Abstract
During the long history of the IC - engine, high power density has been frequently used by racing engines to achieve high power output, often related to regulations prescribing maximum allowed engine displacement. The high power density can be obtained through charging, if that is permitted, otherwise raising the engine speed is necessary.
Here a concept will be presented that uses high power and torque density to reduce fuel consumption and thereby CO2 - emissions, by replacing a 3.0L NA engine with a 1.6L Supercharged engine while still maintaining equivalent vehicle performance.
In addition to the small engines low friction and weight, it also operates at a high specific load, resulting in high efficiency.
To reach high specific power and torque, a combination of Variable Compression Ratio ( VCR ) and High Pressure Charging is used. Downsizing then transforms the high specific performance to good fuel consumption, but with performance equal to a larger engine.
From the downsizing and the higher CR at part load, a decrease of 25 - 30% in fuel consumption over the drive cycle was expected.