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Diagnostic for two-mode variable valve activation device

United States Patent

January 7, 2014
View the Complete Patent at the US Patent & Trademark Office
A method is provided for diagnosing a multi-mode valve train device which selectively provides high lift and low lift to a combustion valve of an internal combustion engine having a camshaft phaser actuated by an electric motor. The method includes applying a variable electric current to the electric motor to achieve a desired camshaft phaser operational mode and commanding the multi-mode valve train device to a desired valve train device operational mode selected from a high lift mode and a low lift mode. The method also includes monitoring the variable electric current and calculating a first characteristic of the parameter. The method also includes comparing the calculated first characteristic against a predetermined value of the first characteristic measured when the multi-mode valve train device is known to be in the desired valve train device operational mode.
Fedewa; Andrew M. (Clarkston, MI)
Delphi Technologies, Inc. (Troy, MI)
13/ 315,566
December 9, 2011
GOVERNMENT-SPONSORED STATEMENT This invention was made with the United States Government support under Contract DE-EE0003258 awarded by the U.S. Department of Energy. The Government has certain rights in this invention.