Process for operating an engine supplied with a fuel containing a catalyst for regenerating a particulate filter

Abstract

The invention relates to a process for operating an internal combustion engine of a vehicle equipped with an exhaust system comprising a catalysed particulate filter in which the engine is supplied with a fuel containing a catalyst for regenerating the particulate filter. The process is characterized in that the concentration of catalyst in the fuel varies discontinuously.

1 . A method for operating an internal combustion of a vehicle equipped with an exhaust system comprising a catalyzed particulate filter, the method comprising supplying the engine with a fuel containing a catalyst for regenerating the particulate filter, characterized in that the catalyst concentration in the fuel varies discontinuously. 
     
     
         2 . The method as claimed in  claim 1 , wherein the catalyst concentration in the fuel increases only once during a particulate filter charging period. 
     
     
         3 . The method as claimed in  claim 1 , wherein the catalyst concentration in the fuel increases several times during a particulate filter charging period. 
     
     
         4 . The method as claimed in  claim 1 , wherein the catalyst concentration in the fuel decreases once or several times during a particulate filter charging period. 
     
     
         5 . The method as claimed in  claim 1 , wherein the catalyst concentration in the fuel increases or decreases several times during a particulate filter charging period. 
     
     
         6 . The method as claimed in  claim 1 , characterized in that the catalyst that regenerates the particulate filter takes the form of a colloidal dispersion. 
     
     
         7 . The method as claimed in  claim 6 , characterized in that the colloids of the colloidal dispersion are based on a compound of a rare earth; a compound of a metal which is chosen from groups IIA, IVA, VIIA, VIII, IB, IIB, IIIB and IVB of the periodic classification; or a mixture thereof. 
     
     
         8 . The method as claimed in  claim 7 , characterized in that the colloids of the colloidal dispersion are based on a compound of cerium and/or iron. 
     
     
         9 . The method as claimed in  claim 6 , characterized in that the colloidal dispersion contains a detergent composition. 
     
     
         10 . The method as claimed in  claim 8 , characterized in that the colloidal dispersion is based on a compound of iron, an amphiphilic agent and a detergent composition containing a quaternary ammonium salt. 
     
     
         11 . The method as claimed in  claim 2 , characterized in that the catalyst that regenerates the particulate filter takes the form of a colloidal dispersion, wherein the colloids of the colloidal dispersion are based on a compound of a rare earth; a compound of a metal which is chosen from groups IIA, IVA, VIIA, VIII, IB, IIB, IIIB and IVB of the periodic classification; or a mixture thereof. 
     
     
         12 . The method as claimed in  claim 11 , characterized in that the colloids of the colloidal dispersion are based on a compound of cerium and/or iron. 
     
     
         13 . The method as claimed in  claim 3 , characterized in that the catalyst that regenerates the particulate filter takes the form of a colloidal dispersion, wherein the colloids of the colloidal dispersion are based on a compound of a rare earth; a compound of a metal which is chosen from groups IIA, IVA, VIIA, VIII, IB, IIB, IIIB and IVB of the periodic classification; or a mixture thereof. 
     
     
         14 . The method as claimed in  claim 13 , characterized in that the colloids of the colloidal dispersion are based on a compound of cerium and/or iron. 
     
     
         15 . The method as claimed in  claim 4 , characterized in that the catalyst that regenerates the particulate filter takes the form of a colloidal dispersion, wherein the colloids of the colloidal dispersion are based on a compound of a rare earth; a compound of a metal which is chosen from groups IIA, IVA, VIIA, VIII, IB, IIB, IIIB and IVB of the periodic classification; or a mixture thereof. 
     
     
         16 . The method as claimed in  claim 15 , characterized in that the colloids of the colloidal dispersion are based on a compound of cerium and/or iron. 
     
     
         17 . The method as claimed in  claim 5 , characterized in that the catalyst that regenerates the particulate filter takes the form of a colloidal dispersion, wherein the colloids of the colloidal dispersion are based on a compound of a rare earth; a compound of a metal which is chosen from groups IIA, IVA, VIIA, VIII, IB, IIB, IIIB and IVB of the periodic classification; or a mixture thereof. 
     
     
         18 . The method as claimed in  claim 17 , characterized in that the colloids of the colloidal dispersion are based on a compound of cerium and/or iron.