| abstract |
A diesel engine using a low evaporativity fuel, and improves the fluidity of the air and fuel by injecting the fuel into a cylinder at the beginning of a compression stroke forming a uniform gaseous mixture, whereby the generation of NO x is minimized. A swirl chamber is formed in a piston, and a primary chamber by a combustion chamber structure provided in a cavity of a cylinder head. A fuel injection nozzle injects a low evaporativity fuel, such as heavy oil, into the cylinder at the beginning of a compression stroke, disperses the fuel into an air swirl in the cylinder, forms a uniform gaseous mixture of the fuel and air therein, and ignites and burns with the assistance of a glow plug the gaseous mixture entering the swirl chamber through communication ports at the end of the compression stroke. In another embodiment, the piston is provided with a plurality of radially arranged communication ports and a downwardly convergent fuel injection port, and a fuel injection nozzle injects a low evaporativity fuel into a cylinder at the beginning of a compression stroke, disperses the fuel into an air swirl in the cylinder, forms a uniform gaseous mixture of the fuel and air in the cylinder, and ignites and burns the gaseous mixture in the swirl chamber by reliably supplying an ignition fuel thereto through the fuel injection port at the terminal end of the compression stroke. |