The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 26, 2005
Filed:
Aug. 08, 2003
Louis Yizhang Liu, Troy, MI (US);
Richard J. Gilbert, Livonia, MI (US);
Donald P. Kultgen, Livonia, MI (US);
Jeffrey D. Naber, Dearborn, MI (US);
Hanlong Yang, Northville, MI (US);
Louis Yizhang Liu, Troy, MI (US);
Richard J. Gilbert, Livonia, MI (US);
Donald P. Kultgen, Livonia, MI (US);
Jeffrey D. Naber, Dearborn, MI (US);
Hanlong Yang, Northville, MI (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method and system for a misfire detection acquires () a series of acceleration data () representative of acceleration behavior of an engine. The data is sampled () to obtain acceleration data samples at a rate sufficient to obtain up to fourth-order perturbations of the data. The samples are filtered () to provide bandwidth limited samples, which are provided to at least two channels (). The samples are pattern matched () in a first channel to enhance harmonic phenomena and pattern canceled () in a second channel to enhance random phenomena. Hard and random misfires are detected () dependent on a magnitude of the filtered acceleration data samples. Preferably, a third channel () is added to detect multiple misfires.