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:
Nov. 12, 2013
Filed:
Nov. 05, 2009
Igor Anilovich, Walled Lake, MI (US);
John W. Siekkinen, Novi, MI (US);
Wesley W. Wald, Linden, MI (US);
Robert J. Genslak, Macomb, MI (US);
Jeffry A. Helmick, Oxford, MI (US);
John F. Van Gilder, Webberville, MI (US);
Igor Anilovich, Walled Lake, MI (US);
John W. Siekkinen, Novi, MI (US);
Wesley W. Wald, Linden, MI (US);
Robert J. Genslak, Macomb, MI (US);
Jeffry A. Helmick, Oxford, MI (US);
John F. Van Gilder, Webberville, MI (US);
Abstract
A diagnostic system for an engine includes a stage transition module and a control module. The stage transition module generates a command signal based on a fuel control signal. The command signal commands a fuel system of the engine to intrusively transition between rich and lean states during a diagnostic test that includes first, second, and third stages. The first, second, and third stages are defined based on transitions between the rich and lean states. The control module during the second and third stages detects: an error with a first oxygen sensor based on a comparison between the command signal and a first oxygen signal from the first oxygen sensor; an error with a second oxygen sensor based on a second oxygen signal from the second oxygen sensor; and an error with a catalytic converter based on the first and second oxygen signals and a manifold absolute pressure signal.