The ultra-lean combustion gasoline engine is expected to achieve high thermal efficiency, but to further improve the thermal efficiency, it is necessary to suppress knocking in the high-load area and reduce cooling loss. A few days ago, the Japanese research team successfully applied the in-cylinder water injection technology to the ultra-lean combustion gasoline engine with an excess air coefficient of about 2, and optimized the various conditions to eventually increase the compression ratio to 17, and successfully successfully used The thermal efficiency has increased from about 40% to 51.5%, indicating that the thermal efficiency has increased to 52.6%, achieving the highest level of thermal efficiency in the world.

The results show that by spraying water near the piston surface in the combustion chamber to form a low-temperature water vapor layer, even ultra-lean combustion can suppress knocking and reduce cooling loss while avoiding deterioration of combustion performance.

The research was developed in collaboration with Professor Yoshinori Shoji, Assistant Professor Nagasawa Gang, and Associate Professor Satojin, etc., in collaboration with Professor Kei Iida of Keio University and Associate Professor Yoko Mori . Relevant research results are published in "International Journal of Engine Research" with the title "".

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