Patent ID: 7185486
Filing Date: 2007-03-06
Classification: B01D,F01N,F02D,Y02T

Abstract:
1. A process for exhaust gas aftertreatment by afterinjection of fuel in a diesel internal injection with a precatalyst and a particulate filter, the afterinjection NE being performed as a function of the temperature in the area of the precatalyst T cat near the engine, and the state of charging of the particulate filter, wherein the state of charging of the particular filter is indicated by means of a counter Z and the afterinjection NE is permitted only after a specific counter reading Z reg corresponding to a prescribed state of charging has been reached and the level of the counter Z is increased if the mean regeneration temperature T RM situated between the upper regeneration temperature T RO and the lower regeneration temperature T RU is not reached within a specific time period t start after a cold start of the diesel internal combustion engine and the afterinjection is activated with the temperature in the area of the precatalyst T cat exceeds a startup temperature T LO of approximately 160 degrees Celsius, such that the conversion rate for unburnt hydrocarbons is at least 50%.