US 12,169,155 B2
System and method for diagnosing an exhaust gas sensor
Andrew Bagnasco, Plymouth, MI (US); Jose Francisco Martinez Leyva, Mexico City (MX); Tyler DeWine, Ann Arbor, MI (US); Hassene Jammoussi, Canton, MI (US); Adam Krach, Canton, MI (US); and Gladys Galicia, Shelby Township, MI (US)
Assigned to Ford Global Technologies, LLC, Dearborn, MI (US)
Filed by Ford Global Technologies, LLC, Dearborn, MI (US)
Filed on Feb. 13, 2023, as Appl. No. 18/168,301.
Prior Publication US 2024/0272038 A1, Aug. 15, 2024
Int. Cl. G01M 15/10 (2006.01); F02D 21/04 (2006.01); F02D 21/08 (2006.01); F02D 35/00 (2006.01); F02D 41/14 (2006.01)
CPC G01M 15/104 (2013.01) [F02D 21/04 (2013.01); F02D 21/08 (2013.01); F02D 35/0046 (2013.01); F02D 41/1454 (2013.01); F02D 41/1476 (2013.01); F02D 41/1495 (2013.01); F02D 2021/083 (2013.01); F02D 2700/0287 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of monitoring an exhaust gas sensor in an engine exhaust passage, comprising:
generating an indication of exhaust gas sensor degradation via a controller according to a time constant of the exhaust gas sensor exceeding a threshold during a fuel cut-off entry and exit, the time constant of the exhaust gas sensor estimated based on a comparison of air/fuel ratios of the exhaust gas sensor; and
adjusting engine fuel delivery based on the time constant.