FIELD: motor industry.
SUBSTANCE: according to the present invention a method and an exhaust treatment system are provided for treatment of an exhaust stream, which results from combustion in an internal combustion engine and comprises nitrogen oxides NOx. Method comprises a first impact on a first amount of nitrogen oxides NOx_1, reaching a first device arranged in the exhaust, treatment system. Said first impact is carried out through the use of at least one of a NOx-storing catalyst NCC and a first slip-catalyst SC1 arranged in the first device. Here, NOx-storing catalyst NCC may carry out storage of nitrogen oxides NOX. First slip-catalyst SC1 may carry out reduction of nitrogen oxides NOx, and/or oxidation of a potential additive in the exhaust stream through the exhaust system. Said first impact is actively controlled based at least on the first amount of nitrogen oxides NOX-1 reaching the first device. Method also comprises a second impact on a second amount of nitrogen oxides NOx_2 reaching a second device arranged downstream of the first device. Active control of the first impact may, according to different embodiments of the present invention, be carried out through active control of the dosage of additive at the first device and/or through active control of an exhaust environment, comprising, for example, a temperature for the exhaust stream at the first device.
EFFECT: device and method for impacting the amount of nitrogen oxides in the exhaust gases from an internal combustion engine are provided.
58 cl, 5 dwg
