependent Claims (14, 15, 16)
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17. An apparatus for determining fluid pressure in an inflated article, said apparatus comprising:
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first sensing means in fluid communication with the interior of the article for sensing fluid pressure in the article and for generating a signal in proportion to the absolute fluid pressure within the article, said first sensing means comprising a nonvented pressure transducer; second sensing means for sensing at least one condition adjacent the exterior of the article and for generating a signal in proportion to the condition sensed, said second sensing means comprising a thermocouple; means for acquiring the signals from said first and second sensing means; and means for calculating a value representative of a corrected fluid pressure in the article as a function of the signals acquired from said first and second sensing means. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A method of determining fluid pressure in a pressurized article, said method comprising the steps of:
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sensing the fluid pressure in the article and generating an electrical signal in proportion to the pressure sensed in the article; sensing the temperature adjacent the article and generating an electrical signal in proportion to the temperature sensed adjacent the article; acquiring the electrical signals generated in each of said sensing steps; computing a value representative of a fluid pressure in the article as a function of the electrical signals acquired; storing a plurality of the values computed in said computing step; and calculating the rate of change in corrected pressure in the article as a function of the plurality of values. - View Dependent Claims (26, 27)
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Specification