Device and method for post-engine introduction of an auxiliary agent in an exhaust gas stream

A device for introducing a processing agent downstream of an engine into an exhaust gas of an internal combustion engine flowing one of into an aftertreatment system and into a particle filter, comprising:

• an arrangement for supplying the processing agent;
• a supply apparatus provided with a reciprocally acting arrangement for exciting a gas discharge, wherein:
• an at least partial oxidation of the processing agent is supported prior to entering the aftertreatment system;
• and
• an arrangement for conveying the exhaust gas and via which a reciprocal action of the supply apparatus and the reciprocally acting arrangement for exciting the gas discharge are implemented, wherein:
• the arrangement for conveying the exhaust gas subdivides a region between the supply apparatus and the reciprocally acting arrangement for exciting the gas discharge in such a way that the processing agent first mixes with a portion of an exhaust-gas stream before being conveyed to the reciprocally acting arrangement for exciting the gas discharge,
• the supply apparatus and the reciprocally acting arrangement for exciting the gas discharge are arranged in such a way relative to one another that a supply of the processing agent to the reciprocally acting arrangement for exciting the gas discharge is implemented in a direction that is perpendicular to a flow direction of the exhaust gas,
• the arrangement for conveying the exhaust gas includes three orifices,
• a first orifice of the three orifices conveys a portion of an exhaust-gas flow to the supply apparatus,
• a second orifice of the three orifices conveys a further portion of the exhaust-gas stream to the reciprocally acting arrangement for exciting the gas discharge, and
• a third orifice of the three orifices discharges the exhaust gas mixed with radicals into the aftertreatment system.