Method and apparatus for detecting wheel motion in a tire pressure monitoring system
First Claim
1. An apparatus for detecting motion of a wheel comprising a tire containing, in use, fluid at a pressure, the apparatus comprising a pressure sensor arranged to measure the pressure of said fluid and to generate a signal indicating the measured fluid pressure;
- and means for detecting a component of said signal that corresponds to variations in the pressure of said fluid caused by vibrations of the tire which result from rolling contact between the tire and a ground surface, wherein, upon detection of said component of said signal, the apparatus determines that the wheel is in motion.
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Accused Products
Abstract
An apparatus for detecting motion of a wheel comprising tyre. The apparatus comprises a pressure sensor for measuring the tyre pressure and generating a signal corresponding to the measured tyre pressure, and means for detecting a component of said signal that corresponds to, or is generated by, vibrations of the tyre. Upon detection of the signal component, the apparatus determines that the wheel is in motion. The detecting means may arranged to detect an audio signal component or signal components having a frequency in the range 200 Hz to 300 Hz.
24 Citations
15 Claims
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1. An apparatus for detecting motion of a wheel comprising a tire containing, in use, fluid at a pressure, the apparatus comprising a pressure sensor arranged to measure the pressure of said fluid and to generate a signal indicating the measured fluid pressure;
- and means for detecting a component of said signal that corresponds to variations in the pressure of said fluid caused by vibrations of the tire which result from rolling contact between the tire and a ground surface, wherein, upon detection of said component of said signal, the apparatus determines that the wheel is in motion.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of detecting motion of a wheel comprising a tire containing, in use, fluid at a pressure, the method comprising measuring the pressure of said fluid;
- generating a signal indicating the measured fluid pressure;
detecting a signal component of said signal that corresponds to variations in the pressure of said fluid caused by vibrations of the tire which result from rolling contact between the tire and a ground surface; and
, upon detection of said signal component, determining that the wheel is in motion. - View Dependent Claims (12, 13)
- generating a signal indicating the measured fluid pressure;
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14. A device for monitoring fluid pressure within a tire of a wheel, the tire containing, in use, fluid at a pressure, the device comprising a pressure sensor arranged to measure the pressure of the fluid and to generate a signal indicating the measured fluid pressure;
- and an apparatus for detecting motion of the wheel, the apparatus including means for detecting a component of said signal that corresponds variations in the pressure of said fluid caused by to vibrations of the tire which result from rolling contact between the tire and a ground surface, wherein, upon detection of said component of said signal, the apparatus determines that the wheel is in motion.
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15. A computer program product stored on a computer readable medium for detecting motion of a wheel comprising a tire containing, in use, fluid at a pressure, the computer program product comprising:
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a first code for measuring the tire pressure of said fluid; a second code for generating a signal indicating the measured fluid pressure; a third code for detecting a signal component of said signal that corresponds to variations in the pressure of said fluid caused by vibrations of the tire which result from rolling contact between the tire and a ground surface; and a fourth code for determining that the wheel is in motion upon detection of said signal component.
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Specification