Patent ID: 8209982
Filing Date: 2012-07-03
Classification: F01D,F02B,F05D

Abstract:
1. An internal combustion engine ( 1 ) including an intake tract ( 7 ) and one exhaust tract ( 8 ), a first turbocharger ( 2 ) arranged near the engine ( 1 ) and a second turbocharger ( 3 ) arranged remote from the engine ( 1 ), each including an exhaust gas turbine ( 4 , 9 ) arranged in series in the exhaust tract ( 8 ) and a compressor ( 10 , 5 ) arranged in series in the intake tract ( 7 ), a by-pass line ( 18 ) extending from the exhaust tract ( 8 ) upstream of the turbine ( 4 ) of the first turbocharger ( 2 ) to the turbine ( 9 ) of the second turbocharger ( 3 ), said second turbocharger turbine ( 9 ) including a turbine wheel ( 24 ), a first exhaust gas channel ( 23 ) for directing exhaust gas to the turbine wheel ( 24 ) from the first turbocharger turbine ( 4 ) and a second exhaust gas channel ( 26 ) connected to the bypass line ( 18 ) and having an opening area ( 29 ) for conducting exhaust gas to the second exhaust gas turbocharger turbine wheel ( 24 ), and a blow-off valve ( 19 ) integrated into the second exhaust gas turbocharger turbine ( 9 ) and including an adjustable control sleeve ( 27 ) arranged in the turbine housing so as to be movable into, and out of, the opening area ( 29 ) for controlling the exhaust gas flow through the bypass line ( 18 ) to the turbine wheel ( 24 ), the adjustable control sleeve ( 27 ) being movable between a fully inserted position In which the opening area ( 29 ) is closed so as to block any exhaust gas flow through the by-pass line ( 18 ) to the second turbocharger turbine ( 9 ), an intermediate position, in which the opening area ( 29 ) is at least partially open for controlling the exhaust gas flow volume through the by-pass line ( 18 ) to the turbine ( 9 ) of the second turbocharger ( 3 ) around the turbine ( 4 ) of the first turbocharger ( 2 ) and a fully retracted position in which the control sleeve ( 27 ) is axially spaced from the opening area ( 29 ) so as to provide for a flow path through the by-pass line ( 18 ) to an outlet ( 34 ) of the turbine ( 9 ) of the second turbocharger ( 3 ) by-passing the turbine ( 4 ) of the first turbocharger ( 2 ) and the turbine wheel ( 24 ) of the turbine ( 9 ) of the second turbocharger ( 3 ).