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AssigneeDaimler A G
InventorsStephan Krätschmer, Wolfram Schmid, Wolfgang Sladek, Siegfried Sumser
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In an internal combustion engine comprising an exhaust gas turbocharger, which includes a compressor with a compressor wheel arranged in an inlet tract of the internal combustion engine and a turbine with a turbine wheel coupled rotationally to the compressor wheel and arranged in an at least two-path exhaust gas tract of which is connected to an exhaust gas guide section of the turbine including at least a first spiral channel coupled to the first exhaust path and a second spiral channel coupled to a second exhaust gas path, two guide vane elements are arranged upstream of the turbine wheel and downstream of respective spiral channels which are formed corresponding to a first degree of asymmetry A1 determined as a quotient Θ of a first mass flow parameter and a second mass flow parameter which is between 0.4 and 0.8.
An internal combustion engine (10) for a motor vehicle, comprising a combustion air inlet tract (16), an at least double path exhaust gas discharge tract (24), an exhaust gas turbocharger (12), which has a compressor wheel (18), arranged in the combustion air inlet tract (16) of the internal combustion engine (10) and a turbine wheel (22) coupled to the compressor wheel (18) in a rotationally fixed manner and being arranged in the exhaust gas discharge tract (24) of the internal combustion engine (10), the exhaust gas turbine (22) having a housing (28) with an exhaust gas guide section (26) including at least a first spiral channel (30a) coupled to a first exhaust gas path (24a) of the exhaust gas tract (24) through which exhaust gas can be independently conducted, a flow control device (32) arranged upstream of the exhaust gas guide section (26), by means of which the exhaust gas guide section (26) can be bypassed, and first and second guide vane elements (42a, 42b) arranged upstream of the turbine wheel (22) and downstream of the first and respectively second spiral channels (30a, 30b) in the exhaust gas guide section (26), the first and the second guide vane element (42a, 42b) being formed with a first degree of asymmetry (A1), which can be determined as a quotient of a first critical mass flow parameter (Θ42a) and a second critical mass flow parameter (Θ42b) and which has a value between 0.4 and 0.8.
A method for controlling an internal combustion engine (10), for a motor vehicle, including an inlet tract (16) and an exhaust tract (24), an exhaust gas turbocharger (12), with a compressor wheel (18) arranged in the inlet tract (16) and a turbine including a turbine wheel (22) coupled in a rotationally fixed manner to the compressor wheel (18) and arranged in the exhaust tract (24), the turbine having a housing (28) with at least a double passage exhaust gas path (24) formed in an exhaust gas guide section (26) of the housing (28) of the exhaust gas turbine (22) with at least a first spiral channel (30a) coupled to a first exhaust gas path (24a) and a second spiral channel (30b) coupled to a second exhaust gas path (24b) of the exhaust gas tract (24), through which exhaust gas is conducted to the spiral channels (30a, 30b);
Dependencies are inferred from the claim text.