Opportunities for Electrified IC Engines 2020-01-0281
The automotive industry is polarized between external pressures for ‘zero’ emission battery electric vehicles (BEV) and the ability to manufacture them economically and with minimal environmental impact. Most predictions of future BEV market share suggest that the IC engine has an important role to play in personal transportation for the next several decades. That engine will very likely be part of a hybrid architecture. Accepting that the engine will be part of a hybrid powertrain permits new design rules and strategies for the IC engine. A major characteristic change of the engine will be to reduce BMEP, power density and engine speed requirements as performance demand will be supplemented by electric machines. This paper focuses on some simple changes to the IC engine to increase thermal efficiency with the knowledge of the supplemental electric energy. The boosting systems on ICE engines today are sized appropriately for a wide speed range, with the result being a device which is compromised across the operating range. By reducing the engine load requirement, the device can be optimized for its smaller operating window. Additionally, the engine’s compression ratio can be further optimized if the IC engine power requirement is reduced. A GT-Power study quantifies the potential benefit of turbo sizing and compression ratio increase for two engine displacements.
Graham Conway, Paul Chambon, Terrence Alger