In recent years, further performance enhancement of supercharging systems has become
necessary in response to environmental regulations getting stricter. Major countries plan to make
regulations on CO2 emissions from automobile engines even stricter. In the sector of
turbochargers, development that can contribute to improvement in the thermal efficiency of engines
is required. We have developed the fundamental elements of a turbocharger including a turbine
with enhanced performance in the low-speed ratio region, a compressor with enhanced efficiency
in the vicinity of surging, and a bearing, for which mechanical loss was reduced by optimizing the
load, and supercharging systems including a VG turbocharger for gasoline engines and an electric
compressor. These developed elements and systems are supplied to automobile manufacturers as
samples.
