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A method and a device for controlling an exhaust gas aftertreatment system, in which a first state variable characterizes the state of the exhaust gas aftertreatment system. A second state variable takes into consideration additional influences on the special operating state. A special operating sta

A method and a device for controlling an exhaust gas aftertreatment system, in which a first state variable characterizes the state of the exhaust gas aftertreatment system. A second state variable takes into consideration additional influences on the special operating state. A special operating state is initiated as a function of the first and the second state variable.

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What is claimed is: 1. A method for controlling a regeneration of a particulate filter in an exhaust gas aftertreatment system of an internal combustion engine, comprising: ascertaining a first state variable that characterizes a state of the exhaust gas aftertreatment system; ascertaining a second

What is claimed is: 1. A method for controlling a regeneration of a particulate filter in an exhaust gas aftertreatment system of an internal combustion engine, comprising: ascertaining a first state variable that characterizes a state of the exhaust gas aftertreatment system; ascertaining a second state variable that takes into consideration a further influence on a special operating state; in the case of a first value of the first state variable, initiating the special operating state as a function of the first state variable and the second state variable; and in the case of a second value of the first state variable, initiating the special operating state at all values of the second state variable; wherein the second state variable characterizes a state of at least one of the internal combustion engine, an environmental condition, and a type of driver. 2. The method as recited in claim 1, wherein: as a function of at least one of the first state variable and the second state variable, different special operating states are initiated. 3. The method as recited in claim 1, further comprising: determining the first state variable as a function of at least one of a measured variable and a control variable. 4. The method as recited in claim 1, wherein: the second state variable is specifiable from at least one variable that characterizes at least one of a rotational speed of the internal combustion engine, a fuel injection quantity, a load, an exhaust gas volume flow, a temperature magnitude, a driving speed, and a time since a preceding special operating state. 5. The method as recited in claim 1, wherein: a threshold value is specifiable as a function of the second state variable, and the special operating state is at least one of initiated and ended as a function of the threshold value. 6. The method as recited in claim 1, wherein: as a function of the first state variable and the second state variable, a figure of merit is specifiable, and as a function of a value of the figure of merit, the special operating state is initiated. 7. The method as recited in claim 1, wherein: a fuzzy logic initiates the special operating state as a function of one of: at least one of the first state variable and the second state variable, and a variable interpreted for a formation of one of the first state variable and the second state variable. 8. The method as recited in claim 1, wherein a threshold value for a pressure loss in the exhaust gas system is measured as a function of a parameter of the engine in a non-loaded and a loaded state and is stored in a characteristics map, and a number of exceeding incidents in which the threshold value is exceeded is summed up, so that individual stochastic exceeding incidents of the threshold value do not result in an undesired initiating of the special operating state. 9. The method as recited in claim 8, wherein the parameter of the engine is a rotational speed. 10. The method as recited in claim 8, wherein the special operating state includes a regeneration of the exhaust gas aftertreatment system. 11. The method as recited in claim 1, wherein: the exhaust gas aftertreatment system includes the particulate filter. 12. The method as recited in claim 11, wherein: the regeneration of the particulate filter is carried out as the special operating state. 13. The method as recited in claim 1, wherein: a number of exceeding incidents is a further state variable characterizing the special operating state, if the number of exceeding incidents is less than a first threshold value, the special operating state is not initiated, if the number of exceeding incidents is more than the first threshold value but less than a second threshold value, the special operating state is able to be initiated, and if the number of exceeding incidents is greater than the second threshold value, the special operating state is initiated. 14. The method as recited in claim 13, wherein: if the special operating state is initiated, another number of the exceeding incidents is checked using a minimum threshold, if the another number of the exceeding incidents is less than the first threshold value, the special operating state is continued, if the another number of the exceeding incidents is greater than the first threshold value and less than the second threshold value, the special operating state ends, and if the another number of exceeding incidents is greater than the second threshold, a fault is detected. 15. The method as recited in claim 14, wherein the special operating state includes a regeneration of the exhaust gas aftertreatment system. 16. A device for controlling a regeneration of a particulate filter in an exhaust gas aftertreatment system of an internal combustion engine, comprising: an arrangement for ascertaining a first state variable that characterizes a state of the exhaust gas aftertreatment system; an arrangement for ascertaining a second state variable that takes into consideration a further influence on a special operating state; an arrangement for, in the case of a first value of the first state variable, initiating the special operating state as a function of the first state variable and the second state variable; and an arrangement for, in the case of a second value of the first state variable, initiating the special operating state at all values of the second state variable; wherein the second state variable characterizes a state of at least one of the internal combustion engine, an environmental condition, and a type of driver. 17. The device as recited in claim 16, wherein a threshold value for a pressure loss in the exhaust gas system is measured as a function of a parameter of the engine in a non-loaded and a loaded state and is stored in a characteristics map, and a number of exceeding incidents in which the threshold value is exceeded is summed up, so that individual stochastic exceeding incidents of the threshold value do not result in an undesired initiating of the special operating state. 18. The device as recited in claim 17, wherein the parameter of the engine is a rotational speed. 19. The device as recited in claim 17, wherein the special operating state includes a regeneration of the exhaust gas aftertreatment system. 20. The device as recited in claim 16, wherein: a number of exceeding incidents is a further state variable characterizing the special operating state, if the number of exceeding incidents is less than a first threshold value, the special operating state is not initiated, if the number of exceeding incidents is more than the first threshold value but less than a second threshold value, the special operating state is able to be initiated, and if the number of exceeding incidents is greater than the second threshold value, the special operating state is initiated. 21. The device as recited in claim 20, wherein: if the special operating state is initiated, another number of the exceeding incidents is checked using a minimum threshold, if the another number of the exceeding incidents is less than the first threshold value, the special operating state is continued, if the another number of the exceeding incidents is greater than the first threshold value and less than the second threshold value, the special operating state ends, and if the another number of exceeding incidents is greater than the second threshold, a fault is detected. 22. The device as recited in claim 21, wherein the special operating state includes a regeneration of the exhaust gas aftertreatment system.