Abstract: The present invention relates to a turbine arrangement driven by exhaust gases from a combustion engine. The turbine arrangement comprises a turbine housing, a turbine wheel rotatably arranged in the turbine housing, a first volute section defining a curved flow passage extending about 360° around the periphery of the turbine wheel, and an inner radial passage directing exhaust gases radially inwardly from the flow passage into a swept area of the turbine wheel. The curved flow passage has a cross section area decreasing continuously in the flow direction of the exhaust gases from an initial area at an initial angular position of the curved flow passage to an end angular position. The flow area decreases continuously with a successively reduced value from the initial angular position to an angular position located at least 270° from the initial angular position.

Abstract: A four stroke internal combustion engine is disclosed comprising at least one cylinder arrangement, an exhaust conduit, and at least one turbine. The cylinder arrangement comprises an exhaust port arrangement configured to open and close an exhaust flow area, ACYL. The cylinder arrangement has a maximum volume, VMAX. The exhaust conduit extends between the exhaust flow area, ACYL, and a turbine wheel inlet area, ATIN, of the turbine and has an exhaust conduit volume, VEXH that is ?0.5 times the maximum volume, VMAX. The exhaust port arrangement is configured to expose the exhaust flow area, ACYL, at a size of at least 0.22 times the maximum volume, VMAX, when a piston of the cylinder arrangement is at the bottom dead centre, BDC.

Abstract: The present invention relates to a turbine arrangement driven by exhaust gases from a combustion engine. The turbine arrangement comprises a turbine housing, a turbine wheel rotatably arranged in the turbine housing, a first volute section defining a curved flow passage extending about 360° around the periphery of the turbine wheel, and an inner radial passage directing exhaust gases radially inwardly from the flow passage into a swept area of the turbine wheel. The curved flow passage has a cross section area decreasing continuously in the flow direction of the exhaust gases from an initial area at an initial angular position of the curved flow passage to an end angular position. The flow area decreases continuously with a successively reduced value from the initial angular position to an angular position located at least 270° from the initial angular position.

Abstract: A four stroke internal combustion engine is disclosed comprising at least one cylinder arrangement, an exhaust conduit, and at least one turbine. The cylinder arrangement comprises an exhaust port arrangement configured to open and close an exhaust flow area, ACYL. The cylinder arrangement has a maximum volume, VMAX. The exhaust conduit extends between the exhaust flow area, ACYL, and a turbine wheel inlet area, ATIN, of the turbine and has an exhaust conduit volume, VEXH that is ?0.5 times the maximum volume, VMAX. The exhaust port arrangement is configured to expose the exhaust flow area, ACYL, at a size of at least 0.22 times the maximum volume, VMAX, when a piston of the cylinder arrangement is at the bottom dead centre, BDC.

Abstract: Device for injecting air into an exhaust system fitted with catalytic cleaner for a supercharged Otto engine, in whose intake manifold is incorporated a motor driven air compressor operating with internal compression, giving rise to the supercharging. An air bleeding duct is arranged for adjustable air bleeding from the constriction zone of the air compressor to supply this air as additional air to the catalytic cleaner. This air bleeding duct extends from a point in the constriction zone to a point in the exhaust system upstream from the catalytic cleaner. In an inlet section of the intake manifold, located upstream from the compressor, is installed an electronically controlled device for engine idle control during bleeding of the air via the air bleeding duct.