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:
Nov. 29, 2005
Filed:
Jun. 03, 2004
Yin Chen, Dearborn, MI (US);
Woong-chul Yang, Ann Arbor, MI (US);
William R. Dutcher, Wayne, MI (US);
David K. Trumpy, Farmington Hills, MI (US);
IN Kwang Yoo, Ann Arbor, MI (US);
Chris P. Glugla, Macomb, MI (US);
Diana Brehob, Dearborn, MI (US);
Yin Chen, Dearborn, MI (US);
Woong-chul Yang, Ann Arbor, MI (US);
William R. Dutcher, Wayne, MI (US);
David K. Trumpy, Farmington Hills, MI (US);
In Kwang Yoo, Ann Arbor, MI (US);
Chris P. Glugla, Macomb, MI (US);
Diana Brehob, Dearborn, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
A method and system for operating an internal combustion engine. The internal combustion engine is operable in a plurality of compression ratio operating modes. The method includes determining a relationship between a base engine threshold load where the high compression and low compression provide substantially the same engine fuel consumption and engine speed. The determined nominal relationship is modified by a factor, such factor being a function of a condition under which such engine is operating, to obtain a modified relationship. The modified relationship is a function of engine speed and the condition has an effect on knock generation in such engine. The modified relationship and engine speed are used in selecting one of the plurality of compression ratio operating modes for the engine. A hysteresis load as a function of engine speed is determined and applied to the determined hysteresis load to the modified relationship to inhibit switching oscillations between a pair of the plurality of compression ratio operating modes.