| 主权项 |
1. A supercharged internal combustion engine having
an intake system for supply of charge air, an exhaust-gas discharge system for discharge of exhaust gas, at least one exhaust-gas turbocharger which comprises a turbine arranged in the exhaust-gas discharge system and a compressor arranged in the intake system, the compressor being equipped with at least one impeller which is mounted on a rotatable shaft in a compressor housing, an exhaust-gas recirculation arrangement comprising a recirculation line system which branches off from the exhaust-gas discharge system downstream of the turbine of the at least one exhaust-gas turbocharger and which opens out into the intake system upstream of the at least one compressor impeller, and an additional exhaust-gas recirculation arrangement which comprises a line which branches off from the exhaust-gas discharge system upstream of the turbine and which opens out into the intake system again downstream of the compressor, wherein the recirculation line system comprises at least two annular ducts which surround the intake system in spiral form at least in sections upstream of the at least one compressor impeller, with multiple ducts extending from each annular duct, said ducts each being connected in terms of flow at an intake side, by way of an inlet opening, to the intake system, a first annular duct of the at least two annular ducts has ducts which, at least at the intake side, are oriented substantially radially with respect to the shaft of the compressor and thus, in a virtual elongation, intersect the shaft, and a second annular duct of the at least two annular ducts has ducts which, at least at the intake side, are oriented in the manner of a secant and thus, in a virtual elongation, run with a spacing to the shaft of the compressor. |
