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:
Sep. 29, 2009
Filed:
Apr. 24, 2007
Frederic Anton Matekunas, Troy, MI (US);
Paul Anthony Battiston, Clinton Township, MI (US);
Patrick G. Szymkowicz, Shelby Township, MI (US);
Anupam Gangopadhyay, Troy, MI (US);
Frederic Anton Matekunas, Troy, MI (US);
Paul Anthony Battiston, Clinton Township, MI (US);
Patrick G. Szymkowicz, Shelby Township, MI (US);
Anupam Gangopadhyay, Troy, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A method for controlling operation of an internal combustion engine operating lean of stoichiometry is described. The engine is a multi-cylinder direct-injection engine operative in repetitive cycles each cycle including intake, compression, expansion, and exhaust strokes. The method includes adapting a plurality of fuel injectors to directly inject a first and a second mass of fuel into the cylinders during each cycle. Pressure sensing devices monitor in-cylinder pressure in the cylinders during ongoing operation. The first mass of fuel is injected into one of the cylinders. A cylinder pressure ratio is determined in the cylinder subsequent to injecting the first mass of fuel based upon the monitored pressure. The first mass of fuel injected is adjusted during a subsequent cycle based upon the cylinder pressure ratio.