Extreme downsizing for gasoline engines – fun to drive with extremely low emissions

Uhlmann, Tolga; Baumgarten, Henning; Franzke, Björn; Scharf, Johannes; Thewes, Matthias; Birmes, Georg

doi:10.1007/978-3-658-12918-7_8

Cited by 3 publications

(1 citation statement)

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“…Richards et al have shown that especially at high engine speeds and loads application of a larger TC can reduce the BSFC by up to 10%. 18 However, the limited capacity of the 48V battery would limit the usage of such a two-stage boosting system. To keep the engine performance unchanged from the base system even without electric boosting, a larger TC is not considered in this study.…”

Section: Steady State Investigation With 48v Systemmentioning

confidence: 99%

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

Xia

Griefnow

Tidau

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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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.

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Section: Steady State Investigation With 48v Systemmentioning

confidence: 99%