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US 11,143,073 B2Granted
Methods and systems for a diesel oxidation catalyst
AssigneeFord Global Technologies, LLC
InventorsDouglas Allen Dobson, Timothy Brian Chanko, Christine Kay Lambert
Life of this patent
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Abstract
Systems are provided for a diesel oxidation catalyst. In one example, the diesel oxidation catalyst comprises a washcoat with different catalytically active portions for reacting with one or more of carbon containing compounds and NOx. The diesel oxidation catalyst is located upstream of a particulate filter in an exhaust passage.
Claims19
A system comprising:
- a catalyst located in an exhaust passage of an engine driven vehicle, where the catalyst comprises a washcoat having a zirconium oxide support, one or more base metal oxides and at least a precious metal oxide, wherein the one or more base metal oxides and the precious metal oxide are on different portions of the zirconium oxide support, wherein the base metal oxides comprise Mn, Cu, and Ce in a weight percent ratio of 20:7.5:15;
- a particulate filter located in a position of the exhaust passage downstream of the catalyst relative to a direction of exhaust gas flow;
- and
- a controller with computer readable instructions stored thereon that enable the controller to:
- actively regenerate the particulate filter via adjusting actuators to increase an exhaust gas temperature to a temperature greater than a threshold temperature, where an exhaust gas flow rate is outside of a range between upper and lower threshold flow rates and adjust the exhaust gas flow rate to a rate between the upper and lower threshold exhaust gas flow rates.
2 more elements
A system comprising:
- a catalyst located in an exhaust passage of an engine driven vehicle, where the catalyst comprises a washcoat having a zirconium oxide support, one or more base metal oxides and a palladium oxide, where the palladium oxide is contained in an upstream portion of the catalyst relative to a direction of exhaust gas flow, and wherein the one or more base metal oxides are contained in a downstream portion of the catalyst relative to the direction of exhaust gas flow;
- a particulate filter located in a position of the exhaust passage downstream of the catalyst relative to the direction of exhaust gas flow;
- and
- a controller with computer readable instructions stored thereon that enable the controller to:
- actively regenerate the particulate filter via adjusting actuators to increase an exhaust gas temperature to a temperature greater than a threshold temperature and adjust an exhaust gas flow rate to a rate between upper and lower threshold exhaust gas flow rates.
2 more elements
A system comprising:
- a catalyst located in an exhaust passage of an engine driven vehicle, where the catalyst comprises a washcoat having a zirconium oxide support, and at least a manganese oxide and a palladium oxide;
- a particulate filter located in a position of the exhaust passage downstream of the catalyst relative to a direction of exhaust gas flow;
- and
- a controller with computer readable instructions stored thereon that enable the controller to:
- regenerate the particulate filter without adjusting engine operating parameters during a first mode;
- facilitate the particulate filter regeneration with oxygen by adjusting the engine operating parameters to increase an exhaust gas temperature by a first magnitude during a second mode, where an exhaust gas flow rate is lower than a lower threshold flow rate;
- and
- facilitate the particulate filter regeneration with NO2 by adjusting the engine operating parameters to increase the exhaust gas temperature by a second magnitude during a third mode, where the NO2 is produced by the catalyst located upstream of the particulate filter, where the exhaust gas flow rate is within a range between the lower threshold flow rate and an upper threshold flow rate, and wherein the first magnitude is greater than the second magnitude.
5 more elements
Dependencies are inferred from the claim text.