Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.

Takuya Kumagai

Hideho Narita

Motoi Kawashima

Ryuji Katayama

Masayuki Iizumi

Makoto Sakaguchi

Kazunori Sawazaki

Takayuki Yamamoto

Tomohide Yamada

Kazuki Nishizawa

The present invention suppresses leakage of combustion gas from a contact surface. A cylinder head () is attached to a cylinder block. The surface () of the side of the cylinder head () that is attached to the cylinder block includes a first region (AH) and a second region (AH) that has higher hardness than the first region (AH).

Cylinder head, cylinder block, internal combustion engine, and method for manufacturing cylinder head

An engine oil state control device for controlling a fuel mixture ratio of a fuel mixed in an engine oil of an engine on which a predetermined combustion control is performed includes comprising a fuel mixture ratio acquisition part configured to acquire the fuel mixture ratio, and an oil temperature rise control part configured to perform an oil temperature rise control for increasing an evaporation rate of the fuel mixed in the engine oil if the fuel mixture ratio is equal to or greater than a first threshold.

Engine oil state control device

Growing community of inventors

Tokyo, Japan

Takuya Kumagai