An advanced numerical investigation has been carried out in order to study the effect of multiple injection strategies on Caterpillar heavy-duty diesel engine emissions. Both different injected fuel percentages for each pulse and several dwells between main and post phase were investigated via computational fluid dynamics (CFD) and large eddy simulation (LES). Two sets of simulations were taken...

Ignition timing in Homogeneous Charge Compression Ignition (HCCI) engines is dominated by thermo-kinetic reactions that are dependant on the charge properties. A single zone thermodynamic model, coupled to a kinetic mechanism, is developed to predict the ignition timing of Primary Reference Fuels (PRFs) in an HCCI engine. The model, consisting of 120 chemical reactions and 58 species, is valida...

Abstract Knowledge of the NO:NO2 ratio emitted from a diesel engine is particularly important for ensuring highest performance selective catalytic reduction (SCR) NOx after-treatment systems. As real driving emissions vehicles increase in importance, need to understand during transient operation similarly increases. Previous work by authors identified significant differences throughout exhaust ...

Existing and future IMO restrictions on emission of harmful substances contained in exhaust gas have introduced an obligation to implement technical solutions reduce NOX, SOX CO2 emissions. Reduction NOX emissions has been achieved by systems (i.e. SCR EGR) ensuring Tier III-compliant composition. EGR also affected the amount waste heat. Therefore reduction mostly dependent available heat produ...