Two stroke engine with valves actuated by air pressure near bottom dead center

A two stroke engine comprising:

• a) A cylinder with at least one exhaust port near bottom dead center,
• b) a movable piston operating within the cylinder forming a combustion chamber and adapted to indirectly transmit the force from the combustion event towards a rotary shaft,
• c) a stationary piston operating within the movable piston forming a rear compression chamber other than that of the engine crank case,
• d) at least one valve, mounted near bottom dead center to close the at least one exhaust port, and adapted to trap the intake charge from the rear compression chamber into the combustion chamber,
• wherein the at least one valve is pushed open by the exhaust pressure leaving the combustion chamber, wherein the at least one valve is then pushed back, closing the at least one exhaust port, trapping the intake charge entering the combustion chamber from the rear compression chamber due to dropping pressure in the combustion chamber from exhaust escaping.