Method for regeneration of diesel particulate filter in an exhaust aftertreatment system of an IC engine
AssigneeDeere & Company
InventorRichard E. Winsor
Life of this patent
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Abstract
A method for regenerating a DPF in an exhaust aftertreatment system includes the steps of: monitoring a temperature of exhaust associated with a DOC; retarding an injection of fuel into at least one combustion cylinder, and thereby intentionally causing a misfire in the at least one combustion cylinder, dependent on the monitoring step; increasing an outlet temperature of the exhaust from the DOC to a first threshold temperature; and oxidizing particulates within the DPF when the exhaust is at the increased temperature. The number and/or frequency of the misfires is controlled to provide the desired exhaust temperature at the DPF inlet.
Claims5
A method for regenerating a diesel particulate filter (DPF) in an exhaust aftertreatment system, said method comprising the steps of:
- monitoring a temperature of exhaust associated with a diesel oxidation catalyst (DOC);
- retarding an injection of fuel into at least one combustion cylinder, and thereby intentionally causing a misfire in said at least one combustion cylinder, dependent on said monitoring step;
- increasing an outlet temperature of the exhaust from said DOC to a first threshold temperature;
- and
- oxidizing particulates within the DPF when the exhaust is at the increased temperature, wherein said step of intentionally causing a misfire in said at least one combustion cylinder is carried out to selectively control at least one of a number and frequency of misfires within said at least one combustion cylinder dependent on a quantity of fuel of each fuel injection, an exhaust inlet temperature to the DOC, and an exhaust outlet temperature from the DOC, wherein said step of intentionally causing a misfire in said at least one combustion cylinder is carried out if said monitored temperature of said DOC is above a second threshold temperature.
Dependencies are inferred from the claim text.