The Boosting System - A Key Technology also for Electrified Combustion Engines?

Autoren

Dr.-Ing. Claus Glahn, Dipl.-Ing Achim Königstein, Dr.-Ing. Ingo Hermann, Opel Automobile GmbH, Rüsselsheim

Zusammenfassung

Future CO₂-legislation will drive propulsion systems from exclusively internal combustion engines (ICE) to electrified propulsion systems. For calendar year 2025 it is expected that still more than 60 % of the powertrains with ICEs will have a turbocharger.
But the role of the turbocharger will change with the degree of hybridization. Although the transient performance and low-end-torque of the ICE will lose importance, turbochargers will still play an important role regarding increased thermal efficiency, reduced package requirements and good driveability. With the reduced operation area as a result of the increasing electrification level, the complexity of the turbocharger can be reduced and can help to (partially) off-set the cost of electrification. The biggest potential for cost reduction offer full hybrids and serial hybrids, where the turbocharger can be optimized for a very small operation range - savings of up to 33 % seem feasible.

On the other hand, when performance is considered, the already available high voltage electrical infrastructure may reduce the cost for implementation of electrified turbochargers. Besides performance, also emissions related challenges can be effectively addressed when turbochargers are used as air pumps for secondary air injection (SAI) or electrically heated catalysts.

This paper shows the different scenarios for the boosting system that will remain a key enabling technology, also for electrified combustion engines.

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