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:
Aug. 26, 2008
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
The invention comprises a method to operate a direct-injection engine operative at various air/fuel ratios. The method comprises monitoring in-cylinder pressure, along with a corresponding engine crank position to periodically to determine instantaneous in-cylinder pressure states corresponding to the engine crank position during compression and expansion. Pressure ratios are determined based upon the instantaneous in-cylinder pressure states. A combustion heat release is determined based upon the pressure ratios. An aspect of the invention comprises extending the operation to diesel, diesel premixed and to HCCI engines.