Importance

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Abstract

An engine cycle control system controls an engine so that it operates in a two-cycle mode when the rotational speed of the engine is lower than a predetermined speed and in a four-cycle mode when the rotational speed of the engine is higher than the predetermined speed. The engine controlled by the engine cycle control system has intake ports defined in a lower circumferential surface of a cylinder, an exhaust port defined in an upper portion of the cylinder and openable and closable at variable timing, and a fuel injection valve for injecting fuel into the cylinder at variable timing and in a variable quantity. Depending on the rotational speed of the engine, the timing of operation of an exhaust valve is varied to select the two-cycle mode or the four-cycle mode. The engine is associated with a turbocharger combined with an electric motor. In a large-load range in the two-cycle mode, the electric motor is energized to assist in turbocharging operation for thereby increasing the torque produced by the engine.

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First Claim