Advanced Powertrain Functions and Predictive Operating Strategies for 48 V Mild Hybrid Vehicles

Autoren

Philip Griefnow, MSc., Prof. Dr.-Ing. Jakob Andert, Michael Engels, MSc., Institut für Verbrennungskraftmaschinen (VKA), RWTH Aachen University, Aachen;
Dr.-Ing. Thomas Hülshorst, Dipl.-Ing. Jürgen Ogrzewalla, Hans Ligtelijn, MSc., Dipl.-Ing. Dejan Jolovic, Dr.-Ing. Rene Savelsberg, FEV Europe GmbH, Aachen;
Dr.-Ing. Rainer Peck, Florian Rief, MSc., SEG Automotive Germany GmbH, Stuttgart

Zusammenfassung

Powertrain electrification is considered one of the key technologies to address the upcoming challenges of stricter legislative requirements for pollutant and CO₂ emissions. In order to ensure an ecological and economic transition towards electric
mobility, realization of technical concepts with a high short term market penetration are very important. Thereto, especially 48 V mild hybrid systems with an attractive cost to CO₂ reduction ratio as well as advanced powertrain functions with considerable customer value can deliver an important contribution.

Within this study, a progressive 48 V electrification of a high performance vehicle (Mercedes-Benz AMG A45) is analyzed to demonstrate the opportunities and the potential of a mild powertrain hybridization with a belt-driven starter generator (BSG)
in a P0 position. The concept is realized in a prototype vehicle setup and verified on test tracks and public roads. Functions like energy recuperation and engine off coasting show an essential CO₂ reduction potential under real world driving conditions,
while electric supercharging (E-Charging) and torque assist by the BSG (E-boosting) significantly improve the response characteristics and thus the driving pleasure.

The study emphasizes the advantages of predictive driving control approaches for an efficient and comfortable implementation of engine off coasting strategies. Further on, it analyzes the engine start capabilities of the 48 V Boost Recuperation Machine® (BRM equivalent to BSG) and points out opportunities for optimized engine start calibrations. Finally, the study demonstrates the importance of intelligent electrical energy management and innovative development approaches for 48 V systems to exploit the full potential at reasonable system dimensioning and cost.

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