An Analysis of Variable Compression Ratio Engine

Abstract

The variable compression ratio engine presents several advantages to efficiency and power density. At low power output, the engine can be made to operate as a high compression ratio naturally aspirated engine. When high power output is demanded, the engine can be made to operate as a low compression ratio heavily boosted engine. The tremendous power density potential also presents the engine designer with a large opportunity for displacement downsizing while still meeting power requirements for the application.