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:
Jun. 25, 2002
Filed:
Sep. 13, 2001
Jessy W. Grizzle, Ann Arbor, MI (US);
Jing Sun, Bloomfield, MI (US);
Ford Global Technologies, Inc., Dearborn, MI (US);
Abstract
A computer readable storage medium having stored data representing instructions for controlling a spark ignited direct injection internal combustion engine having a plurality of cylinders operable in at least homogeneous and stratified modes, includes instructions for determining a desired value for an engine operating parameter based on current engine operating conditions wherein the desired value results in scheduling of an air/fuel ratio between homogeneous range and stratified range of allowable air/fuel ratios, instructions for operating a first portion of the cylinders in the homogenous operating mode, and instructions for operating a second portion of the cylinders in the stratified operating mode such that a combined air/fuel ratio associated with the first and second portions of the cylinders approaches the scheduled air/fuel ratio.