Method for operating a particle filter taking the ash quantity into consideration

A method for operating a particulate filter taking the ash quantity into consideration and/or for determining the ash quantity in a particulate filter of an exhaust gas aftertreatment system of an internal combustion engine,

• wherein, during the operation of the internal combustion engine, lubricants from the internal combustion engine and/or fuel are at least partially converted into ash,
• and wherein a first ash value is calculated on the basis of the fuel and/or lubricant consumption of the internal combustion engine,
• wherein
• after regeneration of the particulate filter, the differential pressure across the particulate filter is determined,
• a second ash value is calculated on the basis of the determined differential pressure,
• the ash quantity in the particulate filter is determined from the first and the second ash value,
• and, when the determined ash quantity exceeds a predefined value, a status indicator is activated;
• wherein the exhaust gas temperature after leaving the internal combustion engine and on entering the particulate filter is taken into consideration when calculating the first and second ash value, wherein a temperature upstream of the particulate filter is used for the calculation;
• and wherein a filter substrate temperature model is used for the calculation.