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:
Dec. 31, 2013
Filed:
May. 02, 2011
Nicole Wermuth, Garching Bei München, DE;
Paul M. Najt, Bloomfield Hills, MI (US);
Kushal Narayanaswamy, Sterling Heights, MI (US);
Hanho Yun, Oakland Township, MI (US);
Nicole Wermuth, Garching Bei München, DE;
Paul M. Najt, Bloomfield Hills, MI (US);
Kushal Narayanaswamy, Sterling Heights, MI (US);
Hanho Yun, Oakland Township, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A direct-injection internal combustion engine is fluidly coupled to a passive SCR system including a three-way catalytic converter upstream to an ammonia-selective catalytic reduction catalyst. Transition from an HCCI combustion mode to an SI combustion mode includes determining a preferred air/fuel ratio to achieve a minimum fuel consumption and maintain combustion stability at an acceptable level for a predetermined engine operating point during the SI combustion mode. A fuel injection timing, an engine spark timing and an engine valve lift are substantially immediately controlled from respective HCCI combustion mode settings to respective SI combustion mode settings. A transition to the preferred air/fuel ratio is coordinated with a transition of an engine valve phase from a respective HCCI combustion mode setting to a respective SI combustion mode phase setting.