Exhaust gas after-treatment arrangement and method for operating such an arrangement

Abstract

Exhaust gas after-treatment arrangement and method for operating an exhaust gas after-treatment arrangement The invention relates to an exhaust gas after-treatment arrangement having an exhaust line 1 and at least one exhaust gas after-treatment device 2, which has a honeycomb body 5 forming a flow surface for the exhaust gas. The honeycomb body 5 is a hollow cylinder having a central channel 7, wherein the one movable element 9, 15 is arranged in such a way that the movable element can be moved between two end positions, wherein in the first end position a larger cross section of the channel 7 is exposed than in the second end position.

1 - 20 . (canceled) 
     
     
         21 . An exhaust gas after-treatment assembly comprising:
 an exhaust line ( 1 ); and   at least a first exhaust gas after-treatment device ( 2 ) having a honeycomb body ( 5 ) forming a flow surface for the exhaust gas,   wherein the honeycomb body ( 5 ) is a hollow cylinder having a central channel ( 7 ) having an inlet ( 7 ), a movable dement ( 9 ,  15 ) is arranged such that the movable element ( 9 ,  15 ) is movable between first and second end positions, wherein when the movable element ( 9 ,  15 ) is in the first end position a larger cross section of the channel ( 7 ) is exposed than when the movable element ( 9 ,  15 ) is in the second end position.   
     
     
         22 . The exhaust gas after-treatment assembly as claimed in  claim 21 , wherein the first end position exposes at least 75% of the channel cross section. 
     
     
         23 . The exhaust gas after-treatment assembly as claimed in  claim 22 , wherein the second end position closes at least 75% of the channel cross section. 
     
     
         24 . The exhaust gas after-treatment assembly as claimed in  claim 21 , wherein the first end position exposes at least 75% of the channel cross section. 
     
     
         25 . The exhaust gas after-treatment assembly as claimed in  claim 21 , wherein the movable element ( 9 ) is movable in a rotary manner. 
     
     
         26 . The exhaust gas after-treatment assembly as claimed in  claim 25 , wherein the movable element is a rotatable flap ( 9 ). 
     
     
         27 . The exhaust gas after-treatment assembly as claimed in  claim 24 , wherein the movable element ( 15 ) is movable in translation. 
     
     
         28 . The exhaust gas after-treatment assembly as claimed in  claim 27 , wherein the movable element is a slide ( 15 ). 
     
     
         29 . The exhaust gas after-treatment assembly as claimed in  claim 27 , wherein the movable element is a rigid slide ( 15 ). 
     
     
         30 . The exhaust gas after-treatment assembly as claimed in  claim 27 , wherein the movable element is a flexible slide. 
     
     
         31 . The exhaust gas after-treatment assembly as claimed is  claim 27 , wherein the movable element comprises a plurality of movable blades. 
     
     
         32 . The exhaust gas after-treatment assembly as claimed in  claim 21 , wherein the movable element ( 9 ,  15 ) is held and/or guided in the honeycomb body ( 5 ). 
     
     
         33 . The exhaust gas after-treatment assembly as claimed in  claim 31 , wherein 
       the movable element ( 9 ,  15 ) is held and/or guided in the exhaust line ( 1 ). 
     
     
         34 . The exhaust gas after-treatment assembly as claimed in  claim 21 , wherein the movable element ( 9 ,  15 ) is arranged in a region of the inlet ( 8 ) of the channel ( 7 ) in the flow direction. 
     
     
         35 . The exhaust gas after-treatment assembly as claimed in  claim 33 , wherein the movable element ( 9 ,  15 ) is arranged in the region of an outlet ( 13 ) of the channel ( 7 ) in the flow direction. 
     
     
         36 . The exhaust gas after-treatment assembly as claimed in  claim 21 , further comprising an electric motor ( 11 ) configured to drive the movable element ( 9 ,  15 ). 
     
     
         37 . The exhaust gas after-treatment assembly as claimed in  claim 21 , further comprising a connecting rod ( 16 ) that is subjected to pressure and a spring force and is connected to the movable element ( 9 ,  15 ). 
     
     
         38 . The exhaust gas after-treatment assembly as claimed in  claim 21 , further comprising a second exhaust gas after-treatment device arranged downstream of the first exhaust gas after-treatment device. 
     
     
         39 . A method for operating an exhaust gas after-treatment assembly as claimed in  claim 21 , comprising:
 moving the movable element toward the second end position in the case of low exhaust gas flows; and   moving the movable element toward the first end position in the case of higher exhaust gas flows.   
     
     
         40 . The method as claimed in  claim 29 , wherein the movable element is movable into intermediate positions between the first and second end positions.