Title: Rough road detection system
Application Number: 200610143373 Application Date: 2006.10.31
Publication Number: 1959353 Publication Date: 2007.05.09
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01H17/00;G01M7/00;G01M17/007;G01D1/00;G07C5/08;F02D41/00;F02D13/06;B60W40/10
Applicant(s) Name: GM Global Technology Operation Address:
Inventor(s) Name: Assaf Tameem K.;Mathews David S.;Naik Sanjeev M.
Attorney & Agent: liuhua lian
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.
Time: 4