| 摘要 |
PROBLEM TO BE SOLVED: To ensure engine output when using hydrogen fuel while suppressing knocking when using gasoline in a low rotation area (a2) where a supercharging effect is not sufficiently expected, in a dual-fuel engine 1 including a supercharger 20 supercharging intake air and selectively using the gasoline and hydrogen fuel. SOLUTION: On a high-load side (b1) when the gasoline is used in the low rotation area of the engine 1, the effective compression ratio of an operation chamber is reduced by a Miller cycle or the like, thereby suppressing the knocking. Meanwhile, on a low-load side (b2), the effective compression ratio is relatively increased, thereby ensuring ignitability of an air-fuel mixture and combustion stability. When the hydrogen fuel is used, the effective compression ratio is relatively increased in the whole area of the low rotation area (a2) where the supercharging effect is not expected, thereby ensuring the engine output. COPYRIGHT: (C)2011,JPO&INPIT
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