Use of Detergent Additives For Reducing a Particle Amount in the Exhaust Gas of Direct Injection Diesel Engines

Abstract

The present invention relates to the use of detergent additives for reducing or preventing the formation of deposits in the injection systems of direct-injection diesel engines and in particular in common rail injection systems.

1 - 6 . (canceled) 
   
   
       7 . A fuel additive composition for reducing the amount of particles in exhaust gas emissions of direct-injection diesel engines consisting of at least one detergent additive and optionally at least one carrier oil. 
   
   
       8 . The fuel additive composition of  claim 7  wherein the detergent additive comprises the reaction product of alkyl- or alkenyl-substituted succinic acid or a derivative thereof with an amine. 
   
   
       9 . The fuel additive composition of  claim 8  wherein the detergent additive comprises polyisobutenyl-substituted succinimide. 
   
   
       10 . The fuel additive composition of  claim 7  wherein the detergent additive is in combination with at least one carrier oil. 
   
   
       11 . A method for reducing the amount of particles in exhaust gas emissions of direct-injection diesel engines comprising the addition to the fuel of an additive composition consisting of at least one detergent additive and optionally at least one carrier oil. 
   
   
       12 . The method according to  claim 11  wherein the diesel engine is one equipped with a common rail injection system. 
   
   
       13 . The method according to  claim 11  wherein the detergent additive comprises the reaction products of alkyl- or alkenyl-substituted succinic acids or derivatives thereof with amines. 
   
   
       14 . The method according to  claim 11  wherein the detergent additive comprises polyisobutenyl-substituted succinimides. 
   
   
       15 . The method according to  claim 11  wherein the detergent additive is in combination with at least one carrier oil. 
   
   
       16 . The method according to  claim 11  wherein the amount of particles present in the exhaust gas emissions of the diesel engine, measured directly downstream of the engine after 100,000 km of engine operation, is higher by a factor of at most 2.5 than at the factory adjustment, and the limiting value for the amount of particles of the Euro 4 standard is simultaneously not exceeded.