To prevent knocking from occurring due to a difference in temperature between an intake side and an exhaust side in a combustion chamber in a three-point igniting internal combustion engine.
In this internal combustion engine 1, a first ignition plug 11 is installed in the center area of the combustion chamber, and second and third ignition plugs 12, 13 are arranged in the peripheral areas of the combustion chamber on both sides of the intake and exhaust valves which are generally symmetric with respect to the first ignition plug 11. The internal combustion engine comprises a swirl generating means 23. When the area of the combustion chamber where the intake valve 6 is disposed and the area thereof where the exhaust valve 7 is disposed on the line extending through the ignition plugs 11 to 13 are defined as an intake side area and an exhaust side area, respectively, the swirl generating means can generate swirl flow from the intake side area toward the exhaust side area near the second ignition plug 12 and from the exhaust side area toward the intake side area near the third ignition plug 13. At least in the operating state of generating the swirl flow, the third ignition plug 13 is ignited before the first and second ignition plugs 11, 12 are ignited.
COPYRIGHT: (C)2008,JPO&INPIT
NISHIZAWA MASAYOSHI
Masahiro Fujii
Yasunari Mita
Masaaki Iida
Next Patent: EVAPORATED FUEL TREATING DEVICE