Tire and suspension warning and monitoring system
First Claim
1. A method for tire and suspension warning and monitoring system for monitoring tire imbalance of a tire attached to a vehicle wheel comprising:
- sensing at least one acceleration of the wheel to provide acceleration signals;
collecting a predetermined number of acceleration signal samples;
transforming and normalizing the samples;
computing a rotational frequency of the wheel from the normalized samples;
computing a second harmonic frequency of the rotational frequency of the wheel;
summing frequency components around the second harmonic frequency;
comparing summed frequency components with a previously stored baseline value; and
outputting a signal indicative of the comparison result.
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Accused Products
Abstract
A tire and suspension monitoring and warning system consisting of a set of multi-function sensors that monitor and warn of a failure mode. The system monitors and warns for tire imbalance, tire tread wear, and shock absorbers for a tire attached to a vehicle. The monitoring and warning system includes one axial, radial, and lateral acceleration measurement of the wheel to provide acceleration signal sample power. For tire imbalance, signal sample power in the second harmonic of the tire rotational frequency is compared to that of the first harmonic. For tire tread wear, average signal sample power within a second frequency range is compared to a previously stored baseline value. For shock absorber performance, a sum of all frequency components in a second predetermined frequency range is compared to a baseline value.
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Citations
55 Claims
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1. A method for tire and suspension warning and monitoring system for monitoring tire imbalance of a tire attached to a vehicle wheel comprising:
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sensing at least one acceleration of the wheel to provide acceleration signals;
collecting a predetermined number of acceleration signal samples;
transforming and normalizing the samples;
computing a rotational frequency of the wheel from the normalized samples;
computing a second harmonic frequency of the rotational frequency of the wheel;
summing frequency components around the second harmonic frequency;
comparing summed frequency components with a previously stored baseline value; and
outputting a signal indicative of the comparison result. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for tire and suspension warning and monitoring system for monitoring tire imbalance of a tire attached to a vehicle wheel, the apparatus comprising:
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a sensor for sensing at least one acceleration of the wheel and for providing acceleration signals corresponding thereto;
a collector for collecting a predetermined number of acceleration signals samples;
a transformer and normalizer for transforming and normalizing the samples within a first predetermined frequency range;
a first calculator for calculating a rotational frequency of the wheel from the transformed and normalized samples;
a second calculator for calculating a second harmonic frequency of the wheel from the calculated rotational frequency of the wheel;
a comparator for comparing the second harmonic frequency with a previously stored baseline value; and
an output circuit for outputting a signal indicative of the comparison results of the comparator. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 36, 38, 39, 40, 41, 42, 43, 44, 45, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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17. A method for tire and suspension warning and monitoring system for monitoring tire tread wear of a tire attached to a vehicle wheel, the method comprising:
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sensing at least one acceleration of the wheel to provide acceleration signals;
collecting a predetermined number of acceleration signal samples;
transforming and normalizing the samples within a first predetermined frequency range;
averaging the transformed and normalized samples within a second predetermined frequency range;
comparing the averaged samples with a previously stored baseline value; and
outputting a signal indicative of the comparison result.
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27. An apparatus for tire and suspension monitoring and warning system for monitoring tire tread wear of a tire attached to a vehicle wheel, the apparatus comprising:
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a sensor for sensing at least one acceleration of the wheel and for providing acceleration signals corresponding thereto;
a collector for collecting a predetermined number of acceleration signals samples;
a transformer and normalizer for transforming and normalizing the samples within a first predetermined frequency range;
an averager for averaging the transformed and normalized samples within a second predetermined frequency range;
a comparator for comparing the averaged samples with a previously stored baseline value; and
an output circuit for outputting a signal indicative of the comparison results of the comparator.
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37. A tire and suspension warning and monitoring system for monitoring shock absorber performance of a shock absorber attached to a vehicle wheel, the method comprising:
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sensing at least one acceleration of the wheel to provide acceleration signals;
collecting a predetermined number of acceleration signal samples;
transforming and normalizing the collected samples within a first predetermined frequency range;
summing the transformed and normalized samples within a second predetermined frequency range;
comparing the summed samples with a previously stored baseline value; and
outputting a signal indicative of the comparison result.
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46. An apparatus for a tire and suspension warning and monitoring system for monitoring shock absorber performance of a shock absorber attached to a vehicle wheel, the apparatus comprising:
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a sensor for sensing at least one acceleration of the wheel and for providing acceleration signals corresponding thereto;
a collector for collecting a predetermined number of acceleration signals samples;
a transformer and normalizer for transforming and normalizing the samples within a first predetermined frequency range;
a summer for summing the transformed and normalized samples within a second predetermined frequency range;
a comparator for comparing the summed samples with a previously stored baseline value; and
an output circuit for outputting a signal indicative of the comparison results of the comparator.
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Specification