How Should Innovative Combustion Engines be Developed, Operated and Built in Order to Turn From Climate Sinners Into Climate Savers?

KEYWORDS – Strict Atkinson Cycle implementation, Extended Expansion Cycle, VCR, Enhanced Thermal Conversion Efficiency, High Pressure Turbocharging, Hydrogen DI, stoichiometric mixture, new load control ABSTRACT The Ultra-Downsizing is introduced as an even higher stage of downsizing of ICE. Ultra-downsizing will be implemented here by means of real Atkinson cycles using an asymmetrical crank mechanisms with continuous VCR capabilities, combined with two-stage high-pressure turbocharging and very 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. Research Objective The principal purpose of this investigation is to analyze and evaluate a strict implementations of Atkinson cycles on Internal Combustion Engines (ICE) by means of the VCSR asymmetrical crank mechanisms (VCSR means Variable Compression and Strokes Ratios) for DI-Hydrogen-fueled (or with H2-CNG blends) case. The VCSR will be presented in two constructive variants. The mechanical loads as torque and forces within the VCSR crank mechanism will be presented and analyzed in some engine operation points. Methodology A small size SI NA MPI engine is chosen in this study as reference for the comparison: A highly supercharging of this engine will be considered. The engine performance for an implementation of a VCR capability will be also evaluated. Results The simulation results are doing for cycle simulation by AVL-BOOST and for the kinetic and animation of the VCSR crank mechanism by MATLAB/SIMULINK/SIMSCAPE. Limitations of this study An important limitation of the current study is the missing at this time of the test bend results. What does the paper offer that is new in the field including in comparison to other work by the authors? The simulation of the kinetics of the VCSR crank mechanism is presented for the first time. By using such an asymmetrical crank mechanism with VCR, it is possible to achieve the Strict-Atkinson cycles of turbocharged engines for part- and full loads even with keeping of a stoichiometric AFR and without throttling or excessive EGR. The NOx emissions can be completely reduced by maintaining a stoichiometric AFR using a three-way catalyst.