Vol. 54 No. 1 (2017)   M-FET
Technical Papers

Development of Automotive Turbochargers Contribute to Environmental Load Reduction

MAKOTO OZAKI
MOTOKI EBISU
YOSUKE DANMOTO
YOUJI AKIYAMA
TAKAO YOKOYAMA
TADASHI KANZAKA

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.