Acceleration detection and angular position determination systems and methods in tire pressure monitoring systems
First Claim
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1. A method comprising:
- estimating an oscillation frequency from an acceleration signal sample from a sensor in a tire pressure monitoring system (TPMS) wheel module to determine a sampling period;
acquiring a plurality of acceleration signal samples from the sensor according to the sampling period; and
determining a final oscillation frequency estimate and a phase angle estimate from the plurality of acceleration signal samples.
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Abstract
Embodiments relate to tire pressure monitoring systems (TPMS). In embodiments, a TPMS comprises a wheel unit and a control unit. Each wheel unit collects acceleration data and uses that data to determine a time at which the wheel unit will be at an angular position desired for signal transmission. Embodiments also include systems and methods for detecting vehicle acceleration by wheel units and determining robustness of acceleration data with respect to noise and vehicle acceleration.
38 Citations
25 Claims
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1. A method comprising:
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estimating an oscillation frequency from an acceleration signal sample from a sensor in a tire pressure monitoring system (TPMS) wheel module to determine a sampling period; acquiring a plurality of acceleration signal samples from the sensor according to the sampling period; and determining a final oscillation frequency estimate and a phase angle estimate from the plurality of acceleration signal samples. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A wheel unit of a tire pressure monitoring system comprising:
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a pressure sensor; an acceleration sensor; and a microcontroller coupled to the pressure and acceleration sensors and configured to determine a sampling period for the acceleration sensor from a single acceleration sensor signal sample, sample the acceleration sensor according to the sampling period to obtain a plurality of acceleration sensor signal samples and estimate an angular position of the wheel unit from the plurality of acceleration sensor signal samples. - View Dependent Claims (21, 22, 23, 24)
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25. A tire pressure monitoring system comprising:
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at least one wheel unit mounted in a tire of a vehicle and comprising a pressure sensor, an acceleration sensor, a microcontroller coupled to the pressure and acceleration sensors and configured to determine a sampling period for the acceleration sensor from a single acceleration sensor signal sample, sample the acceleration sensor according to the sampling period to obtain a plurality of acceleration sensor signal samples and estimate an angular position of the wheel unit from the plurality of acceleration sensor signal samples, and a communications unit configured to communicate data comprising pressure sensor data signals from the wheel unit at a transmission time corresponding to a desired transmission angle extrapolated from the estimated angular position; and a central receiver unit mounted in the vehicle and configured to receive the data communicated by the at least one wheel unit.
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Specification