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 engine including an exhaust bypass valve and an intake bypass valve. The exhaust bypass valve is disposed in an exhaust bypass channel connecting an outlet of an exhaust manifold and an exhaust outlet of a turbocharger to each other. The intake bypass valve is disposed in an intake bypass channel connecting an inlet of an intake manifold and an inlet of the turbocharger. An intake pressure sensor detects a pressure of the intake manifold. If an instruction value indicating an upper limit or a lower limit of the valve opening degree of the intake bypass valve is continuously output for a predetermined time or more, an engine control device determines that an abnormality occurs in at least one of the exhaust bypass valve and the intake bypass valve.

Control of a quantity of air introduced into an intake of a supercharged internal combustion engine which includes a proportional valve located in a partial transfer duct which controls flow of compressed air flow through the partial transfer duct into an inlet of a turbine. The proportional valve is controlled to move between open and closed positions in accordance with strategies in accordance with stabilized phases of operation of the engine. Characteristics of stabilized phases of operation of the engine are determined and are used to control circulation of the compressed air during transitions between the stabilized phases of engine operation in accordance with the determined characteristics of the stabilized phases of the engine operation. The determined characteristics are derived from a previously completed mapping of speed and charging of the supercharged engine during a previous stabilized phase.

An exhaust turbocharger includes an exhaust control device provided with an exhaust flap for adjusting an exhaust gas flow flowing through a turbine stage of the exhaust turbocharger during the operation thereof, a control gear coupled to the exhaust flap, and a servomotor via which the exhaust flap can be moved in a regulated and/or controlled manner by operation of the control gear at least between a closing position, in which the exhaust flap closes an exhaust gas opening in a turbocharger housing of the turbocharger, through which exhaust gas flows during the operation of the exhaust turbocharger, and at least one other position in which the exhaust flap allows exhaust gas to flow through the exhaust gas opening. The control gear is a self-locking gear via which the exhaust flap can be prestressed in the closing position thereof in relation to the turbocharger housing.

A two-stroke opposed piston internal combustion engine including a plurality of cylinders, each cylinder being provided with a first piston and a second piston adapted to perform opposed motions in the cylinder, each cylinder being provided with at least one intake port, a communication between an air intake arrangement and the cylinder via the intake port being dependent on the position of the first piston, each cylinder further being provided with at least one exhaust port, a communication between an exhaust guiding arrangement and the cylinder via the exhaust port being dependent on the position of the second piston, at least one of the cylinders being provided with an additional port and an additional port valve, a communication between the cylinder and an additional conduit externally of the cylinder, via the additional port, being controllable with the additional port valve, the air intake arrangement including at least one intake valve for selectively reducing or inhibiting air admittance to at least one of the cylinders.

A system and method of operating the same includes an engine speed sensor determining an engine speed, an exhaust gas bypass valve, an exhaust gas bypass valve actuator coupled to the exhaust gas bypass valve and a controller. The controller partially opens the exhaust gas bypass valve with a first predetermined effective area greater than fully closed when the engine speed is at idle. The controller determines an acceleration event, holding the exhaust gas bypass valve open at least a second predetermined effective area greater than fully closed in response to the acceleration event.

A method for controlling a supercharging system for an internal combustion engine, the supercharging stage including a compressor and a turbine, and the turbine being settable with the aid of a VTG driving circuit. The method including: detecting an operating state setpoint variable, setting a maximum VTG control criterion for implementing the torque increase by an increase in a boost pressure. The setting of the maximum VTG control criterion comprising: ascertaining a setpoint boost pressure; ascertaining a VTG setpoint position as a function of the setpoint boost pressure; ascertaining an actual exhaust gas back pressure; ascertaining an actual exhaust gas pressure downstream from the turbine; ascertaining a maximum exhaust gas back pressure, taking into account the actual exhaust gas pressure downstream from the turbine; determining the VTG control criterion, based on the difference between the actual exhaust gas back pressure and the maximum exhaust gas back pressure.

In an engine system 10 having a high-pressure stage turbocharger 11 and a low-pressure stage turbocharger 12 provided in series, a control device 40 is configured to perform control such that when switching from multi-stage supercharging Cm to single-stage supercharging Cs, after only the exhaust bypass valve 23 is opened, and thereafter, an intake bypass valve 21 is opened later than at a timing at which the exhaust bypass valve 23 is opened.

An internal combustion engine, as a drive engine for a vehicle, including an engine braking device having a throttle element which is associated with an exhaust gas section, for damming an exhaust gas which is emitted by a combustion device, and including a measuring device by means of which the exhaust gas pressure can be measured at a defined measuring region of the exhaust gas section upstream of the throttle element as seen in the exhaust gas flow direction. According to the disclosure, it is provided that at least one further measuring device is provided, by means of which the exhaust gas pressure can be measured at the defined measuring region, for realizing a redundant exhaust gas pressure measurement, and the measurement signals which are determined by means of the measuring devices can be transmitted to a controller for controlling the throttle element.

An exhaust passage 53 includes: a first passage (high-speed passages 24b, 25b, and 26b); and a second passage (low-speed passages 24c, 25c, and 26c). A turbine housing 560 is connected to the exhaust passage 53 downstream from the collector 54. An exhaust device 100 of an engine 1 includes a valve (an exhaust variable valve 3) to open and close the first passage. A controller (an engine controller 7) closes the valve if an engine speed of the engine 1 is lower than a predetermined engine speed and opens the valve if the engine speed of the engine 1 is higher than or equal to the predetermined engine speed. The controller opens the valve even though the engine speed of the engine 1 is lower than the predetermined engine speed if performing the fuel cut control.