Method for operating an exhaust gas aftertreatment system, exhaust gas aftertreatment system, and internal combustion engine with an exhaust gas aftertreatment system

Abstract

A method for operating an exhaust gas aftertreatment system, having the following steps: determining a permissible energy input into at least one exhaust gas aftertreatment element of the exhaust gas aftertreatment system; ascertaining a current energy input into the at least one exhaust gas aftertreatment element by ascertaining at least one energy input variable which characterizes the current energy input; and actuating an adjusting device which varies a distribution of an exhaust gas mass flow to the at least one exhaust gas aftertreatment element and a bypass path that runs about the at least one exhaust gas aftertreatment element depending on the permissible energy input and the current energy input.

1 - 9 . (canceled) 
     
     
         10 . A method for operating an exhaust gas aftertreatment system, comprising the steps of:
 determining a permissible energy input into at least one exhaust gas aftertreatment element of the exhaust gas aftertreatment system;   ascertaining an instantaneous energy input into the at least one exhaust gas aftertreatment element by ascertaining at least one energy input variable which characterizes the instantaneous energy input; and   actuating an actuation device which varies, a distribution of an exhaust gas mass flow to the at least one exhaust gas aftertreatment element and varies a bypass path that leads around the at least one exhaust gas aftertreatment element, as a function of the permissible energy input and the instantaneous energy input.   
     
     
         11 . The method according to  claim 10 , including determining the permissible energy input as a function of at least one operating parameter of the at least one exhaust gas aftertreatment element. 
     
     
         12 . The method according to  claim 11 , including determining the permissible energy input as a function of a soot charge of a particle filter, a reducing agent charge of an SCR catalytic converter and/or a hydrocarbon charge of a catalytic converter. 
     
     
         13 . The method according to  claim 10 , wherein an exhaust gas mass flow through the at least one exhaust gas aftertreatment element and/or an exhaust gas temperature are/is ascertained as the energy input variable. 
     
     
         14 . The method according to  claim 13 , including measuring the exhaust gas temperature upstream of the at least one exhaust gas aftertreatment element, downstream of the at least one exhaust gas aftertreatment element, and/or in the at least one exhaust gas aftertreatment element. 
     
     
         15 . The method according to  claim 10 , including ascertaining the exhaust gas mass flow as a function of an instantaneous operating state of an internal combustion engine in combination with which the exhaust gas aftertreatment system is operated, as a function of a pressure loss variable across the at least one exhaust gas aftertreatment element, and/or as a function of a pressure loss variable across at least one actuation element of the actuation device. 
     
     
         16 . An exhaust gas aftertreatment system, comprising:
 at least one exhaust gas aftertreatment element;   a bypass path around the at least one exhaust gas aftertreatment element;   an actuation device, configured to selectively distribute an exhaust gas mass flow to the at least one exhaust gas aftertreatment element and the bypass path; and   a control device having determining means for determining a permissible energy input into the at least one exhaust gas aftertreatment element, ascertaining means for ascertaining an instantaneous energy input into the at least one exhaust gas aftertreatment element, and actuation means for actuating the actuation device, wherein the control device is configured to actuate the actuation device as a function of the permissible energy input and the instantaneous energy input.   
     
     
         17 . The exhaust gas aftertreatment system according to  claim 16 , comprising a plurality of exhaust gas aftertreatment elements, including at least one first exhaust gas aftertreatment element and at least one second exhaust gas aftertreatment element are each assigned a separate bypass path and a separate actuation device. 
     
     
         18 . The exhaust gas aftertreatment system according to  claim 16 , wherein the actuation device has precisely one actuation element for distributing the exhaust gas mass flow. 
     
     
         19 . The exhaust gas aftertreatment system according to  claim 16 , wherein the actuation device has an actuation element in the bypass path and an actuation element upstream of the exhaust gas aftertreatment element, wherein the actuation elements are coupled to one another in opposite directions. 
     
     
         20 . An internal combustion engine, comprising an exhaust gas aftertreatment system according to  claim 16 .