Abstract: Included may be a crankshaftless internal combustion engine, including a power shaft unit in which a transferring path of a power system may be selected depending on a deactivated state and an activated state of a cylinder, a cylinder separator separating a power system of the deactivated cylinder from the power shaft unit by control of an ECU operated by a deactivated cylinder and an activated cylinder, and a compression changing unit varying a compression ratio of the activated cylinder in multistage.

Abstract: Included may be a crankshaftless internal combustion engine, including a power shaft unit in which a transferring path of a power system may be selected depending on a deactivated state and an activated state of a cylinder, a cylinder separator separating a power system of the deactivated cylinder from the power shaft unit by control of an ECU operated by a deactivated cylinder and an activated cylinder, and a compression changing unit varying a compression ratio of the activated cylinder in multistage.

Abstract: A crankshaftless internal combustion engine includes a power shaft unit in which a transferring path of a power system is selected depending on a deactivated state and an activated state of a cylinder and a cylinder separator separating a power system of the deactivated cylinder from the power shaft unit by control of an ECU, thereby improving fuel efficiency due to a uniform change in volume of a combustion chamber of the cylinder and increasing reduction in Nox of exhaust gas, and particularly, a plurality of cylinders are controlled in a variable cylinder scheme to further improve fuel efficiency and be optimal to even EM improvement.