Method and device for diagnosing at least one gas exchange...

Measuring and testing – Internal combustion engine or related engine system or... – Testing of an individual engine part

Reexamination Certificate

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Reexamination Certificate

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07930933

ABSTRACT:
A method and a device for the diagnosis of at least one gas exchange valve of at least one cylinder of an internal combustion engine that is on the one hand reliable and on the other hand does without additional sensor equipment are described. In a first operating state of the internal combustion engine, at least one gas exchange valve of the at least one cylinder is activated. In a second operating state of the internal combustion engine, all the gas exchange valves of the at least one cylinder are deactivated and therewith closed in stationary fashion. Sound waves produced by the internal combustion engine are acquired. It is checked whether a significant change occurs in a quantity characterizing the acquired sound waves upon a transition from the first operating state to the second operating state. In this case, an erroneous opening of the at least one gas exchange valve is recognized.

REFERENCES:
patent: 2004/0083049 (2004-04-01), Fuchs
patent: 2006/0151223 (2006-07-01), Knoll
patent: 2010/0106393 (2010-04-01), Sgatti et al.
patent: 10 2005 049 777 (2007-04-01), None

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