Aftertreatment catalyst degradation compensation
OwnerJames C. Clerc, Timothy M. White +2inventors
InventorsJames C. Clerc, Timothy M. White, Melissa A. Zaczek, Baohua Qi
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Abstract
One embodiment is a method including providing an aftertreatment catalyst disposed in an exhaust stream of an internal combustion engine and a reductant that reacts with an amount of NOx in the exhaust stream in the presence of the aftertreatment catalyst. The method includes interpreting a catalyst degradation value corresponding to the aftertreatment catalyst, and interpreting a nominal reductant value. The method further includes determining an adjusted reductant value in response to the catalyst degradation value and the nominal reductant value, and injecting the reductant into the exhaust stream at a rate based on the adjusted reductant value.
Claims26
A method, comprising:
- providing an aftertreatment catalyst disposed in an exhaust stream of an internal combustion engine;
- providing a reductant that reacts with an amount of NOx in the exhaust stream in the presence of the aftertreatment catalyst;
- interpreting a catalyst degradation value corresponding to the aftertreatment catalyst;
- interpreting a nominal reductant value;
- determining an adjusted reductant value in response to the catalyst degradation value and the nominal reductant value;
- and
- injecting the reductant into the exhaust stream at a rate based on the adjusted reductant value.
A system, comprising:
- an aftertreatment catalyst disposed in an exhaust stream of an internal combustion engine;
- a reductant that reacts with an amount of NOx in the exhaust stream in the presence of the aftertreatment catalyst;
- an injector structured to inject the reductant into the exhaust stream at a position upstream of the aftertreatment catalyst;
- a degradation module structured to interpret a catalyst degradation value corresponding to the aftertreatment catalyst;
- an injection amount module structured to interpret a nominal reductant value comprising a nominal reductant to NOx ratio;
- a degradation compensation module structured to determine an adjusted reductant value in response to the catalyst degradation value and the nominal reductant value;
- and
- an injection control module structured to provide an injection rate signal based on the adjusted reductant value;
- and
- an injector structured to inject the reductant into the exhaust stream at a position upstream of the aftertreatment catalyst in response to the injection rate signal.
An apparatus, comprising:
- a degradation module structured to interpret a catalyst degradation value corresponding to an aftertreatment catalyst;
- an injection amount module structured to interpret a nominal reductant value comprising a nominal reductant to NOx ratio;
- a degradation compensation module structured to determine an adjusted reductant value in response to the catalyst degradation value and the nominal reductant value;
- and
- an injection control module structured to provide an injection rate signal based on the adjusted reductant value.
A method, comprising:
- interpreting a catalyst degradation value corresponding to an aftertreatment catalyst;
- interpreting a nominal reductant value comprising a nominal reductant to NOx ratio;
- determining an adjusted reductant value in response to the catalyst degradation value and the nominal reductant value;
- providing an injection rate signal based on the adjusted reductant value;
- and
- injecting an amount of reductant into an exhaust stream in response to the injection rate signal.
Dependencies are inferred from the claim text.