Abstract
The Downsizing of internal combustion engines (ICE) is already recognized as a very suitable method for the concurrent enhancement of the indicated fuel conversion efficiency (IFCE) and lowering of the CO2 and NOx emissions [1], [2].
In this report the Ultra-Downsizing is introduced as a still higher development stage of ICE. The Ultra-Downsizing will be implemented here by means of strict Atkinson cycles, using asymmetrical crank mechanisms, combined with a very intensive multistage high-pressure turbocharging with intensive intercooling. This will allow an increase of ICE performance while keeping the thermal and mechanical strain strength of engine components within the current usual limits.
Keywords: Atkinson Cycle, Ultra-Downsizing, High Pressure Turbocharging, CO2 and NOx Reduction.