Process Improvement Within an Advanced Car Diesel Engine in Base on the Variability of a Concentric Cam System

The process improvement within an advanced car diesel engine is strongly focused on the scavenging technique, on the mixture formation strategy using direct fuel injection as well as on the combustion control. The paper presents the potentials of process improvement by the variability of the scavenging timing combined with an adaptation of gas exchange, injection and mixture formation parameters. The scavenging timing is controlled by a new developed concentric cam system. The analysis is based on a combined 1D/3D simulation of the thermodynamic process stages within the engine with model calibration by numerous experimental results. The paper presents the effects of cam profile variation and camshaft phasing for two part load operating points of NEDC (New European Driving Cycle). Compared results are presented in terms of swirl rates, fuel distribution, combustion temperature, NO_X and soot curves.