Apparatus for adjusting the temperature of exhaust gases

Abstract

Apparatus for adjusting the temperature of exhaust gases passing through an exhaust system of a vehicle having an internal combustion engine. The exhaust system is provided with an active regeneration filter for collecting particles from the exhaust gas stream. The apparatus includes a heat exchanger that has a first flow passage for an exhaust gas stream from the exhaust manifold of the engine to the particle filter and a second flow passage for an exhaust gas stream from the particle filter to the outlet pipe of the exhaust system.

1 . An apparatus for adjusting the temperature of exhaust gases passing through an exhaust system ( 11 - 17 ) of a vehicle having an internal combustion engine ( 10 ), which exhaust system is provided with an active regeneration filter ( 14 ) for collecting particles from the exhaust gas stream, and which apparatus comprises a heat exchanger ( 12 ), which has a first flow passage for an exhaust gas stream from the exhaust manifold ( 11 ) of the engine to the particle filter ( 14 ) and a second flow passage for an exhaust gas stream from the particle filter ( 14 ) to the outlet pipe ( 17 ) of the exhaust system, and characterized in that the particle filter ( 14 ) is provided with an oxidation catalyst ( 13 ) for intermittent combustion of accumulated soot.  
   
   
       2 . The apparatus as recited in  claim 1 , further characterized in that the combustion chamber of the engine ( 10 ) is provided with an injector for injecting fuel into the exhaust gases.  
   
   
       3 . The apparatus as recited in  claim 1 , further characterized in that an injector is placed in the exhaust system upstream of the particle filter ( 14 ), for injecting fuel into the exhaust gases.  
   
   
       4 . An apparatus for adjusting the temperature of an exhaust gas stream emanating from an internal combustion engine of a vehicle and passing through an exhaust system thereof, said exhaust system comprising: 
 an active regeneration filter for collecting particles from the exhaust gas stream;    a heat exchanger having a first flow passage for an exhaust gas stream from the exhaust manifold of the engine to the particle filter and a second flow passage for an exhaust gas stream from the particle filter to an outlet pipe of the exhaust system; and    said particle filter being provided with an oxidation catalyst for intermittent combustion of accumulated soot.    
   
   
       5 . The apparatus as recited in  claim 4 , further comprising said internal combustion engine having an injector that injects fuel into the exhaust gases.  
   
   
       6 . The apparatus as recited in  claim 4 , further comprising an injector located in the exhaust system upstream of the particle filter which injects fuel into the exhaust gases.