INTERNAL COMBUSTION ENGINE AND METHOD OF ITS OPERATION Russian patent published in 1994 - IPC

FIELD: mechanical engineering. SUBSTANCE: internal combustion engine has at least one cylinder with two opposed pistons, rows of intake and exhaust ports, bypass passage divided by free additional piston into inlet brought in communication with exhaust ports and exhaust valves and inlet connected by means of bypass valves with under-piston chambers whose minimum pressure is regulated with the aid of external source of compressed gas. The method may be applied to diesel engines and carburettor engines. EFFECT: recovery of energy of exhaust gas pressure, enhanced efficiency, simplified construction and enhanced reliability. 11 cl, 4 dwg