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:
Jan. 06, 2009
Filed:
Jan. 22, 2007
Thomas Wittefeldt, Huddinge, SE;
Richard Backman, Södertälje, SE;
Erik Sunnegårdh, Älvsjö, SE;
Staffan Seth, Järfälla, SE;
Thomas Wittefeldt, Huddinge, SE;
Richard Backman, Södertälje, SE;
Erik Sunnegårdh, Älvsjö, SE;
Staffan Seth, Järfälla, SE;
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
The air fuel ratio of an engine adapted to run on a mixture of alcohol and gasoline can be adapted by a method wherein the air fuel ratio is controlled using an ethanol adaptation value, including reducing the enrichment factor from an initial value until a lean switch from rich conditions to lean conditions is detected, determining a first enrichment factor value at which the lean switch occurs, increasing the enrichment factor until a rich switch from lean conditions to rich conditions is detected, determining a second enrichment factor value at which the rich switch occurs, calculating the average value between the first enrichment factor value and the second enrichment factor value, adjusting the air fuel ratio using the average value.