48V systems enable not only mild hybrid functionalities such as recuperation or torque assist by a belt-driven starter generator (BSG), but also electrification of accessories and the engine boosting system. To maximize the powertrain efficiency, a proper layout of the electrified system and an optimized distribution of the electric power during transient operation is essential. In this study, a vehicle co-simulation of a conventional powertrain with a downsized turbocharged gasoline engine is extended by a 48V system with an electric compressor (eC) and a BSG. The control functions of the eC and BSG are based on a state-of-the-art vehicle application and calibrated for transient operating conditions. The engine model, which is built using a one-dimensional crank angle resolved approach in GT-POWER, has been validated with measurement data and is used to predict the interaction between the eC and the engine air path. The investigations using the simulation platform show that the 48V eC and the BSG can significantly improve the fuel effïciency if the electric energy consumption is initially neglected. However, when considering the electric energy consumption within the vehicle co-simulation, efficient operation is particularly depending on driver torque demand, the battery state-of-charge and charging effïciency. Hence, intelligent operating strategies are necessary to take advantage of the better torque response and improve fuel consumption at the same time.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Electric torque assist and supercharging of a downsized gasoline engine in a 48V mild hybrid powertrain


    Contributors:


    Publication date :

    2021-04-01


    Size :

    11 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Integrated Powertrain Control for a Mild-Hybrid Urban Vehicle with a Downsized Turbo-Charged CNG Engine

    Tona, Paolino / Tilagone, Richard / Venturi, Stéphane | SAE Technical Papers | 2008


    Integrated powertrain control for a mild-hybrid urban vehicle with a downsized turbo-charged CNG engine

    Tona,P. / Venturi,S. / Tilagone,R. et al. | Automotive engineering | 2008


    NVH Aspects of a Downsized Turbocharged Gasoline Powertrain with Direct Injection

    Stoffels, Harald / Schroeer, Markus | SAE Technical Papers | 2003


    Integrated Powertrain Control for a Mild-Hybrid Urban Vehicle with a Downsized Turbo-Charged CNG Engine

    Tona, P. / Venturi, S. / Tilagone, R. et al. | British Library Conference Proceedings | 2008


    NVH aspects of a downsized turbocharged gasoline powertrain with direct injection

    Stoffels,H. / Schroeer,M. / Ford-Werke,Koeln,DE | Automotive engineering | 2003