In the last decade virtual system integration and electrification have enabled an important change in automotive. The new technology and the attention about the environment, and renewable energy an increase in the use of electric power on road transports. The electrification process represents an important growth, and the introduction of Mild Hybrid Electric Vehicles (MHEVs) is an effective solution to minimize and control the emission. In this paper, authors present the architecture used and the significant parameter considered. The preliminary results include the simulation of emission based on the New European Urban Cycle (NEDC) chosen as target testing cycle.