An engine system incorporating an intake manifold, a compressor, and a controller. The compressor may provide air to the intake manifold and the controller may be connected to the intake manifold and the compressor. The controller may receive a control signal and control air flow from the compressor to the intake manifold based on the received control signal. The controller may control the air flow from the compressor to the intake manifold based on a first equation when a value related to the control signal is on a first side of a threshold and according to a second equation when the value is on a second side of the threshold. The controller may control the air flow between the compressor and intake manifold according to the second equation to prevent the compressor from operating at a surge condition when controlling the air flow according to the first equation.

An engine system incorporating an intake manifold, a compressor, and a controller. The compressor may provide air to the intake manifold and the controller may be connected to the intake manifold and the compressor. The controller may receive a control signal and control air flow from the compressor to the intake manifold based on the received control signal. The controller may control the air flow from the compressor to the intake manifold based on a first equation when a value related to the control signal is on a first side of a threshold and according to a second equation when the value is on a second side of the threshold. The controller may control the air flow between the compressor and intake manifold according to the second equation to prevent the compressor from operating at a surge condition when controlling the air flow according to the first equation.

A generator system may include a compressor and an electric motor. The compressor includes an impeller, and the compressor provides a quantity of air flowing toward an intake of an engine through rotation of the impeller. The electric motor is mechanically linked to the compressor and rotates the impeller to force the quantity of air flowing toward the intake of the engine. The generator system may include a charge air cooler to receive the quantity of air flowing toward the intake of the engine and increase an air charge density of the quantity of air. The generator system may include an exhaust portion to expel exhaust from the engine such that the quantity of air provided by the compressor does not include exhaust expelled by the exhaust portion. The generator system may include an air valve configured to regulate the quantity of air flowing toward the intake of the engine.

A generator system may include a compressor and an electric motor. The compressor includes an impeller, and the compressor provides a quantity of air flowing toward an intake of an engine through rotation of the impeller. The electric motor is mechanically linked to the compressor and rotates the impeller to force the quantity of air flowing toward the intake of the engine. The generator system may include a charge air cooler to receive the quantity of air flowing toward the intake of the engine and increase an air charge density of the quantity of air. The generator system may include an exhaust portion to expel exhaust from the engine such that the quantity of air provided by the compressor does not include exhaust expelled by the exhaust portion. The generator system may include an air valve configured to regulate the quantity of air flowing toward the intake of the engine.

A planetary gear device for a motorcycle transmits a power of a reciprocating combustion engine to a supercharger. The supercharger pressurizes intake air for the combustion engine. The supercharger includes a supercharger rotation shaft and an impeller supported by the supercharger rotation shaft. A planetary gear and an internal gear of the planetary gear device are each composed of a helical gear, and the planetary gear and the internal gear form a helical gear pair. The planetary gear device includes a pressing unit that applies a pressing force in an axial direction to the planetary gear.

A planetary gear device for a motorcycle transmits a power of a reciprocating combustion engine to a supercharger. The supercharger pressurizes intake air for the combustion engine. The supercharger includes a supercharger rotation shaft and an impeller supported by the supercharger rotation shaft. A planetary gear and an internal gear of the planetary gear device are each composed of a helical gear, and the planetary gear and the internal gear form a helical gear pair. The planetary gear device includes a pressing unit that applies a pressing force in an axial direction to the planetary gear.

Methods and systems are provided for de-icing a charge-air cooler of a boosted engine system when the engine is turned off. In one example, a method may include recirculating air through a bypass passage including an activated electric supercharger and the CAC. The air is warmed by compression and thaws ice accumulated in the CAC.

Methods and systems are provided for de-icing a charge-air cooler of a boosted engine system when the engine is turned off. In one example, a method may include recirculating air through a bypass passage including an activated electric supercharger and the CAC. The air is warmed by compression and thaws ice accumulated in the CAC.

A turbocharger assembly can include a shaft sleeve that includes a bore that extends between a compressor end and a turbine end, outer threads that extend to a first axial position from the compressor end, and an outer shoulder at a second, greater axial position from the compressor end; a lock nut that includes inner threads that mate with the outer threads of the shaft sleeve and an axial length that is less than a distance between the compressor end and the first axial position; and a bearing assembly that includes at least one inner race axially located by the outer shoulder of the shaft sleeve and axially located by the lock nut.

A turbocharger assembly can include a shaft sleeve that includes a bore that extends between a compressor end and a turbine end, outer threads that extend to a first axial position from the compressor end, and an outer shoulder at a second, greater axial position from the compressor end; a lock nut that includes inner threads that mate with the outer threads of the shaft sleeve and an axial length that is less than a distance between the compressor end and the first axial position; and a bearing assembly that includes at least one inner race axially located by the outer shoulder of the shaft sleeve and axially located by the lock nut.