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 compressor assembly can include a shaft sleeve that includes a bore that extends between a first end and a second end and an outer shoulder; a shaft received by the bore of the shaft sleeve where the shaft includes a compressor end; a compressor wheel disposed on the shaft; and a thrust collar disposed on the shaft and seated between the outer shoulder of the shaft sleeve and the compressor wheel where the thrust collar includes a stem portion and a cap portion that includes a sacrificial portion.

A compressor assembly can include a shaft sleeve that includes a bore that extends between a first end and a second end and an outer shoulder; a shaft received by the bore of the shaft sleeve where the shaft includes a compressor end; a compressor wheel disposed on the shaft; and a thrust collar disposed on the shaft and seated between the outer shoulder of the shaft sleeve and the compressor wheel where the thrust collar includes a stem portion and a cap portion that includes a sacrificial portion.

A centrifugal compressor includes a rotary blade that is rotatable around an axis. The centrifugal compressor includes an inlet part that extends in the axial direction, that forms an inlet passage to introduce gas to the rotary blade, and that includes a circular cross section. The centrifugal compressor includes a projecting part that projects from a part of a circumferential wall surface of the inlet passage. A top end of the projecting part is located within an inflow region through which gas flows to the rotary blade. An inclined surface of the projecting part is formed to be inclined so that the top end of the projecting part is located downstream in a rotation direction of the rotary blade relative to a base end of the projecting part.

A centrifugal compressor includes a rotary blade that is rotatable around an axis. The centrifugal compressor includes an inlet part that extends in the axial direction, that forms an inlet passage to introduce gas to the rotary blade, and that includes a circular cross section. The centrifugal compressor includes a projecting part that projects from a part of a circumferential wall surface of the inlet passage. A top end of the projecting part is located within an inflow region through which gas flows to the rotary blade. An inclined surface of the projecting part is formed to be inclined so that the top end of the projecting part is located downstream in a rotation direction of the rotary blade relative to a base end of the projecting part.

A control system for an internal combustion engine includes an electric supercharger that includes a compressor wheel that is configured to be rotated by an electric motor. The control system includes a bypass passage, a bypass valve, and an exhaust gas recirculation passage. The control device is configured to control the electric supercharger and the bypass valve based on an operation condition of the internal combustion engine. The control device is configured to cause a stepping operation of the electric supercharger in which acceleration and stopping of the compressor wheel are repeated within a predetermined cleaning time after operation of the internal combustion engine is stopped.

An exhaust-gas turbocharger (1) having a turbine (2) which has a turbine wheel (3) surrounded by an inflow duct (4), and having a VTG cartridge (5), which VTG cartridge has a disk (6) and a vane bearing ring (7), which delimit the inflow duct (4), and which VTG cartridge has a multiplicity of vanes (8) which are arranged in the inflow duct (4) and which are mounted in the vane bearing ring (7) by way of rotatable vane shafts (9), which vane shafts are connected to vane levers (10), the lever heads (11) of which engage into associated grooves (12) in an adjusting ring (13) which surrounds the vane bearing ring (7) on the outside. At least one min-flow stop (25, 26) has, on an outer surface (31), a laser-cut portion (32).

An exhaust-gas turbocharger (1) having a turbine (2) which has a turbine wheel (3) surrounded by an inflow duct (4), and having a VTG cartridge (5), which VTG cartridge has a disk (6) and a vane bearing ring (7), which delimit the inflow duct (4), and which VTG cartridge has a multiplicity of vanes (8) which are arranged in the inflow duct (4) and which are mounted in the vane bearing ring (7) by way of rotatable vane shafts (9), which vane shafts are connected to vane levers (10), the lever heads (11) of which engage into associated grooves (12) in an adjusting ring (13) which surrounds the vane bearing ring (7) on the outside. At least one min-flow stop (25, 26) has, on an outer surface (31), a laser-cut portion (32).

A method of controlling a supercharger includes: an information conversion step, a map deducing step, a boost amount deducing step, and a RPM deducing step. In the information conversion step, a sensor detects information of a vehicle, and a control unit converts the information into a factor and saves. The map deducing step includes deducing a total boost amount for driving an engine, and deducing a map for a target boost amount of a supercharger using a boost pressure of a turbocharger. A correction value deduced in the boost amount deducing step is calculated according to vehicle environment information, and a target RPM of the supercharger is calculated based on the target boost amount of the supercharger, and a boost pressure by the supercharger. In particular, the target boost amount of the supercharger is deduced based on the correction value, the converted factor, and the deduced map.

A method of controlling a supercharger includes: an information conversion step, a map deducing step, a boost amount deducing step, and a RPM deducing step. In the information conversion step, a sensor detects information of a vehicle, and a control unit converts the information into a factor and saves. The map deducing step includes deducing a total boost amount for driving an engine, and deducing a map for a target boost amount of a supercharger using a boost pressure of a turbocharger. A correction value deduced in the boost amount deducing step is calculated according to vehicle environment information, and a target RPM of the supercharger is calculated based on the target boost amount of the supercharger, and a boost pressure by the supercharger. In particular, the target boost amount of the supercharger is deduced based on the correction value, the converted factor, and the deduced map.