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 |
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.
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