Direct injection engine and controller for the same

• Main Authors: Nakayama, Yoko, Sukegawa, Yoshihiro, Shiraishi, Takuya, Kihara, Yusuke, Tsuchita, Kenji
• Format: Patent
• Language: English
• Published: 23.01.2007

A direct injection engine and a controller for the engine, which can realize super-retard combustion under high backpressure and can minimize an emission amount of HC at the startup. A cavity is formed in a piston such that fuel spray injected from a fuel injection valve is blown into the cavity. An obstacle member, such as a step, is provided in the cavity to decelerate or stop the fuel spray blown into the cavity. A mount position, mount posture, nozzle structure, injection port shape, etc. of the fuel injection valve are set such that the fuel spray injected from the fuel injection valve is made up of a lead fuel spray component directed toward the ignition plug and having a penetration to extend long beyond the ignition plug, and a main fuel spray component directed toward the piston, thereby enabling the super-retard combustion to be performed under high backpressure.