Vol. 52 No. 1 (2015)   New Products & Technologies
Technical Papers

Energy Savings through Electric-assist Turbocharger for Marine Diesel Engines

KEIICHI SHIRAISHI
YOSHIHISA ONO
YUKIO YAMASHITA
MUSASHI SAKAMOTO

The extremely slow steaming of ships has become the mainstream on the back of the recent energy-saving trend. Turbochargers (super chargers) for marine diesel engines are generally driven only by exhaust gas energy. Mitsubishi Heavy Industries Marine Machinery & Engine Co., Ltd. has developed an electric-assist system for large turbocharger for marine diesel engines, and verified high energy saving advantages in the low-load operating range of the engine. This paper reports the effect of an electric-assist system for turbocharger rotors with test results in two- and four-stroke engines.