To appropriately distribute the octane number of fuel in a combustion chamber according to an engine operating condition.
A piston crown surface is formed with a projection 13 having a ridge line 14 extending in the direction perpendicular to the direction with an intake valve 5 and an exhaust valve 7 arranged. A fuel injection valve 11 for high octane number fuel injects fuel obliquely downward from the side of the intake valve toward the side of the exhaust valve, and a fuel injection valve 12 for low octane number fuel injects fuel obliquely downward from the side of the exhaust valve toward the side of the intake valve. Each of the fuel injection valves 11, 12 is so configured that in early-stage injection, injected fuel flies to a region on a side opposite to a side with the injection valves arranged beyond the ridge line 14 and in late-stage injection, fuel is injected toward a region on a side with the fuel injection valves arranged. Therefore, fuel having an appropriate concentration and an appropriate octane number can be distributed to each of a region Rint on the side of the intake valve and a region Rexh on the side of the exhaust valve across the projection 13 by controlling the injection quantity and injection timing of each of the injection valves 11, 12 according to the engine operating condition.
COPYRIGHT: (C)2010,JPO&INPIT
Takashi Shinshiro
Koichi Ashida
Atsushi Terachi
| JP2005139945A | ||||
| JP2008180108A | ||||
| JP2007231913A | ||||
| JP2004197597A | ||||
| JP2000179368A |
Hiromichi Kobayashi
Tomioka Kiyoshi
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