Method and device for the exhaust-gas aftertreatment of an internal combustion engine

Abstract

The invention relates to a method for the exhaust-gas aftertreatment of an internal combustion engine (), and to an internal combustion engine () having an exhaust-gas aftertreatment device for carrying out a method of said type. The internal combustion engine () is supplied with fresh air by way of a compressor (), has an adjustable valve control means () for the inlet valves () and/or the outlet valves (), and is connected to an exhaust duct (), wherein, in the exhaust duct (), there is arranged a first three-way catalytic converter (), and an injection valve () for introducing fuel into the exhaust duct () is arranged, as viewed in the flow direction of an exhaust gas of the internal combustion engine (), downstream of an outlet () of the internal combustion engine () and upstream of the first three-way catalytic converter (). The method comprises the following steps:—operating the internal combustion engine () in a scavenging mode,—introducing a superstoichiometric exhaust gas into the exhaust duct (),—metering fuel into the exhaust duct () upstream of the first three-way catalytic converter () such that a stoichiometric exhaust gas is realized at the inlet of the first three-way catalytic converter (), and—performing aftertreatment of the stoichiometric exhaust gas by way of the first three-way catalytic converter ().