Method, system, and apparatus for diagnosing an exhaust aftertreatment component
AssigneeCummins IP, Inc.
InventorsNassim Khaled, Richard Booth
Life of this patent
Estimating the term…
Abstract
According to one embodiment, an apparatus is disclosed for diagnosing a condition of a component of an exhaust aftertreatment system in exhaust receiving communication with an internal combustion engine where the exhaust aftertreatment system includes a selective catalytic reduction (SCR) catalyst. The diagnostic module is configured to determine a normalized tailpipe nitrogen-oxide NOx value based on a tailpipe NOx sensor signal and a ratio of an SCR inlet ammonia (NH3) flow rate to an SCR inlet NOx flow rate. The apparatus also includes a component condition module configured to determine a condition of the component based on the normalized tailpipe NOx value.
Claims20
An apparatus for diagnosing a condition of a component of an exhaust aftertreatment system in exhaust receiving communication with an internal combustion engine, the exhaust aftertreatment system having a selective catalytic reduction (SCR) catalyst, comprising:
- a controller structured to be coupled to the exhaust aftertreatment system, the controller including:
- a diagnostic module structured to determine a normalized tailpipe nitrogen-oxide NOx value based on a tailpipe NOx sensor signal and a ratio of an SCR inlet ammonia (NH3) flow rate to an SCR inlet NOx flow rate;
- a component condition module structured to determine a condition of the component based on the normalized tailpipe NOx value;
- and
- an on-board diagnostic module structured to communicate an alert signal to an on-board diagnostic system, wherein the alert signal causes the on-board diagnostic system to provide an indication of the condition of the component to a user.
A system, comprising:
- an internal combustion engine generating an exhaust gas;
- an exhaust aftertreatment system in exhaust gas receiving communication with the internal combustion engine, the exhaust aftertreatment system comprising an exhaust treatment component and a selective catalytic reduction (SCR) catalyst downstream of the exhaust treatment component;
- and
- a controller structured to determine a normalized level of nitrogen-oxide (NOx) in exhaust gas downstream of the SCR catalyst, and further structured to determine a condition of the exhaust treatment component based on the normalized level of NOx, and further structured to communicate an alert signal to an on-board diagnostic system, wherein the alert signal causes the on-board diagnostic system to provide an indication of the condition of the exhaust treatment component to a user.
A method for diagnosing a condition of a component of an exhaust aftertreatment system in exhaust receiving communication with an internal combustion engine, the exhaust aftertreatment system having a selective catalytic reduction (SCR) catalyst downstream of the component, comprising:
- detecting a quantity of nitrogen-oxide (NOx) in exhaust gas downstream of the SCR catalyst;
- normalizing the detected quantity of NOx based on a ratio of an ammonia NH3 flow rate upstream of the SCR catalyst to a NOx flow rate upstream of the SCR catalyst;
- determining the condition of the component based on the normalized detected quantity of NOx;
- and
- communicating an alert signal to an on-board diagnostic system, wherein the alert signal causes the on-board diagnostic system to provide an indication of the condition of the component to a user.
Dependencies are inferred from the claim text.