A Global-Local Emission-Model for NO_x and Soot Emissions of Turbocharged CR-Diesel Engines

Stationary and dynamic models for the emissions of a CR-Diesel engine are developed using a global-local model approach. Results for the NO_x and soot emissions are presented. All model inputs are measurable air path states and combustion parameters. They determine the emission formation before the combustion takes place. Therefore the model can be used for emission prediction and simulation. The combustion process is regarded as a batch process, such that the dynamics are introduced as external dynamics to the model via the inputs. Thus a stationary model structure can be applied. As the space of possible air path states varies widely for different engine operation points, several input and output transformations are given that linearize the input and output space. This improves the model quality and extends the operation range of the model. Modeling results are shown for stationary and dynamic data as well as for local and global model operation.