Method And Device For Introducing A Reagent Into An Exhaust Gas Channel Of An Internal Combustion Engine

Abstract

A procedure to introduce a reagent substance into the exhaust duct of an internal combustion engine and a device to implement the procedure are proposed. At least one catalytic converter is disposed in the exhaust duct of the internal combustion engine. In front of the aforementioned catalytic converter(s), a reagent substance subjected to pressure is sprayed into the exhaust gas. The reagent substance pressure set point is established as a function of a parameter. The procedural approach allows for a targeted employment of the reagent substance and a high degree of utilization of the converter.

1 . A method for the operation of an internal combustion engine, in whose exhaust area at least one catalytic converters is disposed, the methods comprising introducing a reagent substance into exhaust gas before the catalytic converter wherein a pressure of the reagent substance is determined as a function of a parameter to a predetermined reagent substance set point.  
   
   
       2 . A method according to  claim 1 , wherein at least one operating parameter of the internal combustion engine is used as a parameter.  
   
   
       3 . A method according to  claim 2 , wherein an air signal is used as the operating parameter of the internal combustion engine.  
   
   
       4 . A method according to  claim 2 , wherein the number of revolutions per minute and a torque, or the number of revolutions per minute and a fuel signal are used as operating parameters of the internal combustion engine.  
   
   
       5 . A method according to  claim 1 , wherein a parameter of the exhaust gas of the internal combustion engine is used as a parameter.  
   
   
       6 . A method according to  claim 5 , wherein an exhaust gas speed is used as the parameter.  
   
   
       7 . A method according to  claim 5 , wherein an exhaust gas pressure is used as the parameter of the exhaust gas.  
   
   
       8 . A method according to  claim 5 , wherein an exhaust gas temperature is used as the parameter of the exhaust gas.  
   
   
       9 . A method according to  claim 5 , wherein the parameter of the exhaust gas is derived from at least one operating parameter of the internal combustion engine.  
   
   
       10 . A method according to  claim 1 , wherein a reagent substance temperature is used as the parameter.  
   
   
       11 . A method according to  claim 1 , wherein a pressure of a compressed air, which is added to a reagent substance in a mixer, is established as a function of a parameter to a predetermined compressed air pressure set point.  
   
   
       12 . (canceled)