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. 10, 1998
Filed:
Mar. 31, 1997
Applicant:
Inventors:
Michael John Cullen, Northville, MI (US);
David George Farmer, Plymouth, MI (US);
Arnold William Brandt, Livonia, MI (US);
Jeffrey Scott Hepburn, Dearborn, MI (US);
Assignee:
Ford Global Technologies, Inc., Dearborn, MI (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
F01N / ;
U.S. Cl.
CPC ...
60274 ; 60285 ; 60297 ;
Abstract
An engine control computer estimates the cumulative SO.sub.x stored in a NO.sub.x trap and enters a SO.sub.x purge mode of operation when a maximum storage capacity limit is exceeded. SO.sub.x accumulation is estimated based on fuel flow to the engine, A/F and trap temperature. The purge mode is terminated when the estimated SO.sub.x storage level drops below a minimum threshold level during the purging operation.