| 摘要 |
PROBLEM TO BE SOLVED: To improve uniformization of an air-fuel mixture in uniform combustion, while maintaining iginitability by the mutual interference effect between fuel atomization in stratified combustion. SOLUTION: This spark-ignition direct-injection engine has a fuel injection timing control means for setting the fuel injection timing to a compression stroke in the stratified combustion, and to an intake stroke in homogeneous combustion, by pointing the injection direction of fuel injected from a fuel injection valve 18, to the electrode vicinity of a spark plug 16. The fuel injection valve 18 is provided with an electrode lower side nozzle port having the axis pointing to a space in close vicinity to an under surface of an electrode of the spark plug 16, and a piston side nozzle port having the axis pointing to a space under the electrode lower side nozzle port, when looking at the tip side in the fuel injection direction from at least the fuel injection valve side. Arrangement of both nozzle ports is constituted so that an opening angle between the axes of both nozzle ports becomes larger than an atomization angle in the stratified combustion, in the relationship between the opening angle between the axes of both nozzle ports and the atomization angle of the fuel injected from both nozzle ports. COPYRIGHT: (C)2005,JPO&NCIPI |
