Method to detect marginally large air gaps on heavy vehicle wheel speed sensor installations

摘要

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.

主权项

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; andidentifying 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.