Oxygen sensor diagnostic
AssigneeGM Global Technology Operations LLC
InventorsJunhong Dai, Douglas Dickson, John W. Siekkinen, Jerry J. Sheahan, Jeffry A. Helmick
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Abstract
According to one or more embodiments of the technical solutions described herein, a control system in a motor vehicle that includes an internal combustion engine includes an oxygen sensor, and an oxygen sensor diagnosis module to diagnose the oxygen sensor. The oxygen sensor diagnosis includes performing an intrusive rich-to-lean diagnostic for the oxygen sensor, and detecting a lean-to-rich diagnostic event. In response, the diagnosis includes performing a passive lean-to-rich diagnostic for the oxygen sensor, the lean-to-rich diagnostic event comprising a fuel enrichment.
Claims20
A control system in a motor vehicle including an internal combustion engine, the control system comprising:
- an oxygen sensor;
- and
- an oxygen sensor diagnosis module configured to diagnose the oxygen sensor, the oxygen sensor diagnosis comprising:
- performing an intrusive rich-to-lean diagnostic for the oxygen sensor;
- and
- detecting a lean-to-rich diagnostic event, and in response, performing a passive lean-to-rich diagnostic for the oxygen sensor, the lean-to-rich diagnostic event comprising a fuel enrichment.
An on-board oxygen sensor diagnostic apparatus for an internal combustion engine, the on-board oxygen sensor diagnostic apparatus comprising:
- a controller configured to diagnose one or more oxygen sensors, the oxygen sensor diagnosis comprising:
- performing an intrusive rich-to-lean diagnostic for the one or more oxygen sensors;
- and
- detecting a lean-to-rich diagnostic event, and in response, performing a passive lean-to-rich diagnostic for the one or more oxygen sensors, the lean-to-rich diagnostic event comprising a fuel enrichment.
A computer-implemented method for diagnosing one or more oxygen sensors in an exhaust system of an internal combustion engine in a motor vehicle, the method comprising:
- performing an intrusive rich-to-lean diagnostic for the oxygen sensor;
- and
- detecting a lean-to-rich diagnostic event, and in response, performing a passive lean-to-rich diagnostic for the oxygen sensor, the lean-to-rich diagnostic event comprising a fuel enrichment.
Dependencies are inferred from the claim text.