| 摘要 |
PROBLEM TO BE SOLVED: To provide a spark ignition type natural gas internal combustion engine provided with no throttle valve and control a load by an injection amount and to improve fuel consumption in a low load area. SOLUTION: This internal combustion engine comprises a main fuel injection valve 11 to inject natural gas in the cavity combustion chamber 14 of a piston 7; an auxiliary fuel injection valve 12 to inject natural gas to an ignition chamber 9; and an ignition plug 10 situated at the ignition chamber 9. Since, during idling, fuel is fed only from the auxiliary injection valve 12 and ignited and burnt in the ignition chamber 9, stable operation at a high excess air factor is practicable. At a partial load area, fuel is injected from the main fuel injection valve 11, and before fuel is excessively diffused in a cavity combustion chamber 14, flame generated due to combustion in the ignition chamber 9 is injected through a communication hole 13 for ignition and combustion. At a total load area, fuel is injected from the main fuel injection valve 11 in the vicinity of a bottom dead center and brought into a state approximately equal to premixture.
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