System and method for variable tongue pitch of a multi-channel turbine for a supercharged internal combustion engine

Abstract

The present application discloses an internal combustion engine with a twin-flow turbocharger comprising a circular bracket having at least one tongue-like end, wherein the circular bracket is adjustable in translation along the turbine rotational axis. Moving this circular bracket affects the extent to which the separation behavior of the turbine channel is changed by changing the tongue spacing to the rotor.

Description

[0001] Cross reference to related applications [0002] This application claims priority from German Patent Application No. 102013213450.9 filed on July 9, 2013, the entire content of which is hereby incorporated by reference for all purposes. Background technique [0003] Turbocharged engines with multi-channel turbines contain walls that separate the channels up to the extent of the rotor in order to vary the interaction between the two channels. The twin-channel turbo is able to split the two airflows of the two cylinder exhaust banks, which helps boost low-end torque. The efficiency and separation characteristics of a twin-flow turbine are affected by the spacing between the tongues of the turbine housing wall and the turbine wheel. The engine can take into account the different spacing characteristics of the turbine under different operating conditions to increase efficiency. [0004] One solution is to provide a wall that separates the channels from each other up to th...

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Problems solved by technology

[0005] The inventors noted that one potential problem with the above solution is that providing wall elements with fixed positions only enables optimization of the engine under certain operating conditions

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