A method of raising exhaust gas temperatures of a two-cycle uniflow scavenged engine at lower loads. At lower loads, the exhaust valves are activated with a frequency that is less frequent than every engine cycle. This retains exhaust within the cylinder for one or more cycles, and when the exhaust valves are again activated, the exhaust temperature will be elevated. For engines having a means for controlling intake manifold pressure, such as a compressor having variable speed or a means for bleeding off compressor output, intake manifold pressure can be reduced at low loads, which also has the effect of elevating exhaust temperatures.

Methods and systems are provided for increasing vehicle maneuverability when operating on sand, snow, or rocky terrain, as well as while performing cornering and sliding maneuvers. Boost path actuators are held in positions that enable manifold pressure to be held above barometric pressure as torque demand changes, including when torque demand drops. Engine torque is reduced or raised via adjustments to one or more of fuel delivery, spark timing, and intake throttle opening.

To provide a controller and a control method for a supercharger-equipped internal combustion engine capable of assisting the insufficient part of supercharging pressure supercharged by the turbocharger, with a good responsiveness by the electric compressor, using simple calculation, even though using a plurality of superchargers. The controller for a supercharger-equipped internal combustion engine calculates, as a target intermediate supercharging pressure, a value subtracting, from the target supercharging pressure, a pressure difference subtracting the actual intermediate supercharging pressure from the actual supercharging pressure; calculates a pressure ratio of the target intermediate supercharging pressure and the actual atmospheric pressure; calculates a target rotational speed of the electric compressor based on the pressure ratio and the actual intake air flow rate; and controls the electric motor.

The disclosure concerns a method and a control arrangement for controlling valve actuation of an ICE comprising an exhaust valve, an intake valve, and a turbo compressor. The method comprises and the control arrangement is configured to: limiting/limit valve actuation changes of the exhaust and intake valves based on compressor data including surge limit data for the turbo compressor and one or both of a current turbo compressor rotational speed and a current turbo compressor pressure ratio, to maintain a turbo compressor mass flow above a limit mass flow value.

A multi-stage turbo supercharging system includes: a bypass passage which bypasses a turbocharger from among a plurality of turbochargers, in an intake passage or an exhaust passage of the engine; a bypass valve disposed in the bypass passage; an operation mode selection part; a bypass valve opening degree map selection part configured to select at least one bypass valve opening degree map in accordance with the operation mode selected by the operation mode selection part, from among a plurality of bypass valve opening degree maps which represent respective relationships between a plurality of control parameters of the engine and an opening degree of the bypass valve; a bypass valve opening degree determination part configured to determine an opening degree command value for the bypass valve on the basis of the bypass valve opening degree map and control parameter information representing the plurality of control parameters; and a bypass valve opening degree control part configured to control the opening degree of the bypass valve on the basis of the opening degree command value for the bypass valve.

A dual volute turbocharger for use with an internal combustion engine includes a valve for controlling exhaust gas flow to a turbine housing interior of the dual volute turbocharger. The dual volute turbocharger also includes a first volute and a second volute each adapted for fluid communication with the internal combustion engine. The dual volute turbocharger further includes a wall separating the first and second volutes and a valve seat. The valve seat and the wall collectively define a valve cavity. The valve is movable between a closed position and an open position. The valve and the wall of the turbine housing collectively define a first cross-sectional flow area. The valve and the valve seat collectively define a second cross-sectional flow area. A method of controlling the valve of the dual volute turbocharger is also disclosed.

A valve assembly for controlling exhaust gas flow to a turbine housing interior of a dual volute turbocharger includes a first valve member, a valve shaft, and a second valve member. The first valve member is disposed about and extends along an axis between a first end and a second end and is movable between a first, a second, and a third position for controlling exhaust gas flow to the turbine housing interior. The first valve member defines a valve interior between the first and second ends. The valve shaft is partially disposed in the valve interior and is coupled to the first end of the first valve member. The second valve member has a base coupled to and disposed about the valve shaft and a projection extending from the base and about the shaft into the valve interior. The second valve member is movable between closed and open positions.

A system includes a dual volute turbocharger and a controller. The dual volute turbocharger includes a turbine housing. The turbine housing includes a wall, a valve seat, and an interior surface defining a turbine housing interior, a first volute, a second volute, and a turbine housing outlet. The dual volute turbocharger also includes at least one valve member engageable with at least one of the valve seat and the wall of the turbine housing. The at least one valve member and the wall of the turbine housing collectively define a first cross-sectional flow area. The at least one valve member and the valve seat of the turbine housing collectively define a second cross-sectional flow area. The controller is adapted to control the at least one valve member to have an area ratio constant operating range according to a brake-specific fuel consumption of the internal combustion engine.

An exhaust manifold for use with an internal combustion engine, the exhaust manifold including a body, one or more fluid passageways defined by the body, a valve in fluid communication with at least one of the one or more fluid passageways, the valve being adjustable between an open configuration and a closed configuration, a mounting bracket supported by the body, and an actuator in operable communication with the valve and configured to adjust the valve between the open and closed configurations, and wherein the actuator is coupled to the mounting bracket.

A turbocharger system includes a valve member with at least one valve passage. The valve member is supported for rotation about an axis of rotation between a first position, a second position, and a third position. The axis of rotation is oriented transverse to flow within a first volute passage and a second volute passage. The valve passage, with the valve member in the first position, provides a cross flow path between the first volute passage and the second volute passage and provides a bypass flow path from at least one of the first and second volute passages and a bypass passage. In the second position, the valve passage provides the cross flow path, and the valve member substantially prevents flow along the bypass flow path. The valve member, in the third position, substantially prevents flow along the cross flow path and the bypass flow path.