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US 2021/0071606 A1Published application
Methods and systems for regeneration of an exhaust aftertreatment device
AssigneeFord Global Technologies, LLC
InventorsJohn Paul Bogema, Joseph Goode, Kirk Andrew Parrish, Peter Mitchell Lyon, Sanket Anil Gujarathi, William Clifford Brown
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Abstract
Methods and systems are provided for regenerating an aftertreatment device of a vehicle. In one example, a method may include adjusting conditions of the regeneration in response to a stickiness of the exhaust valve. Adjusting conditions may include adjusting an air/fuel ratio and/or a post-injection amount.
Claims20
A system, comprising:
- a particulate filter arranged in an exhaust passage of an engine;
- and
- a controller with computer-readable instructions stored on non-transitory memory thereof that when executed enable the controller to:
- adjust regeneration conditions of the particulate filter to decrease formation of a mixture comprising particulate matter and wet hydrocarbons in response to a stickiness of an exhaust valve.
1 more element
A method, comprising:
- adjusting an air/fuel ratio and a post-injection amount to decrease a mixing of particulate matter and wet hydrocarbons in response to an estimated stickiness of an exhaust valve increasing during regeneration of an aftertreatment device.
A system, comprising:
- a diesel engine fluidly coupled to an exhaust passage comprising a diesel oxidation catalyst upstream of a diesel particulate filter;
- and
- a controller comprising computer-readable instructions stored on no-transitory memory thereof that when executed enable the controller to:
- initiate an active regeneration of the diesel particulate filter in response to an exhaust backpressure exceeding a threshold backpressure;
- initiate a first stage of the active regeneration, wherein the first stage comprises a rich air/fuel ratio and a retarded combustion phasing;
- initiate a second stage of the active regeneration in response to a temperature of the diesel oxidation catalyst exceeding a first threshold temperature during the first stage, wherein the second stage comprises a lean air/fuel ratio and a first post-injection amount;
- initiate a third stage of the active regeneration in response to a temperature of the diesel particulate filter exceeding a second threshold temperature, higher than the first threshold temperature, during the second stage, wherein the third stage comprises a rich air/fuel ratio and a second post-injection amount less than the first post-injection amount;
- and
- adjust the air/fuel ratio and post-injection amount during one or more of the first, second, and third stages in response to an amount of a substance accumulated to one or more of an exhaust valve and an exhaust valve seat of the diesel engine exceeding a threshold substance amount.
6 more elements
Dependencies are inferred from the claim text.