A method is disclosed for controlling exhaust gas flow from a combustion engine to a turbocharger. The combustion engine includes a plurality of cylinders each with first and second exhaust valves, and the turbocharger includes first and second volutes with outlets that are separated by approximately 180. The method includes: (i) directing exhaust flow from first and second cylinders into the first volute via a first exhaust channel by opening the first exhaust valve in the first and second cylinders; (ii) directing exhaust flow from third and fourth cylinders into the second volute via a second exhaust channel by opening the first exhaust valve in the third and fourth cylinders; and (iii) apportioning exhaust flow from each cylinder into the first and second volutes via the first and second exhaust channels by moving the second exhaust valve in each cylinder between a variety of positions.

A turbocharger includes a waste gate valve, a compressor, a turbine, a turbine housing which houses the turbine, a bypass channel which includes an opening cross-section, the bypass channel bypassing the turbine, a bypass channel portion formed in the turbine housing, an actuator housing which includes a separate first coolant channel having a coolant inlet port and a coolant outlet port, an electric motor arranged in the actuator housing, a transmission which includes an output shaft, the transmission being arranged in the actuator housing, and a control body coupled to the output shaft. The actuator housing is formed separately and is secured to the turbine housing. The control body controls the opening cross-section of the bypass channel.

A turbocharger includes a waste gate valve, a compressor, a turbine, a turbine housing which houses the turbine, a bypass channel which includes an opening cross-section, the bypass channel bypassing the turbine, a bypass channel portion formed in the turbine housing, an actuator housing which includes a separate first coolant channel having a coolant inlet port and a coolant outlet port, an electric motor arranged in the actuator housing, a transmission which includes an output shaft, the transmission being arranged in the actuator housing, and a control body coupled to the output shaft. The actuator housing is formed separately and is secured to the turbine housing. The control body controls the opening cross-section of the bypass channel.

An exhaust gas recirculation (EGR) system that utilizes an insulated separation wall that separates the hot, humid EGR gas duct from the cool, dry inlet air duct in the upstream proximity of the compressor inlet of the associated turbocharger compressor. This insulated separation wall inhibits the condensation of water droplets and the formation of ice particles near the mixing point of the EGR gases and inlet air in the upstream proximity of the compressor inlet, such that the turbocharger compressor wheel, blades, and other components are not subsequently damaged by the condensed water droplets or formed ice particles. The added insulation in this cold sink area essentially thermally isolates the hot, humid EGR gas flow from the cool, dry inlet air flow until the actual mixing point of the flows.

An exhaust gas recirculation (EGR) system that utilizes an insulated separation wall that separates the hot, humid EGR gas duct from the cool, dry inlet air duct in the upstream proximity of the compressor inlet of the associated turbocharger compressor. This insulated separation wall inhibits the condensation of water droplets and the formation of ice particles near the mixing point of the EGR gases and inlet air in the upstream proximity of the compressor inlet, such that the turbocharger compressor wheel, blades, and other components are not subsequently damaged by the condensed water droplets or formed ice particles. The added insulation in this cold sink area essentially thermally isolates the hot, humid EGR gas flow from the cool, dry inlet air flow until the actual mixing point of the flows.

A turbocharger includes a turbine housing that defines a flow passage for a fluid. The turbine housing includes a turbine shroud member. The turbocharger also includes a turbine wheel supported for rotation within the turbine housing relative to the turbine shroud member. The turbine wheel is configured to rotate as the fluid flows through the flow passage. Moreover, the turbocharger includes a port extending through the turbine shroud member. The port is configured to receive a portion of the fluid flowing through the flow passage.

A turbocharger includes a turbine housing that defines a flow passage for a fluid. The turbine housing includes a turbine shroud member. The turbocharger also includes a turbine wheel supported for rotation within the turbine housing relative to the turbine shroud member. The turbine wheel is configured to rotate as the fluid flows through the flow passage. Moreover, the turbocharger includes a port extending through the turbine shroud member. The port is configured to receive a portion of the fluid flowing through the flow passage.

A centrifugal compressor operable in a wide operation range under a condition accompanied with pulsations of a pressure and a flow rate. The centrifugal compressor has a casing including at least one recirculation channel that includes a first inlet slit connected to an air flow passage on a downstream side of a leading edge in an air flow direction of the air flow passage, a second inlet slit connected to the air flow passage on a downstream side of the first inlet slit in the air flow direction of the air flow passage, a first vane disposed on a downstream side of the first inlet slit or in the first inlet slit in the at least one recirculation channel, and a second vane disposed on a downstream side of the second inlet slit or in the second inlet slit in the at least one recirculation channel.

A centrifugal compressor operable in a wide operation range under a condition accompanied with pulsations of a pressure and a flow rate. The centrifugal compressor has a casing including at least one recirculation channel that includes a first inlet slit connected to an air flow passage on a downstream side of a leading edge in an air flow direction of the air flow passage, a second inlet slit connected to the air flow passage on a downstream side of the first inlet slit in the air flow direction of the air flow passage, a first vane disposed on a downstream side of the first inlet slit or in the first inlet slit in the at least one recirculation channel, and a second vane disposed on a downstream side of the second inlet slit or in the second inlet slit in the at least one recirculation channel.

A turbocharger includes a housing and a rotor with a shaft that is housed within the housing. The turbocharger also includes a bearing structure that supports rotation of the shaft within the housing and a locating fastener that retains the bearing structure in a position relative to the housing. Furthermore, the turbocharger includes a heating system coupled to the locating fastener and that is configured for selectively heating the locating fastener.