Mitsubishi Heavy Industries Technical Review
    Vol. 53 No. 3 (2016)   Commercial Aviation & Transportation Systems
    Technical Papers
    Development of Variable Geometry Turbocharger Contributes to Improvement of Gasoline Engine Fuel Economy
    MOTOKI EBISU
    YOSUKE DANMOTO
    YOJI AKIYAMA
    HIROYUKI ARIMIZU
    KEIGO SAKAMOTO
    Every company in the automotive industry has been researching methods to enhance the thermal efficiency of gasoline engines such as Miller cycle technology, EGR technology, and lean burn technology. To apply these technologies, further improvement in supercharging efficiency is required and the adoption of a variable geometry turbocharger is being considered. Because the exhaust gas temperature of a gasoline engine is higher than that of a diesel engine, however, it is necessary to significantly enhance the durability of high-temperature components including the variable mechanism. Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. developed a variable geometry turbocharger for gasoline engines that has sufficient durability at an exhaust gas temperature of 950°C and started supplying prototypes to automobile manufacturers.

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