EU6 C-Segment Diesel vehicles, a challenging segment to meet RDE and WLTP requirements

The upcoming steps in the emissions legislation in Europe consider a stringent tightening of the procedure to homologate vehicles. The WLTP will be introduced as the type-approval cycle from 2017, substituting the less severe NEDC. On the other hand, real driving emissions (RDE) cycles will also be run under realistic driving conditions: the vehicle must fulfill severe NOx emission targets. At the same time, the minimization of the CO2 emissions is also pursued by the governments. The current work first compares the different emission procedures, later presents the FEV SimEx simulation tool applied to the longitudinal powertrain and aftertreatment simulation of Diesel vehicles, and finally analyses the specific case of the powertrain design of a C-Segment vehicle to meet upcoming RDE and WLTP requirements.