Patent ID: 7404290

Claim:
An exhaust system for an internal combustion engine, said system comprising: an exhaust line for discharging exhaust gas from the internal combustion engine; a secondary fuel supply for introducing secondary fuel into the exhaust gas of the internal combustion engine; a recirculation device connected to said exhaust line and to said secondary fuel supply so that the secondary fuel is introduced into the exhaust gas via or through said recirculation device; wherein said recirculation device defines a circulation space; which receives an exhaust gas substream from said exhaust line, in which the secondary fuel is introduced into said exhaust gas substream and from which the modified exhaust gas substream is returned back to said exhaust line, wherein said circulation space is cylindrical and intersects a longitudinal section of said exhaust line, thereby forming a connecting opening; a longitudinal axis of said circulation space runs at an inclination with respect to a longitudinal axis of said longitudinal section; and said connecting opening has an oncoming flow edge over which the exhaust gas substream from said exhaust line enters said circulation space; and wherein said connecting opening has an outgoing flow edge situated in said exhaust line upstream from the oncoming flow edge and via which said modified exhaust substream is recycled from said circulation space into said exhaust line.