METHOD FOR OPERATING AN EXHAUST GAS AFTERTREATMENT, DEVICE FOR CONTROLLING AN EXHAUST GAS AFTERTREATMENT, EXHAUST GAS AFTERTREATMENT, AND INTERNAL COMBUSTION ENGINE HAVING EXHAUST GAS AFTERTREATMENT

摘要

The invention relates to a method and a device for operating an exhaust gas aftertreatment (300), wherein a diesel particulate filter (DPF) is regenerated during the operation, in particular passively regenerated, wherein a corrected differential pressure (&Dgr;&Rgr;) is calculated from a current differential pressure (&Dgr;&Rgr;) across the diesel particulate filter (DPF) at a current exhaust gas volumetric flow rate (V_AG) and with a current correction factor. According to the invention, the current correction factor is determined by determining a lower differential pressure in a predetermined time interval at a defined exhaust gas volumetric flow rate, in particular in a specified exhaust gas volumetric flow rate interval around the defined exhaust gas volumetric flow rate (V_AG), and comparing the lower differential pressure with a specified current reference value and, depending thereon, calculating a new correction factor or retaining the previous correction factor as the current correction factor.