Arrangement for an internal combustion engine having a plurality of cylinders and exhaust turbocharger, exhaust gas pressure transformer having a mixing tube and a wastegate, and method for operating and configuring such an arrangement

Abstract

The invention relates to an arrangement for an internal combustion engine (12) having a plurality of cylinders and an exhaust turbocharger, an exhaust gas pressure transformer (16), arranged between the internal combustion engine (12) and a turbine (14) of the exhaust turbocharger, and having a mixing tube (24) and a wastegate surrounding the turbine of the turbocharger for discharging exhaust gases without said exhaust gases flowing through the exhaust turbocharger. The problem addressed by the invention is in particular the providing of such an arrangement (10) by means of which the residual gas rate and the exhaust gas counter-pressure can be kept as low as possible over the entire speed range of an internal combustion engine (12). An arrangement (10) for an internal combustion engine (12) according to the invention, having a plurality of cylinders and an exhaust turbocharger, comprises an exhaust gas pressure transformer (16) arranged between the internal combustion engine (12) and a turbine (14) of the exhaust turbocharger and having a downstream mixing tube (24), and a wastegate (30) surrounding the turbine (14) of the exhaust turbocharger. The arrangement (10) has a first exhaust diverting section (20) for separate diverting of exhaust from a first partial volume of the cylinder to the mixing tube (24) and at least one second exhaust diverting section (22) for diverting exhaust from a second partial volume of the cylinder to the mixing tube (24), wherein there is one nozzle-like section each in the first exhaust diverting section (20) and in the second exhaust diverting section (22) in a respective end region (26) before the mixing tube (24), wherein there is a first bypass channel (32) circumventing the exhaust turbocharger from the first exhaust diverting section (20) before or in the nozzle-like section, wherein there is a second bypass channel (34) circumventing the exhaust turbocharger from the at least second exhaust diverting section (22) before or in the nozzle-like section, and wherein there is at least one control and/or regulating element (36) by means of which the flow volume through the first bypass channel (32) and/or through the second bypass channel (34) can be controlled or regulated.

Description

technical field [0001] The invention relates to an assembly for an internal combustion engine with a plurality of cylinders and an exhaust gas turbocharger, with a mixing tube arranged between the internal combustion engine and the turbine of the exhaust gas turbocharger and with a bypass turbocharger Exhaust gas pressure converter of the wastegate of the turbine of the turbocharger for discharging the exhaust gas without passing through the exhaust gas turbocharger. Background technique [0002] An exhaust gas pressure converter is currently understood in particular to mean the aggregation of at least two exhaust gas conduction sections in the region of the opening point into the mixing tube, where they meet in the exhaust gas conduction section The front is formed with a nozzle-shaped cross-sectional course (for example in the form of a continuous cross-sectional constriction) in order to accelerate the fluid flowing through the exhaust-gas-conducting sections before the e...

AI Technical Summary

Problems solved by technology

This in turn leads to an increased residual gas rate (Restgasrate) and, in the case of gasoline engines, to an increased knocking tendency (Klopfneigung) and a reduction in the efficiency of the internal combustion engine and the maximum torque of the internal combustion engine

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