Volvo Lastvagnar Ab

Volvo Truck Corporation

Sebastian Krausche

Lars Sundin

Kent Giselmo

Magnus Ising

Ulrich Gobert

Per Andersson

Daniel Grunditz

Martin Bauer

Magnus Ekstrand

The invention relates to a method of controlling transient behaviour of an internal combustion engine () being provided with a turbocharger () and a variable inlet guide vanes assembly () arranged upstream a compressor () of the turbocharger (). The method comprises determining a current operational condition indicative of transient behaviour, and, if said transient behaviour requires compressor acceleration: determining a desired operational condition of the compressor (), and controlling the position of the variable inlet guide vanes assembly () based on the desired operational condition of the compressor ().

Method and vehicle system using such method

The invention relates to a method for a vehicle system () comprising an internal combustion engine () having a turbocharger unit () connected thereto, a turbocompound unit () arranged to receive exhaust gas flowing from the turbocharger unit (), and an exhaust gas recirculation system (). The method comprises controlling the exhaust gas flowing through the exhaust gas recirculation system () by determining a pressure difference, and, if the determined pressure difference is above a predetermined threshold value directing the recirculated exhaust gas to an air intake line () downstream a charge air cooler (), and, if the determined pressure difference is not above the predetermined threshold value directing the recirculated exhaust gas to a compressor () of the turbocharger unit ().

Vehicle system and a method for such vehicle system

The invention relates to a method of controlling engine derating of an internal combustion engine () being provided with a turbocharger () and a variable inlet guide vanes assembly () arranged upstream a compressor () of the turbocharger (). The method comprises determining a current operational condition requiring engine derating, detecting a current operational condition of the compressor (), and controlling the position of the variable inlet guide vanes assembly () based on the detected operational condition of the compressor ().

Method and system for controlling engine derating

A device for controlling a gas flow through a passage includes a plurality of pivotable gas flow control vanes. The pivot axes of a first and a second adjacent vane are spaced so that a trailing edge of the first vane overlaps a leading edge of the second vane when the first and second adjacent vanes are positioned in a first mutual end state for substantially restricting the gas flow through the passage. The second vane includes a recess with such a shape that the trailing edge of the first vane is at least partly received in the recess when the first and second adjacent vanes are positioned in the first mutual end state.

Device for controlling a gas flow, an exhaust aftertreatment system and a system for propelling a vehicle

A power turbine unit includes a turbine housing, an exhaust duct, a turbine wheel with blades positioned in the exhaust duct, a shaft rigidly connected to the turbine wheel and rotatably supported in the housing, and an oil sealing system. The oil sealing system includes a sealing arrangement positioned in the vicinity of the turbine wheel for preventing oil from escaping from the turbine housing along the shaft to the exhaust duct. The oil sealing system further includes a buffer gas duct that is arranged to supply exhaust gas from the exhaust duct to the sealing arrangement for pressurizing the sealing arrangement.

Pressurized seal system for a power turbine unit

A turbocharger unit () for an internal combustion engine () with at least one exhaust line () for conducting exhaust gases away from the combustion chamber () of the engine and at least one inlet line () for supplying air to the combustion chamber. The turbocharger unit includes a turbine () which interacts with a compressor () for extracting energy from the exhaust gas flow of the engine and pressurizing the inlet air of the engine. The compressor () is of radial type and provided with an impeller with backswept blades () where the blade angle (&#x3b2;) between an imaginary extension of the center line of the blade between root section and tip section in the direction of the outlet tangent and a line () which connects the center axis of the impeller to the outer tip of the blade is at least roughly 45&#xb0;. The turbine () which drives the compressor () is of radial type.

Turbo compressor system for an internal combustion engine comprising a compressor of radial type and provided with an impeller with backswept blades

A turbocharger system for an internal combustion engine having at least one exhaust line for evacuating exhaust gases from the combustion chamber of the engine and at least on inlet line for supplying air to the combustion chamber. A high-pressure turbine interacts with a high-pressure compressor and a low-pressure turbine interacts with a low-pressure compressor to extract energy from the exhaust flow of the engine and pressurize the inlet air of the engine. Both compressor stages are of the radial type and are provided with compressor wheels having backswept blades, in which a blade angle between an imaginary extension of the blade along the centerline between root section and tip section in the direction of the outlet tangent and a line connecting the center axis of the compressor wheel to the outer point of the blade, is at least about 40 degrees.

Turbochanger system for internal combustion engine comprising two compressor stages of the radial type provided with compressor wheels having backswept blades

A piston engine and a method for controlling a diesel-type piston engine including at least one combustion chamber formed by a cylinder, a movably arranged piston in each cylinder, which piston is connected to a crankshaft, an injection device designed to inject fuel directly into the combustion chamber and turbo system comprising a low pressure turbo and a high pressure turbo. The thermal efficiency of the internal combustion is increased while requirements relating to nitrogen oxide and soot particle emissions continue to be maintained.

Turbo charged diesel-type piston engine and method for controlling such an engine

A turbocharger system for an internal combustion engine having at least one exhaust line for evacuating exhaust gases from the combustion chamber of the engine and at least one inlet line for supplying air to the combustion chamber. A high-pressure turbine interacts with a high-pressure compressor forming a high-pressure turbo unit with a common rotation axis. A low-pressure turbine interacts with a low-pressure compressor forming a low-pressure turbo unit with a common rotation axis. The high-pressure turbo unit and the low-pressure turbo unit are serially placed with the rotation axes essentially concentric and with the high-pressure turbine and the low-pressure turbine placed adjacent to each other and coupled together by an intermediate piece configured as a flow duct. The low-pressure turbo unit () is attached to one part of the internal combustion engine, while the high-pressure turbo unit is attached to another part of the engine.

Growing community of inventors

Höllviken, Sweden

Sebastian Krausche