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US 10,865,678 B2Granted
Methods and systems for an exhaust gas aftertreatment arrangement
AssigneeFord Global Technologies, LLC
InventorsEvgeny Smirnov, Robert Ukropec, Dirk Roemer, Maria Armiento, Jan Harmsen
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Abstract
Methods and systems are provided for an exhaust gas arrangement. In one example, a system comprises an air supply device arranged between a first LNT and a second LNT. The air supply device positioned to adjust an air/fuel ratio and a temperature of exhaust gas flowing to the second LNT and devices downstream thereof.
Claims18
A system comprising:
- a first lean NOx trap arranged upstream of a second lean NOx trap in an exhaust passage;
- an air injector arranged between the first and second lean NOx traps;
- a selective catalytic reduction device arranged downstream of the second lean NOx trap;
- and
- a controller with computer-readable instructions stored on non-transitory memory thereof that when executed enable the controller to:
- adjust an air flow from the air injector during a regeneration of the first lean NOx trap;
- and
- adjust the air flow during the regeneration of the second lean NOx trap with a rich exhaust gas in response to a temperature of the rich exhaust gas being greater than a threshold temperature.
5 more elements
An engine system comprising:
- an exhaust passage fluidly coupled to an engine, the exhaust passage housing a first LNT upstream of a second LNT, and a SCR device arranged downstream of the second LNT;
- an injector positioned to inject air directly into a portion of the exhaust passage between the first LNT, the second LNT, and an exhaust gas sensor;
- and
- a controller with computer-readable instructions stored on non-transitory memory thereof that when executed enable the controller to:
- adjust an engine air/fuel ratio to a rich air/fuel ratio and an air flow rate of the injector in response to a temperature of the second LNT being greater than a threshold temperature, wherein the air flow rate increases as a load of the second LNT decreases.
2 more elements
A method comprising:
- injecting air from an injector of an air supply device positioned to inject between a first LNT and a second LNT in response to the first LNT being desulfated;
- wherein
- the injecting air from the injector is in response to a temperature of the second LNT being less than a threshold DeSOx temperature;
- and
- injecting air from the injector in response to the temperature of the second LNT being greater than an upper threshold temperature, which is greater than the threshold DeSOx temperature, wherein an air supply rate is based on a difference between the temperature of the second LNT and the upper threshold temperature.
2 more elements
Dependencies are inferred from the claim text.