Hyundai-Kia’s Holistic Approach on 48V Hybridization

Authors

Dr.-Ing. M. Winkler, Dipl.-Ing. S. Hoffmann,
Dipl.-Ing. B. Unterberger, Dipl.-Ing. S. G. Park, Hyundai Motor Europe Technical Center GmbH, Rüsselsheim; Dipl.-Ing. M. Weissbäck, AVL List GmbH, Graz

Year

2015

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 783

Summary

To cope with upcoming emission legislations combined with the limitations of the real driving emissions cycle (RDE) and the demand to reduce the CO₂-fleet-value down to 95 g/km in 2021 it is essential to introduce electrified propulsion systems in addition to the conventional reduction measures. Plug-In and/or Full-Hybrid technology with voltage-levels up to 800V can help to solve this challenge but is currently quite expensive due to the high battery cost. An economical and effective entry into hybridization is the “Mild-Hybrid” approach with a voltage level of 48V. This technology is significantly easier to install into current vehicle platforms with a more affordable cost-benefit ratio. It offers great potential to improve fuel economy by applying hybrid features like load leveling and enhanced start/stop. Additionally, it is possible to add high power consumers like the electric supercharger which can greatly improve the vehicle dynamics with the opportunity for significant downspeeding of the engine. Overall, the implementation of a belt-driven 48V system in combination with an electric supercharger (abbr.: E-Charger) in a D-segment passenger car enables a CO₂ reduction of about 15 % with a simultaneous increase in engine power output of 25 %.