Motorola Corporation

Continental Automotive Systems Corporation

Temic Automotive of North America, Inc.

Richard John Gilbert

Marvin L Lynch

Ningsheng Qiao

Jeffrey D Naber

Alan J Chewter

Donald Peter Kultgen

Louis Yizhang Liu

Keith Gerlach

Hanlong Yang

Ninsheng Qiao

Jack Szpytman

Louis Liu

A method and system for determining combustion and harmonic noise correction factors for current operating conditions corresponding to the actual vehicle and applying the combustion and harmonic noise correction factors to a sensor signal, thereby removing engine combustion and harmonic noise from the sensor signal and leaving a misfire data signal in the sensor signal.

Method to reduce engine combustion and harmonic noise for misfire detection

A method for determining a misfire condition includes receiving crankshaft acceleration data. The method further includes routing the received data through at least one of a plurality of processing paths and through a startup path and determining a crankshaft revolution count. The method further includes comparing the determined crankshaft accelerations over the determined revolution count to at least one threshold crankshaft acceleration value over the determined revolution count and determining a misfire condition from one of the startup path and the processing path based on the comparison.

Method and system for misfire detection

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.

Misfire detection in an internal combustion engine

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Livonia, MI, United States of America

Richard John Gilbert