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, 2017
Filed:
Jun. 26, 2015
Ford Global Technologies, Llc, Dearborn, MI (US);
Gopichandra Surnilla, West Bloomfield, MI (US);
Todd Anthony Rumpsa, Saline, MI (US);
James Alfred Hilditch, Canton, MI (US);
Timothy Joseph Clark, Livonia, MI (US);
Ralph Wayne Cunningham, Milan, MI (US);
Julia Helen Buckland, Commerce Township, MI (US);
Daniel Joseph Styles, Canton, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
Methods and systems are provided for reducing EGR estimation errors during lean engine operating conditions. During lean engine operation, EGR is disabled if the estimated exhaust air-fuel ratio becomes leaner than a lean threshold. The lean threshold is adjusted based on an upper limit of EGR errors that may be tolerated by the engine at a given engine speed and load.