Ultra-downsizing of internal combustion engines: simultaneous increasing of thermal converssion efficiency and power while reducing emissions

Abstract

Paper presented at the 8th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Mauritius, 11-13 July, 2011.The Downsizing of internal combustion engines (ICE) is al-ready 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 real Atkinson cycles, using asymmetrical crank mechanisms, combined with a very inten-sive 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.The Downsizing of internal combustion engines (ICE) is al-ready 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 real Atkinson cycles, using asymmetrical crank mechanisms, combined with a very inten-sive 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.