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US 2023/0417631 A1Published application
System and method for diagnosing an exhaust gas sensor
AssigneeFord Global Technologies, LLC
InventorsJose Francisco Martinez Leyva, Andrew Bagnasco, Tyler DeWine, Hassene Jammoussi, Adam Krach, Gladys Galicia
Life of this patent
Estimating the term…
Abstract
A method and system for monitoring an exhaust gas sensor coupled in an engine exhaust is provided. In one example, the method determines an estimate of an exhaust gas oxygen sensor time constant according to a correlation between a rate of change of a Lambda value and a system time constant.
Claims20
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, the time constant of the exhaust gas sensor estimated based on a rate of change of an output of the exhaust gas sensor during a time period.
A system for a vehicle, comprising:
- an engine including a fuel injection system;
- an exhaust gas sensor coupled in an exhaust system of the engine;
- and
- a controller including instructions executable to:
- estimate an oxygen sensor time constant from a theoretical system time constant and a correlation between a rate of change of a signal and a system time constant;
- and
- additional instructions to indicate a presence or absence of degradation of the exhaust gas sensor in response to the oxygen sensor time constant.
4 more elements
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, the time constant of the exhaust gas sensor estimated based on a rate of change of an output of the exhaust gas sensor during a time period;
- and
- adjusting parameters of a fuel controller according to the time constant of the exhaust gas sensor.
Dependencies are inferred from the claim text.