Post catalyst oxygen sensor diagnostic
AssigneeGM Global Technology Operations LLC
InventorsIgor Anilovich, Thomas L. Ting, Zhong Wang, Justin F. Adams
Life of this patent
Estimating the term…
Abstract
An engine exhaust sensor diagnostic system for an exhaust system including a catalyst and a post-catalyst oxygen sensor includes a first module that calculates a total integrated area based on a signal generated by the post-catalyst oxygen sensor. A second module compares the total integrated area to a threshold integrated area and generates a pass status signal when the total integrated area is less than the threshold integrated area.
Claims23
An engine exhaust sensor diagnostic system for an exhaust system including a catalyst and a post-catalyst oxygen sensor, comprising:
- a first module that calculates a total integrated area based on a signal generated by said post-catalyst oxygen sensor;
- and
- a second module that compares said total integrated area to a threshold integrated area and that generates a pass status signal when said total integrated area is less than said threshold integrated area.
A method of determining proper operation of a post-catalyst oxygen sensor, comprising:
- calculating a total integrated area based on a signal generated by said post-catalyst oxygen sensor;
- comparing said total integrated area to a threshold integrated area;
- and
- generating a pass status signal when said total integrated area is less than said threshold integrated area.
A method of determining proper operation of a post-catalyst oxygen sensor, comprising:
- transitioning an air-to-fuel ratio between rich and lean;
- calculating a total integrated area based on a signal generated by said post-catalyst oxygen sensor during a transition between rich and lean;
- comparing said total integrated area to a threshold integrated area;
- generating a pass status signal when said total integrated area is less than said threshold integrated area;
- and
- generating a fail status signal when said total integrated area is not less than said threshold integrated area.
Dependencies are inferred from the claim text.