MILLER CYCLE ENGINE

摘要

Disclosed is a Miller cycle engine wherein the heat efficiency is improved by increasing the supply air pressure and the reliability of the mechanical strength and thermal load of the engine body is maintained by maintaining the in-cylinder maximum pressure. Specifically disclosed is a Miller cycle engine characterized by being provided with a supply air valve varying means (36) which controls the valve opening/closing time of the supply air valve (14), a stream turbine (28) which serves as a supply air pressure adding device for additionally increasing only the supply air pressure with respect to supercharging by a supercharger (20) or increasing the supply air pressure more than the exhaust air pressure, and a valve closing time control means (34) which advances the valve closing time of the supply air valve (14) further as the supply air pressure added by the steam turbine (28) is higher to thereby maintain approximately the same in-cylinder maximum pressure as the in-cylinder maximum pressure before the addition.