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:
Nov. 11, 1997
Filed:
Aug. 22, 1995
Giorgio Rizzoni, Upper Arlington, OH (US);
The Ohio State University, Columbus, OH (US);
Abstract
An ignition voltage analysis is performed to provide a combustion diagnosis. A first set of characteristic parameters are provided relating a plurality of spark plug voltage, current or gap impedance waveform signals to a plurality of combustion quality measures. A spark plug voltage, current or gap impedance waveform signal is sampled in real time during a first combustion process. A second set of characteristic parameters are then generated based upon the sampled first spark plug voltage waveform signal. The combustion process is classified as a one of a knocking combustion event, a normal combustion event, a slow burn event, a partial burn event, and a misfire event. The spark plug voltage, current or gap impedance waveform signals are classified according to a statistical closeness to parameters generated by a testing engine operated in each of the above operating modes. The sampled ignition voltage signals are correlated with combustion performance indices for use in practical in-vehicle implementation for feedback control, engine monitoring, or the like.