Patent ID: 6854263
Filing Date: 2005-02-15
Classification: B01D,F01N,F01P,F02D,Y02T

Abstract:
1. In a method for regulating the temperature range of an NOx accumulator for purifying an internal combustion engine exhaust gas stream guided in an exhaust tract, the improvement which comprises: discharging a heat flow from the exhaust gas stream upstream of the NOx accumulator as a function of an operating state of the internal combustion engine, for at least one of reliably preventing a maximum load temperature of the NOx accumulator from being exceeded and approximately maintaining a predeterminable temperature range; discharging at least part of heat energy contained in the exhaust gas as the heat flow from the exhaust gas stream, at least one of upstream and downstream of a catalytic converter; and storing the NOx emissions intermediately in the NOx accumulator.