Method and apparatus for detecting leakage rate in a tire pressure monitoring system
First Claim
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1. A method for determining an excessive air leakage rate in a tire of a vehicle with a tire pressure monitoring system comprising:
- determining a starting tire pressure of a tire of a vehicle at a first time;
determining a starting tire temperature of said tire at approximately said first time;
determining a current tire pressure of said tire at a second time;
determining a current tire temperature of said tire at approximately said second time;
determining a time lapse between said first time and said second time;
calculating a tire leakage rate of said tire based on said starting tire pressure, said starting tire temperature, said current tire pressure, said current tire temperature, and said time lapse.
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Abstract
A tire pressure monitoring system for a vehicle has been disclosed that can detect an excessive leakage rate of a tire. The system utilizes the starting pressure and starting temperature of a tire and the current pressure and current temperature of that tire with the time lapsed to determine the leakage rate of the tire. This leakage rate is compared to a leakage rate threshold. If the leakage rate is greater than the leakage rate threshold, an excessive leakage rate alert is generated.
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Citations
22 Claims
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1. A method for determining an excessive air leakage rate in a tire of a vehicle with a tire pressure monitoring system comprising:
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determining a starting tire pressure of a tire of a vehicle at a first time;
determining a starting tire temperature of said tire at approximately said first time;
determining a current tire pressure of said tire at a second time;
determining a current tire temperature of said tire at approximately said second time;
determining a time lapse between said first time and said second time;
calculating a tire leakage rate of said tire based on said starting tire pressure, said starting tire temperature, said current tire pressure, said current tire temperature, and said time lapse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for determining an excessive air leakage rate in a tire of a vehicle in a tire pressure monitoring system comprising:
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a tire temperature sensor, said tire temperature sensor being capable of determining a starting tire temperature of a tire of a vehicle at a first time and a current tire temperature of said tire at a second time;
a tire pressure sensor, said tire pressure sensor being capable of determining a starting tire pressure of said tire at approximately said first time and a current tire pressure of said tire at approximately said second time;
a clock timer, said clock timer being capable of determining a time lapse between said first time and said second time; and
a processor, said processor being capable of calculating a tire leakage rate of said tire based on said starting tire pressure, said starting tire temperature, said current tire pressure, said current tire temperature, and said time lapse. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification