Emissions and Fuel Consumption Potential of a Mild-Hybrid-Diesel-Powertrain with a Pre-Turbine Exhaust Aftertreatment

Autoren

Dr.-Ing. Markus Schönen, Dr.-Ing. Joschka Schaub, Dr. Lynzi Robb, Dr.-Ing. Michael Fiebig, Dipl.-Ing. (FH) Holger Reinwald, Dipl.-Ing. Bernd Lindemann, FEV Europe GmbH, Aachen

Zusammenfassung

The potential to achieve a simultaneous reduction in both NOx and CO₂ emissions via fitting of a pre-turbine exhaust aftertreatment system (PT-EATS) in combination with a mild hybrid concept was investigated via simulation. A vehicle demonstrator was set up in parallel after a detailed hardware concept assessment which contained an electric assisted turbocharger. Furthermore the operating strategies for recuperation and turbocharger control were determined. The target system performance was defined with limit value of 35 mg/km for NOx together with a CF of 1 to be achieved over two WLTC-low cycles. Additionally, representative real driving cycles were investigated via simulating many driving profiles, including short & long driving distances, low & high load operation, stop & go sections as well as urban driving. The optimized pre-turbine EATS layout achieves the target emissions in all driving cycles, except the high-speed highways cycle. The fuel consumption penalties for engine heating for the pre-turbine EATS are in the range of 2 to 4 %. Moreover the total fuel consumption in comparison to a standard Diesel powertrain reduced by 13 to 26 % in urban driving cycles; this shows the large potential of the pre-turbine EATS concept with hybridization.

Mitglieder-Login