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.
