Mazda Motor Corporation

Shingo Kai

Keiji Araki

Hiroyuki Yamashita

Masatoshi Seto

Kazuaki Narahara

Kazuo Ichikawa

Hidefumi Fujimoto

Takashi Ikai

Tatsuya Tanaka

Yoshio Tanita

Susumu Masuyama

Yoshitomo Takahashi

Yusuke Nakao

Hirokazu Nakahashi

A direct injection engine includes an ignition assistance section applying energy to fuel injected into a cylinder using an injector to assist auto-ignition combustion of the fuel when the engine is within an auto-ignition combustion operation range. A start time of fuel injection is set within a period from a terminal stage of a compression stroke to a compression top dead center. The energy is applied to the fuel injected into the cylinder in a period from start of the fuel injection to an initial stage of an expansion stroke such that a time of a specific crank angle when an increase rate of in-cylinder pressure, which is a ratio of a change in the in-cylinder pressure to a change in a crank angle in motoring the engine, reaches a negative maximum value overlaps a combustion period when a combustion mass percentage of the fuel ranges from 10% to 90%.

Direct injection gasoline engine and method of controlling the direct injection gasoline engine

Growing community of inventors

Aki-gun, Japan

Shingo Kai