1D engine simulation approach for optimizing engine and exhaust aftertreatment thermal management for passenger car diesel engines by means of variable valve train (VVT) applications
The cold start and heating phase of passenger car diesel engines is essential to comply with the actual emission legislation targets. The initially low temperature level of the exhaust gas aftertreatment system components results in a very low conversion efficiency. Therefore, the authors have investigated the potential of valve train variabilities systematically in terms of pollutants and CO2 emission reduction as well as to support the heating behavior of the exhaust gas aftertreatment system on a full size engine and demonstrator vehicle. Within these investigations, an extended engine speed and load range has been considered relevant for real driving operation. This publication deals with the introduction of a new approach of 1D engine simulation modelling for full-transient engine operation. It merges the engine process together with the aftertreatment simulation in the diesel engine development.