Exhaust system of an internal combustion engine

Abstract

An exhaust system of an internal combustion engine, in particular of a vehicle, has an insert through which exhaust gas flows, for purifying the exhaust gas, and a mixing chamber through which exhaust gas flows and which is arranged upstream of the insert through which exhaust gas flows. The mixing chamber includes at least one permeable wall and is arranged on a channel wall of the exhaust system and protrudes radially into the interior of the exhaust system. The exhaust system further has a vaporizer device that vaporizes an oxidizable liquid and introduces the vapor into the mixing chamber, and an ignition device that protrudes at least partly into the mixing chamber. The vaporizer device includes a glow element which is configured and heatable in such a way that an auto-ignition of the oxidizable vapor occurs on its surface.

1 . An exhaust system of an internal combustion engine, comprising:
 a channel;
 an insert for purifying exhaust gas within said channel; 
 a mixing chamber arranged upstream of said insert; 
 a vaporizer device vaporizing an oxidizable liquid and introducing generated oxidizable vapor into said mixing chamber; and 
 an ignition device protruding at least partly into said mixing chamber, said exhaust gas flowing along said channel through said insert and said mixing chamber, said mixing chamber including at least one permeable wall and being arranged on a channel wall and protruding radially into an interior of said exhaust system, and said vaporizer device including a glow element heatable in such a way that an auto-ignition of oxidizable vapor occurs on a surface of the glow element. 
   
   
   
       2 . The exhaust system according to  claim 1 , wherein said ignition device includes one or more ignition electrodes producing an ignition spark for ignition of the oxidizable vapor. 
   
   
       3 . An exhaust system of an internal combustion engine, comprising:
 a channel;   an insert for purifying exhaust gas within said channel;   a mixing chamber arranged upstream of said insert;   a vaporizer device vaporizing an oxidizable liquid and introducing generated oxidizable vapor into said mixing chamber; and   an ignition device protruding at least partly into said mixing chamber, said exhaust gas flowing along said channel through said insert and said mixing chamber, said mixing chamber including at least one permeable wall and being arranged on a channel wall and protruding radially into an interior of said exhaust system, and said ignition device including at least one ignition electrode producing an ignition spark for ignition of said oxidizable vapor.   
   
   
       4 . The exhaust system according to  claim 3 , wherein said at least one ignition electrode is arranged on a channel wall section located radially opposite to said mixing chamber. 
   
   
       5 . The exhaust system according to  claim 3 , wherein said at least one ignition electrode is a spark plug. 
   
   
       6 . The exhaust system according to  claim 5 , wherein at least one opening is provided on said channel wall of said exhaust system, said at least one spark plug protruding through said at least one opening into a gas guiding channel. 
   
   
       7 . The exhaust system according to  claim 3 , wherein said ignition spark is produced between two electrodes. 
   
   
       8 . The exhaust system according to  claim 7 , wherein said ignition spark is in one of a substantially transverse and perpendicular orientation to an inflow direction of said oxidizable liquid into said mixing chamber. 
   
   
       9 . The exhaust system according to  claim 1 , including an electronic controller for at least one of said ignition device and said vaporizer device. 
   
   
       10 . The exhaust system according to  claim 9 , wherein said electronic controller drives at least one of said ignition device and said vaporizer device for igniting said vapor depending on at least one of a temperature and exhaust gas flow. 
   
   
       11 . The exhaust system according to  9 , wherein said electronic controller means controls the quantity of said vapor introduced into said mixing chamber as a function of at least one of a temperature and exhaust gas flow. 
   
   
       12 . The exhaust system according to  claim 1 , wherein said vaporizer device includes a glow element. 
   
   
       13 . The exhaust system according to  claim 12 , wherein said glow element terminates in a region of, or in, said mixing chamber. 
   
   
       14 . The exhaust system according to  claim 12 , wherein said glow element can be heated to different temperatures, said different temperatures including at least a first temperature level which ensures a vaporization of said oxidizable liquid and a second temperature level which leads to an auto-ignition of said vapor. 
   
   
       15 . The exhaust system according to  claim 1 , wherein said insert includes a diesel particulate filter. 
   
   
       16 . The exhaust system according to  claim 15 , wherein an oxidation catalytic converter is arranged in said insert in a flow direction upstream of said diesel particulate filter. 
   
   
       17 . The exhaust system according to  claim 1 , wherein said oxidizable liquid is a fuel.