To realize improvement of a problem accompanying with pilot injection while realizing reduction of combustion noise by the pilot injection in a compression ignition internal combustion engine for performing the pilot injection.
The compression ignition internal combustion engine for performing the pilot injection is provided with a first fuel injection valve 3 formed by an axial symmetry cavity 14 in which a part of a combustion chamber has an axial symmetry cross section relative to a predetermined axis L1 and further injecting a fuel into the combustion chamber at a radial shape approximately making a position on the predetermined axis L1 as a center; and a second fuel injection valve 9 for injecting the fuel in a normal direction of swirl in the combustion chamber along an inner wall surface of a cylinder. Two injection of the first pilot injection and the second pilot injection are performed at an earlier timing than main injection as the pilot injection, the first pilot injection is performed from the first fuel injection valve 3, the second pilot injection is performed from the second fuel injection valve 9 and the main injection is performed from the first fuel injection valve 3.
COPYRIGHT: (C)2006,JPO&NCIPI
Yasuo Sato
High Hideyuki Ki
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Hidemi Matsukura
Mayuko Wakuda
Kazunobu Sera
Tsutomu Toyama