Rough road detection system

Details Rough road detection system Rough road detection system

2007-07-10

2007-07-10

McCall, Eric S. (Department: 2855)

Measuring and testing

Surface and cutting edge testing

Roughness

C073S117020

Reexamination Certificate

active

11263174

ABSTRACT:
A rough road detection system includes a collection module, a statistical module, and a comparison module. The collection module collects samples from a vibration sensitive signal. The statistical module removes a periodic anomaly from the samples and removes a random anomaly from the samples with a filter having a filter coefficient based on an engine speed signal. In addition, the statistical module calculates a statistical signal based on the samples. The rough road detection system also includes a derivative module that calculates a first and second derivative based on a rate or time. The derivative module removes negative derivatives when the derivatives are calculated with respect to the rate and positive derivatives when the derivatives are calculated with respect to time. The comparison module determines whether a rough road condition exists based on the statistical signal or the first and second derivatives.

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