A control device for an internal combustion engine includes a throttle valve opening degree detector, an air bypass valve controller, and a torque reduction controller. The throttle valve opening degree detector detects an opening degree of a throttle valve which is provided downstream with respect to a compressor of a supercharger. The air bypass valve controller opens an air bypass valve based on a reduction change in the opening degree of the detected throttle valve. The air bypass valve is configured to open and close a bypass path. The torque reduction controller controls the throttle valve to reduce the opening degree of the throttle valve while an automatic transmission connected to the internal combustion engine is in an acceleration shifting in order to execute a torque reduction control. The air bypass valve controller maintains the air bypass valve in a close state during the torque reduction control.

An engine assembly is provided that includes an engine throttle and a supercharger placed in series with one another in air flow to the engine. The throttle and supercharger can be controlled so that throttling losses are selectively distributed across the throttle and/or the supercharger. Throttling losses placed across the supercharger can create torque that can be converted to stored energy.

A clutch-type air compressor system and a control method and control apparatus thereof. The clutch-type air compressor system includes a clutch-type air compressor, a natural aspiration pipeline connected to the atmosphere, a supercharged intake pipeline leading to an engine intake pipe, and an intake control valve disposed at a front end of an intake port of the clutch-type air compressor; the natural aspiration pipeline and the supercharged intake pipeline are connected to the intake port of the clutch-type air compressor via the intake control valve, and the intake control valve is allowed to switch on the natural aspiration pipeline or the supercharged intake pipeline alternatively.