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. 20, 2000
Filed:
Oct. 14, 1998
Applicant:
Inventors:
Bret Alan Zimmerman, Harper Woods, MI (US);
Ace Koua Kue, Farmington Hills, MI (US);
Assignee:
Ford Global Technologies, Inc., Dearborn, MI (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
F02D / ; G01M / ;
U.S. Cl.
CPC ...
701114 ; 123479 ; 731173 ; 731181 ;
Abstract
Onboard diagnostic monitors that are affected by a changing A/F activity resulting from fuel type mixture are disabled during such activity to avoid false malfunction diagnosis. A changing A/F is detected from the difference between a fast and a slow filtered value of an input signal from a fuel type sensor. If the difference value exceed a predetermined threshold, the monitors that are affected are disabled. After the A/F has stabilized, the filtered values converge and the monitoring is resumed.