DEVICE AND METHOD FOR REGENERATING A PARTICULATE FILTER ARRANGED IN THE EXHAUST SECTION OF AN INTERNAL COMBUSTION ENGINE

摘要

A device and a method for regenerating a particulate filter that is arranged in the exhaust tract of an internal combustion engine. There is disposed at least one NO oxidation catalytic converter upstream of the particulate filter for the oxidation of NO, and in particular to form NO2. At least one heating device is also provided upstream of the particulate filter, by way of which an exhaust-gas flow that is conducted towards the particulate filter can be heated to a defined temperature in accordance with defined regeneration parameters, in particular in accordance with a degree of loading of the particulate filter and/or in accordance with an efficiency of an NO2-based regeneration of the particulate filter by way of an NO2 quantity formed in the at least one NO oxidation catalytic converter.

主权项

1. A configuration for regenerating a particle filter arranged in an exhaust tract of an internal combustion engine, comprising:
at least one NO oxidation catalytic converter for oxidizing NO arranged upstream of the particle filter in an exhaust-gas flow direction; at least one heating device arranged upstream of the particle filter and configured to heat an exhaust-gas flow being conducted to the particle filter to a defined temperature in dependence of one or more defined regeneration parameters; wherein, for effecting an at least temporarily combined active and passive particle filter regeneration, said at least one heating device is connected in parallel, with regard to the exhaust-gas flow, with said NO oxidation catalytic converter, so as to cause a first exhaust-gas flow to flow through said NO oxidation catalytic converter and a second exhaust-gas flow to flow through or over said heating device, and wherein the first and second exhaust-gas flows are merged downstream of said NO oxidation catalytic converter and said heating device and upstream of the particle filter; and wherein, at least during a regeneration phase characterized by a defined increase in the exhaust-gas temperature upstream of the particle filter, a mass ratio between carbon and nitrogen dioxide contained in the exhaust gas is at least 1:4.