Patent ID: 6990804

Claim:
A combination exhaust gas post treatment/muffler device in the exhaust gas section of an internal combustion engine, comprising: a muffler that is spatially delimited by a front end wall, a rear end wall, and a peripheral outer wall, wherein said muffler is provided with an inlet tube for receiving exhaust gas that is to undergo post treatment; at least one preliminary oxidation catalytic converter that is disposed in an interior of said muffler and significantly increases an amount of NO 2 in exhaust gas flowing through said muffler; at least one particle separator disposed in said interior of said muffler, wherein after flowing through said at least one preliminary oxidation catalytic converter and said at least one particle separator, exhaust gas, in a clean and indirectly muffled state, is adapted to be conveyed out of said muffler; wherein a free exhaust gas inlet surface of said at least one catalytic converter is considerably smaller than a free exhaust gas inlet surface of said at least one particle separator; wherein an aspect ratio AR=I/Ø eff of said at least one preliminary oxidation catalytic converter is approximately between 0.4 and 0.6; wherein an aspect ratio AR=I/Ø eff of said at least one particle separator 16 is approximately between 0.5 and 1.0; wherein a volume of said at least one preliminary oxidation catalytic converter is between approximately 2.5 and 4 liters, wherein a volume of said at least one particle separator is between approximately 5.5 and 22 liters, and wherein a ratio of the volume of said at least one catalytic converter to the volume of said at least one particle separator is between approximately 0.15 and 0.55; wherein a ratio of the aspect ratio of said at least one particle separator 16 to the aspect ratio of said at least one preliminary oxidation catalytic converter is between approximately 1.05 and 2.2; and wherein at a maximum exhaust gas volume of flow (Nm 3 /h) a channel velocity in said at least one preliminary oxidation catalytic converter is greater than 8 m/sec and in said at least one particle separator is greater than 5 m/sec, wherein the maximum exhaust gas volume flow is delimited by a maximum permissible pressure loss, and a maximum permissible exhaust gas counter pressure with respect to a functionality of the internal combustion engine supplying exhaust gas.