A turbine includes: a housing including an accommodating portion accommodating a turbine impeller; a first turbine scroll flow path communicating with the accommodating portion; a second turbine scroll flow path communicating with the accommodating portion and having a volume larger than a volume of the first turbine scroll flow path; a valve seat having a first port and a second port, the first port communicating with the first turbine scroll flow path, the second port communicating with the second turbine scroll flow path and having an opening area smaller than an opening area of the first port; a valve configured to contact the valve seat; and a shaft holding the valve and arranged on a side opposite to the first port with respect to the second port.

A turbocharger includes a turbine housing having a hub-side scroll flow path and a shroud-side scroll flow path, and a turbine wheel having front edges for receiving a working fluid from the hub-side scroll flow path and the shroud-side scroll flow path. Each front edge of the turbine wheel includes a first portion for receiving the working fluid flowing out from the hub-side scroll flow path, and a second portion for receiving the working fluid flowing out from the shroud-side scroll flow path. The first portion is inclined with respect to a virtual plane including a rotational axis in a direction opposite a rotational direction of the turbine wheel. The second portion is inclined with respect to the virtual plane in the rotational direction.

A forced-induction device includes a turbine wheel and a partition wall that partitions the interior of a connection pipe into a first passage and a second passage. When viewed in a cross section orthogonal to a rotation axis of the turbine wheel, a line segment connecting the rotation center of the turbine wheel and a downstream end of an inner wall in a flow direction of exhaust gas is a first line segment. A straight line orthogonal to the first line segment and extending from the downstream end in the flow direction of the exhaust gas is a first imaginary line. A straight line passing through a proximal end of the partition wall and orthogonal to an inflow direction of the exhaust gas is a second imaginary line. The distal end of the partition wall is located between the first imaginary line and the second imaginary line.

A turbine assembly can include a turbine housing that defines a longitudinal axis and that includes a first scroll and a first tongue at a first angle about the longitudinal axis and a second scroll and a second tongue at a second angle about the longitudinal axis, where an angular span between the first angle and the second angle is greater than 1 degree and less than 180 degrees; and a first set of vanes and a second set of vanes disposed in the turbine housing, where a vane of the first set of vanes is aligned with the first tongue and a vane of the second set of vanes is aligned with the second tongue.

A forced-induction device includes a turbine wheel and a partition wall that partitions the interior of a connection pipe into a first passage and a second passage. When viewed in a cross section orthogonal to a rotation axis of the turbine wheel, a line segment connecting the rotation center of the turbine wheel and a downstream end of an inner wall in a flow direction of exhaust gas is a first line segment. A straight line orthogonal to the first line segment and extending from the downstream end in the flow direction of the exhaust gas is a first imaginary line. A straight line passing through a proximal end of the partition wall and orthogonal to an inflow direction of the exhaust gas is a second imaginary line. The distal end of the partition wall is located between the first imaginary line and the second imaginary line.

A forced-induction device includes a turbine wheel, a turbine housing, and a connection pipe. The connection pipe includes a partition wall that partitions the inside of the connection pipe into a first passage and a second passage. When a cross section orthogonal to a rotation axis of the turbine wheel is viewed, a line segment extending from the distal end of the partition wall toward the upstream side in the flow direction of exhaust gas and defining a boundary between the first passage and the partition wall is a first downstream line segment. A line segment extending from the distal end of the partition wall toward the upstream side in the flow direction of exhaust gas and defining a boundary between the second passage and the partition wall is a second downstream line segment. The first downstream line segment and the second downstream line segment are parallel to each other.

The invention relates to a method to control an internal combustion engine. The internal combustion engine comprises a cylinder, an exhaust guide arranged to guide an exhaust flow from the cylinder through a turbine, and a bypass guide arranged to bypass a bypass flow from the cylinder past the turbine. The method comprises the step to determine a value of at least one engine operation parameter. The method is characterized by the step to determine a target value of an exhaust performance parameter depending on the determined engine operation parameter value. Further, the method comprises, depending on the determined target exhaust performance parameter value, the step to control the exhaust flow through the exhaust guide and the step to control the bypass flow through the bypass guide.

A rotary turbine bypass valve comprises a valve chamber and a valve rotor. The chamber is positioned at a junction of an inlet port, an outlet port and a bypass port. The inlet port is configured to receive exhaust gas, the outlet port is configured to fluidly communicate with a turbine inlet, and the bypass port is configured to fluidly communicate with an exhaust aftertreatment device. The rotor comprises a first and second recess, the first recess defining a primary flow passage, the second recess defining a secondary flow passage. The rotor is rotatable between a first position in which the rotor substantially blocks exhaust gas flow through the bypass port and a second position in which the rotor permits such. The secondary flow passage is configured to selectively permit fluid communication between the inlet port and the bypass port when the primary flow passage is partially blocked.

An applied-ignition internal combustion engine includes first and second combustion chambers, an exhaust-gas system with an exhaust-gas purification system is disposed at the first and second combustion chambers, and an exhaust-gas manifold. An exhaust gas from a combustion of a an air/fuel mixture firstly flows through the exhaust-gas manifold and subsequently flows through the exhaust-gas purification system. A first section of the exhaust-gas system from the first combustion chamber to the exhaust-gas purification system is cooled more than a second section of the exhaust-gas system from the second combustion chamber to the exhaust-gas purification system. The first combustion chamber is operated with a lean air/fuel mixture, the second combustion chamber is operated with a rich air/fuel mixture, and an overall exhaust-gas lambda value at an inlet into the exhaust-gas purification system is stoichiometric.

A forced-induction device includes a turbine wheel, a turbine housing, and a connection pipe. The connection pipe includes a partition wall that partitions the inside of the connection pipe into a first passage and a second passage. When a cross section orthogonal to a rotation axis of the turbine wheel is viewed, a line segment extending from the distal end of the partition wall toward the upstream side in the flow direction of exhaust gas and defining a boundary between the first passage and the partition wall is a first downstream line segment. A line segment extending from the distal end of the partition wall toward the upstream side in the flow direction of exhaust gas and defining a boundary between the second passage and the partition wall is a second downstream line segment. The first downstream line segment and the second downstream line segment are parallel to each other.