Abstract: The invention relates to a heating module for an exhaust gas system of an internal combustion engine, said heating module comprising at least one inlet opening and at least one outlet opening by means of which the heating module can be connected to the exhaust gas system, wherein a main line and a secondary line are provided between the inlet opening and the outlet opening to guide an exhaust gas flowing through the heating module, said main line and secondary line being in connection with one another at their upstream ends via a branching section and at their downstream ends via a merging chamber. A control device for controlling the exhaust gas flow flowing through the main line is further provided in the main line. The heating module is characterized in that the heating module comprises an oxidation catalyst that is at least sectionally arranged in the merging chamber. The invention further relates to a corresponding method.

Abstract: The present invention relates to an apparatus for mixing an additive with a gas flow, in particular for an exhaust gas system of a vehicle having an internal combustion engine, that comprises a mixing chamber which can be flowed through by at least a portion of the gas flow, said mixing chamber having at least one inlet opening through which a main inlet flow of the gas flow flows into the mixing chamber on operation of the apparatus, having at least one metering opening and having at least one outlet opening. The apparatus further comprises a metering device by means of which an additive flow of the additive can be introduced into the mixing chamber through the metering opening, wherein the inlet opening and the metering opening are arranged and formed such that the main inlet flow and the additive flow in substantially opposite directions into the mixing chamber so that the main inlet flow and the additive flow impact one another.