Turbocharging of Downsized Gasoline DI Engines with 2 and 3 Cylinders 2011-24-0138
Turbocharged DISI engines with four cylinders have established
in the market and provide a performance comparable to larger
six-cylinder engines in the smaller compartment of a four-cylinder
engine. In the Japanese market, also turbo gasoline engines with
500 - 660 cm₃ displacement have a long tradition in Kei-Cars.
However, those engines show a lower specific performance as would
be required for propelling typical small or compact vehicles in
Europe. Recently, two-cylinder turbo engines have come to market,
which are found attractive with respect to sound, package, and also
enable low vehicle fuel consumption in NEDC test.
The paper presents a turbocharger layout study on 2- and
3-cylinder engines. It discusses the influence of cylinder
displacement volume on the sizing of turbines and compressors, and
how specific flow phenomena in the turbine can be captured in the