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:
Aug. 05, 1997
Filed:
Nov. 17, 1995
Douglas Ray Hamburg, Bloomfield Hills, MI (US);
Dennis Craig Reed, Plymouth, MI (US);
Ford Global Technologies, Inc., Dearborn, MI (US);
Abstract
An engine air/fuel control system is disclosed which is responsive to first and second exhaust gas oxygen sensors respectively positioned upstream and downstream of a catalytic converter. Air/fuel feedback control is disabled, and a rich offset to fuel flow is provided to cause a corresponding rich offset in engine air/fuel ratio. A predetermined time afterwards, a lean offset in fuel flow is provided. Air/fuel feedback control is reinitiated, and fuel delivery is biased with a rich fuel bias when the downstream sensor indicates excessively lean engine exhaust in response to the lean fuel offset and biased with a lean fuel bias when the downstream sensor indicates excessively rich exhaust gases in response to the rich fuel offset.