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:
Jun. 12, 2007
Filed:
Jun. 30, 2005
Tang-wei Kuo, Troy, MI (US);
Paul M. Najt, Bloomfield Hills, MI (US);
James A. Eng, Troy, MI (US);
Barry L. Brown, Lake Orion, MI (US);
Chen-fang Chang, Troy, MI (US);
Jun-mo Kang, Ann Arbor, MI (US);
Tang-Wei Kuo, Troy, MI (US);
Paul M. Najt, Bloomfield Hills, MI (US);
James A. Eng, Troy, MI (US);
Barry L. Brown, Lake Orion, MI (US);
Chen-Fang Chang, Troy, MI (US);
Jun-Mo Kang, Ann Arbor, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A four-stroke internal combustion engine is operated in controlled auto-ignition mode by any of a variety of valve control strategies conducive to controlled auto-ignition conditions in conjunction with in-cylinder fuel charges that are at either stoichiometric or lean of stoichiometric air-fuel ratios. A measure of engine NOx emission is provided and when it crosses a predetermined threshold, the in-cylinder fuel charge is transitioned from the operative one of the stoichiometric or lean of stoichiometric air-fuel ratios to the inoperative one of the stoichiometric or lean of stoichiometric air-fuel ratios.