Patent Number: 7,822,529

Title: Method and apparatus for determining a parameter for normalized instantaneous heat release in an internal combustion engine

Abstract: Operation of an internal combustion engine selectively operative in a controlled auto-ignition combustion mode is monitored. The engine is equipped with a pressure sensing device operative to monitor in-cylinder pressure. An analog signal output from the pressure sensing device is monitored during a combustion cycle. A peak cylinder pressure and a corresponding crank angle are detected and captured during the combustion cycle. A state for a combustion parameter for the cylinder for the combustion cycle is determined based upon the peak cylinder pressure and the corresponding crank angle.

Inventors: Dagci; Oguz H. (Sterling Heights, MI), Brown; Alan W. (Canton, MI), Kang; Jun-Mo (Ann Arbor, MI)

Assignee: GM Global Technology Operations, Inc.

International Classification: F02D 45/00 (20060101); G01M 15/08 (20060101); G01M 15/06 (20060101)

Expiration Date: 2018-10-26 0:00:00