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:
May. 23, 2006
Filed:
Apr. 25, 2005
James Craig Smith, Farmington Hills, MI (US);
Jon C. Darrow, New Hudson, MI (US);
James Craig Smith, Farmington Hills, MI (US);
Jon C. Darrow, New Hudson, MI (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
A method and system for monitoring performance of an internal combustion engine equipped with individually actuated valve control mechanisms, such as a two-step finger-follower rocker-arm assembly, using a strategy that identifies cylinder-to-cylinder variations, is disclosed. The method and system preferably include monitoring engine operating conditions, based upon input from an exhaust gas sensor and engine sensors, and determining an engine operating point. Individual cylinder fueling modifiers are determined, each corresponding to one of the cylinders at the determined engine operating point, based upon input from the exhaust gas sensor. It is determined that the each individually actuated valve control mechanism is operating properly when a difference between the individual cylinder fueling modifier and a predetermined individual cylinder fueling modifier, each said modifier determined for the corresponding cylinder at the determined engine operating point, is less than a predetermined difference.