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Kabushiki Kaisha Toyota Chuo Kenkyusho

Minaji Inayoshi

Yoshihiro Hotta

Yoshihiro Nomura

Yoshifumi Wakisaka

Kiyomi Nakakita

Takayuki Fuyuto

Kazuhisa Inagaki

Kazuhiro Akihama

Hidemasa Kosaka

Ichiro Sakata

Shinya Iida

A state of combustion in a combustion chamber is controlled by stratifying an intake gas charge within the combustion chamber, so as to reduce amounts of harmful substances left in exhaust gas. A direct-injection type internal combustion engine in which a fuel is injected into the combustion chamber and which is arranged to stratify the intake gas charge within the combustion chamber ( ) such that intake gases of different compositions exist in a central portion ( ) of the combustion chamber including a position of the fuel injection, and in a peripheral portion of the combustion chamber, upon initiation of combustion of the fuel at a point of time near a terminal period of a compression stroke. The intake gases of different compositions may be intake gases having different concentrations of a specific component such as recirculated exhaust gas and the fuel.

Direct injection type internal combustion engine

A direct-injection diesel engine in which a shallow-dish type piston cavity is formed on a top surface of a piston; wherein in the vicinity of the top dead center, a squish area is defined mainly by the top surface of the piston and an inner surface of a cylinder head opposite the top surface; when a velocity of a reverse squish flow from the shallow-dish type piston cavity to the squish area, generated due to a movement of the piston and is represented by Vs, and a fuel spray velocity in the vicinity of a lip portion of the shallow-dish type piston cavity is represented by Vsp, the distance between opposite wall portions of the shallow-dish type piston cavity is set such that the ratio Vs/Vsp is not greater than 1.25; and the squish area constitutes a part of the combustion chamber.

Direct-injection diesel engine and combustion method for the same

Growing community of inventors

Aichi-gun, Japan

Minaji Inayoshi