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:
Jul. 23, 1996
Filed:
Mar. 06, 1995
Robert W Ridgway, Royal Oak, MI (US);
Michael P Falandino, Wyandotte, MI (US);
Thomas S Gee, Canton, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
An engine air/fuel controller (12) is responsive to a two-state exhaust gas oxygen sensor (16) positioned upstream of a three-way catalytic converter (20) and a proportional exhaust gas oxygen sensor (24) positioned downstream of the catalytic converter. A base fuel signal is trimmed by a feedback variable derived by integrating (402-428) the upstream (16) sensor output. The feedback variable is biased towards leaner air/fuel ratios when a distribution of the downstream sensor output amplitudes has a peak value indicating a rich air/fuel ratio. And the feedback variable is biased towards richer air/fuel ratios when the downstream sensor output distribution has a peak value indicating a lean air/fuel ratio (320-396).