A power system that includes an engine, a first exhaust manifold, a second exhaust manifold, and a turbine. The first and second exhaust manifolds are positioned downstream of the engine. The turbine is positioned downstream of the first exhaust manifold, but is not positioned downstream of the second exhaust manifold.

A valve for blocking and releasing a flow path, having an electromagnetic actuator unit, a pin axially movable by the electromagnetic actuator unit, a closure element connected to the pin. The closure element is designed to block and release a flow path and has a first axial end arranged remotely from the flow path and is connected to the pin, and a second axial end arranged in the flow path, and a housing which receives at least the pin and the first axial end of the closure element. At least in a region of its first axial end, the closure element has a radially circumferential seal with an outwardly protruding seal lip. The seal lip lies sealingly against a region of the housing in a closed state of the valve, and the seal lip has at least one radially circumferential bead.

A supercharging device is disclosed for an internal combustion engine having an exhaust-gas turbocharger and a fresh-air compressor. The supercharging device includes a recuperation charger which has a compressor-turbine with a high-pressure side and a low-pressure side and which has an electromechanical motor-generator coupled to the compressor-turbine. The compressor-turbine is operable at least firstly when the supercharging device is configured in a booster operating mode in a manner driven by the motor-generator as a compressor for increasing the pressure of charge-air mass flow to the intake tract of the engine, and secondly when the supercharging device is configured in a recuperation operating mode in a manner driven by the charge-air mass flow as a turbine for energy recovery by the motor-generator.

Disclosed herein is a technique for providing an engine supercharger allowing an exhaust gas to efficiently act on a turbine in a wide operating range. A turbine for use in a supercharger includes a turbine housing, a turbine scroll formed inside the housing continuously with a turbine lead-in route, and a turbine wheel to turn on an axis of rotation close to a tongue portion. The turbine lead-in route is partitioned by a partition wall into first and second lead-in routes. Exhaust variable valves are provided upstream of the second lead-in route in order to change the flow rate of the exhaust gas to be introduced. When viewed in the direction in which the axis of rotation extends, a downstream end of the partition is aligned with the axis of rotation and the tongue portion.

A turbocharger system is disclosed, including a turbine and compressor and a rotary valve unit. The rotary valve unit comprises a fixed valve seat and a rotary valve member arranged coaxially with the valve seat. The valve member is disposed against the valve seat and is rotatable about the axis for selectively varying a degree of alignment between respective orifices in the valve seat and valve member. The valve unit includes a valve housing that defines a first flow passage and a second flow passage, and the valve member and valve seat are disposed in the second flow passage. A turbocharger system is also disclosed, including a turbine and compressor and the rotary valve unit. The rotary valve unit is coupled with the turbine such that exhaust gas that has passed through the turbine wheel is fed into the first flow passage of the rotary valve unit, and exhaust gas that has bypassed the turbine wheel is fed into the second flow passage of the rotary valve unit.

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 waste gate valve actuator, that may be used for an exhaust gas turbocharger of a motor vehicle, may have a flap with a base surface to be supported on an edge of an inlet or outlet opening of a waste gate channel and a channel-side elevation, which at least in one cross section along its axial direction exhibits an outer contour with a first section and an adjoining section facing away from the base surface. The outer contour in the first section may have at least one outer tangent that includes a first angle deviating from zero with the axial direction, and in the second section may have at least two outer tangents spaced apart from each other in an axial direction that include the same second angle angle deviating from zero and the first angle with the axial direction, and/or wherein the elevation exhibits in particular a flat front surface facing away from the base surface, which in relation to the base surface-side floor surface of the elevation is offset toward a rotational axis of the flap.

Disclosed herein is a technique for providing an engine supercharger of a reduced size allowing an exhaust gas to be introduced smoothly into a turbine scroll. A turbine for use in this supercharger includes: a turbine lead-in route, into which the exhaust gas is introduced; a turbine scroll formed continuously with the turbine lead-in route to allow the exhaust gas to swirl around inside; a turbine wheel to turn on an axis of rotation; a turbine lead-out route; a wastegate passage to bypass the exhaust gas around the turbine scroll; and a wastegate valve. The turbine lead-in route includes a throat portion having a tapered downstream portion. The wastegate passage branches from that throat portion.

The invention concerns a discharge valve (17) intended to be fitted in a discharge duct of an apparatus designed to be driven by a fluid, in particular a turbocharger driven by the exhaust gases from an engine. The discharge valve (17) comprises a cavity (83) having a first (85), a second (87) and a third aperture (89), each intended to be connected to a respective duct, the discharge valve (17) also comprising first (91) and second (93) means for closing the first (85) and second (87) apertures, respectively, in order to control communication between the ducts.

A valve device includes: a mounting plate including a rotary shaft; an insertion hole formed in the mounting plate; a valve including a shaft portion inserted into the insertion hole; a larger-diameter portion of the shaft portion, at least a part of the larger-diameter portion being located within the insertion hole; a smaller-diameter portion of the shaft portion, a diameter of the smaller-diameter portion being smaller than that of the larger-diameter portion; a stepped surface formed between the larger-diameter portion and the smaller-diameter portion on the shaft portion; and a position regulating portion provided on the smaller-diameter portion, the position regulating portion being attached on the smaller-diameter portion at a position spaced apart from the stepped surface in a central axis direction of the shaft portion.