A method of operating an internal combustion engine, wherein the internal combustion engine has at least one combustion engine, a fresh gas line, and a compressor integrated in the gas line, which is associated with a trim controller, via which an edge-side portion of the inlet cross section of a compressor impeller of the compressor is coverable to a variable extent. In this case, in a release position of the trim controller, the edge-side portion of the inlet cross section is covered relatively little, and in a covering position of the trim controller, is mostly covered. It is provided that in a transition from a traction mode of the combustion engine, in which the trim controller is in the release position, the trim controller is adjusted to an overrun mode of the combustion engine into the covering position. As a result, a so-called discharge hissing can be prevented or minimized.

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.

A vehicle fuel system includes a turbocharger having a compressor disposed on an intake line of an engine. The compressor selectively compresses intake air supplied to the engine. The fuel system has a canister configured to capture fuel vapor discharged from a fuel tank and a purge control valve configured to open or close the purge line depending on a pressure of the intake line. The fuel system has a check valve provided on the purge line that blocks movement of a fluid from the intake line to the canister. The fuel system has a controller performing control such that the purge control valve is operated in a closed mode to prevent intake air in the intake line from being introduced into the fuel tank when breakdown of the check valve is sensed during driving of the vehicle.

Methods and systems are provided for adjusting an active casing treatment of a compressor responsive to a predicted engine condition. In one arrangement, a controller may actuate a sleeve of a variable geometry compressor casing to a position selected based on each of a compressor pressure ratio and a mass flow through the compressor, as well as driver behavior and predicted road conditions; and adjust each of an EGR actuator and a boost actuator based on the selected position to maintain the compressor pressure ratio during the actuating.

A supercharging device (20), having: a housing (21) which has a longitudinal axis (L); at least one housing inlet (1) which leads into the housing (21); at least one housing outlet (2) which leads out of the housing (21); at least one compressor wheel (5) which is arranged in a compressor chamber (15) and which is driven by a motor shaft (16) and which is arranged between the housing inlet (1) and the housing outlet (2) of the housing (21) as viewed in the flow direction, and at least one bypass duct (17) which is integrated in the housing (21) and which connects the housing inlet (1) to the housing outlet (2) so as to bypass the compressor chamber (15). The bypass duct (17) has a self-adjusting valve (22). The housing inlet (1) and the housing outlet (2) are formed as an axial inlet and an axial outlet respectively.

Methods and systems are provided for controlling boost pressure in a staged engine system comprising a turbocharger and an upstream electric supercharger. In one example, a method may include accelerating an electric supercharger to choke the flow of air to the engine in the event of turbocharger overboost.

Methods and systems for operating an engine that includes four compressors for two cylinder banks are described. In one example, output of two compressors and positions of valves are adjusted responsive to an engine air flow amount to prevent air from back flowing through a compressor. Output from the two compressors may be combined for higher engine air flow amounts.

An engine includes an exhaust gas control apparatus that is configured to store NOx and react NOx with a reduction agent. A control device for the engine includes an electronic control unit. The electronic control unit is configured to: (i) execute a rich spike control, the rich spike control is a control executed to temporarily change an in-cylinder air-fuel ratio from a leaner air-fuel ratio than the stoichiometric air-fuel ratio to the stoichiometric air-fuel ratio or a richer air-fuel ratio than the stoichiometric air-fuel ratio, and (ii) vary an overlap amount of an intake valve and an exhaust valve such that the overlap amount is less during execution of the rich spike control than during non-execution of the rich spike control, in an operation range where a pressure of the intake port becomes higher than a pressure of the exhaust port.

Turbine housing assemblies and related turbocharger systems are provided. One exemplary turbine housing assembly includes a bypass valve assembly structure including a guide portion, an inner sheet metal shell including an inner inlet portion and a volute portion providing an outer contour of a volute, wherein an end of the inner inlet portion is surrounded by the guide portion and spaced apart from the bypass valve assembly structure, and an outer sheet metal shell radially surrounding at least a portion of the volute portion and including an outer inlet portion surrounding the inner inlet portion and contacting the guide portion of the bypass valve assembly structure.

An internal combustion engine with an open-loop or closed-loop control device (2), wherein at least one combustion chamber (3) of the internal combustion engine (1) is designed to burn a fuel-air mixture using at least one combustion parameters that can be influenced by the open-loop or closed-loop control device (2), wherein the open-loop or closed-loop control device (2) has an emission control loop that is configured to actuate the at least one actuator that influences the at least one combustion parameter as a substitute parameter for NOx emissions by means of a functional relationship in such way that at last one combustion parameter can be set for each target or actual power rating of the internal combustion engine (1), wherein the functional relationship takes account of an influence of a change of the exhaust backpressure (p.sub.3) affecting at least one combustion chamber (3).