Effective Engine Downsizing Through the Use of Compression Ignition Poppet-Valved 2-Stroke Engine With Novel Combustion Cycle Involving Oxygen and Water 2009-32-0047

A novel combustion cycle involving oxygen and water is proposed as a potential replacement to the existing Otto and Diesel cycles. The cycle involves a compression ignition 2-stroke engine equipped with poppet exhaust valves and 2 high pressure gas injectors. Novel exhaust valve timing and lift strategy is applied to control the cylinder temperature for optimal fuel auto-ignition. High purity oxygen is used to replace air. Water having high specific heat capacity and gas constant is used as a working medium. In theory, relatively higher engine output from a comparable size of engine displacement can be expected as lesser heat is rejected to the environment.