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:
Jan. 09, 2018
Filed:
Aug. 12, 2016
Delphi Technologies, Inc., Troy, MI (US);
James P. Waters, Waterford, MI (US);
DELPHI TECHNOLOGIES, INC., Troy, MI (US);
Abstract
A method for diagnosing a variable-lift camshaft follower of an internal combustion includes detecting a first knock using a spark knock sensor of the internal combustion engine; retarding ignition timing of the internal combustion engine after detecting the first knock such that the ignition timing is retarded sufficiently to ensure that spark knock is no longer possible; detecting a second knock using the spark knock sensor after retarding the ignition timing sufficiently to ensure that spark knock is no longer possible; determining that the variable-lift camshaft follower is not functioning as desired based on the second knock; and activating a malfunction alert based on the determining that the variable-lift camshaft follower is not functioning as desired.