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:
Jul. 24, 2007
Filed:
Apr. 06, 2006
Tang-wei Kuo, Troy, MI (US);
Paul M. Najt, Bloomfield Hills, MI (US);
James A. Eng, Troy, MI (US);
Rodney B. Rask, Grosse Pointe Woods, MI (US);
Tang-Wei Kuo, Troy, MI (US);
Paul M. Najt, Bloomfield Hills, MI (US);
James A. Eng, Troy, MI (US);
Rodney B. Rask, Grosse Pointe Woods, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A method and apparatus for controlling engine operation to compensate for effects of combustion chamber deposits (CCDs) on combustion in a controlled auto-ignition engine is presented. Control methodologies comprise operation of variable valve actuation, fuel injection, spark timing, and intake air and coolant temperature to dynamically compensate for the effect of CCDs. A sensitivity to core gas temperature and chamber wall thermal conditions is shown, which is correlatable to in-cylinder CCD formation. Intake charge or coolant temperature control can be used to compensate for CCD effects. An engine control scheme relies upon a parametric input that quantifies instantaneous CCD formation in the combustion chamber. The result is further applicable to control pre-ignition in a conventional spark-ignition engine.