A product may be provided for use with a turbocharging system. A housing may be configured to house a bearing. A shaft may extend through the bearing. A turbine wheel may be connected to one end of the shaft. The housing may include a wall forming an opening and defining a surface facing the opening. The bearing may have a segment extending into the opening and mating with the surface. The wall may include an oil spray groove opening through the surface and having an outlet directed at the shaft.

A compressor for a turbocharger for use with an internal combustion engine includes a compressor wheel having a central hub having a centerline, a root portion, and an end portion. A plurality of blades is formed around the central hub. The plurality of blades includes a group of full-blades extending from the root portion of the central hub up to a maximum distance from the root portion along the centerline, the maximum distance being adjacent the end portion of the central hub. The plurality of blades includes a group of half-blades, the half-blades extending from the root portion of the hub to an area along the centerline that is between 60% and 65% of the maximum distance along the centerline. The plurality of blades is organized in repeating sets of blades arranged around the compressor wheel, each repeating set including at least one full-blade and at least one half-blade.

A compressor for a turbocharger for use with an internal combustion engine includes a compressor wheel having a central hub having a centerline, a root portion, and an end portion. A plurality of blades is formed around the central hub. The plurality of blades includes a group of full-blades extending from the root portion of the central hub up to a maximum distance from the root portion along the centerline, the maximum distance being adjacent the end portion of the central hub. The plurality of blades includes a group of half-blades, the half-blades extending from the root portion of the hub to an area along the centerline that is between 60% and 65% of the maximum distance along the centerline. The plurality of blades is organized in repeating sets of blades arranged around the compressor wheel, each repeating set including at least one full-blade and at least one half-blade.

Methods and systems are provided for a turbocharger comprising a compressor inlet shaped to mitigated condensate formation therein. In one example, system may include a condensate trap which runs along an inner wall of the compressor inlet and is shaped to trap condensate.

A variable flow-restricting turbine assembly for a turbocharger includes a housing, a turbine mounted for rotation in the housing, and a variable flow-restrictor. The variable flow-restrictor includes a first series of angularly-distributed flow-restrictor portions distributed around the turbine wheel and located in an exhaust flow path to the wheel, and a second series of angularly-distributed flow-restrictor portions distributed around the first series and located in the exhaust path. At least one of the first and second series is rotatable in the housing to vary the relative angular positions of the first and second series. The restrictor portions are arranged such that the first portions align with the second portions at each of a plurality of relative angular positions to open flow channels between the portions and such that they misalign between those positions to close the flow channels.

A variable flow-restricting turbine assembly for a turbocharger includes a housing, a turbine mounted for rotation in the housing, and a variable flow-restrictor. The variable flow-restrictor includes a first series of angularly-distributed flow-restrictor portions distributed around the turbine wheel and located in an exhaust flow path to the wheel, and a second series of angularly-distributed flow-restrictor portions distributed around the first series and located in the exhaust path. At least one of the first and second series is rotatable in the housing to vary the relative angular positions of the first and second series. The restrictor portions are arranged such that the first portions align with the second portions at each of a plurality of relative angular positions to open flow channels between the portions and such that they misalign between those positions to close the flow channels.

A control device for an internal combustion engine includes an electronic control unit configured to switch a control algorithms for a calculation of a command value of the actuator between a first control algorithm and a second control algorithm. The electronic control unit is configured to calculate a value obtained by adding a value of a term of the second control algorithm changing in accordance with the deviation calculated in a present control cycle to the command value calculated in a previous control cycle in accordance with the first control algorithm as a value of the command value calculated in the present control cycle in a first control cycle after switching from the first control algorithm to the second control algorithm. The value of the term changing in accordance with the deviation includes an update amount of an I term of the I control calculated in the present control cycle.

A control device for an internal combustion engine includes an electronic control unit configured to switch a control algorithms for a calculation of a command value of the actuator between a first control algorithm and a second control algorithm. The electronic control unit is configured to calculate a value obtained by adding a value of a term of the second control algorithm changing in accordance with the deviation calculated in a present control cycle to the command value calculated in a previous control cycle in accordance with the first control algorithm as a value of the command value calculated in the present control cycle in a first control cycle after switching from the first control algorithm to the second control algorithm. The value of the term changing in accordance with the deviation includes an update amount of an I term of the I control calculated in the present control cycle.

Methods and systems are provided for a boosted internal combustion engine. In one example, a system may include an intake system for supplying charge air, a compressor arranged in the intake system, a first shut-off element arranged in the intake system upstream of an impeller of the compressor, a bypass line that branches off from the intake system upstream of the first shut-off element and that rejoins the intake system upstream of the impeller, a second shut-off element arranged in the bypass line, a compressed air line that opens into the bypass line downstream of the second shut-off element, and a third shut-off element arranged in the compressed air line. A map width of the compressor may be increased by providing airflow to the impeller via the bypass line during low mass flow conditions, and impeller acceleration may be expedited by providing compressed air via the compressed air line.

Provided is a discharge section structure for a centrifugal compressor provided with a scroll flow passage and a discharge flow passage connected to the scroll flow passage. The discharge section structure includes a tongue section provided in a branching section between the scroll flow passage and the discharge flow passage; a first flow passage section having a center of curvature on an origin side of the scroll flow passage; and a second flow passage section communicating with the first flow passage section and having a center of curvature on an outer side of the scroll flow passage. The first flow passage section includes at least a part of the scroll flow passage, and the second flow passage section includes at least a part of the discharge flow passage. The tongue section faces the second flow passage section and is located in the middle of the second flow passage section.