Method for operating an internal combustion engine

Abstract

In a method for operating an internal combustion engine comprising at least one a cylinder with a combustion chamber, wherein by means of at least one detection device assigned to the combustion chamber a first value characterizing the pressure in the combustion chamber is detected, wherein on the basis of the first value at least a second value characterizing a progression of the energy released during a combustion in the combustion chamber is determined, on the basis of the second value at least a third value is determined, by means of which the progression of the combustion is subdivided into at least two sub-curves and one of the sub-curves is assigned to a normal combustion for operation of the internal combustion engine and the other of the sub-curves is assigned to a special combustion differing from the normal combustion.

1 . A method for operating an internal combustion engine comprising at least one cylinder with a combustion chamber and at least one detection device assigned to the combustion chamber, the method comprising the steps of:
 determining a first value characterizing a pressure in the combustion chamber, and   on the basis of the first value determining at least a second value ( 16 ) characterizing a curve of the energy values released during a combustion in the combustion chamber,   then on the basis of the second value ( 16 ) determining at least a third value ( 18 ) by which the progression of the combustion is subdivided into at least two sub-curves ( 20 ,  22 ), and   assigning one of the sub-curves ( 20 ,  22 ) to a normal combustion for operation of the internal combustion engine and assigning the other of the sub-curves ( 20 ,  22 ) to a special combustion differing from the normal combustion.   
     
     
         2 . The method according to  claim 1 , wherein the two sub-curves ( 20 ,  22 ) are characterized respectively by first and second further values ( 24 ,  26 ). 
     
     
         3 . The method according to  claim 1 , wherein the third value ( 18 ) is fed to at least one closed control circuit. 
     
     
         4 . The method according to  claim 2 , wherein the second further value ( 26 ) is fed to at least one closed control circuit. 
     
     
         5 . The method according to  claim 1 , wherein the first and second further values ( 24 ,  26 ) are fed to at least two combined interacting control circuits. 
     
     
         6 . The method according to  claim 5 , wherein a stabilization of the combustion is carried out depending on at least one of the third value ( 18 ) and the further values ( 24 ,  26 ). 
     
     
         7 . The method according to  claim 6 , wherein, depending on at least one of the third value ( 18 ) and the further values ( 24 ,  26 ), a continuously controlled transition between two different operating states of the internal combustion engine is carried out. 
     
     
         8 . The method according to  claim 1 , wherein a heating curve, in particular an integral heating curve, is determined as the second value ( 16 ). 
     
     
         9 . The method according to  claim 1 , wherein the special combustion represents one of a regeneration of an exhaust gas purification device, a warm running operation and similar.