Embodiments are directed to boosting aircraft engine performance for takeoff and critical mission segments by reducing airflow used for cooling exhaust gases. The airflow is reduced by stopping an accessory blower or by closing an external air vent Eliminating the cooling airflow to the exhaust has the effect of lowering the backpressure on the engine, which thereby increases maximum engine power.

An internal combustion engine and method for simultaneously regulating the exhaust gas temperature and the charge pressure of an internal combustion engine. An internal combustion engine that includes: an exhaust gas turbocharger (17) including a turbine (19) that is situated in an exhaust duct (8), and including a compressor (18) that is situated in an intake duct (4); a bypass valve (13) via which at least a portion of an exhaust gas mass flow of the internal combustion engine may be led past the turbine (19); and an exhaust gas flap (15) that is situated in the exhaust duct (8), downstream from the turbine (19) and the bypass valve (13).

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.

Methods and systems for operating an engine with an electrically heated catalyst and an electrically driven compressor are described. In one example, the electrically driven compressor and the electrically heated catalyst are activated before an engine start so that vehicle emissions may be reduced more efficiently at engine starting and thereafter.

Methods and systems are provided for controlling imbalance with an exhaust tuning valve. In one example, a method may include adjusting a first exhaust tuning valve in response to combustion torque imbalance in a first and second group of cylinders. Additionally or alternatively, the position of the second exhaust tuning valve may be adjusted in response to an imbalance generated by the same group of cylinders.

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.

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.

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.

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.

Systems, methods and apparatus are disclosed for producing a target pressure differential across an intake air throttle of an internal combustion engine by opening or closing a turbocharger wastegate to a commanded position that provides an opening through the wastegate having an effective area based on the target pressure differential.