Injection module and exhaust system having an injection module

Abstract

An injection module ( 10 ) for injecting a reducing agent, urea (AdBlue), into the exhaust system ( 22 ) of an internal combustion engine ( 2 ) has at least two outlet openings ( 12 ) for discharging at least one reducing agent la primary stream ( 13 ), the outlet openings ( 12 ) being angled and spaced apart in such a way that the reducing agent primary streams ( 13 ) being discharged from the outlet openings ( 12 ) meet each other so that they largely, but not entirely overlap and thereby achieve a uniform distribution in the spray mist ( 11 ).

1 - 10 . (canceled) 
     
     
         11 . An injection module ( 10 ) for injecting a reducing agent into the exhaust system ( 22 ) of an internal combustion engine ( 2 ), the injection module comprising at least two outlet openings ( 12 ) for discharging at least one reducing agent primary jet ( 13 ) in each case, wherein the outlet openings ( 12 ) are formed in such a way that the reducing agent primary jets ( 13 ) emerging through the outlet openings ( 12 ) meet and produce a spray mist ( 11 ) in the exhaust system ( 22 ), wherein the outlet openings ( 12 ) are formed in such a way that the reducing agent primary jets ( 13 ) emerging through the outlet openings ( 12 ) meet with only a partial overlap, wherein the outlet openings ( 12 ) are formed in such a way that the reducing agent primary jets ( 13 ) meet after a free path length (L) of less than 10 mm. 
     
     
         12 . The injection module ( 10 ) as claimed in  claim 11 , wherein the outlet openings ( 12 ) are formed in a manner offset and/or tilted relative to one another. 
     
     
         13 . The injection module ( 10 ) as claimed in  claim 11 , wherein the overlap is in a range of from 30% to 70% of an area of the primary jets ( 13 ). 
     
     
         14 . The injection module ( 10 ) as claimed in  claim 13 , wherein the overlap is in a range of from 40% to 60% of the area of the primary jets ( 13 ). 
     
     
         15 . The injection module ( 10 ) as claimed in  claim 11 , wherein the outlet openings ( 12 ) are formed in such a way that the reducing agent primary jets ( 13 ) meet at an angle (α) of more than 30°. 
     
     
         16 . The injection module ( 10 ) as claimed in  claim 11 , wherein the free path length (L) is less than 5 mm. 
     
     
         17 . A section of an exhaust system ( 22 ) of an internal combustion engine ( 2 ) having an injection module ( 10 ) for injecting a reducing agent into the exhaust system ( 22 ) of an internal combustion engine ( 2 ), the injection module comprising at least two outlet openings ( 12 ) for discharging at least one reducing agent primary jet ( 13 ) in each case, wherein the outlet openings ( 12 ) are formed in such a way that the reducing agent primary jets ( 13 ) emerging through the outlet openings ( 12 ) meet and produce a spray mist ( 11 ) in the exhaust system ( 22 ), wherein the outlet openings ( 12 ) are formed in such a way that the reducing agent primary jets ( 13 ) emerging through the outlet openings ( 12 ) meet with only a partial overlap, wherein the outlet openings ( 12 ) are formed in such a way that the reducing agent primary jets ( 13 ) meet after a free path length (L) of less than 10 mm. 
     
     
         18 . The section of an exhaust system ( 22 ) as claimed in  claim 17 , having a shielding plate ( 20 ), which is configured and arranged to prevent the spray mist ( 11 ) from striking a wall ( 24 ) of the exhaust system ( 22 . 
     
     
         19 . The section of an exhaust system ( 22 ) as claimed in  claim 17 , wherein an oxidation catalyst ( 4 ) is arranged upstream of the injection module ( 10 ), and a reduction catalyst ( 6 ) is arranged downstream of the injection module ( 10 ). 
     
     
         20 . The section of an exhaust system ( 22 ) as claimed in  claim 17 , having a shielding plate ( 20 ), which is configured and arranged to prevent the spray mist ( 11 ) from striking a wall ( 24 ) of the exhaust system ( 22 ), wherein the shielding plate ( 20 ) has one or more openings ( 16 ). 
     
     
         21 . The section of an exhaust system ( 22 ) as claimed in  claim 17 , wherein an oxidation catalyst ( 4 ) is arranged upstream of the injection module ( 10 ), and a reduction catalyst ( 6 ) is arranged downstream of the injection module ( 10 ), wherein the injection module ( 10 ) is arranged in a connecting duct ( 5 ) between the oxidation catalyst ( 4 ) and the reduction catalyst ( 6 ), and wherein the direction of flow of the exhaust gases is deflected by the connecting duct ( 5 ). 
     
     
         22 . The section of an exhaust system ( 22 ) as claimed in  claim 17 , wherein the outlet openings ( 12 ) are formed in a manner offset and/or tilted relative to one another. 
     
     
         23 . The section of an exhaust system ( 22 ) as claimed in  claim 17 , wherein the overlap is in a range of from 30% to 70% of an area of the primary jets ( 13 ). 
     
     
         24 . The section of an exhaust system ( 22 ) as claimed in  claim 23 , wherein the overlap is in a range of from 40% to 60% of the area of the primary jets ( 13 ). 
     
     
         25 . The section of an exhaust system ( 22 ) as claimed in  claim 17 , wherein the outlet openings ( 12 ) are formed in such a way that the reducing agent primary jets ( 13 ) meet at an angle (α) of more than 30°. 
     
     
         26 . The section of an exhaust system ( 22 ) as claimed in  claim 17 , wherein the free path length (L) is less than 5 mm. 
     
     
         27 . A method of injecting a reducing agent into the exhaust system ( 22 ) of an internal combustion engine ( 2 ), characterized in that the method comprises injecting at least two reducing agent primary jets ( 13 ) into the exhaust system ( 22 ) in such a way that the reducing agent primary jets meet with only a partial overlap in order to produce a reducing agent spray mist ( 11 ) in a region of the exhaust system ( 22 ), wherein the reducing agent primary jets ( 13 ) meet after a free path length (L) of less than 10 mm. 
     
     
         28 . The method as claimed in  claim 27 , wherein the free path length (L) is less than 5 mm.