Patent ID: 8615989
Filing Date: 2013-12-31
Classification: F01N,F02D,Y02T

Abstract:
1. 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.