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. 14, 1995
Filed:
Dec. 06, 1994
Douglas R Hamburg, Bloomfield, MI (US);
Eleftherios M Logothetis, Birmingham, MI (US);
Daniel L Meyer, Dearborn, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
An air/fuel control system (8) generates a fuel command (100) for fuel delivery to the engine (28) based upon at least an amount of air inducted into the engine. This fuel command is trimmed by a feedback variable derived (240-282) from an exhaust gas oxygen sensor (44) when feedback control is initiated. Feedback control is commenced when the peak-to-peak output of the sensor is less than a threshold value (122-128) while pumping current applied to a sensor electrode is modulated (122-128). Modulation is then removed but the pumping current is maintained to shift the sensor output to a preselected lean air/fuel ratio (128). Lean air/fuel feedback control continues until the converter is warmed (130-140).