Method for the model-based determination of the temperature distribution of an exhaust aftertreatment unit

摘要

In a method for model-based determination of the temperature distribution of an aftertreatment unit for exhaust gas, a distinction is made between stationary and unsteady operating states, taking into account the axial and radial temperature distribution, and based on a virtual segmentation of the aftertreatment unit, the radial heat transfer in particular is based on the model-based determination for stationary operating states to the environment via a heat transfer coefficient Rc and, for transient operating states, the heat transfer from the exhaust gas flowing axially through the aftertreatment unit to the segments is taken into account via a heat transfer coefficient k.