Particle filter for an internal combustion engine

Abstract

A particle filter for an internal combustion engine has a filter body (2) with a first channel (5) having a first end (7) facing a filter inlet (3) and a second end (8) facing a filter outlet (4), and a flow-through second channel (6) having a third end (9) facing the filter inlet (3) and a fourth end (10) formed facing the filter outlet (4). The second and third ends (8, 9) cannot accommodate flow therethrough. The channels (5, 6) are divided into a flow-through section (13) and a non-flow-through section (14). A wall (11) between the channels (5, 6) enables soot particles to be separated from exhaust gas flowing through the filter body (2) from the first channel (5) into the second channel (6). The non-flow-through channel section (14) has a heating element (15) to increase a reaction temperature in the filter (1) for burning off the soot particles.

1 . A particle filter for an internal combustion engine, having a filter body ( 2 ), wherein the filter body ( 2 ) has a filter inlet ( 3 ) passable by a flow, and a filter outlet ( 4 ) passable by a flow, and wherein the filter body ( 2 ) has at least one first duct ( 5 ) passable by a flow, having a first end ( 7 ) that is configured so as to face the filter inlet ( 3 ), and a second end ( 8 ) that is configured so as to face the filter outlet ( 4 ), and a second duct ( 6 ) passable by a flow, having a third end ( 9 ) that is configured so as to face the filter inlet ( 3 ), and a fourth end ( 10 ) that is configured so as to face the filter outlet ( 4 ), and wherein the second end ( 8 ) and the third end ( 9 ) are configured so as to be impassable by a flow, wherein the ducts ( 5 ,  6 ) are capable of being divided into a duct portion ( 13 ) passable by a flow, and a duct portion ( 14 ) impassable by a flow, and wherein a flow transfer of an exhaust gas flowing through the filter body ( 2 ) proceeding from the first duct ( 5 ) to the second duct ( 6 ) is performed by way of a common duct wall ( 11 ) that is configured between the first duct ( 5 ) and the second duct ( 6 ), and wherein the duct wall ( 11 ) is configured so as to be capable of separating soot particles of the exhaust gas, and wherein:
 the first duct ( 5 ) and/or the second duct ( 6 ) for increasing a reaction temperature present in the particle filter ( 1 ) for burning off the soot particles have/has a heating element ( 15 ), wherein the heating element ( 15 ) is disposed in that duct portion ( 14 ) of the duct ( 5 ;  6 ) that is impassable by a flow and is configured from a functional material which reacts in an exothermicic manner when storing oxygen.   
     
     
         2 . The particle filter of  claim 1 ,
 wherein   the heating element ( 15 ) for the release of heat is excitable with the aid of a modification of a combustion air ratio (λ) of the exhaust gas.   
     
     
         3 . The particle filter of  claim 2 ,
 wherein:   the heating element ( 15 ) for the release of heat is excitable with the aid of a modification of a combustion air ratio (λ) of the exhaust gas from a combustion air ratio (λ) having a value below 1 to a value above 1.   
     
     
         4 . The particle filter of  claim 1 ,
 wherein   the heating element ( 15 ) has an element cross section (QE) which corresponds to a cross section (Q) of the duct ( 5 ,  6 ).   
     
     
         5 . The particle filter of  claim 1 ,
 wherein   the heating element ( 15 ) is configured at least from cerium and zirconium oxides and/or the mixed oxides thereof.   
     
     
         6 . The particle filter of  claim 1   wherein   the heating element ( 15 ) comprises palladium and/or rhodium.   
     
     
         7 . The particle filter of  claim 1 ,
 wherein   the heating element ( 15 ) of the first duct ( 5 ) is configured from a first material, and the heating element ( 15 ) of the second duct ( 6 ) is configured from a second material that is dissimilar to the first material.   
     
     
         8 . The particle filter of  claim 7 ,
 wherein   the first material is configured for reacting at low and medium temperatures present in the particle filter ( 1 ), and the second material is configured for reacting above all temperatures present in the particle filter ( 1 ).   
     
     
         9 . The particle filter of  claim 1 ,
 wherein   a further heating element ( 15 ) is disposed in the duct portion passable by a flow.   
     
     
         10 . The particle filter of  claim 1 ,
 wherein   the duct portion impassable by a flow has a stopper ( 12 ), wherein the heating element ( 15 ) is configured so as to completely or partially replace the stopper ( 12 ).