Internal combustion engine with exhaust treatment system

Abstract

An internal combustion engine has an exhaust treatment system for reducing pollutants in the exhaust. The system includes a reservoir containing an active ingredient a delivery device for delivering the active ingredient and an injection device for injecting the active ingredient into the exhaust. According to the present invention, the exhaust treatment system includes a pressure reservoir that is fed by the delivery device; this pressure reservoir is able to store the active ingredient under pressure and is directly connected to the injection device.

1 - 12 . (canceled)  
   
   
       13 . An internal combustion engine, in particular with fuel direct injection, having an exhaust treatment system for reducing pollutants in the exhaust, the exhaust treatment system comprising 
 a reservoir containing an active ingredient,    a delivery device for delivering the active ingredient,    an injection device for injecting the active ingredient into the exhaust, and    a pressure reservoir that is fed by the delivery device    the pressure reservoir being able to store the active ingredient under pressure and being directly connected to the injection device.    
   
   
       14 . The internal combustion engine according to  claim 13 , wherein the delivery device comprises a presupply pump and a high pressure pump.  
   
   
       15 . The internal combustion engine according to  claim 13 , further comprising a pressure regulating device connected to the pressure reservoir.  
   
   
       16 . The internal combustion engine according to  claim 14 , further comprising a pressure regulating device connected to the pressure reservoir.  
   
   
       17 . The internal combustion engine according to  claim 13 , further comprising a control and/or regulating device, which controls and/or regulates the delivery capacity (M_DD) of the delivery device, the pressure (PR_UPR) in the pressure reservoir, the time at which the injection of the active ingredient occurs, and/or the duration (TI_UID) of an injection of the active ingredient as a function of the operating state (N, RA, RF, TMOT, LAMBDA) of the internal combustion engine.  
   
   
       18 . The internal combustion engine according to  claim 16 , further comprising a control and/or regulating device, which controls and/or regulates the delivery capacity (M_DD) of the delivery device, the pressure (PR_UPR) in the pressure reservoir, the time at which the injection of the active ingredient occurs, and/or the duration (TI_UID) of an injection of the active ingredient as a function of the operating state (N, RA, RF, TMOT, LAMBDA) of the internal combustion engine.  
   
   
       19 . The internal combustion engine according to  claim 13 , wherein the delivery device, the pressure reservoir, and/or the injection device are of the type used in direct-injecting, fuel systems.  
   
   
       20 . The internal combustion engine according to  claim 16 , wherein the delivery device, the pressure reservoir, and/or the injection device are of the type used in direct-injecting fuel systems.  
   
   
       21 . The internal combustion engine according to  claim 17 , wherein the delivery device, the pressure reservoir, and/or the injection device are of the type used in direct-injecting fuel systems.  
   
   
       22 . The internal combustion engine according to  claim 13 , wherein the active ingredient is urea.  
   
   
       23 . The internal combustion engine according to  claim 16 , wherein the active ingredient is urea.  
   
   
       24 . The internal combustion engine according to  claim 17 , wherein the active ingredient is urea.  
   
   
       25 . The internal combustion engine according to  claim 22 , further comprising means to heat the pressure reservoir.  
   
   
       26 . A method for operating an internal combustion engine according to  claim 13 , wherein the delivery capacity (M_DD) of the delivery device, the pressure (PR_UPR) in the pressure reservoir, the time at which the injection of the active ingredient occurs, and/or the duration (TI_UID) of the injection of the active ingredient depend on the current operating parameters (N, RA, RF, TMOT, TASP, HASP, TSCR, NOX, LAMDA) of the internal combustion engine.  
   
   
       27 . A method for operating an internal combustion engine according to  claim 17 , wherein the delivery capacity (M_DD) of the delivery device, the pressure (PR_UPR) in the pressure reservoir, the time at which the injection of the active ingredient occurs, and/or the duration (TI_UID) of the injection of the active ingredient depend on the current operating parameters (N, RA, RF, TMOT, TASP, HASP, TSCR, NOX, LAMDA) of the internal combustion engine.  
   
   
       28 . The method according to  claim 26 , wherein the operating parameters include a speed (N) of a crankshaft, a torque of the engine, a fuel mass (RF) injected into a combustion chamber, a temperature (TMOT) of the engine, a temperature (TASP) of the ambient air, a humidity (HASP) of the ambient air, a temperature (TSCR) before and/or after a catalytic converter, an NO x , and/or NH 3  content (NOX) in the exhaust, and/or a fuel/air ratio (LAMBDA) in the combustion chamber or an equivalent value (RA).  
   
   
       29 . A computer program, characterized in that it is programmed to be used in a method according to  claim 26 .  
   
   
       30 . A computer program, characterized in that it is programmed to be used in a method according to  claim 26 .  
   
   
       31 . An electric storage medium for a control and/or regulating unit of an internal combustion engine, operable to store a computer program to be used in a method according to  claim 26 .  
   
   
       32 . A control and/or regulating unit for an internal combustion engine, the unit being programmed to be used to perform the method according to  claim 26.