Patent ID: 7412822
Filing Date: 2008-08-19
Classification: F01N,F02D,Y02T

Abstract:
1. A method of regenerating a diesel particulate filter (DPF) in the exhaust line of a diesel engine, comprising: increasing the temperature at the DPF from an operating temperature to a regeneration temperature; wherein the increasing step is performed at least in part by injecting supplemental fuel upstream the DPF, using a variable fuel injection rate; controlling the rate of the increasing step such that temperature increases occur substantially linearly during an optimal temperature increase period; maintaining the regeneration temperature during a regeneration period; decreasing the temperature at the DPF back to the operating temperature; wherein the increasing, maintaining, and decreasing steps are performed during a temperature profile period in which the duration of the increasing step has at least a 1:2 ratio with the duration of the regeneration period and the duration of the decreasing step has at least a 1:1 ratio with the duration of the regeneration period.