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:
Mar. 27, 2018
Filed:
Jan. 25, 2016
Ford Global Technologies, Llc, Dearborn, MI (US);
Lyth Alobiedat, Detroit, MI (US);
Gopichandra Surnilla, West Bloomfield, MI (US);
Daniel A. Makled, Dearborn, MI (US);
Mohannad Hakeem, Dearborn, MI (US);
Richard E. Soltis, Saline, MI (US);
Michael McQuillen, Warren, MI (US);
Stephen B. Smith, Livonia, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
A method for an engine may comprise, responsive to a first condition comprising a reference voltage of a first exhaust oxygen sensor operating in variable voltage mode increasing above a threshold voltage, determining a change in an output of the first exhaust oxygen sensor corresponding to the increase in the reference voltage, correcting the output of the first oxygen sensor based on the output change, and adjusting engine operation based on the corrected output. In this way, the accuracy of air-fuel estimates based on the exhaust gas sensor can be preserved, and closed loop fuel control of the engine can be maintained even when the exhaust oxygen sensor is operating VVS mode, thereby reducing engine emissions, increasing fuel economy, and increasing vehicle drivability.