Method to detect marginally large air gaps on heavy vehicle wheel speed sensor installations
First Claim
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1. A method for performing an all-wheel marginally large airgap test (AWMLAT), comprising:
- upon test initiation, receiving a signal from each of a plurality of wheel speed sensors on a vehicle, the signal being indicative of a exciter ring sensed by the sensor;
for each wheel speed sensor;
monitoring exciter ring frequency to determine whether exciter ring frequency is within a predetermined frequency range;
when exciter ring frequency is within the predetermined frequency range, measuring wheel speed sensor signal peak amplitude;
comparing the measured wheel speed sensor signal peak amplitude to a predetermined minimum amplitude that represents the maximum allowable airgap between the wheel speed sensor and the exciter ring; and
identifying wheel ends for which the wheel speed sensor signal peak amplitude is less than the predetermined minimum amplitude as having an airgap that is larger than a predetermined acceptable airgap size.
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Accused Products
Abstract
When detecting unacceptably large airgaps between wheel speed sensors and their exciter rings on wheel ends of a vehicle, wheel speed sensor output is filtered and monitored to detect signal amplitudes that correspond to the airgaps. When signal peak amplitude below a predetermined threshold is detected, the airgap is too large. Wheel ends having unacceptably large air gaps are indicated to the driver or technician via blink sequences (e.g., on an electronic stability program (ESP) indicator light or other suitable indicator), wherein each wheel end is associated with a unique blink sequence.
10 Citations
28 Claims
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1. A method for performing an all-wheel marginally large airgap test (AWMLAT), comprising:
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upon test initiation, receiving a signal from each of a plurality of wheel speed sensors on a vehicle, the signal being indicative of a exciter ring sensed by the sensor; for each wheel speed sensor; monitoring exciter ring frequency to determine whether exciter ring frequency is within a predetermined frequency range; when exciter ring frequency is within the predetermined frequency range, measuring wheel speed sensor signal peak amplitude; comparing the measured wheel speed sensor signal peak amplitude to a predetermined minimum amplitude that represents the maximum allowable airgap between the wheel speed sensor and the exciter ring; and identifying wheel ends for which the wheel speed sensor signal peak amplitude is less than the predetermined minimum amplitude as having an airgap that is larger than a predetermined acceptable airgap size. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A processor that executes an all-wheel marginally large airgap test (AWMLAT), wherein the processor is configured to:
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upon test initiation, receive a signal from each of a plurality of wheel speed sensors on a vehicle, the signal being indicative of a exciter ring sensed by the sensor; and for each wheel speed sensor; monitor exciter ring frequency to determine whether exciter ring frequency is within a predetermined frequency range; when exciter ring frequency is within the predetermined frequency range, measure wheel speed sensor signal peak amplitude; compare the measured wheel speed sensor signal peak amplitude to a predetermined minimum amplitude that represents the maximum allowable airgap between the wheel speed sensor and the exciter ring; and identify wheel ends for which the wheel speed sensor signal amplitude is less than the predetermined minimum amplitude as having an airgap that is larger than a predetermined acceptable airgap size. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A system that facilitates performing an all-wheel marginally large airgap test (AWMLAT), comprising:
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an antilock brake system comprising a plurality of wheel speed sensors that respectively monitor a plurality of exciter rings; and an indicator light; and a processor configured to, upon test initiation, receive a signal from each of a plurality of wheel speed sensors on a vehicle, the signal being indicative of a exciter ring sensed by the sensor; wherein the processor is further configured to, for each wheel speed sensor; monitor exciter ring frequency to determine whether exciter ring frequency is within a predetermined frequency range; when exciter ring frequency is within the predetermined frequency range, measure wheel speed sensor signal peak amplitude; compare the measured wheel speed sensor signal peak amplitude to a predetermined minimum amplitude that represents the maximum allowable airgap between the wheel speed sensor and the exciter ring; and identify wheel ends for which the wheel speed sensor signal peak amplitude is less than the predetermined minimum amplitude as having an airgap that is larger than a predetermined acceptable airgap size. - View Dependent Claims (19, 20, 21, 22, 23)
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24. An apparatus that facilitates performing an all-wheel marginally large airgap test (AWMLAT), comprising:
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receiving means for receiving a signal from each of a plurality of wheel speed sensors on a vehicle, the signal being indicative of a exciter ring sensed by the sensor; and for each wheel speed sensor; monitoring means for monitoring exciter ring frequency to determine whether exciter ring frequency is within a predetermined frequency range; measuring means for, when exciter ring frequency is within the predetermined frequency range, measuring wheel speed sensor signal peak amplitude; comparing means for comparing the measured wheel speed sensor signal amplitude to a predetermined minimum peak amplitude that represents the maximum allowable airgap between the wheel speed sensor and the exciter ring; and identifying means for identifying wheel ends for which the wheel speed sensor signal amplitude is less than the predetermined minimum peak amplitude as having an airgap that is larger than a predetermined acceptable airgap size.
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25. A method for performing wheel-end marginally large airgap test (WEMLAT), comprising for each wheel on a vehicle:
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spinning a roller under the wheel for a predetermined number of revolutions within a preset speed range; measuring wheel speed sensor output during spinning; requesting status and results for all wheels; receiving status and result data; checking a predetermined status byte in the received data to determine the status of an airgap between the wheel speed sensor and an exciter ring coupled to the first wheel; and outputting to a user an indication of any wheels having an airgap that is larger than a predetermined allowable airgap threshold size. - View Dependent Claims (26, 27, 28)
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Specification