Supercharged internal combustion engine having two turbines, and method for operating an internal combustion engine of said type

摘要

Embodiments for a supercharged engine are presented. In one example, a supercharged engine includes a cylinder head having at least two cylinders, each cylinder having at least one outlet opening for discharging exhaust gases and each outlet opening being adjoined by an exhaust line, with exhaust lines of at least two cylinders merging to form an overall exhaust line within the cylinder head so as to form an integrated exhaust manifold, at least two turbines arranged in series, the two turbines being of different size and arranged downstream of the exhaust manifold in the overall exhaust line, a distributor housing in which the overall exhaust line downstream of the manifold enters into and leads through to a small turbine of the two turbines, and a first turbine housing which accommodates the small turbine including at least one coolant jacket in order to form a liquid cooling arrangement.

主权项

1. An engine system, comprising:
an exhaust manifold integrated in a cylinder head; a distributor housing fluidically coupled to the exhaust manifold and leading to a smaller first turbine and a larger second turbine, the first and second turbines arranged in series; a control element arranged in the distributor housing which, in an open position, opens up a bypass line bypassing the small turbine and which, in a closed position, blocks the bypass line, wherein the bypass line opens into an overall exhaust line upstream of the second turbine, and a second bypass line is provided which branches off from the overall exhaust line within the distributor housing and upstream of the second turbine, and wherein the first turbine is a water-cooled turbine and the second turbine is a non-water-cooled turbine.