Cylinder injection engine and fuel injection nozzle used for the engine

• Main Authors: Sukegawa, Yoshihiro, Nogi, Toshiharu, Shiraishi, Takuya, Nakayama, Yoko, Kihara, Yusuke, Tokuyasu, Noboru
• Format: Patent
• Language: English
• Published: 20.04.2004

The present invention relates to a direct injection engine and a combustion method for the engine, and particularly to a direct injection engine for direct injection of fuel into the combustion chamber forming a tumble air flow and the combustion method for this engine. A fuel injector employed in a direct injection engine comprising a spark plug arranged on the top of a combustion chamber, a fuel injector located on said combustion chamber and an intake air control means installed on an intake manifold. A forward tumble air flow is formed in the combustion chamber by the intake air control means, and the fuel injector is available in two types; an annular (conical) spray type characterized by uniform density and a spray type characterized by high/low density. In the case of latter type, arrangement is made to ensure that the denser portion is placed face-to-face with the spark plug. Spray fuel rises along the wall surface of the combustion chamber on the intake side, and is carried to the spark plug by forward tumble air flow (called "tumble guide") moving from the fuel injector to the spark plug. This allows stratified charge combustion to be performed in the operation range from low to high speed ranges, with the result that discharge of gas containing hazardous gas component such as THC is reduced and fuel economy is improved.