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:
Mar. 16, 2010
Filed:
Apr. 11, 2008
Daniel L. Mckay, Brighton, MI (US);
Gerard W. Malaczynski, Bloomfield Hills, MI (US);
Joshua J. Titus, Ann Arbor, MI (US);
Daniel L. McKay, Brighton, MI (US);
Gerard W. Malaczynski, Bloomfield Hills, MI (US);
Joshua J. Titus, Ann Arbor, MI (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
A system and method for identifying the cylinders having the lowest ('weakest') and highest ('strongest') Indicated Mean Effective Pressure (IMEP) utilizes engine speed derivative and/or higher order derivative values typically available in an engine control module by virtue of the need to detect misfire. A delta parameter is calculated that is indicative of the difference between the engine speed derivatives and/or higher order derivatives for the “weakest” and the “strongest” cylinders. Control action is then taken to balance the cylinders, based on the delta parameter, by first increasing torque for the “weakest” cylinder, by at least one increasing spark advance, increasing fuel, decreasing dilution (EGR) or slowing decay of fuel control on cold start. Once the weakest cylinder has been balanced, the control action is then directed to increasing torque of the new “weakest” cylinder.