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:
Oct. 31, 2006
Filed:
Jul. 26, 2004
Tang-wei Kuo, Troy, MI (US);
Barry L. Brown, Lake Orion, MI (US);
Paul M. Najt, Bloomfield Hills, MI (US);
Thompson Milton Sloane, Oxford, MI (US);
Hardo Barths, Royal Oak, MI (US);
Tang-Wei Kuo, Troy, MI (US);
Barry L. Brown, Lake Orion, MI (US);
Paul M. Najt, Bloomfield Hills, MI (US);
Thompson Milton Sloane, Oxford, MI (US);
Hardo Barths, Royal Oak, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
Part load operating point for a controlled auto-ignition four-stroke internal combustion engine is reduced without compromising combustion stability through negative valve overlap control operative to retain and compress combusted gases within the combustion chamber into which fuel is introduced. Combustion chamber pressures and temperatures are increased as engine load decreases. Various split-injection fuel controls are implemented during low and intermediate part load operation whereas a single-injection fuel control is implemented during high part load operation. Split-injections are characterized by lean fuel/air ratios and single-injections are characterized by either lean or stoichiometric fuel/air ratios. Controlled autoignition is thereby enabled through an extended range of engine loads while maintaining acceptable combustion stability and emissions.