Method for the closed-loop control of the regeneration of a particle filter

Abstract

The invention concerns a method for the closed-loop control of the regeneration of a particle filter in the exhaust gas system of an internal combustion engine, wherein the burn-off of particles in the particle filter during a regeneration process is controlled by a closed-loop control of the oxygen content of the exhaust gas and/or wherein the temperature of the exhaust gas or of at least one component of the exhaust gas aftertreatment system is controlled in a closed loop. Provision is thereby made for the corrective controller actions for the closed-loop control of the oxygen content and/or the temperature of components of the exhaust gas aftertreatment system to take place only during stable combustion conditions of the internal combustion engine. The method prevents through corrective controller actions during insufficiently stable combustion conditions of the internal combustion engine conditions in the exhaust gas aftertreatment system of the internal combustion engine from being produced, which lead to an inadmissibly high temperature of individual components of the exhaust gas aftertreatment system.

1 . A method of regenerating a particle filter in an exhaust gas system of an internal combustion engine, the method comprising:
 controlling a burn-off of particles in the particle filter by a closed-loop control of the exhaust gas oxygen content;   controlling a temperature of the exhaust gas or a temperature at least one component of an exhaust gas aftertreatment system; and   if stable combustion conditions of the internal combustion engine exist, providing corrective controller actions to control the oxygen content in a closed loop or to control the temperature of the exhaust gas aftertreatment system.   
   
   
       2 . A method according to  claim 1 , wherein a regeneration process of the particle filter only takes place at stable combustion conditions of the internal combustion engine. 
   
   
       3 . A method according to  claim 1 , further comprising establishing a state of stable combustion conditions of the internal combustion engine by switching a status of a glow plug system. 
   
   
       4 . A method according to  claim 1 , further comprising using a stability of a rotational speed of the internal combustion engine to detect stable combustions conditions of the internal combustion engine. 
   
   
       5 . A method according to  claim 1 , wherein a body material of the particle filter is cordierite.